CN111300617B - High-temperature and high-pressure cement stone curing device and cement stone preparation method - Google Patents
High-temperature and high-pressure cement stone curing device and cement stone preparation method Download PDFInfo
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- CN111300617B CN111300617B CN202010101843.6A CN202010101843A CN111300617B CN 111300617 B CN111300617 B CN 111300617B CN 202010101843 A CN202010101843 A CN 202010101843A CN 111300617 B CN111300617 B CN 111300617B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/248—Supports for drying
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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Abstract
The invention discloses a high-temperature and high-pressure cement stone curing device and a cement stone preparation method. The high-temperature and high-pressure cement stone curing device comprises a high-temperature high-pressure kettle, and a cement stone curing device is arranged in the high-temperature high-pressure cement stone curing device; the top and the bottom of the kettle body are respectively communicated with a gas outlet pipeline and a gas inlet pipeline, a heating sleeve is arranged outside the kettle body, and a temperature and pressure probe is arranged in a cavity of the kettle body; the cement stone curing device comprises an upper cover plate, a bottom plate and a plurality of middle cover plates, and curing rings are arranged between every two adjacent plates, so that a closed space is formed. The high-temperature and high-pressure cement stone curing device can simulate the working conditions of a high-temperature and high-pressure oil-gas well at the temperature of 150MPa and 300 ℃, finely simulate the complex working conditions of alternating high temperature, high pressure and the like of the high-temperature and high-pressure oil-gas well to be evaluated, directly cure and maintain cement stones under the working conditions of a high-temperature and high-pressure shaft, and cure and maintain enough tensile strength test samples and compressive strength test samples by designing the number of layers of the cement stone curing device.
Description
Technical Field
The invention relates to a high-temperature and high-pressure cement stone maintenance device and a preparation method of cement stones, and belongs to the technical field of mining and rock mechanics.
Background
The well cementation quality is the key for packing an oil layer, a gas layer and a water layer in a well bore, protecting an oil-gas well casing, prolonging the service life of the oil-gas well, improving the recovery ratio and scientifically and reasonably developing oil-gas resources. At present, along with the continuous increase of the exploration and development strength of unconventional oil and gas resources, a well cementation technology faces ultra-deep, ultra-high temperature and ultra-high pressure, complex reservoir and complex geological conditions, higher requirements are provided for the comprehensive mechanical properties of well cementation set cement, the set cement with low elastic modulus, high Poisson's ratio and higher toughness is more favorable for the integrity of a shaft in the working condition environment of a high-temperature and high-pressure oil and gas shaft, shaft safety risks such as shaft gas channeling, annulus under pressure and the like are favorably avoided, and the service life of the high-temperature and high-pressure oil and gas well is favorably prolonged. Therefore, the cement paste curing, curing and preparing method is a key basis for mastering the service performance of the cement paste, developing the formula design of a cement paste system and optimizing the performance, and can be used for really and accurately curing, curing and preparing the cement paste under the working condition of a high-temperature and high-pressure oil-gas well.
At present, the preparation of the cement stone under the high-temperature and high-pressure working condition and the mechanical property evaluation thereof have extremely important values in the aspects of scientific research and engineering technology, but the working condition of the ultra-high-temperature and ultra-high-pressure oil and gas well is complex and harsh, the conventional cement stone curing and maintaining method can not be carried out under the working condition of high-temperature and high-pressure, the mechanical property test result of the cement stone curing and maintaining under the conditions that the pressure is less than or equal to 21MPa and the temperature is lower than the temperature of a shaft is generally used for replacing the conventional cement stone curing and maintaining method, a scientific and reasonable cement stone maintaining device and a preparation method close to the site are lacked, the real mechanical property of the cement stone under the actual working condition of a high-temperature and high-pressure oil and gas shaft can not be explored, the cement stone property evaluation result deviates from the engineering practice and the like, the cement stone mechanical property error is larger due to the difference of the curing and maintaining conditions, the property of a high-temperature and high-pressure cement slurry system is not enough, and the evaluation and optimization of the cement slurry system are difficult, the well cementation quality, the promotion and the development of the well cementation technology are seriously influenced, and even the integrity of the shaft of the high-temperature high-pressure oil-gas well is threatened.
At present, the existing cement stone curing device and method have the following defects: (1) the temperature and the pressure of the cement curing device cannot reach the working condition of the high-temperature high-pressure oil-gas well; (2) the set cement is cured at a certain temperature, and is placed in a certain temperature and pressure environment for curing after being demoulded, so that the complex working conditions of alternating high temperature, high pressure and the like of a high-temperature high-pressure oil-gas well cannot be simulated finely, and the curing of the set cement can be directly carried out; (3) the cement stone solidified and maintained according to the standard size of the compressive strength test sample and the tensile strength test sample is acted by force in the demoulding process, so that the mechanical property test result of the cement stone is inaccurate. Therefore, the high-temperature high-pressure cement stone maintenance device and the method can solve the problems that the conventional high-temperature high-pressure cement stone maintenance device and method can not accurately simulate complex working conditions of alternating high temperature, high pressure and the like of a high-temperature high-pressure oil-gas well, and can not cure and maintain cement stones under the actual working condition of the high-temperature high-pressure oil-gas well.
Disclosure of Invention
The invention aims to provide a high-temperature and high-pressure cement stone maintenance device which can finely simulate complex working conditions of alternating high temperature, high pressure and the like of a high-temperature and high-pressure oil-gas well and carry out curing, maintenance and preparation on cement stones under the working conditions of the high-temperature and high-pressure oil-gas well so as to test the mechanical properties of the cement stones.
The high-temperature high-pressure set cement curing device provided by the invention comprises a high-temperature high-pressure kettle; a cement stone curing device is arranged in the high-temperature high-pressure kettle;
the top and the bottom of the high-temperature high-pressure kettle are respectively communicated with a gas outlet pipeline and a gas inlet pipeline, an exhaust one-way valve is arranged on the gas outlet pipeline, and an intake one-way valve is arranged on the gas inlet pipeline;
a heating sleeve is arranged outside the kettle body of the high-temperature high-pressure kettle;
a temperature and pressure probe is arranged in a cavity of the high-temperature high-pressure kettle and is connected with a temperature and pressure monitoring system;
the cement stone curing device comprises an upper cover plate, a bottom plate and a plurality of middle cover plates, wherein curing rings are arranged between the upper cover plate and the middle cover plates, between the middle cover plates and the bottom plate, so that a closed space is formed.
In the high-temperature and high-pressure cement curing device, one end of the gas inlet pipeline is connected with a booster pump and is used for boosting the high-temperature and high-pressure kettle;
the kettle cover of the high-temperature and high-pressure kettle body is sealed with the kettle body through the matching of bolts and nuts;
and a combined sealing ring is arranged between the kettle cover and the kettle body so as to improve the sealing property of the high-temperature and high-pressure kettle.
In the high-temperature high-pressure cement curing device, the heating sleeve is externally provided with the heat-insulating layer so as to insulate the high-temperature high-pressure kettle;
the cement stone curing device is arranged on the curing device support to stably support the cement stone curing device, and the curing device support is arranged at the bottom of the kettle body.
In the high-temperature high-pressure cement curing device, the matching parts of the upper cover plate, the middle cover plate and the bottom plate with the curing ring are step surfaces, so that the combination and the fixation are facilitated.
In the high-temperature and high-pressure cement stone curing device, the fastening pins penetrate through the through holes in the edges of the upper cover plate, the middle cover plate, the bottom plate and the curing ring and are fixed through the fastening nuts.
In the high-temperature and high-pressure cement stone maintenance device, one end of the fastening pin is matched with a lifting nut, the lifting nut is matched with a lifting handle, and the cement stone maintenance device can be conveniently moved through the lifting handle.
In the high-temperature high-pressure cement curing device, the closed space is a cylinder;
the curing ring comprises a tensile curing ring and a compression curing ring, and the height of the compression curing ring is greater than that of the tensile curing ring;
the outer diameters of the upper cover plate, the tensile curing ring, the middle cover plate, the compressive curing ring and the bottom plate can be adjusted according to the inner diameter of the high-temperature high-pressure autoclave body;
the number of layers of the tensile curing ring, the middle cover plate and the compression curing ring can be adjusted according to the number of the required tensile strength and compression strength test samples.
The high-temperature and high-pressure cement stone curing device can simulate the working conditions of a high-temperature and high-pressure oil-gas well at the temperature of 150MPa and 300 ℃, finely simulate the complex working conditions of alternating high temperature, high pressure and the like of the high-temperature and high-pressure oil-gas well to be evaluated, directly cure and maintain cement stones under the working conditions of a high-temperature and high-pressure shaft, and cure and maintain enough tensile strength test samples and compressive strength test samples by designing the number of layers of the cement stone curing device.
When the high-temperature high-pressure set cement curing device is used for preparing the tensile strength and compressive strength test samples, the steps can be carried out as follows:
1) sequentially pouring cement paste into a closed space of the set cement curing device of the high-temperature and high-pressure set cement curing device, fastening the set cement curing device, placing the set cement curing device into the high-temperature high-pressure kettle, and filling water into the high-temperature high-pressure kettle;
2) installing a kettle cover of the high-temperature high-pressure kettle on the kettle body and keeping sealing, closing the exhaust one-way valve, pressurizing the high-temperature high-pressure kettle through the air inlet one-way valve, controlling the heating sleeve to heat the high-temperature high-pressure kettle until the temperature and the pressure meet the requirements, closing the air inlet one-way valve, and curing and maintaining cement paste; recording the starting time, and monitoring and recording a time-temperature curve and a time-pressure curve during curing and maintenance by adopting the temperature and pressure monitoring system so as to record cement solidification and maintenance temperature and pressure parameters and simulate actual well cementation working conditions in a high-temperature and high-pressure oil-gas well;
3) after the curing and curing are finished, closing the heating sleeve to cool the high-temperature high-pressure kettle (preferably slowly cooling, when the temperature is lower than 60 ℃), opening the exhaust one-way valve to release the pressure of the high-temperature high-pressure kettle, opening the kettle cover of the high-temperature high-pressure kettle when the pressure is zero, and taking out the set cement curing device;
4) and disassembling the cement stone maintenance device, and respectively drilling the required quantity of tensile strength test samples and compressive strength test samples in the curing ring.
In the method, firstly, the curing and maintenance temperature and pressure of cement paste are determined according to the working condition of the high-temperature high-pressure oil-gas well to be evaluated; according to the mechanical property test requirements of a cement paste system for a high-temperature and high-pressure oil-gas well to be evaluated, the quantity of required tensile strength test samples and compressive strength test samples is determined, the number of layers of the tensile curing ring, the middle cover plate and the compressive curing ring is correspondingly designed, and meanwhile, the length of the fastening pin is reasonably selected.
In the above method, the high-temperature autoclave needs to be subjected to pressure testing before the experiment.
In the method, in step 1), before the cement paste is poured, grease is coated on the surfaces of the upper cover plate, the middle cover plate, the bottom plate and the curing ring, so that the upper cover plate, the middle cover plate, the bottom plate and the curing ring are convenient to disassemble after curing and curing, then the cement paste is combined layer by layer and poured layer by layer, finally the upper cover plate is smoothly penetrated into the fastening pin, and the whole cement stone curing device is fixed by using the fastening nut to complete the filling of the cement paste.
In the method, in the step 4), if the height of the tensile curing ring is more than 25.4mm, the height-diameter ratio of 1: 2 tensile strength test specimen; if the height of the compression-resistant curing ring is more than 50.8mm, the height-diameter ratio of 2: 1 compressive strength test specimen.
Compared with the prior art, the invention has the following advantages:
(1) the temperature and the pressure of the cement stone maintenance device can meet the working condition of the current high-temperature high-pressure oil and gas well, and the limit use temperature and the limit use pressure of the cement stone maintenance device depend on the material, the wall thickness and the safety coefficient of the high-temperature high-pressure autoclave;
(2) the cement paste curing and maintaining can be directly simulated under the complex working conditions of alternating high temperature, high pressure and the like of a high-temperature high-pressure oil-gas well;
(3) after curing and maintenance, coring is carried out according to the number of samples required by the required compressive strength and tensile strength test experiments, so that the inaccurate cement mechanical property test result caused by the action of force on the cement in the demolding process is avoided;
the experimental conditions of curing and maintaining the high-temperature and high-pressure cement stones are close to the actual engineering of the oil and gas well, the mechanical properties of the cement slurry system can be accurately analyzed and evaluated, and a more stable and reliable experimental method and data support are provided for optimization, formulation design and performance optimization of the oil and gas well cementing cement slurry system.
Drawings
Fig. 1 is a schematic structural view of the high-temperature and high-pressure set cement curing device of the present invention.
Fig. 2 is a schematic structural view of the cement paste curing device in the high-temperature and high-pressure cement paste curing device of the invention.
Fig. 3 is a plan view of the set cement curing device in the high temperature and high pressure set cement curing device of the present invention.
FIG. 4 is a schematic illustration of a tensile strength test specimen drilled from a tensile cured ring.
Figure 5 is a schematic view of a compressive strength test specimen drilled from a compressive setting ring.
FIG. 6 is a test curve of compressive strength of the cement paste system after curing and curing in the high-temperature and high-pressure set cement curing device of the invention.
FIG. 7 is a test curve of tensile strength of the cement paste system after curing and curing in the high-temperature high-pressure set cement curing device of the invention.
The respective symbols in the figure are as follows:
the device comprises a kettle cover 1, a kettle body 2, a heating sleeve 3, a heat preservation layer 4, a temperature and pressure probe 5, a temperature and pressure monitoring system 6, a combined sealing ring 7, an exhaust check valve 8, an air inlet check valve 9, a booster pump 10, a cement stone curing device 11, a curing device support 12, a bolt 13, a nut 14, an upper cover plate 15, a middle cover plate 16, a bottom plate 17, a tensile curing ring 18, a compressive curing ring 19, a fastening pin 20, a fastening nut 21, a nut 22, a handle 23, a tensile strength testing sample 24 and a compressive strength testing sample 25.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
As shown in fig. 1, the high-temperature and high-pressure set cement curing device provided by the invention comprises a high-temperature and high-pressure autoclave, wherein a set cement curing device 11 is arranged in the high-temperature and high-pressure autoclave. The kettle cover 1 and the kettle body 2 of the high-temperature high-pressure kettle body are sealed through the matching of the bolts 13 and the nuts 14, and the combined sealing ring 7 is arranged between the two bodies, so that the sealing performance of the high-temperature high-pressure kettle is improved. The top and the bottom of the high-temperature high-pressure kettle are respectively communicated with a gas outlet pipeline and a gas inlet pipeline, an exhaust one-way valve 8 is arranged on the gas outlet pipeline, an air inlet one-way valve 9 is arranged on the gas inlet pipeline, and the other end of the gas inlet pipeline is connected with a booster pump 10. A heating jacket 3 is arranged outside the kettle body 2 of the high-temperature high-pressure kettle, and a heat preservation layer 4 is arranged outside the heating jacket 3. A temperature and pressure probe 5 is arranged in a cavity of the high-temperature high-pressure kettle, and the temperature and pressure probe 5 is connected with a temperature and pressure monitoring system 6, so that the temperature and pressure monitoring during the cement stone curing and curing period is realized.
As shown in fig. 2, the cement curing device 11 is shown in fig. 2, and includes an upper cover plate 15, a bottom plate 17, and 3 intermediate cover plates 16, wherein a tensile curing ring 18 is disposed between the upper cover plate 15 and the upper 2 intermediate cover plates 16, a cylindrical closed space is formed therebetween, a compressive curing ring 19 is disposed between the bottom plate 17 and the intermediate cover plates 16 and the 2 intermediate cover plates 16, a cylindrical closed space is formed therebetween, and the height of the tensile curing ring 18 is smaller than that of the compressive curing ring 19. The matching parts of the upper cover plate 15, the middle cover plate 16 and the tensile curing ring 18 are step surfaces, and the matching parts of the middle cover plate 16, the bottom plate 17 and the compressive curing ring 19 are step surfaces, so that the combination and the fixation are convenient. The fastening pin 20 passes through the through holes at the edges of the upper cover plate 15, the middle cover plate 16, the bottom plate 17, the tensile curing ring 18 and the compressive curing ring 19 and is fixed by the fastening nut 21, the end part of the fastening pin 20 is also matched with the lifting nut 22, the lifting nut 22 is matched with the lifting handle 23, the cement stone curing device can be conveniently moved by the lifting handle 23, and the top view of the cement stone curing device is shown in fig. 3. The bottom of the high-temperature high-pressure autoclave is provided with a curing device support 12 to stably support the set cement curing device.
In the high-temperature high-pressure cement curing device, the outer diameters of the upper cover plate 15, the tensile curing ring 18, the middle cover plate 16, the compressive curing ring 19 and the bottom plate 17 can be adjusted according to the inner diameter of a high-temperature autoclave body; the number of layers of the tensile curing ring 18, the intermediate cover plate 16 and the compressive curing ring 19 can be adjusted according to the number of the required tensile strength and compressive strength test samples.
The high-temperature and high-pressure cement stone curing device can simulate the working conditions of a high-temperature and high-pressure oil-gas well at the temperature of 150MPa and 300 ℃, finely simulate the complex working conditions of alternating high temperature, high pressure and the like of the high-temperature and high-pressure oil-gas well to be evaluated, directly cure and maintain cement stones under the working conditions of a high-temperature and high-pressure shaft, and cure and maintain enough tensile strength test samples and compressive strength test samples by designing the number of layers of the cement stone curing device.
When in specific use, the method comprises the following steps:
(A) and determining the curing and maintaining temperature and pressure of the cement slurry of the high-temperature high-pressure oil-gas well to be evaluated.
(B) According to the mechanical property requirement of a cement paste system used for a high-temperature high-pressure oil-gas well to be evaluated, the number of required tensile strength test samples and compressive strength test samples is determined, the number of layers of the tensile curing ring 18, the middle cover plate 16 and the compressive curing ring 19 is correspondingly designed, and meanwhile, the length of the fastening pin 20 is reasonably selected.
(C) And (3) carrying out pressure test on the high-temperature high-pressure autoclave, confirming that the sealing performance meets the requirement of the working condition temperature and pressure of the high-temperature high-pressure oil-gas well to be evaluated, and preparing cement paste to be evaluated.
(D) Grease is sequentially coated on the upper cover plate 15, the bottom plate 17, and the contact parts of the plurality of middle cover plates 16, the tensile curing rings 18 and the compression curing rings 19 with cement paste, so that the upper cover plate, the bottom plate and the compression curing rings are convenient to disassemble after curing and curing.
(E) The bottom plate 17 is horizontally placed and penetrates through the fastening pin 20, the compression-resistant curing ring 19 penetrates through the fastening pin 20, cement paste is poured into the compression-resistant curing ring 19 to the step, the middle cover plate 16 penetrates through the fastening pin 20 and keeps close contact with the step surface, each designed layer of compression-resistant curing ring 19 and each designed tensile curing ring 18 are gradually poured into the cement paste, finally, the upper cover plate 15 smoothly penetrates through the fastening pin 20, and the whole cement stone curing device 11 is fixed through the fastening nut 21 to complete filling of the cement paste.
(F) The maintenance device support 12 is placed at the bottom of the high-temperature high-pressure kettle in the middle, the lifting nut 22 and the fastening pin 20 are connected, the whole cement stone maintenance device 11 is stably placed into the high-temperature high-pressure kettle through the lifting handle 23, and the lifting nut 22 and the lifting handle 23 are detached.
(G) Filling water into the high-temperature high-pressure kettle, installing a bolt 13 and a nut 14 to enable the kettle cover 1, the combined sealing ring 7 and the kettle body 2 to form a closed system, closing the exhaust check valve 8, opening the air inlet check valve 9, controlling the booster pump 10 to boost the high-temperature high-pressure kettle, controlling the heating sleeve 3 to heat the high-temperature high-pressure kettle until the temperature and the pressure reach the temperature and the pressure determined in the step (A), closing the air inlet check valve 9, recording the starting time, and starting monitoring and recording a time-temperature curve and a time-pressure curve during curing and curing by the temperature and pressure monitoring system 6.
(H) And (3) closing the heating sleeve 3 to slowly cool the high-temperature high-pressure kettle after the curing and curing time is finished, opening the exhaust one-way valve 8 to release the pressure of the high-temperature high-pressure kettle when the temperature is lower than 60 ℃, opening the kettle cover 1 when the pressure returns to zero, installing the lifting nut 23 and the lifting handle 24, and taking out the cement stone curing device 11.
(I) And (3) dismounting the fastening nut 21 and the fastening pin 20, opening the cement stone maintenance device 11, and taking a corresponding number of tensile strength test samples and compressive strength test samples from the tensile curing ring 18 and the compressive curing ring 19 respectively by using a coring bit according to the number of the tensile strength test samples and the compressive strength test samples determined in the step (B).
Wherein the height-diameter ratio is 1: 2 tensile strength test specimen 24 coring schematic as shown in fig. 4, the aspect ratio is 2: a schematic drawing of a core of compressive strength test specimen 25 of 1 is shown in fig. 5.
Curing and maintaining a cement paste system SL 1 according to the steps, wherein the formula of the cement paste system (all the additives are conventional additives in the field) comprises 46.97% of cement, 23.49% of heat stabilizer, 0.47% of defoaming agent, 3.29% of fluid loss additive, 4.70% of gas channeling preventing agent, 0.94% of retarder and 20.15% of water, the curing temperature and the curing pressure are respectively 300 ℃ and 150MPa, the required tensile strength test samples and the required compressive strength test samples are not less than 3, 2 layers of the tensile curing ring 18 and the compressive curing ring 19 are respectively provided, 3 middle cover plates are 16 in total, the length of the fastening pin 20 is 210mm, the curing time is 4 days, after the curing time is finished, the set cement curing device 11 is taken out and disassembled, and a 50.8mm drill bit is used for processing not less than 3 coring test samples of the tensile strength in the tensile curing ring 18; at least 3 compressive strength test samples are processed on the compressive curing ring 19 by using a 25.4mm core drill.
The prepared compressive strength test samples are respectively tested by using a rock mechanical test tester, the data with larger deviation is discarded and a compressive strength-strain curve is drawn by analyzing the compressive strength test data, as shown in figure 6, it can be seen that the compressive strength of the set cement cured and maintained by using the set cement curing device under the conditions of the temperature of 300 ℃ and the pressure of 150MPa is 36.03 MPa-42.14 MPa, the strain is 2.02% -2.07%, the compressive strength performance test result is accurate, and the parallelism is good.
Similarly, the prepared tensile strength test samples are respectively tested by using a rock mechanical test tester, the data with larger deviation is omitted and a tensile strength-strain curve is drawn by analyzing the tensile strength test result, as shown in fig. 7, the tensile strength of the set cement prepared by curing and maintaining the set cement curing device at the temperature of 300 ℃ and the pressure of 150MPa is 0.46-0.54 MPa, the strain is 0.98-1.11%, the tensile strength performance test result is accurate, and the parallelism is good.
Claims (3)
1. A high-temperature high-pressure cement stone curing device comprises a high-temperature high-pressure kettle; a cement stone curing device is arranged in the high-temperature high-pressure kettle;
the top and the bottom of the high-temperature high-pressure kettle are respectively communicated with a gas outlet pipeline and a gas inlet pipeline, an exhaust one-way valve is arranged on the gas outlet pipeline, and an intake one-way valve is arranged on the gas inlet pipeline;
one end of the gas inlet pipeline is connected with a booster pump;
a heating sleeve is arranged outside the kettle body of the high-temperature high-pressure kettle, and a heat insulation layer is arranged outside the heating sleeve;
the kettle cover of the high-temperature and high-pressure kettle body is sealed with the kettle body through the matching of bolts and nuts;
a combined sealing ring is arranged between the kettle cover and the kettle body;
a temperature and pressure probe is arranged in a cavity of the high-temperature high-pressure kettle and is connected with a temperature and pressure monitoring system;
the cement stone curing device comprises an upper cover plate, a bottom plate and a plurality of middle cover plates, wherein curing rings are arranged between the upper cover plate and the middle cover plate, between the middle cover plates and the bottom plate, so that a plurality of closed spaces are formed;
the matching parts of the upper cover plate, the middle cover plate and the bottom plate with the curing ring are step surfaces;
fastening pins penetrate through holes in the edges of the upper cover plate, the middle cover plate, the bottom plate and the curing ring and are fixed through fastening nuts;
a lifting nut is also matched with one end of the fastening pin, and the lifting nut is matched with the lifting handle;
the closed space is cylindrical;
the curing ring comprises a tensile curing ring and a compression curing ring, and the height of the compression curing ring is greater than that of the tensile curing ring;
the cement stone curing device is arranged on the curing device support, and the curing device support is arranged at the bottom of the kettle body.
2. A method for solidifying and maintaining cement stones at high temperature and high pressure comprises the following steps:
1) sequentially pouring cement paste into the closed space of the set cement curing device in the high-temperature and high-pressure set cement curing device according to claim 1, fastening the set cement curing device, placing the set cement curing device in the high-temperature and high-pressure autoclave, and filling water into the high-temperature and high-pressure autoclave;
before the cement paste is poured, smearing grease on the surfaces of the upper cover plate, the middle cover plate, the bottom plate and the curing ring, then combining layer by layer, and pouring the cement paste layer by layer;
2) installing a kettle cover of the high-temperature high-pressure kettle on the kettle body and keeping sealing, closing the exhaust one-way valve, pressurizing the high-temperature high-pressure kettle through the air inlet one-way valve, controlling the heating sleeve to heat the high-temperature high-pressure kettle until the temperature and the pressure meet the requirements, closing the air inlet one-way valve, and curing and maintaining cement paste; recording the starting time, and monitoring and recording a time-temperature curve and a time-pressure curve during curing and maintenance by adopting the temperature and pressure monitoring system;
3) after the curing and the curing are finished, closing the heating sleeve to cool the high-temperature high-pressure kettle, opening the exhaust one-way valve to release the pressure of the high-temperature high-pressure kettle, opening the kettle cover of the high-temperature high-pressure kettle when the pressure is zero, and taking out the cement stone curing device;
4) and disassembling the cement stone maintenance device, and respectively drilling the required quantity of tensile strength test samples and compressive strength test samples in the curing ring.
3. The use of the apparatus of claim 1 for curing and maintaining cement stones under high temperature and high pressure conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010101843.6A CN111300617B (en) | 2020-02-19 | 2020-02-19 | High-temperature and high-pressure cement stone curing device and cement stone preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010101843.6A CN111300617B (en) | 2020-02-19 | 2020-02-19 | High-temperature and high-pressure cement stone curing device and cement stone preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111300617A CN111300617A (en) | 2020-06-19 |
| CN111300617B true CN111300617B (en) | 2022-03-04 |
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| CN102830057A (en) * | 2012-09-10 | 2012-12-19 | 西南石油大学 | Evaluating method for corrosion of well-reinforcing cement stone |
| CN103558363A (en) * | 2013-11-04 | 2014-02-05 | 西南石油大学 | Method for evaluating self-repairing performance of well cementation cement sheath |
| CN104070596A (en) * | 2014-06-24 | 2014-10-01 | 中国海洋石油总公司 | Ultra high temperature oil well set cement curing kettle and use method thereof |
| CN205853062U (en) * | 2016-08-03 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of high temperature and pressure protective cauldron hardened oilwell cement maintenance mould |
| 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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| JP4105929B2 (en) * | 2002-10-30 | 2008-06-25 | 株式会社アーステクニカ | Autoclave curing equipment |
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| CN102830057A (en) * | 2012-09-10 | 2012-12-19 | 西南石油大学 | Evaluating method for corrosion of well-reinforcing cement stone |
| CN103558363A (en) * | 2013-11-04 | 2014-02-05 | 西南石油大学 | Method for evaluating self-repairing performance of well cementation cement sheath |
| CN104070596A (en) * | 2014-06-24 | 2014-10-01 | 中国海洋石油总公司 | Ultra high temperature oil well set cement curing kettle and use method thereof |
| CN205853062U (en) * | 2016-08-03 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of high temperature and pressure protective cauldron hardened oilwell cement maintenance mould |
| 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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