阅读说明：本技术 一种固井水泥环封隔能力测试装置 (Well cementation cement sheath packing capacity testing device ) 是由 夏宏伟 缪云 唐诗国 辜涛 郑友志 唐思洪 焦利宾 王福云 青胜兰 付志 赵彬凌 于 2019-09-06 设计创作，主要内容包括：本发明公开了一种固井水泥环封隔能力测试装置,属于石油工程固井领域,一种固井水泥环封隔能力测试装置包括保护壳和上釜盖,上釜盖连接于保护壳上端,保护壳内壁上固定连接有保温层,保温层位于保护壳内侧,上釜盖内底端固定连接有内釜底盖,上釜盖下端固定连接有套管,套管下端与内釜底盖转动连接,套管外侧设置有模拟地层,套管与模拟地层之间设有水泥空腔,水泥空腔中填充有水泥环,将测试装置内部的模拟地层设置成两部分,测试结束后,只需要将两部分的模拟地层相互分离,即可将固化的水泥环轻易取出,可以很好的保护测试装置,延长测试装置的使用寿命。(The invention discloses a well cementation cement sheath packing capability test device, which belongs to the field of petroleum engineering well cementation and comprises a protective shell and an upper kettle cover, wherein the upper kettle cover is connected to the upper end of the protective shell, a heat preservation layer is fixedly connected to the inner wall of the protective shell and is positioned at the inner side of the protective shell, an inner kettle bottom cover is fixedly connected to the inner bottom end of the upper kettle cover, the lower end of the upper kettle cover is fixedly connected with a sleeve, the lower end of the sleeve is rotatably connected with the inner kettle bottom cover, a simulated stratum is arranged at the outer side of the sleeve, a cement cavity is arranged between the sleeve and the simulated stratum, a cement sheath is filled in the cement cavity, the simulated stratum in the test device is arranged into two parts, and after the test is finished, the, the solidified cement sheath can be taken out easily, the testing device can be well protected, and the service life of the testing device is prolonged.)

1. The utility model provides a well cementation cement sheath seals and separates ability testing arrangement which characterized in that: the testing device body comprises a protective shell (1) and an upper kettle cover (2), the upper kettle cover (2) is connected to the upper end of the protective shell (1), a heat preservation layer (3) is fixedly connected to the inner wall of the protective shell (1), the heat preservation layer (3) is positioned on the inner side of the protective shell (1), an inner kettle bottom cover (4) is fixedly connected to the inner bottom end of the upper kettle cover (2), a sleeve (5) is fixedly connected to the lower end of the upper kettle cover (2), the lower end of the sleeve (5) is rotatably connected with the inner kettle bottom cover (4), a simulation stratum (7) is arranged on the outer side of the sleeve (5), a cement cavity is arranged between the sleeve (5) and the simulation stratum (7), a cement ring (6) is filled in the cement cavity, the upper end of the simulation stratum (7) is slidably connected with the protective shell (1), the lower end of the simulation stratum (, threaded holes are correspondingly formed in the protective shell (1) and the heat preservation layer (3), a fastening rotary column (8) is arranged at the side end of the protective shell (1), and the end part of the fastening rotary column (8) penetrates through the threaded holes and is rotatably connected with the simulated stratum (7).

2. The well cementation cement sheath packing capability test device of claim 1, characterized in that: the simulated formation (7) is divided into two parts in the longitudinal axis direction, a pair of guide sliding grooves (9) are formed in the upper end of the inner kettle bottom cover (4), a guide sliding block (10) is fixedly connected to the lower end of the simulated formation (7), and the guide sliding block (10) is located in the guide sliding grooves (9) and is in sliding connection with the guide sliding grooves (9).

3. The well cementation cement sheath packing capability test device of claim 2, characterized in that: the guide sliding blocks (10) are located at one end, far away from the cement sheath (6), of the simulated stratum (7), and the distance between the end portions, close to each other, of the pair of guide sliding grooves (9) is larger than the outer diameter of the cement sheath (6) and is 1-2mm larger.

4. The well cementation cement sheath packing capability test device of claim 1, characterized in that: the special-shaped pipe groove (12) is cut in the center of the upper end of the inner kettle bottom cover (4), a pair of adaptation blocks (11) is fixedly connected to the lower end of the sleeve (5), and the adaptation blocks (11) are matched with the special-shaped pipe groove (12).

5. The well cementation cement sheath packing capability test device of claim 4, characterized in that: the casing pipe (5) is fixedly sleeved with an O-shaped limiting ring (13), the O-shaped limiting ring (13) is located on the upper side of the adapting block (11), and the diameter of the O-shaped limiting ring (13) is smaller than the inner diameter of the simulated stratum (7) by 0.5-0.8 mm.

6. the well cementation cement sheath packing capability test device of claim 1, characterized in that: the simulated stratum (7) side end is chiseled and is had spacing swivelling chute (15), fastening rotary column (8) tip fixedly connected with spacing disc (14), spacing disc (14) are located spacing swivelling chute (15) and rotate with spacing swivelling chute (15) and are connected.

7. The well cementation cement sheath packing capability test device of claim 6, characterized in that: the limiting rotary groove (15) is T-shaped, and the diameter of the limiting disc (14) is larger than that of the fastening rotary column (8) by 0.5-1 mm.

8. The well cementation cement sheath packing capability test device of claim 6, characterized in that: the end part of the limiting disc (14) is fixedly connected with a friction pad, and the friction pad is made of one of ethylene propylene rubber, fluorine rubber and perfluoro-ether rubber.

9. The well cementation cement sheath packing capability test device of claim 1, characterized in that: one end, far away from the protective shell (1), of the fastening rotary column (8) is wrapped with a heat insulation sleeve, and the heat insulation sleeve is made of high-temperature-resistant silica gel materials.

10. the well cementation cement sheath packing capability test device of claim 9, characterized in that: uneven stripes are engraved on the surface of the heat insulation sleeve, and the depth of the stripes is 1-1.5 mm.

Technical Field

The invention relates to the field of petroleum engineering well cementation, in particular to a well cementation cement sheath packing capacity testing device.

Background

The oil-gas well cementing operation refers to a process of forming a cement sheath with interlayer packing capacity by setting and curing cement slurry in an annular space between a lower casing and a stratum of an oil well cement injection well within a design time. The function of the cement sheath in the well is that the cement sheath plays an indispensable role in suspending and protecting the casing and prolonging the production period of the whole well besides the function of sealing and isolating the stratum.

However, the service environment of the cement sheath is very bad in the well. During actual field construction, working conditions such as eccentric casing, large-belly well bore, slurry mixing and uneven filling also have non-negligible influence on the performance of the cement sheath, and the difficult problem of guaranteeing the packing capacity of the well cementation cement sheath is further solved when severe and continuous load operation and impact of thermal stress occur. In the drilling process, the cement ring in the previous time is subjected to drill column collision, drilling fluid density change, sudden pressure increase and reduction brought by complex underground operation, casing pressure test and the like in the current drilling process; in the process of increasing production and solving production, load changes caused by operations such as perforation, acidification, fracturing, oil testing and the like all provide more serious challenges for the packing capacity of the cement sheath; in the production process, particularly in a high-temperature and high-pressure natural gas well, the temperature of an oil pipe can be gradually increased by continuously produced high-pressure gas, the temperature of working fluid filled in the annular space is increased more and more, the temperature rise of the liquid inevitably has an expansion effect, and the influence of the high-temperature expansion of the liquid on a well cementation cement sheath cannot be ignored.

In recent years, with the research on the packing capacity of a well cementing cement sheath, various scholars and institutions at home and abroad have introduced their own testing means and testing devices, such as: the cement sheath sealing integrity experimental device (SPE168321) can simulate the pressure and temperature change inside and outside the casing, directly observe whether micro cracks occur on the surface of the cement sheath, and carry out follow-up research by means of CT scanning; a cement sheath structural integrity mechanical experiment device (CN103498662A) is characterized in that a sheath cement sheath structure is maintained in a maintenance kettle in advance, and then the sheath cement sheath structure is placed in a test kettle to detect the integrity of a sheath-cement sheath assembly in an axial mechanical pressurization mode; a deepwater well cementation cement sheath packing performance testing device (CN103174409A) adopts different types of materials to simulate different strata, and a strain gauge is arranged on an instrument and used for measuring the strain of a cement sheath so as to calculate the stress and test the integrity of the cement sheath by changing the internal pressure of a sleeve; an indoor simulation test device (CN101725345A) for casing-cement sheath damage under the action of a stratum is used for maintaining an experimental sample in a simulator, placing the experimental sample in the simulator to simulate interlayer sliding, and detecting the displacement condition of the cement sheath sample through a strain gauge; a simulation experiment device and an experiment method (CN102979505A) for the performance of a well cementation cement sheath adopt a full-size simulation underground structure, adopt artificial surrounding rocks, are provided with inlets for injecting working fluid and can circulate different working fluids.

The test means and the test device try to reduce the actual load-bearing state of the cement sheath in the well to research the integrity problem of the cement sheath. However, the above-mentioned patent does not mention the operation of removing the cement sheath after the test is finished, and it is seen from the design of the above-mentioned patent that the cement sheath is very inconvenient to remove after curing, and the device is damaged by forced removal.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a well cementation cement sheath packing capacity testing device, which is characterized in that a simulated stratum inside the testing device is arranged into two parts, and after the test is finished, the solidified cement sheath can be easily taken out only by separating the simulated stratums of the two parts from each other, so that the testing device can be well protected, and the service life of the testing device is prolonged.

2. technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

A well cementation cement sheath packing capability test device comprises a test device body, wherein the test device body comprises a protective shell and an upper kettle cover, the upper kettle cover is connected to the upper end of the protective shell, a heat preservation layer is fixedly connected to the inner wall of the protective shell and is positioned on the inner side of the protective shell, an inner kettle bottom cover is fixedly connected to the inner bottom end of the upper kettle cover, a sleeve is fixedly connected to the lower end of the upper kettle cover, the lower end of the sleeve is rotatably connected with the inner kettle bottom cover, a simulation stratum is arranged on the outer side of the sleeve, a cement cavity is arranged between the sleeve and the simulation stratum, a cement sheath is filled in the cement cavity, the upper end of the simulation stratum is slidably connected with the protective shell, the lower end of the simulation stratum is slidably connected with the inner kettle, threaded holes are correspondingly formed in the protective shell and the heat preservation layer, a fastening rotary column is arranged at, the simulation stratum inside the testing device is set into two parts, and after the testing is finished, the solidified cement sheath can be taken out easily only by separating the simulation strata of the two parts from each other, so that the testing device can be well protected, and the service life of the testing device is prolonged.

Furthermore, the simulated formation is divided into two parts in the direction of the longitudinal axis, a pair of guide sliding grooves is formed in the upper end of the bottom cover of the inner kettle, guide sliding blocks are fixedly connected to the lower end of the simulated formation and located in the guide sliding grooves and connected with the guide sliding grooves in a sliding mode, after the test is finished, the fastening stud is unscrewed, and the fastening stud drives the pair of simulated formations to move away from each other along with the guide sliding blocks in a sliding mode along the guide sliding grooves, so that the simulated formations are separated from the cement ring.

Furthermore, the guide sliding block is positioned at one end, far away from the cement sheath, of the simulated stratum, the distance between the end parts, close to each other, of the pair of guide sliding grooves is larger than the outer diameter of the cement sheath and is 1-2mm larger, and therefore cement slurry cannot permeate into the guide sliding grooves in the process of injecting the cement slurry into the cement cavity.

Furthermore, the center of the upper end of the inner kettle bottom cover is provided with a special-shaped pipe groove, the lower end of the sleeve is fixedly connected with a pair of adaptation blocks, the adaptation blocks are matched with the special-shaped pipe groove, the adaptation blocks are aligned to the special-shaped pipe groove to insert the lower end of the sleeve into the special-shaped pipe groove, after the sleeve is rotated by a certain angle, the sleeve is fixed on the inner kettle bottom cover, and after the test is finished, the fastening stud is unscrewed, and the sleeve is rotated reversely to enable the adaptation blocks to be separated from the special-shaped pipe groove.

furthermore, an O-shaped limiting ring is fixedly sleeved on the sleeve, the O-shaped limiting ring is located on the upper side of the adapting block, the diameter of the O-shaped limiting ring is smaller than the inner diameter of the simulated stratum by 0.5-0.8mm, after the test is finished, the fastening stud is unscrewed, the sleeve is pulled upwards, the sleeve drives the O-shaped limiting ring to move upwards, and meanwhile, the cement ring is taken out upwards, so that the purpose of taking out the cement ring is achieved.

Furthermore, simulation stratum side end is excavated spacing swivelling chute, the spacing disc of fastening rotary column tip fixedly connected with, spacing disc is arranged in spacing swivelling chute and rotates with spacing swivelling chute and is connected, spacing swivelling chute is the T type form, the diameter of spacing disc is greater than the diameter of fastening rotary column, and big 0.5-1mm, and the spacing swivelling chute of T type form can be injectd spacing disc wherein for at the in-process of rotating the fastening rotary column, spacing disc can not break away from spacing swivelling chute, can take the stable outside removal of simulation stratum simultaneously.

Furthermore, the end part of the limiting disc is fixedly connected with a friction pad, the friction pad is made of one of ethylene propylene rubber, fluorine rubber and perfluoro-ether rubber, the temperature of the cement sheath can reach 130 ℃ in the process of testing the cement sheath, and the friction pad made of the three materials of the ethylene propylene rubber, the fluorine rubber and the perfluoro-ether rubber can bear 316 ℃ at most and 150 ℃ at least, so that scalding of the friction pad can be avoided.

Further, the one end parcel that the protective housing was kept away from to the fastening rotary column has the radiation shield, the radiation shield adopts high temperature resistant silica gel material, reduces the heat to outside transmission, can reduce the degree of generating heat of fastening rotary column tip simultaneously, avoids scalding the staff.

Furthermore, uneven stripes are engraved on the surface of the heat insulation sleeve, the depth of each stripe is 1-1.5mm, and the uneven stripes with certain depth can enhance the heat dissipation effect of the surface of the heat insulation sleeve.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) The test device has the advantages that the simulation stratum inside the test device is set into two parts, after the test is finished, the solidified cement sheath can be taken out easily only by separating the simulation strata of the two parts from each other, the test device can be well protected, and the service life of the test device is prolonged.

(2) the simulated formation is divided into two parts in the direction of a longitudinal axis, a pair of guide sliding grooves is formed in the upper end of the bottom cover of the inner kettle, the lower end of the simulated formation is fixedly connected with a guide sliding block, the guide sliding block is located in the guide sliding grooves and is in sliding connection with the guide sliding grooves, after the test is finished, the fastening stud is unscrewed, and the fastening stud drives the pair of simulated formations to slide along the guide sliding grooves and be away from each other, so that the simulated formation is separated from the cement ring.

(3) The guide sliding block is positioned at one end of the simulated stratum far away from the cement sheath, the distance between the end parts of the pair of guide sliding grooves close to each other is larger than the outer diameter of the cement sheath and is 1-2mm larger, and therefore cement paste cannot permeate into the guide sliding grooves in the process of injecting the cement paste into the cement cavity.

(4) The special-shaped pipe groove is dug in the center of the upper end of the inner kettle bottom cover, the lower end of the sleeve is fixedly connected with a pair of adaptation blocks, the adaptation blocks are matched with the special-shaped pipe groove, the adaptation blocks are aligned to the special-shaped pipe groove, the lower end of the sleeve is inserted into the special-shaped pipe groove, the sleeve is fixed on the inner kettle bottom cover after the test is finished, the fastening stud is unscrewed, and the sleeve rotates reversely to enable the adaptation blocks to be separated from the special-shaped pipe groove.

(5) The sleeve is fixedly sleeved with an O-shaped limiting ring, the O-shaped limiting ring is located on the upper side of the adapting block, the diameter of the O-shaped limiting ring is smaller than the inner diameter of the simulated formation and is 0.5-0.8mm smaller, after the test is finished, the fastening stud is unscrewed, the sleeve is pulled upwards, the sleeve drives the O-shaped limiting ring to move upwards, and meanwhile, the cement ring is taken out upwards, so that the purpose of taking out the cement ring is achieved.

(6) The simulation stratum side is excavated spacing swivelling chute, the spacing disc of fastening rotary column tip fixedly connected with, spacing disc is arranged in spacing swivelling chute and rotates with spacing swivelling chute and is connected, spacing swivelling chute is the T type form, the diameter of spacing disc is greater than the diameter of fastening rotary column, and big 0.5-1mm, the spacing swivelling chute of T type form can be injectd spacing disc wherein for at the in-process of rotating the fastening rotary column, spacing disc can not break away from spacing swivelling chute, can take the stable outside removal of simulation stratum simultaneously.

(7) The end part of the limiting disc is fixedly connected with a friction pad, the friction pad is made of one of ethylene propylene rubber, fluorine rubber and perfluoro-ether rubber, the temperature of the cement sheath can reach 130 ℃ in the process of testing the cement sheath, and the friction pad made of the three materials of the ethylene propylene rubber, the fluorine rubber and the perfluoro-ether rubber can bear 316 ℃ at most and 150 ℃ at least, so that scalding of the friction pad can be avoided.

(8) The one end parcel that the protective housing was kept away from to the fastening rotary column has the radiation shield sleeve, and the radiation shield sleeve adopts high temperature resistant silica gel material, reduces the heat to the transmission of outside, can reduce the degree of generating heat of fastening rotary column tip simultaneously, avoids scalding the staff.

(9) Uneven stripes are engraved on the surface of the heat insulation sleeve, the depth of each stripe is 1-1.5mm, and the uneven stripes with certain depth can enhance the heat dissipation effect of the surface of the heat insulation sleeve.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is a schematic view of the structure at A in FIG. 2;

FIG. 4 is a schematic view of the structure at B in FIG. 2;

FIG. 5 is a schematic structural view of the bottom cover of the inner kettle of the present invention;

FIG. 6 is a perspective view of the cannula of the present invention;

The reference numbers in the figures illustrate:

the device comprises a protective shell 1, an upper kettle cover 2, a heat preservation layer 3, an inner kettle bottom cover 4, a sleeve 5, a cement ring 6, a simulated stratum 7, a fastening rotary column 8, a guide sliding groove 9, a guide sliding block 10, an adapting block 11, a special-shaped pipe groove 12, an O-shaped limiting ring 13, a limiting disc 14 and a limiting rotary groove 15.

Detailed Description

the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.