阅读说明：本技术 均匀射流解堵充填一体化工艺管柱及方法 (Uniform jet flow blockage removal and filling integrated process pipe column and method ) 是由 李常友 陈刚 魏庆彩 马丁 王东 高雪峰 王勇 吕超 王冰 张川庭 于 2018-07-06 设计创作，主要内容包括：本发明公开了均匀射流解堵充填一体化工艺管柱及方法,其中管柱包括均匀射流解堵充填外管柱和内管柱。其中,外管柱包括自上而下依次连接的油管、液流夹壁转换工具的夹壁外管、压差式阻流封隔器、射流解堵工具。内管柱包括液流夹壁转换工具的夹壁内管、内充填管及酸洗充填内工具。所述均匀射流解堵充填外管柱和内管柱通过液流夹壁转换工具进行连接,并下入井内,内外管柱之间可形成环空,为酸洗、挤压循环充填提供液流通道。该工艺管柱可以实现一趟管柱完成水平井长井段的筛管射流、近井均匀酸洗解堵及挤压、循环充填防砂施工。(The invention discloses a uniform jet flow blockage removal and filling integrated process pipe column and a method, wherein the pipe column comprises an outer pipe column and an inner pipe column which are filled with uniform jet flow blockage removal. The outer pipe column comprises an oil pipe, a double-wall outer pipe of the liquid flow double-wall conversion tool, a differential choke packer and a jet flow blockage removing tool which are sequentially connected from top to bottom. The inner pipe column comprises a double-wall inner pipe of the liquid flow double-wall conversion tool, an inner filling pipe and an acid washing and filling inner tool. The uniform jet flow plug removal filling outer pipe column and the inner pipe column are connected through a liquid flow double-wall conversion tool and are put into a well, an annular space can be formed between the inner pipe column and the outer pipe column, and a liquid flow channel is provided for pickling and extrusion circulating filling. The process pipe column can realize that screen pipe jet flow, near well uniform acid washing blockage removal and extrusion, and circulating filling sand prevention construction of a long well section of a horizontal well can be completed by one time of pipe column.)

1. The uniform jet flow blockage removal and filling integrated process pipe column is characterized by comprising a uniform jet flow blockage removal and filling outer pipe column and a uniform jet flow blockage removal and filling inner pipe column, wherein the uniform jet flow blockage removal and filling outer pipe column comprises an oil pipe, a double-wall outer pipe of a liquid flow double-wall conversion tool, a differential choke packer and a jet flow blockage removal tool which are sequentially connected from top to bottom; the oil pipe is in threaded connection with an upper connector of the liquid flow double-wall conversion tool, a lower connector of the liquid flow double-wall conversion tool is connected with an upper flow blocking connector of a differential flow blocking packer, a lower connector of the differential flow blocking packer is connected with a coupling of a jet flow blockage removing tool, the upper portion of an inner filling pipe is connected with a double-wall inner pipe of the liquid flow double-wall conversion tool, the inner filling pipe penetrates through the differential flow blocking packer and the jet flow blockage removing tool, the lower portion of the inner filling pipe is connected with an acid washing filling inner tool of the bottom acid washing filling tool, the inner filling pipe, the differential flow blocking packer and the jet flow blockage removing tool sleeved outside form an annular space, and the bottom acid washing filling tool is connected with an external sieve pipe through a variable buckle connector of the bottom acid.

2. The integrated uniform jet flow plug removal and filling process string as recited in claim 1, wherein the differential pressure type choke packer and the jet flow plug removal tool are arranged at intervals, and the number of the differential pressure type choke packer and the jet flow plug removal tool is set according to the length of a well section of an oil reservoir.

3. The uniform jet flow blockage relieving and filling integrated process pipe column as claimed in claim 1 or 2, wherein the liquid flow double wall conversion tool comprises a double wall outer pipe and a double wall inner pipe, wherein the double wall outer pipe comprises an upper joint, a hanger, a double wall inner pipe, an upper baffle ring I, an upper baffle ring II, a support ring I, a leather cup I, a press cap I, a support ring II, a leather cup II, a press cap II, a lower joint and a centralizer; wherein, a liquid inlet hole is arranged on the hanger, the upper part of the liquid flow double-wall conversion tool is in threaded connection with the oil pipe through an upper joint, the hanger is in a tubular structure and is positioned outside the inner pipe of the double-wall, an annular space is formed between the suspension device and the inner pipe of the double-wall, the upper ends of the suspension device and the inner pipe of the double-wall are both connected with an upper joint, a leather cup I and a leather cup II are sleeved outside the suspension device, the inner wall of the first leather cup is fixed on the hanger through the first supporting framework, the inner wall of the second leather cup is fixed on the hanger through the second supporting framework, the first pressing cap is installed at the bottom end of the first leather cup, the second pressing cap is installed at the lower end of the second leather cup, the upper end of the first supporting framework is connected with the first supporting ring, the upper end of the second supporting framework is connected with the second supporting ring, the outer wall of the hanger is further sleeved with a first upper retaining ring and a second upper retaining ring which are arranged side by side, the first upper retaining ring and the second upper retaining ring are blocked at the upper end of the first supporting ring, the lower end of the hanger is connected with a lower joint, and the outer wall of the lower joint is provided with a centralizer.

4. The uniform jet flow deblocking and filling integrated process string according to claim 1 or 2, wherein the differential choke packer comprises a choke seal upper joint, a choke seal upper connecting piece, a choke seal inner tube, a choke seal cup, a choke seal supporting framework, a choke seal pressing cap, a choke seal upper pin, a choke seal spring, a choke seal fixing ring, a choke seal lower connecting piece, a choke seal lower pin and a choke seal lower joint, wherein the choke seal upper joint is in threaded connection with the lower joint of the fluid clip wall transition tool, the upper end of the choke seal inner tube is connected with the choke seal upper joint, the lower end of the choke seal inner tube is connected with the choke seal lower joint, the choke seal spring and the choke seal cup are sleeved outside the choke seal inner tube, the inner wall of the choke seal cup is fixed outside the choke seal inner tube through the choke seal supporting framework, and the upper end of the choke seal supporting framework is connected with the choke seal upper connecting piece, the lower end of the flow-resisting sealing leather cup is provided with a flow-resisting sealing cap, the flow-resisting sealing cap is fixed on a flow-resisting sealing support framework through a flow-resisting upper pin, the upper end of a flow-resisting sealing spring abuts against the lower end of the flow-resisting sealing cap, the lower end of the flow-resisting sealing spring abuts against a flow-resisting sealing fixing ring, the lower end of the flow-resisting sealing fixing ring abuts against a flow-resisting sealing lower connecting piece, and the flow-resisting sealing lower connecting piece is fixed on the outer wall of a flow-resisting sealing lower connector through a.

5. The uniform jet flow blockage relieving and filling integrated process pipe column as claimed in claim 1 or 2, wherein the jet flow blockage relieving tool comprises a coupling, a body, a nozzle and a sealing device, the coupling is in threaded connection with the lower connector of the differential pressure type flow blocking packer, the upper end of the body is connected with the coupling, the body is provided with the radial nozzle, the jet flow blockage relieving tool is provided with a plurality of parts according to the length of an oil layer, the parts are mutually connected with the differential pressure type flow blocking packer and are matched for use, only the jet flow blockage relieving tool at the lowest part is provided with the sealing device, and the sealing device is arranged on the inner wall of the body.

6. The uniform jet flow plug removal and filling integrated process pipe string as claimed in claim 1 or 2, wherein the bottom acid washing and filling tool comprises an acid washing and filling outer pipe string and an acid washing and filling inner tool, the acid washing and filling outer pipe string comprises a buckle change joint, an acid washing and filling outer tool, an acid washing and filling sliding sleeve outer tool, an acid washing and filling pressure cap, a positioning short section and a screwed plug, the upper end of the acid washing and filling inner tool is connected with an inner filling pipe, the lower end of the acid washing and filling outer tool extends into the acid washing and filling outer tool, the upper end of the acid washing and filling outer tool is connected with the buckle change joint, the lower end of the acid washing and filling outer tool is connected with the acid washing and filling sliding sleeve outer tool, the acid washing and filling sliding sleeve inner wall and the acid washing and filling sliding sleeve inner tool are sleeved with the, the lower end of the pickling filling pressure cap is connected with a screwed plug, the inner wall of the pickling filling pressure cap is provided with a positioning short section for limiting a pickling filling inner tool to move downwards, the pickling filling inner tool is provided with a radial liquid flow port I, the pickling filling pressure cap is provided with a radial liquid flow port II, and the variable buckle joint is connected with an external sieve tube.

7. The uniform jet flow blockage removal and filling integrated process method is characterized by comprising the following steps of:

c, pipe column descending: firstly, connecting an acid-washing filling outer pipe column with a sieve pipe and putting the acid-washing filling outer pipe column into a well; then, at least one group of unit modules formed by connecting a differential pressure type choke packer and a jet flow deblocking tool are put into the well and hung on the well mouth through an elevator, then an acid washing filling inner tool is connected with an inner filling pipe and put into the well, the well mouth is connected through an upper connector of a liquid flow double-wall conversion tool, meanwhile, an upper connector of the choke packer is connected with a lower connector of the liquid flow double-wall conversion tool, and then an inner pipe column and an outer pipe column are put into the well simultaneously;

acid washing process: the oil pipe gate is closed, acid liquor enters from the oil sleeve annulus and enters from the liquid inlet hole of the liquid flow double-wall conversion tool into the double-wall annulus, and because the jet flow blockage removing tool at the lowest part is provided with the sealing device, the acid liquor enters into an oil layer through the jet flow blockage removing tool, the uniform acid distribution of the acid liquor is realized by setting the number and the size of the jet flow blockage removing tool in advance, and simultaneously mud cakes are washed and loosened and stripped; opening an oil pipe gate, continuously injecting backwashing liquid, enabling the liquid to pass through a liquid flow wall-clamping conversion tool, a jet flow blockage removal tool, an oil layer, a liquid flow port II of a bottom acid washing filling tool, enter an inner filling pipe, and then return out of a well mouth through an oil pipe;

and (3) extrusion filling process: closing the casing gate, extruding the sand mixing liquid from the inside of the oil pipe, wherein the sand mixing liquid enters the stratum through the inner filling pipe and then through the liquid flow port II of the pickling filling tool at the bottom to realize extrusion filling;

and (3) a cyclic filling process: and opening the casing gate, extruding the sand mixing liquid from the inside of the oil pipe, enabling the sand mixing liquid to pass through the inner filling pipe, enter the screen pipe well section through the liquid flow port II of the bottom pickling filling tool, and return to the well mouth through the empty oil sleeve ring, so that circular filling is realized.

Technical Field

The invention relates to the field of a blockage removing and filling integrated process, in particular to a uniform jet flow blockage removing and filling integrated process pipe column and a method.

Background

In the running process of the screen pipe for the open hole horizontal well completion, slurry blockage of the screen pipe is easy to occur, and the prior acid washing technology cannot realize uniform blockage removal of the screen pipe and uniform acid distribution of a long well section, so that the blockage of a near well and the screen pipe after the screen pipe completion is not thoroughly removed, and the seepage capability and the liquid supply capability of a later-period oil well are influenced. In order to solve the problems, a secondary running pipe column is adopted to carry out open hole sieve tube gravel packing sand prevention construction, and stratum blockage is further removed. In order to simplify the process and improve the acid washing effect, a uniform jet flow blockage removal and filling integrated process pipe column and a method are developed, the technical problem of conventional acid washing is solved, and open hole sieve pipe well completion acidizing blockage removal and filling integrated construction is realized.

Application No.: 201020175850.2, published 2011-01-12 discloses a horizontal well continuous jet flow blockage removal pipe column which is applied to horizontal well continuous jet flow sand removal blockage removal. A self-sealing well sealer is fixed on the ground well mouth, and a sealing working barrel is hung in the sleeve and at the lower part of the self-sealing well sealer. The flushing fluid inlet is communicated with an annular space between the sleeve and the sealing working barrel. And an oil pipe is arranged in the sealing working barrel, and the flushing fluid outlet is communicated with an annular space between the oil pipe and the sealing working barrel. The upper end of each oil pipe is connected with a back flush valve. The back washing valve is arranged in the sealed working barrel. The lower part of an oil pipe connected with the back flush valve is connected with a shaft liquid flow converter. The lower end of the shaft liquid flow converter is connected with an oil pipe, and the lower end of the oil pipe is connected with a rotary jet flow well washer. The device has the effects that the continuous sand washing and blockage removal of the horizontal well can be realized, and the pump is not stopped when the lengthened oil pipe moves forwards to move the rotary jet flow well washer.

However, the above-mentioned disclosed technology is essentially different from the present application in the specific technical solutions, technical problems to be solved, technical effects, etc., and although the technical means of the rotary jet well-flushing device is utilized, the connection relationship of all components of the present application as the device itself can realize the uniform acid distribution of the oil layer, and can flush the blockage to ensure a good blockage removal effect. More importantly, the sand control construction can also be performed by circulating filling. The prior art does not solve the above problems, nor does the prior art have technical teaching.

Disclosure of Invention

The invention aims to provide a uniform jet flow blockage removal and filling integrated process pipe column and a method, the process pipe column can realize that one-trip pipe column completes screen pipe jet flow of a long well section of a horizontal well, uniform acid cleaning blockage removal and extrusion of a near well and sand prevention construction of circulating filling, ensures good blockage removal effect of a naked eye horizontal section, fully exerts the productivity of the naked eye horizontal well and achieves the optimal sand prevention production effect; meanwhile, the tubular column simplifies the construction process by optimizing the structural design, greatly improves the construction efficiency and the construction success rate, reduces the operation cost and prolongs the service life of the sand control well.

In order to achieve the purpose, the invention adopts the following technical scheme that the uniform jet flow blockage relieving and filling integrated process pipe column comprises a uniform jet flow blockage relieving and filling outer pipe column and a uniform jet flow blockage relieving and filling inner pipe column, wherein the uniform jet flow blockage relieving and filling outer pipe column comprises an oil pipe, a double-wall outer pipe of a liquid flow double-wall conversion tool, a differential choke packer and a jet flow blockage relieving tool which are sequentially connected from top to bottom, and the uniform jet flow blockage relieving and filling inner pipe column comprises a double-wall inner pipe, an inner filling pipe and an acid washing and filling inner tool of a bottom acid washing and filling tool which are sequentially connected from top to bottom; the oil pipe is in threaded connection with an upper connector of the liquid flow double-wall conversion tool, a lower connector of the liquid flow double-wall conversion tool is connected with an upper flow blocking connector of a differential flow blocking packer, a lower connector of the differential flow blocking packer is connected with a coupling of a jet flow blockage removing tool, the upper portion of an inner filling pipe is connected with a double-wall inner pipe of the liquid flow double-wall conversion tool, the inner filling pipe penetrates through the differential flow blocking packer and the jet flow blockage removing tool, the lower portion of the inner filling pipe is connected with an acid washing filling inner tool of the bottom acid washing filling tool, the inner filling pipe, the differential flow blocking packer and the jet flow blockage removing tool sleeved outside form an annular space, and the bottom acid washing filling tool is connected with an external sieve pipe through a variable buckle connector of the bottom acid.

The differential pressure type flow blocking packer and the jet flow blockage removing tool are arranged at intervals, and the number of the differential pressure type flow blocking packer and the jet flow blockage removing tool is set according to the length of an oil layer well section.

The liquid flow double-wall conversion tool comprises a double-wall outer pipe and a double-wall inner pipe, wherein the double-wall outer pipe comprises an upper joint, a hanger, a double-wall inner pipe, an upper retaining ring I, an upper retaining ring II, a support ring I, a leather cup I, a pressing cap I, a support ring II, a leather cup II, a pressing cap II, a lower joint and a centralizer; wherein, a liquid inlet hole is arranged on the hanger, the upper part of the liquid flow double-wall conversion tool is in threaded connection with the oil pipe through an upper joint, the hanger is in a tubular structure and is positioned outside the inner pipe of the double-wall, an annular space is formed between the suspension device and the inner pipe of the double-wall, the upper ends of the suspension device and the inner pipe of the double-wall are both connected with an upper joint, a leather cup I and a leather cup II are sleeved outside the suspension device, the inner wall of the first leather cup is fixed on the hanger through the first supporting framework, the inner wall of the second leather cup is fixed on the hanger through the second supporting framework, the first pressing cap is installed at the bottom end of the first leather cup, the second pressing cap is installed at the lower end of the second leather cup, the upper end of the first supporting framework is connected with the first supporting ring, the upper end of the second supporting framework is connected with the second supporting ring, the outer wall of the hanger is further sleeved with a first upper retaining ring and a second upper retaining ring which are arranged side by side, the first upper retaining ring and the second upper retaining ring are blocked at the upper end of the first supporting ring, the lower end of the hanger is connected with a lower joint, and the outer wall of the lower joint is provided with a centralizer.

The differential pressure type choke packer comprises a choke seal upper joint, a choke seal upper part connecting piece, a choke seal inner pipe, a choke seal leather cup, a choke seal supporting framework, a choke seal pressure cap, a choke seal upper part pin, a choke seal spring, a choke seal fixing ring, a choke seal lower part connecting piece, a choke seal lower part pin and a choke seal lower joint, wherein the choke seal upper joint is in threaded connection with the lower joint of the liquid flow sandwich wall conversion tool, the upper end of the choke seal inner pipe is connected with the choke seal upper joint, the lower end of the choke seal inner pipe is connected with the choke seal lower joint, the choke seal spring and the choke seal leather cup are sleeved outside the choke seal inner pipe, the inner wall of the choke seal leather cup is fixed outside the choke seal inner pipe through the choke seal supporting framework, the upper end of the choke seal supporting framework is connected with the choke seal upper part connecting piece, the lower end of the choke seal leather cup is provided with the choke seal pressure, the upper end of the flow resisting seal spring is abutted against the lower end of the flow resisting seal pressure cap, the lower end of the flow resisting seal spring is abutted against the flow resisting seal fixing ring, the lower end of the flow resisting seal fixing ring is abutted against the flow resisting seal lower part connecting piece, and the flow resisting seal lower part connecting piece is fixed on the outer wall of the flow resisting seal lower connector through a flow resisting seal lower part pin.

The jet flow blockage removing tool comprises a coupling, a body, a nozzle and a sealing device, wherein the coupling is in threaded connection with the lower connector of the differential pressure type choke packer, the coupling is connected to the upper end of the body, the body is provided with the radial nozzle, the jet flow blockage removing tool is provided with a plurality of parts according to the length of an oil layer and is mutually connected with the differential pressure type choke packer, the jet flow blockage removing tool is matched for use, and only the jet flow blockage removing tool at the lowest part is provided with the sealing device which is arranged on the inner wall of the body.

The bottom pickling filling tool comprises a pickling filling outer pipe column and a pickling filling inner tool, the pickling filling outer pipe column comprises a buckle connector, a pickling filling outer tool, a pickling filling sliding sleeve outer tool, a pickling filling pressing cap, a positioning short section and a screwed plug, the upper end of the pickling filling inner tool is connected with an inner filling pipe, the lower end of the pickling filling inner tool extends into the pickling filling outer tool, the upper end of the pickling filling outer tool is connected with the buckle connector, the lower end of the pickling filling outer tool is connected with the pickling filling sliding sleeve outer tool, the pickling filling sliding sleeve is sleeved on the inner wall of the pickling filling outer tool and the inner wall of the pickling filling sliding sleeve outer tool, the pickling filling sliding sleeve seals a radial hole formed in the pickling filling outer tool, the lower end of the pickling filling outer tool is connected with the pickling filling pressing cap, the lower end of the pickling filling pressing cap is connected with the screwed plug, the pickling filling inner tool is provided with a first radial liquid flow port, the pickling filling pressure cap is provided with a second radial liquid flow port, and the buckle-changing joint is connected with an external sieve tube.

In order to achieve the purpose, the invention adopts the following technical scheme that the uniform jet flow blockage removal and filling integrated process method comprises the following steps:

c, pipe column descending: firstly, connecting an acid-washing filling outer pipe column with a sieve pipe and putting the acid-washing filling outer pipe column into a well; then, at least one group of unit modules formed by connecting a differential pressure type choke packer and a jet flow deblocking tool are put into the well and hung on the well mouth through an elevator, then an acid washing filling inner tool is connected with an inner filling pipe and put into the well, the well mouth is connected through an upper connector of a liquid flow double-wall conversion tool, meanwhile, an upper connector of the choke packer is connected with a lower connector of the liquid flow double-wall conversion tool, and then an inner pipe column and an outer pipe column are put into the well simultaneously;

acid washing process: the oil pipe gate is closed, acid liquor enters from the oil sleeve annulus and enters from the liquid inlet hole of the liquid flow double-wall conversion tool into the double-wall annulus, and because the jet flow blockage removing tool at the lowest part is provided with the sealing device, the acid liquor enters into an oil layer through the jet flow blockage removing tool, the uniform acid distribution of the acid liquor is realized by setting the number and the size of the jet flow blockage removing tool in advance, and simultaneously mud cakes are washed and loosened and stripped; opening an oil pipe gate, continuously injecting backwashing liquid, enabling the liquid to pass through a liquid flow wall-clamping conversion tool, a jet flow blockage removal tool, an oil layer, a liquid flow port II of a bottom acid washing filling tool, enter an inner filling pipe, and then return out of a well mouth through an oil pipe;

and (3) extrusion filling process: closing the casing gate, extruding the sand mixing liquid from the inside of the oil pipe, wherein the sand mixing liquid enters the stratum through the inner filling pipe and then through the liquid flow port II of the pickling filling tool at the bottom to realize extrusion filling;

and (3) a cyclic filling process: and opening the casing gate, extruding the sand mixing liquid from the inside of the oil pipe, enabling the sand mixing liquid to pass through the inner filling pipe, enter the screen pipe well section through the liquid flow port II of the bottom pickling filling tool, and return to the well mouth through the empty oil sleeve ring, so that circular filling is realized.

Compared with the prior art, the invention has the following beneficial effects:

the tubular column mainly comprises an outer tubular column for plugging removal and filling by uniform jet flow and an inner tubular column for plugging removal and filling by uniform jet flow. The uniform jet flow plug removal filling outer pipe column comprises an oil pipe, a double-wall outer pipe of a liquid flow double-wall conversion tool, a differential pressure type choke packer and a jet flow plug removal tool which are sequentially connected from top to bottom. The uniform jet flow blockage removal filling inner pipe column comprises a liquid flow double-wall inner pipe of a liquid flow double-wall conversion tool, and 2³/₈An in-filled filling tube and an acid-washing filled inner tool. The number of the jet flow blockage removing tools on the uniform jet flow blockage removing and filling outer pipe column is determined according to the length of the screen pipe section. The invention has the following beneficial effects:

(1) the construction of screen pipe jet flow, uniform acid cleaning and blockage removal of a near well, extrusion and sand prevention by circulating filling of a long well section of the horizontal well can be completed by one pipe column. (2) The process pipe column is provided with a plurality of jet flow blockage removal tools, the uniform acid distribution of an oil layer can be realized through the optimized design, and the blockage can be washed, so that the good blockage removal effect is ensured.

Drawings

FIG. 1 is a schematic structural diagram of a uniform jet flow blockage removal and filling integrated process pipe column of the invention;

in the figure: the flow double-wall conversion tool comprises a flow double-wall conversion tool 1, a differential pressure type flow blocking packer 2, a jet flow blockage removal tool 3, an inner filling pipe 4, a bottom acid washing filling tool 5, an open hole annulus 6, a cement ring 7, a sleeve 8 and an oil pipe 9.

FIG. 2 is a cross-sectional view of the configuration of the fluid flow double-walled conversion tool;

in the figure: the device comprises an upper joint 102, a hanger 103, a double-walled inner pipe 104, a liquid inlet hole 105, a first upper retaining ring 106, a second upper retaining ring 107, a first support ring 108, a leather cup 109, a first support framework 110, a first press cap 111, a second support ring 112, a second leather cup 113, a second support framework 114, a second press cap 115, a lower joint 116 and a centralizer 117.

FIG. 3 is a cross-sectional view of a differential choke packer construction;

in the figure: the choke seal comprises a choke seal upper joint 201, a choke seal upper connecting piece 202, a choke seal inner pipe 203, a choke seal leather bowl 204, a choke seal supporting framework 205, a choke seal pressing cap 206, a choke seal upper pin 207, a choke seal spring 208, a choke seal fixing ring 209, a choke seal lower connecting piece 210, a choke seal lower pin 211 and a choke seal lower joint 212.

FIG. 4 is a structural cross-sectional view of a jet unplugging tool;

in the figure: collar 301, body 302, nozzle 303, sealing device 304.

FIG. 5 is a structural cross-sectional view of a bottom acid pickling filling tool;

in the figure: the device comprises an inner pickling and filling tool 401, a first liquid flow port 402, a buckle joint 404, an outer pickling and filling tool 405, a pickling and filling sliding sleeve 406, an outer pickling and filling sliding sleeve tool 408, a second liquid flow port 407, a pickling and filling pressure cap 409, a positioning short section 410 and a plug 411.

Detailed Description

The detailed description and technical contents of the present invention are described below with reference to the accompanying drawings, which are, however, for reference and illustration purposes only and are not intended to limit the present invention.

According to the figures 1 to 5, the uniform jet flow blockage relieving and filling integrated process pipe column comprises a uniform jet flow blockage relieving and filling outer pipe column and a uniform jet flow blockage relieving and filling inner pipe column, wherein the uniform jet flow blockage relieving and filling outer pipe column comprises an oil pipe 9, a double-wall outer pipe of a liquid flow double-wall conversion tool, a differential choke packer 2 and a jet flow blockage relieving tool 3 which are sequentially connected from top to bottom, and the uniform jet flow blockage relieving and filling inner pipe column comprises a double-wall inner pipe of the liquid flow double-wall conversion tool, an inner filling pipe 4 and an acid washing and filling inner tool of a bottom acid washing and filling tool which are sequentially connected from top to bottom; the oil pipe is in threaded connection with an upper connector of the liquid flow double-wall conversion tool, a lower connector of the liquid flow double-wall conversion tool is connected with an upper flow blocking connector of a differential flow blocking packer, a lower connector of the differential flow blocking packer is connected with a coupling of a jet flow blockage removing tool, the upper portion of an inner filling pipe is connected with a double-wall inner pipe of the liquid flow double-wall conversion tool, the inner filling pipe penetrates through the differential flow blocking packer and the jet flow blockage removing tool, the lower portion of the inner filling pipe is connected with an acid washing filling inner tool of the bottom acid washing filling tool, the inner filling pipe, the differential flow blocking packer and the jet flow blockage removing tool sleeved outside form an annular space, and the bottom acid washing filling tool is connected with an external sieve pipe through a variable buckle connector of the bottom acid.

The differential pressure type choked flow packer 2 and the jet flow blockage removing tool 3 are arranged at intervals, and the number of the differential pressure type choked flow packer and the jet flow blockage removing tool is set according to the length of an oil layer well section. That is, the differential choke packer 2 and the jet unblocking tool 3 are connected to form a minimum unit module, and the unit modules may be one or 2 or 3 or more units connected in series.

The liquid flow double-wall conversion tool comprises a double-wall outer pipe and a double-wall inner pipe 104, wherein the double-wall outer pipe comprises an upper joint 102, a hanger 103, the double-wall inner pipe 104, a first upper retaining ring 106, a second upper retaining ring 107, a first support ring 108, a first leather cup 109, a support framework 110, a first press cap 111, a second support ring 112, a second leather cup 113, a second support framework 114, a second press cap 115, a lower joint 116 and a centralizer 117; wherein, the hanger is provided with a liquid inlet hole 105, the upper part of the liquid flow double-wall conversion tool is in threaded connection with an oil pipe through an upper joint, the hanger 103 is of a tubular structure, the hanger 103 is positioned outside the inner pipe of the double-wall, an annular space is formed between the hanger and the inner pipe of the double-wall, the upper joints are respectively connected with the upper ends of the hanger and the inner pipe of the double-wall, a leather cup I109 and a leather cup II 113 are sleeved outside the hanger 103, the inner wall of the leather cup I is fixed on the hanger through a supporting framework I, the inner wall of the leather cup II is fixed on the hanger through a supporting framework II, a pressing cap I111 is arranged at the bottom end of the leather cup I, a pressing cap II 115 is arranged at the lower end of the leather cup II, the upper end of the supporting framework is connected with a supporting ring I108, the upper end of the supporting framework is connected with a supporting ring II 112, the outer wall of the hanger 103 is further sleeved with an, the outer wall of the lower joint is provided with a centralizer 117.

The differential pressure type choke packer comprises a choke seal upper joint 201, a choke seal upper connecting piece 202, a choke seal inner tube 203, a choke seal leather cup 204, a choke seal supporting framework 205, a choke seal pressure cap 206, a choke seal upper pin 207, a choke seal spring 208, a choke seal fixing ring 209, a choke seal lower connecting piece 210, a choke seal lower pin 211 and a choke seal lower pin 212, wherein the choke seal upper joint is in threaded connection with a lower pin of a fluid clamp wall conversion tool, the upper end of the choke seal inner tube is connected with the choke seal upper joint, the lower end of the choke seal inner tube is connected with the choke seal lower pin, the choke seal spring and the choke seal leather cup are sleeved outside the choke seal inner tube, the inner wall of the choke seal leather cup is fixed outside the choke seal inner tube through the choke seal supporting framework, the upper end of the choke seal supporting framework is connected with the choke seal upper connecting piece, the lower end of the choke seal leather cup is provided with the choke seal pressure cap, and the choke seal, the upper end of the flow resisting seal spring is abutted against the lower end of the flow resisting seal pressure cap, the lower end of the flow resisting seal spring is abutted against the flow resisting seal fixing ring, the lower end of the flow resisting seal fixing ring is abutted against the flow resisting seal lower part connecting piece, and the flow resisting seal lower part connecting piece is fixed on the outer wall of the flow resisting seal lower connector through a flow resisting seal lower part pin.

The stifled instrument is separated to efflux includes coupling 301, body 302, nozzle 303, sealing device 304, coupling and differential choked flow packer lower clutch threaded connection, the coupling is connected to the body upper end, and radial nozzle is seted up to the body, the stifled instrument is separated to efflux sets up the several according to oil reservoir length to with differential choked flow packer interconnect, the cooperation is used, and only the stifled instrument of the efflux of lower part separates and just sets up sealing device, and this sealing device installs at the body inner wall.

The bottom pickling filling tool comprises a pickling filling outer pipe column and a pickling filling inner tool 401, the pickling filling outer pipe column comprises a buckle changing joint 404, a pickling filling outer tool 405, a pickling filling sliding sleeve 406, a pickling filling sliding sleeve outer tool 408, a pickling filling pressing cap 409, a positioning short section 410 and a plug 411, the upper end of the pickling filling inner tool is connected with an inner filling pipe, the lower end of the pickling filling inner tool extends into the pickling filling outer tool, the upper end of the pickling filling outer tool is connected with the buckle changing joint, the lower end of the pickling filling outer tool is connected with the pickling filling sliding sleeve outer tool, the inner wall of the pickling filling outer tool 405 and the inner wall of the pickling filling sliding sleeve outer tool are sleeved with the pickling filling sliding sleeve 406, the pickling filling sliding sleeve seals a radial hole formed in the pickling filling outer tool, the lower end of the pickling filling sliding sleeve outer tool is connected with the pickling filling pressing cap short section, the lower end of the pickling filling pressing cap is connected with, the pickling filling inner tool is provided with a first radial liquid flow port 402, the pickling filling pressure cap is provided with a second radial liquid flow port 407, and the variable buckle joint is connected with an external sieve tube.

The uniform jet flow blockage removal and filling integrated process method comprises the following steps of:

c, pipe column descending: firstly, connecting an acid-washing filling outer pipe column with a sieve pipe and putting the acid-washing filling outer pipe column into a well; then, the differential pressure type choke packer 2+ jet flow deblocking tool 3 is put into the well and hung on the well head through an elevator, then the acid washing filling inner tool 401 is connected with the inner filling pipe 4 and put into the well, the well head is connected through the upper joint 102 of the fluid flow double-wall conversion tool 1, meanwhile, the choke flow sealing upper joint 201 is connected with the lower joint 115 of the fluid flow double-wall conversion tool 1, and then the inner and outer pipe columns are put into the well simultaneously.

Acid washing process: the oil pipe gate is closed, acid liquor enters from the oil sleeve annulus and enters from the liquid inlet hole 105 of the liquid flow double-wall conversion tool into the double-wall annulus, and because the jet flow blockage removing tool at the lowest part is provided with the sealing device, the acid liquor enters into an oil layer through the jet flow blockage removing tool 3, the uniform acid distribution of the acid liquor is realized by setting the number and the size of the jet flow blockage removing tool 3 in advance, and simultaneously mud cakes are washed and loosened and stripped; and opening the oil pipe gate, continuously injecting backwashing liquid, enabling the liquid to pass through the jet flow blockage removing tool 3 and the oil layer from the liquid flow double-wall conversion tool 1, then entering the inner filling pipe 4 through the liquid flow port II 407 of the bottom pickling filling tool 5, and then returning out of the well mouth through the oil pipe.

And (3) extrusion filling process: closing the casing gate, extruding the sand mixing liquid from the inside of the oil pipe, wherein the sand mixing liquid passes through the inner filling pipe 4 and then enters the stratum through a liquid flow port II 407 of the bottom acid washing filling tool 5 to realize extrusion filling;

and (3) a cyclic filling process: and opening the casing gate, extruding the sand mixing liquid from the inside of the oil pipe, enabling the sand mixing liquid to pass through the inner filling pipe 4, enter the screen pipe well section through the liquid flow port II 407 of the bottom pickling filling tool 5, and return to the well mouth through the empty oil sleeve ring, so that circular filling is realized.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, but rather should be construed in all respects as illustrative and not restrictive.