CN108386160A - The deblocking type sand control pipe structure of screen casing under energy flushing pump - Google Patents

Abstract

The present invention be it is a kind of can under flushing pump screen casing deblocking type sand control pipe structure, including flushing valve, the outer wall bottom of flushing valve be arranged with the first packer, and the lower inside of flushing valve can be connected to the lower screen casing of setting pump, pump the lower section that lower screen casing is set to the first packer；It is provided with ball-and-seat below the lower screen casing of pump, the lower seal connection setting bottom screen casing of ball-and-seat, the outer wall top of bottom screen casing is arranged with the second packer, flushing fluid injection channel is provided on flushing valve, the flushing fluid that being provided on flushing valve allows flushing fluid screen casing flushing space under pumping to flow to oil well pump returns row channel, and the output object channel for allowing output gas-liquid to flow into oil well pump from bottom to top is additionally provided on flushing valve.The deblocking type sand control pipe structure can realize that screen casing rinses from inside to outside in the case of screen casing under not playing out pump, and plugging removal effect is good, and well-flushing liquid energy returns out ground, avoids the pollution on stratum, has saved a large amount of operating costs, ensure that the normal production of the oil well.

Description

The deblocking type sand control pipe structure of screen casing under energy flushing pump

Technical field

The present invention relates to a kind of deblocking type sand control pipes of screen casing under oil-gas mining technical field more particularly to energy flushing pump Structure.

Background technology

Current sand control pipe is substantially screen sand control tubing string two under bottom sand control pipe (being fixed using hanger) and pump Grade sand control.

Bottom sand control pipe plays the role of main sand control, which hangs on casing or naked using hanger On the inner wall of eye well, it is normally at Reservoir Section or Reservoir Section top, is set with specific reference to sand production situation, the condition of production Fixed, production fluid carries part little particle reservoir sand and enters screen casing, and part larger particles reservoir sand is stopped by screen casing, is settled down to oil well Bottom in long-time production process, be easy to cause Reservoir Section blocking.

The lower screen sand control tubing string of pump is located at the lower section of oil well pump, is connected to oil pumping pump seal, it is solid not need hanger generally It is fixed, it is smaller due to pumping lower screen casing sand block grain size in sand control process, in serious, water flooding high salinity, the shale content height that shakes out In equal wells, it be easy to cause the lower screen casing of pump and blocks, under pump when not playing out screen casing at present there are mainly two types of screen casing backwashing manners：

First, flushing fluid is squeezed into from oil jacket annular space (annular space i.e. between oil pipe and casing), screen casing has been rinsed from the outside to the core Afterwards, ground is returned out along oil pipe.And due in production process in-place oil be also to be blocked outside screen casing by entering outside screen casing in screen casing Than more serious, so the screen casing rinses de-plugging mode, i.e. flushing fluid rinses screen casing from screen casing extroversion screen casing, and flushing effect is not It is good.

Second is that flushing fluid is squeezed into from oil jacket annular space, enter inside screen casing through perforated pipe or other devices, to screen casing into The flushing of row from-inner-to-outer, flushing fluid can not return ground.The screen casing backwashing manner flushing fluid enters stratum, does not return out ground, easily Cause reservoir pollution.

Cleaning blocking is carried out in addition it can act screen casing, but the cleaning way operating cost is expensive, and the activity duration It is longer, it influences to produce, is unfavorable for promoting the use of.

The present inventor relies on as a result, is engaged in experience and the practice of relevant industries for many years, propose it is a kind of can screen casing under flushing pump Deblocking type sand control pipe structure, to overcome the deficiencies of existing technologies.

Invention content

The purpose of the present invention is to provide a kind of deblocking type sand control pipe structures of screen casing under energy flushing pump, overcome existing skill Reservoir Section present in art easily blocks, flushing effect is poor from the outside to the core, the row of returning is not easy to pollute and the lower screen casing of pump rises for detergent remover for screen casing Go out the problems such as developing cost is high, which can realize screen casing in the case of screen casing under not playing out pump It rinses outward, plugging removal effect is good, and well-flushing liquid energy returns out ground, avoids the pollution on stratum, has saved a large amount of operating costs, ensures The normal production of the oil well.

The object of the present invention is achieved like this, it is a kind of can under flushing pump screen casing deblocking type sand control pipe structure, it is described The deblocking type sand control pipe structure of screen casing includes the flushing valve that top is connect with the sealed bottom of oil well pump under energy flushing pump, described The outer wall sealed bottom of flushing valve is arranged with the first packer that can fix the flushing valve, the lower inside energy of the flushing valve Sealing, which is communicatively equipped with, pumps lower screen casing, and the saturating gap of the lower screen casing overcurrent of pump, institute is arranged on the sealed bottom of screen casing and side wall under the pump State the lower section that the lower screen casing of pump is set to first packer axially spacedly；Permission is provided under the pump below screen casing The ball-and-seat that output gas-liquid flows from bottom to top, the ball-and-seat are set to the lower section of screen casing under the pump axially spacedly, The lower seal connection of the ball-and-seat is equipped with bottom screen casing, and setting bottom is sieved on the sealed bottom and side wall of the bottom screen casing The saturating gap of pipe overcurrent, the outer wall top of the bottom screen casing are arranged with the second packer that can fix the bottom screen casing, and described Screen casing under pump that is closed and being connected to the inner cavity of screen casing under the pump is constituted between one packer and second packer Space is rinsed, being provided on the flushing valve allows annular space of the flushing fluid from above first packer to flow inward into the pump The flushing fluid injection channel of lower screen casing, being provided on the flushing valve, which allows flushing fluid to rinse space from screen casing under the pump, flows to Oil well pump and the flushing fluid that setting is isolated with the flushing fluid injection channel return row channel, are additionally provided on the flushing valve fair Perhaps output gas-liquid flows into the output object channel of oil well pump from bottom to top.

In the better embodiment of the present invention, the bottom screen casing is located on the outer wall below second packer Sealing shroud is equipped with sand sediment pipe, and the sand setting bottom of the tube is outer in sealed set and the inner wall of the sand sediment pipe and the bottom screen casing Wall is radially spaced setting, and the sand sediment pipe overcurrent that the side wall of the sand sediment pipe flows into from the outside to the core equipped with permission output gas-liquid is saturating Gap.

In the better embodiment of the present invention, the flushing valve includes cylinder sleeve structure, the top of the cylinder sleeve structure It can be communicatively sealedly attached to the bottom of oil well pump, the bottom energy sealing shroud of the cylinder sleeve structure is set to first packer Interior, the cylinder sleeve structure interior energy is slidably arranged with the sliding inner tube of top end surface closing setting, and the sliding inner tube is interior along axis To the sliding inner tube centre bore equipped with bottom opening, the inside of the cylinder sleeve structure is located at the lower section fixing sleeve of the sliding inner tube Equipped with extending downwardly the connection inner tube for being pierced by the cylinder sleeve structure, in the connection inner tube setting axially through connection inner tube in The bottom in heart hole, the connection inner tube can communicatively be tightly connected screen casing under the pump.

In the better embodiment of the present invention, the outer wall of the sliding inner tube and the inner wall of the cylinder sleeve structure are in diameter It is arranged to interval, the top of the sliding inner tube is equipped with increased first projecting ring section of diameter, the outer wall bottom of the sliding inner tube With first projecting ring section in being positioned apart from increased second projecting ring section of diameter up and down, the outer wall of first projecting ring section and The outer wall of second projecting ring section slides against setting with the inner wall of the cylinder sleeve structure in sealing, and the sliding inner tube is located at The sliding inner tube side open-work radially penetrated through, the sliding inner tube are provided between first projecting ring section and second projecting ring section Top setting diameter in the first convex pillar part for reducing setting, on first convex pillar part, top plate portion is set, the top plate portion Outer diameter is less than the outer diameter of first convex pillar part, and radially penetrating through setting on the side wall of first convex pillar part can be connected to First pillar side open-work of the inner cavity of the sliding inner tube centre bore and the cylinder sleeve structure；

The upper inside wall of the cylinder sleeve structure is located at the setting internal diameter of the position above first projecting ring section and is arranged in reduction First step portion, the top surface of the first step portion and first projecting ring section is arranged in interval up and down, the sliding inner tube Outer wall above first projecting ring section can be located at the inner wall sealing above the first step portion along the cylinder sleeve structure Sliding, the inner wall that the outer wall of first convex pillar part is located at the cylinder sleeve structure above the first step portion are radially spaced Setting；Positioned at the top in first step portion setting internal diameter in the first inner ring for reducing setting on the inner wall of the cylinder sleeve structure Portion, the top plate portion, which can slide, to be arranged in first internal ring portion, and the top surface of first convex pillar part, which can seal, is resisted against institute State the uplink limiting section that the sliding inner tube is constituted on the bottom surface of the first internal ring portion；The first step portion, the cylinder sleeve structure Inner wall, it is described sliding inner tube outer wall and the top surface of first projecting ring section between constitute reseting cavity, the reset cavity inner sleeve Equipped with resetting spring；

Position on the inner wall of the cylinder sleeve structure and between first projecting ring section and second projecting ring section is solid Surely be provided with the second internal ring portion, the sliding inner tube can seal slidably wear it is convex by second internal ring portion, described first Structure between the bottom surface of ring portion, the inner wall of the cylinder sleeve structure, the outer wall and the top surface of second internal ring portion for sliding inner tube At flushing fluid admission chamber, radially perforation is provided with first be connected to the flushing fluid admission chamber on the side wall of the cylinder sleeve structure Flushing fluid entrance structure, the position that second internal ring portion is located on the side wall of the cylinder sleeve structure radially penetrate through setting second and wash Well liquid entrance structure, radially perforation setting can be connected to the second flushing fluid entrance structure on the side wall of second internal ring portion Internal ring portion side open-work, sliding inner tube side open-work, which can slide, moves up the connection internal ring portion side open-work and sliding inner tube Centre bore；

Axially disposed cylinder sleeve side wall channels closed at both ends, the side of the cylinder sleeve structure in the side wall of the cylinder sleeve structure Positioned at the top of first internal ring portion, setting can be connected to the inner cavity of the cylinder sleeve side wall channels and the cylinder sleeve structure on wall First intercommunicating pore, the lower section setting of second internal ring portion is located on the side wall of the cylinder sleeve structure can be connected to the cylinder sleeve side wall Second intercommunicating pore in channel and the inner cavity of the cylinder sleeve structure, first intercommunicating pore, the cylinder sleeve side wall channels and described Two intercommunicating pores are in circumferential stagger setting with the first flushing fluid entrance structure, the second flushing fluid entrance structure；

The outer diameter of the connection inner tube is less than the lower inner diameter size of the cylinder sleeve structure, described to connect the outer of inner tube Wall upper edge is provided at circumferentially spaced at least two outer diameters in the boss structure for increasing setting, the outer wall sealing of each boss structure It is sheathed on the inner wall of the cylinder sleeve structure, between the inner wall of the cylinder sleeve structure and the side wall of the two neighboring boss structure It constitutes flushing fluid and returns the straight passageway of row, the inner cavity bottom end of the cylinder sleeve structure, the bottom surface of each boss structure, the cylinder sleeve structure Inner wall and the outer wall of the connection inner tube between constitute flushing fluid and return row's entrance space, the flushing fluid returns row's entrance space Bottom rinses space with screen casing under the pump and is connected to setting；The second pillar of outer diameter reduction is provided at the top of the connection inner tube Portion constitutes second step portion, the second step portion between the bottom of second convex pillar part and the outer wall of the connection inner tube Sealing is resisted against the downlink limiting section that the sliding inner tube is constituted on the bottom surface of the sliding inner tube；The inner wall of the sliding inner tube Lower part can seal sliding sleeve set on second convex pillar part outer wall on, second intercommunicating pore be located at second internal ring portion with Between the second step portion, the bottom surface of second projecting ring section, the sliding bottom surface of inner tube, the cylinder sleeve structure it is interior Flushing fluid is constituted between wall, the outer wall of second convex pillar part, the outer wall and the top surface of the boss structure for connecting inner tube The row's of returning spatial transition, second intercommunicating pore can be connected to the flushing fluid and return row's spatial transition and the cylinder sleeve side wall channels；

The connection inner tube centre bore, the sliding inner tube centre bore, first pillar side open-work and described first convex The inner cavity of cylinder sleeve structure above the open-work of column side, which can be connected to, constitutes output object channel；It is the second flushing fluid entrance structure, described Internal ring portion side open-work, the sliding inner tube side open-work and the sliding inner tube centre bore, which can be connected to constitute the flushing fluid and inject, to be led to Road, the flushing fluid return row entrance space, the flushing fluid return the straight passageway of row, the flushing fluid returns row's spatial transition, described the The inner cavity of cylinder sleeve structure above two intercommunicating pores, the cylinder sleeve side wall channels, first intercommunicating pore and first intercommunicating pore The composition flushing fluid can be connected to and return row channel.

In the better embodiment of the present invention, the cylinder sleeve structure, which includes top, can communicatively be sealedly attached to oil pumping First top connection of the bottom of pump, first top connection be internally provided with axially through the first top connection endoporus, described The bottom surface of setting first internal ring portion in one top connection endoporus, first top connection constitutes the first step portion, described The outer wall sealed bottom fixation of first top connection is arranged the fluid cylinder set for extending downwardly setting, and the side wall of first top connection is upper First intercommunicating pore is set in the top of first internal ring portion, is provided on the outer wall of first top connection from described the One intercommunicating pore extends downwardly the first top connection side groove of setting, is provided with from top down and extends on the outer wall of the fluid cylinder set The fluid cylinder of setting covers side groove, and the bottom of the fluid cylinder set side groove is arranged in closing, the fluid cylinder set side groove and described the One top connection side groove is arranged in connection, and third liquid is arranged in the lower section that second internal ring portion is located on the side wall of the fluid cylinder set Cylinder sleeve side open-work, fluid cylinder set side groove and third fluid cylinder set side open-work in being connected to setting, first top connection with The outer cover of the fluid cylinder set, which is equipped with, can be coated on first intercommunicating pore, first top connection side groove, the fluid cylinder set Oversheath outside side groove and third fluid cylinder set side open-work, first top connection side groove, fluid cylinder set side are recessed The cylinder sleeve side wall channels are constituted between slot and the inner wall of the oversheath；

Position fixation of the fluid cylinder set positioned at first projecting ring section and second projecting ring section between is arranged described the Two internal ring portions, axially spaced-apart is arranged that the first fluid cylinder covers side open-work and the second fluid cylinder covers side open-work, institute on the side wall of fluid cylinder set State the first oversheath side open-work for being provided on the side wall of oversheath and being connected to first fluid cylinder set side open-work, the oversheath Side wall on be additionally provided with and the second oversheath side open-work for be connected to of second fluid cylinder set side open-work, the first fluid cylinder set side Open-work is connected to first oversheath side open-work constitutes the first flushing fluid entrance structure, and second fluid cylinder covers side open-work It is connected to second oversheath side open-work and constitutes the second flushing fluid entrance structure, the fluid cylinder set side groove and described the It is in circumferential stagger setting that one fluid cylinder, which covers side open-work and second fluid cylinder set side open-work,；

The lower inside fixing sleeve of the fluid cylinder set is equipped with the transition inner tube for extending downwardly and being pierced by the fluid cylinder set, the mistake The top surface for crossing inner tube and the bottom surface contact of second internal ring portion are arranged, and the internal diameter size of the transition inner tube is more than the connection The outer wall sealing shroud of the outer diameter of inner tube, each boss structure is set on the inner wall of the transition inner tube, and described second is convex The inner wall of the outer wall of ring portion and the transition inner tube slides against setting in sealing, with described the on the side wall of the transition inner tube Transition inner tube side open-work is communicatively arranged in three fluid cylinders set side open-work, and the third fluid cylinder set side open-work and transition inner tube side are saturating Constitute second intercommunicating pore hole communicating pipe, the outer wall lower part fixing sleeve of the transition inner tube be equipped with inner hollow first under connect The outer wall sealed bottom of head, first lower contact is sheathed in first packer, the inner wall of first lower contact with Radially interval setting between the outer wall of the connection inner tube；

The outer wall bottom fixing sleeve of the connection inner tube is equipped with the second lower contact, the inside bottom energy of second lower contact Communicatively it is tightly connected screen casing under the pump.

In the better embodiment of the present invention, the outer diameter of the internal diameter size and the top plate portion of first internal ring portion Size is in identical setting, and the outer wall of the top plate portion, which can seal, to be slid against on the inner wall of first internal ring portion.

In the better embodiment of the present invention, the ball-and-seat includes the ball-and-seat outer tube structure being coaxially arranged and list Valve inner tube is flowed, the ball-and-seat inner tube can slide axially along the ball-and-seat outer tube structure, the top of the ball-and-seat outer tube structure Ball-and-seat ball valve seat is arranged in portion, and contact setting ball sealer, the ball-and-seat outer tube structure can be sealed on the ball-and-seat ball valve seat Top upwardly extend and be provided with overcurrent head, the ball-and-seat that setting allows gas-liquid output object to flow out on the side wall of the overcurrent head produces Go out object via, the ball-and-seat outer tube structure is located at setting on the side wall of the lower section of the ball-and-seat ball valve seat can be with single stream The ball-and-seat flushing fluid via of the inner cavity connection of valve inner tube, the ball-and-seat outer tube structure are located at the ball-and-seat flushing fluid via Lower section sealing shroud be set to the bottom screen casing inside upper part.

In the better embodiment of the present invention, the ball-and-seat is the ball-and-seat that can be salvaged, the top of the overcurrent head Portion, which upwardly extends, is provided with fishing head.

In the better embodiment of the present invention, the fishing head includes being beaten from what the overcurrent overhead upwardly extended Bar is dragged for, conehead, the bottom-up tapered setting of diameter for salvaging conehead are salvaged in the top setting of the fishing rod.

In the better embodiment of the present invention, the ball-and-seat outer tube structure includes ball-and-seat outer tube, the list The inner wall of the outer wall and the ball-and-seat outer tube that flow valve inner tube is radially spaced setting, the inner wall top of the ball-and-seat outer tube Portion is fixedly connected with the second top connection of inner hollow, and the inner wall bottom of the ball-and-seat outer tube is fixedly connected with the of inner hollow Three lower contacts, the outer wall of the ball-and-seat inner tube can slidably be resisted against the interior of second top connection and the third lower contact On wall, ball-and-seat inner tube sliding stroke chamber is constituted between the bottom surface of second top connection and the top surface of the third lower contact, Ball-and-seat projecting ring section is arranged on the outer wall of the ball-and-seat inner tube, the outer wall of the ball-and-seat projecting ring section can be slidably resisted against On the inner wall of the ball-and-seat outer tube, the top surface of the ball-and-seat projecting ring section can be with the bottom surface contact card of second top connection Only, it is provided with ball-and-seat spring between the bottom surface of the ball-and-seat projecting ring section and the top surface of the third lower contact；Described second Third internal ring portion is set in top connection, and the third internal ring portion constitutes the ball-and-seat ball valve seat, position in second top connection Third stage portion is set in the lower section of the third internal ring portion, second top connection is located at the side below the third stage portion The ball-and-seat flushing fluid via is set on wall, is upwardly extended at the top of the ball-and-seat inner tube and is provided with diameter in reduction setting Third pillar, radially interval setting between the outer wall of the third pillar and the inner wall of second top connection, described the The top surface of three pillars can be resisted against in the third stage portion, the outer wall of the bottom of the third pillar and the ball-and-seat inner tube Between constitute the 4th stage portion；The third stage portion, the inner wall of second top connection, the outer wall of the third pillar and institute Composition ball-and-seat flushing fluid is filled with chamber between stating the 4th stage portion.

In the better embodiment of the present invention, second top connection is located at the ball-and-seat flushing fluid via Outer diameter is located in setting, second top connection is increased on the outer wall and described second at the ball-and-seat flushing fluid via Connector is located at the 5th stage portion of composition, the 5th stage portion energy contact between the outer wall below the ball-and-seat flushing fluid via In on the top surface of second packer.

In the better embodiment of the present invention, the circumferential width size of the saturating gap of sand sediment pipe overcurrent is more than the bottom The circumferential width size of the saturating gap of portion's screen casing overcurrent, the circumferential width size of the saturating gap of bottom screen casing overcurrent, which is more than under the pump, sieves The circumferential width size of the saturating gap of pipe overcurrent.

From the above mentioned, the deblocking type sand control pipe structure of screen casing has following beneficial effect under energy flushing pump provided by the invention Fruit：

(1) under energy flushing pump of the invention in the deblocking type sand control pipe structure of screen casing, flushing valve is both provided with output object Channel meets the mining requirement that output gas-liquid in production process flows to oil well pump from bottom to top, and being additionally provided on flushing valve allows to wash The flushing fluid that well liquid flows into the flushing fluid injection channel of the lower screen casing of pump and is isolated with flushing fluid injection channel from the outside to the core returns To meet the flushing requirement for cleaning to pumping lower screen casing, the lower screen casing of pump is connected and composed integrated knot by flushing valve with oil well pump in row channel The lower screen casing of pump need not be detached with oil well pump when well-flushing, oil pumping need not also be pumped up out to bottom surface, pump lower sieve by structure The flushing direction of pipe is from inside to outside, to flow into the direction of the lower screen casing of pump with output gas-liquid on the contrary, well-flushing plugging removal effect is good, save A large amount of operating costs；Well-flushing liquid energy returns out ground by oil well pump, avoids the pollution on stratum, ensure that the normal life of oil well Production；

(2) under energy flushing pump of the invention in the deblocking type sand control pipe structure of screen casing, bottom screen casing is located at the second packing Outer wall upper sleeve gasket below device is equipped with sand sediment pipe, and sand sediment pipe is used for storing the reservoir sand stopped by bottom screen casing, avoids stratum Sand falls into formation blockage Reservoir Section；

(3) under energy flushing pump of the invention in the deblocking type sand control pipe structure of screen casing, ball-and-seat can ensure flushing pump In lower screen casing operation process, pumping lower screen casing and rinsing space and can build the pressure makes flushing valve work normally, prevent flushing fluid down into Stratum and cannot on return, also can avoid pumping the dirt that lower screen casing stops when well-flushing and fall into the screen casing of bottom, moreover it is possible to well-flushing be avoided to beat Since the equipment such as cementing truck are unstable when pressure, flushing fluid instantaneous pressure cause to build the pressure in well when rising so as to cause underground wind It is dangerous, fishing head is set on ball-and-seat, when needing to carry out other operations of underground, ground can be salvaged.

Description of the drawings

The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein：

Fig. 1：For the deblocking type sand control pipe structure production status schematic diagram of screen casing under the energy flushing pump of the present invention.

Fig. 2：For the deblocking type sand control pipe structure well-flushing status diagram of screen casing under the energy flushing pump of the present invention.

Fig. 3：For the flushing valve production status schematic diagram of the present invention.

Fig. 4：For the flushing valve well-flushing status diagram of the present invention.

Fig. 5：For the structural schematic diagram of the first top connection of the present invention.

Fig. 6：For schematic cross-section at A-A in Fig. 5.

Fig. 7：For schematic cross-section at B-B in Fig. 5.

Fig. 8：For the structural schematic diagram of the connection inner tube of the present invention.

Fig. 9：For schematic cross-section at C-C in Fig. 8.

Figure 10：For the structural schematic diagram of the fluid cylinder set of the present invention.

Figure 11：For schematic cross-section at D-D in Figure 10.

Figure 12：For schematic cross-section at E-E in Figure 10.

Figure 13：For the structural schematic diagram of the ball-and-seat normal condition of the present invention.

Figure 14：For the structural schematic diagram of the ball-and-seat unloading condition of the present invention.

In figure：

100, can under flushing pump screen casing deblocking type sand control pipe structure；

1, flushing valve；

10, cylinder sleeve structure；

101, the first top connection；1010, the first top connection endoporus；1011, first step portion；1012, the first internal ring portion； 1013, the first intercommunicating pore；1014, the first top connection side groove；

102, fluid cylinder set；

1021, the second internal ring portion；10211, internal ring portion side open-work；

1022, the second intercommunicating pore；1023, fluid cylinder covers side groove；1024, third fluid cylinder covers side open-work；1025, the first fluid cylinder Cover side open-work；1026, the second fluid cylinder covers side open-work；

103, oversheath；1031, the first oversheath side open-work；1032, the second oversheath side open-work；

104, transition inner tube；

105, the first lower contact；

11, inner tube is slided；

110, inner tube centre bore is slided；

111, the first projecting ring section；

112, the second projecting ring section；

113, sliding inner tube side open-work；

114, the first convex pillar part；1141, the first pillar side open-work；

115, top plate portion；

12, inner tube is connected；

120, inner tube centre bore is connected；121, boss structure；122, the second convex pillar part；123, second step portion；

13, the second lower contact；

2, lower screen casing is pumped；201, the lower saturating gap of screen casing overcurrent is pumped；

3, ball-and-seat；

31, ball-and-seat outer tube structure；

311, ball-and-seat ball valve seat；

312, ball sealer；

313, overcurrent head；3131, ball-and-seat output object via；

314, ball-and-seat flushing fluid via；

315, ball-and-seat outer tube；3151, the second top connection；3152, third lower contact；3153, third stage portion； 3154, the 5th stage portion；

32, ball-and-seat inner tube；320, ball-and-seat projecting ring section；321, third pillar；322, the 4th stage portion；

33, fishing head；331, fishing rod；332, conehead is salvaged；

34, ball-and-seat spring；

4, bottom screen casing；401, the saturating gap of bottom screen casing overcurrent；

5, sand sediment pipe；501, the saturating gap of sand sediment pipe overcurrent；

61, the first packer；62, the second packer；

7, resetting spring；

81, flushing fluid injection channel；82, flushing fluid returns row channel；83, output object channel；

9, oil well pump.

Specific implementation mode

For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control illustrates this hair Bright specific implementation mode.

As shown in Fig. 1 to Figure 14, the present invention provide it is a kind of can under flushing pump screen casing deblocking type sand control pipe structure 100, Outer wall sealed bottom including the flushing valve 1 that top is connect with the sealed bottom of oil well pump 9 (prior art), flushing valve 1 is arranged The first packer 61 (the outer wall contact of the first packer 61 is fixed on casing or open hole inner wall) of flushing valve 1 can be fixed by having, Annular space between first packer, 61 sealed spacer flushing valve 1 and internal surface of sleeve pipe (or open hole inner wall), the lower inside of flushing valve 1 It can seal and communicatively be equipped with the lower screen casing 2 of pump, the sealed bottom of screen casing 2 (in the present embodiment, pumps the bottom of lower screen casing 2 under pumping Be sealed by the lower device for plug of sieve tube of pump) and side wall on the saturating gap 201 of the lower screen casing overcurrent of setting pump, it is axially spaced to pump lower screen casing 2 Ground is set to the lower section of the first packer 61；The lower section and the position above Reservoir Section or Reservoir Section for pumping lower screen casing 2 are set It is equipped with the ball-and-seat 3 for allowing output gas-liquid to flow from bottom to top, ball-and-seat 3 is set under pump axially spacedly under screen casing 2 The lower seal connection of side, ball-and-seat 3 is equipped with bottom screen casing 4, sealed bottom (in the present embodiment, the bottom of bottom screen casing 4 The bottom of screen casing 4 is sealed by bottom device for plug of sieve tube) and side wall on be arranged the saturating gap 401 of bottom screen casing overcurrent, bottom screen casing 4 Outer wall top be arranged with and can fix the second packer 62 of bottom screen casing 4 (the outer wall contact of the second packer 62 is fixed on set On pipe or open hole inner wall), inner cavity closed and that screen casing 2 can be descended with pump is constituted between the first packer 61 and the second packer 62 Screen casing rinses space under the pump of connection, and being provided on flushing valve 1 allows annular space of the flushing fluid from above the first packer inwardly to flow Enter the flushing fluid injection channel 81 of the lower screen casing of pump, being provided on flushing valve 1, which allows flushing fluid to rinse space from the lower screen casing of pump, flows to Oil well pump and the flushing fluid that setting is isolated with flushing fluid injection channel 81 return row channel 82, and being additionally provided on flushing valve 1 allows to produce Go out the output object channel 83 that gas-liquid flows into oil well pump from bottom to top.The deblocking type sand control pipe of screen casing under the energy flushing pump of the present invention In structure 100, flushing valve 1 had both been provided with output object channel 83 and meets output gas-liquid in production process flows to oil well pump from bottom to top Mining requirement, the flushing fluid injection channel 81 for allowing flushing fluid to flow into pump time screen casing from the outside to the core is additionally provided on flushing valve 1 And the flushing fluid being isolated with flushing fluid injection channel 81 returns flushing requirement for cleaning of the row channel 82 with satisfaction to screen casing under pumping, The lower screen casing 2 of pump is connected and composed integral structure by flushing valve 1 with oil well pump, when well-flushing, need not will be pumped lower screen casing and be taken out Oil pump detaches, and oil pumping need not also be pumped up out to bottom surface, and the flushing direction for pumping lower screen casing is from inside to outside, to be flowed into output gas-liquid A large amount of operating costs have been saved on the contrary, well-flushing plugging removal effect is good for the direction of the lower screen casing of pump；Well-flushing liquid energy returns out ground by oil well pump Face avoids the pollution on stratum, ensure that the normal production of oil well.

Further, as shown in Figure 1 and Figure 2, the outer wall upper sleeve gasket that bottom screen casing 4 is located at below the second packer 62 is equipped with The top of sand sediment pipe 5, sand sediment pipe 5 is threadingly attached on the outer wall of bottom screen casing 4,5 bottom of sand sediment pipe in sealed set and The inner wall of sand sediment pipe 5 is radially spaced setting with the outer wall of bottom screen casing 4, and the side wall of sand sediment pipe 5, which is equipped with, allows output gas-liquid The saturating gap of the sand sediment pipe overcurrent that flows into from the outside to the core 501.In the present embodiment, the bottom of sand sediment pipe 5 by sand sediment pipe silk plug into Row sealing.Bottom screen casing 4 plays the role of primary sand control, and position is set according to sand production situation, the condition of production；Sand setting Pipe 5 is used for storing the reservoir sand stopped by bottom screen casing 4, and reservoir sand is avoided to fall into formation blockage Reservoir Section；The length of sand sediment pipe 5 Determine that, if screen casing 4 position in bottom is located at Reservoir Section, sand sediment pipe 5 can not according to sand production amount and 4 hanging position of bottom screen casing With.Sand sediment pipe 5 can also use the structure of side wall upper part slot.

In the present embodiment, (or the sealing of top slot is wide for the circumferential width size of the saturating gap of sand sediment pipe overcurrent 501 Degree) it is more than the circumferential width size of the saturating gap of bottom screen casing overcurrent 401, the circumferential width size of the saturating gap of bottom screen casing overcurrent 401 is big In the circumferential width size of the saturating gap of the lower screen casing overcurrent of pump 201.In production process, in the reservoir sand carried in output gas-liquid, sand setting Bulky grain sand is barred from outside sand sediment pipe 5 by pipe 5, avoids it with being returned in output gas-liquid, bottom screen casing 4 will enter in sand sediment pipe 5 Larger particles sand is barred from outside bottom screen casing 4 in output gas-liquid, and larger particles sand sinks to dropping down onto the intracavity bottom of sand sediment pipe 5, pump Lower screen casing 2 will be barred from pump into smaller particle sand in the output gas-liquid of annular space between the first packer 61 and the second packer 62 Outside lower screen casing 2, the further desanding of output gas-liquid is filtered.

Further, as shown in Figure 3, Figure 4, flushing valve 1 includes cylinder sleeve structure 10, and the top of cylinder sleeve structure 10 can be communicatively close Envelope is connected to the bottom of oil well pump 9, and the bottom energy sealing shroud of cylinder sleeve structure 10 is set in the first packer 61, in cylinder sleeve structure 10 It can be slidably arranged with the sliding inner tube 11 of top end surface closing setting, slide the cunning for being equipped with bottom opening in inner tube 11 in an axial direction Dynamic inner tube centre bore 110, the inside of cylinder sleeve structure 10 is equipped with to extend downwardly positioned at the lower section fixing sleeve of sliding inner tube 11 is pierced by cylinder The connection inner tube 12 of nested structure 10, in connection inner tube 12 setting axially through connection inner tube centre bore 120, connection inner tube 12 Bottom can communicatively be tightly connected screen casing 2 under pump.

Further, as shown in Figure 3, Figure 4, the outer wall of sliding inner tube 11 and the inner wall of cylinder sleeve structure 10 are radially spaced and set It sets, the top of sliding inner tube 11 is equipped with increased first projecting ring section 111 of diameter, slides outer wall bottom and the first bulge loop of inner tube 11 Portion 111 is in be positioned apart from increased second projecting ring section 112 of diameter, the outer wall and the second bulge loop of the first projecting ring section 111 up and down The outer wall in portion 112 slides against setting with the inner wall of cylinder sleeve structure 10 in sealing, and sliding inner tube 11 is located at the first projecting ring section 111 And second be provided with the sliding inner tube side open-work 113 radially penetrated through between projecting ring section 112, diameter is arranged in the top of sliding inner tube 11 In the first convex pillar part 114 for reducing setting, top plate portion 115 is set on the first convex pillar part 114, the outer diameter of top plate portion 115 is small In radially perforation setting can be connected to tube hub in sliding on the outer diameter of the first convex pillar part 114, the side wall of the first convex pillar part 114 The first pillar side open-work 1141 in hole 110 and the inner cavity of cylinder sleeve structure 10；

The upper inside wall of cylinder sleeve structure 10 is located at the position setting internal diameter of the top of the first projecting ring section 111 in reducing the of setting The top surface of one stage portion 1011, first step portion 1011 and the first projecting ring section 111 is arranged in interval up and down, and sliding inner tube 11 is located at The outer wall of first projecting ring section, 111 top can be located at the sliding of the inner wall sealing above first step portion 1011 along cylinder sleeve structure 10, the The inner wall that the outer wall of one convex pillar part 114 is located at 1011 top of first step portion with cylinder sleeve structure 10 is radially spaced setting；Cylinder sleeve Positioned at the top in first step portion 1011 setting internal diameter in the first internal ring portion 1012 for reducing setting, top plate on the inner wall of structure 10 Portion 115, which can slide, to be arranged in the first internal ring portion 1012, and the top surface of the first convex pillar part 114, which can seal, is resisted against the first internal ring portion The uplink limiting section of sliding inner tube is constituted on 1012 bottom surface；First step portion 1011, the inner wall of cylinder sleeve structure 10, sliding inner tube Reseting cavity is constituted between 11 outer wall and the top surface of the first projecting ring section 111, is resetted cavity inner sleeve and is equipped with resetting spring 7；

Position on the inner wall of cylinder sleeve structure 10 and between the first projecting ring section 111 and the second projecting ring section 112, which is fixed, to be set It is equipped with the second internal ring portion 1021, sliding inner tube 11, which can seal, slidably to be worn through the second internal ring portion 1021, the first projecting ring section 111 Bottom surface, cylinder sleeve structure 10 inner wall, slide inner tube 11 outer wall and the top surface of the second internal ring portion 1021 between constitute flushing fluid Admission chamber, radially perforation is provided with the first flushing fluid entrance knot being connected to flushing fluid admission chamber on the side wall of cylinder sleeve structure 10 Structure, the position that the second internal ring portion 1021 is located on the side wall of cylinder sleeve structure 10 radially penetrate through the second flushing fluid entrance structure of setting, The internal ring portion side open-work that radially perforation setting can be connected to the second flushing fluid entrance structure on the side wall of second internal ring portion 1021 10211, sliding inner tube side open-work 113, which can slide, moves up connection internal ring portion side open-work 10211 and sliding inner tube centre bore 110；

Axially disposed cylinder sleeve side wall channels closed at both ends in the side wall of cylinder sleeve structure 10, on the side wall of cylinder sleeve structure 10 Positioned at the top of the first internal ring portion 1012, setting can be connected to the first intercommunicating pore of the inner cavity of cylinder sleeve side wall channels and cylinder sleeve structure 10 1013, the lower section setting of the second internal ring portion 1021 is located on the side wall of cylinder sleeve structure 10 can be connected to cylinder sleeve side wall channels and cylinder sleeve knot Second intercommunicating pore 1022 of the inner cavity of structure, the first intercommunicating pore 1013, cylinder sleeve side wall channels and the second intercommunicating pore 1022 are washed with first Well liquid entrance structure, the second flushing fluid entrance structure are in circumferential stagger setting；In the specific embodiment of the present invention, first connects The quantity of through-hole 1013, cylinder sleeve side wall channels and the second intercommunicating pore 1022 is 2.

The outer diameter for connecting inner tube 12 is less than the lower inner diameter size of cylinder sleeve structure 10, connects the outer wall upper edge of inner tube 12 At least two outer diameters are provided at circumferentially spaced in the boss structure 121 for increasing setting, the outer wall sealing of each boss structure 121 is arranged In on the inner wall of cylinder sleeve structure 10, well-flushing is constituted between the inner wall of cylinder sleeve structure 10 and the side wall of two neighboring boss structure 121 Liquid returns the straight passageway of row, and in the specific embodiment of the present invention, the quantity of boss structure 121 is 3, is formed with 3 well-flushings Liquid returns the straight passageway of row；The inner cavity bottom end of cylinder sleeve structure 10, the bottom surface of each boss structure 121, the inner wall of cylinder sleeve structure 10 and connection Flushing fluid is constituted between the outer wall of inner tube 12 and returns row's entrance space, and flushing fluid returns the bottom of row's entrance space and the lower screen casing of pump rinses Space connection setting；The top of connection inner tube 12 is provided with the second convex pillar part 122 of outer diameter reduction, the bottom of the second convex pillar part 122 Second step portion 123 is constituted between portion and the outer wall for connecting inner tube, second step portion 123 seals the bottom for being resisted against sliding inner tube 11 The downlink limiting section of sliding inner tube is constituted on face；The inner wall lower of sliding inner tube 11 can seal sliding sleeve and be set to the second convex pillar part On 122 outer wall, the second intercommunicating pore 1022 is between the second internal ring portion 1021 and second step portion 123, the second projecting ring section 112 Bottom surface, sliding the bottom surface of inner tube 11, the inner wall of cylinder sleeve structure 10, the second convex pillar part 122 outer wall, connect inner tube 12 outer wall Flushing fluid is constituted between the top surface of boss structure 121 and returns row's spatial transition, and the second intercommunicating pore 1022 can be connected to flushing fluid and return row Spatial transition and cylinder sleeve side wall channels；

It is saturating to connect inner tube centre bore 120, sliding inner tube centre bore 110, the first pillar side open-work 1141 and the first pillar side The inner cavity of the cylinder sleeve structure 10 of 1141 top of hole, which can be connected to, constitutes output object channel 83；Second flushing fluid entrance structure, internal ring portion Side open-work 10211, sliding inner tube side open-work 113 can be connected to sliding inner tube centre bore 110 and constitute flushing fluid injection channel 81, wash Well liquid returns row's entrance space, flushing fluid returns the straight passageway of row, flushing fluid returns row's spatial transition, the second intercommunicating pore 1022, cylinder sleeve side wall The inner cavity of the cylinder sleeve structure 10 of 1013 top of channel, the first intercommunicating pore 1013 and the first intercommunicating pore can be connected to composition flushing fluid and return row Channel 82.

Under energy flushing pump in the deblocking type sand control pipe structure 100 of screen casing, the working condition of flushing valve 1 includes production status With well-flushing state；

As shown in figure 3, the bottom surface of sliding inner tube 11 is resisted against in second step portion 123, flushing valve 1 is located at production status, Second projecting ring section, 112 the second intercommunicating pore of sealed spacer 1022 and flushing fluid return the straight passageway of row, sliding inner tube side open-work 113 and inner ring Portion side open-work 10211 is axially offset, connection inner tube centre bore 120, sliding inner tube centre bore 110, the first pillar side open-work 1141 It is connected to the inner cavity of the cylinder sleeve structure 10 of 1141 top of the first pillar side open-work and constitutes output object channel 83；

As shown in figure 4, the top surface sealing for moving to the first convex pillar part 114 in sliding inner tube 11 is resisted against the first internal ring portion 1012 Bottom surface on, flushing valve 1 is located at well-flushing state, slides the cylinder sleeve of 1141 top of inner tube centre bore 110 and the first pillar side open-work The inner cavity of structure 10 is mutually isolated, and sliding inner tube side open-work 113 is in be connected to setting, the second well-flushing with internal ring portion side open-work 10211 Liquid entrance structure, internal ring portion side open-work 10211, sliding inner tube side open-work 113 are connected to sliding inner tube centre bore 110 and constitute well-flushing Liquid injection channel 81, flushing fluid returns row's entrance space, flushing fluid returns the straight passageway of row, flushing fluid returns row's spatial transition, the second connection Hole 1022, cylinder sleeve side wall channels, the first intercommunicating pore 1013 are connected to the inner cavity of the cylinder sleeve structure 10 of 1013 top of the first intercommunicating pore It constitutes flushing fluid and returns row channel 82.

Further, as shown in Figures 3 to 12, in the specific embodiment of the present invention, cylinder sleeve structure 10 includes top energy Communicatively be sealedly attached to the first top connection 101 of the bottom of oil well pump 9, the first top connection 101 be internally provided with axially through The first top connection endoporus 1010, in the present embodiment, the setting of the top of the first top connection endoporus 1010 for oil well pump 9 The first top connection taper thread portion being tightly connected；Setting the first internal ring portion 1012 above-mentioned in first top connection endoporus 1010, the The bottom surface of one top connection 101 constitutes first step portion 1011 above-mentioned, and the outer wall sealed bottom fixation of the first top connection 101 is arranged The fluid cylinder set 102 of setting is extended downwardly, the top setting that the first internal ring portion 1012 is located on the side wall of the first top connection 101 is aforementioned The first intercommunicating pore 1013, be provided on the outer wall of the first top connection 101 and extend downwardly the of setting from the first intercommunicating pore 1013 One top connection side groove 1014, fluid cylinder set 102 outer wall on be provided with from top down be extended fluid cylinder cover side groove 1023, the bottom that fluid cylinder covers side groove 1023 is arranged in closing, and fluid cylinder covers side groove 1023 and the first top connection side groove 1014 It is arranged in connection, the lower section setting third fluid cylinder that the second internal ring portion 1021 is located on the side wall of fluid cylinder set 102 covers side open-work 1024, Fluid cylinder covers side groove 1023 and third fluid cylinder set side open-work 1024 in be connected to setting, the first top connection 101 and fluid cylinder cover 102 outside Portion, which is arranged with, can be coated on the first intercommunicating pore 1013, the first top connection side groove 1014, fluid cylinder set side groove 1023 and third liquid Oversheath 103 outside cylinder sleeve side open-work 1024, the first top connection side groove 1014, fluid cylinder set side groove 1023 and oversheath Cylinder sleeve side wall channels are constituted between 103 inner wall；

Position of the fluid cylinder set 102 between the first projecting ring section 111 and the second projecting ring section 112, which is fixed, is arranged above-mentioned second Internal ring portion 1021, fluid cylinder set 102 side wall on axially spaced-apart be arranged the first fluid cylinder cover side open-work 1025 and the second fluid cylinder set side it is saturating Hole 1026 is provided with the first oversheath side open-work being connected to the first fluid cylinder set side open-work 1025 on the side wall of oversheath 103 1031, the second oversheath side open-work being connected to the second fluid cylinder set side open-work 1026 is additionally provided on the side wall of oversheath 103 1032, the first fluid cylinder set side open-work 1025 is connected to the first oversheath side open-work 1031 constitutes the first flushing fluid entrance structure, the Two fluid cylinders set side open-work 1026 is connected to the second oversheath side open-work 1032 constitutes the second flushing fluid entrance structure, the second fluid cylinder set The specific location of side open-work 1026 determines that position needs the top surface sealing top for meeting the first convex pillar part 114 according to produce reality When being butted on the bottom surface of the first internal ring portion 1012, the second fluid cylinder set side open-work 1026 is connected to the second oversheath side open-work 1032；Liquid Cylinder sleeve side groove 1023 and the first fluid cylinder set side open-work 1025 and the second fluid cylinder set side open-work 1026 are in circumferential stagger setting；

The lower inside fixing sleeve of fluid cylinder set 102 is equipped with the transition inner tube 104 for extending downwardly and being pierced by fluid cylinder set 102, transition The top surface of inner tube 104 and the bottom surface contact of the second internal ring portion 1021 are arranged, and the internal diameter size of transition inner tube 104 is more than connection inner tube The outer wall sealing shroud of 12 outer diameter, each boss structure 121 is set on the inner wall of transition inner tube 104, the second projecting ring section 112 Outer wall and the inner wall of transition inner tube 104 are in seal to slide against setting, saturating with third fluid cylinder set side on the side wall of transition inner tube 104 Transition inner tube side open-work is communicatively arranged in hole 1024, and third fluid cylinder covers side open-work 1024 and transition inner tube side open-work communicating pipe is constituted Second intercommunicating pore 1022 above-mentioned, third fluid cylinder cover the installation position of side open-work 1024 and transition inner tube side open-work, need to meet When the top surface sealing of first convex pillar part 114 is resisted against the bottom surface of the first internal ring portion 1012, flushing fluid returns row's spatial transition and cylinder sleeve Side wall channels are connected to；The outer wall lower part fixing sleeve of transition inner tube 104 is equipped with the first lower contact 105 of inner hollow, is connect under first First 105 outer wall sealed bottom is sheathed in the first packer 61, in the present embodiment, the outer wall bottom of the first lower contact 105 Portion is provided with the first lower contact taper thread portion for being tightly connected the first packer 61；The inner wall of first lower contact 105 and company Connect radially interval setting between the outer wall of inner tube 12；

The outer wall bottom fixing sleeve for connecting inner tube 12 is equipped with the second lower contact 13, and the inside bottom of the second lower contact 13 can connect It is tightly connected screen casing 2 under pump logically.In the present embodiment, the inside bottom of the second lower contact 13 is provided with for being tightly connected Second lower contact taper thread portion of screen casing 2 under pump.

Further, the internal diameter size of the first internal ring portion 1012 is in identical setting, top plate portion with the outer diameter of top plate portion 115 115 outer wall, which can seal, to be slid against on the inner wall of the first internal ring portion 1012.

Further, shown in as shown in Figure 1, Figure 2, Figure 13, Figure 14, ball-and-seat 3 includes the ball-and-seat outer tube structure 31 being coaxially arranged With ball-and-seat inner tube 32, ball-and-seat inner tube 32 can slide axially along ball-and-seat outer tube structure 31, the top of ball-and-seat outer tube structure 31 Ball-and-seat ball valve seat 311 is arranged in portion, and contact setting ball sealer 312, ball-and-seat outer tube structure can be sealed on ball-and-seat ball valve seat 311 31 top, which upwardly extends, is provided with overcurrent head 313, and the list that setting allows gas-liquid output object to flow out on the side wall of overcurrent head 313 flows Valve output object via 3131, ball-and-seat outer tube structure 31 is located on the side wall of the lower section of ball-and-seat ball valve seat 311 setting can be with list The ball-and-seat flushing fluid via 314 of the inner cavity connection of valve inner tube 32 is flowed, ball-and-seat outer tube structure 31 is located at ball-and-seat flushing fluid mistake The lower section sealing shroud in hole 314 is set to the inside upper part of bottom screen casing 4.

Further, shown in as shown in Figure 1, Figure 2, Figure 13, Figure 14, ball-and-seat 3 is the ball-and-seat that can be salvaged, the top of overcurrent head 313 Portion, which upwardly extends, is provided with fishing head 33.In the present embodiment, fishing head 33 includes being upwardly extended from 313 top of overcurrent head Conehead 332 is salvaged in the top setting of fishing rod 331, fishing rod 331, salvages the bottom-up tapered setting of diameter of conehead 332.

Further, as shown in Figure 13, Figure 14, ball-and-seat outer tube structure 31 includes ball-and-seat outer tube 315, ball-and-seat inner tube 32 outer wall is radially spaced setting with the inner wall of ball-and-seat outer tube 315, and the inner wall top of ball-and-seat outer tube 315 is fixed to be connected The second top connection 3151 of inner hollow is connect, the inner wall bottom of ball-and-seat outer tube 315 is fixedly connected under the third of inner hollow Connector 3152, the outer wall of ball-and-seat inner tube 32 can slidably be resisted against the inner wall of the second top connection 3151 and third lower contact 3152 On, ball-and-seat inner tube sliding stroke chamber is constituted between the bottom surface and the top surface of third lower contact 3152 of the second top connection 3151, it is single It is arranged with ball-and-seat projecting ring section 320 on the outer wall of stream valve inner tube 32, the outer wall of ball-and-seat projecting ring section 320 can slidably be resisted against list On the inner wall for flowing valve outer tube 315, the top surface of ball-and-seat projecting ring section 320 can be engaged with the bottom surface contact of the second top connection 3151, It is provided with ball-and-seat spring 34 between the bottom surface and the top surface of third lower contact 3152 of ball-and-seat projecting ring section 320, in ball-and-seat bullet Under the active force of spring 34, the top surface of ball-and-seat projecting ring section 320 can be engaged with the bottom surface contact of the second top connection 3151；It is connect on second Third internal ring portion is set in first 3151, and third internal ring portion constitutes ball-and-seat ball valve seat 311, is located at third in the second top connection 3151 The lower section setting third stage portion 3153 of internal ring portion, the second top connection 3151, which is located on the side wall of 3153 lower section of third stage portion, to be set Ball-and-seat flushing fluid via 314 above-mentioned is set, the top of ball-and-seat inner tube 32, which upwardly extends, is provided with diameter in reduction setting Third pillar 321, radially interval setting, third are convex between the outer wall of third pillar 321 and the inner wall of the second top connection 3151 The top surface of column 321 can be resisted against in third stage portion 3153, between the bottom and the outer wall of ball-and-seat inner tube 32 of third pillar 321 Constitute the 4th stage portion 322, third stage portion 3153, the inner wall of the second top connection 3151, third pillar 321 outer wall and the 4th Ball-and-seat flushing fluid is constituted between stage portion 322 is filled with chamber.

As shown in figure 13, under normal condition, ball-and-seat flushing fluid via 314 and the inner cavity of ball-and-seat inner tube 32 do not connect mutually Logical, during well-flushing, under the action of ball-and-seat 3, flushing fluid cannot continue flow down from lower screen casing flushing space is pumped；When The equipment such as the cementing truck (prior art) for injecting flushing fluid are unstable, injection pump (prior art) the instant displacement of flushing fluid It is excessive, cause flushing fluid pressure moment in well to increase, when the well-flushing hydraulic coupling that the lower screen casing of pump rinses in space increases to limiting value When (in one embodiment, which is 25MPa), as shown in figure 14, ball-and-seat 3 enters unloading condition, and flushing fluid is through single stream Valve flushing fluid via 314 is filled with chamber into ball-and-seat flushing fluid, and the downward active force of the 4th stage portion 322 of flushing fluid pair is more than single The upward active force of valve spring 34 is flowed, ball-and-seat inner tube 32 moves down, and ball-and-seat flushing fluid via 314 is interior with ball-and-seat inner tube 32 Chamber is connected to, and flushing fluid, which flows downward, realizes off-load, avoids damage of the flushing fluid to ball-and-seat 3.The stream of the flushing fluid of the off-load Amount is smaller, will not cause pollution in well.

Ball-and-seat can ensure under flushing pump in screen casing operation process that pumping lower screen casing and rinsing space and can build the pressure makes flushing valve Normal work, prevent flushing fluid down into stratum and cannot on return, ball-and-seat 3, which also can avoid pumping lower screen casing 2 when well-flushing, to be stopped Dirt fall into bottom screen casing 4, moreover it is possible to since the equipment such as cementing truck are unstable when well-flushing being avoided to suppress, flushing fluid instantaneous pressure Cause to build the pressure in well when rising so as to cause underground risk.Fishing head is set on ball-and-seat 3, needs to carry out other operations of underground When, ground can be salvaged.

Further, as shown in Figure 13, Figure 14, the second top connection 3151 is located at the outer wall at ball-and-seat flushing fluid via 314 Diameter is located at outer wall and the second top connection 3151 at ball-and-seat flushing fluid via 314 in setting, the second top connection 3151 is increased The 5th stage portion 3154 is constituted between the outer wall of 314 lower section of ball-and-seat flushing fluid via, the 5th stage portion 3154 can contact Under on the top surface of the second packer 62, avoiding ball-and-seat 3 from crashing into the second packer 62 under the action of the superpressure flushing fluid of top In the casing or open hole of side.

When carrying out oil-gas mining using the deblocking type sand control pipe structure 100 of screen casing under the energy flushing pump of the present invention, first Sand sediment pipe silk plug is sealedly attached to the bottom of sand sediment pipe 5, bottom device for plug of sieve tube is sealedly attached to the bottom of bottom screen casing 4, Bottom screen casing 4 is penetrated from top to bottom in sand sediment pipe 5, and sand sediment pipe 5 is made to be threadedly coupled with bottom screen casing 4,4, screen casing in bottom It is arranged the second packer 62 in the top of sand sediment pipe 5, connects bottom screen casing 4 using oil pipe (prior art) and by its G.I.H Designated position, suppresses to give up and sets to the second packer 62, rise flowline and the second packer 62 back-off sub (prior art, Packer is given up the necessary structure of operation), later by 3 tripping in bottom screen casing 4 of ball-and-seat；

The lower device for plug of sieve tube of pump is sealedly attached to the bottom of screen casing 2 under pump, by well-flushing by the assembling for then completing flushing valve 1 Second lower contact 13 of valve 1 is sealedly attached to the top of screen casing 2 under pump, and the first packer 61 is sheathed on the first lower contact 105 Outer wall on, the first top connection 101 is sealedly attached to the bottom of oil well pump 9, oil well pump 9 is connected on oil pipe, will be under pump Screen casing 2 G.I.H specified position is completed the first packer 61 and is set, by oil pipe be fixed on wellhead oil tree (prior art, Shaft collar).At this point, flushing valve 1 is in running order, that is, the bottom surface for sliding inner tube 11 is resisted against in second step portion 123, the Two projecting ring sections, 112 the second intercommunicating pore of sealed spacer 1022 and flushing fluid return the straight passageway of row, sliding inner tube side open-work 113 and internal ring portion Side open-work 10211 is axially offset, and output object channel 83 is in connected state (connection inner tube centre bore 120, sliding inner tube centre bore 110, the first pillar side open-work 1141 is connected to the inner cavity of the cylinder sleeve structure 10 of 1141 top of the first pillar side open-work)；

As shown in Figure 1, in production process, output gas-liquid passes through sand sediment pipe 5, bottom screen casing from bottom to top under pressure 4, the lower screen casing 2 of ball-and-seat 3, pump, output object channel 83 (connection inner tube centre bore 120, sliding inner tube centre bore 110, the first pillar The inner cavity of the cylinder sleeve structure 10 of side open-work 1141 and the top of the first pillar side open-work 1141) and oil well pump 9 flow to ground；It produced Cheng Zhong, formation sand are flowed up with output gas-liquid, and bulky grain sand is barred from outside sand sediment pipe 5 by sand sediment pipe 5, avoids it with production Going out in gas-liquid and returns, bottom screen casing 4 will enter larger particles sand in the output gas-liquid in sand sediment pipe 5 and be barred from outside bottom screen casing 4, compared with Bulky grain sand, which sinks, drops down onto the intracavity bottom of sand sediment pipe 5, pump lower screen casing 2 will enter the first packer 61 and the second packer 62 it Between annular space output gas-liquid in smaller particle sand be barred from outside the lower screen casing of pump 2, the further desanding of output gas-liquid is filtered.

As shown in Fig. 2, after production a period of time, pumps the lower saturating gap of screen casing overcurrent and blocked by reservoir sand, needed to pumping lower screen casing 2 It is rinsed de-plugging.Stop 9 Pumping action of oil well pump at this time, ring flushing fluid being injected into from well head above the first packer 61 In the air, the first packer 61 can avoid the flushing fluid of annular space from continuing to flow downward, and flushing fluid covers side open-work through the first fluid cylinder 1025 and first oversheath side open-work 1031 enter flushing fluid admission chamber (the i.e. bottom surface of the first projecting ring section 111, cylinder sleeve structure 10 Inner wall, slide inner tube 11 outer wall and the top surface of the second internal ring portion 1021 between space), the first projecting ring section of flushing fluid pair 111 Bottom surface generate upward thrust, under the action of the thrust, sliding inner tube 11 move up, resetting spring 7 is compressed at this time, Sliding inner tube 11 moves up until the top surface sealing of the first convex pillar part 114 is resisted against on the bottom surface of the first internal ring portion 1012, and first is convex Column side open-work 1141 is blocked, and the inner cavity for sliding the cylinder sleeve structure above inner tube centre bore 110 and the first pillar side open-work is mutual Isolation, output object channel 83 is disconnected, at this point, flushing fluid injection channel 81 (the second flushing fluid entrance structure, internal ring portion side open-work 10211, sliding inner tube side open-work 113 and sliding inner tube centre bore 110) it is connected to, flushing fluid returns row channel 82, and (flushing fluid, which returns, to be discharged into The straight passageway of row is returned in mouth space, flushing fluid, flushing fluid returns and arranges spatial transition, the second intercommunicating pore 1022, cylinder sleeve side wall channels, the first company The inner cavity of through-hole 1013 and the cylinder sleeve structure 10 of 1013 top of the first intercommunicating pore) it is connected to；Flushing fluid passes through flushing fluid injection channel 81 enter sliding inner tube centre bore 110, and flow downward in the lower screen casing of pump 2, flushing fluid by the pump saturating gap of lower screen casing overcurrent from The interior and nonlocal lower screen casing of flow direction pump rinses space (i.e. closed space between the first packer 61 and the second packer 62), realizes The flushing de-plugging of screen casing 2 under pump.The lower screen casing of pump rinses flushing fluid in space and returns drainage upwards under downlink well-flushing action of hydraulic force Dynamic, flushing fluid returns row channel 82 by flushing fluid and backflows to oil well pump 9 after flushing, is returned under the action of oil well pump 9 and drains into ground, Avoid pollution of the flushing fluid to reservoir.

From the above mentioned, the deblocking type sand control pipe structure of screen casing has following beneficial effect under energy flushing pump provided by the invention Fruit：

(1) under energy flushing pump of the invention in the deblocking type sand control pipe structure of screen casing, flushing valve is both provided with output object Channel meets the mining requirement that output gas-liquid in production process flows to oil well pump from bottom to top, and being additionally provided on flushing valve allows to wash The flushing fluid that well liquid flows into the flushing fluid injection channel of the lower screen casing of pump and is isolated with flushing fluid injection channel from the outside to the core returns To meet the flushing requirement for cleaning to pumping lower screen casing, the lower screen casing of pump is connected and composed integrated knot by flushing valve with oil well pump in row channel The lower screen casing of pump need not be detached with oil well pump when well-flushing, oil pumping need not also be pumped up out to bottom surface, pump lower sieve by structure The flushing direction of pipe is from inside to outside, to flow into the direction of the lower screen casing of pump with output gas-liquid on the contrary, well-flushing plugging removal effect is good, save A large amount of operating costs；Well-flushing liquid energy returns out ground by oil well pump, avoids the pollution on stratum, ensure that the normal life of oil well Production；

(2) under energy flushing pump of the invention in the deblocking type sand control pipe structure of screen casing, bottom screen casing is located at the second packing Outer wall upper sleeve gasket below device is equipped with sand sediment pipe, and sand sediment pipe is used for storing the reservoir sand stopped by bottom screen casing, avoids stratum Sand falls into formation blockage Reservoir Section；

(3) under energy flushing pump of the invention in the deblocking type sand control pipe structure of screen casing, ball-and-seat can ensure flushing pump In lower screen casing operation process, pumping lower screen casing and rinsing space and can build the pressure makes flushing valve work normally, prevent flushing fluid down into Stratum and cannot on return, also can avoid pumping the dirt that lower screen casing stops when well-flushing and fall into the screen casing of bottom, moreover it is possible to well-flushing be avoided to beat Since the equipment such as cementing truck are unstable when pressure, flushing fluid instantaneous pressure cause to build the pressure in well when rising so as to cause underground wind It is dangerous, fishing head is set on ball-and-seat, when needing to carry out other operations of underground, ground can be salvaged.

The foregoing is merely the schematical specific implementation modes of the present invention, are not limited to the scope of the present invention.It is any Those skilled in the art, made equivalent variations and modification under the premise of not departing from design and the principle of the present invention, The scope of protection of the invention should be belonged to.

Claims (12)

1. the deblocking type sand control pipe structure of screen casing under a kind of energy flushing pump, which is characterized in that screen casing under the energy flushing pump Deblocking type sand control pipe structure includes the flushing valve that top is connect with the sealed bottom of oil well pump, the outer wall bottom of the flushing valve Sealing shroud is equipped with the first packer that can fix the flushing valve, and the lower inside of the flushing valve, which can seal, is communicatively equipped with pump Lower screen casing, the saturating gap of the lower screen casing overcurrent of setting pump on the sealed bottom of screen casing and side wall under the pump, screen casing is in an axial direction under the pump It is positioned apart from the lower section of first packer；Being provided with below screen casing under the pump allows output gas-liquid from bottom to top The ball-and-seat of flowing, the ball-and-seat are set to the lower section of screen casing under the pump, the lower part of the ball-and-seat axially spacedly Sealing connection is equipped with bottom screen casing, and screen casing overcurrent saturating gap in bottom is arranged on the sealed bottom and side wall of the bottom screen casing, described The outer wall top of bottom screen casing is arranged with the second packer that can fix the bottom screen casing, first packer and described Screen casing under pump that is closed and being connected to the inner cavity of screen casing under the pump is constituted between two packers rinses space, the well-flushing The flushing fluid that being provided on valve allows annular space of the flushing fluid from above first packer to flow inward into screen casing under the pump is noted Enter channel, be provided on the flushing valve allow flushing fluid under the pump screen casing rinse space flow to oil well pump and with it is described The flushing fluid of flushing fluid injection channel isolation setting returns row channel, be additionally provided on the flushing valve allow output gas-liquid from lower and The upper output object channel for flowing into oil well pump.

2. the deblocking type sand control pipe structure of screen casing under energy flushing pump as described in claim 1, which is characterized in that the bottom Screen casing is located at the outer wall upper sleeve gasket below second packer and is equipped with sand sediment pipe, the sand setting bottom of the tube in sealed set and The outer wall of the inner wall of the sand sediment pipe and the bottom screen casing is radially spaced setting, and the side wall of the sand sediment pipe, which is equipped with, to be allowed The saturating gap of sand sediment pipe overcurrent that output gas-liquid flows into from the outside to the core.

3. the deblocking type sand control pipe structure of screen casing under energy flushing pump as claimed in claim 1 or 2, which is characterized in that described Flushing valve includes cylinder sleeve structure, and the top of the cylinder sleeve structure can communicatively be sealedly attached to the bottom of oil well pump, the cylinder sleeve The bottom energy sealing shroud of structure is set in first packer, and the cylinder sleeve structure interior energy is slidably arranged with top end surface envelope The sliding inner tube of setting is closed, is equipped with the sliding inner tube centre bore of bottom opening, the cylinder sleeve knot in the sliding inner tube in an axial direction The inside of structure is equipped with positioned at the lower section fixing sleeve of the sliding inner tube and extends downwardly the connection inner tube for being pierced by the cylinder sleeve structure, institute State connection inner tube in setting axially through connection inner tube centre bore, it is described connection inner tube bottom can communicatively be tightly connected institute State the lower screen casing of pump.

4. the deblocking type sand control pipe structure of screen casing under energy flushing pump as claimed in claim 3, which is characterized in that the sliding The outer wall of inner tube and the inner wall of the cylinder sleeve structure are radially spaced setting, and the top of the sliding inner tube is increased equipped with diameter First projecting ring section, the outer wall bottom of the sliding inner tube and first projecting ring section are increased in diameter has been positioned apart from up and down Inner wall of the outer wall of second projecting ring section, the outer wall of first projecting ring section and second projecting ring section with the cylinder sleeve structure be in Sealing slides against setting, and the sliding inner tube is provided with radial direction between first projecting ring section and second projecting ring section The sliding inner tube side open-work of perforation, the top setting diameter of the sliding inner tube is in the first convex pillar part for reducing setting, and described the Top plate portion is set on one convex pillar part, the outer diameter of the top plate portion is less than the outer diameter of first convex pillar part, and described the Radially perforation setting can be connected to the of the inner cavity for sliding inner tube centre bore and the cylinder sleeve structure on the side wall of one convex pillar part One pillar side open-work；

The upper inside wall of the cylinder sleeve structure is located at the setting internal diameter of the position above first projecting ring section in reducing the of setting One stage portion, the first step portion and the top surface of first projecting ring section are arranged in interval up and down, and the sliding inner tube is located at Outer wall above first projecting ring section can be located at the sliding of the inner wall sealing above the first step portion along the cylinder sleeve structure, The outer wall of first convex pillar part is radially spaced setting with the inner wall that the cylinder sleeve structure is located above the first step portion； Positioned at the top in first step portion setting internal diameter in the first internal ring portion for reducing setting, institute on the inner wall of the cylinder sleeve structure It states top plate portion and can slide and be arranged in first internal ring portion, the top surface of first convex pillar part, which can seal, is resisted against described first The uplink limiting section of the sliding inner tube is constituted on the bottom surface of internal ring portion；The first step portion, the cylinder sleeve structure inner wall, Reseting cavity is constituted between the outer wall and the top surface of first projecting ring section of the sliding inner tube, the reset cavity inner sleeve, which is equipped with, to be resetted Spring；

Position on the inner wall of the cylinder sleeve structure and between first projecting ring section and second projecting ring section, which is fixed, to be set It is equipped with the second internal ring portion, the sliding inner tube, which can seal, slidably to be worn through second internal ring portion, first projecting ring section Bottom surface, the inner wall of the cylinder sleeve structure, constitute and wash between the outer wall and the top surface of second internal ring portion of the sliding inner tube Well liquid admission chamber, radially perforation is provided with the first well-flushing being connected to the flushing fluid admission chamber on the side wall of the cylinder sleeve structure Liquid entrance structure, the position that second internal ring portion is located on the side wall of the cylinder sleeve structure radially penetrate through the second flushing fluid of setting Entrance structure, in radially perforation setting can be connected to the second flushing fluid entrance structure on the side wall of second internal ring portion Ring portion side open-work, sliding inner tube side open-work, which can slide, moves up tube hub in connection internal ring portion side open-work and the sliding Hole；

Axially disposed cylinder sleeve side wall channels closed at both ends in the side wall of the cylinder sleeve structure, on the side wall of the cylinder sleeve structure Positioned at the top of first internal ring portion, setting can be connected to the first of the inner cavity of the cylinder sleeve side wall channels and the cylinder sleeve structure Intercommunicating pore, the lower section setting of second internal ring portion is located on the side wall of the cylinder sleeve structure can be connected to the cylinder sleeve side wall channels With the second intercommunicating pore of the inner cavity of the cylinder sleeve structure, first intercommunicating pore, the cylinder sleeve side wall channels and described second connect Through-hole is in circumferential stagger setting with the first flushing fluid entrance structure, the second flushing fluid entrance structure；

It is described connection inner tube outer diameter be less than the cylinder sleeve structure lower inner diameter size, it is described connection inner tube outer wall on In the boss structure for increasing setting, the outer wall sealing of each boss structure is arranged circumferentially spaced at least two outer diameters that are provided with In on the inner wall of the cylinder sleeve structure, constituted between the inner wall of the cylinder sleeve structure and the side wall of the two neighboring boss structure Flushing fluid returns the straight passageway of row, the inner cavity bottom end of the cylinder sleeve structure, the bottom surface of each boss structure, the cylinder sleeve structure it is interior Flushing fluid is constituted between wall and the outer wall of the connection inner tube and returns row's entrance space, and the flushing fluid returns the bottom of row's entrance space Space, which is rinsed, with screen casing under the pump is connected to setting；The second convex pillar part of outer diameter reduction is provided at the top of the connection inner tube, Second step portion, the second step portion sealing are constituted between the bottom of second convex pillar part and the outer wall of the connection inner tube It is resisted against the downlink limiting section that the sliding inner tube is constituted on the bottom surface of the sliding inner tube；The inner wall lower of the sliding inner tube Sliding sleeve can be sealed on the outer wall of second convex pillar part, second intercommunicating pore is located at second internal ring portion and described Between second step portion, the bottom surface of second projecting ring section, the sliding bottom surface of inner tube, the inner wall of the cylinder sleeve structure, institute It states and constitutes flushing fluid between the outer wall of the second convex pillar part, the outer wall and the top surface of the boss structure of the connection inner tube and return and be drained through Space is crossed, second intercommunicating pore can be connected to the flushing fluid and return row's spatial transition and the cylinder sleeve side wall channels；

The connection inner tube centre bore, the sliding inner tube centre bore, first pillar side open-work and first pillar side The inner cavity of cylinder sleeve structure above open-work, which can be connected to, constitutes output object channel；The second flushing fluid entrance structure, the inner ring Portion side open-work, the sliding inner tube side open-work and the sliding inner tube centre bore, which can be connected to, constitutes the flushing fluid injection channel, The flushing fluid returns row's entrance space, the flushing fluid returns the straight passageway of row, the flushing fluid returns row's spatial transition, described second connects The inner cavity of cylinder sleeve structure above through-hole, the cylinder sleeve side wall channels, first intercommunicating pore and first intercommunicating pore can connect The logical composition flushing fluid returns row channel.

5. the deblocking type sand control pipe structure of screen casing under energy flushing pump as claimed in claim 4, which is characterized in that the cylinder sleeve Structure includes the first top connection that top can communicatively be sealedly attached to the bottom of oil well pump, and the inside of first top connection is set Have axially through the first top connection endoporus, setting first internal ring portion in the first top connection endoporus, on described first The bottom surface of connector constitutes the first step portion, and the outer wall sealed bottom fixation of first top connection, which is arranged, extends downwardly setting Fluid cylinder set, first intercommunicating pore, institute is arranged in the top that first internal ring portion is located on the side wall of first top connection The the first top connection side groove for being provided on the outer wall of the first top connection and extending downwardly setting from first intercommunicating pore is stated, it is described It is provided with the fluid cylinder being extended from top down on the outer wall of fluid cylinder set and covers side groove, the bottom of the fluid cylinder set side groove is in Closing setting, the fluid cylinder set side groove is in be connected to setting with first top connection side groove, on the side wall of the fluid cylinder set Positioned at the lower section of second internal ring portion, setting third fluid cylinder covers side open-work, the fluid cylinder set side groove and the third fluid cylinder set Side open-work is arranged in connection, and the outer cover that first top connection and the fluid cylinder covers is connected to equipped with can be coated on described first Oversheath outside hole, first top connection side groove, fluid cylinder set side groove and third fluid cylinder set side open-work, institute State that constitute the cylinder sleeve side wall between the first top connection side groove, fluid cylinder set side groove and the inner wall of the oversheath logical Road；

Position of the fluid cylinder set between first projecting ring section and second projecting ring section, which is fixed, to be arranged in described second Ring portion, axially spaced-apart is arranged that the first fluid cylinder covers side open-work and the second fluid cylinder covers side open-work on the side wall of fluid cylinder set, described outer The first oversheath side open-work being connected to first fluid cylinder set side open-work, the side of the oversheath are provided on the side wall of sheath The second oversheath side open-work being connected to second fluid cylinder set side open-work is additionally provided on wall, first fluid cylinder covers side open-work It is connected to first oversheath side open-work and constitutes the first flushing fluid entrance structure, the second fluid cylinder set side open-work and institute It states the second oversheath side open-work connection and constitutes the second flushing fluid entrance structure, the fluid cylinder set side groove and first liquid Cylinder sleeve side open-work and second fluid cylinder set side open-work are in circumferential stagger setting；

The lower inside fixing sleeve of the fluid cylinder set, which is equipped with to extend downwardly, is pierced by the transition inner tube that the fluid cylinder covers, in the transition The top surface of pipe and the bottom surface contact of second internal ring portion are arranged, and the internal diameter size of the transition inner tube is more than the connection inner tube Outer diameter, the outer wall sealing shroud of each boss structure is set on the inner wall of the transition inner tube, second projecting ring section The inner wall of outer wall and the transition inner tube slide against setting in sealing, on the side wall of the transition inner tube with the third liquid Transition inner tube side open-work is communicatively arranged in cylinder sleeve side open-work, and the third fluid cylinder set side open-work and transition inner tube side open-work connect Siphunculus constitutes second intercommunicating pore, and the outer wall lower part fixing sleeve of the transition inner tube is equipped with the first lower contact of inner hollow, The outer wall sealed bottom of first lower contact is sheathed in first packer, the inner wall of first lower contact with it is described Radially interval setting between the outer wall of connection inner tube；

The outer wall bottom fixing sleeve of the connection inner tube is equipped with the second lower contact, and the inside bottom of second lower contact can be connected to Ground is tightly connected screen casing under the pump.

6. the deblocking type sand control pipe structure of screen casing under energy flushing pump as claimed in claim 4, which is characterized in that described first The internal diameter size of internal ring portion is in identical setting with the outer diameter of the top plate portion, and the outer wall of the top plate portion can seal sliding and support It is against on the inner wall of first internal ring portion.

7. the deblocking type sand control pipe structure of screen casing under energy flushing pump as described in claim 1, which is characterized in that single stream Valve includes the ball-and-seat outer tube structure being coaxially arranged and ball-and-seat inner tube, and the ball-and-seat inner tube can be along the ball-and-seat outer tube knot Structure slides axially, and ball-and-seat ball valve seat is arranged in the top of the ball-and-seat outer tube structure, can be sealed on the ball-and-seat ball valve seat Ball sealer is arranged in contact, is upwardly extended at the top of the ball-and-seat outer tube structure and is provided with overcurrent head, the side wall of the overcurrent head Upper setting allows the ball-and-seat output object via that gas-liquid output object flows out, the ball-and-seat outer tube structure to be located at the ball-and-seat ball The ball-and-seat flushing fluid via that can be connected to the inner cavity of the ball-and-seat inner tube, single stream are set on the side wall of the lower section of valve seat Valve outer tube structure is located inside upper part of the lower section sealing shroud set on the bottom screen casing of the ball-and-seat flushing fluid via.

8. the deblocking type sand control pipe structure of screen casing under energy flushing pump as claimed in claim 7, which is characterized in that single stream Valve is the ball-and-seat that can be salvaged, and is upwardly extended at the top of the overcurrent head and is provided with fishing head.

9. the deblocking type sand control pipe structure of screen casing under energy flushing pump as claimed in claim 8, which is characterized in that the salvaging Head includes the fishing rod upwardly extended from the overcurrent overhead, and conehead, the salvaging are salvaged in the top setting of the fishing rod The bottom-up tapered setting of diameter of conehead.

10. the deblocking type sand control pipe structure of screen casing under energy flushing pump as claimed in claim 7, which is characterized in that the list It includes ball-and-seat outer tube to flow valve outer tube structure, and the inner wall of the outer wall of the ball-and-seat inner tube and the ball-and-seat outer tube is in diameter It is arranged to interval, the second top connection of inner hollow, the ball-and-seat is fixedly connected at the top of the inner wall of the ball-and-seat outer tube The inner wall bottom of outer tube is fixedly connected with the third lower contact of inner hollow, the outer wall of the ball-and-seat inner tube can slidably against On the inner wall of second top connection and the third lower contact, the bottom surface of second top connection and the third lower contact Top surface between constitute ball-and-seat inner tube sliding stroke chamber, be arranged with ball-and-seat projecting ring section on the outer wall of the ball-and-seat inner tube, The outer wall of the ball-and-seat projecting ring section can be slidably resisted against on the inner wall of the ball-and-seat outer tube, the ball-and-seat projecting ring section Top surface can be engaged with the bottom surface contact of second top connection, the bottom surface of the ball-and-seat projecting ring section and the third lower contact Top surface between be provided with ball-and-seat spring；Third internal ring portion is set in second top connection, and the third internal ring portion is constituted The ball-and-seat ball valve seat, second top connection is interior to be arranged third stage portion positioned at the lower section of the third internal ring portion, described Second top connection, which is located on the side wall below the third stage portion, is arranged the ball-and-seat flushing fluid via, in the ball-and-seat It is upwardly extended at the top of pipe and is provided with the third pillar that diameter is arranged in reduction, on the outer wall of the third pillar and described second Radially interval setting between the inner wall of connector, the top surface of the third pillar can be resisted against in the third stage portion, described The 4th stage portion is constituted between the bottom of third pillar and the outer wall of the ball-and-seat inner tube；The third stage portion, described The inner wall of two top connections, the third pillar outer wall and the 4th stage portion between constitute ball-and-seat flushing fluid be filled with chamber.

11. as claimed in claim 10 can under flushing pump screen casing deblocking type sand control pipe structure, which is characterized in that described the Two top connections are located at the outer diameter at the ball-and-seat flushing fluid via and are located at described in setting, second top connection is increased Outer wall at ball-and-seat flushing fluid via and second top connection be located at the outer wall below the ball-and-seat flushing fluid via it Between constitute the 5th stage portion, the 5th stage portion can be resisted against on the top surface of second packer.

12. the deblocking type sand control pipe structure of screen casing under energy flushing pump as claimed in claim 2, which is characterized in that described heavy The circumferential width size of the saturating gap of sandpipe overcurrent is more than the circumferential width size of the saturating gap of bottom screen casing overcurrent, the bottom screen casing The circumferential width size of the saturating gap of overcurrent is more than the circumferential width size of the saturating gap of screen casing overcurrent under the pump.