CN210604342U - Cement bond strength in-situ testing device for simulating high-temperature and high-pressure underground working condition - Google Patents
Cement bond strength in-situ testing device for simulating high-temperature and high-pressure underground working condition Download PDFInfo
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- CN210604342U CN210604342U CN201921521707.1U CN201921521707U CN210604342U CN 210604342 U CN210604342 U CN 210604342U CN 201921521707 U CN201921521707 U CN 201921521707U CN 210604342 U CN210604342 U CN 210604342U
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Abstract
The utility model provides a simulation high temperature high pressure downhole operating mode set cement cementation strength normal position testing arrangement, the device mainly includes: the device comprises a sealing kettle cover, a sealing kettle body, a top column, a movable base, a sleeve, a sealing cover plate, a heating and heat-insulating device, a sensor, an acquisition control system and the like. The utility model discloses utilize sealed cauldron simulation operating mode in the pit, form cement maintenance chamber through sealed apron, movable base and sleeve pipe, cement is maintained in the maintenance intracavity, and after the maintenance, carry out the work of cemented strength test of set cement, obtain data on the power-displacement curve that acquisition control system shows to this data calculates the cemented strength that obtains set cement under the high temperature high pressure condition as the basis. The utility model discloses can test the cementitious performance of cement stone under the operating mode in the simulation well under original condition under, provide technical support for preferred well cementation grout, improvement well cementation quality.
Description
Technical Field
The utility model relates to a well cementation technical field in oil and the natural gas development process, concretely relates to well cementation set cement cementation strength testing arrangement.
Background
One of the purposes of oil and gas well cementing is to effectively seal the outer annular space of the casing and prevent the formation fluid from channeling in the processes of oil and gas well drilling, production increasing operation and production. In the well cementation process, cement slurry is an important material for sealing the annular space between the casing and the well wall, the cement slurry is finally solidified under the underground high-temperature and high-pressure environment to form cement stones with certain cementing capacity between the well wall and the casing, and the cementing strength directly influences the space packing degree, so how to test the cementing strength of the cement stones and enable the cement stones to meet the requirements is the key point to be considered in the well cementation process.
In the currently disclosed devices for testing the cementing strength of cement stones in laboratories, most experimenters are required to fill cement slurry into annular spaces of a simulation casing pipe and a simulation oil pipe, the whole maintenance device is maintained for a period of time under specified conditions, after maintenance is finished, the maintenance device is disassembled, a pressure test is carried out by a press machine, and the pressure when the cement stones on an inner ring interface and an outer ring interface are peeled off is respectively recorded, so that the cementing strength is obtained, such as a cementing strength testing device (CN 105422080A). However, there is a limitation in this operation process, for example, if the cured cement stone is placed in an indoor condition, there is a risk that the structure or strength of the cement stone changes, so that a certain error is generated in the cement strength test result.
To this condition, the utility model provides a simulation high temperature high pressure is operating mode set cement cementation intensity normal position testing arrangement in pit to for selecting high-quality grout in the well cementation operation, improving the well cementation quality and providing technical support.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art, provide a simulation high temperature high pressure downhole operating mode set cement cementation intensity normal position test's novel device, be convenient for select the quality grout in high temperature high pressure well cementing operation.
The utility model discloses a realize through following technical scheme: the utility model provides a simulation high temperature high pressure downhole condition set cement bond strength normal position testing arrangement, includes: sealing kettle, grout curing means and cementation intensity testing arrangement.
The utility model provides a pair of simulation high temperature high pressure downhole operating mode set cement bond strength normal position testing arrangement's sealed cauldron mainly includes: the sealing kettle comprises a sealing kettle cover, a sealing kettle body, a fixing bolt gasket, a rubber sealing gasket, a top column, an upper nut, an upper gasket, an upper gland, an upper packing box, a movable base, a lower nut, a lower gasket, a lower gland, a lower packing box, an air inlet, an air outlet, an upper groove and a lower groove. The sealing kettle cover is fixed on the sealing kettle body through the fixing bolt, the fixing bolt applies pressure to compress the rubber sealing gasket between the sealing kettle cover and the sealing kettle body, and the existence of the gasket can further improve the sealing performance of the experimental device. There is the upper groove at the sealed kettle lid center, after screwing the upper nut, the upper nut can press a top packing ring, the gland is gone up in the upper washer extrusion, packing in the extrusion then, make the hanging wall root hold tightly the fore-set, through the upper nut, the upper packing ring, it is fixed with hanging wall root to assist the fore-set, the existence of going up the packing not only has the effect of fixed fore-set, also can carry out the certain degree to the device and seal, there is the low groove at sealed kettle body bottom center, through the lower nut, lower packing ring, lower gland and packing down carry out the auxiliary fixation to movable base, sealed kettle body bottom has the lower packing box, packing down is equipped with, packing is pressed down to the pushing down lid, make the lower packing hold tightly movable base, thereby realize the sealed to sealed kettle body bottom. The bottom of the sealing kettle body is provided with an air inlet, and the sealing kettle cover is provided with an air outlet.
The utility model provides a pair of simulation high temperature high pressure downhole operating mode set cement bond strength normal position testing arrangement's grout curing means mainly includes: the outer barrel, the sleeve, the sealing cover plate, the movable base, the upper rubber sealing element and the lower rubber sealing element. The urceolus is placed in sealed cauldron body bottom, and the sleeve pipe is fixed in the urceolus, and movable base is fixed in the low groove at sealed cauldron body bottom center, and movable base and intraductal wall of casing overlap mutually, and upper rubber seal inlays on intraductal wall of casing, and movable base cover has lower floor's rubber seal, and sleeve pipe, sealed apron and movable base form the cement maintenance chamber for deposit the grout.
The utility model provides a pair of simulation high temperature high pressure downhole operating mode set cement cementation strength normal position testing arrangement's cementation strength testing arrangement mainly includes: the device comprises a sleeve, a sealing cover plate, a top column, an upper nut, an upper gasket, a movable base, a lower nut, a lower gasket, an upper layer rubber sealing element, a lower layer rubber sealing element, a heating and heat-insulating device, a temperature sensor, a pressure sensor and an acquisition control system. After cement maintenance is finished, the nut is unscrewed to enable the movable base to move downwards, then the nut is screwed, an external device is used for applying force to the top column, the top column moves downwards, the sealing cover plate is pressed against, the sealing cover plate then presses against the set cement, relative sliding between the set cement and the inner wall of the sleeve pipe is achieved, the force applied by the top column is collected by the pressure sensor, mechanical data are transmitted to the collection control system by the pressure sensor, and the cementing strength of the set cement is calculated on the basis of the data.
Must notice, a simulation high temperature high pressure downhole condition set cement cementation intensity normal position testing arrangement, the assembly, before fixed, need paint the butter to the contact surface between the essential element, including sealed apron, the contact surface between upper rubber seal spare and the interior wall of sleeve pipe, movable base, the contact surface between lower floor's rubber seal spare and the interior wall of sleeve pipe, the seal pot lid, the contact surface between rubber seal gasket and the seal pot body, on the one hand, can improve the sealing performance between each contact surface, on the other hand, also can prevent to appear gluing between movable base and the interior wall of sleeve pipe among the grout coagulation process glutinous, be convenient for carry out moving down of the movable base of cementation intensity test during operation.
The utility model has the advantages that:
(1) the cement bond strength can be tested in situ under the simulated underground working condition, and the risk that the structure or the strength of the cement bond is changed when the cement bond is transferred from the maintenance environment to the indoor environment is eliminated.
(2) The high-temperature and high-pressure environment can be formed by the sealing kettle and the heating and heat-insulating device, the cementing performance of the cement stone under the condition of preset temperature and pressure is tested, and technical support is provided for optimizing well cementing cement slurry and improving the well cementing quality.
Drawings
FIG. 1 is a schematic view of the device provided by the present invention for cement slurry coagulation maintenance;
FIG. 2 is a schematic view of the device provided by the present invention for testing the cementing strength of cement stones;
FIG. 3 is a schematic view of the junction of a sealing kettle cover, a top column, an upper nut, an upper gasket, an upper gland and an upper disc root;
FIG. 4 is a schematic view of the joint of the sealing kettle body, the movable base, the lower gland, the lower base, the lower nut and the lower gasket;
FIG. 5 is a schematic diagram illustrating the dimensions of the sealing cover plate, the sleeve, the outer cylinder and the movable base;
fig. 6 is a schematic diagram of a curve displayed by the acquisition control system during the bond strength test.
Detailed Description
The following is combined with the example to carry out detailed explanation on the main realization principle, the specific implementation mode and the corresponding beneficial effects that can be achieved according to the technical scheme of the utility model:
example 1
The embodiment discloses an in-situ testing method for simulating cement bond strength under high-temperature and high-pressure downhole working conditions, which comprises the following steps of:
firstly, coating HM hydraulic oil on a contact surface of an upper packing (14) and a top column (9) and a contact surface of a lower packing (21) and a movable base (16), storing a certain amount of HM hydraulic oil in an upper storage cavity (13) and a lower storage cavity (20), placing the lower packing (21) in a lower packing box (22) at the bottom of a sealed kettle body (2), placing a lower gland (19) above the lower packing (21), then sleeving the movable base (16) to the bottom of the sealed kettle body (2), engraving threads on the movable base (16), and performing auxiliary fixing on the movable base (16) through a lower nut (17), a lower gasket (18), a lower gland (19) and the lower packing (21) to ensure that the movable base (16), the lower nut (17), the lower gland (19) and the central line of the sealed kettle body (2) are superposed, and keeping the distance between the movable base (16) and the bottom of the sealed kettle body (2) to be 9mm, so that the movable base (16) moves downwards when the cementing strength test is carried out;
step two, selecting a sleeve (7) with the inner diameter D of 5cm, embedding an upper rubber sealing element (23) on the inner wall of the sleeve (7), sleeving the sleeve (7) and a movable base (16) and placing the sleeve at the bottom of a sealing kettle body (2), sleeving an outer cylinder (6) outside the sleeve (7) to achieve the effect of fixing the sleeve (7), paying attention to the fact that the center lines of the outer cylinder (6), the sleeve (7) and the movable base (16) are overlapped, measuring to obtain the distance from the upper rubber sealing element (23) to the upper surface of the movable base (16) to be 6cm, and taking the distance as the height h of the cement stone sample;
pouring the prepared cement paste A into the casing (7), paying attention to the fact that a stirring rod needs to be used for continuously inserting and smashing the cement paste when the cement paste is poured, bubbles generated during stirring are carefully removed, the cement paste is compact and uniform, the height of the upper liquid level of the cement paste is required to be kept to be consistent with that of an upper rubber sealing piece (23) on the inner wall of the casing (7), the sealing cover plate (8) is placed inside the casing (7), and the upper rubber sealing piece (23) is embedded in the inner wall of the casing (7), so that the sealing cover plate (8) can be just clamped at the height of the upper rubber sealing piece (23), namely above the upper liquid level of the cement paste, and the purpose of sealing the cement curing cavity (31) is achieved;
fourthly, placing an upper packing (14) with lubricant in an upper storage cavity (13) in an upper packing box (15) of the sealing kettle cover (1), placing an upper gland (12) above the upper packing (14), then sleeving the top column (9) into the center of the sealing kettle cover (1), sleeving the upper gasket (11) above the upper gland (12), overlapping the top column (9), the upper nut (10) and the upper gland (12) with the central line of the sealing kettle cover (1), screwing the upper nut (10) to enable the upper gasket (11) to press the upper gland (12), enabling the upper gland (12) to press the upper packing (14) immediately, and enabling the upper packing (14) to tightly hold the top column (9) in a pressing state so as to achieve the functions of fixing the top column (9) and sealing, paying attention to the fact that the top column (9) needs to be adjusted to a proper height to enable the sealing kettle cover (1) to be connected with the sealing kettle body (2), the distance between the sealing cover plate (8) and the top column (9) is kept at 18 mm;
adding simulated formation water, paying attention to calculating the quantity of the simulated formation water in advance to enable the height of the simulated formation water to be just higher than that of a sealing cover plate (8), then placing a rubber sealing gasket (5) coated with butter in a groove of a sealing kettle body (2), placing a sealing kettle cover (1) sleeved with a top column (9) above the sealing kettle body (2), tightening a fixing bolt (3), fastening the sealing kettle cover (1) on the sealing kettle body (2), connecting a temperature sensor (28), the sealing kettle body (2), a heating and heat-preserving device (27) and an acquisition control system (30) through signal lines, connecting a pressure sensor (29), the top column (9) and the acquisition control system (30) through the signal lines, starting the acquisition control system (30), enabling the heating and heat-preserving device (27) to operate and heat, keeping the cement paste curing condition that the pressure is 18MPa and the temperature is 80 ℃, the curing time is 24 hours;
step six, after cement maintenance is finished, screwing down the nut (17) to enable the movable base (16) to move downwards, then screwing up the nut (10), applying force to the jacking column (9) by an external device to enable the jacking column (9) to move downwards at a constant speed, keeping the speed at 2mm/min, enabling the acquisition control system (30) to keep a data acquisition period of 5s, recording the force when the jacking column (9) starts to move on a curve generated by the acquisition control system (30), and recording the force as the friction force F between the jacking column (9) and a device partf3264N;
step seven, collecting FfThen, the ejection column (9) continues to move at a constant speed, so that the ejection column (9) pushes the sealing cover plate (8), the sealing cover plate (8) then pushes the set cement until the set cement in the casing (7) and the inner wall of the casing (7) slide relatively, and the maximum force F when the relative sliding between the set cement and the inner wall of the casing (7) occurs is acquired from a curve generated by the acquisition control system (30)max29169N;
and step eight, after the test work is finished, calculating according to the collected pressure data and the formula (1) to obtain the cementing strength M of the set cement A and the casing (7) to be 2.75 MPa.
In the formula: fmaxIs the maximum force when relative sliding occurs between the set cement and the inner wall of the casing (7), N; ffIs the friction between the top post (9) and the device part, N; pi is 3.14; d is the inner diameter of the sleeve (7) in mm; h is the height of the cement stone sample, mm; m is the cementing strength of the set cement, MPa.
Example 2
The embodiment discloses an in-situ testing method for simulating cement bond strength under high-temperature and high-pressure downhole working conditions, which comprises the following steps of:
repeating the first step to the fifth step of the example 1, wherein the cement slurry A is replaced by cement slurry B, the inner diameter D of the sleeve (7) is 5cm, the distance from the upper layer rubber sealing element (23) to the upper surface of the movable base (16) is measured to be 6.5cm, the height h is regarded as the height h of the cement stone sample, the distance between the movable base (16) and the bottom of the sealing kettle body (2) is 9mm, when the sealing kettle cover (1) is connected with the sealing kettle body (2), the distance between the sealing cover plate (8) and the top column (9) is kept to be 18mm, the cement slurry maintenance condition is changed into 20MPa of pressure and 90 ℃, and the maintenance time is 24 hours;
step six, after cement maintenance is finished, screwing down the nut (17) to enable the movable base (16) to move downwards, then screwing up the nut (10), applying force to the jacking column (9) by an external device to enable the jacking column (9) to move downwards at a constant speed, keeping the speed at 2mm/min, enabling the acquisition control system (30) to keep a data acquisition period of 5s, recording the force when the jacking column (9) starts to move on a curve generated by the acquisition control system (30), and recording the force as the friction force F between the jacking column (9) and a device partfIs 3929N;
step seven, collecting FfThen, the ejection column (9) continues to move at a constant speed, so that the ejection column (9) pushes the sealing cover plate (8), the sealing cover plate (8) then pushes the set cement until the set cement in the casing (7) and the inner wall of the casing (7) slide relatively, and the maximum force F when the relative sliding between the set cement and the inner wall of the casing (7) occurs is acquired from a curve generated by the acquisition control system (30)max36993N;
and step eight, after the testing work is finished, calculating according to the collected pressure data and the formula (1) to obtain the cementing strength M of the set cement B and the casing (7) to be 3.24 MPa.
In the formula: fmaxIs the maximum force when relative sliding occurs between the set cement and the inner wall of the casing (7), N; ffIs the friction between the top post (9) and the device part, N; pi is 3.14; d is the inner diameter of the sleeve (7) in mm; h is the height of the cement stone sample, mm; m is the cementing strength of the set cement, MPa.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; while the present invention has been described in detail with reference to the foregoing examples, it will be understood by those skilled in the art that; it is also possible to modify the solution described in the preceding examples or to substitute equally some or all of its technical features; such modifications and substitutions do not depart from the spirit and scope of the exemplary embodiments of the present invention.
Claims (5)
1. The utility model provides a simulation high temperature high pressure downhole condition set cement bond strength normal position testing arrangement which characterized in that: the device consists of a sealing kettle, a cement paste maintenance device and a cementing strength testing device;
the sealing kettle consists of a sealing kettle cover (1), a sealing kettle body (2), a fixing bolt (3), a fixing bolt gasket (4), a rubber sealing gasket (5), a top column (9), an upper nut (10), an upper gasket (11), an upper gland (12), an upper packing (14), an upper packing box (15), a movable base (16), a lower nut (17), a lower gasket (18), a lower gland (19), a lower packing (21), a lower packing box (22), an air inlet (25), an air outlet (26), an upper groove (32) and a lower groove (33), wherein the sealing kettle cover (1) is fixed on the sealing kettle body (2) through the fixing bolt (3), and the fixing bolt (3) applies pressure to tightly press the rubber sealing gasket (5) between the sealing kettle cover (1) and the sealing kettle body (2); an upper groove (32) is formed in the center of the sealing kettle cover (1), and the top column (9) is fixed in the upper groove (32) in an auxiliary mode through an upper nut (10), an upper gasket (11), an upper gland (12) and an upper disc root (14); a lower groove (33) is formed in the center of the bottom of the sealing kettle body (2), and the movable base (16) is fixed in the lower groove (33) through a lower nut (17), a lower gasket (18), a lower gland (19) and a lower disc root (21) in an auxiliary mode; the bottom of the sealing kettle body (2) is provided with an air inlet (25), and the sealing kettle cover (1) is provided with an air outlet (26);
the cement paste curing device consists of an outer cylinder (6), a sleeve (7), a sealing cover plate (8), a movable base (16), an upper rubber sealing element (23) and a lower rubber sealing element (24), wherein the sleeve (7) is fixed in the outer cylinder (6), the upper rubber sealing element (23) is embedded on the inner wall of the sleeve (7), the lower rubber sealing element (24) is sleeved on the movable base (16), and the sleeve (7), the sealing cover plate (8) and the movable base (16) form a cement curing cavity (31);
the cementation strength testing device is composed of a sleeve (7), a sealing cover plate (8), a top column (9), an upper nut (10), an upper gasket (11), a movable base (16), a lower nut (17), a lower gasket (18), an upper rubber sealing part (23), a lower rubber sealing part (24), a heating and heat-insulating device (27), a temperature sensor (28), a pressure sensor (29) and an acquisition control system (30), wherein the heating and heat-insulating device (27) is enveloped on the outer wall of a sealing kettle body (2), and data generated by the temperature sensor (28) and the pressure sensor (29) are acquired and integrated by the acquisition control system (30).
2. The device for simulating the cementing strength of the set cement under the high-temperature and high-pressure downhole working condition according to claim 1, is characterized in that: rubber seal gasket (5), last packing (14), lower packing (21), upper rubber seal spare (23), lower floor rubber seal spare (24) be polytetrafluoroethylene material, fixing bolt packing ring (4), upper washer (11), lower packing ring (18) are hastelloy material, go up packing (14) and lower packing (21) are trapezoidal packing, set up in the packing and store chamber (13) and store chamber (20) down on having emollient.
3. The device for simulating the cementing strength of the set cement under the high-temperature and high-pressure downhole working condition according to claim 1, is characterized in that: the diameter D1 of the sealing cover plate (8) is 0.7mm-1mm smaller than the inner diameter D of the sleeve (7), the diameter D2 of the movable base (16) is 0.7mm-1mm smaller than the inner diameter D of the sleeve (7), and the outer diameter D3 of the sleeve (7) is 1mm-1.5mm smaller than the inner diameter D4 of the outer cylinder (6).
4. The device for simulating the cementing strength of the set cement under the high-temperature and high-pressure downhole working condition according to claim 1, is characterized in that: after the device is assembled, the distance between the sealing cover plate (8) and the top column (9) is not more than 20mm, the distance between the movable base (16) and the bottom of the sealing kettle body (2) is kept between 8mm and 10mm, the top column (9) can move downwards by means of an external device, the downward movement speed is 2mm/min, and the maximum stroke is 30 mm.
5. The device for simulating the cementing strength of the set cement under the high-temperature and high-pressure downhole working condition according to claim 1, is characterized in that: the data acquisition period of the acquisition control system (30) is 5 s.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470596A (en) * | 2019-09-12 | 2019-11-19 | 西南石油大学 | Behavior of Hardened Cement Paste cementing strength in-situ testing device and method under a kind of operating condition of simulation high temperature and pressure underground |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110470596A (en) * | 2019-09-12 | 2019-11-19 | 西南石油大学 | Behavior of Hardened Cement Paste cementing strength in-situ testing device and method under a kind of operating condition of simulation high temperature and pressure underground |
| CN110470596B (en) * | 2019-09-12 | 2024-03-19 | 西南石油大学 | In-situ test device and method for simulating cement stone cementing strength under high-temperature high-pressure underground working condition |
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