CN107165606B - High-pressure negative-pressure separate mining device on upper layer - Google Patents
High-pressure negative-pressure separate mining device on upper layer Download PDFInfo
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- CN107165606B CN107165606B CN201710496970.9A CN201710496970A CN107165606B CN 107165606 B CN107165606 B CN 107165606B CN 201710496970 A CN201710496970 A CN 201710496970A CN 107165606 B CN107165606 B CN 107165606B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
Abstract
The invention discloses an upper-layer high-pressure negative pressure separate mining device, which comprises a main body, wherein a first eccentric through hole and a second eccentric through hole which are formed in the top surface of the main body are communicated with a central through hole formed in the bottom surface of the main body; the valve seat and the ball valve are respectively arranged at the top end part of the first eccentric through hole and the communication part of the first eccentric through hole and the central through hole, and a communication hole arranged between the first eccentric through hole and the second eccentric through hole is arranged above the ball valve; the throat pipe is inserted at the bottom of the second eccentric through hole, the inner diameter of the bottom end of the throat pipe is increased, and a spray head is arranged, so that a central pore canal of the throat pipe, the second eccentric through hole and the central pore canal of the spray head are sequentially arranged; the press cap is arranged on the inner wall of the lower side of the main body, a third eccentric through hole and a fourth eccentric through hole are formed in the top surface of the self-press cap, and the fourth eccentric through hole is communicated with an overflow hole formed in the side wall of the lower side of the main body; the upper-layer high-pressure negative-pressure separate mining device improves the fluid passing capacity of a low-pressure area to the maximum extent, increases the application range of pressure difference between tool layers, and greatly improves the recovery ratio.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to an upper-layer high-pressure negative pressure separate mining device.
Background
With the lapse of oil field development time, most oil wells enter a high extraction stage, the difficulty of improving the recovery ratio is increased year by year, and the difficulty of measures is increased continuously. In recent oilfield development processes, single-layer mining or multi-layer combined mining is mainly used. After multi-layer production, the production of some oil wells does not increase unexpectedly, and even the extreme case of negative increase of the production occurs. The interlayer pressure difference between the original exploitation layer and the newly-jetted exploitation layer is as high as more than 5MPa, the interlayer contradiction is very prominent, the phenomenon that the high-pressure layer flows backward to the low-pressure layer after multi-layer exploitation is caused, the exploitation effect is seriously influenced, and the technology research capable of effectively solving the problem at home and abroad is less.
The existing method for solving the technology is that in a production well, a releasing device, a packer and a layered oil extractor are used in a matched mode, after the packer seals a stratum, a jet pump-like principle is adopted, a high-pressure liquid layer forms a negative pressure area through an internal jet device of the layered oil extractor during oil extraction, the low-pressure layer is induced and sucked, and meanwhile, a double single-flow valve is arranged to prevent high-pressure fluid from flowing backward to the low-pressure area. However, the existing equipment has the problems of complex structure, small negative pressure generation, small size of a fluid channel in a low-pressure area, small interlayer pressure difference adaptation (within 1MPa at most), and limited application range, can block a low-pressure layer under the condition of large interlayer pressure difference, cannot meet the existing requirements, and cannot be widely applied to oil fields. Therefore, a novel negative pressure separate mining device is needed, which can enlarge the fluid channel of the low pressure area, improve the range of the pressure difference between the layers, and meet the separate mining requirements.
Disclosure of Invention
The invention aims to provide an upper-layer high-pressure negative-pressure separate mining device which can make up the defects of small negative pressure range, small fluid channel in a low-pressure area, limited application range and the like of the traditional device.
For this purpose, the technical scheme of the invention is as follows:
an upper-layer high-pressure negative pressure separate mining device comprises a main body, a throat pipe, a spray head, a pressure cap, a ball valve and a valve seat, wherein the throat pipe, the spray head, the pressure cap, the ball valve and the valve seat are arranged in the main body; wherein, the liquid crystal display device comprises a liquid crystal display device,
a first eccentric through hole and a second eccentric through hole are respectively formed in the top surface of the main body along the axial direction, and a central through hole is formed in the bottom surface of the main body; the first eccentric through hole and the second eccentric through hole are communicated with the central through hole respectively; the side wall of the lower side of the main body is provided with an overflow hole;
the valve seat is arranged and blocked at the top end part of the first eccentric through hole; the ball valve is arranged and plugged at the communication position of the first eccentric through hole and the central through hole; a communication hole is formed between the first eccentric through hole and the second eccentric through hole along the radial direction, and the communication hole is formed adjacent to the ball valve and is positioned above the ball valve; the valve seat and the ball valve arranged in the first eccentric through hole form a single-flow control valve of the device, so that the liquid in the high-pressure layer cannot flow back into the low-pressure layer;
the top end of the throat pipe is inserted and fixed at the bottom of the second eccentric through hole, so that a small-size pore canal formed in the center of the throat pipe is communicated with the second eccentric through hole; the inner diameter of the bottom end of the throat pipe is increased, and the top end of the nozzle is sleeved on the inner side of the bottom end of the throat pipe, so that a small-size pore canal of the throat pipe is communicated with a large-size pore canal formed in the center of the nozzle;
the press cap is sleeved and fixed on the inner wall of the lower side of the main body; a third eccentric through hole and a fourth eccentric through hole are respectively formed in the top surface of the press cap, the third eccentric through hole is formed in the axial direction, and the fourth eccentric through hole is a right-angle through hole communicated with the overflow hole; the third eccentric through hole and the fourth eccentric through hole are respectively in one-to-one correspondence with the first eccentric through hole and the second eccentric through hole, so that the bottom end of the spray head is sleeved on the inner side of the top end of the fourth eccentric through hole, and a large-size pore canal of the spray head is communicated with the fourth eccentric through hole.
Further, the upper-layer high-pressure negative pressure sub-extraction device also comprises an upper joint, a connecting cylinder and a lower joint; the upper joint, the main body, the connecting cylinder and the lower joint are sequentially connected in a threaded mode. Wherein the connecting cylinder is used for prolonging the flow path of the low-pressure liquid in the device.
Further, the inner wall of the communication part of the second eccentric through hole and the venturi is gradually shrunk and processed into a cone shape, and the inner diameter of the end part of the bottom end of the cone shape is consistent with the inner diameter of the small-size pore canal of the venturi, so that the high-pressure fluid is prevented from turbulent flow when entering the small-size pore canal of the venturi from the second eccentric through hole.
Further, the inner wall of the upper side of the large-size pore canal arranged in the center of the spray head is gradually contracted into a cone shape from bottom to top, and the inner diameter of the end part of the conical top end is consistent with the inner diameter of the small-size pore canal of the throat, so that turbulent flow is prevented from being generated when the rapid fluid in the small-size pore canal of the throat enters the large-size pore canal of the spray head.
Further, a seal is formed between the valve seat and the inner wall of the first eccentric through hole; the inner wall at the bottom end of the second eccentric through hole and the outer wall at the top end of the throat pipe form a seal; the inner wall of the bottom end of the throat pipe and the outer wall of the top end of the nozzle form a seal; the outer wall of the bottom end of the nozzle and the inner wall of the fourth eccentric through hole form a seal; and the top end outer wall and the bottom end outer wall of the press cap are respectively sealed with the inner wall of the main body.
Further, the upper joint is in sealing connection with the body; the lower connector is in sealing connection with the connecting cylinder.
The upper-layer high-pressure negative-pressure separate mining device solves the interlayer contradiction which always puzzles the petroleum exploitation, avoids the backflow of a high-pressure layer to a low-pressure layer caused by the pressure difference between layers in multi-layer exploitation, and realizes multi-layer common exploitation. Compared with the prior art, the device has the advantages that the structure is simple and reasonable, the single check valve is adopted, the fluid passing capacity of a low-pressure area is improved to the maximum extent, the application range of pressure difference between tool layers is enlarged, the requirements of most oil well exploitation are met, the recovery ratio is greatly improved, and the device has higher application value and wide popularization prospect.
Drawings
FIG. 1 is a schematic structural view of an upper-layer high-pressure negative pressure separate mining device of the present invention;
FIG. 2 is a schematic structural view of a main body of an upper-layer high-pressure negative pressure separate mining device of the present invention;
fig. 3 is a schematic structural view of a press cap of the upper-layer high-pressure negative-pressure separate mining device.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and specific examples, which are in no way limiting.
As shown in fig. 1, the upper-layer high-pressure negative pressure separate mining device comprises an upper joint 1, a main body 2, a connecting cylinder 9 and a lower joint 6 which are sequentially connected in a threaded manner from top to bottom; the inner side of the main body 2 is provided with a throat pipe 3, a spray head 4, a press cap 5, a ball valve 7 and a valve seat 8.
As shown in fig. 2, the main body 2 has a cylindrical structure, and a first eccentric through hole 201 and a second eccentric through hole 202 are respectively formed on the top surface of the main body 2 along the axial direction, and a central through hole 203 is formed on the bottom surface of the main body 2; the first eccentric through hole 201 and the second eccentric through hole 202 are respectively in communication with the central through hole 203; an overflow hole 10 is also arranged on the side wall of the lower side of the main body 2.
The valve seat 8 is arranged on the inner side of the top end part of the first eccentric through hole 201 and is fixedly connected with the inner wall of the first eccentric through hole 201 through threads; specifically, the valve seat 8 has a cylindrical structure, the outer diameter of the valve seat 8 is matched with the inner diameter of the first eccentric through hole 201, the top end of the valve seat 8 is provided with an annular flange, the inner wall of the top end of the first eccentric through hole 201 is inwards recessed to form a first annular step matched with the annular flange at the top end of the valve seat 8, so that the valve seat 8 is inserted in the first eccentric through hole 201, and the annular flange is press-fit on the first annular step of the inner wall of the first eccentric through hole 201; in addition, the valve seat 8 is completely blocked at the top end of the first eccentric through hole 201 by a double seal ring arranged between the outer wall of the annular flange of the valve seat 8 and the inner wall of the first eccentric through hole 201.
The ball valve 7 is a circular sphere and is arranged at the bottom of the first eccentric through hole 201; specifically, the bottom end of the first eccentric through hole 201 (i.e. the communication position with the central through hole 203) is processed into a circular concave surface which is matched with the shape of the ball valve 7, so that the ball valve 7 is pressed on the circular concave surface, and a communication channel between the first eccentric through hole 201 and the central through hole 203 is blocked; a communication hole 204 is formed between the first eccentric through hole 201 and the second eccentric through hole 202 along the radial direction, and the communication hole 204 is formed adjacent to the ball valve 7 and is positioned above the ball valve 7, so that the ball valve 7 is pushed to move upwards under the action of pressure difference, and a communication channel between the central through hole 203 and the second eccentric through hole 202 is opened, thereby realizing pressure stabilization.
The throat pipe 3 is of a cylindrical structure, the outer diameter of the upper part of the throat pipe is smaller than that of the lower part of the throat pipe, and a small-size pore canal is formed downwards along the axial direction from the center of the top end of the throat pipe 3; the inner wall of the bottom end of the second eccentric through hole 202 protrudes inwards to enable the top end of the throat pipe 3 to be inserted into the bottom end of the second eccentric through hole 202, so that the second eccentric through hole 202 is communicated with a small-size pore canal of the throat pipe 3, and in order to prevent turbulent flow, the inner wall of the communicating part of the second eccentric through hole 202 and the throat pipe 3 is gradually contracted and processed into a cone shape, and the inner diameter of the end part of the cone-shaped bottom end is consistent with the inner diameter of the small-size pore canal of the throat pipe 3; also, in order to ensure the tightness, a seal is formed between the outer wall of the top end of the throat pipe 3 and the inner wall of the bottom end of the second eccentric through hole 202 by the two sealing rings.
The inner diameter of the inner wall at the bottom end of the throat pipe 3 is increased, so that the top end of the spray head 4 is sleeved on the inner side of the bottom end of the throat pipe 3 and is fixedly connected with threads, and the second eccentric through hole 202, the small-size pore canal of the throat pipe 3 and the large-size pore canal of the spray head 4 are communicated; the method comprises the steps of carrying out a first treatment on the surface of the Specifically, a large-size pore canal is formed in the center of the spray head 4, the inner wall of the upper side of the large-size pore canal gradually contracts into a cone shape from bottom to top, and the inner diameter of the end part of the conical top end is consistent with the inner diameter of the small-size pore canal of the throat pipe 3, so that turbulence is prevented from occurring; also, in order to ensure tightness, two sealing rings are arranged between the inner wall of the bottom end of the throat pipe 3 and the outer wall of the top end of the nozzle 4 to form sealing.
The pressing cap 5 is sleeved and fixed on the inner wall of the lower side of the main body 2; specifically, the inner wall of the lower side of the main body 2 is inwards recessed to form a second annular step, so that the cylindrical press cap 5 is sleeved on the inner side of the main body 2, the top end of the cylindrical press cap is propped against the lower end face of the second annular step, and the bottom end of the cylindrical press cap is press-fitted on the top face of the connecting cylinder 9; as shown in fig. 3, a third eccentric through hole 501 and a fourth eccentric through hole 502 are respectively formed on the top surface of the self-pressing cap 5; the third eccentric through hole 501 is a through hole which is opened along the axial direction, and the central axes of the first eccentric through hole 201 and the third eccentric through hole 501 are coincident, so that the central through hole 203 is communicated with the connecting cylinder 9; the fourth eccentric through hole 502 is a right-angle through hole communicated with the overflow hole 10, namely, the fourth eccentric through hole 502 is formed by an axial hole formed downwards along the axial direction from the top surface of the pressure cap 5 and a radial hole formed on the side wall of the pressure cap 5 adjacent to the overflow hole 10; the central axes of the second eccentric through hole 202 and the fourth eccentric through hole 502 coincide, and an annular step is arranged on the inner wall of the fourth eccentric through hole 502, so that the bottom end of the nozzle 4 is inserted into the inner side of the top end of the fourth eccentric through hole 502, the bottom end of the nozzle 4 is pressed on the upper end face of the annular step on the inner wall of the fourth eccentric through hole 502, and a large-size pore canal of the nozzle 4, the fourth eccentric through hole 502 and the overflow hole 10 are communicated; likewise, in order to ensure tightness, the outer wall of the top end and the outer wall of the bottom end of the press cap 5 are respectively sealed with the inner wall of the main body 2 by two sealing rings; and two sealing rings are arranged between the outer wall of the bottom end of the nozzle 4 and the inner wall of the fourth eccentric through hole 502 of the press cap 5 to form a seal.
In addition, a seal is formed between the upper joint 1 and the body 2, and between the lower joint 6 and the connecting cylinder 9 by the two sealing rings.
Wherein, the inner diameter of the second eccentric through hole 202 is larger than the inner diameter of the large inner diameter pore canal of the nozzle 4 and larger than the inner diameter of the small inner diameter pore canal of the throat 3, and the inner diameters of the second eccentric through hole 202 and the large inner diameter pore canal of the nozzle 4 are both far larger than the inner diameter of the small inner diameter pore canal of the throat 3, so that the liquid entering the small inner diameter pore canal of the throat 3 from the second eccentric through hole 202 forms a rapid flow, the flow speed and the hydraulic pressure are rapidly increased, and the liquid coming out of the small inner diameter pore canal of the throat 3 and then entering the large inner diameter pore canal of the nozzle 4 is instantly released to be lower than the hydraulic pressure of the lower-layer low-pressure liquid though the flow speed is unchanged, and the low-pressure liquid flows out through the flow hole 10 and is converged with the lower-layer low-pressure liquid.
When the device is used, the upper-layer high-pressure negative pressure separate mining device is arranged at the tail end of the pipe column, and the upper part of the device is connected with the liquid discharge pump and is lowered to the middle position of two strata.
The working principle of the upper-layer high-pressure negative pressure separate mining device is as follows:
when the pressure difference between the layers exists between the upper stratum fluid and the lower stratum fluid, and the upper layer is a high-pressure area, and the lower layer is a low-pressure area, the upper layer high-pressure negative pressure separate mining device is lowered to the middle position of the high-pressure layer and the low-pressure layer; at this time, the high-pressure liquid at the upper layer enters the device through the fourth eccentric through hole 502, sequentially flows through the large inner diameter hole channel of the nozzle 4, the small inner diameter hole channel of the throat 3, the second eccentric through hole 202 and the top end of the main body 2, and is discharged from the upper joint 1, wherein when the high-pressure liquid at the upper layer enters the small inner diameter hole channel of the throat 3, the high-pressure liquid forms a rapid flow in the small inner diameter hole channel of the throat 3 due to the fact that the inner diameter of the small inner diameter hole channel is far smaller than the inner diameter of the second eccentric through hole 202, and the flow speed and the hydraulic pressure of the high-pressure liquid are both greater than those of the high-pressure liquid at the upper layer; the large inner diameter pore canal of the nozzle 4 is far larger than the small inner diameter pore canal of the throat pipe 3, so that the pressure of the rapid flow in the throat pipe 3 is released, the flow rate of the liquid entering the large inner diameter pore canal of the main body 2 is instantly reduced in pressure and is lower than the low-pressure liquid at the lower layer, and a negative pressure area is formed; the ball valve 7 moves upwards under the action of negative pressure, a fluid channel in a low-pressure area formed among the third through hole 203, the first eccentric through hole 201, the communication hole 204 and the second eccentric through hole 202 is opened, suction is formed on a low-pressure layer, lower-layer low-pressure liquid enters the device from the lower joint 6 and sequentially flows through the connecting cylinder 9, the third eccentric through hole 501, the central through hole 203, the first eccentric through hole 201 and the communication hole 204, and finally is converged with high-pressure fluid in the second eccentric through hole 202, so that the upper-layer high-pressure liquid and the lower-layer low-pressure liquid form stable circulation in the device, and the phenomenon that the high-pressure layer flows backward to the low-pressure layer due to pressure difference between the upper layer and the lower layer is avoided, and the lower-layer low-pressure liquid is discharged from the upper joint 1 is avoided.
The valve seat ball valve arranged in the first eccentric through hole forms a uniflow control valve of the device, so that a fluid channel in a low-pressure area can be effectively plugged, high-pressure layer liquid can not flow into a low-pressure layer, and double-layer common exploitation of an upper high-pressure layer and a lower low-pressure layer is realized. Meanwhile, the structural design of the device enables the inside of the device to generate negative pressure of more than 5Mpa so as to adapt to interlayer pressure difference of 0-5 Mpa.
In summary, the upper-layer high-pressure negative-pressure separate mining device solves the problem of common mining of two layers with unbalanced upper and lower layers in an oil well, realizes simultaneous mining of more than two layers, fully utilizes the energy of a high-layer region and improves the recovery ratio.
Claims (6)
1. The upper-layer high-pressure negative pressure separate mining device is characterized by comprising a main body (2), a throat (3), a spray head (4), a pressure cap (5), a ball valve (7) and a valve seat (8), wherein the throat (3), the spray head (4), the pressure cap (5) and the ball valve (7) are arranged in the main body (2); wherein, the liquid crystal display device comprises a liquid crystal display device,
a first eccentric through hole (201) and a second eccentric through hole (202) are respectively formed in the axial direction from the top surface of the main body (2), and a central through hole (203) is formed in the bottom surface of the main body (2); the first eccentric through hole (201) and the second eccentric through hole (202) are respectively communicated with the central through hole (203); an overflow hole (10) is formed in the side wall of the lower side of the main body (2);
the valve seat (8) is arranged and blocked at the top end part of the first eccentric through hole (201); the ball valve (7) is arranged and blocked at the communication part of the first eccentric through hole (201) and the central through hole (203); a communication hole (204) is formed between the first eccentric through hole (201) and the second eccentric through hole (202) along the radial direction, and the communication hole (204) is formed adjacent to the ball valve (7) and is positioned above the ball valve (7);
the top end of the throat pipe (3) is inserted and fixed at the bottom of the second eccentric through hole (202), so that a small-size pore canal formed in the center of the throat pipe (3) is communicated with the second eccentric through hole (202); the inner diameter of the bottom end of the throat pipe (3) is increased, and the top end of the nozzle (4) is sleeved on the inner side of the bottom end of the throat pipe (3), so that a small-size pore canal of the throat pipe (3) is communicated with a large-size pore canal formed in the center of the nozzle (4);
the pressing cap (5) is sleeved and fixed on the inner wall of the lower side of the main body (2); a third eccentric through hole (501) and a fourth eccentric through hole (502) are respectively formed in the top surface of the press cap (5), the third eccentric through hole (501) is formed in the axial direction, and the fourth eccentric through hole (502) is a right-angle through hole communicated with the overflow hole (10); the third eccentric through hole (501) and the fourth eccentric through hole (502) are respectively in one-to-one correspondence with the first eccentric through hole (201) and the second eccentric through hole (202), so that the bottom end of the spray head (4) is sleeved on the inner side of the top end of the fourth eccentric through hole (502), and a large-size pore channel of the spray head (4) is communicated with the fourth eccentric through hole (502).
2. The upper-layer high-pressure negative-pressure separate mining device according to claim 1, further comprising an upper joint (1), a connecting cylinder (9) and a lower joint (6); the upper joint (1), the main body (2), the connecting cylinder (9) and the lower joint (6) are sequentially connected in a threaded mode.
3. The upper-layer high-pressure negative-pressure separate mining device according to claim 1, characterized in that the inner wall of the communication part of the second eccentric through hole (202) and the throat pipe (3) is gradually shrunk and processed into a cone shape, and the inner diameter of the end part of the cone bottom end is consistent with the inner diameter of a small-size pore canal of the throat pipe (3).
4. The upper-layer high-pressure negative-pressure separate mining device according to claim 1, wherein the inner wall of the upper side of the large-size pore canal arranged in the center of the spray head (4) gradually contracts into a cone shape from bottom to top, and the inner diameter of the end part of the conical top end is consistent with the inner diameter of the small-size pore canal of the throat pipe (3).
5. The upper-layer high-pressure negative-pressure sub-extraction device according to claim 1, characterized in that a seal is formed between the valve seat (8) and the inner wall of the first eccentric through hole (201); the inner wall of the bottom end of the second eccentric through hole (202) and the outer wall of the top end of the throat pipe (3) form a seal; the inner wall of the bottom end of the throat pipe (3) and the outer wall of the top end of the nozzle (4) form a seal; the outer wall of the bottom end of the spray head (4) and the inner wall of the fourth eccentric through hole (502) form a seal; the top end outer wall and the bottom end outer wall of the press cap (5) are respectively sealed with the inner wall of the main body (2).
6. The upper-layer high-pressure negative-pressure separate mining device according to claim 2, characterized in that the upper joint (1) is in sealing connection with the main body (2); the lower joint (6) is in sealing connection with the connecting cylinder (9).
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| CN201710496970.9A CN107165606B (en) | 2017-06-26 | 2017-06-26 | High-pressure negative-pressure separate mining device on upper layer |
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