CN107817201B - A kind of parallel core clamper - Google Patents

Abstract

The invention relates to a parallel core holder, which includes a parallel cylinder body, an inner ring gear, a base, and a rubber cylinder. The pieces are respectively placed in the front and rear sealing grooves of the parallel cylinder, the plug is connected with the front end cover and the rear end cover through threads, the rubber tube is placed inside the parallel cylinder, the small end of the square valve core is connected with the fine-tuning nut through threads, and the large end Cooperate with the square valve sleeve, the square valve sleeve is placed in the square through hole in the middle of the parallel cylinder, the parallel cylinder is connected with the large end of the connecting rod and the connecting block by screws, the connecting block is welded on the periphery of the inner ring gear, the inner ring gear and the planetary gear , the central gear cooperate to form a planetary gear mechanism, the central gear, the Y-shaped baffle and the small end of the connecting rod all cooperate with the long end of the rotating rod, the flat key is placed in the keyway at the long end of the rotating rod, and the rotating rod and the long bracket and short end on the base Brackets fit. The invention can efficiently and quickly simulate interlayer and heterogeneous formations and measure relevant parameters.

Description

A Parallel Core Holder

technical field

The invention relates to a physical simulation test device for rock core reservoirs, in particular to a parallel rock core holder.

Background technique

The core holder is a basic component widely used in development tests, mainly for geological exploration of oil and natural gas and related development research. By taking cores from the target formation, the core-related penetration is completed in the core holder. Ratio, porosity and other related tests of formation damage, so as to obtain the physical parameters of the core and fluid, and further reflect the relevant characteristics of the formation. The purpose of the core holder is relatively single, mainly to hold and stabilize the core, control various simulated formation parameters and form a closed space, complete various simulated environment tests and obtain test parameters.

With the continuous development of oil at home and abroad, the conflicts between reservoir layers are becoming more and more prominent, because various lithologies of reservoir strata are intermingled with each other, the influence of heterogeneity and anisotropy is prominent, and the physical properties of each layer are different. big. Using conventional single core clamping to simulate water injection, damage and other related tests of reservoir formations cannot well reflect the flow relationship of the medium between layers, the simulability is poor, and the measurement results have large deviations. The implementation method of the parallel core and heterogeneous core holders that are commonly used now is relatively simple. It is only to superimpose different physical and lithological properties into the holder, and the relevant influencing parameters cannot be adjusted, which is inconvenient to use. For this reason, it is necessary to design a core clamp for interlayer and heterogeneous formations to simulate formation conditions, and to measure formation physical parameters accurately and conveniently by adjusting the flow rate and relative gravity direction, and changing the test lithology.

Contents of the invention

The purpose of the invention is to solve the above problems and propose a high-efficiency and adjustable parallel core holder to realize the work of simulating interlayer and heterogeneous formation environment and measuring related physical parameters.

The purpose of the present invention is achieved through the following technical solutions: a parallel core holder, including a parallel cylinder, an internal gear, a base, and a rubber cylinder, characterized in that: the parallel cylinder, the front end cover, and the rear end cover are all connected by screws connection, the front sealing sheet and the rear sealing sheet are respectively placed in the front and rear sealing grooves of the parallel cylinder body, the plug is connected with the front end cover and the rear end cover through threads, the rubber tube is placed inside the parallel cylinder body, the small end of the square valve core is connected with the The fine-tuning nut is connected by thread, the big end is matched with the square valve sleeve, the square valve sleeve is placed in the square through hole in the middle of the parallel cylinder, the parallel cylinder is connected with the large end of the connecting rod, and the connecting block is connected by screws, and the connecting block is welded to the inner gear ring At the periphery, the inner ring gear cooperates with the planetary gear and the central gear to form a planetary gear mechanism. The central gear, the Y-shaped baffle and the small end of the connecting rod are all matched with the long end of the rotating rod. The flat key is placed in the keyway at the long end of the rotating rod, and the rotating rod Mates with the long and short brackets on the base.

The parallel cylinder is symmetrically provided with two working chambers, the front and rear ends are provided with sealing grooves, the top and bottom are respectively provided with oil inlet holes and oil discharge holes, and the middle part is provided with a square through hole. The two chambers are adjacent to each other. A trapezoidal ledge is arranged on the wall, and a circulation port is opened in the middle of the trapezoidal ledge.

The top of the mating surface of the front end cover, the rear end cover and the parallel cylinder is provided with a wedge-shaped protrusion, the hollow bottom of the middle part of the wedge-shaped protrusion is provided with an internal thread, the middle part of the front end cover is opened with a through hole, and a circle of dials is printed on the periphery of the through hole .

The small end of the fine-tuning nut is provided with an anti-skid groove, and the outer periphery of the large end is evenly distributed with tooth grooves, which cooperate with the dial in the middle of the front end cover.

There is a flow channel in the middle of the plug, the small end is matched with the end of the core sample, and the end face is provided with annular and cylindrical grooves, a plurality of loading and unloading grooves are evenly distributed on the outer side of the large end, and there are grooves on the inner side of the large end adjacent to the cylinder. thread.

The base is provided with a long bracket and a short bracket; both sides of the middle of the long bracket are provided with fixed blocks, the upper part is provided with a counterbore, the top is provided with a positioning hole, and the inner side of the top is provided with a step gap for observation; the planetary gears pass through bolts Attached to the fixed block and counterbore.

The top of the long end of the rotating rod is provided with a thread, and a keyway is provided near the bottom, and a protrusion is provided at the bottom, and the end surface of the protrusion is attached to the outside of the long bracket.

Blind holes are evenly distributed on one side of the upper half of the inner ring gear, and pins pass through the positioning holes to cooperate with the blind holes.

The Y-shaped baffle is placed on the long end of the rotating rod, and the openings in the middle of each top are matched with the planetary gears respectively, and the inner sides are fitted with the ring gear, the planetary gears and the sun gear to ensure that the gears are in the same plane.

The two ends of the rubber tube are designed with wedge-shaped openings matching with the wedge-shaped protrusions, the side door is provided with a square opening, and the surroundings of the square opening are provided with trapezoidal grooves matching with the trapezoidal protrusions.

A square groove is opened at one end of the square valve sleeve, and many flow through holes are arranged in a side array.

One end of the square valve core is provided with a partially threaded cylindrical rod, which can pass through the front sealing plate and the through hole in the middle of the front end cover; the side array of the square valve core has many flow through holes, which are placed at the bottom of the square valve sleeve. The two flow through holes form a one-to-one correspondence.

Beneficial effects of the present invention:

1. The holder can be loaded with two kinds of cores of different lithology, which is used to simulate the working conditions of interlayer and heterogeneous strata. Compared with the single core holder, it can measure the relevant physical parameters of the formation more realistically and accurately.

2. A flow regulating device can be inserted in the middle of the parallel cylinder. The flow regulation is realized by the cooperation of the square valve sleeve and the square valve core. The flow parameters between the two cores can be easily adjusted through the fine-tuning nut, which is very useful for studying the formation characteristics of different situations. Great effect; at the same time, the flow regulating device can be replaced with a targeted artificial core for more complex formation environment simulation.

3. The rubber cartridge with special structure is beneficial to the clamping of the core, and the internal sealing realizes the effective isolation of the displacement medium and the confining pressure control oil.

4. The use of the planetary gear mechanism can realize that the parallel cylinders are at different inclination angles with the rotation of the inner ring gear, and can simulate the working conditions of the fluid medium inside the core when it is in different relative gravity directions during work, so as to obtain different flow laws of the medium; at the same time The mechanism is a deceleration mechanism, which has labor-saving and reliable effects with the cooperation of various supporting structures.

Description of drawings

Fig. 1 is the assembly three-dimensional schematic diagram of parallel rock core holder;

Fig. 2 is a full sectional view of the assembly of the clamping part of the parallel core holder;

Fig. 3 is a three-dimensional exploded schematic diagram of the adjustment part of the parallel core holder;

Fig. 4 is the three-dimensional schematic view of parallel cylinder;

Fig. 5 is a three-dimensional schematic diagram of the front end cover;

Figure 6 is a three-dimensional schematic diagram of the rubber cartridge;

Fig. 7 is a three-dimensional schematic diagram of cooperation of a square valve sleeve, a square valve core and a fine-tuning nut;

In the figure: 1-parallel cylinder; 2-front end cover; 3-plug; 4-fine adjustment nut; 5-rotating rod; 6-internal gear ring; 7-base; 8-connecting rod; 10-rear seal; 11-rubber cartridge; 12-square valve sleeve; 13-square valve core; 14-front seal; 15-loading and unloading groove; 16-short bracket; 17-Y-shaped baffle; ;19-blind hole; 20-long bracket; 21-positioning hole; 22-counterbore; 23-pin; 24-flat key; 25-fixed block; 26-central gear; 29-oil inlet; 30-square through hole; 31-trapezoidal protrusion; 32-oil drain; 33-flow port; 34-wedge protrusion; 35-through hole; 36-wedge opening; 37-trapezoidal groove; 38-square mouth; 39-square groove; 40-cylindrical rod.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

As shown in Figure 1-4, a parallel core holder includes a parallel cylinder body 1, an inner ring gear 6, a base 7, and a rubber cylinder 11, and is characterized in that: the parallel cylinder body 1, the front end cover 2, and the rear end cover 9 are all connected by screws, the front sealing sheet 14 and the rear sealing sheet 10 are respectively placed in the front and rear sealing grooves 28 of the parallel cylinder body 1, the plug 3 is connected with the front end cover 2 and the rear end cover 9 through threads, and the rubber tube 11 is placed Inside the parallel cylinder 1, the small end of the square valve core 13 is threadedly connected with the fine-tuning nut 4, and the large end is matched with the square valve sleeve 12. The square valve sleeve 12 is placed in the square through hole 30 in the middle of the parallel cylinder 1, and the parallel cylinder 1 is connected with the big end of the connecting rod 8 and the connecting block 18 by screws, and the connecting block 18 is welded to the periphery of the inner ring gear 6, and the inner ring gear 6 cooperates with the planetary gear 27 and the central gear 26 to form a planetary gear mechanism. The central gear 26 and the Y-shaped Baffle plate 17 and connecting rod 8 small ends all cooperate with rotating rod 5 long ends, and flat key 24 is placed in rotating rod 5 long end keyways, and rotating rod 5 cooperates with long support 20 and short support 16 on the base 7.

As shown in Fig. 4, two working chambers are arranged symmetrically inside the parallel cylinder body 1, sealing grooves 28 are arranged at both ends of the front and rear ends, an oil inlet hole 29 and an oil discharge hole 32 are respectively arranged at the top and bottom, A square through hole 30 is opened in the middle, and a trapezoidal protrusion 31 is arranged near the wall of the working chamber, and a circulation port 33 is opened in the middle of the trapezoidal protrusion 31 .

As shown in Figure 1 and Figure 5, the top of the mating surface of the front end cover 2, the rear end cover 9 and the parallel cylinder 1 is provided with a wedge-shaped protrusion 34, and the hollow bottom end of the middle part of the wedge-shaped protrusion 34 is provided with an internal thread, and the front end cover 2 The middle part is provided with a through hole 35, and a circle of dials is printed on the periphery of the through hole 35.

As shown in FIG. 1 , the small end of the fine-tuning nut 4 is provided with an anti-slip groove, and the outer periphery of the large end is evenly distributed with tooth grooves, which cooperate with the middle dial on the surface of the front end cover.

As shown in Figure 2, a flow channel is opened in the middle of the plug 3, the small end is matched with the end of the rock core sample, and the end face is provided with annular and cylindrical grooves, and a plurality of loading and unloading grooves 15 are evenly distributed on the outside of the large end. Threads are provided on the inner side of the big end adjacent to the cylinder.

As shown in Figure 3, the base 7 is provided with a long bracket 20 and a short bracket 16; the two sides of the middle of the long bracket 20 are provided with fixed blocks 25, the upper part is provided with a counterbore 22, the top is provided with a positioning hole 21, and the inner side of the top is provided with There is a step clearance available for observation; the planetary gears 27 are all connected with the fixed block 25 and the counterbore 22 by bolts.

As shown in FIG. 3 , the top of the long end of the rotating rod 5 is provided with a screw thread, and a keyway is provided near the bottom.

As shown in FIG. 3 , blind holes 19 are evenly distributed on one side of the upper half of the inner ring gear 6 , and pins 23 pass through the positioning holes 21 to cooperate with the blind holes 19 .

As shown in Figure 3, the Y-shaped baffle plate 17 is placed on the long end of the rotating rod 5, and the openings in the middle of each top are respectively matched with the planetary gear 27, and the inner side is attached to the ring gear 6, the planetary gear 27, and the central gear 26. to ensure that all gears are in the same plane.

As shown in FIG. 6 , both ends of the rubber tube 11 are designed with wedge-shaped openings 36 matching the wedge-shaped protrusions 34 , and a square opening 38 is formed on the side, and trapezoidal grooves 37 matching the trapezoidal protrusions 31 are arranged around the square opening 38 .

As shown in FIG. 7 , a square groove 39 is opened at one end of the square valve sleeve 12 , and many flow through holes are arranged in a side array.

As shown in Figure 7, one end of the square spool 13 is provided with a partially threaded cylindrical rod 40, the cylindrical rod 40 can pass through the front sealing sheet 14 and the through hole 35 in the middle of the front end cover 2; the square spool 13 side array has many The flow through hole, when it is placed at the bottom of the square valve sleeve 12, the two flow through holes form a one-to-one correspondence.

Specific examples:

Assemble the holder into a ready-to-work state, connect the oil inlet pipeline to the upper oil inlet 29 of the parallel cylinder 1, and connect the oil drain pipeline to the oil drain 32 at the lower part of the parallel cylinder 1; insert two kinds of rock cores into the parallel cylinder 1 In the rubber cylinder 11 of the working cavity, a flow control device composed of a square valve sleeve 12 and a square valve core 13 is inserted into the square through hole 30 of the parallel cylinder body 1, and the front end cover 2 and the rear end cover 9 are fixed on the parallel connection through screws. Screw the plug 3 into the front and rear ends of the cylinder 1, tighten the plug 3 through the loading and unloading groove 15 on the plug 3, push the square valve core 13 to the bottom and screw the fine-tuning nut 4 on the cylindrical rod 40 , record the corresponding dial value when the fine-tuning nut 4 is just close to the end face of the front end cover 2, and the front and rear plugs are respectively connected to the displacement medium inlet and outlet pipelines; when starting the test, inject oil from the oil inlet 29, Realize the confining pressure control of the core, the displacement medium is introduced from the inlet pipeline, flows through the cores and flow holes, and finally flows out from the discharge pipeline; when the measurement results show that it is stable, adjust the fine-tuning nut 4 to drive the square valve according to the test situation The core 13 generates relative motion relative to the square valve sleeve 12, thereby realizing the control of the convective flow of the displacement medium; if the flow control device is directly replaced by an artificial square lithology, the front sealing sheet 14 is replaced by a non-porous rear sealing sheet 10; When it is necessary to measure the effect of convective displacement media inside and between the cores in different relative gravity directions, the pin 23 can be pulled out and the rotating rod 5 can be rotated to realize the function of parallel cylinder 1 and the direction of gravity to produce different relative gravity inclination angles , the corresponding situation of the positioning hole 21 and the blind hole 19 can be observed through the step gap opened on the inner side of the top of the long bracket 20. After setting the position, the angle can be fixed by inserting the pin 23. The inclination angle of the parallel cylinder 1 can be within the range of plus or minus 90° horizontally. Rotate; unscrew the plugs 3 at both ends after the test is finished, and eject the rock core with a tool.

Claims (12)

1. a kind of parallel core clamper, including cylinder in parallel (1), ring gear (6), pedestal (7), packing element (11), feature exists In: cylinder (1) in parallel is connected by screw to drive end bearing bracket (2), rear end cap (9), preceding diaphragm seal (14) and rear diaphragm seal (10) It is respectively placed in cylinder in parallel (1) forward and backward seal groove (28), plug (3) and drive end bearing bracket (2) and rear end cap (9) are connected by screw thread It connects, packing element (11) is placed in cylinder in parallel (1) inside, and rectangular spool (13) small end is connected through a screw thread with fine-tuning nut (4), big end Cooperate with rectangular valve pocket (12), rectangular valve pocket (12) is placed in the middle part of cylinder in parallel (1) in square through hole (30), cylinder (1) in parallel Be connected by screw to connecting rod (8) big end, link block (18), link block (18) be welded in ring gear (6) periphery, ring gear (6) with Planetary gear (27), central gear (26) cooperation constitute planetary gear mechanism, central gear (26), Y shape baffle (17) and connecting rod (8) small end cooperates with the long end of rotating bar (5), and flat key (24) is placed in the long end keyway of rotating bar (5), rotating bar (5) and pedestal (7) long stent (20) and short bracket (16) cooperation on.

2. a kind of parallel core clamper according to claim 1, it is characterised in that: the parallel connection cylinder (1) is internal right Title is opened up there are two work chamber, and front and rear ends are provided with seal groove (28), and top and bottom offer fuel feed hole respectively (29) it is offered square through hole (30) with oil leak hole (32), middle part, work chamber closes on wall surface and is provided with trapezoidal convex (31), ladder Communication port (33) are offered in the middle part of shape convex (31).

3. a kind of parallel core clamper according to claim 1, it is characterised in that: the drive end bearing bracket (2), rear end cap (9) wedge-shaped convex (34) is equipped with the top of cylinder in parallel (1) mating surface, hollow bottom end offers interior in the middle part of wedge-shaped convex (34) Screw thread, drive end bearing bracket (2) middle part offer through-hole (35), and through-hole (35) periphery is printed on a circle dial.

4. a kind of parallel core clamper according to claim 1, it is characterised in that: fine-tuning nut (4) small end is set It is equipped with non-slip groove, big end periphery is evenly equipped with tooth socket, cooperates with drive end bearing bracket surface middle part dial.

5. a kind of parallel core clamper according to claim 1, it is characterised in that: offered in the middle part of the plug (3) Runner, small end and core sample end cooperate, and end face offers annular and cylindrical groove, is evenly equipped with multiple handling on the outside of big end Slot (15), big end inside, which is closed on, offers screw thread on cylinder.

6. a kind of parallel core clamper according to claim 1, it is characterised in that: be provided with length on the pedestal (7) Bracket (20) and short bracket (16)；Long stent (20) on both sides of the middle is equipped with fixed block (25), and top is equipped with counterbore (22), and top is opened Equipped with location hole (21), the step clearance that top inner side offers for observation；Planetary gear (27) passes through bolt and fixation Block (25) is connected with counterbore (22).

7. a kind of parallel core clamper according to claim 1, it is characterised in that: at the top of the long end of rotating bar (5) Screw thread is offered, offers keyway close to bottom, bottom is equipped with convex, is bonded on the outside of convex end face and long stent (20).

8. a kind of parallel core clamper according to claim 1, it is characterised in that: half-turn one on the ring gear (6) Side end is evenly equipped with blind hole (19), and pin (23) passes through location hole (21) and blind hole (19) and cooperates.

9. a kind of parallel core clamper according to claim 1, it is characterised in that: the Y shape baffle (17), which is placed in, to be turned On the long end of lever (5), each top middle portion aperture of Y shape baffle (17) cooperates with each planetary gear (27) mesoporous respectively, Y shape baffle (17) inside is bonded with ring gear (6), planetary gear (27), central gear (26), guarantees each gear in the same plane.

10. a kind of parallel core clamper according to claim 1, it is characterised in that: packing element (11) both ends are equipped with With the wedge-like opening (36) of wedge-shaped convex (34) cooperation, side is offered square orifice (38), and square orifice (38) is surrounded by and ladder The dovetail groove (37) of shape convex (31) cooperation.

11. a kind of parallel core clamper according to claim 1, it is characterised in that: described rectangular valve pocket (12) one end It is provided with square groove (39), there are many flow through-holes for lateral array.

12. a kind of parallel core clamper according to claim 1, it is characterised in that: described rectangular spool (13) one end It is provided with the cylindrical bar (40) of band part screw thread, cylindrical bar (40) passes through preceding diaphragm seal (14) and drive end bearing bracket (2) middle through-hole (35)；There are many flow through-holes for rectangular spool (13) lateral array, and flow leads to both when being placed in rectangular valve pocket (12) bottommost Hole, which is formed, to be corresponded.