CN208594929U - A kind of underground pump assembly and underground drain test macro - Google Patents

Abstract

This application discloses a kind of underground pump assembly and underground drain test macro, underground pump assembly includes the working string being made of oil pipe, pump seat and packer in tripping in down-hole casing, further includes the drain tubing string in tripping in working string；The packer is located at below the pump seat；The drain tubing string includes the pump core being seated in pump seat and the hollow rod for being connected to pump core top.The technical solution of the application can separate power fluid and formation fluid, and can realize downhole closing and heavy oil heating.

Description

A kind of underground pump assembly and underground drain test macro

Technical field

The present disclosure relates generally to oil well formation testing, the field of test technology, and in particular to using hydro powered, enclosed circulation Underground pump assembly and underground drain test macro.

Background technique

Currently, in oil/gas well formation testing, the field of test technology, stratum drain frequently with flowing back by hydraulic pump or screw pump drain, Wherein hydraulic pump mainly has hydraulic jet pump and hydraulic piston pump.

Currently used hydraulic pump, either jet pump or piston pump, working method are thrown in working string Enter pump core, working string should be at least made of from top to bottom oil pipe, pump seat and packer etc., and pump core is sent into well by ground face-pumping Under pump seat, then improve pump pressure, drive underground pump work, the ring by formation fluid together with power fluid between oil pipe and casing Ground is returned out in shape space (abbreviation oil-set annular space), after surface separation is measured, a part of mixed liquor is separated and is further used as moving Power liquid pump enters underground, drives underground pump work.From oil-set annular space pumping liquid when playing pump, returned out out of operation tubing, by pump core Go out well head.Namely pump and drain under direct circulation, reacting cycle play pump.This working method very simple, conveniently, so obtaining More universal application.But their common drawback is all that formation fluid and power fluid mix discharge, this is to the true of formation fluid The real bad judgement of fluidity.

Screw pump drain can get simple formation fluid, but torque limit due to sucker rod and screw rod and pump barrel it Between dynamic sealing leakage, jacking capacity is limited, is usually no more than the pressure difference of 10MPa.In addition, the application to heavy crude heat extraction also has Significant limitation.

Power fluid and formation fluid can be separated using hydraulic piston pump drain, that is, power fluid closed circulation, To separate power fluid and formation fluid, just it is necessary for power fluid and one circulation canal is provided again.Common practice is in big oil Next layer of little oil pipe again in pipe, forms concentric tube column, and piston pump pump core is put into little oil pipe and pumped by when drain takes a seat, after After the piston group of continuous pressurization transfer tube in-core moves back and forth, annular space of the weary power fluid between little oil pipe and Big Inch is returned Ground forms power fluid closed circulation.Then ground is discharged in the annular space between Big Inch and casing to formation fluid.It is needed when playing pump Pump core can be gone out well head by the annular space pumping liquid between little oil pipe and Big Inch.It is as miscellaneous in " petroleum machinery " in published On will the 7th phase in 2002 an article "The development and application of concentric tube column enclosed hydraulic piston pump " in introduce that Sample.

Above-mentioned concentric tube column enclosed hydraulic piston pump is mainly used for DP technology, to be used for formation testing, test drain is mainly deposited Following several respects the problem of:

First is that removing pump core out of central tube, it certainly will require central tube that there is enough interior latus rectums, if interior latus rectum is too small Then pump core will be smaller, not only increase the difficulty of processing of pump core in this way, and lifting rate certainly will also reduce.If 5¹/₂" casing Interior operation, central tube maximum can only select 2³/₈" oil pipe (internal diameter 50.8mm), outer tube maximum can only select 3¹/₂" oil pipe is (interior Diameter 76mm), the maximum outside diameter of pump core is no more than 50mm.Such 5¹/₂" casing operation most common 2⁷/₈" oil pipe is not all used, Need replacing all operation tubings, at high cost, poor universality.

Second is that across one layer of weary power fluid channel between power fluid channel and formation fluid channel, such as viscous crude, heated power The thermal energy of liquid, which cannot directly act on viscous crude, makes its thawing.That is formation fluid channel and power fluid channel be not close to unfavorable In the realization of heavy crude heat extraction.

Third is that pump core itself can not achieve downhole closing, do not have test function.

Summary of the invention

In view of drawbacks described above in the prior art or deficiency, being intended to provide one kind can separate power fluid and formation fluid, pump Core discharge capacity is big, it is at low cost, downhole closing can be facilitated and can realize underground pump assembly and the underground drain test system of heavy oil heating System.

In a first aspect, the application provides a kind of underground pump assembly, including in tripping in down-hole casing by oil pipe, pump seat and envelope Working string every device composition and the drain tubing string that is lowered into working string；The pump seat is located above the packer；Institute Stating drain tubing string includes the pump core being seated in pump seat and the hollow rod for being connected to pump core top.

According to technical solution provided by the embodiments of the present application, the pump seat includes outer cylinder and the sliding sleeve in outer cylinder；Institute The top for stating sliding sleeve is fixed with pawl；The pump core is externally provided with the pawl slot for blocking pawl；The outer tube inner wall is described The leave from office for being separately provided for the top fastening station for blocking the pawl of opening above and below sliding sleeve and being used to support sliding sleeve bottom end Rank offers sliding sleeve circulation port and outer cylinder circulation port, the sliding sleeve circulation port and outer cylinder circulation on the sliding sleeve and outer cylinder respectively Hole is aligned when the sliding sleeve is located at its lower dead point position, dead-centre position disposed thereon when be staggered.

According to technical solution provided by the embodiments of the present application, the bottom end of the pump core is equipped with pressure gauge.

According to technical solution provided by the embodiments of the present application, sand-proof pipe is provided with below the packer.

According to technical solution provided by the embodiments of the present application, the top of the pump core is provided with to be turned with what pump seat was tightly connected Changing-over head, the crossover sub is for the power fluid for entering pump core from hollow rod to be imported between pump core and pump seat The formation fluid extracted out out of pump core is simultaneously drained into being located between pump core and pump seat by annular space below crossover sub Annular space above crossover sub.

According to technical solution provided by the embodiments of the present application, the pump core includes lower piston cylinder, is located at below crossover sub Upper piston cylinder, the commutation pipe nipple between upper piston cylinder and lower piston cylinder, reversal valve, hollow connecting rod piston group and be fixed on The lower contact at lower piston cylinder bottom end；

The hollow connecting rod piston group include across it is described commutation pipe nipple hollow connecting rod and be connected to hollow connecting rod both ends And the upper piston and lower piston cooperated respectively with upper piston cylinder and lower piston cylinder dynamic sealing；On the upper piston and lower piston be Under penetrating hollow structure；The interior lower end of the crossover sub is provided with fixed valve；Shut-in valve is equipped in the lower contact；Institute It states and is equipped with travelling valve in upper piston；

The reversal valve, which can slide up and down to, to be arranged between commutation pipe nipple and the hollow connecting rod.

According to technical solution provided by the embodiments of the present application, the reversal valve be located at the commutation pipe nipple and hollow connecting rod it Between commutation it is intracavitary and will commutation chamber radial separations be power sap cavity and weary power sap cavity；The top of the commutation pipe nipple is provided with The power fluid flowed between pump seat and pump core is imported into the power fluid entrance of power sap cavity.

According to technical solution provided by the embodiments of the present application, the side wall of the commutation chamber is respectively arranged with connection from top to bottom To in upper piston cylinder upper piston chamber inlet, be communicated to outer cylinder circulation port weary power fluid outlet, be communicated in lower piston cylinder Lower piston chamber inlet；The middle part of the reversal valve radially offers commutation mouth；When the reversal valve is located at its lower limit site, The upper piston chamber inlet is directly connected with the power sap cavity, the weary power fluid outlet and lower piston chamber inlet simultaneously with Weary power sap cavity conducting；When reversal valve limit point disposed thereon, the lower piston chamber inlet by commutation mouth with it is described The conducting of power sap cavity, the weary power fluid outlet and upper piston chamber inlet are connected with weary power sap cavity simultaneously；

It is close to hollow connecting rod and is extended with spool upwards in the bottom of the commutation chamber；The reversal valve lower part insertion spool with Between commutation pipe nipple；Pressure transmission hole is provided between the bottom of the spool and the commutation pipe nipple；The spool is towards hollow company Bar side is provided with diversion trench in the middle part of face；The commutation pipe nipple is provided with below the spool to be connected to outer cylinder circulation port Relief hole；The upper portion side wall of the hollow connecting rod is provided with reversing groove, lower part is provided with a pair of adjacent lower reversing groove；

When the hollow connecting rod is located at its lower limit site location, the upper reversing groove is connected to the relief hole simultaneously and passes Press hole；

Boss and institute when hollow connecting rod limit point position disposed thereon, between two lower reversing grooves It is corresponding to state diversion trench, so that the pressure transmission hole is connected with the power sap cavity.

Second aspect, the application also provide a kind of underground drain test macro, including any one of the above underground pump assembly, Power fluid circulation and formation fluid metering system；The power fluid circulation includes providing to move in the hollow rod The power fluid holding vessel that the water injecting pump of power liquid, the annular chamber between casing and oil pipe are connected to；The formation fluid metering system packet Include the formation fluid holding vessel that the annular housing between hollow rod and oil pipe is connected to；The water injecting pump is stored up from the power fluid It deposits and extracts power fluid in tank.

According to technical solution provided by the embodiments of the present application, heating is provided between the power fluid fluid reservoir and water injecting pump Device.

The application by by the mating connections such as pump seat and oil pipe, packer formed working string, by hollow rod with The mode that pump core is directly connected to realizes one layer of oil pipe of tripping in casing and is formed power fluid input channel, power fluid row The closed loop channel in channel and formation fluid passing away out；The side of tripping in double layer oil pipe in casing in compared with the prior art Formula, the outer diameter of pump core can be accomplished bigger, so that the discharge capacity of pump core is bigger, difficulty of processing is smaller, life to reduce pump core Produce cost.

It according to technical solution provided by the embodiments of the present application, is designed, is realized and pump core using pawl type sliding sleeve in pump seat Linkage, when pump core is seated in sliding sleeve and is moved down by pressurizing urges sliding sleeve, the pawl on sliding sleeve is shunk, and is stuck in outside pump core In pawl slot, sliding sleeve and pump core is set to link, until bottom dead centre；The circulation canal on pump seat is opened, it can be achieved that drain function at this time Energy；Under normal conditions namely when pump core does not enter pump seat, the pawl on sliding sleeve is in open configuration and is made by top fastening station structure Sliding sleeve is maintained at upper dead center position, and the circulation canal on pump seat is closed at this time, and pump seat has all-pass and bearing capacity, can be with Various operations, such as perforation, test, acidification, pressure break operation are carried out to stratum.

The drain test macro of the application also has test function, after drain after a period of time, is needing to close production When liquid channel measures pressure recovery, power fluid circulation canal can be closed, then be suppressed from formation fluid channel, make the pass in pump core Well valve is in reversed pressurized state and keeps, and shut-in valve equally blocks formation fluid channel as a plug at this time, realizes well Lower closing well, pressure gauge will record the pressure, temperature variation of entire drain test process.

The drain test macro of the application in such a way that power fluid channel and weary power fluid channel surround formation fluid channel, It applies in thickened oil recovery, the heating to viscous crude can be realized by way of heating to power fluid.

Detailed description of the invention

By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other Feature, objects and advantages will become more apparent upon:

Fig. 1 is the structural schematic diagram of the first embodiment in the application；

Fig. 2 is the structural schematic diagram of pump seat before pump core is taken a seat；

Fig. 3 is the structural schematic diagram of pump seat after pump core is taken a seat；

Fig. 4 is the structural schematic diagram of the crossover sub on pump core top；

The structural schematic diagram of pump core when Fig. 5 is hollow connecting rod dead-centre position disposed thereon；

Fig. 6 is the structural schematic diagram of pump core when hollow connecting rod is located at its lower dead point position；

Fig. 7 is the structural schematic diagram of hollow connecting rod piston group in the application；

Fig. 8 is the structural schematic diagram of commutation pipe nipple when hollow connecting rod is located at its lower dead point position；

Commutate the structural schematic diagram of pipe nipple when Fig. 9 is hollow connecting rod dead-centre position disposed thereon；

Figure 10 is the structural schematic diagram of drain test macro in underground in the application.

Figure label:

10, casing；20, working string；30, drain tubing string；40, power fluid circulation；70, oil pipe threeway；60, oily Pipe hanger；

21, pump seat；22, oil pipe；23, packer；24, sliding sleeve；25, pawl；26, outer cylinder circulation port；27, sliding sleeve recycles Hole；28, outer cylinder；31, pump core；32, hollow rod；33, pawl slot；34, crossover sub；35, pressure gauge；41, water injecting pump； 42, power fluid holding vessel；51, formation fluid holding vessel；

31-2, upper piston cylinder；31-3, lower piston cylinder；31-4, hollow connecting rod；31-5, commutation pipe nipple；31-6, reversal valve； 31-7, fixed valve；31-8, shut-in valve；31-9, travelling valve；31-10, lower contact；

34-1, upper cylindrical section；34-2, lower cylindrical section；34-3, convergence part；34-4, the first tilt port；34-5, the second inclination Mouthful；

31-4-1, upper reversing groove；31-4-2, lower reversing groove；31-4-3, upper piston；31-4-4, lower piston；

31-5-1, power sap cavity；31-5-2, weary power sap cavity；31-5-3, power fluid entrance；31-5-4, upper piston room enter Mouthful；31-5-5, weary power fluid outlet；31-5-6, lower piston chamber inlet；

31-5-7, spool；31-5-8, pressure transmission hole；31-5-9, relief hole；31-5-7-1, diversion trench；

31-6-1, commutation mouth.

Specific embodiment

The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order to Convenient for description, part relevant to invention is illustrated only in attached drawing.

It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

Please referring to Fig. 1 is a kind of a kind of structural schematic diagram of embodiment of underground pump assembly of the application, including lower going-into-well is trapped The drain tubing string in the working string 20 and tripping in working string 20 being made of oil pipe 22, pump seat 21, packer 23 in pipe 10 30；The pump seat 21 is located at the top of the packer 23；The drain tubing string 30 includes 31 He of pump core being seated in pump seat 21 It is connected to the hollow rod 32 on 31 top of pump core.The upper and lower ends of above-mentioned pump seat 21 are respectively equipped with female thread and pin thread, so as to Oil pipe or other tool screwed connections of going into the well.

When field operation, first by designed working string 20 in order tripping in construction wellbore casing 10 in, and will envelope It sets every device 23 in underground predetermined position；Again by 30 tripping in working string 20 of drain tubing string when needing drain, so that pump core 31 It sits in pump seat 21；When drain, power fluid enters out of hollow rod 32, and the power moved back and forth, pump are provided to pump core 31 Annular space discharge of the formation fluid that core 31 is pumped from underground between hollow rod 32 and oil pipe 22, the weary of pump core 31 are moved Annular space discharge of the power liquid between oil pipe 22 and casing 10；Preferably, pressure gauge 35 can be connected in the bottom end of pump core 31, Pressure gauge 35 is removed with drain tubing string 30 to underground, for the pressure, temperature variation under monitoring well at any time.

In the above-described embodiments, such as casing 10 is 5¹/₂" casing, oil pipe 32 are common 2⁷/₈" pipe aperture 62mm, Then the outer diameter of pump core can accomplish 58~60mm in the present embodiment, and one-shot discharge capacity is improved than 50mm concentric tube column hydraulic piston pump 50% or so.

For prevent formation sand production enter produce liquid channel drain is adversely affected, can in working string 20 packer Sand-proof pipe is arranged in 23 lower sections, to prevent the mechanical admixtures such as reservoir sand from entering inside working string.

Above-mentioned power fluid can be clear water or add some lubricants in clear water and is made, and preparation is very convenient, at low cost.

Preferably, the pump seat 21 includes outer cylinder 28 and sliding sleeve 24；The top of the sliding sleeve 24 is fixed with pawl 25；It is described Pump core 31 is externally provided with the pawl slot 33 for blocking pawl 25；28 inner wall of outer cylinder divides above and below the sliding sleeve 24 It is not provided with the top fastening station of the pawl for blocking opening and is used to support getting out of a predicament or an embarrassing situation for 24 bottom end of sliding sleeve, the sliding sleeve 24 and outer Sliding sleeve circulation port 27 and outer cylinder circulation port 26 are offered respectively on cylinder 28, and the sliding sleeve circulation port 27 and outer cylinder circulation port 26 are in institute It states when sliding sleeve 24 is located at its lower dead point position and to be staggered when alignment, dead-centre position disposed thereon.

As shown in Fig. 2, sliding sleeve 24 is in its upper dead center position when pump core 31 is not seated in, the outer cylinder of outer cylinder 28 is recycled at this time Hole 26 is staggered with the sliding sleeve circulation port 27 on sliding sleeve 24, and outer cylinder 28 is closed, while the pawl 25 on sliding sleeve 24 is in and opens shape State makes sliding sleeve 24 keep dead-centre position on it.As shown in figure 3, when pump core 31 is seated in pump seat 21 with drain tubing string 30, it is sliding Pawl 25 on set 24 is aligned with the pawl slot 33 of pump core 31, and when being moved down by pressurizing urges sliding sleeve 24, pawl 25 is shunk, Sliding sleeve 24 and pump core 31 is set to link, until the bottom end of sliding sleeve 24 reaches its lower dead point position.Outer cylinder circulation on outer cylinder 28 at this time Hole 26 is aligned with the sliding sleeve circulation port 27 on sliding sleeve 24, and the circulation canal of pump seat 21 is opened, and weary power fluid can be thence into Annular space between oil pipe 22 and casing 10 realizes power fluid circulation.

When playing out pump core 31 after drain, by, with upward lifting force, being pumped due to being seated in 30 top of drain pipe column The pawl 25 on sliding sleeve 24 when core 31 in pump seat 21 has been shunk, and has been stuck in the pawl slot 33 of 31 outside of pump core and has been formed with pump core Then linkage discharges so the sliding sleeve 24 when acting pump core 31 in pump seat 21 will also return to the position of top fastening station in company with pump core 31 Pump core 31, pump core 31 are removed, thus by the circulation canal close synchronously on pump seat 21, the all-pass for the tubing string 20 that resumes operation and Bearing capacity can also carry out other any operations.

As shown in figure 4, preferably: the top of the pump core 31 is provided with the crossover sub 34 being tightly connected with pump seat 21, The crossover sub 34 be used to for the power fluid for entering pump core 31 from hollow rod 32 importeding into pump core 31 and pump seat 21 it Between the annular space for being located at the lower section of crossover sub 34 and the formation fluid extracted out out of pump core 31 is drained into pump core 31 and pump seat The annular space for being located at 34 top of crossover sub between 21.The crossover sub 34 includes upper cylindrical section 34-1, lower cylindrical section The 34-2 and convergence part 34-3 being connected between upper cylindrical section 34-1 and lower cylindrical section 34-2；The convergence part 34-3 outwardly protrude with Pump seat 21 is tightly connected, so that the annular space between pump core 31 and pump seat 21 is separated into two parts up and down；The convergence part The first tilt port 34-4 and the second tilt port 34-5 is equipped in 34-3；The power fluid entered out of hollow rod 32 passes through first Tilt port 34-4 is transferred into the annular space being located at below the 34-3 of convergence part between pump core 31 and pump seat 21, and by pump core 31 The formation fluid of interior extraction is drained into being located above the 34-3 of convergence part between pump core 31 and pump seat 21 by the second tilt port 34-5 Annular space.

As shown in Figure 5 and Figure 6, the pump core 31 includes crossover sub 34, upper piston cylinder 31-2, lower piston cylinder 31-3, changes To valve 31-6, hollow connecting rod piston group, the commutation pipe nipple 31-5 being connected between upper piston cylinder 31-2 and lower piston cylinder 31-3, The lower contact 31-10 being fixed below lower piston cylinder 31-3；

As shown in fig. 7, the hollow connecting rod piston group include across it is described commutation pipe nipple 31-5 hollow connecting rod 31-4 and The upper piston 31- for being connected to the both ends hollow connecting rod 31-4 and cooperating respectively with upper piston cylinder 31-2 and lower piston cylinder 31-3 dynamic sealing 4-3 and lower piston 31-4-4；The hollow connecting rod piston group can move back and forth in upper and lower two-piston cylinder；The upper piston 31- 4-3 and lower piston 31-4-4 is transparent hollow structure；The reversal valve 31-6, which can slide up and down to, to be arranged described In cavity between hollow connecting rod 31-4 and commutation pipe nipple 31-5；

As shown in Figure 5 and Figure 6, the interior lower end of the crossover sub 34 is provided with fixed valve 31-7；The lower contact Shut-in valve 31-8 is equipped in 31-10；Travelling valve 31-9 is equipped in the upper piston 31-4-3.

The fixed valve 31-7, travelling valve 31-9 and shut-in valve 31-8 are check valves, and formation fluid can only be upwardly through upper Check valve is stated, and cannot be passed downwardly through；When hollow connecting rod piston group moves upwards, travelling valve 31-9 is closed, fixed valve 31-7 It opens, the formation fluid above upper piston 31-4-3 is given rise to the top of fixed valve 31-7, hence into hollow rod Annular space between 32 and oil pipe 22；When hollow connecting rod piston group moves downward, fixed valve 31-7 closing, travelling valve 31-9 is opened, and formation fluid is entered above upper piston by travelling valve 31-9, repeatedly can continuously lift formation fluid To ground, shut-in valve 31-8 is constantly in opening state in this discharge opeing process.

As shown in Figure 8 and Figure 9, the reversal valve 31-6 is between the commutation pipe nipple 31-5 and hollow connecting rod 31-4 It commutates intracavitary and is power sap cavity 31-5-1 and weary power sap cavity 31-5-2 by commutation chamber radial separations；The commutation pipe nipple 31- 5 top is provided with the power fluid that the power fluid flowed between pump seat 21 and pump core 31 is imported into power sap cavity 31-5-1 Entrance 31-5-3.

The side wall of the commutation chamber is respectively arranged with the upper piston chamber inlet being communicated in upper piston cylinder 31-2 from top to bottom 31-5-4, the weary power fluid outlet 31-5-5 for being communicated to outer cylinder circulation port 26, the lower piston being communicated in lower piston cylinder 31-3 Chamber inlet 31-5-6；The middle part of the reversal valve 31-6 radially offers commutation mouth 31-6-1；As shown in fig. 7, working as the commutation When valve 31-6 is located at its lower limit site, the upper piston chamber inlet 31-5-4 is directly connected with the power sap cavity 31-5-1, institute It states weary power fluid outlet 31-5-5 and lower piston chamber inlet 31-5-6 while being connected with weary power sap cavity 31-5-2；Such as Fig. 8 institute Show, when reversal valve 31-6 limit point disposed thereon, the lower piston chamber inlet 31-5-6 by commutation mouth 31-6-1 with Power sap cavity 31-5-1 conducting, the weary power fluid outlet 31-5-5 and upper piston chamber inlet 31-5-4 simultaneously with it is weary Power sap cavity 31-5-2 conducting；

It is close to hollow connecting rod 31-4 and is extended with spool 31-5-7 upwards in the bottom of the commutation chamber；The reversal valve 31-6's Lower part is inserted between spool 31-5-7 and commutation pipe nipple 31-5；The bottom of the spool 31-5-7 and the commutation pipe nipple 31-5 it Between be provided with pressure transmission hole 31-5-8；The spool 31-5-7 is towards being provided with diversion trench 31- in the middle part of the side hollow connecting rod 31-4 5-7-1；The commutation pipe nipple 31-5 is provided with the relief hole being connected to outer cylinder circulation port 26 below the spool 31-5-7 31-5-9；As shown in fig. 7, the upper portion side wall of the hollow connecting rod 31-4 is provided with reversing groove 31-4-1, lower part is provided with one To adjacent lower reversing groove 31-4-2；

As shown in figure 8, the upper reversing groove 31-4-1 is same when the hollow connecting rod 31-4 is located at its lower limit site location Relief hole 31-5-9 described in Shi Liantong and pressure transmission hole 31-5-8；

As shown in figure 9, when the limit point position disposed thereon the hollow connecting rod 31-4, two lower reversing groove 31- Boss between 4-2 is corresponding with the diversion trench 31-5-7-1, so that the pressure transmission hole 31-5-8 and the power Sap cavity 31-5-1 conducting.

As shown in Fig. 4~Fig. 9, the power fluid being pumped into out of hollow rod passes through the convergence part 34-3 of crossover sub 34 The first interior tilt port 34-4 is entered between pump core 31 and pump seat 21 in annular chamber.Then pass through the commutation pipe nipple in pump core 31 The power fluid entrance 31-5-3 of 31-5 is entered in power sap cavity 31-5-1；

As shown in figure 8, when the reversal valve 31-6 is in lower limit site, the upper piston chamber inlet 31-5-4 directly with The power sap cavity 31-5-1 connection, power fluid are entered in upper piston cylinder 31-2 by upper piston chamber inlet 31-5-4, are pushed Hollow connecting rod piston group moves upwards, and the pressure in lower piston cylinder 31-3 reduces, and down-hole pressure pushes shut-in valve 31-8 to open, ground Layer liquid is inhaled into lower piston cylinder, at this point, making travelling valve since the intracavitary pressure of the formation fluid of upper piston cylinder 31-2 increases 31-9 is closed, and fixed valve 31-7 is opened, and the formation fluid intracavitary positioned at the formation fluid of upper piston cylinder 31-2 is discharged from fixed valve 31-7； The weary power fluid outlet 31-5-5 and lower piston chamber inlet 31-5-6 is connected with weary power sap cavity 31-5-2 simultaneously simultaneously； Weary power fluid in lower piston cylinder 31-3 pass sequentially through lower piston chamber inlet 31-5-6, weary power fluid outlet 31-5-5 and Outer cylinder circulation port 26 is discharged, and enters the annular space between pump seat 21 and casing 10.

As shown in figs. 5 and 9, when hollow connecting rod piston group moves to upper dead center position, two lower reversing groove 31- Boss between 4-2 is corresponding with the diversion trench 31-5-7-1, so that the pressure transmission hole 31-5-8 and the power Sap cavity 31-5-1 conducting, high voltage power liquid act on the bottom of reversal valve 31-6 simultaneously, and reversal valve is pushed to be moved upwards up to the upper limit Site location.At this point, the lower piston chamber inlet 31-5-6 is led by the mouth 31-6-1 and power sap cavity 31-5-1 that commutates Logical, power fluid is intracavitary by the power fluid that lower piston chamber inlet 31-5-6 enters lower piston cylinder 31-3, pushes hollow connecting rod living Plug group moves downward；Fixed valve 31-7 is closed at this time, and travelling valve 31-9 is opened, and formation fluid passes through the center of hollow connecting rod piston group The formation fluid that hole is inhaled into upper piston cylinder 31-2 is intracavitary.The weary power fluid outlet 31-5-5 and upper piston chamber inlet simultaneously 31-5-4 is connected with weary power sap cavity 31-5-2 simultaneously, and the weary power fluid intracavitary positioned at the power fluid of upper piston cylinder 31-2 successively leads to It crosses upper piston chamber inlet 31-5-4, weary power fluid outlet 31-5-5 and outer cylinder circulation port 26 is discharged, enter pump seat 21 and set Annular space between pipe 10.

As shown in Figure 6 and Figure 8, when hollow connecting rod piston group moves to lower dead point position, the upper reversing groove 31-4-1 The relief hole 31-5-9 is connected to pressure transmission hole 31-5-8；So that the bottom pressure release of reversal valve 31-6, reversal valve 31-6 and quilt It back into lower limit site location；At this point, power fluid enters upper piston cylinder again, hollow connecting rod piston group is pushed to move upwards.Such as Formation fluid can back and forth be given rise to ground by this.

It is as shown in Figure 10 a kind of structural schematic diagram of underground drain test macro of the application, which includes Any one of the above underground pump assembly, power fluid circulation 40 and formation fluid metering system；Power fluid circulation 40 and ground Layer liquid metering system is located at ground；The power fluid circulation 40 includes providing power fluid in the hollow rod 32 The power fluid holding vessel 42 that water injecting pump 41, the annular chamber between casing 10 and oil pipe 22 are connected to；The formation fluid metering system The formation fluid holding vessel 51 being connected to including the annular housing between hollow rod 32 and oil pipe 22；The water injecting pump 41 is from institute It states and extracts power fluid in power fluid holding vessel 42.Those skilled in the art is according to common sense it is found that above-mentioned underground drain test system The valve for connecting the pipeline of each system and component and being mounted on pipeline is additionally provided in system.

When field operation, first by designed working string 20, tripping in is constructed in wellbore in order, and packer 23 is sat It is enclosed in underground predetermined position, and seated tubing hanger 60, connected pipes threeway 70.Various operations can be carried out to target zone at this time, Such as perforation, acidification, pressure break.

Again by drain tubing string 30 in order tripping in working string 20 when needing drain, and pump core 21 is made to be seated in pump seat 31, The circulation canal on pump seat 31 is opened by the decentralization pressurization of drain tubing string 30, reconnects active power fluid circulation 40 and stratum Liquid metering system.Then start water injecting pump 41, power fluid is transported to pump core 21 by hollow rod, drives the sky in pump core 21 Heart connecting rod piston group moves back and forth, and formation fluid is given rise to ground by the annular space between hollow rod 32 and oil pipe 22 It separated, measured.Weary power fluid then passes through the annular space between oil pipe 22 and casing 10 and returns to power fluid fluid reservoir 42, Water injecting pump pressurization is entered back into after filtering, forms power fluid closed circulation, driving underground pump piston group ceaselessly moves back and forth, from And formation fluid is constantly given rise into ground.

When needing closing well, shut-in valve 31-8 can be made to be in reversed pressurized state from producing liquid channel and suppressing, so that it may keep production liquid logical Road is shut, thus realize downhole closing, it is easy to operate.

Preferably, heating device is provided between the power fluid fluid reservoir 41 and water injecting pump 42.If it is heavy oil wells, then Heating device, such as heating furnace are being set between power fluid fluid reservoir 41 and water injecting pump 42 in power fluid circulation 40, will moved Power liquid is heated to be pumped into underground out of hollow rod 32 again after certain temperature, in this way, the heat that hollow rod 32 distributes will Directly melt viscous crude, to be able to smooth drain.The heating temperature of power fluid, which is subject to, can be such that viscous crude melts.

Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature Any combination and the other technical solutions formed.Such as features described above and (but being not limited to) disclosed herein have it is similar The technical characteristic of function is replaced mutually and the technical solution that is formed.

Claims (7)

1. a kind of underground pump assembly, it is characterised in that: including in tripping in down-hole casing (10) by oil pipe (22), pump seat (21) and The working string (20) of packer (23) composition, further includes the drain tubing string (30) being lowered into working string (20)；The envelope It is located at the lower section of the pump seat (21) every device (23)；The drain tubing string (30) include the pump core (31) that is seated in pump seat (21) and It is connected to the hollow rod (32) on pump core (31) top.

2. underground pump assembly according to claim 1, it is characterised in that: the pump seat (21) includes outer cylinder (28) and is located at Sliding sleeve (24) in outer cylinder (28)；The top of the sliding sleeve (24) is fixed with pawl (25)；The pump core (31), which is externally provided with, to be used for Block the pawl slot (33) of pawl (25)；Outer cylinder (28) inner wall is respectively arranged with above and below the sliding sleeve (24) For blocking the top fastening station of the pawl of opening and being used to support getting out of a predicament or an embarrassing situation for sliding sleeve (24) bottom end, the sliding sleeve (24) and outer cylinder (28) sliding sleeve circulation port (27) and outer cylinder circulation port (26), the sliding sleeve circulation port (27) and outer cylinder circulation port are offered on respectively (26) it is staggered when alignment, dead-centre position disposed thereon when the sliding sleeve (24) is located at its lower dead point position.

3. underground pump assembly according to claim 1 or 2, it is characterised in that: the bottom end of the pump core (31) is equipped with pressure Power meter (35).

4. underground pump assembly according to claim 1 or 2, it is characterised in that: be provided with below the packer (23) Sand-proof pipe.

5. underground pump assembly according to claim 1 or 2, it is characterised in that: the top of the pump core (31) be provided with The crossover sub (34) that pump seat (21) is tightly connected, the crossover sub (34) will be for that will enter pump from hollow rod (32) The power fluid of core (31) imported into the annular space, simultaneously being located at below crossover sub (34) between pump core (31) and pump seat (21) The formation fluid extracted out out of pump core (31) is drained into being located above crossover sub (34) between pump core (31) and pump seat (21) Annular space.

6. a kind of underground drain test macro, which is characterized in that including underground pump assembly described in any one of claim 1 to 5, Power fluid circulation (40) and formation fluid metering system；The power fluid circulation (40) includes toward the hollow rod (32) the power fluid storage that water injecting pump (41), the annular chamber between casing (10) and oil pipe (22) of power fluid are connected to is provided in Tank (42)；The formation fluid metering system includes the ground that the annular housing between hollow rod (32) and oil pipe (22) is connected to Layer liquid holding vessel (51)；The water injecting pump (41) extracts power fluid out of described power fluid holding vessel (42).

7. drain test macro in underground according to claim 6, which is characterized in that the power fluid holding vessel (42) and note Water pump is provided with heating device between (41).