阅读说明：本技术 一种超深井套管智能刮壁器 (Intelligent wall scraper for casing of ultra-deep well ) 是由 邓宽海 彭阳 林元华 刘婉颖 谢鹏飞 刘冰 于 2021-03-11 设计创作，主要内容包括：一种超深井套管智能刮壁器,其特征在于,主要包括：第一刮刀组、第一组鱼鳞式刮刀片、第一承压腔室、第一低密度钢球、第一球座、第一刮壁器、第二刮刀组、第二组鱼鳞式刮刀片、第二承压腔室、第二低密度钢球、第二球座、第二刮壁器、第三刮刀组、第三组鱼鳞式刮刀片、第三承压腔室、第三低密度钢球、第三球座、第三刮壁器；第一组鱼鳞式刮刀片、第二组鱼鳞式刮刀片、第三组鱼鳞式刮刀片三者间相位角为60°,第一低密度钢球、第二低密度钢球和第三低密度钢球外径依次减小,通过向套管内投入不同外径低密度钢球打开任意刮刀组,实现超深井多井段、多井径内套管非旋转式360°无死角的智能刮壁作业。本发明适用于超深复杂油气井钻完井工程技术领域。(The utility model provides an ultra-deep well casing intelligence wall scraping device which characterized in that mainly includes: the device comprises a first scraper set, a first group of fish scale type scraper blades, a first pressure-bearing chamber, a first low-density steel ball, a first ball seat, a first wall scraper, a second scraper set, a second group of fish scale type scraper blades, a second pressure-bearing chamber, a second low-density steel ball, a second ball seat, a second wall scraper, a third scraper set, a third group of fish scale type scraper blades, a third pressure-bearing chamber, a third low-density steel ball, a third ball seat and a third wall scraper; the phase angle between the first group of scale type scraper blades, the second group of scale type scraper blades and the third group of scale type scraper blades is 60 degrees, the outer diameters of the first low-density steel ball, the second low-density steel ball and the third low-density steel ball are sequentially reduced, and any scraper group is opened by putting different outer-diameter low-density steel balls into the sleeve, so that the intelligent wall scraping operation of 360-degree non-rotation type dead angles in the multi-well section and multi-well diameter inner sleeve of the ultra-deep well is realized. The invention is suitable for the technical field of ultra-deep complex oil and gas well drilling and completion engineering.)

1. The utility model provides an ultra-deep well casing intelligence wall scraping device which characterized in that mainly includes: the scraper comprises a first upper joint (1), a first shearing pin (5), a first scraper group (6), a first group of scale-type scraper blades (7), a first pressure-bearing chamber (9), a first double-female conversion joint (13), a first low-density steel ball (16), a first ball seat (17), a first shearing pin (18), a first sliding sleeve (20), a first wall scraper (22), a second upper joint (23), a second shearing pin (27), a second scraper group (28), a second group of scale-type scraper blades (29), a second pressure-bearing chamber (31), a second double-female conversion joint (35), a second low-density steel ball (38), a second ball seat (39), a second shearing pin (40), a second sliding sleeve (42), a second wall scraper (44), a third upper joint (45), a third shearing pin (49), a third scraper group (50), a third group of scale-type scraper blades (51), a third pressure-bearing chamber (53), A third double-female conversion joint (57), a third male buckle (58), a third low-density steel ball (60), a third shear pin (61), a third ball seat (63), a third sliding sleeve (64) and a third wall scraper (66); the ultra-deep well casing intelligent wall scraper consists of a first wall scraper (22), a second wall scraper (44) and a third wall scraper (66), wherein the first wall scraper (22) is connected with an upper pipe column through a first upper connector (1), the first wall scraper (22) is connected with the second wall scraper (44) through a first male buckle (14), a first sliding sleeve (20) and a first double-female conversion joint (13), the second wall scraper (44) is connected with a third wall scraper (66) through a second male buckle (36), a second sliding sleeve (42) and a second double-female conversion joint (35), and the third wall scraper (66) is connected with a lower downhole tool through a third male buckle (58), a third sliding sleeve (64) and a third double-female conversion joint (57), so that an intelligent pipe column capable of simultaneously realizing drilling, plugging, milling, well dredging and wall scraping operations is formed; the first wall scraper (22) consists of a first upper joint (1), a first body (2), a first locking bolt (3), a first positioning pressing plate (4), a first shearing pin (1), a first scraper group (6), a first group of fish scale type scraper blades (7), a first pressure-bearing rubber sealing sleeve (8), a first pressure-bearing chamber (9), a first spring (10), a first pressing block (11), a first groove (12), a first double-female conversion joint (13), a first male buckle (14), a first sliding sleeve male buckle (15), a first low-density steel ball (16), a first ball seat (17), a first shearing pin (18), a first sealing gasket (19), a first sliding sleeve (20) and a first sliding sleeve female buckle (21); the second wall scraper (44) consists of a second upper joint (23), a second body (24), a second locking bolt (25), a second positioning pressing plate (26), a second shearing pin (27), a second scraper group (28), a second group of fish scale type scraper blades (29), a second pressure-bearing rubber sealing sleeve (30), a second pressure-bearing chamber (31), a second spring (32), a second pressing block (33), a second groove (34), a second double-female conversion joint (35), a second male buckle (36), a second sliding sleeve male buckle (37), a second low-density steel ball (38), a second ball seat (39), a second shearing pin (40), a second sealing gasket (41), a second sliding sleeve (42) and a second sliding sleeve female buckle (43); the third wall scraper (66) consists of a third upper joint (45), a third body (46), a third locking bolt (47), a third positioning pressing plate (48), a third shearing pin (49), a third scraper group (50), a third group of fish scale type scraper blades (51), a third pressure-bearing rubber sealing sleeve (52), a third pressure-bearing chamber (53), a third spring (54), a third pressing block (55), a third groove (56), a third double-female conversion joint (57), a third male buckle (58), a third sliding sleeve male buckle (59), a third low-density steel ball (60), a third shearing pin (61), a third sealing gasket (62), a third ball seat (63), a third sliding sleeve (64) and a third sliding sleeve female buckle (65); the first scraper set (6) consists of a first shearing pin (5), a first group of scale type scraper blades (7), a first pressure-bearing rubber sealing sleeve (8), a first pressure-bearing cavity (9), a first spring (10) and a first pressing block (11), the second scraper set (28) consists of a second shearing pin (27), a second group of scale type scraper blades (29), a second pressure-bearing rubber sealing sleeve (30), a second pressure-bearing cavity (31), a second spring (32) and a second pressing block (33), and the third scraper set (50) consists of a third shearing pin (49), a third group of scale type scraper blades (51), a third pressure-bearing rubber sealing sleeve (52), a third pressure-bearing cavity (53), a third spring (54) and a third pressing block (55); the first scraper group (6) is fixed in the first groove (12) through a first shear pin (5), a first positioning pressing plate (4) and a first locking bolt (3), the second scraper group (28) is fixed in the second groove (12) through a second shear pin (27), a second positioning pressing plate (26) and a second locking bolt (25), and the third scraper group (50) is fixed in the third groove (56) through a third shear pin (49), a third positioning pressing plate (48) and a third locking bolt (47); the first scraper set (6) consists of a first group of scale-type scraper blades (7) circumferentially spaced at 180 degrees, the second scraper set consists of a second group of scale-type scraper blades (29) circumferentially spaced at 180 degrees, and the third scraper set consists of a third group of scale-type scraper blades (51) circumferentially spaced at 180 degrees; the radial sections of the first group of scale-type scraper blades (7), the second group of scale-type scraper blades (29) and the third group of scale-type scraper blades (51) are arc-shaped, the central angle is 60 degrees, the outer diameter is the same as that of the first body (1), the second body (23) and the third body (45) when the scraper is not in operation, the phase angle between the first group of scale-type scraper blades (7) on the first scraper group (6) and the second group of scale-type scraper blades (29) on the second scraper group (28) is 60 degrees, and the phase angle between the second group of scale-type scraper blades (29) on the second scraper group (28) and the third group of scale-type scraper blades (51) on the third scraper group (50) is 60 degrees; before the first shearing pin (5), the second shearing pin (27) and the third shearing pin (49) are sheared, the first positioning pressing plate (4) and the first locking bolt (3) are used for fixing the first pressing block (11), the second positioning pressing plate (26) and the second locking bolt (25) are used for fixing the second pressing block (33), the third positioning pressing plate (48) and the third locking bolt (47) are used for fixing the third pressing block (55), after the first shear pin (5), the second shear pin (27) and the third shear pin (49) are sheared, the first positioning pressing plate (4) and the first locking bolts (3) are used for limiting the radial displacement of the first group of the scale-type scraper blades (7), the second positioning pressing plate (26) and the second locking bolts (25) are used for limiting the radial displacement of the second group of the scale-type scraper blades (29), and the third positioning pressing plate (48) and the third locking bolts (47) are used for limiting the radial displacement of the third group of the scale-type scraper blades (51); the first sliding sleeve (20) consists of a first sliding sleeve male buckle (15), a first low-density steel ball (16), a first ball seat (17), a first shear pin (18), a first sealing gasket (19) and a first sliding sleeve female buckle (21), the first sliding sleeve male buckle (15) is connected with a first double-female conversion joint (13), the first low-density steel ball (16) is in setting fit with the first ball seat (17), and the first sliding sleeve female buckle (21) is connected with a second upper joint (23); the second sliding sleeve (42) consists of a second sliding sleeve male buckle (37), a second low-density steel ball (38), a second ball seat (39), a second shear pin (40), a second sealing gasket (41) and a second sliding sleeve female buckle (43), the second sliding sleeve male buckle (37) is connected with a second double-female conversion joint (35), the second low-density steel ball (38) is in setting fit with the second ball seat (39), and the second sliding sleeve female buckle (43) is connected with a third upper joint (45); the third sliding sleeve (64) consists of a third sliding sleeve male buckle (59), a third low-density steel ball (60), a third ball seat (61), a third shear pin (62), a third sealing gasket (63) and a third sliding sleeve female buckle (65), the third sliding sleeve male buckle (59) is connected with a third double-female conversion joint (57), the third low-density steel ball (60) is in setting fit with the third ball seat (61), and the third sliding sleeve female buckle (65) is connected with a lower downhole tool.

2. The first shear pin (5), the second shear pin (27) and the third shear pin (49) according to claim 1 having the same geometrical dimensions and successively decreasing shear strengths; the first shear pin (18), the second shear pin (40) and the third shear pin (62) have the same geometric dimension, and the shear strength is gradually reduced; the shear strength of the first shear pin (18) is equal to that of the first shear pin (5), ensuring that the shear pins are sheared simultaneously under the same pressure; the shear strength of the second shear pin (40) is equal to the shear strength of the second shear pin (27), ensuring simultaneous shearing at the same pressure; the shear strength of the third shear pin (62) is equal to the shear strength of the third shear pin (49), ensuring simultaneous shearing at the same pressure; the inner diameters of the first ball seat (17), the second ball seat (39) and the third ball seat (61) are reduced in sequence; the outer diameters of the first low-density steel ball (16), the second low-density steel ball (38) and the third low-density steel ball (60) are reduced in sequence.

3. The intelligent wall scraper of the ultra-deep well casing of claim 1 can shear the third shear pin (49) and the third shear pin (62) under the action of the internal pressure of the third body (46) by the third pressure-bearing chamber (53), shear the second shear pin (27) and the second shear pin (40) under the action of the internal pressure of the second body (24) by the second pressure-bearing chamber (31), shear the first shear pin (5) and the first shear pin (18) under the action of the internal pressure of the first body (2) by the first pressure-bearing chamber (9) according to the requirements of the underground wall scraping operation, under the action of spring force, a third group of scale type scraper blades (51) on the third scraper set (50), a second group of scale type scraper blades (29) on the second scraper set (28) and a first group of scale type scraper blades (7) on the first scraper set (6) are sequentially ejected out and tightly attached to the inner wall of the casing pipe, and the wall scraping operation of the non-rotating type 360-degree dead angle of the casing pipe can be realized by lifting and lowering the pipe column.

4. The scraper blades of claim 1 are distributed in a downward-inclined scale manner, when the intelligent wall scraper for the ultra-deep well casing is lifted out and moves upwards, the first spring (10), the second spring (32) and the third spring (54) are compressed, the first scale type scraper blade (7), the second scale type scraper blade (29) and the third scale type scraper blade (51) are automatically tightened, the cutter is prevented from being stuck and a pipe wall is prevented from being damaged, when the intelligent wall scraper for the casing is lowered in and moves downwards, the first spring (10), the second spring (32) and the third spring (54) are stretched, the first scale type scraper blade (7), the second scale type scraper blade (29) and the third scale type scraper blade (51) are further expanded, and obstacles on the inner wall of the casing are effectively removed.

Technical Field

The patent relates to the technical field of complex oil and gas well drilling and well completion engineering, in particular to an intelligent wall scraper for an ultra-deep well casing.

Background

In the well repair and the downhole operation of oil and gas wells, the wall scraper is used for removing cement blocks, hardened mud cakes, hard wax, asphalt, various salt crystals and sediments, perforation burrs, iron oxide and the like generated after the sleeve is rusted and remained on the inner wall of the sleeve, so that various downhole tools can be conveniently and smoothly entered. The wall scraper has the working principle that a cutter is fixed on a wall scraper body, the cutter is required to be larger than the outer diameter of the cutter and slightly smaller than the inner diameter of a sleeve, the wall scraper is driven by a pipe column to rotate and move up and down in the sleeve, and the cutter acts on the inner wall of the sleeve to remove residues (such as cement blocks, scrap iron, dirt, paraffin, asphalt and the like) remained on the inner wall of the sleeve, so that the aim of removing the inner wall of the sleeve is fulfilled.

The maximum outer diameter of a blade of a traditional casing scraper, such as a GRANT5600 type and a 5500 type casing scraper in the United states, is larger than the inner diameter of the casing under the action of a compression spring, so that the traditional casing scraper cannot enter a well simultaneously with tools such as drilling plugs, milling and drifting, and in the process of entering the well, objects such as large cement blocks and the like are usually clamped on a cutter or small-size well bores, so that the conventional casing scraper cannot pass through the conventional casing scraper, and downhole complex accidents such as drilling and blocking are caused, so that the conventional casing scraper is mainly suitable for shallow wells and is not suitable for deep well and ultra-deep well wall scraping operation. The invention patent (CN201220389571.5) provides a novel all-in-one operation hydraulic wall scraper, which can open a blade through hydraulic pressure to scrape the wall after the wall scraper enters a well, and realize that operation tools such as drilling, milling, grinding and drifting can complete various operations by one-trip pipe column descending, but the wall scraping efficiency of the invention is lower, 360-degree dead angle-free wall scraping of the inner wall of a casing cannot be realized, and the wall scraper is easy to block when being lifted out.

The invention patent (CN201310436952.3) provides a ball-throwing type controllable wall scraper and a method for cleaning the inner wall of a casing, which can realize the ejection and retraction of a cutter by throwing two steel balls with different sizes to scrape the wall, smoothly clean the inner wall obstacle of the casing, effectively eliminate the underground potential safety hazard, and prevent the cutter from being stuck and blocked.

The existing casing wall scraping equipment has a good cleaning effect, is complex in structure and difficult to machine and assemble, or is simple in structure and poor in cleaning effect, and is difficult to meet the requirements of deep wells and ultra-deep wells. With the improvement of the level of well completion tools and the continuous promotion of the integration of exploration and development, the challenges are provided for the well drilling and completion and well repair process and technology of deep wells and ultra-deep wells, and the operation mode of realizing multiple functions by adopting one-trip pipe string becomes a trend more and more. Therefore, how to provide an intelligent casing wall device suitable for ultra-deep wells, which has a simple structure and is easy to operate and control is a key problem to be solved urgently by those skilled in the art.

Therefore, the invention provides an intelligent wall scraper for an ultra-deep well casing, which can realize non-rotary 360-degree dead-angle-free wall scraping operation of an ultra-deep well multi-well section and a multi-well diameter inner casing, scrape and remove rust, adhered cement blocks, hardened mud cakes, paraffin, asphalt on the inner wall of the casing, perforation burrs on the wall of the casing, perforation bullets embedded in holes and the like, and can be connected with different pipe columns and downhole tools to form an intelligent pipe column capable of simultaneously realizing operations of drilling, plugging, milling, well dredging and wall scraping.

Disclosure of Invention

The invention aims to provide an intelligent wall scraper for a casing of an ultra-deep well, which aims to solve the technical problem that the one-trip pipe column of the ultra-deep well realizes the non-rotary 360-degree dead-angle-free intelligent wall scraping operation of a multi-well section and multi-well diameter casing.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides an intelligent wall scraper for an ultra-deep well casing, which mainly comprises: the first upper joint, the first body, the first locking bolt, the first positioning pressing plate, the first shearing pin, the first scraper group, the first group of fish scale type scraper blades, the first pressure-bearing rubber sealing sleeve, the first pressure-bearing cavity, the first spring, the first pressing block, the first groove, the first double-female conversion joint, the first male buckle, the first sliding sleeve male buckle, the first low-density steel ball, the first ball seat, the first shearing pin, the first sealing gasket, the first sliding sleeve female buckle, the first wall scraper, the second upper joint, the second body, the second locking bolt, the second positioning pressing plate, the second shearing pin, the second scraper group, the second group of fish scale type scraper blades, the second pressure-bearing rubber sealing sleeve, the second pressure-bearing cavity, the second spring, the second pressing block, the second groove, the second double-female conversion joint, the second male buckle, the second sliding sleeve, the second low-density male buckle, the second low-density steel ball, the second pressure-bearing rubber sealing sleeve, the second, The second shear pin, the second sealing gasket, the second sliding sleeve female buckle, the second wall scraper, a third upper joint, a third body, a third locking bolt, a third positioning pressing plate, a third shear pin, a third scraper group, a third group of fish scale type scraper blades, a third pressure-bearing rubber sealing sleeve, a third pressure-bearing cavity, a third spring, a third pressing block, a third groove, a third double-female conversion joint, a third male buckle, a third sliding sleeve male buckle, a third low-density steel ball, a third shear pin, a third sealing gasket, a third ball seat, a third sliding sleeve female buckle and a third wall scraper; the intelligent wall scraper for the ultra-deep well casing comprises a first wall scraper, a second wall scraper and a third wall scraper, wherein the first wall scraper is connected with an upper pipe column through a first upper joint, the first wall scraper is connected with the second wall scraper through a first male buckle, a first sliding sleeve and a first double-female conversion joint, the second wall scraper is connected with the third wall scraper through a second male buckle, a second sliding sleeve and a second double-female conversion joint, and the third wall scraper is connected with a lower downhole tool through a third male buckle, a third sliding sleeve and a third double-female conversion joint, so that an intelligent pipe column capable of realizing drilling, plugging, milling, well penetrating and wall scraping operations simultaneously is formed; the first wall scraper consists of a first upper joint, a first body, a first locking bolt, a first positioning pressing plate, a first shearing pin, a first scraper set, a first group of fish scale type scraper blades, a first pressure-bearing rubber sealing sleeve, a first pressure-bearing cavity, a first spring, a first pressing block, a first groove, a first double-female conversion joint, a first male buckle, a first sliding sleeve male buckle, a first low-density steel ball, a first ball seat, a first shearing pin, a first sealing gasket, a first sliding sleeve and a first sliding sleeve female buckle; the second wall scraper consists of a second upper joint, a second body, a second locking bolt, a second positioning pressing plate, a second shearing pin, a second scraper group, a second group of fish scale type scraper blades, a second pressure-bearing rubber sealing sleeve, a second pressure-bearing cavity, a second spring, a second pressing block, a second groove, a second double-female conversion joint, a second male buckle, a second sliding sleeve male buckle, a second low-density steel ball, a second ball seat, a second shearing pin, a second sealing gasket, a second sliding sleeve and a second sliding sleeve female buckle; the third wall scraper consists of a third upper joint, a third body, a third locking bolt, a third positioning pressing plate, a third shearing pin, a third scraper set, a third group of fish scale type scraper blades, a third pressure-bearing rubber sealing sleeve, a third pressure-bearing cavity, a third spring, a third pressing block, a third groove, a third double-female conversion joint, a third male buckle, a third sliding sleeve male buckle, a third low-density steel ball, a third ball seat, a third shearing pin, a third sealing gasket, a third sliding sleeve and a third sliding sleeve female buckle; the first scraper group consists of a first shearing pin, a first group of scale type scraper blades, a first pressure-bearing rubber sealing sleeve, a first pressure-bearing cavity, a first spring and a first pressing block, the second scraper group consists of a second shearing pin, a second group of scale type scraper blades, a second pressure-bearing rubber sealing sleeve, a second pressure-bearing cavity, a second spring and a second pressing block, and the third scraper group consists of a third shearing pin, a third group of scale type scraper blades, a third pressure-bearing rubber sealing sleeve, a third pressure-bearing cavity, a third spring and a third pressing block; the first scraper group is fixed in the first groove through a first shearing pin, a first positioning pressing plate and a first locking bolt, the second scraper group is fixed in the second groove through a second shearing pin, a second positioning pressing plate and a second locking bolt, and the third scraper group is fixed in the third groove through a third shearing pin, a third positioning pressing plate and a third locking bolt; the first scraper group consists of a first group of scale-type scraper blades circumferentially spaced at 180 degrees, the second scraper group consists of a second group of scale-type scraper blades circumferentially spaced at 180 degrees, and the third scraper group consists of a third group of scale-type scraper blades circumferentially spaced at 180 degrees; the radial sections of the first group of scale type scraper blades, the second group of scale type scraper blades and the third group of scale type scraper blades are arc-shaped, the center angle is 60 degrees, when the scraper is not in operation, the outer diameter is the same as the outer diameters of the first body, the second body and the third body, the phase angle between the first group of scale type scraper blades on the first scraper group and the second group of scale type scraper blades on the second scraper group is 60 degrees, the phase angle between the second group of scale type scraper blades on the second scraper group and the third group of scale type scraper blades on the third scraper group is 60 degrees, and therefore wall scraping operation without dead angles of 360 degrees in the circumferential direction of the inner wall of the sleeve can be achieved; before the first shearing pin, the second shearing pin and the third shearing pin are sheared, the first positioning press plate and the first locking bolt are used for fixing the first pressing block, the second positioning press plate and the second locking bolt are used for fixing the second pressing block, the third positioning press plate and the third locking bolt are used for fixing the third pressing block, after the first shearing pin, the second shearing pin and the third shearing pin are sheared, the first positioning press plate and the first locking bolt are used for limiting the radial displacement of the first group of scale type scraper blades, the second positioning press plate and the second locking bolt are used for limiting the radial displacement of the second group of scale type scraper blades, and the third positioning press plate and the third locking bolt are used for limiting the radial displacement of the third group of scale type scraper blades; the first sliding sleeve consists of a first sliding sleeve male buckle, a first low-density steel ball, a first ball seat, a first shear pin, a first sealing gasket and a first sliding sleeve female buckle, the first sliding sleeve male buckle is connected with a first double-female conversion joint, the first low-density steel ball is in seating fit with the first ball seat, and the first sliding sleeve female buckle is connected with a second upper joint; the second sliding sleeve consists of a second sliding sleeve male buckle, a second low-density steel ball, a second ball seat, a second shear pin, a second sealing gasket and a second sliding sleeve female buckle, the second sliding sleeve male buckle is connected with a second double-female conversion joint, the second low-density steel ball is in seating fit with the second ball seat, and the second sliding sleeve female buckle is connected with a third upper joint; the third sliding sleeve is composed of a third sliding sleeve male buckle, a third low-density steel ball, a third ball seat, a third shear pin, a third sealing gasket and a third sliding sleeve female buckle, the third sliding sleeve male buckle is connected with a third double-female adapter, the third low-density steel ball is in seating fit with the third ball seat, and the third sliding sleeve female buckle is connected with a lower downhole tool.

The first shear pin, the second shear pin and the third shear pin have the same geometric dimension, and the shear strength is gradually reduced; the first shear pin, the second shear pin and the third shear pin have the same geometric dimension, and the shear strength is gradually reduced; the shear strength of the first shear pin is equal to that of the first shear pin, so that the first shear pin is ensured to be sheared simultaneously under the same pressure; the shear strength of the second shear pin is equal to that of the second shear pin, so that the second shear pin is ensured to be sheared simultaneously under the same pressure; the shear strength of the third shear pin is equal to that of the third shear pin, so that the third shear pin is ensured to be sheared simultaneously under the same pressure; the inner diameters of the first ball seat, the second ball seat and the third ball seat are reduced in sequence; the outer diameters of the first low-density steel ball, the second low-density steel ball and the third low-density steel ball are reduced in sequence.

According to the requirements of underground wall scraping operation, the third pressure-bearing chamber cuts a third shearing pin and a third shearing pin under the action of the internal pressure of a third body, the second pressure-bearing chamber cuts a second shearing pin and a second shearing pin under the action of the internal pressure of a second body, the first pressure-bearing chamber cuts a first shearing pin and a first shearing pin under the action of the internal pressure of a first body, the third group of scale type scraper blades on the third scraper set, the second group of scale type scraper blades on the second scraper set and the first group of scale type scraper blades on the first scraper set are sequentially ejected out and tightly attached to the inner wall of the casing under the action of spring force, and the wall scraping operation of the casing in a non-rotating mode with 360 degrees and no dead angle can be realized by lifting and lowering the pipe column.

The first spring, the second spring and the third spring are automatically tightened to prevent the cutter from being clamped and damaging the pipe wall, and when the intelligent wall scraper of the sleeve enters and moves downwards, the first spring, the second spring and the third spring are stretched to further expand the first scale-type scraper, the second scale-type scraper and the third scale-type scraper, so that obstacles on the inner wall of the sleeve are effectively removed.

The invention has the advantages that: the intelligent wall scraper can realize non-rotary 360-degree dead angle-free intelligent wall scraping operation of an inner sleeve of an ultra-deep well and a multi-well diameter in a multi-well section, scrape rust, adhered cement blocks, hardened mud cakes, paraffin, asphalt on the inner wall of the sleeve, perforation burrs on the wall of the sleeve, perforation bullets embedded in holes and the like, and is connected with different tubular columns and downhole tools to form an intelligent tubular column capable of realizing simultaneous drilling, plugging, milling, well dredging and wall scraping operation.

Drawings

FIG. 1 is a schematic view of an intelligent wall scraper for casing of ultra-deep well according to the present invention;

FIG. 2 is a schematic view of the configuration of the first, second and third pluralities of scale-type scraping blades of the present invention;

FIG. 3 is a schematic view of the first, second and third sliding sleeves according to the present invention;

FIG. 4 is a schematic view of a first dual-mother adapter structure according to the present invention.

Detailed Description

As shown in the attached drawings, the invention provides an intelligent wall scraper for an ultra-deep well casing, which mainly comprises: the first upper joint 1, the first body 2, the first locking bolt 3, the first positioning pressing plate 4, the first shearing pin 5, the first scraper group 6, the first group of fish scale type scraper blades 7, the first pressure-bearing rubber sealing sleeve 8, the first pressure-bearing chamber 9, the first spring 10, the first pressing block 11, the first groove 12, the first double-female conversion joint 13, the first male buckle 14, the first sliding sleeve male buckle 15, the first low-density steel ball 16, the first ball seat 17, the first shearing pin 18, the first sealing gasket 19, the first sliding sleeve 20, the first sliding sleeve female buckle 21, the first wall scraper 22, the second upper joint 23, the second body 24, the second locking bolt 25, the second positioning pressing plate 26, the second shearing pin 27, the second scraper group 28, the second group of fish scale type scraper blades 29, the second pressure-bearing rubber sealing sleeve 30, the second pressure-bearing chamber 31, the second spring 32, the second pressing block 33, the second groove 34, A second double female conversion joint 35, a second male buckle 36, a second sliding sleeve male buckle 37, a second low-density steel ball 38, a second ball seat 39, a second shear pin 40, a second sealing gasket 41, a second sliding sleeve 42, a second sliding sleeve female buckle 43, a second wall scraper 44, a third upper joint 45, a third body 46, a third locking bolt 47, a third positioning pressing plate 48, a third shear pin 49, a third scraper group 50, a third fish scale scraper 51, a third pressure-bearing rubber 52, a third pressure-bearing chamber 53, a third spring 54, a third pressing block 55, a third groove 56, a third double female conversion joint 57, a third male buckle 58, a third sliding sleeve male buckle 59, a third low-density steel ball 60, a third ball seat 61, a second shear pin 62, a second sealing gasket 63, a third sliding sleeve 64, a third sliding sleeve female buckle 65 and a third wall scraper 66; the ultra-deep well casing intelligent wall scraper consists of a first wall scraper 22, a second wall scraper 44 and a third wall scraper 66, wherein the first wall scraper 22 is connected with an upper pipe string through a first upper joint 1, the first wall scraper 22 is connected with the second wall scraper 44 through a first male buckle 14, a first sliding sleeve 20 and a first double-female conversion joint 13, the second wall scraper 44 is connected with the third wall scraper 66 through a second male buckle 36, a second sliding sleeve 42 and a second double-female conversion joint 35, and the third wall scraper 66 is connected with a lower downhole tool through a third male buckle 58, a third sliding sleeve 64 and a third double-female conversion joint 57, so that an intelligent pipe string capable of realizing drilling, milling, well dredging and wall scraping operations at the same time is formed; the first wall scraper 22 consists of a first upper joint 1, a first body 2, a first locking bolt 3, a first positioning pressing plate 4, a first shearing pin 5, a first scraper group 6, a first group of fish scale type scraper blades 7, a first pressure-bearing rubber sealing sleeve 8, a first pressure-bearing chamber 9, a first spring 10, a first pressing block 11, a first groove 12, a first double-female conversion joint 13, a first male buckle 14, a first sliding sleeve male buckle 15, a first low-density steel ball 16, a first ball seat 17, a first shearing pin 18, a first sealing gasket 19, a first sliding sleeve 20 and a first sliding sleeve female buckle 21; the second wall scraper 44 is composed of a second upper joint 23, a second body 24, a second locking bolt 25, a second positioning pressing plate 26, a second shearing pin 27, a second scraper group 28, a second group of fish scale type scraper blades 29, a second pressure-bearing rubber sealing sleeve 30, a second pressure-bearing chamber 31, a second spring 32, a second pressing block 33, a second groove 34, a second double-female conversion joint 35, a second male buckle 36, a second sliding sleeve male buckle 37, a second low-density steel ball 38, a second ball seat 39, a second shearing pin 40, a second sealing gasket 41, a second sliding sleeve 42 and a second sliding sleeve female buckle 43; the third wall scraper 66 consists of a third upper joint 45, a third body 46, a third locking bolt 47, a third positioning pressing plate 48, a third shearing pin 49, a third scraper group 50, a third group of fish scale type scraper blades 51, a third pressure-bearing rubber sealing sleeve 52, a third pressure-bearing chamber 53, a third spring 54, a third pressing block 55, a third groove 56, a third double-female conversion joint 57, a third male buckle 58, a third sliding sleeve male buckle 59, a third low-density steel ball 60, a third shearing pin 61, a third sealing gasket 62, a third ball seat 63, a third sliding sleeve 64 and a third sliding sleeve female buckle 65; the first scraper group 6 consists of a first shearing pin 5, a first group of fish scale type scraper blades 7, a first pressure-bearing rubber sealing sleeve 8, a first pressure-bearing chamber 9, a first spring 10 and a first pressing block 11, the second scraper group 28 consists of a second shearing pin 27, a second group of fish scale type scraper blades 29, a second pressure-bearing rubber sealing sleeve 30, a second pressure-bearing chamber 31, a second spring 32 and a second pressing block 33, and the third scraper group 50 consists of a third shearing pin 49, a third group of fish scale type scraper blades 51, a third pressure-bearing rubber sealing sleeve 52, a third pressure-bearing chamber 53, a third spring 54 and a third pressing block 55; the first scraper group 6 is fixed in the first groove 12 through a first shear pin 5, a first positioning pressing plate 4 and a first locking bolt 3, the second scraper group 28 is fixed in the second groove 12 through a second shear pin 27, a second positioning pressing plate 26 and a second locking bolt 25, and the third scraper group 50 is fixed in the third groove 56 through a third shear pin 49, a third positioning pressing plate 48 and a third locking bolt 47; the first scraper set 6 consists of a first group of scale-type scraper blades 7 circumferentially spaced at 180 degrees, the second scraper set consists of a second group of scale-type scraper blades 29 circumferentially spaced at 180 degrees, and the third scraper set consists of a third group of scale-type scraper blades 51 circumferentially spaced at 180 degrees; the radial sections of the first group of scale-type scraper blades 7, the second group of scale-type scraper blades 29 and the third group of scale-type scraper blades 51 are arc-shaped, the central angle is 60 degrees, when the scraper is not in operation, the outer diameter is the same as the outer diameters of the first body 1, the second body 23 and the third body 45, the phase angle between the first group of scale-type scraper blades 7 on the first scraper group 6 and the second group of scale-type scraper blades 29 on the second scraper group 28 is 60 degrees, the phase angle between the second group of scale-type scraper blades 29 on the second scraper group 28 and the third group of scale-type scraper blades 51 on the third scraper group 50 is 60 degrees, and therefore wall scraping operation without dead angles of 360 degrees in the circumferential direction of the inner wall of the sleeve can be achieved; before the first shearing pin 5, the second shearing pin 27 and the third shearing pin 49 are sheared, the first positioning pressing plate 4 and the first locking bolt 3 are used for fixing the first pressing block 11, the second positioning pressing plate 26 and the second locking bolt 25 are used for fixing the second pressing block 33, the third positioning pressing plate 48 and the third locking bolt 47 are used for fixing the third pressing block 55, after the first shearing pin 5, the second shearing pin 27 and the third shearing pin 49 are sheared, the first positioning pressing plate 4 and the first locking bolt 3 are used for limiting the radial displacement of the first group of scale-type scraper blades 7, the second positioning pressing plate 26 and the second locking bolt 25 are used for limiting the radial displacement of the second group of scale-type scraper blades 29, and the third positioning pressing plate 48 and the third locking bolt 47 are used for limiting the radial displacement of the third group of scale-type scraper blades 51; the first sliding sleeve 20 consists of a first sliding sleeve male buckle 15, a first low-density steel ball 16, a first ball seat 17, a first shear pin 18, a first sealing gasket 19 and a first sliding sleeve female buckle 21, the first sliding sleeve male buckle 15 is connected with the first double-female conversion joint 13, the first low-density steel ball 16 is in seating fit with the first ball seat 17, and the first sliding sleeve female buckle 21 is connected with a second upper joint 23; the second sliding sleeve 42 consists of a second sliding sleeve male buckle 37, a second low-density steel ball 38, a second ball seat 39, a second shear pin 40, a second sealing gasket 41 and a second sliding sleeve female buckle 43, the second sliding sleeve male buckle 37 is connected with the second double-female conversion joint 35, the second low-density steel ball 38 is in seating fit with the second ball seat 39, and the second sliding sleeve female buckle 43 is connected with a third upper joint 45; the third sliding sleeve 64 is composed of a third sliding sleeve male buckle 59, a third low-density steel ball 60, a third ball seat 61, a third shear pin 62, a third sealing gasket 63 and a third sliding sleeve female buckle 65, the third sliding sleeve male buckle 59 is connected with a third double-female conversion joint 57, the third low-density steel ball 60 is in seating fit with the third ball seat 61, and the third sliding sleeve female buckle 65 is connected with a lower downhole tool.

The first shear pin 5, the second shear pin 27 and the third shear pin 49 have the same geometric dimension, and the shear strength is gradually reduced; the first shear pin 18, the second shear pin 40 and the third shear pin 62 have the same geometric dimension, and the shear strength is gradually reduced; the shear strength of the first shear pin 18 is equal to the shear strength of the first shear pin 5, ensuring simultaneous shearing at the same pressure; the shear strength of the second shear pin 40 is equal to the shear strength of the second shear pin 27, ensuring simultaneous shearing at the same pressure; the shear strength of the third shear pin 62 is equal to the shear strength of the third shear pin 49, ensuring simultaneous shearing at the same pressure; the inner diameters of the first ball seat 17, the second ball seat 39 and the third ball seat 61 are reduced in sequence; the outer diameters of the first low-density steel ball 16, the second low-density 38 steel ball, and the third low-density steel ball 60 are reduced in order.

According to the intelligent wall scraper for the ultra-deep well casing, the third pressure-bearing chamber 53 can shear the third shearing pin 49 and the third shearing pin 62 under the action of the internal pressure of the third body 46, the second pressure-bearing chamber 31 can shear the second shearing pin 27 and the second shearing pin 40 under the action of the internal pressure of the second body 24, the first pressure-bearing chamber 9 can shear the first shearing pin 5 and the first shearing pin 18 under the action of the internal pressure of the first body 2, the third group of fish scale type scraper blades 51 on the third scraper set 50, the second group of fish scale type scraper blades 29 on the second scraper set 28 and the first group of fish scale type scraper blades 7 on the first scraper set 6 are sequentially ejected and tightly attached to the inner wall of the casing under the action of spring force, and the non-rotary type wall scraping operation without dead angle of 360 degrees can be realized by lifting and lowering the casing.

The scraper blades are distributed in a downward-inclined scale manner, when the intelligent wall scraper of the sleeve pipe is lifted out and moves upwards, the first spring 10, the second spring 32 and the third spring 54 are compressed, the first group of scale type scraper blades 7, the second group of scale type scraper blades 29 and the third group of scale type scraper blades 51 are automatically tightened, the phenomenon that a cutter is clamped and a pipe wall is damaged is avoided, when the intelligent wall scraper of the sleeve pipe is lifted in and moves downwards, the first spring 10, the second spring 32 and the third spring 54 are stretched, the first group of scale type scraper blades 7, the second group of scale type scraper blades 29 and the third group of scale type scraper blades 51 are further expanded, and obstacles on the inner wall of the sleeve pipe are effectively removed.

In order to make the objects, technical solutions and advantages of the present invention more clear, the following description of the embodiments of the present invention with reference to the accompanying drawings 1, 2, 3 and 4 includes the following detailed steps:

the method comprises the following steps: the geometric dimension and the component shear strength of the intelligent wall scraper are designed by combining the practical working condition of a certain well of an oilfield in western China, the simultaneous shearing pressure of a third shearing pin 49 and a third shearing pin 62 is designed to be 30MPa, the simultaneous shearing pressure of a second shearing pin 27 and a second shearing pin 40 is designed to be 35MPa, and the simultaneous shearing pressure of a first shearing pin 5 and a first shearing pin 18 is designed to be 40 MPa; because under the actual working condition, the pressure control is relatively complex and is difficult to achieve very accurately, so in the design of the first pressure-bearing chamber 9, the second pressure-bearing chamber 31 and the third pressure-bearing chamber 53, an injector model is adopted, the bearing pressure of the first pressure-bearing chamber 9, the second pressure-bearing chamber 31 and the third pressure-bearing chamber 53 is slightly higher than the shearing pressure of the shearing pins at the same level, and because the first pressure-bearing chamber 9, the second pressure-bearing chamber 31 and the third pressure-bearing chamber 53 can bear partial pressure, the shearing pins and the shearing pins at the same level can be sheared simultaneously under the complex working condition.

Step two: assembling the intelligent wall scraper of the ultra-deep well: the first pressure-bearing rubber sealing sleeve 8 and the first spring 10 are respectively arranged in a first pressure-bearing cavity 9 and a spring groove of the first scraper set 6, the first pressing block 11 and the first scraper set 6 are connected through the first shearing pin 5, the first positioning pressing plate 4 is fixed on the first pressing block 11 through the first locking bolt 3, the first spring 10 is in a compression state, and the second scraper set 28 and the third scraper set 50 are installed in the same way.

Step three: the first, second and third wall scrapers 22, 44, 66 are connected: the installed first wall scraper 22 is connected with the second wall scraper 44 through the first male buckle 14, the first sliding sleeve 20 and the first double-female adapter 13, and the second wall scraper 44 is connected with the third wall scraper 66 through the second male buckle 35, the second sliding sleeve 42 and the second double-female adapter 35.

Step four: the intelligent tubular column is connected: the first wall scraper 22 is connected with the upper pipe string through the first upper joint 1, and the third wall scraper 66 is connected with the lower downhole tool through the third male buckle 58, the third sliding sleeve 64 and the third double-female adapter 57, so that an intelligent pipe string capable of realizing drilling, plugging, milling, well dredging and wall scraping operations simultaneously is formed.

Step five: the intelligent pipe column is put into the target depth needing wall scraping operation, firstly, a third low-density steel ball 60 is thrown and sealed to a third ball seat 61, the pressure is applied to the interior of the casing to 30MPa, a third shearing pin 49 and a third shearing pin 62 are cut off, a third scraper set 50 is popped out and tightly attached to the inner wall of the casing, secondly, a second low-density steel ball 38 is thrown and sealed to a second ball seat 39, the pressure is applied to the interior of the casing to 35MPa, a second shearing pin 27 and a second shearing pin 40 are cut off, a second scraper set 28 is popped out and tightly attached to the inner wall of the casing, and finally, a first low-density steel ball 16 is thrown and sealed to a first ball seat 17, the pressure is applied to the interior of the casing to 40MPa, a first shearing pin 5 and a first shearing pin 18 are cut off, and a first scraper set 6 is popped out and tightly attached to the inner wall of the casing, so that the intelligent wall scraping operation without rotating dead.

Step six: on the basis of the fifth step, any scraper set can be selectively opened to scrape the wall according to the actual underground working condition and the field requirement.