Deepwater stratum microorganism cementing liquid cementing simulation evaluation device
By designing a microbial cementitious solution cementitious simulation evaluation device for deep water formation, the cementing process between microbial cementitious solution and formation in deep water environment is simulated, and the cementing effect is evaluated through interface shear testing, the problem of weak consolidation formation during deep water oil and gas well cementing process is solved, and the cementing quality and safety are improved.
Patent Information
- Application Number
- CN202422017372.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-19
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-19
AI Technical Summary
Deepwater oil and gas wells face weakly consolidated or unconsolidated formations during cementing, resulting in leakage and degumming during pump injection, affecting cementing quality and safety.
A deep-water formation microbial cementing solution cementing simulation evaluation device is designed, and the cementing effect evaluation component is simulated by simulating the formation pressure grouting mold, transforming grouting assembly and cementing effect evaluation component, the cementing process of the deep-water formation microbial cementing solution is simulated, and the cementing effect is evaluated through interface shear test.
The microbial cementing liquid cementing process under the real simulated formation pressure in a deep water environment was realized, the cementing effect was evaluated, the cementing quality of the second interface of the deep water formation cementing well was improved, and the safe mining of deep water oil wells was ensured.
Smart Images
Figure CN223037600U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oil and gas well cementing, in particular to a simulation evaluation device for microbial cementing fluid cementing in deep-water formations. Background Technique
[0002] As the main area of deep-water oil and gas in China, the South China Sea is rich in oil and gas resources, with reserves of 2.70 - 3.52×10^10 m³, accounting for more than 30% of China's oil and gas resources. Among them, the oil and gas resources in the deep-water area account for about 70%. The development prospect of China's deep-water oil and gas resources is broad. At present, the country has increased the exploration and development of large marine oil and gas fields, which is the top priority for ensuring China's energy security.
[0003] As an important guarantee for the safe and efficient exploitation of deep-water oil and gas, compared with onshore oil and gas wells, the primary problem faced by deep-water cementing is the weak or unconsolidated formations on the seabed. The formations penetrated by the wellbore are usually between the seabed and the mud line. The formation time of these formations is short, soft and uncemented, the formation fracture pressure gradient is low, and leakage is likely to occur during the process of cement slurry pumping. In addition, the strength difference between the deep-sea shallow surface layer and the cement sheath strength is large, and the cement sheath is prone to debonding from the formation, causing the underwater wellhead device to sink and leading to accidents. Besides the formation problems of the deep-sea shallow surface layer, in the environment of low temperature and high pressure on the seabed, it is easy to drill into hydrate formations. The hydrate formations in the sea area are not solidified and lithified, and the formations are mainly composed of fine-grained sediments such as silt, fine sand and muddy silt. It is difficult to form effective cementing with the cement sheath during the cementing process. At the same time, during the setting process of the cement slurry, the heat released by cement hydration will cause the decomposition of hydrates around the wellbore, further reducing the strength of the formations around the wellbore and deteriorating the cementing effect between the cement sheath and the formation, seriously affecting the cementing quality and causing potential safety hazards. Therefore, it is necessary to improve the cementing quality of deep-water weakly cemented formations to ensure safe and efficient production.
[0004] Existing studies, such as using mud cake curing, grouting cement slurry, epoxy resin, alkali-activated slag and geopolymers, etc., to reinforce the formations around the wellbore to improve the cementing quality. The mud cake curing method can effectively cement the cement sheath and the conventional formations, but for soft formations, the formed mud cake has little improvement in cementing strength. And the extensive use of chemical materials such as epoxy resin to consolidate the formations is likely to pollute the fragile deep-sea ecological environment. Grouting cement slurry and other gelling materials can effectively improve the strength of the formations around the wellbore, but the heat released during the condensation of the materials will cause the decomposition of hydrates in the hydrate formations, resulting in the risk of gas channeling. At the same time, the high-salt environment of seawater will erode materials such as cement, gradually reducing the strength of the consolidated formations. Therefore, it is necessary to seek an environmentally friendly and long-lasting way to reinforce soft formations to improve the cementing quality and ensure the long-term safe and efficient exploitation of marine oil and gas wells.
[0005] As an emerging geotechnical technology, Microbially Induced Carbonate Precipitation (MICP) has shown broad application prospects in the fields of geotechnical engineering, geological engineering, and petroleum engineering due to its characteristics such as environmental protection, high efficiency, and sustainability. At present, the application of MICP technology in the petroleum engineering field is mainly in the aspects of microbial self-repairing cement slurry for well cementing and consolidation and sand control in hydrate formations, and there are still few reports on improving the cementing quality of the second interface in marine soft formations. According to recent research, the MICP technology still has application potential in the seawater environment, and the shallow marine strata and hydrate layers have weak consolidation characteristics similar to loose sandy soil. Therefore, using the MICP technology to consolidate marine soft formations and improve the cementing quality of the second interface has good application prospects. This technology is of great significance for improving the cementing quality of marine oil and gas wells, ensuring the safe and efficient exploitation of marine oil and gas, and realizing the sustainable development of resources and the environment. However, at the present stage, the related research on the device for simulating the cementing of the second interface of the formation after treatment by using microorganisms to consolidate the formation and evaluating its cementing effect is almost in a blank stage. Summary of the Utility Model
[0006] The main object of the present utility model is to propose a simulation and evaluation device for cementing of microbial cementing liquid in deepwater formations, which can simulate the deepwater formation pressure environment, use the microbial cementing liquid to cement the formation, and evaluate the cementing effect.
[0007] To achieve the above object, a simulation and evaluation device for cementing of microbial cementing liquid in deepwater formations proposed by the present utility model includes:
[0008] A simulated formation pressure grouting mold, including a first cylinder body, a first fine screen, and a first end cap. The first cylinder body extends in the up and down direction, and a plurality of overflow holes are distributed along its circumferential side wall. The aperture of the overflow holes is greater than or equal to 1 mm and less than or equal to 2 mm. The first fine screen is sleeved inside the first cylinder body, and the inner side of the first fine screen is used to accommodate the formation sample to form a simulated formation annular rock sample. The first end cap is sealed at the bottom end of the first cylinder body through a first sealing ring;
[0009] A variable-pressure grouting assembly, including a frame hydraulic press, an air compressor, a grouting cylinder, a pressure regulating pump, and a second end cap. When simulating the cementing process of the microbial cementing liquid in deepwater formations, the frame hydraulic press accommodates and pressurizes the simulated formation pressure grouting mold. The pressure regulating pump is arranged between the air compressor and the grouting cylinder. The grouting cylinder is used to accommodate the microbial cementing liquid and is connected to the simulated formation pressure grouting mold. The second end cap is sealed at the top end of the first cylinder body; and,
[0010] A bonding effect evaluation component comprises a second cylinder, a third end cover and a compressive strength testing machine. The second cylinder, the third end cover and the simulated formation pressure grouting mold form a bonding effect evaluation mold. The second cylinder is extended in the up-down direction. The third end cover comprises a cover body and a press plate arranged in the middle of the cover body. The press plate can move in the up-down direction relative to the cover body. When assembling the bonding effect evaluation mold, the second cylinder is arranged at an interval on the inner side of the simulated formation annular rock sample, and the gap between the second cylinder and the simulated formation annular rock sample is used to accommodate cement slurry to form a cement ring. The third end cover is arranged at the top of the first cylinder, and the press plate is arranged corresponding to the cement ring. The compressive strength testing machine is used to act on the press plate to pressurize the cement ring to detect the maximum strength of the cement ring and the simulated formation annular rock sample when they are offset.
[0011] Optionally, the variable pressure grouting assembly further comprises a second fine gauze and a mesh screen. When simulating the cementing process of deep-water stratum microbial cementing fluid, the second fine gauze is sleeved in the simulated stratum annular rock sample, and the mesh screen is sleeved in the second fine gauze.
[0012] Optionally, the press platform includes a first pressurizing portion, a connecting portion and a second pressurizing portion, the connecting portion is arranged to penetrate the middle portion of the third end cover in the up-down direction, the first pressurizing portion is arranged at the top end of the connecting portion, the second pressurizing portion is arranged at the bottom end of the connecting portion, and the first pressurizing portion and the second pressurizing portion are both extended in the first direction;
[0013] At least one elastic member is disposed between one of the first pressurizing portion or the second pressurizing portion and the third end cover.
[0014] Optionally, a second sealing ring is provided between the second end cover and the first cylinder.
[0015] Optionally, the first end cover includes a main cover and a cushion block, and the cushion block is detachably mounted on the middle portion of the main cover.
[0016] Optionally, a third sealing ring is provided between the main cover and the gasket.
[0017] Optionally, the diameter of the overflow hole is greater than or equal to 1 mm and less than or equal to 2 mm.
[0018] In the technical solution of the present utility model, through the simulated formation pressure grouting mold and the variable pressure grouting assembly, the cementing process of the deep-water formation microbial cementing liquid under the simulated formation pressure can be truly simulated. Then, through the cementing effect evaluation assembly, an interface shear test can be carried out to obtain the maximum strength when the cement sheath and the simulated formation annular rock sample are staggered after grouting is completed for the simulated formation annular rock sample in the simulated formation pressure grouting mold. Based on this, the interface shear cementing strength is calculated, and further the cementing effect of the deep-water formation microbial cementing liquid is evaluated, thereby providing a basis for the engineering application of the microbial cementing liquid, playing a beneficial role in improving the cementing quality of the second interface of the deep-water formation cementing, and having important engineering significance for ensuring the safe exploitation of deep-water oil wells. Description of the Drawings
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0020] Figure 1 Partial structural schematic diagram of an embodiment of the deep-water formation microbial cementing liquid cementing simulation and evaluation device provided by the present utility model;
[0021] Figure 2 For Figure 1 Partial structural schematic diagram;
[0022] Figure 3 Partial structural schematic diagram of an embodiment of the deep-water formation microbial cementing liquid cementing simulation and evaluation device provided by the present utility model;
[0023] Figure 4 For Figure 1 Structural schematic diagram of the first end cap of the deep-water formation microbial cementing liquid cementing simulation and evaluation device in
[0024] Figure 5 For Figure 1 Structural schematic diagram of the second end cap of the deep-water formation microbial cementing liquid cementing simulation and evaluation device in
[0025] Figure 6 For Figure 3 Structural schematic diagram of the third end cap of the deep-water formation microbial cementing liquid cementing simulation and evaluation device in
[0026] Explanation of the reference numerals in the drawings:
[0027]
[0028]
[0029] The realization, functional features, and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners
[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0031] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.
[0032] In addition, if there are descriptions such as "first" and "second" involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.
[0033] Microbial-induced carbonate precipitation technology (MICP), as an emerging geotechnical technology, has shown broad application prospects in the fields of geotechnical engineering, geological engineering, and petroleum engineering due to its characteristics such as environmental protection, high efficiency, and sustainability. At present, the application of MICP technology in the petroleum engineering field is mainly in microbial self-repairing cement slurries for well cementing and consolidation and sand control in hydrate formations, and there are still few reports on improving the cementing quality of the second interface in marine soft formations. According to recent research, the MICP technology still has application potential in a seawater environment, and the shallow marine strata and hydrate layers have weak consolidation characteristics similar to loose sandy soils. Therefore, using the MICP technology to consolidate marine soft formations and improve the cementing quality of the second interface in well cementing has good application prospects. This technology is of great significance for improving the well cementing quality of marine oil and gas wells, ensuring the safe and efficient exploitation of marine oil and gas, and achieving the sustainable development of resources and the environment. However, at the present stage, the related research on the device for simulating the cementing of the second interface of the formation after microbial consolidation and evaluating its cementing effect is almost in a blank stage.
[0034] In view of this, the present utility model provides a simulation and evaluation device 100 for the cementing of microbial cementing liquid in deep-water formations. Figures 1 to 6 This is an embodiment of the simulation and evaluation device 100 for the cementing of microbial cementing liquid in deep-water formations provided by the present utility model.
[0035] Please refer to Figures 1 to 6The deepwater formation microbial cementing fluid cementing simulation evaluation device 100 comprises a simulated formation pressure grouting mold 1, a variable pressure grouting component 2 and a cementing effect evaluation component 3. The simulated formation pressure grouting mold 1 comprises a first cylinder 11, a first fine mesh 12 and a first end cover 13. The first cylinder 11 is extended in the up and down direction, and a plurality of overflow holes are distributed along its circumferential side wall. The aperture of the overflow hole is greater than or equal to 1 mm and less than or equal to 2 mm. The first fine mesh 12 is sleeved in the first cylinder 11, and the first fine mesh 12 The inner side is used to accommodate the formation sample 200 to form a simulated formation annular rock sample. The first end cover 13 is sealed to the bottom end of the first cylinder 11 through the first sealing ring 14; the variable pressure grouting assembly 2 includes a frame hydraulic press 21, an air compressor 22, a grouting barrel 23, a pressure regulating pump 27 and a second end cover 24. When simulating the cementing process of deep-water formation microbial cementing fluid, the frame hydraulic press 21 contains and pressurizes the simulated formation pressure grouting mold 1, the pressure regulating pump 27 is arranged between the air compressor 22 and the grouting barrel 23, and the grouting barrel 23 is used to accommodate The microbial cementing liquid is placed in the mold 1 for grouting with simulated formation pressure, and the second end cover 24 is sealed at the top of the first cylinder 11; the cementing effect evaluation component 3 includes a second cylinder 31, a third end cover 32 and a compressive strength testing machine, the second cylinder 31, the third end cover 32 and the simulated formation pressure grouting mold 1 form a cementing effect evaluation mold, the second cylinder 31 is extended in the up and down direction, the third end cover 32 includes a cover body 321 and a pressing platform 322 arranged in the middle of the cover body 321, and the pressing platform 322 can be relative to the The cover body 321 moves in the up and down directions. When assembling the bonding effect evaluation mold, the second cylinder 31 is arranged at an interval on the inner side of the simulated formation annular rock sample, and the gap between the second cylinder 31 and the simulated formation annular rock sample is used to accommodate cement slurry to form a cement ring 33. The third end cover 32 is arranged at the top of the first cylinder 11, and the pressing platform 322 is arranged corresponding to the cement ring 33. The compressive strength testing machine is used to act on the pressing platform 322 to pressurize the cement ring 33 to detect the maximum strength of the cement ring 33 and the simulated formation annular rock sample when they are offset.
[0036] In the technical solution of the present utility model, through the simulated formation pressure grouting mold 1 and the variable-pressure grouting assembly 2, the cementing process of the deep-water formation microbial cementing liquid under the simulated formation pressure can be truly simulated. Then, through the cementing effect evaluation assembly 3, an interface shear test can be carried out to obtain the maximum strength when the cement ring 33 and the simulated formation annular rock sample are staggered after the grouting of the simulated formation annular rock sample in the simulated formation pressure grouting mold 1. Based on this, the interface shear cementing strength can be calculated, and further the cementing effect of the deep-water formation microbial cementing liquid can be evaluated, so as to provide a basis for the engineering application of the microbial cementing liquid, which is beneficial to improving the cementing quality of the second interface of the deep-water formation cementing and has important engineering significance for ensuring the safe exploitation of deep-water oil wells.
[0037] In addition, in the present utility model, when simulating the cementing process of the deep-water formation microbial cementing liquid, through the first fine screen 12, it is possible to prevent the formation sample 200 from flowing out of the first cylinder 11 along with the microbial cementing liquid during the grouting process. At the same time, by setting the first sealing ring 14, the sealing performance of the first end cap 13 can be improved.
[0038] It should be noted that in an embodiment of the present utility model, when simulating the cementing process of the deep-water formation microbial cementing liquid, by applying pressure to the first end cap 13 and the second end cap 24 through the frame hydraulic press 21, pressure can be applied to the simulated formation annular rock sample in the simulated formation pressure grouting mold 1. In this way, by adjusting the magnitude of the pressure applied by the frame hydraulic press 21, the pressure exerted by the formation at different sea depths can be simulated. At the same time, the grouting cylinder 23 is connected to the second end cap 24 through a pipeline, so as to realize the injection of the microbial cementing liquid.
[0039] It should also be noted that in an embodiment of the present utility model, the pressure regulating range of the pressure regulating pump 27 is 0 - 10 MPa, and the pressure increasing range of the frame hydraulic press 21 is 0 - 30 MPa.
[0040] In addition, it should be noted that in an embodiment of the present utility model, the inner diameter of the first cylinder 11 is 150 mm.
[0041] Further, please refer to Figure 1 and Figure 2, the variable pressure grouting assembly 2 further includes a second fine screen 25 and a screen 26. When simulating the cementation process of the microbial cementation liquid in the deep water formation, the second fine screen 25 is sleeved inside the simulated formation annular rock sample, and the screen 26 is sleeved inside the second fine screen 25. In this way, by setting the second fine screen 25, it is avoided that the formation sample 200 flows into the inner side of the screen 26 along with the microbial cementation liquid, that is, flows into the gap between the second cylinder body 31 of the cementation effect evaluation mold assembled later and the simulated formation annular rock sample; and by setting the screen 26, it can be ensured that the simulated formation annular rock sample remains in a cylindrical state after the grouting is completed.
[0042] It should be noted that, in an embodiment of the present invention, the aperture of the screen holes of the screen 26 is 1 mm, and the inner diameter of the screen 26 is 120 mm.
[0043] Specifically, please refer to Figure 3 and Figure 6 , the pressing platform 322 includes a first pressing part 3221, a connecting part 3222 and a second pressing part 3223. The connecting part 3222 is arranged through the middle part of the third end cover 32 in the up and down direction. The first pressing part 3221 is arranged at the top end of the connecting part 3222, and the second pressing part 3223 is arranged at the bottom end of the connecting part 3222, and both the first pressing part 3221 and the second pressing part 3223 extend along the first direction; at least one elastic member 323 is arranged between one of the first pressing part 3221 and the second pressing part 3223 and the third end cover 32. In this way, the pressing platform 322 can be reset through the elastic member 323 after the cement ring 33 is pressurized.
[0044] It should be noted that, in an embodiment of the present invention, the diameter of the second pressing part 3223 is 120 mm, so that the second pressing part 3223 only fits with the cement ring 33 during the pressurization process.
[0045] Furthermore, in the present invention, the setting form of the elastic member 323 is not limited, and it can be a spring or rubber, etc. More specifically, please refer to Figure 3 , in an embodiment of the present invention, the elastic member 323 is a spring.
[0046] Specifically, a second sealing ring 28 is arranged between the second end cover 24 and the first cylinder body 11; in this way, the sealing performance of the second end cover 24 is improved through the second sealing ring 28.
[0047] It should be noted that, in the present invention, the above two technical features can be set alternatively or simultaneously. Specifically, please refer to Figures 1 to 3In one embodiment of the utility model, the above two technical features are provided at the same time, that is, a first sealing ring 14 is provided between the first end cover 13 and the first cylinder 11, and a second sealing ring 28 is provided between the second end cover 24 and the first cylinder 11. In this way, the sealing effect during the test is improved, and the cementation process of deep-water formation microbial cementing fluid under formation pressure is truly simulated, thereby improving the accuracy of the test results.
[0048] For details, please refer to Figures 1 to 4 , the first end cover 13 includes a main cover 131 and a cushion block 132, and the cushion block 132 is detachably mounted on the middle part of the main cover 131. In this way, when simulating the cementing process of the microbial cementing fluid in the deep water formation, the cushion block 132 is mounted on the main cover 131 to complete the injection of the microbial cementing fluid; and in the process of the cementing strength test, the cushion block 132 is disassembled to prevent the cement ring 33 from interfering with the cushion block 132 and being unable to stagger with the simulated formation sample when the press table 322 acts on the cement ring 33 through the compressive strength tester, that is, by disassembling the cushion block 132, the press table 322 can press the cement ring 33 out of the first cylinder 11.
[0049] For further information, see Figures 1 to 3 A third sealing ring 15 is provided between the main cover 131 and the cushion block 132 , thereby improving the sealing effect.
[0050] Specifically, in an embodiment of the present invention, the diameter of the overflow hole is greater than or equal to 1 mm and less than or equal to 2 mm, which can ensure that the microbial cementing liquid can flow out of the first cylinder 11.
[0051] The utility model also provides a method for using the deep-water stratum microbial cementing fluid cementing simulation evaluation device, which is applicable to the deep-water stratum microbial cementing fluid cementing simulation evaluation device described above, and comprises the following steps:
[0052] Step S1, assemble the first cylinder, the first fine mesh and the first end cover to form a simulated formation pressure grouting mold, fill the formation sample between the first cylinder and the first fine mesh to form a simulated formation sample, and then cover the second end cover on the top of the first cylinder.
[0053] Furthermore, the step S1 specifically includes:
[0054] Step S11, configuring the formation sample.
[0055] In this step, muddy silt or fine sand is used to prepare the formation sample.
[0056] Step S12: Assemble the first cylinder, the first fine screen, the first end cap, the second fine screen, and the sieve to form a simulated formation pressure grouting mold.
[0057] In this step, the first fine screen is sleeved inside the first cylinder, the second fine screen is sleeved inside the first fine screen at intervals, then the sieve is sleeved inside the second fine screen, and then the first end cap is covered on the bottom end of the first cylinder.
[0058] Step S13: Fill the formation sample between the first fine screen and the second fine screen to form the simulated formation specimen, and cover the second end cap on the top end of the first cylinder.
[0059] Step S2: Place the simulated formation pressure grouting mold with the second end cap covered into a frame hydraulic press, and apply pressure to the simulated formation pressure grouting mold through the frame hydraulic press, and inject the microbial cementing liquid into the simulated formation specimen in the simulated formation pressure grouting mold through an air compressor and a grouting cylinder.
[0060] In this step, pressure is applied to the first end cap and the second end cap through the frame hydraulic press, that is, pressure is applied to the simulated formation specimen in the simulated formation pressure grouting mold to simulate the pressure received by the formation at different sea depths.
[0061] It should be noted that in this step, a pressure regulating pump can be set between the air compressor and the grouting cylinder, the air compressor supplies pressure to the pressure regulating pump, and the pressure of the pressure regulating pump can be set to a preset pressure for experiments.
[0062] Step S3: After grouting and curing are completed, take out the simulated formation pressure grouting mold and remove the second end cap.
[0063] It should be noted that in this step, after grouting is completed, turn off the air compressor, cure the simulated formation specimen for 3 days, and clean the grouting cylinder at the same time.
[0064] Step S4: Place a second cylinder into the simulated formation specimen, and inject cement slurry into the gap between the second cylinder and the simulated formation specimen to form a cement ring.
[0065] It should be noted that in this step, before placing the second cylinder, first take out the second fine screen and the sieve.
[0066] It should also be noted that the second cylinder is placed in the middle without damaging the integrity of the simulated formation specimen.
[0067] Step S5: Take out the second cylinder body, place the third end cap on the top of the first cylinder body, and make the pressing platform arranged in the middle of the third end cap correspond to the cement ring, so as to form a cementing effect evaluation mold.
[0068] It should be noted that in this step, after the cement ring solidifies, take out the cushion block of the first end cap to avoid the cement ring that will be pressed out of the first cylinder body by the pressing platform subsequently.
[0069] Step S6: Use a compressive strength testing machine to apply pressure to the cementing effect evaluation mold until the cement ring is displaced from the simulated formation sample.
[0070] It should be noted that in this step, the compressive strength testing machine slowly applies pressure to the cementing effect evaluation mold.
[0071] Step S7: Calculate the interfacial shear bonding strength between the cement ring and the simulated formation.
[0072] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims
1. A deepwater formation microbial cementing fluid cementing simulation evaluation device, characterized in that: The deepwater formation microbial cementing fluid cementing simulation evaluation device comprises: A simulated formation pressure grouting mold, comprising a first cylinder, a first fine mesh and a first end cover, wherein the first cylinder is extended in the up-down direction and has a plurality of overflow holes distributed along its circumference on its circumferential side wall, the first fine mesh is sleeved in the first cylinder, and the inner side of the first fine mesh is used to accommodate a formation sample to form a simulated formation annular rock sample, and the first end cover is sealed to the bottom end of the first cylinder by a first sealing ring; A variable pressure grouting assembly, comprising a frame type hydraulic press, an air compressor, a grouting barrel, a pressure regulating pump and a second end cover. When simulating the cementing process of deep-water stratum microbial cementing fluid, the frame type hydraulic press contains and pressurizes the simulated formation pressure grouting mold, the pressure regulating pump is arranged between the air compressor and the grouting barrel, the grouting barrel is used to contain the microbial cementing fluid and is connected to the simulated formation pressure grouting mold, and the second end cover is sealed at the top of the first barrel; and A bonding effect evaluation component comprises a second cylinder, a third end cover and a compressive strength testing machine. The second cylinder, the third end cover and the simulated formation pressure grouting mold form a bonding effect evaluation mold. The second cylinder is extended in the up-down direction. The third end cover comprises a cover body and a press plate arranged in the middle of the cover body. The press plate can move in the up-down direction relative to the cover body. When assembling the bonding effect evaluation mold, the second cylinder is arranged at an interval on the inner side of the simulated formation annular rock sample, and the gap between the second cylinder and the simulated formation annular rock sample is used to accommodate cement slurry to form a cement ring. The third end cover is arranged at the top of the first cylinder, and the press plate is arranged corresponding to the cement ring. The compressive strength testing machine is used to act on the press plate to pressurize the cement ring to detect the maximum strength of the cement ring and the simulated formation annular rock sample when they are offset.
2. The deepwater stratum microbial cementing fluid cementing simulation evaluation device according to claim 1, characterized in that: The variable pressure grouting assembly also includes a second fine gauze and a mesh screen. When simulating the cementing process of deep-water stratum microbial cementing fluid, the second fine gauze is sleeved in the simulated stratum annular rock sample, and the mesh screen is sleeved in the second fine gauze.
3. The deepwater stratum microbial cementing fluid cementing simulation evaluation device according to claim 1, characterized in that: The press platform comprises a first pressurizing portion, a connecting portion and a second pressurizing portion, wherein the connecting portion is arranged to penetrate the middle portion of the third end cover in the up-down direction, the first pressurizing portion is arranged at the top end of the connecting portion, the second pressurizing portion is arranged at the bottom end of the connecting portion, and the first pressurizing portion and the second pressurizing portion are both extended in the first direction; At least one elastic member is disposed between one of the first pressurizing portion or the second pressurizing portion and the third end cover.
4. The deepwater stratum microbial cementing fluid cementing simulation evaluation device according to claim 1, characterized in that: A second sealing ring is provided between the second end cover and the first cylinder.
5. The deepwater stratum microbial cementing fluid cementing simulation evaluation device according to claim 1, characterized in that: The first end cover includes a main cover and a cushion block, and the cushion block is detachably mounted on the middle part of the main cover.
6. The deepwater stratum microbial cementing fluid cementing simulation evaluation device according to claim 5, characterized in that: A third sealing ring is provided between the main cover and the cushion block.
7. The deepwater stratum microbial cementing fluid cementing simulation evaluation device according to claim 1, characterized in that: The diameter of the overflow hole is greater than or equal to 1 mm and less than or equal to 2 mm.