CN107542457B - Experimental device and method for simulating influence of geological structure on stratum pressure in drainage process - Google Patents
Experimental device and method for simulating influence of geological structure on stratum pressure in drainage process Download PDFInfo
- Publication number
- CN107542457B CN107542457B CN201710859670.2A CN201710859670A CN107542457B CN 107542457 B CN107542457 B CN 107542457B CN 201710859670 A CN201710859670 A CN 201710859670A CN 107542457 B CN107542457 B CN 107542457B
- Authority
- CN
- China
- Prior art keywords
- pressure
- cylinder body
- experimental
- drainage
- pressing plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to an experimental device and a method for simulating the influence of a geological structure on the formation pressure in a drainage process, wherein the experimental device comprises a first experimental cylinder body and a second experimental cylinder body, a first sealing pressing plate is arranged in the first experimental cylinder body, a first sand filling area is formed between the first sealing pressing plate and the bottom of the first experimental cylinder body, a second sealing pressing plate is arranged in the second experimental cylinder body, a second sand filling area is formed between the second sealing pressing plate and the bottom of the second experimental cylinder body, the first sand filling area and the second sand filling area can be communicated in one way through a connecting pipeline, a drainage pipeline is arranged at the bottom of the first experimental cylinder body, and a flowmeter is arranged on the drainage pipeline; the first sand-filled zone forms a near wellbore zone simulation zone and the second sand-filled zone forms a far wellbore zone simulation zone. The experimental device and the method realize real-time measurement of the zone pressure of the near well and the far well, effectively guide site construction by simulating and exploring the influence of the geological structure on the formation pressure change rule in the drainage process, and ensure smooth and effective execution of pressure control drainage.
Description
Technical Field
The invention relates to the technical field of petroleum testing, in particular to an experimental device and method for simulating the influence of a geological structure on the formation pressure in a drainage process.
Background
The pressure control drilling technology is an important technology for solving the complex drilling problems of easy leakage, blowout, sticking and the like of a stratum with a narrow safety density window at present. Often meet huge thick salt paste layer in the oil drilling process, huge thick salt paste layer engineering geological characteristics are complicated, the super high pressure brine between layers generally develops, vertically and horizontally distributes irregularly, the pressure gradient changes greatly, and pre-drilling prediction is difficult. The brine layer has a narrow safety drilling density window, and the complex conditions of spraying, leaking, clamping and the like are frequent by adopting the conventional drilling technology. Once the underground accident occurs, a large amount of drilling fluid is lost, so that the drilling operation period is prolonged, and the drilling operation cost is greatly increased. In order to ensure safe drilling of the ultra-deep and ultra-high pressure saline water layer, a pressure control water drainage technology is needed for the high pressure saline water layer. The conditions of the pressure control drainage technology are as follows: (1) the volume of high-pressure brine trapped between salts is limited; (2) drilling to a low-pressure layer to release brine, and reducing the pressure coefficient; (3) one well is drained, and adjacent wells benefit. By implementing the pressure control drainage technology on the high-pressure brine layer, the stratum pressure of the high-pressure brine layer is reduced to the normal pressure level, and then normal drilling fluid is used for carrying out safe drilling of the high-pressure brine layer, so that severe accidents such as overflow, lost circulation, even sticking, sidetracking and the like caused by ultrahigh pressure in the drilling process are solved, the drilling time of the brine layer is saved, and the drilling cost is reduced.
However, the following phenomenon is found in the field in the process of implementing the pressure-controlled water discharge: in the initial stage of water discharge, the stratum pressure gradually decreases along with the increase of accumulated water discharge; after draining for a period of time, the accumulated drainage amount is not reduced any more along with the increase of the accumulated drainage amount; as drainage proceeds further, formation pressure begins to drop again. In the ultra-deep ultra-high pressure water discharge process (ultra-deep: depth >6000m; ultra-high pressure: pressure >100 Mpa), the situation that the stratum pressure is stable and unchanged in stages along with the accumulated water discharge occurs, so that a stratum water discharge experiment is needed to be conducted for determining whether the stratum pressure change is caused by the near well high pressure and the far well low pressure caused by a geological structure, the change rule of the stratum pressure along with the accumulated water discharge is explored, the on-site pressure control water discharge operation is further guided, and a certain guiding significance is provided for safe drilling of an ultra-deep ultra-high pressure saline water layer.
Because the pressure-controlled water drainage technology is a matched technology for dealing with the safe drilling of ultra-deep and ultra-high pressure brine layers, which is newly proposed in recent years, the related technical equipment is very rare, and the experimental device or method for simulating and exploring the influence of a geological structure on the formation pressure change rule in the drainage process is very little. The current device or method related to the formation pressure is mainly focused on theoretical calculation of the formation pressure and fluid pressure measurement, and is mainly used for predicting the formation pressure according to geological data and logging interpretation; devices or methods associated with pressure-controlled drainage have focused primarily on wellhead devices that relieve pressure from blow-out, and are primarily some of the devices associated with well control. In summary, at present, no experimental device capable of well simulating and exploring influences of geological structures on formation pressure change rules in a drainage process exists, and on-site pressure control drainage operation cannot be guided.
Therefore, the inventor provides an experimental device and a method for simulating the influence of a geological structure on the formation pressure in the drainage process by virtue of experience and practice in related industries for many years, so that the guidance on the on-site pressure control drainage operation is realized, and the method has guiding significance on the safe drilling of an ultra-deep and ultra-high pressure saline layer.
Disclosure of Invention
The invention aims to provide an experimental device and method for simulating the influence of a geological structure on the formation pressure in the drainage process, so that the real-time measurement of the zone pressure of a near well and a far well is realized, the influence of the geological structure on the formation pressure change rule in the drainage process is researched through simulation, the site construction is effectively guided, and the smooth and effective running of the pressure-controlled drainage is ensured.
The invention aims to realize the experimental device for simulating the influence of a geological structure on the formation pressure in the drainage process; the experimental device comprises a first experimental cylinder body and a second experimental cylinder body, wherein the top of the first experimental cylinder body can be opened and sealed, a first sealing pressing plate which can slide along the inner side wall of the first experimental cylinder body in a sealing way and can be fixed is arranged in the first experimental cylinder body, a first sand filling area which is sealed is formed between the first sealing pressing plate and the bottom of the first experimental cylinder body, a second sealing pressing plate which can slide along the inner side wall of the second experimental cylinder body in a sealing way and can be fixed is arranged in the second experimental cylinder body, a second sand filling area which is sealed is formed between the second sealing pressing plate and the bottom of the second experimental cylinder body, the first sand filling area and the bottom of the second sand filling area can be communicated through a connecting pipeline which allows liquid to flow from the second sand filling area to the first sand filling area, and one end, close to the second experimental cylinder body, of the connecting pipeline is provided with a connecting line pressure gauge; the space above the first sealing pressing plate in the first experimental cylinder body can be communicated with a first pressure pump through a first pressurizing pipeline, a first pressurizing pressure gauge is arranged at the outlet of the first pressure pump, a first saturated water pipeline is communicably arranged on the side wall of the first sand filling area of the first experimental cylinder body, and the inlet of the first saturated water pipeline can be communicated with the first pressure pump; a drainage pipeline is arranged on one side, far away from the second experimental cylinder, of the bottom of the first experimental cylinder in a communicating manner, a drainage pressure gauge is arranged at the inlet of the drainage pipeline, and a flowmeter is arranged at the outlet of the drainage pipeline; the space above the second sealing pressing plate in the second experimental cylinder body can be communicated with a second pressure pump through a second pressurizing pipeline, a second pressurizing pressure gauge is arranged at the outlet of the second pressure pump, a second saturated water pipeline is communicably arranged on the side wall of the second sand filling area of the second experimental cylinder body, and the inlet of the second saturated water pipeline can be communicated with the second pressure pump; the first sand-filling area of the first experimental cylinder body forms a near well zone simulation area, and the second sand-filling area of the second experimental cylinder body forms a far well zone simulation area.
In a preferred embodiment of the present invention, a first valve is disposed at the outlet of the first pressure pump, a second valve is disposed at the outlet of the first pressurizing pipeline, a third valve is disposed at the outlet of the first saturated water pipeline, and a fourth valve is disposed on the drain pipeline between the drain pressure gauge and the flow meter; the outlet of the second pressure pump is provided with a fifth valve, the outlet of the second pressurizing pipeline is provided with a sixth valve, and the outlet of the second saturated water pipeline is provided with a seventh valve.
In a preferred embodiment of the present invention, the inlet of the first saturated water line is communicably disposed on the first pressurization line between the first pressurization pressure gauge and the second valve; the inlet of the second saturated water line is communicably disposed on the second pressurized line between the second pressurized pressure gauge and the sixth valve.
In a preferred embodiment of the present invention, the connecting line is provided with a one-way valve allowing liquid to flow from the second sand filling area to the first sand filling area, and the one-way valve is located between the first sand filling area and the connecting line pressure gauge.
In a preferred embodiment of the present invention, a first fixing block which can be detachably supported and limited by the first sealing pressing plate from top to bottom is arranged on the inner side wall of the first experiment cylinder and above the first sealing pressing plate; the second fixing block which can be detachably arranged on the inner side wall of the second experiment cylinder body and is positioned above the second sealing pressing plate and can be propped against and limited by the second sealing pressing plate from top to bottom is arranged.
In a preferred embodiment of the present invention, the first fixing block may be fixed to an inner sidewall of the first experimental cylinder by a bolt, and the second fixing block may be fixed to an inner sidewall of the second experimental cylinder by a bolt.
In a preferred embodiment of the present invention, the first experimental cylinder is a rectangular groove, a detachable and sealed first top plate is disposed at the top of the first experimental cylinder, a first pressurizing space is formed between the first top plate and the first sealing pressure plate in the first experimental cylinder, and the first pressurizing pipeline and the first pressurizing space are communicably disposed; the second experiment cylinder body is a rectangular groove body, a second top plate which can be detached and is fixed in a sealing mode is arranged at the top of the second experiment cylinder body, a second pressurizing space is formed between the second top plate and the second sealing pressing plate and is arranged in the second experiment cylinder body, and the second pressurizing pipeline and the second pressurizing space can be communicated.
In a preferred embodiment of the present invention, one end of the connecting line, the first pressurizing line, the first saturated water line and the drain line are connected to the first experimental cylinder by screw thread sealing; the other end of the connecting pipeline, the second pressurizing pipeline and the second saturated water pipeline are connected to the second experimental cylinder body in a threaded sealing mode.
The object of the invention is also achieved by a method of using an experimental set-up for simulating the effect of a geological formation on the formation pressure during drainage, comprising the steps of,
step a, completing pipeline assembly of an experimental device, arranging a first sealing pressing plate outside a first experimental cylinder body, arranging a second sealing pressing plate outside a second experimental cylinder body, determining that each valve is in a closed state, and determining the tightness of each pipeline;
step b, tightly attaching gauze to the inner side walls of the first experimental cylinder body and the second experimental cylinder body, filling sand into the first experimental cylinder body and the second experimental cylinder body to a set height, placing a first sealing pressing plate into the first experimental cylinder body and pressing the first sealing pressing plate above the sand, installing a first fixing block above the first sealing pressing plate, and sealing the first experimental cylinder body from the top; placing a second sealing pressing plate into the second experimental cylinder body and pressing the second sealing pressing plate above the sand, installing a second fixing block above the second sealing pressing plate, and sealing the second experimental cylinder body from the top;
c, opening a first valve, a third valve, a fifth valve and a seventh valve, starting a first pressure pump and a second pressure pump, pressing saline into a first experimental cylinder body through a first saturated water pipeline by using the first pressure pump, pressing saline into a second experimental cylinder body through a second saturated water pipeline by using the second pressure pump, saturating the saline in a first sand filling area in the first experimental cylinder body and a second sand filling area in the second experimental cylinder body, closing the third valve and the seventh valve after the first sand filling area and the second sand filling area are saturated, and recording the indication number of each pressure meter at the moment;
d, opening a second valve and a sixth valve, pressing brine into the first experimental cylinder body above a first sealing pressing plate by using a first pressure pump through a first pressurizing pipeline, pressing the brine into the second experimental cylinder body above a second sealing pressing plate by using a second pressure pump through a second pressurizing pipeline, increasing the pressure of each pressure pump to enable each sealing pressing plate to pressurize corresponding sand filling areas respectively, and finishing compaction of each sand filling area, wherein the indication number of a drainage pressure meter is higher than the indication number of a connecting line pressure meter, and the brine in each sand filling area forms a high-pressure water layer to keep the pressure of each pressure pump unchanged;
step e, opening a fourth valve, performing small-displacement drainage at the initial moment, completing drainage depressurization of a high-pressure water layer of the first sand filling area, and recording the numerical value and accumulated drainage quantity of each pressure gauge at intervals;
f, maintaining quantitative drainage and recording the numerical value and accumulated drainage quantity of each pressure gauge until the pressure indication of the drainage pressure gauge is reduced to the pressure indication of the connecting line pressure gauge;
step g, when the pressure indication of the drainage pressure gauge is lower than that of the connecting line pressure gauge, the brine in the second sand filling area flows to the drainage pipeline through the connecting pipeline, the one-way valve and the first sand filling area, the drainage depressurization process data recording is continuously carried out, and the numerical value and the accumulated drainage amount of each pressure gauge are recorded at intervals;
step h, keeping quantitative drainage, recording the numerical value and accumulated drainage quantity of each pressure gauge, closing a fourth valve until the pressure indication of the drainage pressure gauge and the connecting line pressure gauge is not changed any more, and stopping drainage and depressurization;
and g, closing each pressure pump and each valve, discharging the brine and sand in each experimental cylinder, and cleaning each experimental cylinder and each pipeline to complete the experiment.
In a preferred embodiment of the present invention, in step d, the pressure values of the drainage pressure gauge and the connecting line pressure gauge are observed, and when the pressure values of the drainage pressure gauge and the connecting line pressure gauge reach the experimental set values and the readings are stable, the sand filling area is determined to be compacted.
In view of the above, the experimental device and the method for simulating the influence of the geological structure on the formation pressure in the drainage process provided by the invention have the following beneficial effects:
(1) In the experimental device for simulating the influence of the geological structure on the formation pressure in the drainage process, the experimental cylinder body, the pipeline, the pressure gauge and the flowmeter are reasonably arranged, the influence of the geological structure on the formation pressure change rule in the drainage process can be well simulated and explored, the operability is strong, the data acquisition is simple and comprehensive, and the device structure is simple and light;
(2) In the experimental device for simulating the influence of the geological structure on the stratum pressure in the drainage process, the fixed block is fixed on the inner wall of the experimental cylinder body by the bolts, so that the effective limitation of the sealing pressing plate is realized, and the problem that the sealing pressing plate is excessively jacked by the high pressure of the sand filling area during saturated brine is avoided;
(3) In the experimental device for simulating the influence of the geological structure on the stratum pressure in the drainage process, the device is provided with two experimental cylinders, and in the experimental process, the simulation of the high-pressure conditions of the near well zone and the low-pressure conditions of the far well zone can be realized, the simulation of the high-pressure conditions of the near well zone and the far well zone can also be realized, and the high-low pressure difference is adjustable, so that the device has the advantages of wide adaptability and strong adjustable capacity;
(4) The experimental device and the method for simulating the influence of the geological structure on the formation pressure in the drainage process can well simulate and research the influence of the geological structure on the formation pressure change rule in the drainage process, guide the smooth running of the on-site pressure control drainage operation, and have wide application prospects.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:
fig. 1: the experimental device is a schematic diagram of the experimental device for simulating the influence of the geological structure on the formation pressure in the drainage process.
Fig. 2: the sand filling state schematic diagram of the experimental device for simulating the influence of the geological structure on the formation pressure in the drainage process is provided.
Fig. 3: the experimental device for simulating the influence of the geological structure on the formation pressure in the drainage process is filled with sand and then is sealed.
Fig. 4: the sand-filled area saturated water time schematic diagram is used for simulating the influence of the geological structure on the stratum pressure in the drainage process.
Fig. 5: the pressurization space pressurization schematic diagram of the experimental device for simulating the influence of the geological structure on the formation pressure in the drainage process is provided.
Fig. 6: the invention discloses a drainage depressurization state schematic diagram of a first sand filling area in an experimental device for simulating the influence of a geological structure on the formation pressure in a drainage process.
Fig. 7: the drainage schematic diagram of the second sand filling area and the first sand filling area of the experimental device for simulating the influence of the geological structure on the formation pressure in the drainage process is provided.
Fig. 8: the invention relates to a schematic diagram after pressure control and water drainage of a second sand filling area and a first sand filling area of an experimental device for simulating the influence of a geological structure on the formation pressure in a water drainage process.
Fig. 9: the experimental data relation diagram is an experimental device for simulating the influence of the geological structure on the formation pressure in the drainage process.
In the figure:
100. the experimental device is used for simulating the influence of the geological structure on the stratum pressure in the drainage process;
1. a first experimental cylinder;
101. a first sand filling area; 102. a first pressurized space;
11. a first sealing pressure plate; 12. a first fixed block; 13. a first top plate;
2. a second experimental cylinder;
201. a second sand filling area; 202. a second pressurized space;
21. a second sealing pressure plate; 22. a second fixed block; 23. a second top plate;
3. a connecting pipeline; 31. connecting a pressure gauge;
41. a first pressurized line; 42. a second pressurized line;
51. a first pressure pump; 511. a first pressurization pressure gauge;
52. a second pressure pump; 521. a second pressurization pressure gauge;
61. a first saturated water line; 62. a second saturated water line;
7. a drain line; 71. a drainage pressure gauge;
8. a flow meter;
91. a first valve; 92. a second valve; 93. a third valve; 94. a fourth valve; 95. a fifth valve; 96. a sixth valve; 97. a seventh valve; 98. a one-way valve.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1 to 9, the present invention provides an experimental apparatus 100 for simulating the effect of a geological structure on formation pressure during drainage; the device comprises a first experiment cylinder body 1 and a second experiment cylinder body 2, wherein the top of the first experiment cylinder body 1 can be opened and can be sealed, a first sealing pressing plate 11 which can be sealed, abutted and slid along the inner side wall of the first experiment cylinder body 1 and can be fixed is arranged in the first experiment cylinder body 1, a first sand filling area 101 which is sealed is formed between the first sealing pressing plate 11 and the bottom of the first experiment cylinder body 1, a second sealing pressing plate 21 which can be sealed, abutted and slid along the inner side wall of the second experiment cylinder body 2 and can be fixed is arranged in the second experiment cylinder body 2, a second sand filling area 201 which is sealed is formed between the second sealing pressing plate 21 and the bottom of the second experiment cylinder body 2 is arranged in the second experiment cylinder body 2, the bottoms of the first sand filling area 101 and the second sand filling area 201 can be communicated through a connecting pipeline 3 which allows liquid to flow from the second sand filling area 201 to the first sand filling area 101, and one end of the connecting pipeline 3, which is close to the second experiment cylinder body 2, is provided with a connecting line pressure gauge 31; the space above the first sealing pressing plate 11 in the first experimental cylinder 1 can be communicated with the first pressure pump 51 through the first pressurizing pipeline 41, a first pressurizing pressure gauge 511 is arranged at the outlet of the first pressure pump 51, a first saturated water pipeline 61 is communicably arranged on the side wall of the first sand filling area 101 of the first experimental cylinder 1, and the inlet of the first saturated water pipeline 61 can be communicated with the first pressure pump 51; a drain pipeline 7 is arranged on one side, far away from the second experimental cylinder 2, of the bottom of the first experimental cylinder 1 in a communicating manner, a drain pressure gauge 71 is arranged at the inlet of the drain pipeline 7, and a flowmeter 8 is arranged at the outlet of the drain pipeline 7; the space above the second sealing pressing plate 21 in the second experimental cylinder 2 can be communicated with the second pressure pump 52 through the second pressurizing pipeline 42, a second pressurizing pressure gauge 521 is arranged at the outlet of the second pressure pump 52, a second saturated water pipeline 62 is communicably arranged on the side wall of the second sand filling area 201 of the second experimental cylinder 2, and the inlet of the second saturated water pipeline 62 can be communicated with the second pressure pump 52; the first sand filling area 101 of the first experimental cylinder 1 forms a near-wellbore-zone simulation area, the first sand filling area 101 is filled with sand and compacted to the formation pressure to form a near-wellbore-zone simulation stratum, the second sand filling area 201 of the second experimental cylinder 2 forms a far-wellbore-zone simulation area, and the second sand filling area 201 is filled with sand and compacted to the formation pressure to form a far-wellbore-zone simulation stratum.
In the experimental device for simulating the influence of the geological structure on the formation pressure in the drainage process, the experimental cylinder body, the pipeline, the pressure gauge and the flowmeter are reasonably arranged, the influence of the geological structure on the formation pressure change rule in the drainage process can be well simulated and explored, the operability is strong, the data acquisition is simple and comprehensive, and the device structure is simple and light; the sealing pressing plate can be fixed on the inner side wall of the experimental cylinder body, so that the problem that the sealing pressing plate is excessively jacked up by high pressure of a sand filling area during saturated brine is avoided; in the experimental device for simulating the influence of the geological structure on the stratum pressure in the drainage process, the device is provided with two experimental cylinders, and in the experimental process, the simulation of the high-pressure conditions of the near well zone and the low-pressure conditions of the far well zone can be realized, the simulation of the high-pressure conditions of the near well zone and the far well zone can also be realized, and the high-low pressure difference is adjustable, so that the device has the advantages of wide adaptability and strong adjustable capacity; the experimental device for simulating the influence of the geological structure on the formation pressure in the drainage process can well simulate and research the influence of the geological structure on the formation pressure change rule in the drainage process, guide the smooth operation of on-site pressure control drainage, and has wide application prospect.
Further, as shown in fig. 1, a first valve 91 is disposed at the outlet of the first pressure pump 51, a second valve 92 is disposed at the outlet of the first pressurizing line 41, a third valve 93 is disposed at the outlet of the first saturated water line 61, and a fourth valve 94 is disposed between the drain pressure gauge 71 and the flow meter 8 on the drain line 7; a fifth valve 95 is provided at the outlet of the second pressure pump 52, a sixth valve 96 is provided at the outlet of the second pressurized line 42, and a seventh valve 97 is provided at the outlet of the second saturated water line 62. Each valve is connected in series with each corresponding pipeline through a thread seal and is respectively used for controlling the communication of each pipeline.
Further, as shown in fig. 1, the inlet of the first saturated water line 61 is communicably provided on the first pressurization line 41 between the first pressurization pressure gauge 511 and the second valve 92; the inlet of the second saturated water line 62 is communicably disposed on the second pressurized line 42 between the second pressurized pressure gauge 521 and the sixth valve 96. In the present embodiment, the inlet of the first saturated water line 61 is fixedly connected to the first pressurizing line 41 through a T-joint, and the inlet of the second saturated water line 62 is fixedly connected to the second pressurizing line 42 through a T-joint. The first saturated water line 61 and the first pressurizing line 41 use one first pressure pump 51 together, the second saturated water line 62 and the second pressurizing line 42 use one second pressure pump 52 together, so that the use efficiency of each pressure pump is improved, and the loop setting is simplified.
Further, as shown in fig. 1, the connecting line 3 is provided with a check valve 98 for allowing liquid to flow from the second sand filling area 201 to the first sand filling area 101, and the check valve 98 is located between the first sand filling area 101 and the connecting line pressure gauge 31. The check valve 98 is effective to prevent fluid from the first sand filling section 101 from flowing to the second sand filling section 201.
Further, as shown in fig. 1 and 2, a first fixing block 12 which can be detachably supported and limited on the first sealing pressing plate 11 from top to bottom is arranged on the inner side wall of the first experiment cylinder 1 and above the first sealing pressing plate 11; a second fixing block 22 which can be detachably propped against and limit the second sealing pressing plate 21 from top to bottom is arranged on the inner side wall of the second experiment cylinder body 2 and above the second sealing pressing plate 21. In the present embodiment, the first fixing block 12 can be fixed to the inner side wall of the first experimental cylinder 1 by bolts, and the second fixing block 22 can be fixed to the inner side wall of the second experimental cylinder 2 by bolts. The first fixing block 12 and the second fixing block 22 respectively realize effective limitation of the first sealing pressing plate 11 and the second sealing pressing plate 21, so that the problem that the first sealing pressing plate 11 and the second sealing pressing plate 21 are excessively jacked up by the high pressure of the first sand filling area 101 and the second sand filling area 201 when saturated brine is avoided.
Further, as shown in fig. 1 and 2, the first experiment cylinder 1 is a rectangular groove, a first top plate 13 which can be detached and sealed is fixed is provided at the top of the first experiment cylinder 1, a first pressurizing space 102 is formed between the first top plate 13 and the first sealing pressing plate 11 in the first experiment cylinder 1, and a first pressurizing pipeline 41 is provided in a communicable manner with the first pressurizing space 102; the second experiment cylinder body 2 is a rectangular groove body, a second top plate 23 which can be detached and can be fixed in a sealing way is arranged at the top of the second experiment cylinder body 2, a second pressurizing space 202 is formed between the second top plate 23 and the second sealing pressing plate 21 in the second experiment cylinder body 2, and the second pressurizing pipeline 42 and the second pressurizing space 202 are arranged in a communicating way. When sand is required to be filled into the first experimental cylinder body 1, the first top plate 13 and the first sealing pressing plate 11 are disassembled, after sand filling is finished, the first sealing pressing plate 11 is installed and fixed, and then the first top plate 13 is sealed and fixed; when sand is filled into the second experimental cylinder 2, the second top plate 23 and the second sealing pressing plate 21 are detached, after sand filling is finished, the second sealing pressing plate 21 is installed and fixed, and then the second top plate 23 is sealed and fixed.
Further, one end of the connecting line 3, the first pressurizing line 41, the first saturated water line 61, and the drain line 7 are connected to the first experimental cylinder 1 by screw sealing; the other end of the connecting line 3, the second pressurizing line 42 and the second saturated water line 62 are connected to the second experimental cylinder 2 by screw thread sealing. Each pressure gauge is connected to a corresponding pipeline in a threaded sealing manner.
The experimental device 100 for simulating the influence of the geological structure on the formation pressure in the drainage process is used for carrying out experiments to simulate and explore the influence of the geological structure on the formation pressure change rule in the drainage process, and verify whether the formation pressure is stable and unchanged in stages along with the accumulated drainage amount or not because after the pressure of a high-pressure area in a near well zone is reduced, a water source in a far low-pressure zone is supplemented to the near well zone, so that the formation pressure is stable and unchanged in stages.
The experimental method using the experimental apparatus 100 for simulating the influence of a geological structure on the formation pressure in a drainage process provided by the present invention, comprises the following steps,
step a, as shown in fig. 2, completing the assembly of the pipelines of the experimental device 100, placing a first sealing pressing plate 11 outside a first experimental cylinder 1, placing a second sealing pressing plate 21 outside a second experimental cylinder 2, determining that each valve is in a closed state, and determining the tightness of each pipeline;
step b, as shown in fig. 2 and 3, a gauze is tightly attached to the inner side walls of the first experimental cylinder 1 and the second experimental cylinder 2, sand is filled into the first experimental cylinder 1 and the second experimental cylinder 2 to a set height to form a first sand filling area 101 and a second sand filling area 201, a first sealing pressing plate 11 is placed in the first experimental cylinder 1 and pressed above the sand, a first fixing block 12 is arranged above the first sealing pressing plate 11, and a first top plate 13 of the first experimental cylinder 1 is sealed and fixedly connected, so that the first experimental cylinder 1 is sealed from the top; placing a second sealing pressing plate 21 into the second experimental cylinder 2 and pressing the second sealing pressing plate above the sand, and installing a second fixing block 22 above the second sealing pressing plate 21, and sealing and fixedly connecting a second top plate 23 of the second experimental cylinder 2 so that the second experimental cylinder 2 is sealed from the top;
step c, as shown in fig. 4, the first valve 91, the third valve 93, the fifth valve 95 and the seventh valve 97 are opened, the first pressure pump 51 and the second pressure pump 52 are started, the first pressure pump 51 is used for pressing the brine into the first experimental cylinder 1 through the first saturated water line 61, the second pressure pump 52 is used for pressing the brine into the second experimental cylinder 2 through the second saturated water line 62, the first sand filling area 101 in the first experimental cylinder 1 and the second sand filling area 201 in the second experimental cylinder 2 are saturated with the brine, the third valve 93 and the seventh valve 97 are closed after the first sand filling area 101 and the second sand filling area 201 are saturated, and the indication of each pressure gauge at the moment is recorded;
when the pump pressures of the first and second pressure pumps 51 and 52 (the numbers of the first and second pressurization pressure gauges 511 and 521) and the numbers of the drainage pressure gauge 71 and the connection line pressure gauge 31 are stable, the first and second sand filling areas 101 and 201 are considered to be saturated.
Step d, as shown in fig. 5, the second valve 92 and the sixth valve 96 are opened, brine is pressed above the first sealing pressing plate 11 in the first experimental cylinder 1 (i.e. in the first pressurizing space 102) through the first pressurizing pipeline 41 by using the first pressure pump 51, brine is pressed above the second sealing pressing plate 21 in the second experimental cylinder 2 (i.e. in the second pressurizing space 202) through the second pressurizing pipeline 42 by using the second pressure pump 52, the pressure of each pressure pump is increased to enable each sealing pressing plate to respectively pressurize the corresponding sand filling area (simulated stratum), compaction of each sand filling area is completed, at the moment, the indication number of the drainage pressure gauge 71 is higher than the indication number of the connecting line pressure gauge, the brine in each sand filling area forms a high-pressure water layer, and the pressure of each pressure pump is kept unchanged;
in the step d, the pressure values of the drainage pressure gauge 71 and the connecting line pressure gauge 31 are observed, and when the pressure values of the drainage pressure gauge 71 and the connecting line pressure gauge 31 reach the experimental set value (in a specific embodiment, the value of the drainage pressure gauge 71 reaches 1.5MPa, the value of the connecting line pressure gauge 31 reaches 1 MPa) and the readings are stable, the sand filling area is determined to be compacted.
Step e, as shown in fig. 6, the fourth valve 94 is opened, small displacement drainage is performed at the initial moment, the drainage depressurization of the high-pressure water layer of the first sand filling area 101 is completed, and the numerical value and accumulated drainage amount of each pressure gauge are recorded once at intervals; in one embodiment of the present invention, the interval is 1min;
step f, maintaining quantitative drainage and recording the numerical value and accumulated drainage of each pressure gauge until the pressure indication of the drainage pressure gauge 71 is reduced to the pressure indication of the connecting line pressure gauge 31 (in a specific embodiment, the numerical value is 1 MPa);
step g, as shown in fig. 7, when the pressure indication of the drainage pressure gauge 71 is lower than the pressure indication of the connecting line pressure gauge 31, the brine in the second sand filling area 201 flows to the drainage line 7 through the connecting pipeline 3, the one-way valve 98 and the first sand filling area 101, and the data recording of the drainage depressurization process is continuously carried out, and the numerical value and the accumulated drainage amount of each pressure gauge are recorded once at intervals; in one embodiment of the present invention, the interval is 1min;
step h, as shown in fig. 8, keeping quantitative drainage and recording the numerical value and accumulated drainage amount of each pressure gauge until the pressure indication of the drainage pressure gauge 71 and the connecting line pressure gauge 31 is no longer changed, closing the fourth valve 94, and stopping drainage depressurization;
and g, closing each pressure pump and each valve, discharging the brine and sand in each experimental cylinder, and cleaning each experimental cylinder and each pipeline to complete the experiment.
After the experiment is finished, the recorded data are integrated, and a relation curve between the pressure values of the drainage pressure gauge 71 and the connecting line pressure gauge 31 along with the accumulated drainage amount is drawn when the drainage is depressurized. The relation curve of the pressure value P of the drainage pressure gauge 71 and the accumulated drainage V is shown in fig. 9, and when the pressure indication of the drainage pressure gauge 71 is smaller than the pressure indication of the connection line pressure gauge 31, the pressure indication of the connection line pressure gauge 31 is reduced, which means that when drainage is performed, the pressure of the near-well high-pressure zone is reduced, and when the stratum pressure of the near-well zone is reduced below the stratum pressure of the far-well low-pressure zone, the water source of the far-well zone flows to the near-well zone, so that the change trend of the stratum pressure which is stable and unchanged with the accumulated drainage stage is generated.
In view of the above, the experimental device and the method for simulating the influence of the geological structure on the formation pressure in the drainage process provided by the invention have the following beneficial effects:
(1) In the experimental device for simulating the influence of the geological structure on the formation pressure in the drainage process, the experimental cylinder body, the pipeline, the pressure gauge and the flowmeter are reasonably arranged, the influence of the geological structure on the formation pressure change rule in the drainage process can be well simulated and explored, the operability is strong, the data acquisition is simple and comprehensive, and the device structure is simple and light;
(2) In the experimental device for simulating the influence of the geological structure on the stratum pressure in the drainage process, the fixed block is fixed on the inner wall of the experimental cylinder body by the bolts, so that the effective limitation of the sealing pressing plate is realized, and the problem that the sealing pressing plate is excessively jacked by the high pressure of the sand filling area during saturated brine is avoided;
(3) In the experimental device for simulating the influence of the geological structure on the stratum pressure in the drainage process, the device is provided with two experimental cylinders, and in the experimental process, the simulation of the high-pressure conditions of the near well zone and the low-pressure conditions of the far well zone can be realized, the simulation of the high-pressure conditions of the near well zone and the far well zone can also be realized, and the high-low pressure difference is adjustable, so that the device has the advantages of wide adaptability and strong adjustable capacity;
(4) The experimental device and the method for simulating the influence of the geological structure on the formation pressure in the drainage process can well simulate and research the influence of the geological structure on the formation pressure change rule in the drainage process, guide the smooth running of the on-site pressure control drainage operation, and have wide application prospects.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.
Claims (10)
1. An experimental device for simulating the influence of a geological structure on the formation pressure in a drainage process; the experimental device is characterized by comprising a first experimental cylinder body and a second experimental cylinder body, wherein the top of the first experimental cylinder body can be opened and sealed, a first sealing pressing plate which can be sealed, propped and slid along the inner side wall of the first experimental cylinder body and can be fixed is arranged in the first experimental cylinder body, a sealed first sand filling area is formed between the first sealing pressing plate and the bottom of the first experimental cylinder body, a second sealing pressing plate which can be sealed, propped, slid and fixed along the inner side wall of the second experimental cylinder body is arranged in the second experimental cylinder body, a sealed second sand filling area is formed between the second sealing pressing plate and the bottom of the second experimental cylinder body, the first sand filling area and the bottom of the second sand filling area can be communicated through a connecting pipeline which allows liquid to flow from the second sand filling area to the first sand filling area, and one end, close to the second experimental cylinder body, of the connecting pipeline is provided with a connecting line pressure gauge; the space above the first sealing pressing plate in the first experimental cylinder body can be communicated with a first pressure pump through a first pressurizing pipeline, a first pressurizing pressure gauge is arranged at the outlet of the first pressure pump, a first saturated water pipeline is communicably arranged on the side wall of the first sand filling area of the first experimental cylinder body, and the inlet of the first saturated water pipeline can be communicated with the first pressure pump; a drainage pipeline is arranged on one side, far away from the second experimental cylinder, of the bottom of the first experimental cylinder in a communicating manner, a drainage pressure gauge is arranged at the inlet of the drainage pipeline, and a flowmeter is arranged at the outlet of the drainage pipeline; the space above the second sealing pressing plate in the second experimental cylinder body can be communicated with a second pressure pump through a second pressurizing pipeline, a second pressurizing pressure gauge is arranged at the outlet of the second pressure pump, a second saturated water pipeline is communicably arranged on the side wall of the second sand filling area of the second experimental cylinder body, and the inlet of the second saturated water pipeline can be communicated with the second pressure pump; the first sand-filling area of the first experimental cylinder body forms a near well zone simulation area, and the second sand-filling area of the second experimental cylinder body forms a far well zone simulation area.
2. The experimental device for simulating the effect of geological structures on the formation pressure of a drainage process according to claim 1, wherein a first valve is arranged at the outlet of the first pressure pump, a second valve is arranged at the outlet of the first pressurizing pipeline, a third valve is arranged at the outlet of the first saturated water pipeline, and a fourth valve is arranged on the drainage pipeline and positioned between the drainage pressure gauge and the flowmeter; the outlet of the second pressure pump is provided with a fifth valve, the outlet of the second pressurizing pipeline is provided with a sixth valve, and the outlet of the second saturated water pipeline is provided with a seventh valve.
3. An experimental setup for simulating the effect of a geological formation on the formation pressure of a drainage process as claimed in claim 2, wherein the inlet of said first saturated water line is communicably disposed on said first pressurized line between said first pressurized pressure gauge and said second valve; the inlet of the second saturated water line is communicably disposed on the second pressurized line between the second pressurized pressure gauge and the sixth valve.
4. An experimental apparatus for simulating the effect of a geological formation on the formation pressure of a drainage process according to claim 1, wherein a one-way valve is provided on said connecting line to allow fluid to flow from said second sand-filled zone to said first sand-filled zone, said one-way valve being located between said first sand-filled zone and said connecting line pressure gauge.
5. The experimental device for simulating the influence of a geological structure on the formation pressure in a drainage process according to claim 1, wherein a first fixing block which can be detachably arranged on the inner side wall of the first experimental cylinder body and is positioned above the first sealing pressing plate and can be propped against and define the first sealing pressing plate from top to bottom is arranged; the second fixing block which can be detachably arranged on the inner side wall of the second experiment cylinder body and is positioned above the second sealing pressing plate and can be propped against and limited by the second sealing pressing plate from top to bottom is arranged.
6. The apparatus of claim 5, wherein the first fixed block is bolted to the inner sidewall of the first test cylinder and the second fixed block is bolted to the inner sidewall of the second test cylinder.
7. The experimental device for simulating the influence of geological structures on the formation pressure in a drainage process, which is disclosed in claim 1, wherein the first experimental cylinder body is a rectangular groove body, a first top plate which can be detached and can be fixed in a sealing manner is arranged at the top of the first experimental cylinder body, a first pressurizing space is formed between the first top plate and the first sealing pressing plate in the first experimental cylinder body, and the first pressurizing pipeline is arranged in a communicating manner with the first pressurizing space; the second experiment cylinder body is a rectangular groove body, a second top plate which can be detached and is fixed in a sealing mode is arranged at the top of the second experiment cylinder body, a second pressurizing space is formed between the second top plate and the second sealing pressing plate and is arranged in the second experiment cylinder body, and the second pressurizing pipeline and the second pressurizing space can be communicated.
8. The apparatus of claim 1, wherein one end of the connecting line, the first pressurized line, the first saturated water line, and the drain line are connected to the first test cylinder by a screw seal; the other end of the connecting pipeline, the second pressurizing pipeline and the second saturated water pipeline are connected to the second experimental cylinder body in a threaded sealing mode.
9. A method of using an experimental set-up for simulating the effect of a geological formation on formation pressure during drainage as claimed in any one of claims 1 to 8, comprising the steps of,
step a, completing pipeline assembly of an experimental device, arranging a first sealing pressing plate outside a first experimental cylinder body, arranging a second sealing pressing plate outside a second experimental cylinder body, determining that each valve is in a closed state, and determining the tightness of each pipeline;
step b, tightly attaching gauze to the inner side walls of the first experimental cylinder body and the second experimental cylinder body, filling sand into the first experimental cylinder body and the second experimental cylinder body to a set height, placing a first sealing pressing plate into the first experimental cylinder body and pressing the first sealing pressing plate above the sand, installing a first fixing block above the first sealing pressing plate, and sealing the first experimental cylinder body from the top; placing a second sealing pressing plate into the second experimental cylinder body and pressing the second sealing pressing plate above the sand, installing a second fixing block above the second sealing pressing plate, and sealing the second experimental cylinder body from the top;
c, opening a first valve, a third valve, a fifth valve and a seventh valve, starting a first pressure pump and a second pressure pump, pressing saline into a first experimental cylinder body through a first saturated water pipeline by using the first pressure pump, pressing saline into a second experimental cylinder body through a second saturated water pipeline by using the second pressure pump, saturating the saline in a first sand filling area in the first experimental cylinder body and a second sand filling area in the second experimental cylinder body, closing the third valve and the seventh valve after the first sand filling area and the second sand filling area are saturated, and recording the indication number of each pressure meter at the moment;
d, opening a second valve and a sixth valve, pressing brine into the first experimental cylinder body above a first sealing pressing plate by using a first pressure pump through a first pressurizing pipeline, pressing the brine into the second experimental cylinder body above a second sealing pressing plate by using a second pressure pump through a second pressurizing pipeline, increasing the pressure of each pressure pump to enable each sealing pressing plate to pressurize corresponding sand filling areas respectively, and finishing compaction of each sand filling area, wherein the indication number of a drainage pressure meter is higher than the indication number of a connecting line pressure meter, and the brine in each sand filling area forms a high-pressure water layer to keep the pressure of each pressure pump unchanged;
step e, opening a fourth valve, performing small-displacement drainage at the initial moment, completing drainage depressurization of a high-pressure water layer of the first sand filling area, and recording the numerical value and accumulated drainage quantity of each pressure gauge at intervals;
f, maintaining quantitative drainage and recording the numerical value and accumulated drainage quantity of each pressure gauge until the pressure indication of the drainage pressure gauge is reduced to the pressure indication of the connecting line pressure gauge;
step g, when the pressure indication of the drainage pressure gauge is lower than that of the connecting line pressure gauge, the brine in the second sand filling area flows to the drainage pipeline through the connecting pipeline, the one-way valve and the first sand filling area, the drainage depressurization process data recording is continuously carried out, and the numerical value and the accumulated drainage amount of each pressure gauge are recorded at intervals;
step h, keeping quantitative drainage, recording the numerical value and accumulated drainage quantity of each pressure gauge, closing a fourth valve until the pressure indication of the drainage pressure gauge and the connecting line pressure gauge is not changed any more, and stopping drainage and depressurization;
and g, closing each pressure pump and each valve, discharging the brine and sand in each experimental cylinder, and cleaning each experimental cylinder and each pipeline to complete the experiment.
10. The method of claim 9, wherein in step d, the pressure values of the drainage pressure gauge and the connecting line pressure gauge are observed, and the sand filling area is determined to be compacted when the pressure values of the drainage pressure gauge and the connecting line pressure gauge reach the experimental set values and the readings are stable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710859670.2A CN107542457B (en) | 2017-09-21 | 2017-09-21 | Experimental device and method for simulating influence of geological structure on stratum pressure in drainage process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710859670.2A CN107542457B (en) | 2017-09-21 | 2017-09-21 | Experimental device and method for simulating influence of geological structure on stratum pressure in drainage process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107542457A CN107542457A (en) | 2018-01-05 |
| CN107542457B true CN107542457B (en) | 2023-05-09 |
Family
ID=60963723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710859670.2A Active CN107542457B (en) | 2017-09-21 | 2017-09-21 | Experimental device and method for simulating influence of geological structure on stratum pressure in drainage process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107542457B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113539041A (en) * | 2021-07-07 | 2021-10-22 | 中国石油大学(北京) | Oil-gas transportation and gathering simulation device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798917A (en) * | 2010-03-03 | 2010-08-11 | 中国石油集团钻井工程技术研究院 | Multifunctional dynamic pollution evaluation device of coalbed drilling fluid |
| RU2520119C1 (en) * | 2012-12-27 | 2014-06-20 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Reservoir pressure maintenance system |
| CN206420738U (en) * | 2017-01-24 | 2017-08-18 | 任予鑫 | Sandstone simulation of infiltration experimental rig and its system |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4273189A (en) * | 1978-06-12 | 1981-06-16 | Carpenter Neil L | Method and apparatus for recovering natural gas from geopressured salt water |
| US6666286B2 (en) * | 2001-12-20 | 2003-12-23 | Goei Co., Ltd. | Fluid circulating apparatus for drill |
| US7845406B2 (en) * | 2007-08-30 | 2010-12-07 | George Nitschke | Enhanced oil recovery system for use with a geopressured-geothermal conversion system |
| RU2390624C1 (en) * | 2009-04-21 | 2010-05-27 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Method of oil-field development with recovery of refinery water drain and system for implementation thereof |
| CA2665035C (en) * | 2009-04-30 | 2017-02-28 | Norman J. Mcallister | A method and apparatus for separating downhole oil and water and reinjecting separated water |
| CN202204755U (en) * | 2011-08-23 | 2012-04-25 | 中国地质大学（武汉） | Test device for investigating response property of natural gas hydrate earth layer to drilling fluid invasion |
| CN104405345B (en) * | 2014-10-20 | 2017-01-18 | 中国科学院广州能源研究所 | Permeable boundary layer natural gas hydrate exploitation simulation experiment device |
| CN105735981B (en) * | 2016-04-29 | 2017-06-09 | 中国石油大学(北京) | Fractured reservoir complex working condition analogue experiment installation |
| CN206095886U (en) * | 2016-10-11 | 2017-04-12 | 西南石油大学 | Multi -functional high temperature high pressure rock core formation water damage experiment evaluation device |
| CN207393190U (en) * | 2017-09-21 | 2018-05-22 | 中国石油大学(北京) | The experimental provision that geological structure simulation influences drainage procedure strata pressure |
-
2017
- 2017-09-21 CN CN201710859670.2A patent/CN107542457B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798917A (en) * | 2010-03-03 | 2010-08-11 | 中国石油集团钻井工程技术研究院 | Multifunctional dynamic pollution evaluation device of coalbed drilling fluid |
| RU2520119C1 (en) * | 2012-12-27 | 2014-06-20 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Reservoir pressure maintenance system |
| CN206420738U (en) * | 2017-01-24 | 2017-08-18 | 任予鑫 | Sandstone simulation of infiltration experimental rig and its system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107542457A (en) | 2018-01-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204679347U (en) | A kind of drilling fluid pressurization sealing crushing test device | |
| CN112627783B (en) | Experimental device for low-frequency pressure transformation improves gas injection recovery ratio | |
| CN109342274B (en) | Polymer fracture grouting model test device and test method under pressure-bearing dynamic water condition | |
| CN108036985B (en) | Device and method for manufacturing split grouting slurry vein and detecting permeability coefficient | |
| CN103926182B (en) | Permeability coefficient test method and test device under normal pressure | |
| CN107288632B (en) | Coal-rock reservoir drainage and production water source and pressure drop path simulation device and method | |
| CN110359898A (en) | A kind of fracture-type reservoir cracks seam plugging material selection method in advance | |
| CN107436140A (en) | The settling column test instrument and test method that vacuum preloading and piling prepressing are combined | |
| CN111058818A (en) | Pulse wave reinforced hydraulic fracturing evaluation experimental device and method | |
| CN103953332A (en) | Experimental device and experimental method for simulating dynamic leakage and leaking stoppage of drilling fluid | |
| CN107542457B (en) | Experimental device and method for simulating influence of geological structure on stratum pressure in drainage process | |
| CN108717039B (en) | Critical test simulation equipment for permeation splitting grouting | |
| CN112360430B (en) | Experimental device for crack plugging simulation evaluation | |
| CN108195739B (en) | Pressure-controlled seepage test mechanism and seepage time measuring device | |
| CN107542456B (en) | Experimental device and method for simulating influence of seepage resistance on formation pressure in drainage process | |
| CN204252993U (en) | Ball sealer machine plugging experimental facilities | |
| CN207393190U (en) | The experimental provision that geological structure simulation influences drainage procedure strata pressure | |
| CN113720994A (en) | Device and method for testing stability of shield tunnel excavation surface under spring condition | |
| CN112443288B (en) | Experimental device for evaluating sealing capacity of two interfaces of well cementation cement sheath | |
| CN210768666U (en) | Pressure control equipment for drilling of ultra-deep well | |
| CN106437681B (en) | Stress test method for oil well casing | |
| CN2866805Y (en) | Drilling well leakage plugging simulating experimental instrument | |
| CN115808437B (en) | Subway communication channel freezing method construction model test device and method | |
| CN207393191U (en) | The experimental provision that simulation filtrational resistance influences drainage procedure strata pressure | |
| CN110685677A (en) | Water control simulation experiment device and experiment method for horizontal well of heterogeneous oil reservoir |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |