CN209040777U - A kind of continuous sand flushing well-flushing tool - Google Patents

Abstract

The utility model provides a kind of continuous sand flushing well-flushing tool, and tool includes flushing fluid reversal valve and bushing pipe, and the flushing fluid reversal valve is divided into direct circulation reversal valve, reacting cycle reversal valve, connect with oil pipe interval.The bushing pipe upper end is connect by screw thread with liner hanger, then liner hanger is put into wellhead casing pipe four-way, is fixed liner hanger with the hanger jackscrew of wellhead casing pipe four-way；The tubular column string that the oil pipe and flushing fluid reversal valve interval are formed by connecting when sand washing operation is walked from top to bottom in bushing pipe, realize that space separates with bushing pipe cooperation by the sealing ring on flushing fluid reversal valve outer tube, and continuous sand flushing operation is realized in the automatic runner variation of flushing fluid reversal valve, termination of pumping is not necessarily to after when making up a joint, depositing gravel is effectively avoided, operating efficiency and operational security are improved.

Description

A kind of continuous sand flushing well-flushing tool

Technical field

The utility model relates to the workover treatment tubing string of petroleum industry, especially a kind of continuous sand flushing well-flushing tool.

Background technique

During hydraulic sand washing traditional at present, direct circulation sand washing process or inverse circular sand washing adapter technique are either used, Termination of pumping is required when connecing every sand clean out pipe --- to unload elbow and oily nonyl --- even oily nonyl and elbow --- and sling connection sand washing Manage --- turn on pump circulation --- down tube sand washing.There are the following problems: 1. worker for the operation mode of this frequent termination of pumping adapter tube sand washing Troublesome in poeration, large labor intensity when operating not smooth, be easy to cause inclined button and causes to repeat upper shackle；2. cannot when termination of pumping Circulation well cleanup is constituted, the silt for causing annular space to suspend sinks, so that it is former to easily cause sand setting card to run affairs；Meanwhile it being wanted before each termination of pumping Sufficiently circulation, sand washing efficiency are relatively low.3. the frequent handling of oily nonyl, which are likely to occur when detaining in rotation, makes showing for top oil nonyl shackle As causing leakage or elbow to be fallen with rotary hose, causing to connect oily nonyl again or high-altitude junk hurts sb.'s feelings and waits major accidents.

For this purpose, domestic relevant unit has carried out correlative study to realize continuous sand washing technique.Liaohe Oil Field Song Yan force etc. is ground The technique for having studied carefully a set of continuous positive sand washing, this set technology is mainly by positive sand flushing tool, Well head flow path, well mouth sealing device etc. Composition, this set technology realizes continuous positive sand washing function, while this set technology has the disadvantage that (1) installation Well mouth sealing device increases well head height, increases difficulty when well head construction；(2) connect sand washing it is single when, although not needing Termination of pumping, but need manual adjustment valve spider handle change process, it is single connected after, it is also necessary to manually process is refunded, is increased The risk of construction；(3) this sand washing process can only carry out positive sand washing, not can be carried out recoil sand.Middle petroleum gas share has The reverse circulation continuous sand flushing commutation pipe nipple for limiting the researchs such as the Feng Zhen of limited liability company can carry out during inverse circular sand washing adapter Liquid flow direction conversion, realizes continuous sand flushing.But manual operation conversion liquid flow direction is also needed when being made up a joint in the technology, together When tool in there are elastic elements in sand cleaning fluid vulnerable influence tool reliability.The researchs such as the Wu Jian of TulufanHami oil field it is continuous Negative pressure sand washing process tubing string includes self-styled sand washing, special suspension device, seal operation cylinder, backwash valve group, liquid stream converter, negative pressure Sand washing pump etc..The set technique can realize negative pressure continuous sand flushing well, but since it is equipped with back flush valve group and liquid stream simultaneously The process costs that more set tools such as converter increase.The positive and negative waterpower of horizontal well of middle petroleum Changqing oilfields branch company research is continuously followed Ring apparatus for work is using commutation well head and is connected to oil pipe upper end and is sitting in the commutation pipe nipple cooperating of well head, realizes not termination of pumping Positive and negative Hydraulic Circulation operation, but still needed to when its Hydraulic Circulation operation well head commutation pipe nipple top connection connection water outlet the fire hose 1. and 3. good solution that the problem of band or waterflood-transmission line, heavy workload when making up a joint, live sand washing operation does not obtain Certainly.

Therefore, current continuous sand washing technique there are aiming at the problem that, have studied and a set of be suitable for current workover treatment, and energy Anti- sand washing operation is carried out, construction technology is simple, lower-cost process pipe string and its corollary apparatus.

Utility model content

The purpose of this utility model is to provide a kind of continuous sand flushing well-flushing tools, realize continuous sand flushing operation, make up a joint When after be not necessarily to termination of pumping, effectively avoid depositing gravel, improve operating efficiency and operational security.

The continuous sand flushing well-flushing tool includes flushing fluid reversal valve, bushing pipe, and the flushing fluid reversal valve includes that direct circulation is changed To valve, reacting cycle reversal valve, the direct circulation reversal valve, reacting cycle reversal valve are spaced apart from each other formula and are connected between oil pipe string, altogether With tubular column string is constituted, the liner hanger is put into wellhead casing pipe four-way, and liner hanger is fixed on wellhead casing pipe four-way On hanger jackscrew, the tubular column string is walked from top to bottom in bushing pipe.

The direct circulation reversal valve includes top connection, outer tube, lower contact, central tube, includes upper unidirectional in the top connection Valve, the outer tube upper end connect top connection, and lower end connects lower contact, and the central tube is located at outer tube, central tube and outer tube Between constitute annular space, lower check valve is set in the central tube lower semisection, and central tube upper end blocks, and central tube side wall opens up at least Three column recirculation hole battle arrays, each column recirculation hole battle array at least open up three recirculation holes, and the outer tube opens up connection runner, connection runner with Recirculation hole battle array on central tube is corresponding, center tube fluid by recirculation hole be connected to runner and flow to central tube outside, it is described in Annular space connection top connection and lower contact are formed between heart pipe and outer tube.

The purpose of this utility model can be also achieved by the following technical measures:

The outer wall lower part of the outer tube is equipped with sealing ring, the annular space between sealing ring energy seal well washing liquid reversal valve and bushing pipe Space.

The reacting cycle reversal valve include top connection, outer tube, lower contact, central tube, slide valve lever, upper valve core, connecting rod, under Spool, the top connection is interior to be arranged upper slide valve seat, and the outer tube upper end connects top connection, and lower end connects lower contact, the center Lower slide valve seat is arranged in pipe lower semisection inner wall, and the central tube side wall opens up at least three column recirculation hole battle arrays, and each column recirculation hole battle array is extremely Three recirculation holes are opened up less, and annular space is constituted between the central tube and outer tube, the connecting rod upper end passes through central tube upper port, Central tube upper port is that sliding sealing is connect with connecting rod, and slide valve lever upper end connects upper valve core, and upper valve core is opposite with upper valve base It answers, connecting rod lower end connects bottom spool, and bottom spool is corresponding with lower valve base, and slide valve lever moves up and down, and upper valve core can cooperate upper valve Seat realizes the opening and closing of flow path, and bottom spool can cooperate the opening and closing of lower valve base realization flow path；The outer wall lower part of the outer tube is equipped with close Seal ring, the annulus space between sealing ring energy seal well washing liquid reversal valve and bushing pipe.

Wellhead casing pipe four-way upper end connects single ram type perventer, and single ram type perventer upper end connects well-flushing threeway.

Self-sealing rubber core is set inside the well-flushing threeway upper port, and the upper surface of self-sealing rubber core is placed from sealed cover, self-styled pressure Lid is bolted with well-flushing threeway using flange connection, so that self-sealing rubber core be compressed.

The utility model has the advantages that compared with prior art

Not termination of pumping when 1. sand washing makes up a joint, can be effectively prevented from because termination of pumping makes up a joint and caused by sand setting card run affairs therefore, subtract Few operation processing sand card and overhaul solution desanding card job execution；

2. back with water inlet line and rotary hose are both connected to well head, frequently disassembly is not had in operation process, sand washing operation can be reduced Labor intensity, and avoid elbow from falling off and cause personal injury accidents；

3. after the completion of process connection, it is not necessarily to during sand-flushing to operate the device that any process is related to sand washing can be completed Process.

4. continuous not termination of pumping sand washing operation is high-efficient, while sand washing can be improved and return out effect, to optimization sand washing operation matter Amount extends the oil well production period, increases crude output and plays an important role；

5. process pipe string structure is simple, easy to install and use, while shaft mouth operation height is low.

Detailed description of the invention

Fig. 1 is a kind of continuous sand washing technique tubular column structure schematic diagram of the utility model；

Fig. 2 is a kind of continuous direct circulation sand flushing tool structural schematic diagram of the utility model；

Fig. 3 is a kind of continuous inverse circular sand washing adapter tool construction schematic diagram of the utility model.

In figure: 1-oil pipe；1a-goes up oil pipe；The middle oil pipe of 1b-；The lower oil pipe of 1c-；2-from sealed cover；3-from sealing Core；4-well-flushing threeways；5-single ram type perventers；6-wellhead casing pipe four-ways；7-liner hangers；8-bushing pipes；9-well-flushings Liquid reversal valve；9a-goes up flushing fluid reversal valve；The middle flushing fluid reversal valve of 9b-；The lower flushing fluid reversal valve of 9c-；9.1-direct circulations Reversal valve；9.11-top connection；9.12-upper check valves；9.13-outer tube；9.14-central tube；9.15-recirculation hole； 9.16-connection runners；9.17-lower check valves；9.18-lower contact；9.19-sealing ring；9.2-reacting cycle reversal valves； 9.21-top connection；9.22-upper slide valve seats；9.23-slide valve lever；9.231-upper valve core；9.232-connecting rod；9.233— Bottom spool；9.24-outer tube；9.25-connection runners；9.26-central tube；9.27-recirculation hole；9.28-lower slide valve seats； 9.29-sealing ring；9.210-lower contact；10-casings.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

Fig. 1 and Fig. 2 or Fig. 1 and Fig. 3 are please referred to, the utility model provides a kind of technical solution: a kind of continuous punching sand washing Well tool, including oil pipe 1 and flushing fluid reversal valve 9, wherein flushing fluid reversal valve 9 divides for direct circulation reversal valve 9.1 and reacting cycle Reversal valve 9.2 further includes bushing pipe 8, and bushing pipe upper end is connect by screw thread with liner hanger 7, then liner hanger is put into well In mouth four-way junction of casing 6, liner hanger is fixed with the hanger jackscrew of wellhead casing pipe four-way, liner hanger is equipped with sealing Part；The oil pipe 1, which divides, is at least arranged two for upper oil pipe 1a, middle oil pipe 1b and lower oil pipe 1c, the middle oil pipe 1b, described to oil Between pipe 1a and the middle oil pipe 1b of the top, between lower oil pipe 1c and the middle oil pipe 1b of bottom, middle oil pipe connects between any two It is connected to flushing fluid reversal valve 9, the flushing fluid reversal valve 9 that the oil pipe 1 and interval connect is intended to walk from top to bottom in bushing pipe, The length of the bushing pipe 8 is greater than the sum of the length of an oil pipe 1 and a flushing fluid reversal valve 9, and the flushing fluid reversal valve is Direct circulation reversal valve or reacting cycle reversal valve.The outside of flushing fluid reversal valve 9 is equipped with sealing ring 9.19 or 9.29, can cooperate lining The isolation of pipe realization oil pipe and bushing pipe annular space and lower section oil jacket annulus.

4 single ram type perventer 5 of well-flushing threeway and wellhead casing pipe four-way 6 are connected by flange connection respectively；It is self-styled Glue core 3 is mainly used for sealing oil pipe, is placed in the upper surface of self-sealing rubber core 3 from sealed cover 2, from sealed cover 2 design by oil pipe or The through-hole that tool passes through is bolted, thus will be from sealing using flange connection with well-flushing threeway 4 from sealed cover 2 Core 3 compresses.

As shown in Fig. 2, the direct circulation reversal valve 9.1 includes top connection 9.11, outer tube 9.13, lower contact 9.18.It is described The top connection 9.11 of direct circulation reversal valve 9.1 is connect by screw thread with top oil pipe, includes upper check valve in top connection 9.11 9.12, it can be valve ball valve seat form, it is just openable when only upper flow pressure is greater than fluid beneath pressure to make liquid communication.It is described Direct circulation reversal valve 9.1 further includes central tube 9.14, and the outer tube 9.13 connects lower contact 9.18, and outer tube circumference uniform distribution opens up At least three column connection runners 9.16；Below upper check valve 9.12, upper end blocks the central tube 9.14, is located at central tube side wall At least three column recirculation hole battle arrays are opened up, each column recirculation hole battle array at least opens up three recirculation holes 9.15, each column recirculation hole 9.15 It is corresponded with the connection runner 9.16 of outer tube, space is with the outer tube external space by being connected to runner 9.16 and circulation in central tube Hole 9.15 is connected to, and central tube 9.14 is connect with the multiple groups runner 9.16 that outer tube 9.13 coaxially fits through circle distribution；In described Heart pipe 9.14 includes lower check valve 9.17, is connected to central tube lower part, when only Fluid pressure is greater than fluid beneath pressure above It is just openable to make liquid communication, it can be valve ball, valve seat form.It is upper unidirectional that annular space connection is formed between the central tube and outer tube Valve 9.12 and lower contact 9.18.

The lower contact 9.18 of 9.1 lower end of direct circulation reversal valve is connect by screw thread with lower section oil pipe.

It is equipped with sealing ring 9.19 in the lower part of outer tube 9.13, the annulus space between salable tool and bushing pipe makes to seal Annular space below the annular space and sealing ring of 9.19 top of ring does not circulate.

The as shown in Figure 3 reacting cycle reversal valve 9.2 include top connection 9.21, outer tube 9.24, slide valve lever 9.23 and under connect First 9.210.The top connection 9.21 of the reacting cycle reversal valve 9.2 is connect by screw thread with top oil pipe, top connection 9.21, interior packet Include slide valve seat 9.22.The reacting cycle reversal valve 9.2 further includes central tube 9.26, is connect under 9.24 lower end of the outer tube connection Head, outer tube circumference uniform distribution open up at least three column connection runners 9.25；9.26 side wall of central tube opens up at least three column recirculation holes Battle array, each column recirculation hole battle array at least open up three recirculation holes 9.27, each column recirculation hole 9.27 with the connection runner of outer tube 9.25 correspond, and space is connected to the outer tube external space by being connected to runner 9.25 and recirculation hole 9.27 in central tube, and center Pipe 9.26 is fixedly and coaxially connected by being connected to runner 9.25 with outer tube 9.13；It include lower slide valve seat in the central tube 9.26 9.28, it is connected to 9.26 lower part of central tube；Annular space connection top connection 9.21 and lower contact are formed between the central tube and outer tube 9.210。

The slide valve lever 9.23 of the reacting cycle flushing valve 9.2 includes upper valve core 9.231, connecting rod 9.232 and bottom spool 9.233, wherein the connecting rod 9.232 and central tube 9.26 are coaxial, central tube is passed through, is slidingly sealed by sealing element.And it can It is moved up and down under upper and lower pressure differential, when fluid pressure is greater than 9.26 fluid pressure of central tube at lower contact 9.210 9.23 uplink of slide valve lever, upper valve core 9.231 are seated at the upper slide valve seat 9.22 of top connection, and upper slide valve is closed at this time, and lower slide valve is beaten It opens, lower contact 9.210 goes out fluid and enters central tube, comes 9.24 external space of outer tube by recirculation hole and communicating passage, works as center When pressure goes out pressure greater than lower contact 9.210 in pipe 9.26,9.23 downlink of slide valve lever, bottom spool 9.233 is seated at lower slide valve seat 9.28, descend slide valve to close at this time, upper slide valve is opened, and fluid is logical by the annular fiowpath of central tube and outer tube at lower contact 9.210 Cross top connection 9.21.

The lower contact 9.210 of 9.2 lower end of reacting cycle reversing valve is connect by screw thread with lower section oil pipe.Under outer tube 9.24 Portion is equipped with sealing ring 9.9, the annulus space between salable tool and bushing pipe 8, make the annular space of 9.9 top of sealing ring with it is close Annular space below seal ring does not circulate.When carrying out sand-flushing operation, after closing on sand washing position under sand-flushing pipe column, well mouth oil pipe Flushing fluid reversal valve 9c is connected, makes flushing fluid reversal valve 9c after continued access oil pipe 1c, lower drain line 1c on flushing fluid reversal valve 9c It arrives down in bushing pipe 8.

Connect flushing fluid reversal valve 9, which is positive, when carrying out the operation of direct circulation sand-flushing, on tubing string recycles reversal valve 9.1. Flushing fluid connects flushing fluid feed liquor pipeline by the nozzle of well-flushing threeway 4, and flushing fluid enters pit shaft by well-flushing threeway 4, simultaneously The flank nozzle connection rotary hose or steel pipeline of four-way junction of casing 6.Flushing fluid enters tubing string from well-flushing threeway 4.In bushing pipe 8 The upper annulus that bushing pipe 8 and direct circulation reversal valve 9.1 are formed is isolated in sealing ring 9.19 on direct circulation reversal valve 9.1.It manages at this time Flushing fluid in column is entered in central tube 9.14 by upper annulus by connection runner 9.16, recirculation hole 9.15.Due to central tube Pressure in 9.14 increases, to open lower check valve 9.17, flushing fluid is made to flow into lower section oil pipe 1.And upper check valve 9.12 Low pressure is greater than upper pressure, remains off at this time, to guarantee that upper end oil pipe 1c does not have pressure.Therefore, continuous punching Root canal column is descended in connection in the case of may be implemented in not termination of pumping no pressure when sand.Instantly after a complete oil pipe 1c, oil pipe upper end continues to connect Meet flushing fluid reversal valve 9b, reconnect oil pipe 1b, during oil pipe downlink sand washing, the direct circulation reversal valve 9.1 of new tripping in into Enter the working condition introduced before bushing pipe 8 enters, and the flushing fluid reversal valve 9c of tripping in front of deviates from bushing pipe 8 with oil pipe downlink. Sealing ring 9.19 does not work at this time, from oil pipe 10 stream come flushing fluid directly opens check valve 9.12 pass through outer tube 9.13 and Annular space between the 9.14 of central tube comes tool lower end, to flow into lower root oil pipe.And lower check valve 9.17 at this time, Since low pressure is greater than pressure in central upper portion pipe 9.14, so that lower check valve 9.17 remains off, therefore flushing fluid It can not be thence into central tube 9.14, to guarantee that flushing fluid will not flow out outside tubing string here.If there are also direct circulations to change for lower section Identical working condition can be still kept to valve 9.1.Sand cleaning fluid is returned from oil jacket annulus due to the direct circulation reversal valve in bushing pipe 8 The guarantee of sealing ring 9.19 on 9.1 can not be mixed into the flushing fluid that top enters well, keep load fluid empty by the annular of bushing pipe 8 and casing 10 Between flowed out by the four-way junction of casing 6 of well head.When needing to continue to make up a joint, continue to connect flushing fluid in the upper end oil pipe 1b of well head Reversal valve 9a and oil pipe 1a, to keep and the sand washing operation before consistent before continue.

When carrying out inverse circular sand washing adapter operation, connect flushing fluid reversal valve 9 is reacting cycle reversal valve 9.2 on tubing string.Casing The flank nozzle of four-way 6 connects flushing fluid feed liquor pipeline, and flushing fluid enters pit shaft by four-way junction of casing 6, while well-flushing threeway 4 Nozzle connects rotary hose or steel pipeline.Flushing fluid enters tubing string from the flank nozzle of four-way junction of casing 6, and flushing fluid passes through oil jacket ring Sky flows to shaft bottom, carries shaft bottom gravel and returns to tubing string.At this time the sealing ring 9.29 on the reacting cycle reversal valve 9.2 in bushing pipe 8 with Bushing pipe 8 isolates and independent upper annulus.Since the pressure in upper annulus is less than lower section oil overpressure, so that upstream is taken Sand liquid pushes slide valve lever 9.23 to move up, and lower slide valve seat 9.28 is opened, and upper slide valve seat 9.22 is closed, therefore load fluid enters central tube 9.26 enter upper annulus by recirculation hole 9.25, then flow out well head by well-flushing threeway 4.Due to being served as a contrast during sand washing operation The upper slide valve seat 9.22 of continuous inverse circular sand washing adapter tool 9 is in close state always in pipe 8, then 9.2 top of reacting cycle reversal valve Tubing string is constantly in pressure-less state, therefore can realize that no pressure not termination of pumping makes up a joint.Instantly after a complete oil pipe 1c, well head pipe Column continues to connect flushing fluid reversal valve 9b, and the root oil pipe 1b under the connection of the flushing fluid upper end reversal valve 9b.In tubing string downlink sand washing In the process, new tripping in reacting cycle reversal valve 9.2 enters bushing pipe 8, start more than working condition, and the flushing fluid in former bushing pipe 8 Reversal valve 9c downlink deviates from bushing pipe 8.Reacting cycle reversal valve 9.2 at this time due in oil jacket annulus sand cleaning fluid can pass through recirculation hole 9.25 enter central tube 9.26, so that pressure is greater than lower section oil overpressure in central tube 9.26 at this time, drive slide valve lever 9.23 It moves down, lower slide valve seat 9.28 is closed, and upper slide valve seat 9.22 is opened, therefore load fluid passes through the annular space of central tube and outer tube, passes through Upper slide valve seat 9.22 enters top oil pipe 1b.The reacting cycle reversal valve 9.2 of all abjection bushing pipes 8 makes in an identical manner simultaneously Load fluid passes through.

In the description of the present invention, it should be understood that temporald eixis or positional relationship are based on the figure Orientation or positional relationship is merely for convenience of description the utility model, rather than the device or element of indication or suggestion meaning must There must be specific orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.

While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art, It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.

Claims (6)

1. a kind of continuous sand flushing well-flushing tool, which is characterized in that including flushing fluid reversal valve, bushing pipe, the flushing fluid reversal valve Including direct circulation reversal valve, reacting cycle reversal valve, the direct circulation reversal valve, reacting cycle reversal valve are spaced apart from each other formula and are connected to oil Between pipe string, tubular column string is collectively formed, the liner hanger is put into wellhead casing pipe four-way, and liner hanger is fixed on well head On the hanger jackscrew of four-way junction of casing, the tubular column string is walked from top to bottom in bushing pipe.

2. a kind of continuous sand flushing well-flushing tool according to claim 1, which is characterized in that the direct circulation reversal valve includes Top connection, outer tube, lower contact, central tube, the interior top connection includes upper check valve, and the outer tube upper end connects top connection, under End connection lower contact, the central tube are located at outer tube, annular space, the central tube lower semisection are constituted between central tube and outer tube Check valve under interior setting, central tube upper end block, and central tube side wall opens up at least three column recirculation hole battle arrays, and each column recirculation hole battle array is extremely Three recirculation holes are opened up less, and the outer tube opens up connection runner, and connection runner is corresponding with the recirculation hole battle array on central tube, central tube Interior fluid is flowed on the outside of central tube by recirculation hole with runner is connected to, and is formed in annular space connection and is connect between the central tube and outer tube Head and lower contact.

3. a kind of continuous sand flushing well-flushing tool according to claim 2, which is characterized in that the outer wall lower part of the outer tube fills Annulus space equipped with sealing ring, between sealing ring energy seal well washing liquid reversal valve and bushing pipe.

4. a kind of continuous sand flushing well-flushing tool according to claim 1, which is characterized in that the reacting cycle reversal valve includes Top connection, outer tube, lower contact, central tube, slide valve lever, upper valve core, connecting rod, bottom spool, the top connection is interior to be arranged upper slide valve Seat, the outer tube upper end connect top connection, and lower end connects lower contact, and lower slide valve seat, institute is arranged in the central tube lower semisection inner wall It states central tube side wall and opens up at least three column recirculation hole battle arrays, each column recirculation hole battle array at least opens up three recirculation holes, the central tube Annular space is constituted between outer tube, the connecting rod upper end passes through central tube upper port, and central tube upper port and connecting rod are sliding Formula is tightly connected, and slide valve lever upper end connects upper valve core, and upper valve core is corresponding with upper valve base, and connecting rod lower end connects bottom spool, under Spool is corresponding with lower valve base, and slide valve lever moves up and down, and upper valve core can cooperate the opening and closing of upper valve base realization flow path, and bottom spool can match Close the opening and closing that lower valve base realizes flow path；The outer wall lower part of the outer tube is equipped with sealing ring, the commutation of sealing ring energy seal well washing liquid Annulus space between valve and bushing pipe.

5. a kind of continuous sand flushing well-flushing tool according to claim 1 or 2 or 3 or 4, which is characterized in that the well head set Pipe four-way upper end connects single ram type perventer, and single ram type perventer upper end connects well-flushing threeway.

6. a kind of continuous sand flushing well-flushing tool according to claim 5, which is characterized in that in the well-flushing threeway upper port Self-sealing rubber core is arranged in portion, and the upper surface of self-sealing rubber core is placed from sealed cover, uses flange connection from sealed cover and well-flushing threeway It is bolted, so that self-sealing rubber core be compressed.