CN211453181U - Well cementation set cement capability test device - Google Patents
Well cementation set cement capability test device Download PDFInfo
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- CN211453181U CN211453181U CN202020099791.9U CN202020099791U CN211453181U CN 211453181 U CN211453181 U CN 211453181U CN 202020099791 U CN202020099791 U CN 202020099791U CN 211453181 U CN211453181 U CN 211453181U
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Abstract
The utility model relates to an oil and gas exploration field discloses a well cementation set cement capability test device, including interior sleeve pipe and outer tube, interior sleeve pipe cover is established at the outer tube inside and including between sleeve pipe and the outer tube form toroidal cavity, still includes the base, the below of sleeve pipe and outer tube including the base setting to the bottom of sealed toroidal cavity. When the cement slurry is used, cement slurry is injected into the annular cavity and then cured to form the well cementation cement stone, and the whole sample is very simple to manufacture. After the set cement is formed, the inner tube is extruded by using a press machine, so that the inner tube and the set cement sample move relatively to calculate the cementing strength of the first surface of the set cement, and the whole testing process is in a direct extrusion mode without clamping the set cement sample or the inner sleeve. Meanwhile, according to the actual working conditions of the high-temperature high-pressure gas well, the influence of continuous pressure change caused by working conditions such as fracturing on the sealing failure of the cement sheath is simulated, and the performance of the cement sheath is quantitatively evaluated through the gas permeability change of the cement sheath.
Description
Technical Field
The utility model relates to an oil and gas exploration and development field, concretely relates to well cementation set cement capability test device.
Background
As exploration and development move toward deep formations, well cementing projects face increasingly more serious challenges and problems. The requirements on the integrity of the cement sheath are higher and higher under the conditions of high temperature, high pressure, high acidity, complex load and the like. The well cementation engineering is an important link in well drilling operation and is a key for ensuring normal operation of the follow-up operation in the well, and the strength of a cementing surface of well cementation can directly influence the effective development of an oil-gas well.
Along with the increasing of complex wells and special wells, the requirement on the integrity of a cement sheath is higher and higher, and the method is particularly important for testing the breaking strength of a cementing surface of a well cementation.
At present, most devices for testing the strength of a cementing surface of a well cementation have complex structures, and CN109342195A discloses a method for testing the cementing strength of a first cementing surface of oil well cement, which comprises the following steps: (1) manufacturing a simulation casing-cement sheath combined structure sample; (2) and vertically placing the simulation casing pipe-cement sheath combined structure sample, clamping two ends of the simulation casing pipe-cement sheath combined structure sample on a hydraulic tensile testing machine, and then starting to test the bonding strength.
The method has the advantages that the sample manufacturing process is complex, the sample needs to be clamped on a hydraulic tensile testing machine for experiment during testing, the operation is inconvenient, and the difference between the sample size and the actual sleeve is large.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem how to provide a well cementation set cement capability test device, make sample preparation and cementation strength test more simple, convenient, reliable.
The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a well cementation set cement capability test device, includes interior sleeve pipe and outer tube, interior sleeve pipe cover is established the outer tube is inside and interior sleeve pipe with form the toroidal cavity between the outer tube, still include the base, the base sets up interior sleeve pipe with the below of outer tube, and sealed the bottom of toroidal cavity.
The utility model has the advantages that: firstly, the utility model discloses a well cementation set cement capability test device has simulated structure in the pit, and interior sleeve pipe is oil pipeline promptly, and the outer tube is the oil well inner wall promptly. In the using process, according to a standard cement paste preparation mode, cement paste is prepared according to a cement paste formula, the cement paste is injected between the inner sleeve and the outer sleeve to form an annular cavity, then the cement paste is cured to form well cementation cement stones, and the preparation of the whole sample is very simple. After forming the set cement, directly use the press as a whole with interior sleeve pipe, outer tube and set cement sample to extrude the inner tube for inner tube and set cement sample take place relative motion, and wherein, the pressure that takes place relative motion and the area of contact of set cement sample and interior sleeve pipe's ratio is exactly the cementation intensity of the first face of set cement, and whole test procedure is through direct extruded mode, does not need centre gripping set cement sample or interior sleeve pipe, and test procedure is very simple effective.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the inner sleeve and the outer sleeve are coaxially arranged.
The beneficial effect of adopting the further scheme is that: the thickness of the cement sample is ensured to be consistent, and the cement sample is consistent with the environment of cement in the well.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Furthermore, the base is provided with a through hole, the through hole is positioned below the inner sleeve, and the aperture of the through hole is larger than the outer diameter of the inner sleeve.
The beneficial effect of adopting the further scheme is that: the through hole on the base is arranged below the inner sleeve, and the aperture of the through hole is larger than the outer diameter of the inner sleeve; when carrying out the cementation strength test, need not be with the help of extra frock, directly place testing arrangement and extrude the test on the press, when interior sleeve pipe is extruded and is come off, get into the through-hole, convenient test.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Furthermore, the bottom of the inner sleeve is sealed, and hot oil is arranged in the inner sleeve.
The beneficial effect of adopting the further scheme is that: the hot oil in the inner sleeve can simulate the actual environmental conditions of the underground well fluid, so that the formation of the cement stone sample is consistent with the underground use conditions, and the accuracy of the cement stone sample cementing strength test is improved.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Furthermore, a heating device and a temperature sensor are arranged in the hot oil, and the heating device and the temperature sensor are connected with a temperature control device.
The beneficial effect of adopting the further scheme is that: because the temperatures of the underground well fluid are different at different depths, the temperature of the hot oil in the inner casing is controlled, so that the temperatures of different well fluids can be simulated, and the accuracy of cement stone sample preparation is ensured.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the base with be provided with high temperature resistant elastic ring between the ring cavity, the base with interior sleeve pipe with outer tube fixed connection still including being used for sealing the annular seal upper cover on ring cavity's upper portion, the base be equipped with the base pressurization hole that the ring cavity switches on and be used for surveying the pressure sensor of ring cavity internal pressure, the annular seal upper cover also be provided with the upper cover pressurization hole that the ring cavity switches on, be used for surveying the pressure sensor of ring cavity internal pressure and the flow sensor who is used for testing flow in the ring cavity.
The beneficial effect of adopting the further scheme is that: through the setting, the gas permeability of the cement stone sample can be tested, and the performance of the cement stone sample can be further evaluated.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Furthermore, a sealing cap is arranged at the upper part of the inner sleeve, the heating device and the temperature sensor penetrate through the sealing cap to be connected with the temperature control device, and the sealing cap is also provided with an inner sleeve pressurizing hole communicated with the annular cavity.
The beneficial effect of adopting the further scheme is that: the destruction level of the cement sample under the circulating pressure condition is evaluated by circularly pressurizing the inner sleeve.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the annular sealing upper cover and the outer sleeve are connected in a sealing mode through threads, and the base and the outer sleeve are connected in a sealing mode through threads.
The beneficial effect of adopting the further scheme is that: through threaded sealing connection, the reliability of connection is improved, and the accuracy of testing is ensured when gas permeability testing and circulating pressure testing are carried out.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the annular sealing upper cover is provided with an upper cover annular boss, the base is provided with a base annular boss, and the cover annular boss and the base annular boss extend into the annular cavity and are sealed with the annular cavity through a sealing ring.
The beneficial effect of adopting the further scheme is that: the sealing reliability is ensured by the sealing connection between the boss and the annular cavity.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the sealing ring is a plurality of.
The beneficial effect of adopting the further scheme is that: the multiple sealing rings form multi-layer sealing, and further ensure the sealing reliability.
Drawings
FIG. 1 is a cross-sectional view of an embodiment of the present invention;
FIG. 2 is a schematic representation of the bond strength test of a cement sample according to one embodiment;
FIG. 3 is a cross-sectional view of a second embodiment of the present invention;
fig. 4 is a three-sectional view of the embodiment of the present invention;
fig. 5 is a four-sectional view of an embodiment of the present invention;
FIG. 6 is a graphical representation of the gas permeability and degree of cyclic internal stress versus set cement failure for the four test examples;
fig. 7 is a five-sectional view of an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
01. the device comprises an inner sleeve, 011, hot oil, 02, an outer sleeve, 03, an annular cavity, 04, a base, 041, an annular boss of the base, 042, a base pressurizing hole, 05, a cement stone sample, 06, a testing platform, 07, a high-temperature resistant elastic ring, 08, a heating device, 09, an annular sealing upper cover, 091, an upper cover pressurizing hole, 092, a pressure sensor, 093, a sealing ring, 10, a sealing cover cap, 101, an inner sleeve pressurizing hole, 11, a fixing hole, 12 and a shearing boss.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
The embodiment of the present invention provides a cross-sectional view as shown in fig. 1.
The utility model provides a well cementation set cement capability test device, includes interior sleeve pipe 01 and outer tube 02, and interior sleeve pipe 01 cover is established inside outer tube 02 and forms annular cavity 03 between interior sleeve pipe 01 and outer tube 02, still includes base 04, and the below of sleeve pipe 01 and outer tube 02 including base 04 setting to the bottom of sealed annular cavity 03.
The working principle of the embodiment is as follows: firstly, the utility model discloses a well cementation set cement capability test device has simulated structure in the pit, and interior sleeve pipe 01 is oil pipeline promptly, and outer tube 02 is the oil well inner wall promptly. In the using process, according to a standard cement paste preparation mode, cement paste is prepared according to a cement paste formula, the cement paste is injected into an annular cavity 03 formed between the inner sleeve 01 and the outer sleeve 02, then the well cementation set cement sample 05 is formed through maintenance, and the whole sample is very simple to manufacture. After forming set cement sample 05, directly use the press to extrude the inner tube as a whole with interior sleeve pipe 01, outer tube 02 and set cement sample 05 for inner tube and set cement sample 05 take place relative motion, and wherein, the pressure that takes place relative motion and set cement sample 05 and the area of contact of interior sleeve pipe 01's ratio is exactly the cementation intensity of the first face of set cement, and whole test procedure is through the mode of direct extrusion, does not need centre gripping set cement sample 05 or interior sleeve pipe 01, and test procedure is very simple effective.
Example a cement sample test bond strength schematic diagram referring to fig. 2, an inner sleeve 01, an outer sleeve 02 and a cement stone sample 05 are directly placed on a pressure workbench of a press as a whole, so that the inner sleeve 01 is pressed downwards in a space where the inner sleeve 01 moves downstream, and when the inner sleeve 01 moves, a pressure reading F of the press is recorded, and then the bond strength of the cement stone sample 05 is calculated.
The cement slurry of the set cement sample 05 of the embodiment comprises the following components in parts by mass: 100 parts of G-grade cement; 3 parts of a filtrate reducer; 3 parts of elastoplast agent; 0.5-1 part of a dispersant; 0.2 part of defoaming agent; and 40 parts of water. The cement stone maintenance conditions are as follows: 90 ℃ 72hr 20.7Mpa, test parameter F average 1812KN, and surface area S of inner casing wrapped by cement sample 05 of 0.1536m2The bonding strength B of the first bonding surface of the cements＝F/S＝11.8MPa。
In the present embodiment, the inner sleeve 01 and the outer sleeve 02 are coaxially disposed. Thus, the thickness of the cement sample 05 is consistent, and the thickness is consistent with the underground environment of cement; also, in practice, the base may be adjusted to properly offset the axes of the inner casing 01 and outer casing 02, depending on the particular downhole conditions.
In particular embodiments, the spacing of the toroidal cavities 03 (i.e., the thickness of the cement sample 05) may be configured and selected according to the particular implementation.
The embodiment of the utility model provides a two cross sectional views refer to fig. 3, and base 04 is equipped with the through-hole, and the through-hole is located the below of interior sleeve pipe 01, and its aperture is greater than the external diameter of interior sleeve pipe 01. The bottom of the inner sleeve 01 is sealed, and hot oil 011 is arranged in the inner sleeve 01. A high-temperature resistant elastic ring 07 is arranged between the base 04 and the annular cavity 03, the base 04 is provided with a base annular boss 042, and the base annular boss 042 extends into the annular cavity 03.
The through hole on the base 04 is arranged below the inner sleeve 01, and the aperture of the through hole is larger than the outer diameter of the inner sleeve 01; when carrying out the cementation strength test, need not be with the help of extra frock, directly place testing arrangement and extrude the test on the press, when interior sleeve pipe 01 was extruded and is come off, get into the through-hole, convenient test.
Meanwhile, in the embodiment, the bottom of the inner sleeve 01 is sealed, and hot oil 011 is arranged in the inner sleeve 01. The hot oil 011 in the inner sleeve 01 can simulate the actual environmental conditions of the underground well fluid, ensure that the formation of the set cement sample 05 is consistent with the underground use conditions, and improve the accuracy of the cementing strength test of the set cement sample 05.
In the manufacturing process of the cement sample in this embodiment, a support and a spacer are placed at the through hole of the base 04 to ensure that the inner sleeve 01 does not move downward during the cement curing process.
The embodiment of the utility model provides a three section views refer to fig. 4, compare with the embodiment three-phase, and its difference lies in, is equipped with heating device 08 and temperature sensor in the hot oil 011, and heating device 08 and temperature sensor link to each other with temperature control device.
Because the temperatures of the downhole well fluid are different at different depths, the temperature of the hot oil 011 in the inner casing 01 is controlled, so that the temperatures of different well fluids can be simulated, and the accuracy of preparing the cement stone sample 05 is ensured.
In this embodiment, the heating device 08 and the temperature sensor (not shown in the drawings) are provided together, reducing the number of parts of the device.
The embodiment of the utility model provides a four cut-away views refer to fig. 5, be provided with high temperature resistant elastic ring 07 between base 04 and the ring cavity 03, base 04 and interior sleeve 01 and outer tube 02 fixed connection, still including the sealed upper cover 09 of annular space that is used for sealing the upper portion of ring cavity 03, base 04 is equipped with the base pressurization hole 042 that switches on with ring cavity 03 and is used for surveying the pressure sensor 092 of ring cavity 03 internal pressure, also be provided with the upper cover pressurization hole 091 that switches on with ring cavity 03 on the sealed upper cover 09 of annular space and be used for surveying the pressure sensor 092 of ring cavity 03 internal pressure to and the flow sensor (not shown in the figure) that is used for testing flow in the ring cavity.
In this embodiment, after the maintenance of the cement sample 05 is completed, the high temperature resistant elastic ring 07 is taken out, nitrogen is injected from the base pressurizing hole 042, and the gas permeability is calibratedQuasi-test mode-Darcy's law, recording the stable pressure P of base pressure hole 0421Stable pressure P of upper cover pressurizing hole 0910And stabilizing gas flow rate Q, cement height h, sectional area A and other parameters, selecting nitrogen viscosity coefficient mu, and calculating initial gas permeability k ═ mu × Q (P)1 2-P0 2)/(2*h*A*P0). In one specific example of this embodiment, the gas permeability k is measured by a set cement specimen<10mD, and the permeability of the set cement meets the requirement.
In particular embodiments, the permeability of the fluid may also be tested to evaluate the permeability effect of the set cement sample. Other types of gases may also be used in conducting the gas permeability test.
In this embodiment, the upper portion of the inner sleeve 01 is provided with a sealing cap 10, the heating device 08 and the temperature sensor are connected with the temperature control device through the sealing cap 10, and the sealing cap 10 is further provided with a pressurizing hole of the inner sleeve 01 communicated with the annular cavity 03.
And circularly pressurizing the inside of the inner sleeve 01 through the inner sleeve 01 pressurizing hole to evaluate the damage degree of the cement stone sample 05 under the circulating pressure condition.
One specific implementation in this embodiment is: the cement stone sample is circularly pressurized for 10 times through the inner sleeve 01 pressurizing hole, the maximum pressure value is 100MPa, the upper cover pressurizing hole 091 is kept open in the pressurizing process, and one of the specific parameters in the embodiment is as follows: 180mD, which indicates that the set cement generates micro-crack channels, so that the set cement fails.
In the embodiment, the pressurizing pressure value and the cycle number of the inner sleeve and the cement centralization degree can be adjusted according to the actual well completion design so as to simulate the cement stress condition as accurately as possible.
In this embodiment, the annular sealing upper cover 09 and the outer sleeve 02 are connected in a sealing manner by screw threads, and the base 04 and the outer sleeve 02 are connected in a sealing manner by screw threads. Through threaded sealing connection, the reliability of connection is improved, and the accuracy of testing is ensured when gas permeability testing and circulating pressure testing are carried out.
In this embodiment, the annular sealing upper cover 09 has an upper cover annular boss, the base 04 is provided with a base annular boss 042, and the cover annular boss and the base annular boss 042 extend into the annular cavity 03 and are sealed with the annular cavity 03 by the sealing ring 093. The boss is connected with the annular cavity 03 in a sealing mode, and therefore sealing reliability is guaranteed.
In this embodiment, two seal rings 093 are provided on each boss. By means of double-layer sealing, the sealing effect is further ensured, and the tested parameters are more accurate.
In this embodiment, a plurality of fixing holes 11 are provided on the base 04 to ensure that the entire testing device is fixed during testing.
Example four schematic diagrams for testing gas permeability and degree of damage of cyclic internal stress to set cement are shown in fig. 6, that is, after maintenance of a set cement sample 05 is completed, hot oil 011 is drawn out from an inner sleeve 01, nitrogen is injected from a base pressurizing hole 042, pressure variation and flow variation of the base pressurizing hole 042 and an upper cover pressurizing hole 091, and parameters such as height and surface area of the set cement are recorded according to a standard gas permeability test mode, and initial gas permeability is calculated.
In testing the level of failure of the cement stone sample 05 under cyclic pressure conditions, also after curing of the cement stone sample 05, hot oil 011 is withdrawn from the inner casing 01. Nitrogen is injected from the base pressurizing hole 042, and the inner sleeve 01 pressurizing hole circularly pressurizes the inner sleeve 01, so that the damage degree of the cement stone sample 05 under the circulating pressure condition is evaluated.
The embodiment of the utility model provides a five cross sectional views refer to fig. 7, in order to ensure at the cement stone sample 05 manufacture in-process, interior sleeve pipe 01 is convenient for control, do not move down, can set up one at through-hole department and cut boss 12, it sets up on base 04 through-hole internal surface to cut boss 12, its bulge is in order to support interior sleeve pipe 01, the shearing force of cutting boss 12 is greater than 350kg power and can ensures that interior sleeve pipe 01 can not move down in cement stone sample preparation and maintenance in-process, the shearing force of cutting boss 12 is less than interior sleeve pipe 01 cementation thrust, be less than 1000kg power promptly and just can not influence the test of cement stone sample cementation intensity. Therefore, the cementing strength can be directly tested after the maintenance of the cement sample 05 is finished, and the method is very convenient. In the present embodiment, the shear boss 12 has an annular shape.
In particular embodiments, the shear boss 12 may be constructed of a plurality of small bosses.
The above description is only for the preferred embodiment of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. The utility model provides a well cementation set cement capability test device, includes interior sleeve pipe and outer tube, its characterized in that, interior sleeve pipe cover is established the outer tube is inside and interior sleeve pipe with form the toroidal cavity between the outer tube, still include the base, the base sets up interior sleeve pipe with the below of outer tube, and seal the bottom of toroidal cavity.
2. The well cementation set cement performance test device of claim 1, characterized in that: the inner sleeve and the outer sleeve are coaxially arranged.
3. The well cementation set cement performance test device of claim 2, characterized in that: the base is provided with a through hole, the through hole is positioned below the inner sleeve, and the aperture of the through hole is larger than the outer diameter of the inner sleeve.
4. A well cementing cement stone performance test device according to any one of the claims 1 to 3, characterized in that: the bottom of the inner sleeve is sealed, and hot oil is arranged in the inner sleeve.
5. The well cementation set cement performance test device of claim 4, characterized in that: and a heating device and a temperature sensor are arranged in the hot oil, and the heating device and the temperature sensor are connected with a temperature control device.
6. A well cementation set cement performance test device according to claim 5, characterized in that: the base with be provided with high temperature resistant elastic ring between the ring cavity, the base with interior sleeve pipe with outer tube fixed connection still including being used for sealing the sealed upper cover of annular space on annular cavity's upper portion, the base be equipped with the base pressurization hole that the annular cavity switches on and be used for surveying the pressure sensor of annular cavity internal pressure, the sealed upper cover of annular space also be provided with the upper cover pressurization hole that the annular cavity switches on, be used for surveying the pressure sensor of annular cavity internal pressure and the flow sensor who is used for testing flow in the annular cavity.
7. The well cementation set cement performance test device of claim 6, characterized in that: the upper part of the inner sleeve is provided with a sealing cap, the heating device and the temperature sensor penetrate through the sealing cap to be connected with the temperature control device, and the sealing cap is also provided with an inner sleeve pressurizing hole communicated with the annular cavity.
8. A well cementation set cement performance test device according to claim 6 or 7, characterized in that: the annular sealing upper cover is connected with the outer sleeve in a thread fixing and sealing mode, and the base is connected with the outer sleeve in a thread fixing and sealing mode.
9. The well cementation set cement performance test device of claim 8, characterized in that: the annular sealing upper cover is provided with an upper cover annular boss, the base is provided with a base annular boss, and the cover annular boss and the base annular boss extend into the annular cavity and are sealed with the annular cavity through a sealing ring.
10. A well cementation set cement performance test device according to claim 9, characterized in that: the sealing washer is a plurality of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020099791.9U CN211453181U (en) | 2020-01-16 | 2020-01-16 | Well cementation set cement capability test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020099791.9U CN211453181U (en) | 2020-01-16 | 2020-01-16 | Well cementation set cement capability test device |
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| CN211453181U true CN211453181U (en) | 2020-09-08 |
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| CN202020099791.9U Active CN211453181U (en) | 2020-01-16 | 2020-01-16 | Well cementation set cement capability test device |
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Address after: 610000 No.2 workshop, No.200, Checheng East Fifth Road, Chengdu Economic and Technological Development Zone (Longquanyi District), Sichuan Province Patentee after: Sichuan Weitai Kechuang Petroleum Equipment Manufacturing Co.,Ltd. Address before: 610000 Chengdu Economic and Technological Development Zone (Longquanyi District), Sichuan Province Patentee before: Sichuan Weitai Kechuang Petroleum Equipment Manufacturing Co.,Ltd. |