CN212837728U - Layered water finding and production integrated tubular column - Google Patents

Abstract

The utility model relates to a layering is looked for water and is produced integration tubular column, include from last to down the oil-well pump of order connection, first screen pipe, first packer, first liquid accuse water finding switch, second packer, second liquid accuse water finding switch and plug. The first hydraulic control water exploration switch comprises a first outer pipe, an annular channel is formed in the side wall of the lower portion of the first outer pipe, at least one axial channel is formed in the side wall of the middle portion of the first outer pipe, the axial channels are communicated with the annular channel, and a one-way valve is arranged above each axial channel. The first outer pipe is internally sleeved with a first sliding sleeve, the first sliding sleeve and the first outer pipe are fixed through a first shear pin, and the second hydraulic control water finding switch is a normally closed water finding switch. The utility model discloses a tubular column, go into the back under the tubular column alright produce the layer production in order to begin to go up, directly suppress when needing the layer alright produce the layer production under switching, need not to play tubular column, easy operation repeatedly.

Description

Layered water finding and production integrated tubular column

Technical Field

The utility model relates to a machinery in oil recovery engineering field is looked for stifled water craft, especially relates to a layering is looked for water and is produced integration tubular column, and specially adapted needs the vertical well of earlier upper and lower layering exploitation order.

Background

In recent years, with the implementation of production increasing schemes such as increasing the number of wells, prolonging the production time, handling multiple times of oil wells and the like by water injection and steam injection measures, the water content of an oil well gradually rises, particularly the water content of a thin oil well is obviously increased, the oil yield is reduced, and the contradiction among oil well layers is increasingly prominent.

In the prior art, aiming at thin oil exploitation, a water exploration pipe column is generally required to be put in firstly, and the oil-water content of each layer is determined through liquid suction; and then according to the obtained data, a related water plugging production pipe column is put in, and the high water-bearing stratum is plugged for oil extraction production. The whole operation process is separated from the water detection by layers and production, and the pipe column needs to be repeatedly pulled out and put down, so that the operation is complex.

Therefore, the inventor provides the layered water finding and production integrated pipe column by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a layering is looked for water and is produced integration tubular column, is the compound tubular column that can realize looking for water and produce, and the tubular column goes into the back alright produce the layer production in order to begin, directly suppresses alright produce the layer production under switching when needing the layer change, need not to play tubular column, easy operation repeatedly.

The utility model aims at realizing the layered water finding and production integrated pipe column, which comprises an oil well pump, a first sieve pipe, a first packer, a first hydraulic control water finding switch, a second packer, a second hydraulic control water finding switch and a plug which are sequentially connected from top to bottom; the first hydraulic control water finding switch comprises a first outer pipe which is vertically arranged, an annular channel is formed in the side wall of the lower portion of the first outer pipe, at least one axial channel which extends along the axial direction of the annular channel is formed in the side wall of the middle portion of the first outer pipe and located above the annular channel, the axial channels are communicated with the annular channel, and a one-way valve which enables liquid to flow from outside to inside is arranged above each axial channel; a radial hole which can be communicated with the one-way valve is respectively formed in the position, corresponding to each one-way valve, of the inner wall of the middle part of the first outer pipe, and a plurality of first liquid inlet holes which are communicated with the annular channel are formed in the position, corresponding to the annular channel, of the outer wall of the lower part of the first outer pipe;

a first step hole with an expanded inner diameter is formed in the upper inner wall of the first outer pipe and above the axial channel, a first sliding sleeve is sleeved in the first outer pipe, a first step sleeve with an expanded outer diameter is formed in the upper part of the first sliding sleeve, and a first step part is formed at the outer side of the bottom of the first step sleeve; the first step sleeve is embedded in the first step hole in a sealing mode and can move in the first step hole along the axial direction of the first outer pipe, a certain first moving distance is reserved between the first step part and the bottom hole shoulder of the first step hole, the lower end of the first sliding sleeve is located above the radial hole, the outer wall of the lower portion of the first sliding sleeve is in sealing contact with the inner wall of the first outer pipe, and the first sliding sleeve and the first outer pipe are fixed through first shear pins; the second hydraulic control water finding switch is a normally closed water finding switch.

In a preferred embodiment of the present invention, the first outer tube comprises an outer tube and an inner tube sleeved and fixed in the outer tube, the first liquid inlet hole is formed on the lower side wall of the outer tube, the first sliding sleeve is sleeved in the inner tube and fixed with the inner tube through the first shear pin, and the first step hole is formed on the upper inner wall of the inner tube; a first annular mounting groove is formed in the inner wall of the middle of the outer layer pipe, a convex ring is formed on the outer wall of the lower portion of the inner layer pipe in an outward protruding mode, the convex ring is embedded in the first annular mounting groove, a certain reserved distance is reserved between the bottom surface of the convex ring and the lower side groove wall of the first annular mounting groove, and an annular space formed by the reserved distance forms an annular channel; the axial channel is arranged in the lower side wall of the convex ring and penetrates through the bottom surface of the convex ring, the one-way valve is arranged in the upper side wall of the convex ring, the radial hole is arranged on the lower inner wall of the inner-layer pipe, and the lower outer wall of the inner-layer pipe is in sealing contact with the lower inner wall of the outer-layer pipe.

In a preferred embodiment of the present invention, at least one limiting groove is formed in the outer wall of the upper portion of the protruding ring along the radial direction of the inner tube, and the number of the limiting grooves is the same as the number of the axial channels; the upper end of the axial channel is communicated with the limiting groove, the radial hole is formed in the bottom of the limiting groove, a valve ball is embedded in the limiting groove, the diameter of the valve ball is larger than that of the axial channel and that of the radial hole, and the axial channel and the valve ball covered at the top opening of the axial channel form a one-way valve.

The utility model discloses an in the preferred embodiment, set up first exhaust hole on the upper portion pipe wall of inner tube and correspond the first sliding sleeve part of first step cover below, set up the second exhaust hole that switches on with first exhaust hole correspondence on the upper portion pipe wall of outer tube, first exhaust hole and second exhaust hole all are linked together with the annular space that first migration distance constitutes.

In a preferred embodiment of the present invention, the outer pipe includes a first upper connecting pipe and a first lower connecting pipe which are vertically disposed, a lower inner wall of the first upper connecting pipe forms a second step hole with an enlarged inner diameter downwards, and an upper inner wall of the first lower connecting pipe forms a third step hole with an enlarged inner diameter upwards; the hole walls of the second stepped hole and the third stepped hole are both fixed with the outer wall of the lower portion of the convex ring in a threaded mode, a first annular mounting groove is formed among the top hole shoulder of the second stepped hole, the hole wall of the third stepped hole and the bottom hole shoulder of the third stepped hole, the second exhaust hole is formed in the side wall of the first upper connecting pipe, and the first liquid inlet hole is formed in the hole wall of the second stepped hole.

The utility model discloses an in a preferred embodiment, the lower part outer wall of first ladder cover, first sliding sleeve, first upper connection pipe lie in second exhaust hole top part's inner wall, first upper connection pipe lie in the inner wall of second exhaust hole and first annular mounting groove between part, the lower part pore wall of second shoulder hole and the lower extreme outer wall of inlayer pipe have seted up first sealed annular respectively, overlap respectively in every first sealed annular and establish first sealing washer.

In a preferred embodiment of the present invention, a first limiting step with a reduced inner diameter is formed upward on the inner wall of the upper end of the outer tube, and a second limiting step with a reduced inner diameter is formed downward on the inner wall of the lower end of the outer tube; the two ends of the inner-layer pipe are respectively propped against the first limiting step and the second limiting step, and at least one part of the upper end surface of the first sliding sleeve is propped against the first limiting step.

In a preferred embodiment of the present invention, the second hydraulic control water detection switch includes a second outer tube vertically disposed, a second annular mounting groove is formed on an inner wall of the second outer tube, a second sliding sleeve is sleeved inside the second outer tube, a second step sleeve with an enlarged outer diameter is formed upward on an upper portion of the second sliding sleeve, and a second step portion is formed outside a bottom of the second step sleeve; the second step sleeve is embedded in the second annular mounting groove in a sealing mode and can move in the second annular mounting groove along the axial direction of the second outer pipe, a certain second moving distance is reserved between the second step part and the lower side groove wall of the second annular mounting groove, and the lower outer wall of the second sliding sleeve is in sealing contact with the inner wall of the second outer pipe; a plurality of second liquid inlet holes are formed in the pipe wall of the second outer pipe and in positions corresponding to the second step sleeves at intervals along the circumferential direction of the second step sleeves, and the second outer pipe and the second sliding sleeve are fixed through second shear pins.

In a preferred embodiment of the present invention, a second sieve tube is fixedly disposed outside the upper portion of the second outer tube and corresponding to the second liquid inlet hole.

In a preferred embodiment of the present invention, the second sieve tube comprises a tube body, a plurality of through holes are formed in a side wall of the tube body, an upper end of the tube body is fixedly connected with the second outer tube, and an inner wall of a lower end of the tube body is tightly attached to an outer wall of the second outer tube; the middle part internal diameter of body is greater than the external diameter of second outer tube, forms an annular transition space between the middle part inner wall of body and the outer wall of second outer tube, and through-hole and second feed liquor hole all are linked together with annular transition space.

The utility model discloses an in a preferred embodiment, seted up first ring groove at the lower extreme outer wall of second sliding sleeve, set up a snap ring at first ring groove is embedded, seted up second ring groove in the lower extreme inner wall of second outer tube and the below that is located first sliding sleeve, the snap ring can block to establish in second ring groove.

In a preferred embodiment of the present invention, the snap ring is an annular iron ring, and a longitudinal notch is formed on a side wall of the iron ring.

In a preferred embodiment of the present invention, a third exhaust hole is formed in the wall of the second outer tube corresponding to the second sliding sleeve below the second step sleeve, and the third exhaust hole is communicated with the annular space formed by the second moving distance.

In a preferred embodiment of the present invention, the second outer tube comprises a second upper connection tube, a middle connection tube and a second lower connection tube which are sequentially fixed from top to bottom, the inner diameter of the middle connection tube is smaller than the inner diameter of the second upper connection tube and the inner diameter of the second lower connection tube, and a second annular mounting groove is formed between the lower end surface of the second upper connection tube, the inner wall of the middle connection tube and the upper end surface of the second lower connection tube; the upper end of the second sieve tube is fixed with the second upper connecting tube, the second liquid inlet hole and the third exhaust hole are both arranged on the tube wall of the middle connecting tube, and the second annular clamping groove is arranged on the inner wall of the second lower connecting tube.

The utility model discloses an in a preferred embodiment, the lower extreme outer wall of taking over on the second, the upper end inner wall of second sliding sleeve just are located the top in second feed liquor hole and the lower extreme outer wall of second sliding sleeve just are located the top of snap ring and have seted up the sealed annular of second respectively, overlap respectively in every sealed annular of second and establish the second sealing washer.

In a preferred embodiment of the present invention, the shearing pressure of the second shear pin is greater than the shearing pressure of the first shear pin.

The utility model discloses an in the preferred embodiment, still connect an anticorrosive nipple joint respectively between first packer and first liquid accuse water finding switch and between second packer and the second liquid accuse water finding switch.

From the above, the tubular column in the utility model can separate the upper production zone from the lower production zone after the first packer and the second packer are set, and through the cooperation of the first hydraulic control water finding switch and the second hydraulic control water finding switch, the production of the upper production zone can be directly started after each packer is set, which is simple and convenient; when needing to switch to production of lower production zone, need not any operation to the tubular column, direct pump truck is suppressed and can be traded the layer and succeed, trades the layer action and has obvious pressure registration change, can directly observe, and the effect is directly perceived reliable. The whole operation process does not need to repeatedly pull out the tubular column, and the two-layer water exploration and synchronous production can be realized by putting in the tubular column once. Meanwhile, the first hydraulic control water finding switch ingeniously utilizes the difference of the cross sectional areas of the upper end surface and the lower end surface of the first sliding sleeve, the first sliding sleeve can move downwards by utilizing the pressure difference between the two sides of the first sliding sleeve when the first hydraulic control water finding switch is pressed, and the structure is simpler.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

FIG. 1: do the utility model provides a structural schematic of water and production integration tubular column is looked for in layering.

FIG. 2: for the utility model provides a structure schematic diagram when first liquid accuse water detection switch is in to open.

FIG. 3: for the utility model provides a structure schematic diagram when first liquid accuse water detection switch is in to close.

FIG. 4: do the utility model provides a structural schematic diagram of inlayer pipe.

FIG. 5: for the utility model provides a cross-sectional view of inlayer pipe.

FIG. 6: to the utility model provides a top view of inlayer pipe.

FIG. 7: do the utility model provides a first structure schematic diagram of taking over on.

FIG. 8: do the utility model provides a structural schematic of takeover under.

FIG. 9: do the utility model provides a second hydraulic control water detection switch is in the structure schematic diagram when closing.

FIG. 10: do the utility model provides a second hydraulic control water detection switch is in the structural schematic diagram when opening.

The reference numbers illustrate:

10. an oil well pump;

20. a first sieve tube;

30. a first packer;

40. a first hydraulic control water finding switch;

41. an outer tube;

411. a first upper adapter tube; 4111. a second stepped bore; 4112. a second vent hole; 4113. a first limit step;

412. a first lower adapter tube; 4121. a first liquid inlet hole; 4122. a third stepped bore; 4123. a second limit step;

413. an annular channel;

42. an inner layer tube; 421. a convex ring; 4211. an axial channel; 4212. a limiting groove; 422. a radial bore; 423. a first stepped hole; 424. a first exhaust port;

43. a valve ball;

44. a first sliding sleeve; 441. a first step cover;

45. first shear pin

50. A second packer;

60. a second hydraulic control water finding switch;

61. a second outer tube; 611. a second upper adapter tube; 612. a middle connecting pipe; 6121. a second liquid inlet hole; 6122. a third vent hole; 613. a second lower adapter tube; 6131. a second annular card slot;

62. a second sliding sleeve; 621. a second step sleeve; 622. a first ring-shaped card slot; 6221. a snap ring;

63. a second shear pin;

64. a second sieve tube; 641. an annular transition space;

70. plugging with a thread;

80. an anti-corrosion short section;

91. an upper production layer; 92. and (5) a lower production layer.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1 to 8, the present embodiment provides a layered water exploration and production integrated pipe string, which includes an oil well pump 10, a first screen 20, a first packer 30, a first hydraulic control water exploration switch 40, a second packer 50, a second hydraulic control water exploration switch 60, and a plug 70, which are sequentially connected from top to bottom.

The first hydraulic control water-finding switch 40 is a normally open water-finding switch, the first hydraulic control water-finding switch 40 comprises a vertically arranged first outer pipe, an annular passage 413 is arranged in the side wall of the lower part of the first outer pipe, at least one axial passage 4211 extending along the axial direction of the annular passage is arranged in the side wall of the middle part of the first outer pipe and above the annular passage 413, the axial passage 4211 is communicated with the annular passage 413, and a one-way valve capable of enabling liquid to flow from outside to inside is arranged above each axial passage 4211. A radial hole 422 which can be communicated with the check valve is respectively arranged on the inner wall of the middle part of the first outer pipe and the position corresponding to each check valve, and a plurality of first liquid inlet holes 4121 which are communicated with the annular channel 413 are arranged on the outer wall of the lower part of the first outer pipe and the position corresponding to the annular channel 413.

A first stepped hole 423 with an enlarged inner diameter is formed in the upper inner wall of the first outer tube above the axial passage 4211, the first outer tube is sleeved with a first sliding sleeve 44, a first stepped sleeve 441 with an enlarged outer diameter is formed in the upper portion of the first sliding sleeve 44, and a first stepped portion is formed outside the bottom of the first stepped sleeve 441. The first stepped sleeve 441 is embedded in the first stepped hole 423 in a sealing manner and can move axially along the first outer tube in the first stepped hole 423, a certain first moving distance is reserved between the first stepped portion and the bottom hole shoulder of the first stepped hole 423, the lower end of the first sliding sleeve 44 is located above the radial hole 422, the outer wall of the lower portion of the first sliding sleeve 44 is in sealing contact with the inner wall of the first outer tube, and the first sliding sleeve 44 and the first outer tube are fixed through the first shear pins 45. The second hydraulic control water detection switch 60 is a normally closed water detection switch.

Specifically, the above-mentioned check valve can make the external liquid enter the inner cavity of the first outer tube through the radial hole 422 after entering the first liquid inlet hole 4121. The first packer 30 and the second packer 50 are constructed in the prior art, for example, the first packer 30 may be a Y111 packer and the second packer 50 may be a Y211 packer. The number of the axial passages 4211 is determined according to the actual liquid passing requirement, for example, in the present embodiment, three axial passages 4211 are provided at regular intervals in the axial direction of the convex ring 421.

In the initial position, as shown in FIG. 2, the first pilot-operated water detection switch 40 is in the open position because the lower end of the first runner 44 is located above the radial hole 422. When the layer needs to be changed and the pressure is applied to the first outer pipe, the cross-sectional area of the upper end surface of the first sliding sleeve 44 is the sum of the cross-sectional area of the first step part and the cross-sectional area of the lower end surface of the first sliding sleeve 44, so that the cross-sectional area of the upper end surface of the first sliding sleeve 44 is larger than that of the lower end surface thereof. Meanwhile, the first stepped sleeve 441 is in sealing contact with the first stepped hole 423, and the lower outer wall of the first sliding sleeve 44 is in sealing contact with the inner wall of the first outer tube, so that the first stepped portion is not subjected to internal pressure, and only the upper end surface of the first sliding sleeve 44 and the lower end surface of the first sliding sleeve 44 are subjected to internal pressure.

In addition, because the shaft is deep, the length of the first step sleeve 441 is short compared with the depth of the shaft, and the pressure at the upper end face of the first sliding sleeve 44 can be approximately equal to the pressure at the lower end face of the first sliding sleeve 44, so that the force applied to the upper end face of the first sliding sleeve 44 is greater than the force applied to the lower end face of the first sliding sleeve 44, and the first sliding sleeve 44 is pushed downwards under the action of the pressure difference at the two ends of the first sliding sleeve 44 until the first shear pins 45 are sheared off. After the cutting, the first sliding sleeve 44 slides downwards until the first step part abuts against the bottom hole shoulder of the first step hole 423, and at this time, the first step sleeve 441 covers the radial hole 422, so that the first hydraulic-controlled water detection switch 40 is closed, as shown in fig. 3.

In detail, the whole working process of the pipe column is as follows: in use, the tubing string is run into position using tubing, and the first packer 30 and the second packer 50 separate the upper production zone 91 from the lower production zone 92 by raising and lowering the set first packer 30 and the set second packer 50. At this time, since the first hydraulic control water detection switch 40 is turned on and the second hydraulic control switch is turned off, the oil well pump 10 can directly pump the upper production zone 91 after starting to work. At this time, the liquid in the upper production zone 91 sequentially enters the annular passage 413 and the axial passage 4211 through the first liquid inlet hole 4121, enters the inner cavity of the first outer tube through the radial hole 422 after the unidirectional conduction action of the one-way valve, and then can be exploited through the pumping action of the oil well pump 10.

During pumping, the oil-water content of the pumped liquid can be observed, and if the upper production zone 91 contains less water, production is maintained; if the upper productive layer 91 contains more water, the layer changing operation is started, specifically: the pipeline of the pump truck is connected to the wellhead to pressurize the oil casing annulus, hydraulic pressure is transmitted to the inner cavities of the first hydraulic control water exploration switch 40 and the second hydraulic control water exploration switch 60 through the first sieve tube 20, when the pressure is slowly increased to a certain value (increased to 18Mpa in the embodiment), the pressure can be suddenly reduced to 0Mpa (the pressure indication in the process of observing the pump truck at the wellhead can be directly observed), at the moment, layer changing is successful, so far, the first hydraulic control water exploration switch 40 is located at a closed position, the second hydraulic control water exploration switch 60 is located at an open position, and after the oil well pump 10 recovers to work, the production layer 92 can be sucked. The whole layer changing operation is irreversible, and the whole pipe column can only be changed once. By adopting the mining mode of going up and down firstly, the trouble of operation can be reduced for the sand producing well, and the operation is more convenient.

Therefore, the tubular column in the embodiment can separate the upper production zone 91 from the lower production zone 92 after the first packer 30 and the second packer 50 are set, and the production of the upper production zone 91 can be directly started after the packers are set through the matching of the first hydraulic control water detection switch 40 and the second hydraulic control water detection switch 60, so that the tubular column is simple and convenient; when needing to switch to lower production zone 92 production, need not any operation to the tubular column, direct pump truck presses and can the layer change succeed, and the action of changing the layer has obvious pressure registration change, can directly observe, and the effect is directly perceived reliable. The whole operation process does not need to repeatedly pull out the tubular column, and the two-layer water exploration and synchronous production can be realized by putting in the tubular column once. Meanwhile, the first hydraulic control water exploration switch 40 skillfully utilizes the difference of the cross-sectional areas of the upper end surface and the lower end surface of the first sliding sleeve 44, and the first sliding sleeve 44 can move downwards by utilizing the pressure difference between the two sides of the first sliding sleeve when being pressed, so that the structure is simpler.

In a specific implementation manner, for convenience of processing and installation, as shown in fig. 2 to 6, the first outer pipe includes an outer pipe 41 and an inner pipe 42 sleeved and fixed in the outer pipe 41, the first liquid inlet hole 4121 is formed in a lower side wall of the outer pipe 41, the first sliding sleeve 44 is sleeved in the inner pipe 42 and fixed to the inner pipe 42 through the first shear pin 45, and the first stepped hole 423 is formed in an upper inner wall of the inner pipe 42. First annular mounting groove has been seted up to outer pipe 41's middle part inner wall, and the lower part outer wall of inlayer pipe 42 is outwards protruding to be established and is formed bulge loop 421, and bulge loop 421 inlays to be established in first annular mounting groove, and leaves certain reserve distance between the lower side cell wall of the bottom surface of bulge loop 421 and first annular mounting groove, and the annular space that the reserve distance formed constitutes foretell annular channel 413. The axial passage 4211 is arranged in the lower side wall of the convex ring 421 and penetrates through the bottom surface of the convex ring 421, the check valve is arranged in the upper side wall of the convex ring 421, the radial hole 422 is arranged on the lower inner wall of the inner layer tube 42, and the lower outer wall of the inner layer tube 42 is in sealing contact with the lower inner wall of the outer layer tube 41.

The first shear pin 45 penetrates through the wall of the inner pipe 42 along the radial direction of the inner pipe 42 and is inserted into the outer wall of the first sliding sleeve 44, a threaded hole is generally formed in the wall of the inner pipe 42, a groove is formed in the position, corresponding to the threaded hole, of the outer wall of the first sliding sleeve 44, and the first shear pin 45 is inserted into the threaded hole and the groove.

Further, in order to facilitate the above-mentioned processing and installation of the check valve, as shown in fig. 2 to 6, at least one retaining groove 4212 is formed in the upper outer wall of the male ring 421 in the radial direction of the inner tube 42, and the number of the retaining grooves 4212 is the same as the number of the axial passages 4211. The upper end of the axial passage 4211 is communicated with the limiting groove 4212, the radial hole 422 is arranged on the groove bottom of the limiting groove 4212, a valve ball 43 is embedded in the limiting groove 4212, the diameter of the valve ball 43 is larger than that of the axial passage 4211 and that of the radial hole 422, and the axial passage 4211 and the valve ball 43 covered at the top opening of the axial passage 4211 form the one-way valve.

The axial length of the limiting groove 4212 along the inner pipe 42 is greater than the diameter of the valve ball 43, so that when the upper production zone 91 is mined, liquid can smoothly push the valve ball 43 upwards. The upper end surface of the protruding ring 421 may abut against the upper groove wall of the first annular mounting groove (i.e. the top hole shoulder of the second step hole 4111), or may leave a small gap with the upper groove wall of the first annular mounting groove, depending on the installation requirement. The valve ball 43 can be limited in the limit groove 4212 by matching between the limit groove 4212, the upper side groove wall of the first annular mounting groove and the top opening of the axial passage 4211, and is prevented from running out.

Thus, when the first hydraulic control water exploration switch 40 is in the open position, the valve ball 43 blocks the axial passage 4211 under the action of gravity, and even if liquid exists in the inner cavity of the first outer pipe before oil extraction by the oil well pump 10, the liquid cannot enter the axial passage 4211 due to the blocking effect of the valve ball 43 after entering the radial hole 422. When the oil well pump 10 is used for oil extraction, after liquid enters the axial passage 4211, the liquid can jack the valve ball 43, then flows into the inner cavity of the first outer pipe through the radial hole 422, and then can play a role of one-way conduction through the matching of the valve ball 43 and the top opening of the axial passage 4211.

Meanwhile, the check valve is arranged in the side wall of the first outer pipe and is not arranged in the middle of the inner cavity of the whole first outer pipe, and the check valve is mainly used for playing a role in guiding and conducting and ensuring that hydraulic pressure can be normally transmitted to the inner cavity of the second hydraulic control water detection switch 60 located below when a layer is pressed and changed, so that the second hydraulic control water detection switch 60 is switched from a closed position to an open position under the hydraulic pressure.

In practical applications, in order to make the first sliding sleeve 44 slide downwards more smoothly, as shown in fig. 2, a first exhaust hole 424 is formed on the upper pipe wall of the inner pipe 42 and a portion of the first sliding sleeve 44 corresponding to the lower portion of the first step sleeve 441, a second exhaust hole 4112 communicated with the first exhaust hole 424 is formed on the upper pipe wall of the outer pipe 41, and the first exhaust hole 424 and the second exhaust hole 4112 are both communicated with the annular space formed by the first moving distance, so as to prevent the sliding of the first sliding sleeve 44 from being influenced by the air pressure existing in the annular space.

The number of the first venting holes 424 and the second venting holes 4112 is the same, and the specific number is determined according to the requirement, for example, in this embodiment, one first venting hole 424 and one second venting hole 4112 are provided.

Further, for easier processing and installation, as shown in fig. 2, 3, 7 and 8, the outer tube 41 includes a first upper connection tube 411 and a first lower connection tube 412 which are arranged up and down, a second stepped hole 4111 with an enlarged inner diameter is formed downward on the lower inner wall of the first upper connection tube 411, and a third stepped hole 4122 with an enlarged inner diameter is formed upward on the upper inner wall of the first lower connection tube 412. The hole walls of the second stepped hole 4111 and the third stepped hole 4122 are both fixed with the outer wall of the lower portion of the convex ring 421 by screw threads, the top hole shoulder of the second stepped hole 4111, the hole wall of the third stepped hole 4122 and the bottom hole shoulder of the third stepped hole 4122 form the first annular mounting groove, the second exhaust hole 4112 is formed in the side wall of the first upper connecting pipe 411, and the first liquid inlet hole 4121 is formed in the hole wall of the second stepped hole 4111.

In order to avoid the rotation between the first upper connecting pipe 411 and the protruding ring 421 and between the first lower connecting pipe 412 and the protruding ring 421, anti-rotation pins are respectively inserted between the lower hole wall of the second stepped hole 4111 and the upper hole wall of the third stepped hole 4122 and the lower outer wall of the protruding ring 421, so as to ensure the stability of the structure.

In order to ensure the sealing performance during the pressurization and oil extraction, as shown in fig. 2, first sealing ring grooves are respectively formed in the outer wall of the lower part of the first step sleeve 441, the outer wall of the lower end of the first sliding sleeve 44, the inner wall of the part, above the second exhaust hole 4112, of the first upper connecting pipe 411, the inner wall of the part, between the second exhaust hole 4112 and the first annular mounting groove, the lower hole wall of the second step hole 4111 and the outer wall of the lower end of the inner pipe 42, and a first sealing ring is respectively sleeved in each first sealing ring groove.

The outer wall of the first step sleeve 441 and the hole wall of the first step hole 423, the lower end outer wall of the first sliding sleeve 44 and the inner wall of the inner pipe 42, the upper outer wall of the inner pipe 42 and the inner wall of the first upper connecting pipe 411, and the threaded connection between the first upper connecting pipe 411 and the convex ring 421 are in sealing contact, so that the first step part is not pressed, when the oil well pump 10 is used for oil production, liquid can smoothly flow into the inner cavity of the first outer pipe through the radial hole 422 after being conducted in one direction through the check valve, and the normal operation of the oil production is ensured.

In a possible implementation, in order to facilitate assembly while ensuring structural stability, as shown in fig. 2, 7 and 8, a first limit step 4113 having a reduced inner diameter is formed upwardly at the inner wall of the upper end of the outer tube 41, and a second limit step 4123 having a reduced inner diameter is formed downwardly at the inner wall of the lower end of the outer tube 41. Two ends of the inner tube 42 respectively abut against the first limiting step 4113 and the second limiting step 4123, and at least a portion of the upper end surface of the first sliding sleeve 44 abuts against the first limiting step 4113. The second limiting step 4123 of the first limiting step 4113 is formed on the inner wall of the first lower connecting pipe 412 of the first upper connecting pipe 411.

Therefore, in the process of running the pipe string, the first limiting step 4113 and the second limiting step 4123 can protect the inner pipe 42 and the first sliding sleeve 44 to a certain extent, and the first shear pin 45 is prevented from being cut off in advance. It should be noted that, because there is no seal between the upper end surface of the first sliding sleeve 44 and the first limiting step 4113, even if the upper end surface of the first sliding sleeve 44 completely abuts against the first limiting step 4113, when the pressure is applied, the liquid can flow into the gap between the upper end surface of the first sliding sleeve 44 and the first limiting step 4113, so as to generate an internal pressure on the upper end surface of the first sliding sleeve 44.

Further, as shown in fig. 9 and 10, the second hydraulic control water searching switch 60 includes a second outer tube 61 vertically disposed, a second annular mounting groove is formed on an inner wall of the second outer tube 61, a second sliding sleeve 62 is sleeved in the second outer tube 61, a second step sleeve 621 with an enlarged outer diameter is formed at an upper portion of the second sliding sleeve 62, and a second step portion is formed at an outer side of a bottom of the second step sleeve 621. The second step sleeve 621 is embedded in the second annular mounting groove in a sealing manner and can move axially along the second outer tube 61 in the second annular mounting groove, a certain second moving distance is reserved between the second step part and the lower side groove wall of the second annular mounting groove, and the lower outer wall of the second sliding sleeve 62 is in sealing contact with the inner wall of the second outer tube 61. A plurality of second liquid inlet holes 6121 are formed in the pipe wall of the second outer pipe 61 at intervals along the circumferential direction of the second stepped sleeve 621, and the second outer pipe 61 and the second sliding sleeve 62 are fixed by second shear pins 63.

The second shear pin 63 is located below the second liquid inlet hole 6121, and the second shear pin 63 radially penetrates through a threaded hole formed in the tube wall of the second outer tube 61 along the second outer tube 61 and is inserted into a groove formed in the outer wall of the second step sleeve 621. In addition, the upper end surface of the second sliding sleeve 62 can abut against the upper side groove wall of the second annular mounting groove, and a certain gap can be left between the upper end surface of the second sliding sleeve and the upper side groove wall of the second annular mounting groove; meanwhile, the upper end surface of the second sliding sleeve 62 can be completely abutted against the upper side groove wall of the second annular mounting groove, or only a part of the upper end surface can be abutted against the upper side groove wall of the second annular mounting groove. Because the upper end face of the second sliding sleeve 62 is not sealed with the upper side groove wall of the second annular mounting groove, when the second sliding sleeve is pressurized, liquid can flow into a gap between the upper end face of the second sliding sleeve 62 and the upper side groove wall of the second annular mounting groove, and then internal pressure is generated on the upper end face of the second sliding sleeve 62.

In the initial position, as shown in fig. 9, the second switch 60 is in the closed position because the second stepped sleeve 621 blocks the second fluid inlet hole 6121. When the layer changing operation needs to be carried out, the pump truck presses the oil sleeve annulus, the hydraulic pressure is transmitted to the inner cavity of the second hydraulic control water exploration switch 60 through the first sieve tube 20, and the cross-sectional area of the upper end face of the second sliding sleeve 62 is the sum of the cross-sectional area of the second step part and the cross-sectional area of the lower end face of the second sliding sleeve 62, so that the cross-sectional area of the upper end face of the second sliding sleeve 62 is larger than that of the lower end face of the second sliding sleeve 62.

As can be seen from the above-mentioned stress analysis of the first sliding sleeve 44, the second step portion is not subjected to internal pressure, the force applied to the upper end surface of the second sliding sleeve 62 is greater than the force applied to the lower end surface thereof, and the second sliding sleeve 62 is pushed downward under the action of the pressure difference between the two ends of the second sliding sleeve 62 until the second shear pin 63 is sheared off. After the cutting, the second sliding sleeve 62 slides downwards until the second step portion abuts against the lower side groove wall of the second annular mounting groove, and at this time, the positions of the second step sleeve 621 and the second liquid inlet hole 6121 are staggered, so that the second hydraulic control water detection switch 60 is opened, as shown in fig. 10, and layer changing is realized.

In practical application, in order to facilitate filtering impurities in the liquid during oil extraction, as shown in fig. 9, a second sieve pipe 64 is sleeved and fixed at a position corresponding to the second liquid inlet port 6121 and outside the upper portion of the second outer pipe 61.

In detail, the second sieve tube 64 includes a tube body, a plurality of through holes are formed on a side wall of the tube body, an upper end of the tube body is fixedly connected with the second outer tube 61, and an inner wall of a lower end of the tube body is tightly attached to an outer wall of the second outer tube 61. The middle inner diameter of the tube body is larger than the outer diameter of the second outer tube 61, an annular transition space 641 is formed between the middle inner wall of the tube body and the outer wall of the second outer tube 61, and the through hole and the second liquid inlet hole 6121 are both communicated with the annular transition space 641.

So, be in the open position at second hydraulic control water detection switch 60, when exploiting lower production zone 92, liquid advanced gets into annular transition space 641 behind each through-hole, then reentries the inner chamber of second outer pipe 61 through second feed liquor hole 6121, through the aperture restriction effect of each through-hole, can block impurity slightly bigger outside, plays filterable effect, avoids great impurity to block up second feed liquor hole 6121 and influences normal operation.

Further, in order to limit the position of the second sliding sleeve 62 after moving downward, and avoid bringing the second sliding sleeve 62 out when tools such as a test instrument are put in at a later stage, and the situation that the second hydraulic control water finding switch 60 is closed again is caused, as shown in fig. 9 and 10, a first annular clamping groove 622 is formed in the outer wall of the lower end of the second sliding sleeve 62, a clamping ring 6221 is embedded in the first annular clamping groove 622, a second annular clamping groove 6131 is formed in the inner wall of the lower end of the second outer tube 61 and below the first sliding sleeve 44, and the clamping ring 6221 can be clamped in the second annular clamping groove 6131.

Specifically, the snap ring 6221 is an annular iron ring, and a longitudinal slit is formed in a side wall of the iron ring, so that the snap ring 6221 itself has a certain elasticity. When installed in the first ring groove 622, the entire iron ring is in a squeezed state; when the second sliding sleeve 62 moves downward to a position where the iron ring faces the second annular clamping groove 6131, the iron ring expands to be embedded into the second annular clamping groove 6131, so that the second sliding sleeve 62 is limited. Of course, other manners for limiting the position of the second sliding sleeve 62 can be adopted according to the requirement, and this embodiment is only for illustration.

Further, in order to make the second sliding sleeve 62 slide downward more smoothly, as shown in fig. 9, a third vent hole 6122 is formed in a portion of the tube wall of the second outer tube 61 corresponding to the second sliding sleeve 62 below the second step sleeve 621, and the third vent hole 6122 is communicated with an annular space formed by the second moving distance, so as to prevent the sliding of the second sliding sleeve 62 from being influenced by the air pressure existing in the annular space.

Further, for convenience of processing and installation, as shown in fig. 9, the second outer tube 61 includes a second upper connection pipe 611, a middle connection pipe 612, and a second lower connection pipe 613 fixed in sequence from top to bottom, an inner diameter of the middle connection pipe 612 is smaller than an inner diameter of the second upper connection pipe 611 and an inner diameter of the second lower connection pipe 613, and a second annular installation groove is formed between a lower end surface of the second upper connection pipe 611, an inner wall of the middle connection pipe 612, and an upper end surface of the second lower connection pipe 613. The upper end of the second sieve tube 64 is fixed to the second upper connecting tube 611, the second liquid inlet port 6121 and the third gas outlet port 6122 are both disposed on the tube wall of the middle connecting tube 612, and the second annular groove 6131 is disposed on the inner wall of the second lower connecting tube 613.

Generally, the inner wall of the upper end of the second screen pipe 64 is screwed with the outer wall of the second upper connecting pipe 611, the outer wall of the lower end of the first upper connecting pipe 411 is screwed with the inner wall of the upper end of the middle connecting pipe 612, the inner wall of the lower end of the middle connecting pipe 612 is screwed with the outer wall of the upper end of the second lower connecting pipe 613, and anti-rotation pins are inserted at the screw joints to prevent relative rotation.

Further, in order to ensure the sealing performance during the pressing, as shown in fig. 9, second sealing ring grooves are respectively formed in the outer wall of the lower end of the second upper connecting pipe 611, the inner wall of the upper end of the second sliding sleeve 62 and located above the second liquid inlet hole 6121, and the outer wall of the lower end of the second sliding sleeve 62 and located above the snap ring 6221, and a second sealing ring is respectively sleeved in each second sealing ring groove.

In addition, during the layer changing operation, in order to avoid the second hydraulic control water detection switch 60 from being opened early to cause pressure relief, and the first hydraulic control water detection switch 40 cannot be normally closed, the shearing pressure of the second shear pin 63 is greater than that of the first shear pin 45. Thus, when the layer is pressed, the first shear pin 45 is firstly sheared, so that the first hydraulic control water detection switch 40 is firstly closed, then the second shear pin 63 is sheared again, and then the second hydraulic control water detection switch 60 is opened, thereby ensuring the success of layer changing.

Further, in order to prolong the service life of the pipe string, as shown in fig. 1, an anti-corrosion nipple 80 is connected between the first packer 30 and the first hydraulic control water-exploration switch 40 and between the second packer 50 and the second hydraulic control water-exploration switch 60 respectively. Wherein, anticorrosive nipple joint 80 is the tubular structure that fills with anticorrosive material, and specific structure is prior art, and no longer repeated here.

The above are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims (17)

1. A layered water finding and production integrated pipe column is characterized by comprising an oil well pump, a first sieve pipe, a first packer, a first hydraulic control water finding switch, a second packer, a second hydraulic control water finding switch and a plug which are sequentially connected from top to bottom;

the first hydraulic control water exploration switch comprises a first outer pipe which is vertically arranged, an annular channel is formed in the side wall of the lower portion of the first outer pipe, at least one axial channel which extends along the axial direction of the annular channel is formed in the side wall of the middle portion of the first outer pipe and located above the annular channel, the axial channels are communicated with the annular channel, and a one-way valve which enables liquid to flow from outside to inside is arranged above each axial channel; a radial hole capable of being communicated with the one-way valve is formed in the position, corresponding to each one-way valve, of the inner wall of the middle part of the first outer pipe, and a plurality of first liquid inlet holes communicated with the annular channel are formed in the position, corresponding to the annular channel, of the outer wall of the lower part of the first outer pipe;

a first stepped hole with an expanded inner diameter is formed in the upper inner wall of the first outer pipe and above the axial channel, a first sliding sleeve is sleeved in the first outer pipe, a first stepped sleeve with an expanded outer diameter is formed in the upper portion of the first sliding sleeve, and a first stepped portion is formed on the outer side of the bottom of the first stepped sleeve; the first step sleeve is embedded in the first step hole in a sealing mode and can move in the first step hole along the axial direction of the first outer pipe, a certain first moving distance is reserved between the first step part and the bottom hole shoulder of the first step hole, the lower end of the first sliding sleeve is located above the radial hole, the outer wall of the lower portion of the first sliding sleeve is in sealing contact with the inner wall of the first outer pipe, and the first sliding sleeve and the first outer pipe are fixed through first shear pins; the second hydraulic control water finding switch is a normally closed water finding switch.

2. The integrated layered water-finding and production tubing string of claim 1,

the first outer pipe comprises an outer pipe and an inner pipe which is sleeved and fixed in the outer pipe, the first liquid inlet hole is formed in the side wall of the lower portion of the outer pipe, the first sliding sleeve is sleeved in the inner pipe and fixed with the inner pipe through the first shear pin, and the first stepped hole is formed in the inner wall of the upper portion of the inner pipe;

a first annular mounting groove is formed in the inner wall of the middle of the outer layer pipe, a convex ring is formed on the outer wall of the lower portion of the inner layer pipe in an outward protruding mode, the convex ring is embedded in the first annular mounting groove, a certain reserved distance is reserved between the bottom surface of the convex ring and the lower side groove wall of the first annular mounting groove, and an annular space formed by the reserved distance forms the annular channel; the axial channel is arranged in the side wall of the lower part of the convex ring and penetrates through the bottom surface of the convex ring, the one-way valve is arranged in the side wall of the upper part of the convex ring, the radial hole is arranged on the inner wall of the lower part of the inner layer pipe, and the outer wall of the lower end of the inner layer pipe is in sealing contact with the inner wall of the lower end of the outer layer pipe.

3. The integrated layered water exploration and production tubing string of claim 2,

at least one limiting groove is formed in the outer wall of the upper portion of the convex ring along the radial direction of the inner-layer pipe, and the number of the limiting grooves is the same as that of the axial channels;

the upper end of the axial channel is communicated with the limiting groove, the radial hole is formed in the groove bottom of the limiting groove, a valve ball is embedded in the limiting groove, the diameter of the valve ball is larger than that of the axial channel and that of the radial hole, and the valve ball covers the axial channel and the top opening of the axial channel to form the one-way valve.

4. The integrated layered water exploration and production tubing string of claim 2,

the upper pipe wall of the outer pipe is provided with a second exhaust hole correspondingly communicated with the first exhaust hole, and the first exhaust hole and the second exhaust hole are communicated with an annular space formed by the first moving distance.

5. The integrated layered water-finding and production tubing string of claim 4,

the outer layer pipe comprises a first upper connecting pipe and a first lower connecting pipe which are arranged up and down, the inner wall of the lower part of the first upper connecting pipe downwards forms a second stepped hole with an enlarged inner diameter, and the inner wall of the upper part of the first lower connecting pipe upwards forms a third stepped hole with an enlarged inner diameter;

the second shoulder of second shoulder hole the pore wall of second step hole the pore wall of third step hole and constitute between the bottom shoulder of third step hole first annular mounting groove, the second exhaust hole is seted up on the lateral wall of takeover on the first, first feed liquor hole is seted up on the pore wall of second step hole.

6. The integrated layered water-finding and production tubing string of claim 5,

the lower part outer wall of first ladder cover the lower extreme outer wall of first sliding sleeve it is first to go up the takeover and be located the inner wall of second exhaust hole top part it is first to go up the takeover and be located the second exhaust hole with the inner wall of part between the first annular mounting groove the lower part pore wall of second shoulder hole and first sealing ring groove has been seted up respectively to the lower extreme outer wall of inlayer pipe, every first sealing ring is established to the cover respectively in the first sealing ring groove.

7. The integrated layered water exploration and production tubing string of claim 2,

a first limiting step with a reduced inner diameter is formed upwards on the inner wall of the upper end of the outer layer pipe, and a second limiting step with a reduced inner diameter is formed downwards on the inner wall of the lower end of the outer layer pipe; two ends of the inner-layer pipe respectively abut against the first limiting step and the second limiting step, and at least one part of the upper end surface of the first sliding sleeve abuts against the first limiting step.

8. The integrated layered water-finding and production tubing string of claim 1,

the second hydraulic control water detection switch comprises a second outer pipe which is vertically arranged, a second annular mounting groove is formed in the inner wall of the second outer pipe, a second sliding sleeve is sleeved in the second outer pipe, a second step sleeve with the outer diameter expanded is formed at the upper part of the second sliding sleeve in an upward mode, and a second step part is formed at the outer side of the bottom of the second step sleeve;

the second step sleeve is embedded in the second annular mounting groove in a sealing mode and can move in the second annular mounting groove along the axial direction of the second outer pipe, a certain second moving distance is reserved between the second step part and the lower side groove wall of the second annular mounting groove, and the lower outer wall of the second sliding sleeve is in sealing contact with the inner wall of the second outer pipe; and a plurality of second liquid inlet holes are formed in the pipe wall of the second outer pipe at intervals along the circumferential direction of the second step sleeve, and the second outer pipe and the second sliding sleeve are fixed through second shear pins.

9. The integrated layered water-finding and production tubing string of claim 8,

and a second sieve pipe is fixedly sleeved on the outer side of the upper part of the second outer pipe and corresponds to the position of the second liquid inlet hole.

10. The integrated layered water-finding and production tubing string of claim 9,

the second sieve tube comprises a tube body, a plurality of through holes are formed in the side wall of the tube body, the upper end of the tube body is fixedly connected with the second outer tube, and the inner wall of the lower end of the tube body is tightly attached to the outer wall of the second outer tube;

the inner diameter of the middle of the pipe body is larger than the outer diameter of the second outer pipe, an annular transition space is formed between the inner wall of the middle of the pipe body and the outer wall of the second outer pipe, and the through hole and the second liquid inlet hole are communicated with the annular transition space.

11. The integrated layered water-finding and production tubing string of claim 9,

the outer wall of the lower end of the second sliding sleeve is provided with a first annular clamping groove, a clamping ring is embedded in the first annular clamping groove, the inner wall of the lower end of the second outer pipe is located below the first sliding sleeve, a second annular clamping groove is formed in the lower end of the second outer pipe, and the clamping ring can be clamped in the second annular clamping groove.

12. The integrated zonal water-finding and production tubing string of claim 11,

the clamping ring is an annular iron ring, and a longitudinal notch is formed in the side wall of the iron ring.

13. The integrated zonal water-finding and production tubing string of claim 11,

and a third exhaust hole is formed in the part, corresponding to the lower part of the second stepped sleeve, of the pipe wall of the second outer pipe, of the second sliding sleeve, and the third exhaust hole is communicated with an annular space formed by the second moving distance.

14. The integrated layered water exploration and production string of claim 13,

the second outer pipe comprises a second upper connecting pipe, a middle connecting pipe and a second lower connecting pipe which are sequentially fixed from top to bottom, the inner diameter of the middle connecting pipe is smaller than that of the second upper connecting pipe and that of the second lower connecting pipe, and a second annular mounting groove is formed among the lower end face of the second upper connecting pipe, the inner wall of the middle connecting pipe and the upper end face of the second lower connecting pipe;

the upper end of the second sieve tube is fixed with the second upper connecting tube, the second liquid inlet hole and the third exhaust hole are formed in the tube wall of the middle connecting tube, and the second annular clamping groove is formed in the inner wall of the second lower connecting tube.

15. The integrated zonal water-finding and production tubing string of claim 14,

the lower extreme outer wall of takeover on the second the upper end inner wall of second sliding sleeve just is located the top in second feed liquor hole and the lower extreme outer wall of second sliding sleeve just is located the second seal ring groove has been seted up respectively to the top of snap ring, every the second sealing washer is established to the cover respectively in the second seal ring groove.

16. The integrated layered water-finding and production tubing string of claim 8,

the shearing pressure of the second shear pin is greater than the shearing pressure of the first shear pin.

17. The integrated layered water-finding and production tubing string of claim 1,

and an anti-corrosion short joint is also connected between the first packer and the first hydraulic control water finding switch and between the second packer and the second hydraulic control water finding switch respectively.

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