CN110778291B - Experimental device for simulating natural gas hydrate formation well cementation - Google Patents
Experimental device for simulating natural gas hydrate formation well cementation Download PDFInfo
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- CN110778291B CN110778291B CN201911007345.9A CN201911007345A CN110778291B CN 110778291 B CN110778291 B CN 110778291B CN 201911007345 A CN201911007345 A CN 201911007345A CN 110778291 B CN110778291 B CN 110778291B
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 230000015572 biosynthetic process Effects 0.000 title claims description 17
- 239000004568 cement Substances 0.000 claims abstract description 72
- 239000002002 slurry Substances 0.000 claims abstract description 70
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 31
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/04—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of buildings
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
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- Business, Economics & Management (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses an experimental device for simulating natural gas hydrate stratum well cementation, which relates to the technical field of unconventional oil and gas reservoir development and comprises the following components: the reaction kettle comprises a kettle body and a reaction kettle cover, wherein the kettle body comprises a kettle barrel and a kettle cover, a first space for filling a stratum skeleton simulant and a second space for injecting cement slurry are arranged in the kettle barrel, and the second space is positioned between the first space and the kettle cover; the gas-liquid pressurization injection system is communicated with the first space through a first pipeline and is used for injecting natural gas and water into the first space; the cement slurry injection system is communicated with the second space through a second pipeline and is used for injecting cement slurry into the second space; the temperature control system is used for controlling the temperature of the kettle barrel and the kettle cover; and the data processing system is used for acquiring temperature or pressure data in the first space and the second space and processing and analyzing the data. The invention realizes the in-situ test of the conduction rule of the hydration heat of the well cementation cement slurry in the well cementation process in the stratum containing hydrate near the well wall and the influence of the conduction rule on the stratum temperature and the hydrate stability and the like.
Description
Technical Field
The invention relates to the technical field of unconventional oil and gas reservoir development, in particular to an experimental device for simulating natural gas hydrate formation cementing.
Background
Natural gas hydrate is taken as a clean new energy with huge resource potential, is widely distributed in porous media of land permafrost zones and sea bed stratums at the edges of continents, and is favored by more and more countries in the world. However, since the natural gas hydrate only exists stably under high pressure and low temperature conditions, any temperature or pressure change during the drilling process of the hydrate-containing formation can cause the hydrate to be decomposed, cause the instability of the well wall and cause serious drilling accidents and economic losses. In order to complete exploration, evaluation and exploitation of the natural gas hydrate, well cementation is an indispensable key technical means.
Although the well cementation measures have important guarantee effect on maintaining the stability of the hydrate-containing stratum and the casing near the well wall, the hydration heat release of a large amount of well cementation cement slurry is a hidden trouble which is not ignored when the hydrate stability is influenced. When a large amount of well cementation cement slurry is hydrated and consolidated, a large part of released heat is directly transmitted into a stratum close to a well wall, the temperature condition that hydrate in the stratum stably exists is changed, and the hydrate is decomposed, so that serious drilling accidents such as well wall collapse, blowout and the like are caused. In addition, once water and gas generated by hydrate decomposition enter the well cementation cement slurry under the driving of pressure, the water cement ratio of the cement slurry and the porosity of a consolidation body can be changed, and the consolidation quality of the cement slurry is further influenced. If the cement slurry consolidation strength develops slowly, and a large amount of hydrate is decomposed and generates large lateral pressure on a cement sheath, not only gas channeling is easily generated to influence the quality of upper well cementation, but also gas expansion collapse of a consolidation body and instability of a well wall can be caused, and even a casing is crushed. Therefore, it is necessary to deeply research the conduction rule of the hydration heat of the well cementation cement slurry in the hydrate-containing stratum near the well wall, the influence of the hydration heat of the well cementation cement slurry on the stratum temperature and the hydrate stability, and the influence of the hydrate decomposition on the well cementation quality, so as to determine the reasonable control range of the hydration heat value of the well cementation cement slurry and the consolidation performance requirement of the cement slurry, so as to reasonably design a low-heat cement slurry system for cementing the hydrate-containing stratum, and further realize the safe and efficient development of hydrate resources. However, an experimental device capable of simulating an actual well cementation environment is not developed at present, and further in-situ test and data acquisition analysis cannot be carried out on the conduction rule of the hydration heat of well cementation cement slurry in a stratum containing hydrate near a well wall and the influence of the hydration heat on the stratum temperature, the hydrate stability and the like.
Disclosure of Invention
The embodiment of the invention provides an experimental device for simulating natural gas hydrate stratum well cementation, which can simulate the actual well cementation environment and realize in-situ test on the conduction rule of the hydration heat of well cementation cement slurry in a hydrate stratum near a well wall and the influence of the hydration heat on the stratum temperature and the hydrate stability in the well cementation process.
In order to achieve the above object, an experimental apparatus for simulating natural gas hydrate formation cementing provided by the embodiment of the present invention includes:
the kettle body comprises a kettle barrel and a kettle cover, wherein the kettle barrel comprises a first space for filling a stratum skeleton simulant and a second space for injecting cement slurry, and the second space is positioned between the first space and the kettle cover;
the gas-liquid pressurization injection system is communicated with the first space through a first pipeline and is used for injecting natural gas and water into the first space;
the cement slurry injection system is communicated with the second space through a second pipeline and is used for injecting cement slurry into the second space;
the temperature control system is used for controlling the temperature of the kettle barrel and the kettle cover;
and the data processing system is used for acquiring temperature or pressure data in the first space and the second space, and processing and analyzing the data.
The embodiment of the invention fills the stratum framework simulant in the first space, fills natural gas and water into the stratum framework simulant through the gas-liquid pressurizing injection system to simulate the stratum environment, simulates the casing through the kettle cover, simulates the gap between the casing and the stratum through the second space, and detects, collects and analyzes the environmental data of the stratum and the cement slurry cavity through the data processing system, thereby realizing the in-situ test of the conduction rule of the hydration heat of the well cementation cement slurry in the well wall and the influence of the hydration heat of the well cementation slurry on the stratum containing hydrate in the well wall and the stability of the stratum temperature and the hydrate. Furthermore, whether the well cementation cement slurry system to be adopted meets the well cementation requirement of the hydrate formation can be evaluated in advance through the experimental device, and quantitative evaluation technology and theoretical basis are provided for reasonable design of a hydrate-containing formation well cementation process and technology. In conclusion, the successful development of the experimental device not only can directly provide technical means for the related research of the natural gas hydrate, fill the technical blank in the field in China and enhance the independent innovation capability of China, but also is beneficial to understanding the influence of the well cementation cement slurry on the hydrate decomposition in the stratum near the well wall, the reverse action rule of the hydrate decomposition on the cement slurry consolidation process and the influence mechanism of the well cementation casing, thereby providing theoretical support for the research of the hydrate stratum well cementation process and technology.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of an experimental apparatus for simulating natural gas hydrate formation cementing provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In an exemplary embodiment, an experimental apparatus for simulating natural gas hydrate formation cementing is provided in an embodiment of the present invention, including: the system comprises a kettle body 100, a gas-liquid pressurizing injection system 200, a cement slurry injection system 400, a temperature control system and a data processing system.
The kettle body 100 comprises a kettle barrel 110 and a kettle cover 120. The kettle barrel 110 comprises a first space 130 for filling the stratum skeleton simulant and a second space 140 for injecting cement slurry, and the second space 140 is positioned between the first space 130 and the kettle cover 120. The kettle cover 120 seals the opening of the kettle barrel 110 and is used to simulate a bushing. The vessel body 100 may be cylindrical. The kettle body 100 is made of a material with good heat conduction, and can be made of stainless steel or aluminum alloy, and can also be made of a heat insulating material, and is related to the temperature control structure of the experimental device, and is not limited herein.
Specifically, as shown in fig. 1, the formation skeleton simulant is filled in the first space 130 of the still pot 110. The first space 130 is located below the second space 140, i.e., the first space 130 and the second space 140 are disposed above each other. The first space 130 communicates with the gas-liquid pressurized injection system 200 through a first pipe 300. An air inlet 111 through which the first duct 300 communicates with the first space 130 is provided at the bottom of the kettle drum 110. One or more air inlets 111 may be provided. Optionally, the plurality of gas inlets 111 are uniformly distributed at the bottom of the kettle barrel 110, which is beneficial to uniformity of injection of the gas hydrate and ensures stability of gas pressure in the first space 130. The formation skeleton simulant may be sand, selected according to the simulated formation architecture. In this embodiment, the formation skeleton simulant is quartz sand. Natural gas hydrates may fill the gaps between the quartz sand. The side wall of the kettle barrel 110 is provided with a slurry inlet 112 and an air outlet 113 which are communicated with the second space 140, and the air outlet is closer to the kettle cover 120 relative to the slurry inlet 112. The slurry inlet 112 and the exhaust port 113 are provided at opposite sides of the sidewall of the tank 110. The exhaust port 113 communicates with a third pipe 520, and the third pipe 520 is provided with a first valve 421. The port of the third conduit 520 may be in communication with an evacuation system and a back pressure system. The first valve 421 may be a back pressure valve. The third pipe 520 may further include a filter 422, and the filter 422 is disposed between the first valve 421 and the kettle 100. The vacuum pumping system is used for pumping vacuum in the kettle body 100 before injecting natural gas. The back pressure system is used for controlling the pressure in the kettle body 110 to be constant when cement slurry is injected. It should be noted that the first space 130 and the second space 140 may also be disposed on the left and right sides, i.e. closer to the actual environment of cementing.
Optionally, in order to prevent the loss of the hydration heat of the cement paste, the accuracy of the experimental result is affected. An insulating layer can be arranged on the inner wall of the kettle barrel 120 at the position of the second space 140. Specifically, the heat insulation layer may be a rubber ring.
The gas-liquid pressurized injection system 200 is communicated with the first space 130 through the first pipe 300, and natural gas and water can be injected into the first space 130. Specifically, as shown in fig. 1, the gas-liquid pressurizing injection system 200 includes a gas-liquid supplying unit 210 and a gas-liquid pressurizing unit 220 disposed on the first pipe 300 and between the kettle body 100 and the gas-liquid supplying unit 210. The gas-liquid supply unit 210 supplies natural gas and water, and the gas-liquid pressurizing unit 220 pressurizes and injects the natural gas or water into the first space 130 to simulate an actual natural gas hydrate storage environment.
Further, as shown in fig. 1, the gas-liquid supply unit 210 may include a first supply unit 211 and a second supply unit 212, the first supply unit 211 may supply natural gas, and the second supply unit 212 may supply water. The first supply unit 211 and the second supply unit 212 communicate through a first duct 300. The gas-liquid pressurizing unit 220 includes a gas-liquid pressurizing compressor 221, a pressure gauge 223, and a flow meter 222 provided on the first pipe 300. The gas-liquid booster 221 increases the natural gas to a preset pressure, the pressure gauge 223 detects the pressure value, and the flow meter 222 monitors the gas-liquid flow rate, wherein the pressure gauge 223 is disposed between the gas-liquid booster 221 and the flow meter 222.
The grout injection system 400 is communicated with the grout inlet 112 on the kettle barrel 110, and grout can be injected into the second space 140 to simulate the grouting environment of the gap between the casing and the stratum. The cement slurry injection system 400 includes a cement slurry supply unit 410. The cement slurry supply unit 410 may inject cement slurry into the second space 140 through the second pipe 510.
Specifically, as shown in fig. 1, the second pipe 510 is communicated with the slurry inlet 112 on the still pot 110. The cement slurry supply unit 410 includes a cement slurry tank 411 and a cement slurry pump 412, and the cement slurry pump 412 is in communication with the cement slurry tank 411 through a fourth pipe 450. The cement slurry pump 412 injects cement in the cement slurry tank 411 into the second space 140 through the second pipe 510. Further, a second valve 430 is disposed between the cement slurry storage tank 411 and the kettle body 100, and the second valve 430 can be closed when the second space 140 is filled with cement slurry. A third valve 440 may be disposed on the fourth pipe 450, and the third valve 440 controls the on/off of the cement slurry pump 412 and the cement slurry storage tank 411, and also prevents the cement slurry from flowing backwards into the cement slurry pump 412.
And the temperature control system is used for controlling the temperature of the kettle barrel 110 and the kettle cover 120 and respectively simulating the actual temperature of the stratum and the actual temperature of the sleeve. The temperature control system comprises a first temperature control unit 610 and a second temperature control unit 620, wherein the first temperature control unit 610 is used for controlling the temperature of the kettle barrel 110, and the second temperature control unit 620 is used for controlling the temperature of the kettle cover 120.
Specifically, as shown in fig. 1, the first temperature control unit 610 is a circulating bath sealing cover sleeved on the outer side of the kettle barrel 110, a water outlet 612 of the circulating bath sealing cover is closer to the kettle cover 120 than a water inlet 611, and the temperature in the first space 130 and the second space 140 of the kettle barrel 110 is controlled by the water bath. The second temperature control unit 620 is a heat exchange water tank, and the heat exchange water tank is arranged on one side of the kettle cover 120 far away from the kettle barrel 110. The water inlet 621 of the heat exchange water tank is closer to the kettle cover 120 than the water outlet 622 of the heat exchange water tank.
In a simulation experiment, in the well cementation process, the conduction rule of the hydration heat of cement paste and the influence on the stability of the natural gas hydrate are detected and processed by a data processing system. The data processing system comprises a data detection module 710, a data receiving processing module 720 and a computer image processing module 730 which are sequentially connected by signals, wherein the input end of the data detection module 710 is arranged in the first space 130 and the second space 140.
Specifically, as shown in fig. 1, the data detection module 710 includes a first pressure sensing unit 712 and a first temperature sensing unit 711 disposed in the first space 130, and a second temperature sensing unit 713 disposed in the second space 140. The first pressure sensing unit 712 includes a plurality of pressure sensors, the first temperature sensing unit 711 includes a plurality of temperature sensors, the pressure sensors and the temperature sensors are inserted into the first space 130 through the side wall holes 114 on the kettle drum 110, at least one pressure sensor corresponds to at least one temperature sensor in the same plane, and the connecting line of the corresponding pressure sensor and temperature sensor in the same plane is parallel to the inner side surface of the kettle cover 120. As shown in fig. 1, the first space 130 and the second space 140 are disposed up and down, and a pressure sensor and a temperature sensor are disposed at the same height of the first space 130, and the pressure sensor and the temperature sensor can detect the pressure and temperature changes of the gas hydrate in the same layer. The spacing between adjacent pressure sensors or adjacent temperature sensors is determined according to test requirements. The distance between the adjacent pressure sensors or adjacent temperature sensors may gradually increase from top to bottom in the height direction, and is not particularly limited herein. The temperature probe of the temperature sensor of the second temperature sensing unit 713 is inserted into the second space 140 through the sidewall hole 114 of the kettle drum 110 and is detachably coupled to the kettle drum 110, so that the temperature sensor can be easily replaced and removed after the simulation test.
The data receiving and processing module 720 comprises a temperature and pressure data acquisition unit 721 and a hydration heat data processing unit 722, wherein the input end of the temperature and pressure data acquisition unit 721 is in signal connection with the data detection module 710, the output end of the temperature and pressure data acquisition unit 721 is in signal connection with the hydration heat data processing unit 722 and the computer image processing module 730, and the hydration heat data processing unit 722 is in signal connection with the computer image processing module 730. The data receiving and processing module 720 collects the data collected by the data detecting module 710, hydrates the data to a thermal processing unit, studies the conduction rule of the hydration heat of the cement paste in the first space 130, and simultaneously decomposes the natural gas hydrate, and obtains a related data processing result and a data image in the computer image processing module 730 through further data processing.
Specifically, the experimental apparatus provided in this embodiment may be: the length of the kettle body 100 is 750mm, the inner diameter of the kettle body 100 is 100mm, the low-temperature stratum well cementation operation process of hydrate and the like similar to the actual situation can be simulated under the conditions of temperature of minus 30 to 50 ℃ and pressure of 0 to 35MPa, and the temperature and pressure change in the stratum, the hydration heat characteristics of cement paste and the change situation of the effective heat transfer quantity to the stratum can be recorded in real time. The data detection module 710 includes twenty-one pressure sensors and twenty-one temperature sensors disposed in the first space 130, the first space 130 being inserted through the sidewall hole 114 of the kettle drum 110, and a temperature probe disposed in the second space 140 and inserted into the second space 140 through the sidewall hole 114 of the kettle drum 110. The temperature probe is detachably connected with the kettle barrel 110.
The specific experimental procedure of this example is as follows:
and injecting a stratum skeleton simulant into the kettle body 100, wherein the stratum skeleton simulant can be quartz sand. Water is then injected through the gas-liquid pressurization system 200. After the sand and water are filled and the cover 120 is closed. And a vacuum pumping pump communicated with the port of the third pipeline 520 is used for carrying out vacuum pumping treatment on the inside of the kettle body 100, so that the purity of the injected natural gas is high, and the natural gas hydrate is easily formed. Before natural gas injection, the back pressure system communicated with the third pipeline 520 controls the pressure at an experimental pressure value through a hand pump, the first valve 421 at the pipeline of the back pressure system, namely a back pressure valve, is opened, and then natural gas is injected into the kettle body 110 through the gas-liquid injection system 200. If the pressure injected into the autoclave body 110 is higher than the pressure of the back pressure system, the excess gas in the autoclave body 110 is discharged through the back pressure system. After the natural gas is injected and the pressure in the kettle body 100 is stabilized, the temperature control system controls the temperature of the kettle barrel 110 and the kettle cover 120 according to experimental parameters. When the cement slurry injection system 400 injects cement slurry, the back pressure valve and the back pressure system can ensure the pressure in the kettle body 100 to be stable. Therefore, dynamic pressure compensation without changing the pressure condition in the kettle body 100 can be realized in the grouting process. After the cement slurry is injected, the data processing system begins to detect, acquire and process changes in the environmental parameters within the first space 130 and the second space 140. One end of the back pressure system is provided with an air outlet. After the experiment is finished, the natural gas in the kettle body 100 is discharged through the rubber hose.
In the embodiment of the invention, the stratum framework simulant is filled in the first space 130, the natural gas hydrate is filled in the stratum framework simulant through the gas-liquid pressurized injection 200 system to simulate the stratum environment, the sleeve is simulated through the kettle cover 120, the gap between the sleeve and the stratum is simulated through the second space 140, and the data processing system is used for detecting, collecting and analyzing the environment data of the stratum and the cement slurry cavity, so that the in-situ test on the conduction rule of the hydration heat of the well cementation cement slurry in the well wall containing the hydrate stratum and the influence of the hydration heat of the well cementation cement slurry on the stratum temperature and the stability of the hydrate and the like in the well cementation process is realized. Furthermore, whether the well cementation cement slurry system to be adopted meets the well cementation requirement of the hydrate formation can be evaluated in advance through the experimental device, and quantitative evaluation technology and theoretical basis are provided for reasonable design of the well cementation process and technology of the hydrate-containing formation.
In an exemplary embodiment, the embodiment of the present invention further includes a rotating bracket 800, as shown in fig. 1, the kettle body 100 is disposed on the rotating bracket 800, and the kettle barrel 110 is rotated to facilitate cleaning of cement slurry in the kettle barrel 110. Meanwhile, if the first space 130 and the second space 140 are vertically arranged, the first space 130 and the second space 140 can be horizontally arranged by rotating the bracket 800, and thus the structure is closer to an actual well cementation structure and environment.
In an exemplary embodiment, the embodiment of the present invention further includes a dust screen 900, as shown in fig. 1, the dust screen 900 is disposed inside the kettle barrel 110 and covers the air inlet 111 where the first pipeline 300 is communicated with the first space 130. The dust screen 900 can prevent the quartz sand in the first space 130 from blocking the air inlet 111.
When underground engineering construction is carried out in a frozen soil area, concrete hydration heat has a certain heat melting effect on a frozen soil layer, and accidents such as stratum collapse, poor concrete consolidation quality and the like are easily caused. Therefore, in an exemplary embodiment, the experimental apparatus for simulating natural gas hydrate formation cementing provided by the embodiment of the present invention is used in the field of engineering construction in a frozen soil area, and is used for evaluating in advance the adverse effect of used reinforced concrete or cement slurry and the like on a frozen soil layer and the effect thereof on construction quality.
In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" structure ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the structures referred to have specific orientations, are configured and operated in specific orientations, and thus, are not to be construed as limiting the present invention.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Although the embodiments of the present invention have been described above, the above description is only for the purpose of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (14)
1. An experimental device for simulating natural gas hydrate formation cementing is characterized by comprising:
the kettle body comprises a kettle barrel and a kettle cover, wherein the kettle barrel comprises a first space for filling a stratum skeleton simulant and a second space for injecting cement slurry, and the second space is positioned between the first space and the kettle cover; the first space is positioned below the second space; the kettle cover is used for simulating a sleeve;
the gas-liquid pressurization injection system is communicated with the first space through a first pipeline and is used for injecting natural gas and water into the first space;
the cement slurry injection system is communicated with the second space through a second pipeline and is used for injecting cement slurry into the second space;
the temperature control system is used for controlling the temperature of the kettle barrel and the kettle cover; the temperature control system comprises a first temperature control unit and a second temperature control unit, the first temperature control unit is used for controlling the temperature of the kettle barrel, and the second temperature control unit is used for controlling the temperature of the kettle cover;
and the data processing system is used for acquiring temperature or pressure data in the first space and the second space, and processing and analyzing the data.
2. The assay device of claim 1, wherein: still include runing rest, the cauldron body sets up on runing rest.
3. The assay device of claim 1, wherein: and the first pipeline is arranged at the bottom of the kettle barrel and communicated with the first space through an air inlet.
4. The assay device according to any one of claims 1-3, wherein: the gas-liquid pressurizing and injecting system comprises a gas-liquid supply unit and a gas-liquid pressurizing unit arranged on the first pipeline and positioned between the kettle body and the gas-liquid supply unit.
5. The assay device of claim 4, wherein: the gas-liquid pressurizing unit comprises a gas-liquid pressurizing machine, a pressure gauge and a flow meter, wherein the gas-liquid pressurizing machine, the pressure gauge and the flow meter are arranged on the first pipeline, and the pressure gauge is arranged between the gas-liquid pressurizing machine and the flow meter.
6. The assay device according to any one of claims 1-3, wherein: an exhaust port communicated with the second space is formed in the kettle barrel and communicated with a third pipeline, a back pressure valve and a filter are arranged on the third pipeline, and the filter is arranged between the back pressure valve and the kettle body; and the third pipeline is communicated with a back pressure system.
7. The assay device according to any one of claims 1-3, wherein: the cement slurry injection system comprises a cement slurry supply unit, the cement slurry supply unit comprises a cement slurry storage tank and a cement slurry pump, the cement slurry storage tank is communicated with the second space through the second pipeline, and the cement slurry pump is communicated with the cement slurry storage tank through a fourth pipeline.
8. The assay device of claim 1, wherein: the first temperature control unit is a circulating bath sealing cover sleeved on the outer side of the kettle barrel; the second temperature control unit is a heat exchange water tank which is arranged on one side of the kettle cover, which is far away from the kettle barrel.
9. The assay device according to any one of claims 1-3, wherein: the data processing system comprises a data detection module, a data receiving processing module and a computer image processing module which are sequentially in signal connection, wherein the input end of the data detection module is arranged in the first space and the second space.
10. The assay device according to claim 9, wherein: the data detection module comprises a first pressure sensing unit, a first temperature sensing unit and a second temperature sensing unit, wherein the first pressure sensing unit and the first temperature sensing unit are arranged on the kettle barrel, and the second temperature sensing unit is arranged on the kettle barrel.
11. The assay device of claim 10, wherein: first pressure sensing unit includes a plurality of pressure sensor, first temperature sensing unit includes a plurality of temperature sensor, pressure sensor and temperature sensor pass through in the lateral wall hole on the cauldron section of thick bamboo inserts first space, in the coplanar, at least one pressure sensor corresponds with at least one temperature sensor, and the line of the pressure sensor and the temperature sensor that correspond in the coplanar is on a parallel with the kettle cover medial surface.
12. The assay device according to claim 9, wherein: the data receiving and processing module comprises a temperature and pressure data acquisition unit and a hydration heat data processing unit, wherein the input end of the temperature and pressure data acquisition unit is in signal connection with the data detection module, the output end of the temperature and pressure data acquisition unit is in signal connection with the hydration heat data processing unit and the computer image processing module, and the hydration heat data processing unit is in signal connection with the computer image processing module.
13. The assay device according to claim 1 or 2, wherein: still include the dust screen, the dust screen set up in cauldron section of thick bamboo is inboard, and covers the air inlet of first pipeline and first space intercommunication.
14. The assay device according to any one of claims 1-3, wherein: and the inner wall of the kettle barrel is provided with a heat insulation layer at the second spatial position.
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| CN111596042A (en) * | 2020-05-13 | 2020-08-28 | 中国石油集团渤海钻探工程有限公司 | Real-time evaluation device and evaluation method for sedimentation stability of well cementation cement slurry |
| CN112083141B (en) * | 2020-09-08 | 2022-04-29 | 西南石油大学 | Cement paste/drilling fluid hydration heat-affected natural gas hydrate stability testing device |
| CN112114119A (en) * | 2020-10-10 | 2020-12-22 | 广州海洋地质调查局 | Device and method for simulating influence of cement hydration on hydrate reservoir stability |
| CN113484361B (en) * | 2021-07-09 | 2023-09-01 | 西南石油大学 | Hydration heat measuring device for cement slurry system for low-temperature well cementation |
| CN113818864B (en) * | 2021-10-14 | 2023-04-07 | 中国石油大学(北京) | Simulation device and method for monitoring integrity of hydrate formation cement sheath by DAS (distributed optical System) |
| CN114151041B (en) * | 2021-12-20 | 2023-05-26 | 中国石油大学(华东) | Weak-cementing hydrate reservoir simulated wellbore construction device and method |
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| CN105259337B (en) * | 2015-11-20 | 2017-03-22 | 中国地质大学（武汉） | Hydrate/ice-containing low-temperature stratum well cementation simulation experiment reaction kettle |
| CN105484729B (en) * | 2016-01-07 | 2019-01-15 | 中国地质大学（武汉） | One kind containing hydrate, ice stratum cementing concrete ring second interface cementing strength test device |
| CN106042160A (en) * | 2016-05-18 | 2016-10-26 | 中国地质大学（武汉） | Variable-temperature variable-pressure curing device for well cementing slurry test mold |
| CN206329308U (en) * | 2016-12-27 | 2017-07-14 | 西南石油大学 | One kind simulation gas hydrates drilling straight-hole well cementation experimental provision |
| CN206707694U (en) * | 2017-05-18 | 2017-12-05 | 西南石油大学 | Hydrate formation primary cement evaluation experimental provision in a kind of deep water cementing |
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