CN210982160U

CN210982160U - Mud dynamic pollution experiment system

Info

Publication number: CN210982160U
Application number: CN201921954904.2U
Authority: CN
Inventors: 臧克一; 武新民; 李鑫; 马成; 欧阳静芸; 张艺久; 杜新龙; 黄海平; 曹丽娜; 徐超; 夏冰; 刘卉; 符奇; 程洋; 邓强
Original assignee: Chengdu North Oil Exploration Development Technology Co ltd
Current assignee: Chengdu North Oil Exploration Development Technology Co ltd
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2020-07-10
Anticipated expiration: 2029-11-13

Abstract

The utility model discloses a mud dynamic pollution experimental system, including rock core holder, mud container, with the mud circulating device that the mud container links to each other, mud circulating device is used for the one end input dynamic mud to the rock core holder, the one end that mud circulating device was kept away from to the rock core holder communicates to the liquid metering cup. An object of the utility model is to provide a mud developments pollution experiment system to there is the great, limited problem of accuracy in the simulation of mud developments pollution experiment among the solution prior art error, realizes the purpose that the more accurate simulation wall of a well is invaded the polluted state by the drilling fluid.

Description

Mud dynamic pollution experiment system

Technical Field

The utility model relates to an oil gas field stratum evaluation field, concretely relates to mud dynamic pollution experimental system.

Background

With the continuous deepening of the knowledge of the stratum and the continuous refinement of the development and planning of the oil and gas field, the pollution and damage of the drilling fluid (mud) to the stratum around the shaft have become a main research subject for increasing the yield of the oil and gas field. Wherein, the traditional skin coefficient is calculated by a formula; the existing mud pollution experiment applies rigid confining pressure and static wellbore pressure to a full-diameter core for simulation. And the mud pollution experimental apparatus in the prior art is too static, the applied drilling fluid simulates the hydrostatic column pressure in the well, and the suction pressure and the exciting pressure of the mud in the well are ignored. Comprehensively, in the prior art, the research on the full-diameter core slurry pollution damage mechanism has the defects of large size of a core holder, high difficulty in sealing and slurry dynamic circulation simulation, and further limited simulation accuracy. Therefore, a new dynamic pollution implementation device of mud which can be closer to the formation state needs to be designed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a mud developments pollution experiment system to there is the great, limited problem of accuracy in the simulation of mud developments pollution experiment among the solution prior art error, realizes the purpose that the more accurate simulation wall of a well is invaded the polluted state by the drilling fluid.

The utility model discloses a following technical scheme realizes:

the mud dynamic pollution experiment system comprises a core holder, a mud container and a mud circulating device connected with the mud container, wherein the mud circulating device is used for inputting dynamic mud to one end of the core holder, and one end, far away from the mud circulating device, of the core holder is communicated to a liquid metering cup.

The simulation to mud dynamic pollution experiment among the prior art has the problem that the error is great, the accuracy is limited, the utility model provides a mud dynamic pollution experiment system, the mud container links to each other with mud circulating device, and the both ends of rock core holder link to each other with mud circulating device, liquid metering cup respectively. When the device is used, the slurry circulation device sucks slurry from the slurry container, then the slurry is input into the core holder to simulate the dynamic circulation of the slurry in a well, the liquid metering cup is used for standby, and when the slurry pollutes the core and soaks the core, the slurry enters the liquid metering cup. The system can be used for simulating that the tested rock core can be thoroughly polluted under the mud circulating pressure of the tested rock core, and can also be used for judging the pollution degree of the mud to the rock core under the circulating pressure in the well. This application is when using, can monitor the pressure of the one end that core holder and mud circulating device link to each other through arbitrary prior art, make this pressure equal hydrostatic column pressure and suction pressure or excit the pressure sum in the well, thereby solved among the prior art mud dynamic pollution experiment, all experiment through the mode of simulation hydrostatic column pressure, neglected suction pressure and excitement pressure's defect, make the experimental result of this application more be close to the actual pollution condition in the reservoir, show the experiment accuracy that improves this application.

Furthermore, the mud circulating device comprises a single-cylinder double-acting piston pump, the single-cylinder double-acting piston pump comprises a piston cylinder, a piston rod and a piston, the piston rod is matched with the piston cylinder, and two output ends of the single-cylinder double-acting piston pump are communicated with one end of the core holder. The application carries out mud circulation through single cylinder double acting pump. The two sides of the piston of the single-cylinder double-acting pump are output ends, and the piston can output no matter which direction the piston moves, so that the mud can be continuously input into a measured rock core in a mud dynamic pollution experiment.

Furthermore, a first pressure gauge is arranged in the slurry container, and a second pressure gauge is arranged on a connecting pipeline between the rock core holder and the liquid measuring cup. The first pressure gauge is used for monitoring the pressure in the slurry container, and the second pressure gauge is used for monitoring the pressure at the output end of the rock core holder.

Further, the core holder comprises a sleeve, a first plug and a second plug which are detachably connected to two ends of the sleeve, a diaphragm is arranged in the sleeve, the diaphragm is surrounded into a cylindrical structure coaxial with the sleeve, the diaphragm is a core holding area surrounding a formed hollow area, a confining pressure area is arranged between the outer wall of the diaphragm and the inner wall of the sleeve, and a pressurizing opening communicated with the confining pressure area is formed in the surface of the sleeve. In the prior art, a core holder provides a simulated confining pressure for a core through a rigid sleeve or a shell, the simulation mode is substantially to see a reservoir surrounding rock as a fully compact lithology approaching a pure rigid body, however, in a mud dynamic pollution experiment, dynamic mud is required to act on the surface of the core to test the pollution rate and degree of the core, in the process, the actual size of the confining pressure influences the permeation rate of the mud in the core, and the prior art ignores the point. Therefore, the diaphragm is arranged in the sleeve, the diaphragm surrounds into a cylindrical structure coaxial with the sleeve, and a confining pressure area is arranged between the outer wall of the diaphragm and the inner wall of the sleeve. This scheme is when using, pack into the core in the sleeve and make the core be located the diaphragm inside, pressurize in to the confined pressure district through the pressure port for pressure in the confined pressure district reaches actual reservoir confined pressure, and the confined pressure is pressed the diaphragm on surveyed core surface, thereby realizes the purpose of more accurate simulation reservoir actual conditions, makes the accuracy of mud dynamic pollution experiment greatly improve. The diaphragm in this scheme has the ductility, consequently can ensure under the confining pressure effect of artifical application, with the inseparable effect of pasting on the rock core surface of diaphragm, realizes transmitting the confining pressure to being surveyed the rock core through the diaphragm on. Preferably, the diaphragm is a non-porous and waterproof rubber sheet or a silica gel sheet. Preferably, the inner diameter of the cylindrical structure formed by the diaphragm in the scheme is consistent with the coring inner diameter of the coring barrel used.

Further, sleeve both ends all set up the convex annular boss of orientation sleeve inside direction, diaphragm and the radial outside one side surface fixed connection of annular boss. This scheme is passed through the annular boss that the sleeve both ends inwards stretched out, for the diaphragm provides the installation station, ensures the relatively fixed between diaphragm and the sleeve. Simultaneously, through the annular bosses at the two ends, a more stable installation station is provided for the first plug and the second plug, and mutual interference between the plugs and the diaphragm is avoided. The diaphragm is connected at the radial lateral surface outwards of annular boss to make confined pressure district pressurization back, the confined pressure can realize the self-sealing effect with the inseparable pressure of diaphragm on the annular boss at both ends through the cooperation of confined pressure and diaphragm, and then solved prior art, in the full diameter rock core mud dynamic pollution experimentation, the problem of the sealed difficulty of rock core holder. In this scheme, the confined pressure that applys is big more, and sealed effect is better.

Further, the diaphragm comprises a cylindrical main body part, and two ends of the main body part are sealing parts; the outer diameters of the main body part and the sealing part are equal, and the inner diameter of the main body part is smaller than that of the sealing part; the two ends of the main body part are respectively abutted against the annular bosses at the two ends, and the inner wall of the sealing part is attached to the surface of one side, facing outwards in the radial direction, of the annular boss. That is to the diaphragm, the main part is thicker, and the sealing is thinner, and the annular boss that leans on both ends respectively at the both ends of main part ensures sealedly, and the sealing pastes at the radial outside lateral surface of annular boss to make fully to wrap up between the tip of diaphragm and annular boss, no matter be the terminal surface of annular boss, or its lateral surface, all can fully contact with the diaphragm, thereby eliminate the gap, further improve the sealing performance of this application.

Further, the sealing part is bonded with the annular boss or/and connected with the annular boss through a bolt; one end, facing the interior of the sleeve, of the first plug is provided with a circle of annular gap, and one end of the main body portion is abutted to the annular gap. The best mode is that firstly, the whole body is bonded between the two curved surfaces, and then, the bolt is used for further fastening. The bonding mode can further eliminate the gap and improve the sealing capability, and the bolt connection mode can ensure relative fixation. In order to avoid sealing failure between first end cap and the sleeve, this scheme sets up round annular breach towards the inside one end of sleeve at first end cap, and the one end of the main part of diaphragm is supported and is held together in the annular breach, and the one end of diaphragm main part fills completely promptly in the annular breach, comes the gap on the terminal surface including first end cap of shutoff and sleeve through the terminal surface of main part, and under the confining pressure effect, can also be in with the main part pressure on the annular breach, all realize sealedly in the follow each side, show to improve and realize the effect of self sealedly through the diaphragm. In the scheme, one end of the first plug in the direction is used as the outlet end of the rock core holder.

Furthermore, after the first plug and the end part of the sleeve are connected in place, the outer end of the first plug along the axis direction is flush with the end part of the sleeve, and the outer end of the annular gap along the axis direction is flush with the corresponding annular boss; one end face, facing the interior of the sleeve, of the second plug is in contact with one end of the main body part along the axis direction. After first end cap installation is accomplished promptly, satisfy first end cap and flush along the outer end and the sleeve tip of axis direction, annular breach and annular boss also flush to make the tip of diaphragm main part can be supported and close up on the stable plane that annular breach and annular boss formed, avoid the diaphragm main part to support and close up the problem that the position is uneven leads to sealed inefficacy. Similarly, the end face gap of the second plug is plugged through the end part of the main body part, and the sealing effect of one end of the second plug is improved. Preferably, one end of the main body part close to the second plug is partially in contact with the second plug and partially in contact with the annular boss on the side, so that the gap between the second plug and the annular boss is plugged through the main body part.

Furthermore, a liquid outlet channel is arranged on the first plug, and two circulating channels and a back pressure blockage removing channel are arranged on the second plug. The mud circulating device is a single-cylinder double-acting piston pump, the end, facing the inside of the sleeve, of the second plug is provided with an anti-compression ring, the anti-compression ring is in interference fit with the diaphragm, the two circulating channels are communicated to an area formed by the anti-compression ring in a surrounding mode, and the two circulating channels are communicated to two output ends of the single-cylinder double-acting piston pump respectively. In this scheme, two output ends of single cylinder double-acting pump link to each other with two circulation channel respectively, and at the during operation, can make mud reverse motion in turn at the rock core tip to simulate out the continuous suction pressure and the excitement pressure of getting up in the well, the in-process mud that drills down, obtain more accurate wall of a well injury analog result.

Compared with the prior art, the utility model, following advantage and beneficial effect have:

1. the utility model discloses mud dynamic pollution experimental system has solved among the prior art mud dynamic pollution experiment, all is experimenting, neglected suction pressure and excited pressure's defect through the mode of simulation hydrostatic column pressure for the experimental result of this application is close the in situ actual pollution condition of storage more, is showing the experiment accuracy that improves this application.

2. The utility model discloses mud dynamic pollution experimental system packs the rock core into in the sleeve and makes the rock core be located inside the diaphragm, pressurizes to confined pressure district through the pressure port for pressure in the confined pressure district reaches actual reservoir confined pressure, and the confined pressure is pressing the diaphragm on surveyed rock core surface, thereby realizes the purpose of more accurate simulation reservoir actual conditions, makes the accuracy of mud dynamic pollution experiment greatly improve.

3. The utility model discloses mud dynamic pollution experimental system, confined pressure district pressurization back, confined pressure can realize the automatic sealing effect with the inseparable pressure of diaphragm on the annular boss at both ends through the cooperation of confined pressure and diaphragm, and then solved prior art, the problem of the sealed difficulty of rock core holder among the full diameter rock core mud dynamic pollution experimentation.

4. The utility model discloses mud dynamic pollution experimental system at the during operation, can make mud reverse motion in turn at the rock core tip to simulate out the continuous suction pressure and the excitement pressure of the in-process mud of getting up in the well, going down, obtain more accurate wall of a well injury analog result.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic connection diagram of an embodiment of the present invention;

fig. 2 is a cross-sectional view of a core holder in an embodiment of the invention;

fig. 3 is a schematic diagram of a diaphragm according to an embodiment of the present invention.

Reference numbers and corresponding part names in the drawings:

1-sleeve, 2-first plug, 201-annular notch, 3-second plug, 4-diaphragm, 401-main body part, 402-sealing part, 5-core holding area, 6-confining area, 7-pressurizing port, 8-liquid outlet channel, 9-circulating channel, 10-annular boss, 11-bolt, 12-compression resisting ring, 13-core holder, 14-slurry container, 15-liquid metering cup, 16-piston cylinder, 17-piston rod, 18-piston, 19-first pressure gauge, 20-second pressure gauge and 21-back pressure unblocking channel.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Example 1:

the mud dynamic pollution experiment system shown in fig. 1 comprises a core holder 13, a mud container 14 and a mud circulating device connected with the mud container 14, wherein the mud circulating device is used for inputting dynamic mud to one end of the core holder 13, and one end, far away from the mud circulating device, of the core holder 13 is communicated to a liquid metering cup 15. The mud circulating device comprises a single-cylinder double-acting piston pump, the single-cylinder double-acting piston pump comprises a piston cylinder 16, a piston rod 17 and a piston 18, the piston rod 17 is matched with the piston cylinder 16, and two output ends of the single-cylinder double-acting piston pump are communicated with one end of a rock core holder 13. A first pressure gauge 19 is arranged in the slurry container 14, and a second pressure gauge 20 is arranged on a connecting pipeline between the core holder 13 and the liquid measuring cup 15.

Example 2:

as shown in fig. 1 to 3, on the basis of embodiment 1, the core holder 13 includes a sleeve 1, a first plug 2 and a second plug 3 detachably connected to two ends of the sleeve 1, a diaphragm 4 is disposed in the sleeve 1, the diaphragm 4 surrounds a cylindrical structure coaxial with the sleeve 1, a hollow area formed by the diaphragm 4 around is a core holding area 5, a confining pressure area 6 is disposed between an outer wall of the diaphragm 4 and an inner wall of the sleeve 1, and a pressure port 7 communicated with the confining pressure area 6 is disposed on a surface of the sleeve 1.

Example 3:

in the dynamic slurry pollution experiment system shown in fig. 1 to fig. 3, on the basis of any of the above embodiments, the two ends of the sleeve 1 are provided with the annular bosses 10 protruding towards the inner direction of the sleeve 1, and the diaphragm 4 is fixedly connected with one side surface of the annular boss 10 facing radially outwards. The diaphragm 4 includes a cylindrical main body 401, and both ends of the main body 401 are sealed portions 402; the outer diameters of the main body part 401 and the sealing part 402 are equal, and the inner diameter of the main body part 401 is smaller than that of the sealing part 402; the two ends of the main body part 401 respectively abut against the annular bosses 10 at the two ends, and the inner wall of the sealing part 402 is attached to the surface of one side of the annular boss 10 facing outwards in the radial direction. The sealing part 402 is bonded with the annular boss 10 or/and connected with the annular boss through a bolt 11; one end of the first plug 2 facing the inside of the sleeve 1 is provided with a circle of annular gap 201, and one end of the main body part 401 is abutted to the annular gap 201. After the first plug 2 and the end part of the sleeve 1 are connected in place, the outer end of the first plug 2 along the axial direction is flush with the end part of the sleeve 1, and the outer end of the annular gap 201 along the axial direction is flush with the corresponding annular boss 10; one end surface of the second plug 3 facing the inside of the sleeve 1 is in contact with one end of the main body 401 in the axial direction. The first plug 2 is provided with a liquid outlet channel 8, and the second plug 3 is provided with two circulating channels 9 and a back pressure unblocking channel 21. The mud circulating device is a single-cylinder double-acting piston pump, the second plug 3 is provided with an anti-compression ring 12 towards one end inside the sleeve 1, the anti-compression ring 12 is in interference fit with the diaphragm, the two circulating channels 9 are communicated to the area formed by the anti-compression ring 12 in a surrounding mode, and the two circulating channels 9 are communicated to two output ends of the single-cylinder double-acting piston pump respectively.

In the embodiment, the back pressure unblocking channel 21 is provided with a pressure gauge, and the dynamic circulation pressure of the slurry in the pressure resisting ring 12 can be monitored through the pressure gauge; and the back pressure or the blockage removal can be carried out through the back pressure blockage removal channel 21.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The mud dynamic pollution experiment system is characterized by comprising a core holder (13), a mud container (14) and a mud circulating device connected with the mud container (14), wherein the mud circulating device is used for inputting dynamic mud to one end of the core holder (13), and one end, far away from the mud circulating device, of the core holder (13) is communicated to a liquid metering cup (15).

2. The mud dynamic pollution experiment system as claimed in claim 1, wherein the mud circulation device comprises a single-cylinder double-acting piston pump, the single-cylinder double-acting piston pump comprises a piston cylinder (16), a piston rod (17) matched with the piston cylinder (16) and a piston (18), and two output ends of the single-cylinder double-acting piston pump are both communicated with one end of the core holder (13).

3. The mud dynamic contamination experiment system according to claim 1, wherein a first pressure gauge (19) is arranged in the mud container (14), and a second pressure gauge (20) is arranged on a connecting pipeline between the core holder (13) and the liquid measuring cup (15).

4. The mud dynamic pollution experiment system as claimed in claim 1, wherein the core holder (13) comprises a sleeve (1), a first plug (2) and a second plug (3) which are detachably connected to two ends of the sleeve (1), a diaphragm (4) is arranged in the sleeve (1), the diaphragm (4) is surrounded into a cylindrical structure coaxial with the sleeve (1), the diaphragm (4) is a core holding area (5) surrounding a formed hollow area, a confining pressure area (6) is arranged between the outer wall of the diaphragm (4) and the inner wall of the sleeve (1), and a pressurizing opening (7) communicated with the confining pressure area (6) is arranged on the surface of the sleeve (1).

5. The mud dynamic pollution experiment system according to claim 4, wherein the sleeve (1) is provided with annular bosses (10) at two ends, the annular bosses protrude towards the inner direction of the sleeve (1), and the diaphragm (4) is fixedly connected with one side surface of the annular boss (10) which is radially outward.

6. The mud dynamic pollution experiment system according to claim 5, wherein the diaphragm (4) comprises a cylindrical main body part (401), and sealing parts (402) are arranged at two ends of the main body part (401); the outer diameters of the main body part (401) and the sealing part (402) are equal, and the inner diameter of the main body part (401) is smaller than that of the sealing part (402); the two ends of the main body part (401) are respectively abutted to the annular bosses (10) at the two ends, and the inner wall of the sealing part (402) is attached to the radial outward side surface of the annular boss (10).

7. The mud dynamic pollution experiment system according to claim 6, wherein the sealing part (402) is bonded with the annular boss (10) or/and connected with the annular boss through a bolt (11); one end, facing the interior of the sleeve (1), of the first plug (2) is provided with a circle of annular gap (201), and one end of the main body portion (401) is abutted to the annular gap (201).

8. The mud dynamic pollution experiment system as claimed in claim 7, wherein after the first plug (2) and the end of the sleeve (1) are connected in place, the outer end of the first plug (2) along the axial direction is flush with the end of the sleeve (1), and the outer end of the annular gap (201) along the axial direction is flush with the corresponding annular boss (10); one end face, facing the interior of the sleeve (1), of the second plug (3) is in contact with one end of the main body part (401) along the axial direction.

9. The mud dynamic pollution experiment system as claimed in claim 4, wherein a liquid outlet channel (8) is arranged on the first plug (2), and two circulation channels (9) and a back pressure unblocking channel (21) are arranged on the second plug (3).

10. The dynamic pollution experiment system for the mud according to claim 9, wherein the mud circulation device is a single-cylinder double-acting piston pump, an anti-compression ring (12) is arranged at one end, facing the interior of the sleeve (1), of the second plug (3), the anti-compression ring (12) is in interference fit with the diaphragm, the two circulation channels (9) are communicated to an area formed by the anti-compression ring (12), and the two circulation channels (9) are respectively communicated to two output ends of the single-cylinder double-acting piston pump.