CN217897798U

CN217897798U - Coring simulation experiment device

Info

Publication number: CN217897798U
Application number: CN202221197958.0U
Authority: CN
Inventors: 裴学良; 陈锐; 刘晗; 任红; 陈勇; 张辉; 张锐; 赵宗锋
Original assignee: Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp; Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
Current assignee: China Petroleum and Chemical Corp; Sinopec Oilfield Service Corp; Sinopec Shengli Petroleum Engineering Corp; Drilling Technology Research Institute of Sinopec Shengli Petroleum Engineering Corp
Priority date: 2022-05-17
Filing date: 2022-05-17
Publication date: 2022-11-25
Anticipated expiration: 2032-05-17

Abstract

The utility model provides a coring simulation experiment device, include: simulating a shaft; the rock sample cylinder is arranged at the bottom of the simulated shaft and is used for containing a sample of a simulated stratum; a rig simulation mechanism for drilling; a drilling tool sealing mechanism for hermetically connecting the drilling machine simulation mechanism and the rock sample cylinder; the drilling fluid circulating mechanism is connected with the drilling machine simulation mechanism and can pressurize the inside of the drilling machine simulation mechanism; the drilling machine simulation mechanism comprises a pressure maintaining lifting mechanism and is used for lifting the core sample in a pressurized sealing state. The utility model discloses with sealing connection between each part of rig analog mechanism, drilling fluid circulation mechanism is connected with rig analog mechanism. With this arrangement, on the one hand, the drilling fluid circulation mechanism is able to simulate the drilling fluid circulation when working normally downhole; on the other hand, the drilling fluid circulating mechanism can pressurize the drilling machine simulation mechanism, so that the working state under the deep sea pressure environment can be simulated.

Description

Coring simulation experiment device

Technical Field

The utility model belongs to the technical field of the well drilling, specifically, relate to a coring simulation experiment device.

Background

During drilling of petroleum, natural gas and the like, drilling and coring are required to be carried out on a stratum, and various parameters of the obtained rock core are detected. According to the requirements of geological exploration work or engineering, the cylindrical rock sample taken out from the hole is the rock core by using the annular rock core drill bit and other coring tools.

With the further development of oil and gas, the deep sea drilling work is more and more. However, the various operating parameters required by the personnel for subsea work are still in the exploratory phase.

The working steps of coring, lifting and the like in the existing coring tool can only be carried out under normal pressure, the pressure in a drill string cannot be adjusted according to needs, the deep sea working environment is simulated, the working state of a key mechanism of the coring tool under the condition that the deep sea has absolute pressure cannot be integrally reflected, various working parameters required to be set for seabed working cannot be determined according to tests, and the coring tool can only be slowly groped in actual deep sea application, so that a large amount of manpower and material resources are wasted.

SUMMERY OF THE UTILITY MODEL

To the technical problem as above, the utility model aims at providing a coring simulation experiment device, it can be sealed the pressurization in rig analog mechanism, simulation deep sea pressure operational environment.

According to the utility model discloses, a coring simulation experiment device is provided, include: simulating a shaft; the rock sample cylinder is arranged at the bottom of the simulated shaft and is used for containing a rock core sample of a simulated stratum; a rig simulation mechanism for drilling; the drilling tool sealing mechanism is used for connecting the drilling machine simulation mechanism and the rock sample cylinder in a sealing manner; the drilling fluid circulating mechanism is connected with the drilling machine simulation mechanism and can pressurize the inside of the drilling machine simulation mechanism; the drilling machine simulation mechanism comprises a pressure maintaining lifting mechanism used for lifting the core sample in a pressurized sealing state.

In one embodiment, the drill rig simulation mechanism further comprises a simulated drill string and a drill tool assembly connected in sequence from top to bottom below the pressure maintaining uplift mechanism, the pressure maintaining uplift mechanism comprises: an outer barrel connected to the simulated drill string; the lifting rod is arranged in the outer cylinder in a sliding manner, and a piston used for being connected with the outer cylinder in a sealing manner is arranged on the lifting rod; the salvaging mechanism is connected with the lifting rod and is used for salvaging the rock core sample; the cylinder wall of the outer cylinder is provided with an upper pressure charging and releasing joint and a lower pressure charging and releasing joint, and the upper pressure charging and releasing joint and the lower pressure charging and releasing joint can be pressurized to push the piston to move, so that the lifting rod is controlled to move.

In one embodiment, the outer cylinder includes an upper connecting cylinder, a middle connecting cylinder and a lower connecting cylinder, an upper sealing joint and a lower sealing joint are respectively disposed between the upper connecting cylinder and the middle connecting cylinder and between the middle connecting cylinder and the lower connecting cylinder, the lifting rod is hermetically and slidably connected with the upper sealing joint and the lower sealing joint, the piston is located between the upper sealing joint and the lower sealing joint, the upper pressure charging and discharging joint is located between the piston and the upper sealing joint, and the lower pressure charging and discharging joint is located between the piston and the lower sealing joint.

In one embodiment, the drilling tool sealing mechanism comprises a lower flange plate, an upper flange plate and a first sealing joint, the lower flange plate is arranged at the top of the rock sample cylinder through a sealing element, the first sealing joint is arranged at the top of the upper flange plate through a sealing element, the upper flange plate and the lower flange plate are connected through bolts, and the first sealing joint is used for being connected with the drilling tool assembly.

In one embodiment, the first sealing joint comprises a connecting part and a circulating part arranged at the lower part of the connecting part, the inner diameter of the connecting part is smaller than that of the circulating part, and a water outlet joint is arranged on the circulating part and connected with the drilling fluid circulating mechanism.

In one embodiment, a wear sleeve and a sealing ring for sealing connection with the drilling assembly are provided inside the connection portion.

In one embodiment, the fishing mechanism comprises a rope joint used for being connected with the lower connecting cylinder, a steel wire rope arranged at the lower end of the rope joint and a fishing head arranged at the lower end of the steel wire rope, the fishing head is used for fishing samples drilled by the simulation mechanism of the drilling machine, and a through hole used for circulating drilling fluid is arranged on the rope joint.

In one embodiment, the drilling rig simulation mechanism further comprises a simulation drill string detachably and hermetically arranged at the lower end of the pressure maintaining lifting mechanism.

In one embodiment, the simulated drill string is connected to the pressure maintaining uplift mechanism through a hoop.

In one embodiment, the hoop comprises two semicircular hoops, and the two hoops are connected through bolts.

In one embodiment, a rotation stopping screw is arranged on the clamping hoop in the radial direction, and the rotation stopping screw can abut against the simulation drill string and the pressure maintaining lifting mechanism and is used for enabling the simulation drill string and the pressure maintaining lifting mechanism to rotate synchronously.

In one embodiment, a sealing ring for sealing connection of the simulation drill string and the pressure maintaining lifting mechanism is arranged at the connection position of the simulation drill string and the pressure maintaining lifting mechanism.

Compared with the prior art, the method has the following advantages.

The utility model discloses with sealing connection between each part of rig analog mechanism, drilling fluid circulation mechanism is connected with rig analog mechanism. With this arrangement, on the one hand, the drilling fluid circulation mechanism is able to simulate the circulation of drilling fluid when working normally downhole; on the other hand, the drilling fluid circulating mechanism can pressurize the drilling machine simulation mechanism, so that the working state under the deep sea pressure environment can be simulated.

Drawings

The present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a schematic structural view of an embodiment of a coring simulation experiment device according to the present invention;

fig. 2 shows a schematic structural view of the pressure maintaining lifting mechanism according to the present invention;

FIG. 3 shows a schematic structural view of a fishing mechanism according to the present invention;

fig. 4 shows a schematic structural view of a sealing mechanism of a drilling tool according to the present invention;

FIG. 5 shows a schematic structural view of a wellhead chuck according to the present invention;

fig. 6 shows a schematic structural view of the hoop according to the present invention;

fig. 7 shows a schematic top view cross-sectional structure of the hoop according to the present invention.

In the figure: 1. simulating a shaft; 2. a rock sample cylinder; 21. a base; 22. a base seal ring; 23. positioning holes; 3. a rig simulation mechanism; 31. drilling tool assembly; 32. a pressure maintaining lifting mechanism; 321. an upper connecting cylinder; 322. a middle connecting cylinder; 323. a lower connecting cylinder; 324. an upper sealing joint; 325. a lower sealing joint; 326. lifting a pull rod; 327. a piston; 328. charging and discharging a pressure joint; 329. a lower charging pressure relief joint; 33. simulating a drill string; 34. simulating a drilling machine; 4. a drilling fluid circulation mechanism; 41. a first connecting pipe; 42. a second connection pipe; 5. a drilling tool sealing mechanism; 51. a lower flange plate; 52. an upper flange plate; 53. a first sealing joint; 531. a connecting portion; 532. a circulating part; 533. a water outlet joint; 534. an anti-wear sleeve; 54. a flange bolt; 55. sealing a flange; 56. connecting a sealing ring; 57. water is filled into the sleeve; 6. a salvaging mechanism; 61. a rope joint; 62. a wire rope; 63. fishing the head; 64. a clip; 65. a through hole; 7. a wellhead chuck; 71. a wellhead base; 72. a first fixed disk; 73. a base bolt; 74. a second fixed disk; 75. a hoisting ring; 76. a two-layer base; 8. hooping; 81. clamping a hoop; 82. a rotation stopping screw; 83. a seal ring; 831. an O-shaped sealing ring; 84. a hoop joint; 85. a clamp bolt; 9. the drilling machine slides the base.

In the present application, all the figures are schematic and are only intended to illustrate the principles of the present invention and are not drawn to scale.

Detailed Description

In the present application, it should be noted that directional terms or qualifiers "upper" and "lower" used in the present application are all referred to fig. 1. They are not intended to limit the absolute positions of the parts involved, but may vary from case to case.

Fig. 1 shows a schematic structural diagram of an embodiment of a coring simulation experiment device 100 according to the present invention. As shown in fig. 1, the coring simulation experiment apparatus 100 includes a simulation wellbore 1, a rock sample barrel 2, a drilling machine simulation mechanism 3, and a drilling fluid circulation mechanism 4. In the embodiment, the depth of the simulated well bore 1 is 20 meters, the rock sample cylinder 2 is fixedly arranged at the bottom in the simulated well bore 1, and the rock sample cylinder 2 is used for placing a sample of the simulated stratum. As shown in fig. 4, a base 21 is provided at the bottom of the rock sample cylinder 2 by screw sealing, and a base packing 22 is provided between the base 21 and the rock sample cylinder 2. The bottom of the base 21 is provided with a positioning hole 23, and the positioning hole 23 is used for fixedly connecting the rock sample cylinder 2 with the simulation shaft 1.

As shown in fig. 1, a drilling rig simulation mechanism 3 is slidably disposed within a simulated wellbore 1 for drilling a core from a rock sample barrel 2. The drilling fluid circulation mechanism 4 is connected with two ends of the drilling machine simulation mechanism 3 through a first connecting pipe 41 and a second connecting pipe 42 respectively. The drilling fluid circulating mechanism 4 can play a role in circulating drilling fluid in the prior art, and can apply pressure to the inside of the drilling machine simulation mechanism 3, so that the deep sea pressure environment can be simulated. Namely, in the process of drilling a core sample in the rock sample barrel 2 by the drilling machine simulation mechanism 3, the drilling fluid is circulated into the core sample barrel by the drilling fluid circulation mechanism 4; during the process of taking out the core sample, after the first connection pipe 41 is closed, the drilling fluid circulation mechanism 4 pressurizes the drilling machine simulation mechanism 3 through the second connection pipe 42, thereby simulating the working state of extracting the core from the deep sea. The drilling machine simulation mechanism 3 needs to move in the vertical direction to complete drilling of the rock core, and therefore a drilling tool sealing mechanism 5 capable of sealing the drilling machine simulation mechanism 3 in a sliding mode is arranged at the top of the rock sample barrel 2.

As shown in fig. 4, in one particular embodiment, the drill sealing mechanism 5 includes a lower flange plate 51, an upper flange plate 52, and a first sealing joint 53. The lower flange 51 is fixedly arranged at the top end of the rock sample cylinder 2, the upper flange 52 is arranged at the upper part of the lower flange 51, the first sealing joint 53 is fixedly arranged at the top end of the upper flange 52, the lower flange 51 and the upper flange 52 are connected through flange bolts 54, and a flange seal 55 is arranged between the lower flange 51 and the upper flange 52. The first sealing joint 53 includes a connection portion 531 and a circulating portion 532 disposed at a lower portion of the connection portion 531, and an inner diameter of the connection portion 531 is smaller than an inner diameter of the circulating portion 532. Further, a wear prevention sleeve 534 and a connection seal 56 are provided in the connection portion 531. In this way, the drill simulation mechanism 3 can be sealingly inserted from the upper part of the tool sealing mechanism 5, thereby sealing the drill simulation mechanism 3. The circulation unit 532 is provided with a water outlet 533, and the water outlet 533 is connected to the first connection pipe 41. The second connection pipe 42 is connected to the top of the drill simulation mechanism 3. With this arrangement, the drilling fluid circulating mechanism 4 injects the drilling fluid into the drilling machine simulation mechanism 3 through the second connecting pipe 42, and then flows out from the bottom of the drilling machine simulation mechanism 3, returns to the water outlet joint 533 from the annular space between the drilling machine simulation mechanism 3 and the rock sample barrel 2, and then passes through the first connecting pipe 41 to the drilling fluid circulating mechanism 4, so as to form circulation. In addition, in this sealing manner, the drill simulation mechanism 3 can be extended into the core barrel 2 in the vertical direction and move downward while rotating to drill the core sample.

It will be readily appreciated that the drilling fluid circulation mechanism 4 is prior art and will not be described in detail herein.

In a preferred embodiment, a water pressure sleeve 57 is disposed in the first sealing joint 53, and a water outlet hole is disposed in the water pressure sleeve 57 at a position corresponding to the water outlet joint 533. With this arrangement, the water passage pressure sleeve 57 can reinforce the strength of the first sealing joint 53.

As shown in fig. 1, according to the present invention, the drilling machine simulation mechanism 3 includes a pressure maintaining lifting mechanism 32, a simulation drill string 33 and a drilling tool assembly 31 which are connected in sequence from top to bottom. The pressure maintaining lifting mechanism 32 can complete the process of lifting the core sample under the condition that the inside of the drilling machine simulation mechanism 3 is in a high-pressure sealed simulated deep sea environment.

It will be readily appreciated that the drilling assembly 31 is of the prior art and, in this embodiment, is used to drill a core sample into the sample barrel 2 and will not be described in detail herein. Meanwhile, in the existing actual drilling process, after the core is drilled, the drilling machine at the top of the drill string of the drilling machine simulation mechanism 3 needs to be disassembled, and then the core is lifted out by using a truss crane or other hoisting modes. In the process, the pressure inside the drill string is consistent with the external pressure, and the deep sea working environment cannot be simulated. The utility model discloses a mechanism 32 is lifted in pressurize can keep lifting of rock core sample under the condition of inside seal with the separation of simulation drilling string 33 not. It is thus possible to simulate a deep sea pressure environment by pressurizing the inside of the simulated drill string 33, in which the core sample is lifted.

As shown in fig. 2, according to a specific embodiment of the present invention, the pressure maintaining lifting mechanism 32 includes an outer cylinder and a lifting rod 326 slidably disposed in the outer cylinder. Wherein, the outer cylinder comprises an upper connecting cylinder 321, a middle connecting cylinder 322 and a lower connecting cylinder 323 which are connected in sequence from top to bottom. The upper connecting cylinder 321 and the middle connecting cylinder 322 are connected through an upper sealing joint 324, the middle connecting cylinder 322 and the lower connecting cylinder 323 are connected through a lower sealing joint 325, and the inner diameters of the upper sealing joint 324 and the lower sealing joint 325 are smaller than those of the upper connecting cylinder 321, the middle connecting cylinder 322 and the lower connecting cylinder 323 and are in sealing abutment with the outer wall of the lifting rod 326. The length of the lifting rod 326 is greater than that of the middle connecting cylinder 322, and a piston 327 is fixedly arranged on the lifting rod 326. The piston 327 is positioned between the upper sealing joint 324 and the lower sealing joint 325 in sliding sealing engagement with the middle connector barrel 322. An upper charge and discharge joint 328 and a lower charge and discharge joint 329 are provided at the upper sealing joint 324 and the lower sealing joint 325, respectively. The upper pressure charging and discharging joint 328 is used for charging or discharging the sealed space between the piston 327 and the upper sealing joint 324, and the lower pressure charging and discharging joint 329 is used for charging or discharging the sealed space between the piston 327 and the lower sealing joint 325. That is, the piston 327 forms a sealed chamber with the upper and

lower sealing joints

324 and 325, respectively, and the upper and lower charging and discharging

joints

328 and 329 communicate with the two sealed chambers, respectively. In this arrangement, the upper and lower charging and discharging

connectors

328, 329 can cooperate with each other to charge or discharge the medium, thereby cooperating with the piston 327 to move the lifting rod 326 in a vertical direction. A salvaging mechanism 6 for salvaging the rock core sample is arranged at the bottom end of the lifting rod 326. Through the arrangement, the pressure maintaining lifting mechanism 32 can move the lifting rod 326 upwards in a pressurized sealing environment in the drilling machine simulation mechanism (3), and the lifting rod 326 lifts a rock core sample through the fishing mechanism 6, so that the aim of simulating the lifting of the rock core in deep sea is achieved, and relevant parameters of the lifting rock core in deep sea are measured on the basis.

As shown in fig. 3, it will be readily appreciated that the lifting rod 326 is a hollow cylinder type for circulating drilling fluid. The top of the upper connecting cylinder 321 is connected with the analog drilling machine 34 through threads, and the lower connecting cylinder 323 is connected with the analog drilling string 33.

In one particular embodiment, the bottom end of the drag link 326 is threadably connected to the fishing mechanism 6. The salvaging mechanism 6 is used for extending into the drilling machine simulation mechanism 3 to reach the bottom of the drilling tool assembly 31 and salvaging the rock core sample. The fishing mechanism 6 includes a rope nipple 61, a wire rope 62, and a fishing head 63. The upper end of the rope connector 61 is connected with the lifting rod 326 through threads, the lower end of the rope connector 61 is connected with the steel wire rope 62 through a special clamp 64 for the steel wire rope, and the lower end of the steel wire rope 62 is fixedly connected with the fishing head 63 through the clamp 64. The fishing head 63 is used for fishing core samples, and is the prior art.

In one particular embodiment, as shown in fig. 1, the pressure maintaining riser 32 is connected to the dummy drill string 33 via a hoop 8. Through the setting of staple bolt 8, make pressurize lifting mechanism 32 and the dismouting that simulation drill string 33 can be quick. As shown in fig. 6 and 7, the anchor ear 8 includes two semicircular clips 81, and the two clips 81 are fixedly connected by a clip bolt 85. A hoop connector 84 is arranged at the bottom of the pressure maintaining lifting mechanism 32 and at the top of the simulation drill string 33 and is used for being matched and connected with the hoop 8. A sealing ring 83 is arranged at the joint of the bottom of the pressure maintaining lifting mechanism 32 and the simulation drill string 33, and an O-shaped sealing ring 831 is arranged between the sealing ring 83 and the contact surfaces of the pressure maintaining lifting mechanism 32 and the simulation drill string 33. By this arrangement, the pressure maintaining lifting mechanism 32 and the dummy drill string 33 are sealingly connected. Meanwhile, in order to transmit the torque of the analog drill 34 to the analog drill string 33 through the pressure maintaining lifting mechanism 32, a rotation stop screw 82 is provided in a radial direction of the collar 81. The anti-rotation screw 82 can abut against the dwell lifter 32 and the simulated drill string 33 so that the dwell lifter 32 can transmit torque to the simulated drill string 33.

As shown in fig. 1, in a specific embodiment, a drilling machine sliding base 9 is arranged on the top of the simulated well bore 1, and a pressure maintaining lifting mechanism 32 is arranged on the sliding base 9. In this embodiment, the manner of starting the core sample of the analog drilling machine at normal pressure is the same as that of the prior art, except that the process of taking out the core in the deep sea environment is simulated, and the following steps are included.

Putting the fishing mechanism 6 into: the anchor ear 8 is removed from the packing unit 32 and the simulated drill string 33, and the packing unit 32 is removed from the simulated drill string 33 by the drill slide bed 9. The fishing mechanism 6 is lowered into the simulated drill string using a truss hoist and the rope nipple 61 is threaded onto the lower end of the lifting rod 326 of the pressure maintaining lifting mechanism 32. The pressure maintaining lifting mechanism 32 connected with the lifting rod 326 is reset by using the drill sliding base 9 and is connected with the simulation drill string. It will be readily appreciated that the length of the wireline 62 has been measured in advance to enable the fishing head 63 to be brought into contact with the core sample. The fishing head 63 is prior art and is used for grabbing a core sample.

Circulating the drilling fluid: and the drilling fluid circulating mechanism 4 is started, so that the drilling fluid returns to the drilling fluid circulating mechanism 4 through the second connecting pipe 42, the simulation drilling machine 34, the upper connecting cylinder 321, the lifting rod 326, the through hole 65 on the rope connector 61, the simulation drill string 33, the drilling tool assembly 31, the annular space between the drilling tool assembly 31 and the rock sample cylinder 2, the water outlet connector 533 and the first connecting pipe 42 in sequence to complete circulation.

Coring by a drilling machine: the simulation drilling machine 34 is started, and the torque is transmitted to the pressure maintaining lifting mechanism 32, the simulation drill string 33 and the drilling tool assembly 31 in sequence, so that the simulated formation sample in the rock sample cylinder 2 is drilled. It will be readily appreciated that the analog drill 34, in addition to being capable of generating torque, also includes hydraulic cylinders that are capable of moving up and down to drive the drill assembly 31 downward to complete the drilling. This is prior art and will not be described herein.

Simulating a deep sea environment to lift the rock core: the first connection pipe 41 is closed and the drilling fluid circulation means 4 is pressurized into the drilling rig simulation means 3 through the second connection pipe 42. After reaching the predetermined pressure, the pressurization is stopped and the pressure is maintained. The pumping pressure is then applied from the under fill and relief fitting 329 through the line, in this embodiment by a hand pump. Lower charge and discharge fitting 329 charges the sealed space between piston 327 and lower sealing fitting 325. The lifting rod 326 moves upwards under the action of the piston 327, so that the fishing mechanism 6 is driven to move upwards, and the core sample is driven to move upwards. The piston 327 moves up to the upper sealing joint 324 to the top of the stroke, completing the process of simulating core lifting in a deep sea environment.

At this point, the pressure in the rig simulation mechanism 3 is removed, the anchor ear 8 is opened, and the pressure maintaining uplift mechanism 32 is removed from the top of the simulation drill string 33 using the rig sliding bed 9. And taking out the salvaging mechanism 6 through the truss crane, and taking out the core sample.

In a particular embodiment, the rig simulation mechanism 3 and the first connection pipe 41 are connected to the simulated wellbore 1 via a wellhead spider 7. The wellhead chuck 7 comprises a wellhead base 71 fixedly connected with the simulation shaft 1, and a first fixed disc 72 and a second fixed disc 74 which are arranged on the wellhead base 71. The first fixing plate 72 is used for slidably connecting with the drilling machine simulation mechanism 3, and the second fixing plate 74 is used for fixedly connecting with the first connecting pipe 41. A two-layer base 76 for reinforcement is further arranged between the first fixing disc 72 and the wellhead base 71, and the two-layer base 76 is fixedly connected with the wellhead base 71 through a base bolt 73. A hanging ring for hoisting is also arranged on the first fixed disk 72.

It will be readily appreciated that the drill slide base 9 is of the prior art and is used to move the pressure maintaining lifting mechanism 32 into the fishing mechanism 6.

The utility model discloses a setting seal structure between each part to the adoption is filled the pressure release and is connected 328 and fill the cooperation of pressure release joint 329 down, accomplishes shifting up of salvage mechanism 6 under pressure environment, thereby accomplishes the experiment that the simulation deep sea environment was cored. Avoid the loss brought by testing in the actual production process.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and should not be construed as limiting the present invention in any way. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A coring simulation experiment device, comprising:

a simulated wellbore (1);

the rock sample cylinder (2) is arranged at the bottom of the simulated shaft (1), and a rock core sample of a simulated stratum is contained in the rock sample cylinder (2);

a drill rig simulation mechanism (3) for drilling;

a drilling tool sealing mechanism (5) which hermetically connects the drilling machine simulation mechanism (3) and the rock sample cylinder (2);

the drilling fluid circulating mechanism (4) is connected with the drilling machine simulation mechanism (3), and the drilling fluid circulating mechanism (4) can pressurize the inside of the drilling machine simulation mechanism (3);

wherein the drilling machine simulation mechanism (3) comprises a pressure-maintaining lifting mechanism (32) which is used for lifting the core sample in a pressurized sealing state.

2. The coring simulation experiment device according to claim 1, wherein the drill simulation mechanism (3) further comprises a simulation drill string (33) and a drill assembly (31) connected to a lower portion of the pressure holding lifting mechanism (32) in this order from top to bottom, and the pressure holding lifting mechanism (32) comprises:

an outer drum connected to the mock drill string (33);

the lifting rod (326) is arranged in the outer cylinder in a sliding mode, and a piston (327) which is used for being connected with the outer cylinder in a sealing mode is arranged on the lifting rod (326);

and a salvage mechanism (6) connected with the lifting rod (326) and used for salvaging the core sample;

the cylinder wall of the outer cylinder is provided with an upper pressure charging and discharging joint (328) and a lower pressure charging and discharging joint (329), and the upper pressure charging and discharging joint (328) and the lower pressure charging and discharging joint (329) can charge pressure to push the piston (327) to move, so that the lifting rod (326) is controlled to move.

3. The coring simulation experiment device of claim 2, wherein the outer cylinder comprises an upper connecting cylinder (321), a middle connecting cylinder (322) and a lower connecting cylinder (323), an upper sealing joint (324) and a lower sealing joint (325) are respectively arranged between the upper connecting cylinder (321) and the middle connecting cylinder (322) and between the middle connecting cylinder (322) and the lower connecting cylinder (323), the lifting rod (326) is in sealing sliding connection with the upper sealing joint (324) and the lower sealing joint (325), the piston (327) is located between the upper sealing joint (324) and the lower sealing joint (325), the upper charging and discharging joint (328) is located between the piston (327) and the upper sealing joint (324), and the lower charging and discharging joint (329) is located between the piston (327) and the lower sealing joint (325).

4. The coring simulation experiment device of claim 3, wherein the drill sealing mechanism (5) comprises a lower flange (51), an upper flange (52) and a first sealing joint (53), the lower flange (51) is arranged on the top of the rock sample barrel (2) through a sealing element, the first sealing joint is arranged on the top of the upper flange (52) through a sealing element, the upper flange (52) and the lower flange (51) are connected through a bolt, and the first sealing joint (53) is used for being connected with the drill assembly (31).

5. The coring simulation experiment device according to claim 4, wherein the first sealing joint (53) comprises a connecting portion (531) and a circulating portion (532) provided at a lower portion of the connecting portion (531), an inner diameter of the connecting portion (531) is smaller than an inner diameter of the circulating portion (532), a water outlet joint (533) is provided on the circulating portion (532), and the water outlet joint (533) is connected to the drilling fluid circulating mechanism (4).

6. The coring simulation experiment device of claim 5, wherein an anti-wear sleeve (534) and a sealing ring for sealing connection with the drilling assembly (31) are arranged inside the connecting portion (531).

7. The coring simulation experiment device according to claim 6, wherein the fishing mechanism (6) comprises a rope connector (61) used for being connected with the lower connecting cylinder (323), a steel wire rope (62) arranged at the lower end of the rope connector (61), and a fishing head (63) arranged at the lower end of the steel wire rope (62), the fishing head (63) is used for fishing samples drilled by the drilling machine simulation mechanism (3), and a through hole (65) used for circulating drilling fluid is arranged on the rope connector (61).

8. The coring simulation experiment device of claim 7, wherein the rig simulation mechanism (3) further comprises a simulation drill string (33) detachably sealingly disposed at a lower end of the pressure maintaining lifting mechanism (32).

9. The coring simulation experiment device of claim 8, wherein the simulation drill string (33) and the pressure maintaining lifting mechanism (32) are connected by a hoop (8).

10. The coring simulation experiment device of claim 9, wherein the hoop (8) comprises two semicircular clips (81), and the two clips (81) are connected through bolts.

11. The coring simulation experiment device of claim 10, wherein a rotation stop screw (82) is radially disposed on the collar (81), the rotation stop screw (82) being capable of abutting against the simulation drill string (33) and the pressure maintaining lifting mechanism (32) for synchronous rotation of the simulation drill string (33) and the pressure maintaining lifting mechanism (32).

12. The coring simulation experiment device of claim 11, wherein a sealing ring (83) is provided at the connection of the simulation drill string (33) and the pressure maintaining lifting mechanism (32) to sealingly connect the two.