CN210982161U - Core holder for slurry dynamic pollution experiment - Google Patents

Abstract

The utility model discloses a rock core holder for mud dynamic pollution experiment, include the sleeve, can dismantle first end cap, the second end cap of connection at the sleeve both ends, set up the diaphragm in the sleeve, the diaphragm encloses into the tubular structure coaxial with the sleeve, and the diaphragm is the rock core clamping area around the cavity region that forms, for confining pressure district between diaphragm outer wall and the sleeve inner wall, sleeve surface set up with the pressure port of confining pressure district intercommunication. An object of the utility model is to provide a rock core holder for mud dynamic pollution experiment to there is the great, limited problem of accuracy in the simulation of solving among the prior art mud dynamic pollution experiment, realizes providing dedicated rock core holder for mud dynamic pollution experiment, improves the purpose of the accuracy of objective parameter in the simulation experiment process.

Description

Core holder for slurry dynamic pollution experiment

Technical Field

The utility model relates to an oil gas field stratum evaluation field, concretely relates to rock core holder for mud dynamic pollution experiment.

Background

The core holder is an appliance used for holding and protecting a rock sample and sealing a cylindrical surface or an end surface (generally an end surface with a reserved fluid inlet and outlet) when the seepage characteristics of the rock sample are measured in a laboratory or a displacement test is carried out, and is an indispensable important auxiliary component in the development of experimental instrument devices. According to the conventional rock core holder, confining pressure is simulated through a rigid shell, and stratum confining pressure can be simulated for conventional measurement of physical parameters such as rock core permeability and porosity, so that the requirement is met. However, 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 wellbore 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. Comprehensively, the difficulty of the research on the mechanism of the full-diameter core slurry pollution injury in the prior art is that the size of a core holder is large, and the simulation difficulty of sealing and slurry dynamic circulation is large, so that the simulation accuracy is limited.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rock core holder for mud dynamic pollution experiment to there is the great, limited problem of accuracy in the simulation of solving among the prior art mud dynamic pollution experiment, realizes providing dedicated rock core holder for mud dynamic pollution experiment, improves the purpose of the accuracy of objective parameter in the simulation experiment process.

The utility model discloses a following technical scheme realizes:

a rock core holder for mud dynamic pollution experiment, including the sleeve, can dismantle first end cap, the second end cap of connection at sleeve both ends, set up the diaphragm in the sleeve, the diaphragm encloses into the tubular structure coaxial with the sleeve, and the diaphragm is the rock core clamping area around the hollow region who forms, is confining pressure district between diaphragm outer wall and the sleeve inner wall, sleeve surface set up with the pressure port of confining pressure district intercommunication.

Great, the limited problem of accuracy of simulation existence error to among the prior art mud dynamic pollution experiment, the utility model provides a rock core holder for mud dynamic pollution experiment, first end cap, second end cap are connected respectively to the sleeve both ends, and the preferred connection of dismantling through the screw thread is convenient for pack into fast and take out the rock core and experiment. 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. For this reason, this application sets up the diaphragm in the sleeve, and the diaphragm encloses into the tubular structure coaxial with the sleeve, is the confined pressure district between diaphragm outer wall and the sleeve inner wall. This application 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 pressurization mouth 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 application 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 diaphragm in this application surrounds the inner diameter of the cylindrical structure formed, corresponding to 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, the diaphragm is fixed on 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.

Furthermore, the diaphragm is fixedly connected with the surface of one side, which is radially outward, of the annular boss. The diaphragm is connected at the radial lateral surface outwards of annular boss promptly to make confined pressure district pressurization back, the confined pressure can be with the inseparable pressure of diaphragm on the annular boss at both ends, realize the self-sealing effect 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. 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.

Furthermore, one end, facing the inside of the sleeve, of the first plug is provided with a circle of annular gap, and one end of the main body part is abutted to the inside of the annular gap. 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. 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.

Furthermore, 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. 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 are arranged on the second plug. According to the scheme, one end where the second plug is located is used as a first end close to the shaft, and one end where the first plug is located is used as an end far away from the shaft; in order to match with a mud dynamic pollution experiment, two circulating channels are arranged on the second plug, so that the drilling fluid can be conveniently circulated to simulate a dynamic pollution process. The first plug is provided with a liquid outlet channel which is convenient for containing and measuring the filtered drilling fluid.

Further, the second end cap sets up the anti-compression ring towards the inside one end of sleeve, anti-compression ring and diaphragm interference fit, two circulation channel all communicate to the anti-compression ring around in the region that forms. Two circulation passage all communicate to the resistance to compression ring around the regional in that forms, therefore the dynamic simulation of mud is accomplished in resistance to compression ring is inside, in order to avoid artifical confined pressure of exerting in this application to disturb the mud flow state, influence mud dynamic simulation process, this scheme sets up the resistance to compression ring, resistance to compression ring and diaphragm interference fit to keep apart with the diaphragm through the mud of resistance to compression ring in with the experimentation, avoid confined pressure to act on dynamic mud. Preferably, this scheme is when using, and the one end of putting into the rock core is supported and is held up on the compression ring terminal surface, can improve the stability of rock core in the experimentation through the compression ring.

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

1. the utility model discloses a rock core holder for mud dynamic pollution experiment packs the rock core into in the sleeve and makes the rock core be located inside the diaphragm, pressurizes to the confined pressure district internal pressure 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 rock core surface, thereby realizes the purpose of more accurate simulation reservoir actual conditions, makes the accuracy of mud dynamic pollution experiment greatly improve.

2. The utility model discloses a rock core holder for mud dynamic pollution experiment, confined pressure district pressurization back, 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, the problem of the sealed difficulty of rock core holder in the full diameter rock core mud dynamic pollution experimentation.

3. The utility model is used for the rock core holder of mud dynamic pollution experiment, the annular boss that holds together both ends respectively at the both ends of the main part of diaphragm is ensured sealedly, and the sealing pastes at the radial outside lateral surface of annular boss to make fully wrap up between the tip of diaphragm and annular boss, no matter be the terminal surface of annular boss, still its lateral surface, all can fully contact with the diaphragm, thereby eliminate the gap, further improve the sealing performance of this application.

4. The utility model is used for the rock core holder of mud dynamic pollution experiment, for the confined pressure that avoids artifical the application disturb the mud flow state, influence mud dynamic simulation process, specially set up the compression ring, compression ring and diaphragm interference fit to keep apart with the diaphragm through the mud of compression ring in with the experimentation, avoid the confined pressure to act on dynamic mud.

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 cross-sectional view of an embodiment of the present invention;

fig. 2 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 gap, 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 and 12-compression-resistant ring.

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 core holder for the mud dynamic pollution experiment as shown in fig. 1 and 2 comprises a sleeve 1, a first plug 2 and a second plug 3 which are detachably connected to two ends of the sleeve 1, wherein a diaphragm 4 is arranged in the sleeve 1, the diaphragm 4 surrounds a cylindrical structure coaxial with the sleeve 1, a hollow area formed by the diaphragm 4 in a surrounding mode is a core holding area 5, 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.

In this embodiment, the diaphragm 4 is made of an elastic silica gel sheet, and the pressure gauge for monitoring the pressure in the pressure surrounding area 6 is arranged on the pressure port 7, and the pressure port can be closed.

Example 2:

as shown in fig. 1 and 2, in the core holder for the dynamic slurry contamination experiment, on the basis of embodiment 1, annular bosses 10 protruding toward the inner direction of the sleeve 1 are respectively disposed at two ends of the sleeve 1, and the membrane 4 is fixed on the annular bosses 10. The diaphragm 4 is fixedly connected with one side surface of the annular boss 10 which is radially outward. 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 to the annular boss 10 or/and connected by bolts 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 end part of the sleeve 1 is connected with the first plug 2 in place, the outer end of the first plug 2 in the axis direction is flush with the end part of the sleeve 1, and the outer end of the annular gap 201 in the axis 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.

Preferably, the first plug 2 is provided with a liquid outlet channel 8, and the second plug 3 is provided with two circulation channels 9. One end of the second plug 3 facing the interior of the sleeve 1 is provided with an anti-compression ring 12, the anti-compression ring 12 is in interference fit with the diaphragm, and the two circulation channels 9 are communicated to the area formed by the anti-compression ring 12 in a surrounding mode.

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 (10)

1. A rock core holder for mud dynamic pollution experiment, including sleeve (1), can dismantle first end cap (2), second end cap (3) of connection at sleeve (1) both ends, its characterized in that, set up diaphragm (4) in sleeve (1), diaphragm (4) enclose into the tubular structure coaxial with sleeve (1), and diaphragm (4) are rock core clamping area (5) around the hollow region who forms, are confined pressure district (6) between diaphragm (4) outer wall and sleeve (1) inner wall, sleeve (1) surface set up with pressure port (7) of confined pressure district (6) intercommunication.

2. The core holder for the mud dynamic pollution experiment is characterized in that two ends of the sleeve (1) are respectively provided with an annular boss (10) protruding towards the inner direction of the sleeve (1), and the diaphragm (4) is fixed on the annular bosses (10).

3. The core holder for the mud dynamic pollution experiment is characterized in that the diaphragm (4) is fixedly connected with one side surface of the annular boss (10) which is outward in the radial direction.

4. The core holder for the mud dynamic pollution experiment is characterized in that 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).

5. The core holder for the mud dynamic pollution experiment is characterized in that the sealing part (402) is bonded with the annular boss (10) or/and connected with the annular boss through a bolt (11).

6. The core holder for the mud dynamic pollution experiment is characterized in that one end, facing the interior of the sleeve (1), of the first plug (2) is provided with a ring of annular gaps (201), and one end of the main body part (401) is abutted in the annular gaps (201).

7. The core holder for the mud dynamic pollution experiment is characterized in that after the first plug (2) and the end of the sleeve (1) are connected in place, the outer end of the first plug (2) in the axial direction is flush with the end of the sleeve (1), and the outer end of the annular gap (201) in the axial direction is flush with the corresponding annular boss (10).

8. The core holder for the mud dynamic pollution experiment is characterized in that 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) in the axial direction.

9. The core holder for the mud dynamic pollution experiment according to any one of claims 1 to 8, characterized in that a liquid outlet channel (8) is arranged on the first plug (2), and two circulation channels (9) are arranged on the second plug (3).

10. The core holder for the mud dynamic pollution experiment is characterized in that 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, and the two circulation channels (9) are communicated to an area formed by the anti-compression ring (12).

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