CN210134827U - Slurry replacing, leakage testing and liquid discharging integrated device for oil pipe - Google Patents

Abstract

The utility model discloses a slurry replacing, leakage testing and liquid discharging integrated device for an oil pipe, which is arranged below the oil pipe, the utility model comprises an outer tube, a limit tube, a sliding sleeve, a ball seat and a sealing ball, wherein the limit tube is fixed in the outer tube, the sliding sleeve can be arranged in the outer tube in an upward and unidirectional sliding way, the sliding sleeve is connected with the limit tube through a backstop clamping groove, the sliding sleeve is connected with the outer tube through a breakable first connecting piece, the bottom of the sliding sleeve is connected with a thin punching tube, the ball seat is provided with a through hole for communicating the oil tube and the thin punching tube, the ball seat is arranged at the inner side of the sliding sleeve, and is connected with the outer tube and the limit tube through a second connecting piece, the through hole is sealed through a sealing ball in the leakage checking process, the diameter of the sealing ball is larger than the inner diameter of the sliding sleeve, when the first connecting piece is disconnected, the sliding sleeve slides upwards to jack up the sealing ball, the sealing ball is separated from the ball seat, and the oil pipe is communicated with the fine flushing pipe through the through hole. The utility model provides a replace thick liquid and test complicated loaded down with trivial details, the technical problem that wastes time and energy, security are low of hourglass work.

Description

Slurry replacing, leakage testing and liquid discharging integrated device for oil pipe

Technical Field

The utility model relates to an oil gas exploitation technical field especially relates to an oil pipe is with replacing thick liquid, examining hourglass and flowing back integrated device.

Background

In some oil fields (such as Liaohe oil fields) in China, reservoirs are mostly loose sandstone oil and gas reservoirs, the problem of sand production is serious, necessary sand control measures are needed in the production process, gravel packing and fracturing sand control are used as common sand control means at the present stage, the sand production problem of fine silt sand can be effectively controlled, and the gravel packing and fracturing sand control processes are increasingly applied, but slurry replacement and leakage check of oil pipes are needed to be carried out respectively, and certain inconvenience is brought to the work.

As shown in fig. 1, since the casing 901 of the newly drilled well is filled with mud, a slurry replacement operation must be performed before gravel packing or fracturing sand control operations are performed. During gravel packing or fracturing sand control operation, the packing tool 904 is arranged at the bottom of the screen pipe 903 through the casing 901 and is lowered into the bottom of the well along with the screen pipe 903, the slurry replacing pipe is connected to the bottom of the oil pipe 902, the fine flushing pipe 905 is arranged at the bottom of the slurry replacing pipe, the fine flushing pipe 905 can conveniently extend into the packing tool 904 through the fine flushing pipe 905, and mud in the packing tool 904 is replaced, so that the purpose of completely replacing slurry is achieved.

As shown in fig. 2, since gravel packing or fracturing sand control operations require high pressure pumping of sand-carrying fluid and gravel into the oil pipe 902, in order to ensure the safety of the oil pipe 902, a leak testing operation needs to be performed on the oil pipe 902 before the construction operation. The method for detecting the leakage adopted at the present stage is simple, namely a ball seat 906 is fixed in an oil pipe 902 by a shear pin, a nipple 907 with the inner diameter larger than that of the oil pipe 902 is connected below the oil pipe 902, a steel ball 908 is thrown into the oil pipe 902 from the ground during leakage detection, the steel ball 908 falls onto the ball seat 906, clear water is pumped into the oil pipe 902 from the ground at the moment, the steel ball 908 and the ball seat 906 block the clear water to flow downwards, the pressure in the oil pipe 902 above the ball seat 906 is increased, a certain pressure value (15Mpa) is kept not to fall within a certain time (5-10 minutes), and the oil pipe 902 can be considered to be qualified in leakage detection. After the leakage is detected to be qualified, clear water is continuously pumped into the oil pipe 902 to increase the pressure, when the pressure is greater than the shearing strength (20Mpa) of the shearing pin, the shearing pin is cut off, the ball seat 906 falls onto the retaining ring 909 in the nipple 907 and is received by the retaining ring 909, so that the oil pipe 902 is communicated up and down, and the oil pipe 902 can be lifted after the construction is finished.

However, in the slurry replacing and leakage testing process at the present stage, some problems need to be solved:

slurry replacement and leakage detection are used as necessary links for gravel packing and fracturing sand prevention of a new well, the oil pipe 902 needs to be pulled down twice, the operation cost is high, the operation time is long, and time and labor are wasted;

secondly, the pressure of 15MPa is required to be kept for 5-10 min for leakage detection of the oil pipe 902, the shearing strength of the shearing pin must be larger than 15MPa even about 20MPa in order to avoid mistaken cutting of the shearing pin in the process, and the pressure of 20MPa is higher in the pressurizing process, so that potential safety hazards exist;

thirdly, at oil pipe 902's the in-process of leaking hunting, if can't cut off because special problem appears in the shear pin, oil pipe 902's interior unable and outside intercommunication, inside can be full of drilling fluid when playing out oil pipe 902, has not only increaseed the degree of difficulty of playing out oil pipe 902, can cause the pollution to the ground environment moreover.

Aiming at the problems of complicated and tedious pulp replacing and leakage testing work, time and labor waste and low safety in the related technology, an effective solution is not provided at present.

Therefore, the inventor provides an integrated slurry replacing, leakage testing and liquid discharging device for an oil pipe by virtue of experience and practice of related industries for many years so as to overcome the defects in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an oil pipe is with replacing thick liquid, test hourglass and flowing back integrated device, disposable completion is tested hourglass and is replaced thick liquid work, need not to go into the tubular column down many times, the construction procedure has been saved, the operating cost is reduced, replace thick liquid and test after leaking work, can play out oil pipe's follow-up work through cutting off the shearing pin, the potential safety hazard that pressure caused has not only been avoided squeezing into through the pump truck, the tubular column that appears unable disconnection when having avoided adopting to suppress formula shearing pin and bring plays out the condition of difficulty, and play out oil pipe and discharge the liquid in the oil pipe before the oil pipe, the security improves greatly, the excessive pollution to ground environment of drilling fluid has effectively been prevented.

The purpose of the utility model can be realized by adopting the following technical scheme:

the utility model provides an oil pipe is with replacing thick liquid, examining hourglass and flowing back integrated device sets up in oil pipe's below, and follows oil pipe stretches into to the cover intraductal, and this oil pipe is with replacing thick liquid, examining hourglass and flowing back integrated device and includes:

the top of the outer pipe is connected with the bottom of the oil pipe;

the limiting pipe is fixedly arranged in the outer pipe;

the sliding sleeve can be arranged in the outer pipe in an upward one-way sliding manner, the outer wall of the upper part of the sliding sleeve is matched and connected with the inner wall of the limiting pipe through a backstop clamping groove, the outer wall of the lower part of the sliding sleeve is connected with the side wall of the outer pipe through a first connecting piece which can be disconnected, and the bottom of the sliding sleeve is connected with a fine punching pipe matched with a filling tool which is preset in the sleeve;

the ball seat is provided with a through hole for communicating the oil pipe with the fine flushing pipe, the ball seat is positioned on the inner side of the sliding sleeve, the top surface of the ball seat is not lower than that of the sliding sleeve, and the ball seat is connected with the outer pipe and the limiting pipe through a second connecting piece; and

the sealing ball is placed at the top end of the through hole in the leakage checking process and is sealed with the through hole, the diameter of the sealing ball is larger than the inner diameter of the sliding sleeve, when the first connecting piece is disconnected, the sliding sleeve slides upwards and jacks up the sealing ball, the sealing ball is separated from the ball seat, and the oil pipe is communicated with the fine flushing pipe through the through hole.

The utility model discloses an in a preferred embodiment, the outer tube with spacing pipe is the tubular structure, the inner wall of outer tube with the outer wall of spacing pipe is laminated mutually, the outer tube with connect through the screw thread between the spacing pipe.

The utility model discloses an in a preferred embodiment, the upper portion of sliding sleeve is for dividing the claw structure, divide the claw structure to go up and seted up a plurality of storage tanks along circumference, the storage tank is for following the rectangular form logical groove that vertical direction set up, the one end of second connecting piece respectively with spacing pipe with the lateral wall of outer tube is connected, the other end of second connecting piece passes the storage tank and with the outer wall connection of ball seat.

In a preferred embodiment of the present invention, the second connecting member is a fixing pin.

The utility model discloses an in a preferred embodiment, the ball seat is the tubular structure, the outer wall of ball seat with the inner wall of sliding sleeve is laminated mutually, the outer wall of ball seat with be provided with a plurality of first sealing washers between the inner wall of sliding sleeve.

The utility model discloses an in a preferred embodiment, be provided with spacing boss on the lower part outer wall of sliding sleeve, the sliding sleeve upwards slides to highest position, the top surface of spacing boss with the bottom edge of spacing pipe offsets.

The utility model discloses an in a preferred embodiment, the outer wall of spacing boss with the inner wall of outer tube is laminated mutually, the outer wall of spacing boss with be provided with a plurality of second sealing washers between the inner wall of outer tube.

In a preferred embodiment of the present invention, the top surface of the limiting boss is an inclined surface matched with the bottom edge of the limiting pipe.

The utility model discloses an in a preferred embodiment, first connecting piece is the shear pin, the one end of shear pin with the lateral wall of outer tube is connected, the other end of shear pin with the outer wall connection of spacing boss.

In a preferred embodiment of the present invention, the top of the outer tube is provided with a connection screw thread matched with the oil tube, and the outer tube is connected with the oil tube through the screw thread.

From top to bottom, the utility model discloses oil pipe is with replacing thick liquid, examining hourglass and flowing back integrated device's characteristics and advantage are: the utility model discloses an oil pipe is with replacing thick liquid, test hourglass and flowing back integrated device sets up in oil pipe's below, and stretch into to the sleeve pipe along with oil pipe, spacing pipe is fixed to be set up in the outer tube, connect through stopping draw-in groove cooperation between sliding sleeve and the spacing pipe, so that the sliding sleeve can upwards one-way slip in the outer tube, connect through first connecting piece between sliding sleeve and the outer tube, the bottom of sliding sleeve is connected with thin towards the pipe, the ball seat is fixed in the inside of outer tube, set up the through-hole that communicates oil pipe and thin towards the pipe on the ball seat, the ball seat is located the inboard of sliding sleeve, when carrying out and replacing thick liquid operation, let in the clear water to oil pipe, the clear water can replace mud to ground through thin towards the; when the leakage detection operation is carried out, the sealing ball is put into the outer tube, the sealing ball seals the through hole on the ball seat, clear water is pumped into the outer tube, the pressure in the outer tube is increased and is kept for a certain time, and then the leakage detection work can be completed; when the pipe lifting operation is carried out, the first connecting piece is disconnected, because the diameter of the sealing ball is larger than the inner diameter of the sliding sleeve, the sliding sleeve slides upwards and jacks up the sealing ball, the sealing ball is separated from the ball seat, clear water in the oil pipe enters the thin flushing pipe through the through hole and is discharged outwards through the thin flushing pipe, the pollution of liquid in the oil pipe to the ground is prevented, in the utility model, the leakage detection and slurry replacement work can be completed once without putting the pipe column down for many times, the construction procedure is saved, the operation cost is reduced, after the slurry replacement and leakage detection work is completed, the subsequent work of lifting the oil pipe can be carried out by cutting off the shearing pin, the potential safety hazard caused by the pressure of a pump truck is avoided, the situation that the pipe column cannot be disconnected to bring about the difficulty in lifting is avoided when the pressing type shearing pin is adopted, the liquid in the oil pipe is discharged before the oil pipe is lifted, the safety is greatly improved, effectively preventing the pollution of the drilling fluid overflow to the ground environment.

Drawings

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

FIG. 1: is a schematic structural diagram of an oil pipe and a slurry replacing device in the prior art.

FIG. 2: is a schematic structural diagram of an oil pipe and a leakage testing device in the prior art.

FIG. 3: do the utility model discloses oil pipe is with replacing thick liquid, examining hourglass and flowing back integrated device's elevation sectional view.

FIG. 4: do the utility model discloses oil pipe is with replacing thick liquid, examining the front view cross-sectional view of sliding sleeve among leak and flowing back integrated device.

FIG. 5: do the utility model discloses oil pipe is with replacing thick liquid, examining the positive cross-sectional view of spacing pipe among leak and flowing back integrated device.

FIG. 6: is a front sectional view of a claw-separating structure in the sliding sleeve.

FIG. 7: is a top view of the jaw-separating structure in the sliding sleeve.

FIG. 8: do the utility model discloses the oil pipe is with replacing thick liquid, examining hourglass and flowing back integrated device is replacing the orthographic cross-sectional view of thick liquid state.

Reference numerals in the prior art: 901. a sleeve; 902. an oil pipe; 903. a screen pipe; 904. a filling tool; 905. finely punching the pipe; 906. a ball seat; 907. a nipple; 908. a steel ball; 909. and (4) a baffle ring.

The utility model provides a reference numeral: 1. an outer tube; 101. connecting screw threads; 2. a limiting pipe; 201. a second backstop slot; 3. a sliding sleeve; 301. a limiting boss; 302. a first backstop slot; 303. a claw separating structure; 3031. a containing groove; 4. finely punching the pipe; 5. a ball seat; 501. a through hole; 6. a sealing ball; 7. a second connecting member; 8. a first connecting member; 9. a first seal ring; 10. and a second seal ring.

Detailed Description

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

The utility model provides an oil pipe is with replacing thick liquid, testing hourglass and flowing back integrated device, this oil pipe is with replacing thick liquid, testing hourglass and flowing back integrated device setting in oil pipe's below to stretch into to the cover intraductal along with oil pipe.

As shown in fig. 3, the utility model discloses an oil pipe is with replacing thick liquid, examining hourglass and flowing back integrated device, include: the device comprises an outer tube 1, a limiting tube 2, a sliding sleeve 3, a ball seat 5 and a sealing ball 6, wherein the top of the outer tube 1 is connected with the bottom of an oil tube, the limiting tube 2 is fixedly arranged at the inner side of the outer tube 1, the sliding sleeve 3 is arranged at the inner side of the outer tube 1 and can slide upwards in a single direction, a plurality of first stopping clamping grooves 302 are continuously arranged on the outer wall of the upper part of the sliding sleeve 3 at intervals along the vertical direction, a plurality of second stopping clamping grooves 201 matched with the first stopping clamping grooves 302 are arranged on the inner wall of the limiting tube 2, the outer wall of the sliding sleeve 3 is matched and buckled with the inner wall of the limiting tube 2 through the first stopping clamping grooves 302 and the second stopping clamping grooves 201, the outer wall of the lower part of the sliding sleeve 3 is connected with the side wall of the outer tube 1 through a first connecting piece 8 which can be disconnected, the bottom of the sliding sleeve 3 is connected with a fine punching tube 4 matched with a filling, set up intercommunication oil pipe and thin towards the through-hole 501 of pipe 4 on the ball seat 5, ball seat 5 is connected with outer tube 1 and spacing pipe 2 through second connecting piece 7, in examining hourglass in-process with sealed ball 6 input outer tube 1, sealed ball 6 is located the top of through-hole 501, and form sealedly to through-hole 501, the diameter of sealed ball 6 is greater than the internal diameter of sliding sleeve 3, when 8 disconnection of first connecting piece, sliding sleeve 3 upwards slides and jack-up sealed ball 6, sealed ball 6 separates with ball seat 5, oil pipe passes through-hole 501 and thin towards pipe 4 intercommunication. When the utility model is used for replacing slurry, clear water is introduced into the oil pipe, and the clear water is discharged through the thin flushing pipe 4 so as to replace the slurry to the ground; when the leakage detection operation is carried out, the sealing ball 6 is put into the outer tube 1, the sealing ball 6 seals the through hole 501 on the ball seat 5, clear water is pumped into the outer tube 1, and the pressure in the outer tube 1 is increased and kept for a certain time to complete the leakage detection operation; when carrying out the operation of playing a tub, the disconnection of first connecting piece 8, sliding sleeve 3 upwards slides and jack-up ball sealer 6, ball sealer 6 and ball seat 5 separation, and the clear water in the oil pipe passes through-hole 501 and gets into thin towards pipe 4 to discharge outside through thin towards pipe 4, effectively prevented the excessive pollution to ground environment of drilling fluid. Additionally, the utility model discloses in only need once only to accomplish to test leak and replace thick liquid work, need not to go into the tubular column many times, saved construction procedure, reduced the working cost, replace thick liquid and test after leaking work, can play oil pipe's follow-up work through disconnection first connecting piece 8, not only avoided squeezing into the potential safety hazard that pressure caused through the pump truck, the tubular column that appears unable disconnection when having avoided adopting to suppress formula shearing pin plays the condition of difficulty, the security improves greatly.

Further, the utility model discloses be provided with on the top inner wall of outer tube 1 and be connected screw thread 101 with oil pipe matched with, be connected through the screw thread between the top inner wall of outer tube 1 and the oil pipe's outer wall, easy dismounting is convenient for at the exploitation site operation.

Further, the utility model discloses well first stopping draw-in groove 302 and second stopping draw-in groove 201 are the cockscomb structure draw-in groove that can mutually support the chucking.

Specifically, the sealing ball 6 may be, but is not limited to, a steel ball.

As shown in fig. 3 to 5, the outer tube 1, the limiting tube 2 and the sliding sleeve 3 are all cylindrical structures arranged along the vertical direction, the inner wall of the outer tube 1 is attached to the outer wall of the limiting tube 2, and the inner wall of the outer tube 1 is connected with the outer wall of the limiting tube 2 through threads. As shown in fig. 6 and 7, the upper portion of the sliding sleeve 3 is a claw-separating structure 303, a plurality of receiving grooves 3031 are uniformly formed in the claw-separating structure 303 along the circumferential direction, each receiving groove 3031 is a strip-shaped through groove arranged in the vertical direction, one end of the second connecting member 7 is connected to the side walls of the limiting pipe 2 and the outer pipe 1, and the other end of the second connecting member 7 penetrates through the receiving groove 3031 and is connected to the outer wall of the ball seat 5.

Specifically, the second connecting member 7 may be, but is not limited to, a fixing pin arranged in a horizontal direction.

As shown in fig. 3, the ball seat 5 is a cylindrical structure arranged along the vertical direction, the outer wall of the ball seat 5 is attached to the inner wall of the sliding sleeve 3, a plurality of first sealing rings 9 are arranged between the outer wall of the ball seat 5 and the inner wall of the sliding sleeve 3, and the plurality of first sealing rings 9 are clamped between the outer wall of the ball seat 5 and the inner wall of the sliding sleeve 3 from top to bottom. Guarantee through a plurality of first sealing washer 9 that be in encapsulated situation between ball seat 5 and the sliding sleeve 3 all the time to when examining the hourglass operation, the clear water of 6 tops of sealing ball can not flow in to 5 below of ball seats through the clearance between sliding sleeve 3 and the ball seat 5, ensures to examine the accuracy of hourglass work and goes on.

As shown in fig. 3, the lower outer wall of the sliding sleeve 3 is provided with a circular ring-shaped limiting boss 301 along the circumferential direction of the sliding sleeve 3, the top surface of the limiting boss 301 is an inclined plane matched with the bottom edge of the limiting pipe 2, and when the sliding sleeve 3 slides upwards to the highest position, the top surface of the limiting boss 301 is abutted against the bottom edge of the limiting pipe 2, so as to limit the sliding sleeve 3.

Further, the length of the accommodating groove 3031 in the vertical direction is greater than the maximum distance between the top surface of the limiting boss 301 and the bottom end edge of the limiting pipe 2.

Further, as shown in fig. 3, the utility model discloses well outer wall of spacing boss 301 and the inner wall of outer tube 1 laminate mutually, are provided with a plurality of second sealing washer 10 between the outer wall of spacing boss 301 and the inner wall of outer tube 1, guarantee through a plurality of second sealing washers 10 that to be in encapsulated situation all the time between outer tube 1 and the sliding sleeve 3, the clear water of ball sealer 6 top can not flow in through the clearance between outer tube 1 and the sliding sleeve 3 and go out the outside, ensures the utility model discloses be in normal operating condition all the time.

Further, the first connecting member 8 may be, but is not limited to, a shear pin, the shear strength of which is 5 to 6t (i.e., the pressure generated by 5 to 6 tons of force acting on the surface of the shear pin), one end of the shear pin is connected to the sidewall of the outer tube 1, and the other end of the shear pin is connected to the outer wall of the limit boss 301. Can guarantee to cut off the shear pin smoothly after accomplishing the work of examining the hourglass through the setting of shear pin, carry out and replace thick liquid work.

The working process of the integrated device for replacing slurry, detecting leakage and draining the liquid for the oil pipe is as follows:

first, the slurry replacement work is performed. And measuring the length of the oil pipe, so that the fine flushing pipe 4 can be put into a filling tool at the bottom of the well, slowly putting the oil pipe into the well, stopping putting the oil pipe when the weight indicator is suspended for 3 to 4t, and enabling the fine flushing pipe 4 to enter the filling tool at the moment. Clean water is pumped into the oil pipe through the pump truck, the clean water enters a cavity between the oil pipe and the sieve pipe through the fine flushing pipe 4, slurry in the cavity returns to the ground, and the slurry replacing work is finished until the slurry returning to the ground is changed into the clean water.

Then, a leak test was performed. The sealing ball 6 is thrown into the outer pipe 1, the sealing ball 6 seals the through hole 501 on the ball seat 5, clear water is pumped into the oil pipe through the pump truck, the clear water is stored above the sealing ball 6, the pressure in the oil pipe is increased due to the fact that the clear water is continuously pumped, the pressure gauge for observing the pump truck rises to 15Mpa, the pump is stopped for 5-10 min, the pressure displayed on the pressure gauge is unchanged, the oil pipe is qualified in leakage detection, and the leakage detection work is finished.

And finally, the oil pipe is lifted out. Continue below oil pipe, to the filling tool full contact in thin towards pipe 4 and shaft bottom to apply load 7 to 8t to oil pipe, cut off until the shear pin, and oil pipe can't transfer, as shown in fig. 8, the utility model provides a 3 rebound of sliding sleeve offset to the bottom with spacing pipe 2, and ball sealer 6 is by 3 jack-ups of sliding sleeve, and the oil pipe of ball sealer 6 top passes through-hole 501 on the ball seat 5 and the thin towards pipe 4 intercommunication of ball sealer 6 below, and the clear water of ball sealer 6 top is through thin towards pipe 4 discharge back, can play to above ground oil pipe to liquid in the oil pipe can't be discharged and is played to ground along with oil pipe has been avoided.

The utility model discloses oil pipe is with replacing thick liquid, examining hourglass and flowing back integrated device's characteristics and advantage are:

the integrated device for replacing slurry, detecting leakage and draining for the oil pipe is connected with the oil pipe through an outer pipe 1, a limiting pipe 2 is fixedly arranged in the outer pipe 1, a sliding sleeve 3 is matched and connected with the limiting pipe 2 through a stopping clamping groove, so that the sliding sleeve 3 can slide upwards in the outer pipe 1 in a one-way mode, the sliding sleeve 3 is connected with the outer pipe 1 through a first connecting piece 8, the bottom of the sliding sleeve 3 is connected with a thin flushing pipe 4, a ball seat 5 is fixed in the outer pipe 1, a through hole 501 for communicating the oil pipe with the thin flushing pipe 4 is formed in the ball seat 5, the ball seat 5 is located on the inner side of the sliding sleeve 3, when slurry replacing operation is carried out, clean water is introduced into the oil pipe, and the clean water is discharged through the thin flushing pipe 4 to; when the leakage detection operation is carried out, the sealing ball 6 is put into the outer tube 1, the sealing ball 6 seals the through hole 501 on the ball seat 5, clear water is pumped into the outer tube 1, and the pressure in the outer tube 1 is increased and kept for a certain time to complete the leakage detection operation; when the pipe lifting operation is carried out, the first connecting piece 8 is cut off, because the diameter of the sealing ball 6 is larger than the inner diameter of the sliding sleeve 3, the sliding sleeve 3 slides upwards and jacks up the sealing ball 6, the sealing ball 6 is separated from the ball seat 5, clean water in the oil pipe enters the fine flushing pipe 4 through the through hole 501 and is discharged outwards through the fine flushing pipe 4, the pollution of liquid in the oil pipe to the ground is prevented, the leakage detection and slurry replacement work is completed at one time, the pipe column does not need to be put down for many times, the construction procedure is saved, the operation cost is reduced, after the slurry replacement and leakage detection work is completed, the subsequent work of lifting the oil pipe can be carried out by cutting off the first connecting piece 8, the potential safety hazard caused by the pressure driven by a pump truck is avoided, the situation that the pipe column cannot be disconnected to bring about the difficulty in lifting when the pressing type shearing pin is adopted is avoided, the liquid in the oil pipe is discharged before the oil pipe is lifted out, effectively preventing the pollution of the drilling fluid overflow to the ground environment.

Two, this oil pipe is with replacing thick liquid, the upper portion of sliding sleeve 3 among the integrative device of leakage test and flowing back is branch claw structure 303, divide claw structure 303 to go up and seted up a plurality of storage tanks 3031, the one end of second connecting piece 7 is connected with the lateral wall of spacing pipe 2 and outer tube 1 respectively, the other end of second connecting piece 7 passes storage tank 3031 and with the outer wall connection of ball seat 5, through the setting of branch claw structure 303, guarantee that second connecting piece 7 can fix ball seat 5 on outer tube 1 and spacing pipe 2, and do not receive sliding sleeve 3's influence.

Third, this oil pipe is with replacing thick liquid, testing leak and flowing back integrated device between the outer wall of ball seat 5 and the inner wall of sliding sleeve 3 be provided with a plurality of first sealing washer 9, guarantee through a plurality of first sealing washers 9 that be in encapsulated situation all the time between ball seat 5 and the sliding sleeve 3 to when testing leak the operation, the clear water of sealing ball 6 top can not flow in to ball seat 5 below through the clearance between sliding sleeve 3 and the ball seat 5, ensures to test the accuracy of leaking work and goes on.

Fourth, this oil pipe is with replacing thick liquid, testing between leak and flowing back integrated device spacing boss 301's the outer wall and the inner wall of outer tube 1 be provided with a plurality of second sealing washer 10, guarantee through a plurality of second sealing washers 10 that be in encapsulated situation all the time between outer tube 1 and the sliding sleeve 3, the clear water of ball sealer 6 top can not flow in through the clearance between outer tube 1 and the sliding sleeve 3 and go out the outside, ensures the utility model discloses be in normal operating condition all the time.

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

Claims (10)

1. The utility model provides an oil pipe is with replacing thick liquid, examining hourglass and flowing back integrated device, sets up in the below of oil pipe to along with oil pipe stretches into to the cover intraductal, its characterized in that, this oil pipe includes with replacing thick liquid, examining hourglass and flowing back integrated device:

the top of the outer pipe (1) is connected with the bottom of the oil pipe;

the limiting pipe (2) is fixedly arranged in the outer pipe (1);

the sliding sleeve (3) is arranged in the outer pipe (1) in an upward unidirectional sliding manner, the outer wall of the upper part of the sliding sleeve (3) is matched and connected with the inner wall of the limiting pipe (2) through a backstop clamping groove, the outer wall of the lower part of the sliding sleeve (3) is connected with the side wall of the outer pipe (1) through a first connecting piece (8) which can be disconnected, and the bottom of the sliding sleeve (3) is connected with a fine punching pipe (4) matched with a filling tool which is preset in the sleeve;

the ball seat (5) is provided with a through hole (501) for communicating the oil pipe with the fine flushing pipe (4), the ball seat (5) is positioned on the inner side of the sliding sleeve (3), the top surface of the ball seat (5) is not lower than that of the sliding sleeve (3), and the sliding sleeve (3) is connected with the outer pipe (1) and the limiting pipe (2) through a second connecting piece (7); and

sealing ball (6), it is in the in-process of checking leaks place the top of through-hole (501), and right through-hole (501) are sealed, the diameter of sealing ball (6) is greater than the internal diameter of sliding sleeve (3), when first connecting piece (8) disconnection, sliding sleeve (3) upwards slides and jack-up sealing ball (6), sealing ball (6) with ball seat (5) separation, oil pipe passes through-hole (501) with thin towards pipe (4) intercommunication.

2. The integrated slurry replacing, leakage testing and liquid discharging device for the oil pipe as claimed in claim 1, wherein the outer pipe (1) and the limiting pipe (2) are both of a cylindrical structure, the inner wall of the outer pipe (1) is attached to the outer wall of the limiting pipe (2), and the outer pipe (1) is connected with the limiting pipe (2) through threads.

3. The integrated slurry replacing, leakage testing and liquid discharging device for the oil pipe as claimed in claim 1, wherein the upper portion of the sliding sleeve (3) is a claw-separating structure (303), a plurality of accommodating grooves (3031) are circumferentially formed in the claw-separating structure (303), the accommodating grooves (3031) are long-strip-shaped through grooves vertically arranged, one end of the second connecting member (7) is respectively connected with the limiting pipe (2) and the side wall of the outer pipe (1), and the other end of the second connecting member (7) passes through the accommodating grooves (3031) and is connected with the outer wall of the ball seat (5).

4. The integrated slurry replacement, leakage inspection and liquid drainage device for the oil pipe as claimed in claim 1 or 3, wherein the second connecting piece (7) is a fixing pin.

5. The integrated slurry replacing, leakage testing and liquid draining device for the oil pipe as claimed in claim 1, wherein the ball seat (5) is of a cylindrical structure, the outer wall of the ball seat (5) is attached to the inner wall of the sliding sleeve (3), and a plurality of first sealing rings (9) are arranged between the outer wall of the ball seat (5) and the inner wall of the sliding sleeve (3).

6. The integrated slurry replacing, leakage testing and liquid discharging device for the oil pipe as claimed in claim 1, wherein a limiting boss (301) is arranged on the outer wall of the lower portion of the sliding sleeve (3), the sliding sleeve (3) slides upwards to the highest position, and the top surface of the limiting boss (301) abuts against the edge of the bottom end of the limiting pipe (2).

7. The integrated slurry replacing, leakage testing and liquid discharging device for the oil pipe as claimed in claim 6, wherein the outer wall of the limiting boss (301) is attached to the inner wall of the outer pipe (1), and a plurality of second sealing rings (10) are arranged between the outer wall of the limiting boss (301) and the inner wall of the outer pipe (1).

8. The integrated slurry replacing, leakage testing and liquid draining device for the oil pipe as claimed in claim 6, wherein the top surface of the limiting boss (301) is an inclined surface matched with the bottom end edge of the limiting pipe (2).

9. The integrated slurry replacing, leakage testing and liquid discharging device for the oil pipe as claimed in claim 6, wherein the first connecting piece (8) is a shear pin, one end of the shear pin is connected with the side wall of the outer pipe (1), and the other end of the shear pin is connected with the outer wall of the limiting boss (301).

10. The integrated slurry replacing, leakage testing and liquid draining device for the oil pipe as claimed in claim 1, wherein the top of the outer pipe (1) is provided with a connecting screw thread (101) matched with the oil pipe, and the outer pipe (1) is connected with the oil pipe through the screw thread.

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