CN113374426A

CN113374426A - Reversible hydraulic propeller

Info

Publication number: CN113374426A
Application number: CN202110665347.8A
Authority: CN
Inventors: 石擎天; 彭文玥; 彭小爽; 黄杰; 刘德举; 孙洪振
Original assignee: Chengdu Asberi Technology Co ltd
Current assignee: Chengdu Asberi Technology Co ltd
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2021-09-10

Abstract

The invention discloses a novel reversible hydraulic propeller, wherein a steel ball is arranged in an upper joint, a limit screw is arranged on the upper joint, a piston is arranged in a middle short section, the lower joint is connected with the piston into a whole through threaded connection, the upper joint is connected with the middle short section through threaded connection, when a pipe column is normally put in, the steel ball is seated and sealed on a ball seat of the upper joint through hydraulic pressure to form sealing, fluid can only be sprayed out through a bypass water hole and forms reverse thrust on the pipe column, the bending of the pipe column caused by overlarge friction resistance in a horizontal section is prevented, when the pipe column contacts a front obstacle, a main flow passage is opened by pushing the steel ball, a part of the fluid enters a lower pipe column, a lower tool is started to remove the obstacle, a part of the fluid is still sprayed out from the bypass water hole to improve the back-flowing efficiency and prevent the drill from being stuck, the middle short section and the piston are matched with a key tooth to transmit the torque of the pipe column, and a sealing ring is arranged at each key position, preventing well fluids from entering the tool interior.

Description

Reversible hydraulic propeller

Technical Field

The invention belongs to the technical field of underground tools of oil and gas drilling engineering, and relates to a novel reversible hydraulic propeller.

Background

Due to the characteristics of high flexibility and rigidity, high automation degree, capability of working under pressure and the like, the coiled tubing operation technology is rapidly developed in recent years and is gradually applied to the drilling and completion engineering of highly-deviated wells and horizontal wells. Because the frictional resistance between the coiled tubing and the casing in the highly deviated well and the horizontal well is increased, after the frictional resistance is balanced with the gravity of the coiled tubing, the tubular column needs to be forcibly pressed into the well, the frictional resistance is continuously increased along with the continuous lengthening of the horizontal section, the pressure of the coiled tubing pressed into the well is gradually increased, the phenomenon of self-locking of the coiled tubing in the horizontal section due to the large frictional resistance in the actual operation process can be caused, and the application of the coiled tubing in the highly deviated well and the long horizontal well is severely restricted.

Disclosure of Invention

The invention aims to provide a novel reversible hydraulic propeller, which solves the problem that in the prior art, a coiled tubing is self-locked due to large friction resistance in a highly-deviated well and a long horizontal section well, further improves the extension capacity of the coiled tubing in a sleeve, and avoids the problems that the capacity of returning debris, gravel and other impurities is low, and the drilling accident is easily caused.

The technical scheme adopted by the invention is as follows:

the utility model provides a novel hydraulic propeller that can commutate, 1 inside steel ball 6 of placing of top connection, on packing into top connection 1 with stop screw 2, inside nipple joint 3 in the middle of piston 4 is put into, lower clutch 5 is as an organic whole even with piston 4 through threaded connection, top connection 1 is connected to together through threaded connection and middle nipple joint 3. When normally going into the tubular column, the steel ball 6 receives hydraulic pressure force to set up on the ball seat of top connection 1, forms sealed, and fluid can only spout through the bypass water hole, and high-pressure liquid returns the well head from runner II through runner I this moment. The high-pressure fluid rapidly rushes out from the flow passage II to play two roles: 1) the pipe column is pushed reversely, so that a pulling force is always acted on the front end of the pipe column in the pipe column running process, the self-locking phenomenon caused by overlarge friction resistance in the horizontal section is prevented, and the extension capacity of the coiled tubing in the casing is further improved; 2) the high-speed fluid flow field and the surrounding flow field form relative negative pressure, and the chip at the front end of the tool can be adsorbed to the rear of the tool by the siphon effect and flows to the well head along with the high-speed fluid. And the upper joint 1 is provided with a limit screw 2 which has the function of preventing the steel ball 6 from being connected to the upper tool due to the pressure fluctuation at the bottom of the well and influencing the normal work of the upper tool.

When the shoes contact a forward obstruction such as a bridge plug or a blasthole left after casing perforation, the reaction forces push back the shoes connected to the hydraulic thruster. The mill shoe is connected with the hydraulic propeller through the lower joint 5, the lower joint 5 is pushed back along with the mill shoe, and the lower joint 5 is in contact with the middle short section 3 firstly because the distance C between the lower joint 5 and the middle short section 3 is smaller than the distance A between the piston 4 and the upper joint 1 and the distance B between the piston 4 and the upper joint 1, so that the jacking force on the pipe column is still transmitted to the upper pipe column through the middle short section 3 and the upper joint 1. An upper top boss 4-1 on the upper part of the piston 4 pushes the steel ball 6 to leave a ball seat of the upper joint 1, and because the outer diameter of the steel ball 6 is smaller than the inner diameter of the upper joint 1, a flow channel III is opened for high-pressure liquid, two fluid channels are formed, a small part of fluid returns out of a well head through the flow channel I and the flow channel II, and most of the rest fluid enters a mill shoe through the flow channel I, the flow channel III and the flow channel IV to sweep out well bottom obstacles. Simultaneously, the liquid that returns from the bypass flow path when impurity such as detritus, grit that return from the tubular column annular space passes through hydraulic propulsor's bypass hole returns out can impel impurity such as detritus, grit to return the well head to prevent impurity such as detritus, grit from piling up and causing the sticking of drill.

The middle short section 3 is provided with a sealing surface 3-1 which forms a seal with the upper joint 1, so that liquid in a well can be effectively prevented from entering the tool, and the middle short section 3 is connected with the upper joint 1 into a whole through a connecting thread 3-2. The middle short section 3 is internally provided with a key slot 3-4, and the key slot 3-4 is matched with key teeth 4-3 on the piston 4 to transmit torque, so that the lower tubular column can only move axially. The middle short section 3 is provided with sealing ring grooves 3-6, and liquid in a well can be effectively prevented from entering the tool after the sealing ring 4 is installed in the middle short section. An upper oil filling port 3-3 and a lower oil filling port 3-5 are arranged on the middle short section 3, hydraulic oil can be injected through one side after the tool is assembled, and the piston 4 is ensured to be in a good lubricating state in each key tooth in the middle short section 3 by a method of emptying the one side.

An upper top boss 4-1 contacted with the steel ball 6 is arranged on the piston 4, a boss notch 4-7 is arranged on the upper top boss 4-1, and when the lower joint 5 pushes the piston 4 and the steel ball 6 to move towards the wellhead direction, high-pressure liquid enters the lower pipe column through the boss notch 4-7. And sealing ring grooves are respectively arranged at two ends of the piston, so that other liquids are effectively prevented from entering a hydraulic oil cavity of the middle short section 3, and the service life of the tool is prolonged. The piston 4 is provided with key teeth 4-3 which are matched with the key grooves 3-4 on the middle short section 3 to play a role in transmitting torque and ensuring that the lower pipe column can only axially move. More beneficially, a key tooth vacancy 4-6 is always formed in the piston 4, so that when the piston 4 switches the flow channel back and forth, hydraulic oil at two ends can rapidly circulate, and free switching of the piston 4 is guaranteed.

The function of automatically switching the flow channel direction has the following advantages:

when no obstacle exists in front of the pipe column, fluid can be ejected out of the bypass water hole at a high speed only, relative negative pressure is formed between the fluid and a surrounding flow field, and rock debris and gravel in front of the tool can be adsorbed to the rear of the tool under the action of a siphon effect and flow to a well head along with the high-speed fluid.

And secondly, after the shaft is kept clean, the frictional resistance between the pipe columns can be greatly reduced, the probability of drill sticking is reduced, and the efficiency of running the pipe column is improved.

When the front of the pipe column meets an obstacle, fluid can be sprayed out through the bypass water hole and the straight-through water hole simultaneously, the shoe grinding work at the lower part of the pipe column is started, the obstacle at the bottom of the well is swept, and generated impurities such as rock debris and gravel can timely return and cannot continue to be accumulated.

And fourthly, when no barrier exists in front of the pipe column, the fluid can be ejected out of the bypass water hole at a high speed, a forward hydraulic thrust can be provided, the running-in depth of the continuous oil pipe and the tool pipe string can be assisted, and the extension capability of the continuous oil pipe is improved.

Drawings

FIG. 1 is a schematic view of a reversible hydraulic thruster when bypassing.

In the figure, 1 is an upper joint, 2 is a limiting screw, 3 is a middle short section, 4 is a piston, 5 is a lower joint, 6 is a steel ball, 7 is a sealing ring 1, 8 is a sealing ring 2, 9 is a screw, 10 is a sealing ring 3, 11 is a sealing ring 4, I is a main flow passage 1, II is a bypass flow passage, A is a distance 1 between the piston and the upper joint, B is a distance 2 between the piston and the upper joint, and C is a distance between the lower joint and the middle short section.

Fig. 2 is a schematic structural diagram of the reversible hydraulic propeller when the reversible hydraulic propeller is used for simultaneously realizing direct connection and bypass.

In the figure, 1 is an upper joint, 2 is a limiting screw, 3 is a middle short section, 4 is a piston, 5 is a lower joint, 6 is a steel ball, 7 is a sealing ring 1, 8 is a sealing ring 2, 9 is a screw, 10 is a sealing ring 3, 11 is a sealing ring 4, I is a main runner 1, II is a bypass runner, III is a main runner 2, IV is a main runner 3.

FIG. 3 is a schematic diagram of a middle short section structure.

In the figure, 3 is a middle short section, 3-1 is a sealing surface, 3-2 is a connecting thread, 3-3 is an upper oil filling port, 3-4 is a key groove, 3-5 is a lower oil filling port, and 3-6 is a sealing ring groove.

Fig. 4 is a schematic view of the piston structure.

In the figure, 4 parts of a piston, 4-1 parts of an upper top boss, 4-2 parts of a sealing ring groove, 4-3 parts of key teeth, 4-4 parts of a sealing ring groove, 4-5 parts of connecting threads, 4-6 parts of key tooth vacant positions and 4-7 parts of boss gaps.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, after a steel ball 6 is placed in an upper joint 1, a limit screw 2 is installed in the upper joint 1, the upper joint 1 is connected with a middle short section 3 through threaded connection, a piston 4 is placed between the upper joint 1 and the middle short section 3, a lower joint 5 is connected with the piston 4 through threaded connection, and the middle short section 3 is matched with key teeth 4-3 on the piston 4 through key grooves 3-4 to play a role in transmitting torque.

At the moment, the steel ball 6 is seated on the ball seat of the upper joint 1 by hydraulic pressure to form sealing, fluid can be sprayed out only through the bypass water hole, and at the moment, high-pressure liquid returns to a wellhead from the flow channel II through the flow channel I. The high-pressure fluid rapidly rushes out from the flow passage II to play two roles: 1) the pipe column is pushed reversely, so that a pulling force is always acted on the front end of the pipe column in the pipe column running process, the self-locking phenomenon caused by overlarge friction resistance in the horizontal section is prevented, and the extension capacity of the coiled tubing in the casing is further improved; 2) the high-speed fluid flow field and the surrounding flow field form relative negative pressure, and the chip at the front end of the tool can be adsorbed to the rear of the tool by the siphon effect and flows to the well head along with the high-speed fluid.

The upper joint 1 is provided with a limit screw 2 which is used for preventing the steel ball 6 from flowing upwards to the upper tool due to the pressure fluctuation at the bottom of the well and influencing the normal work of the upper tool. Referring to fig. 2, when the grind shoe contacts a forward obstruction such as a bridge plug or a blasthole left after casing perforation, the reaction force pushes the grind shoe back in conjunction with the hydraulic thruster. The mill shoe is connected with the hydraulic propeller through the lower joint 5, the lower joint 5 is pushed back along with the mill shoe, and the lower joint 5 is in contact with the middle short section 3 firstly because the distance C between the lower joint 5 and the middle short section 3 is smaller than the distance A between the piston 4 and the upper joint 1 and the distance B between the piston 4 and the upper joint 1, so that the jacking force on the pipe column is still transmitted to the upper pipe column through the middle short section 3 and the upper joint 1. An upper top boss 4-1 on the upper part of the piston 4 pushes the steel ball 6 to leave a ball seat of the upper joint 1, and because the outer diameter of the steel ball 6 is smaller than the inner diameter of the upper joint 1, a flow channel III is opened for high-pressure liquid, two fluid channels are formed, a small part of fluid returns to a wellhead through the flow channel I and the flow channel II, and the rest most of fluid enters the mill shoe through the flow channel I, the flow channel III and the flow channel IV to sweep out well bottom obstacles. Simultaneously, the liquid that returns from the bypass flow path when impurity such as detritus, grit that return from the tubular column annular space passes through hydraulic propulsor's bypass hole returns out can impel impurity such as detritus, grit to return the well head to prevent impurity such as detritus, grit from piling up and causing the sticking of drill.

Through the transposition, when the steel ball 6 is sealed with the ball seat of the upper joint 1, high-pressure fluid can only be sprayed out from a bypass water hole, when a grinding shoe contacts with an obstacle, the reaction force of the grinding shoe pushes the lower joint 5 to move towards the wellhead direction, so that the piston 4 pushes the steel ball 6 to leave the ball seat of the upper joint 1, the high-pressure fluid is provided with two flow channels, a small part of the fluid is sprayed out through the flow channel II, and the rest most of the fluid enters the lower part of the tubular column through the flow channel I, the flow channel III and the flow channel IV, so that the grinding shoe at the lower part of the tubular column is driven to work, and the obstacle at the bottom of the well is cleaned. Referring to fig. 3, a sealing surface 3-1 which forms a seal with the upper joint 1 is arranged on the middle short section 3, so that liquid in a well can be effectively prevented from entering the tool, the middle short section 3 is connected with the upper joint 1 into a whole through a connecting thread 3-2, a key groove 3-4 is arranged in the middle short section 3, torque is transmitted through the cooperation of the key groove 3-4 and a key tooth 4-3 on a piston 4, the effect that a lower pipe column can only move axially is ensured, a sealing ring groove 3-6 is arranged on the middle short section 3, and the liquid in the well can be effectively prevented from entering the tool after the sealing ring 4 is installed in the middle short section.

An upper oil filling port 3-3 and a lower oil filling port 3-5 are arranged on the middle short section 3, hydraulic oil can be injected through one side after the tool is assembled, and the piston 4 is ensured to be in a good lubricating state in each key tooth in the middle short section 3 by a method of emptying the one side.

Referring to fig. 4, an upper jacking boss 4-1 in contact with a steel ball 6 is arranged on a piston 4, a boss notch 4-7 is formed in the upper jacking boss 4-1, when a lower joint 5 pushes the piston 4 and the steel ball 6 to move towards a wellhead, high-pressure liquid enters a lower pipe column through the boss notch 4-7, sealing ring grooves are respectively formed in two ends of the piston, other liquid is effectively prevented from entering a hydraulic oil chamber of a middle nipple 3, and the service life of a tool is prolonged.

The key teeth 4-3 arranged on the piston 4 are matched with the key grooves 3-4 on the middle short section 3 to transmit torque, so that the effect that the lower pipe column can only move axially is ensured, and more beneficially, a key tooth vacancy 4-6 is always reserved on the piston 4, so that hydraulic oil at two ends can quickly circulate when the piston 4 is switched back and forth, and the free switching of the piston 4 is ensured.

The working principle of the invention is that,

the steel ball 6 is placed in the upper joint 1, the limit screw 2 is installed on the upper joint 1, the piston 4 is placed in the middle short section 3, the lower joint 5 is connected with the piston 4 into a whole through threaded connection, and the upper joint 1 is connected with the middle short section 3 through threaded connection. When normally going into the tubular column, the steel ball 6 receives hydraulic pressure force to set up on the ball seat of top connection 1, forms sealed, and fluid can only spout through the bypass water hole, and high-pressure liquid returns the well head from runner II through runner I this moment. The high-pressure fluid rapidly rushes out from the flow passage II to play two roles: 1) the pipe column is pushed reversely, so that a pulling force is always acted on the front end of the pipe column in the pipe column running process, the self-locking phenomenon caused by overlarge friction resistance in the horizontal section is prevented, and the extension capacity of the coiled tubing in the casing is further improved; 2) the high-speed fluid flow field and the surrounding flow field form relative negative pressure, and the chip at the front end of the tool can be adsorbed to the rear of the tool by the siphon effect and flows to the well head along with the high-speed fluid. And the upper joint 1 is provided with a limit screw 2 which has the function of preventing the steel ball 6 from being connected to the upper tool due to the pressure fluctuation at the bottom of the well and influencing the normal work of the upper tool.

An upper top boss 4-1 contacted with the steel ball 6 is arranged on the piston 4, a boss notch 4-7 is formed in the upper top boss 4-1, and when the lower joint 5 pushes the piston 4 and the steel ball 6 to move towards the wellhead direction, high-pressure liquid enters the lower pipe column through the boss notch 4-7. And sealing ring grooves are respectively arranged at two ends of the piston, so that other liquids are effectively prevented from entering a hydraulic oil cavity of the middle short section 3, and the service life of the tool is prolonged. The piston 4 is provided with key teeth 4-3 which are matched with the key grooves 3-4 on the middle short section 3 to play a role in transmitting torque and ensuring that the lower pipe column can only axially move. More beneficially, a key tooth vacancy 4-6 is always formed in the piston 4, so that when the piston 4 switches the flow channel back and forth, hydraulic oil at two ends can rapidly circulate, and free switching of the piston 4 is guaranteed.

The piston 4 is provided with key teeth 4-3 which are matched with key grooves 3-4 on the middle short section 3, so that torque is transmitted, and the effect that the lower pipe column can only move axially is ensured.

The upper joint 1 is internally provided with a ball seat so that the steel ball 6 can be seated on the ball seat to form a seal when being subjected to the pressure of fluid.

The upper joint 1 is provided with a limiting screw 2 for limiting the steel ball 6, so that the steel ball 6 is effectively prevented from being connected to an upper tool due to bottom-hole pressure fluctuation to influence the normal work of the upper tool.

And the upper joint 1 is provided with a bypass flow passage II, and when the steel ball 4 is set on the ball seat 1-2 to form sealing, fluid can be ejected from the bypass water hole 2 only.

When the mill shoe connected with the reversible hydraulic propeller contacts a barrier in front, the reaction force pushes the lower joint 5, the piston 4 and the steel ball 6 back together, the distance C between the lower joint and the middle short section is beneficially smaller than the distance 2 between the piston and the upper joint and the distance 1 between the piston and the upper joint, the jacking force on the pipe column is still transmitted to the upper pipe column through the middle short section 3 and the upper joint 1, and the internal stress of the tool is improved.

When the grinding shoe connected with the reversible hydraulic propeller contacts a front obstacle, the lower joint 5, the piston 4 and the steel ball 6 are pushed back together by the reaction force, so that the flow channel III is opened, high-pressure liquid has two channels, one part of the high-pressure liquid enters the lower part of the pipe column through the main flow channel, tools such as a hydraulic motor, the grinding shoe and the like are started to work, and the underground obstacle is cleaned.

When the junk mill that is connected with reversible hydraulic propeller contacts the barrier in the place ahead, still have a small fluid to flow through II discharges of runner, when impurity such as the detritus of tubular column front end, gravel return the well head with higher speed when passing through hydraulic propeller's bypass hole, prevent that impurity such as detritus, gravel from piling up and causing the sticking of drill.

The middle short section 3 is provided with an upper oil filling port 3-3 and a lower oil filling port 3-5, and the hydraulic oil chamber can be ensured to be completely filled by a method of injecting hydraulic oil from one side and emptying the hydraulic oil from the other side.

A key tooth vacancy 4-6 is always formed in the piston 4, so that hydraulic oil pressure at two ends can be balanced when the piston 4 is switched back and forth, and flow channel switching can be easily carried out.

Each key part of the hydraulic propeller is provided with a sealing ring, and the function of the hydraulic propeller is to prevent liquid in a well from entering the inside of the tool.

Claims

1. A novel reversible hydraulic propeller is characterized in that: after a steel ball (6) is placed in the upper joint (1), the limiting screw (2) is installed on the upper joint (1), the piston (4) is placed between the upper joint (1) and the middle short section (3), the upper joint (1) is connected with the middle short section (3) through threaded connection, the piston (4) is connected with the lower joint (5) through threaded connection, and key teeth (4-3) arranged on the piston (4) are matched with key grooves (3-4) on the middle short section (3) to transmit torque and ensure that a lower pipe column can only move axially.

2. The novel reversible hydraulic thruster of claim 1, further comprising: a ball seat is arranged in the upper joint (1) so that the steel ball (6) can be seated on the ball seat to form sealing when being subjected to the pressure of fluid.

3. The novel reversible hydraulic thruster of claim 1, further comprising: the upper joint (1) is provided with a bypass flow passage (II), and when the steel ball (6) is seated on the ball seat on the upper joint (1), fluid can only be sprayed out from the bypass flow passage (II).

4. The novel reversible hydraulic thruster of claim 1, further comprising: the upper joint (1) is provided with the limiting screw (2) for limiting the steel ball (6), so that the steel ball (6) is effectively prevented from being connected to the upper tool due to the fluctuation of bottom pressure, and the normal work of the upper tool is prevented from being influenced.

5. The novel reversible hydraulic thruster of claim 1, further comprising: when the mill shoe connected with the reversible hydraulic propeller contacts a barrier in front, the reaction force pushes the lower joint (5), the piston (4) and the steel ball (6) back together, and the distance (C) between the lower joint (5) and the middle short section (3) is smaller than the distance (2) between the piston (4) and the upper joint (1) and the distance (1) between the piston (4) and the upper joint (1), so that the jacking force on the pipe column is still transmitted to the upper pipe column through the middle short section (3) and the upper joint (1), and the internal stress of the tool is improved.

6. The novel reversible hydraulic thruster of claim 1, further comprising: when the grinding shoe connected with the reversible hydraulic propeller contacts a front obstacle, the reaction force pushes the lower joint (5), the piston (4) and the steel ball (6) back together, so that the main flow passage 2 (III) is opened, high-pressure liquid has two passages, one part of the high-pressure liquid enters the lower part of the pipe column through the main flow passage, tools such as a hydraulic motor, the grinding shoe and the like are started to work, and the obstacle at the bottom of the well is cleaned.

7. The novel reversible hydraulic thruster of claim 1, further comprising: when the junk mill that is connected with reversible hydraulic propeller contacts the barrier in the place ahead, still have some fluid to discharge through bypass flow path (II), when impurity such as the detritus of tubular column front end, gravel returns the well head with higher speed when passing through hydraulic propeller's bypass hole, prevents that impurity such as detritus, gravel from piling up and causing the sticking of drill.

8. The novel reversible hydraulic thruster of claim 1, further comprising: the middle short joint (3) is provided with an upper oil filling port (3-3) and a lower oil filling port (3-5), and the hydraulic oil chamber can be completely filled by a method of filling hydraulic oil from one side and emptying the hydraulic oil from the other side.

9. The novel reversible hydraulic thruster of claim 1, further comprising: a key tooth vacancy (4-6) is always formed in the piston (4), so that hydraulic oil at two ends can quickly circulate when the piston (4) is switched back and forth, and the free switching of the piston (4) is ensured.

10. The novel reversible hydraulic thruster of claim 1, further comprising: each key part of the hydraulic thruster is provided with a sealing ring which is used for preventing liquid in the well from entering the inside of the tool.