CN204457499U - Tubing tripping device in snubbing workover rig - Google Patents

Abstract

The utility model discloses an oil pipe tripping device in a snubbing workover rig, which is a well hydraulic cylinder system and comprises a first cylinder barrel and a second cylinder barrel sleeved with the first cylinder barrel; the first fixing mechanism comprises a first body fixed with the outer cylinder barrel, and the first body is provided with a first channel communicated with a working cavity of the first cylinder barrel; the second fixing mechanism comprises a second body fixed with the inner cylinder barrel; the balance cylinder comprises a balance cylinder barrel and a piston rod fixedly arranged on the first body, the piston rod is fixedly arranged in the balance cylinder barrel in a penetrating mode, a balance cylinder piston is connected to the piston rod, the balance cylinder piston, the piston rod and the balance cylinder barrel form a working cavity of the balance cylinder, a second channel is arranged inside the piston rod, and the second channel is communicated with the first channel and the working cavity of the balance cylinder. The utility model discloses power cylinder's load when can effectively alleviate workover, reduces complete machine installation power to can avoid the pollution of well liquid to ground.

Description

Tubing tripping device in snubbing workover rig

technical field

The utility model relates to the technical field of oilfield operations, in particular to an oil pipe tripping device in a snubbing workover rig.

Background technique

The snubbing workover rig is mainly developed for the overhaul operation of water injection wells in oilfields. Oil wells are depressurized or treated with well killing hydraulic wells to prevent blowout accidents during well workover. The snubbing workover rig can realize workover or tripping string operations under the condition of liquid pressure in the well, without blowout accidents. Usually the snubbing workover rig consists of hydraulic power unit, derrick, driving power cylinder, pulley and wire rope system, operating platform, traction winch, balance winch, swimming body (including swimming slips, turntable, swimming sealing device) Composition), fixed body (including wellhead sealer group, fixed sealing slips), there is a well fluid cylinder between the fixed body and the floating body, the well fluid cylinder is a two-stage retractable hollow plunger cylinder, the two-stage cylinder There is a seal between them. The lower part of the outer cylinder of the well fluid cylinder is in sealing connection with the fixed body, and the upper part of the inner cylinder of the well fluid cylinder is in sealing connection with the floating body. The state of the snubbing workover rig before lifting the pipe string in the snubbing operation is that the upstream half-sealing sealer is closed, the floating slips are closed and the oil pipe is clamped tightly, and the half-sealing sealer on the fixed body is connected with the fixed sealer. Sealed slips open. The hydraulic pressure drives the steel rope of the power cylinder, the steel rope lifts the swimming body through the pulley, and the oil pipe moves upwards driven by the swimming slips. There is no relative movement between the seal of the floating semi-sealing sealer and the tubing, and it is in a static sealing state. The half-sealer and fixed slips on the fixed body are opened, and there is no contact between the outer surface of the tubing and the seal of the half-sealer. When the swimming body moves downward, the floating half-sealing sealer and the floating slips are in an open state, the half-sealing sealer and slips on the fixed body are in a closed state, and the floating half-sealing sealer and the fixed There is no dynamic friction between the seal of the semi-sealed well sealer on the body and the outer surface of the tubing. In this way, the semi-sealing sealer and slips on the floating body and the half-sealing sealer and slips on the fixed body are alternately opened and closed to complete the operation task, and the seal of the half-sealing sealer will not wear out.

The snubbing workover rig uses a well fluid cylinder between the floating half-sealing and sealing device and the fixed semi-sealing device to seal the liquid coming out of the wellhead. Swimming sealer, fixed half sealer, and slips switch alternately to complete the workover operation under pressure, and realize the sealing of the half sealer without wear. However, this has resulted in a large upward force of the hydraulic pressure in the well to push the second cylinder. When the oil pipe is lowered, the force of the power cylinder driving the pulley and the steel rope must be greater than the upward force of the hydraulic pressure in the well to the second cylinder. Only in this way can the oil pipe Going into the well, and the lifting speed is very slow, which leads to the need for a large installed power of the whole machine.

Utility model content

In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the utility model is to provide a tubing tripping device in a snubbing workover rig, which can solve the problem of hydraulic pressure in the well on the second cylinder when running the tubing. The problem of large jacking force.

Concrete technical scheme of the present utility model is:

A tubing tripping device in a snubbing workover rig, characterized in that it comprises:

A well fluid cylinder system, which includes a first cylinder with an axis, and a second cylinder sleeved with the first cylinder, and the second cylinder can move along the axial direction of the first cylinder sliding relative to the first cylinder;

A first fixing mechanism, which includes a first body fixed to the first cylinder, and the first body has a first channel communicating with the working chamber of the first cylinder;

A floating body, which is located above the second fixing mechanism and can limit the position of the oil pipe;

a second fixing mechanism, which includes a second body fixed to the second cylinder;

A fixed body, which is located below the first fixing mechanism and can limit the position of the oil pipe;

A balance cylinder, which includes a balance cylinder cylinder fixed on the second body, a piston rod fixed on the first body, and the piston rod is penetrated and fixed in the balance cylinder cylinder, so A balance cylinder piston is connected to the piston rod, and the balance cylinder piston, the piston rod and the balance cylinder cylinder form a working chamber of the balance cylinder, and the balance cylinder piston can move along the axial direction of the first cylinder. Sliding relative to the cylinder barrel of the balance cylinder, the piston rod has a second channel inside, and the second channel communicates with the first channel and the working chamber of the balance cylinder.

Preferably, the balance cylinder is a single-acting oil cylinder, the chamber with the piston rod in the balance cylinder is a working chamber, and the chamber without the piston rod communicates with the atmosphere.

Preferably, there are two balance cylinders, which are symmetrically arranged on the first body and the second body, and the sum of the cross-sectional areas of the working chambers of the balancing cylinders is equal to the cross-sectional area of the working chambers of the second cylinder.

Preferably, the piston rod is provided with a first through hole at the end of the connecting direction with the balance cylinder piston, and the first through hole communicates with the second channel and the working chamber of the balance cylinder, so The lower part of the piston rod is provided with a second through hole communicating with the second channel and the first channel.

Preferably, the side wall of the balance cylinder is provided with a centralizer support ring for centralizing.

Preferably, the traveling body includes traveling slips, a turntable, and a traveling semi-sealing sealer.

The utility model has the following significant beneficial effects:

The balance cylinder and the piston rod are respectively fixed on the first body and the second body. When the liquid pressure generates an upward thrust on the second cylinder, since the working chamber of the second cylinder and the balance cylinder are connected, the second cylinder The liquid in the second cylinder will flow into the balance cylinder through the first channel and the second channel, and the liquid pressure in the second cylinder will return to the original level and remain almost unchanged, so the required upward thrust becomes smaller. Thereby reducing the load of the power cylinder during the workover operation, thereby reducing the installed power of the whole machine.

The second cylinder is connected with the working chamber of the balance cylinder, and the liquid in the balance cylinder and the second cylinder moves back and forth repeatedly when the oil pipe is lifted out of the well or lowered into the well, so that the liquid in the well is effectively blocked in the well It cannot flow out, thus avoiding the pollution of the well fluid to the ground.

Description of drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help the understanding of the present utility model, and do not specifically limit the shapes and proportional dimensions of the various components of the present utility model. Under the teaching of the utility model, those skilled in the art can choose various possible shapes and proportional dimensions according to specific conditions to implement the utility model.

Fig. 1 is a structural schematic diagram of the tripping process state 1 of the tubing tripping device in the snubbing workover rig of the present invention.

Fig. 2 is a structural schematic diagram of the tripping process state 2 of the tubing tripping device in the snubbing workover rig of the present invention.

The reference signs of the above drawings: 1, fixed body; 11, wellhead cross; 12, full-sealing sealer; 13, spare half-sealing sealer; 14, half-sealing sealer; 15, fixed slips; 2. Swimming body; 21. Swimming slips; 22. Turntable; 23. Swimming semi-sealing well sealing device; 3. Steel rope pulley system; 31. Floor pulley; 32. Down-pressing steel rope; 33. Lifting Steel rope; 34, sky pulley; 5, well fluid cylinder system; 51, second cylinder barrel; 52, first cylinder barrel; 53, well fluid sealing body; 54, soft seal; 55, first sealing cylinder ring; 6 , balance cylinder; 61, balance cylinder barrel; 62, first lock nut of balance cylinder; 63, inner seal of balance cylinder; 64, second seal; 65, piston rod seal; 66, piston rod; 661, first pass Hole; 662, second through hole; 663, second channel; 67, plug; 68, first seal; 69, balance cylinder piston; 610, third seal; 7, first fixing mechanism; 71, the first 1 body; 711, first channel; 72, fourth seal; 73, snap ring; 74, lock nut; 8, second fixing mechanism; 81, second body; 82, balance cylinder back nut; 83, balance cylinder The second lock nut; 84, the second sealing cylinder ring; 9, the centralizer.

Detailed ways

The details of the utility model can be understood more clearly in combination with the accompanying drawings and the description of the specific implementation of the utility model. However, the specific implementations of the utility model described here are only for the purpose of explaining the utility model, and cannot be construed as limiting the utility model in any way. Under the teaching of the present utility model, any possible deformation based on the present utility model can be conceived by a skilled person, and these should be regarded as belonging to the scope of the present utility model.

Fig. 1 is a structural schematic diagram of the tripping process state 1 of the tubing tripping device in the snubbing workover rig of the present utility model, as shown in Fig. 1, a tubing tripping device in the snubbing workover rig, its characteristics That is, it includes: a well fluid cylinder system, which includes a first cylinder with an axis, and a second cylinder sleeved with the first cylinder, and the second cylinder can be opposed along the axis of the first cylinder The first cylinder slides; the first fixing mechanism includes a first body fixed to the first cylinder, and the first body has a first channel communicating with the working chamber of the first cylinder; the floating body is located at The top of the second fixing mechanism can limit the oil pipe; the second fixing mechanism includes a second body fixed with the second cylinder; the fixed body is located below the first fixing mechanism and can limit the oil pipe; The balance cylinder includes a balance cylinder barrel fixed on the second body, a piston rod fixed on the first body, the piston rod is fixed in the balance cylinder barrel, and the balance cylinder piston is connected to the piston rod. The balance cylinder piston, piston rod and balance cylinder cylinder form the working chamber of the balance cylinder. The balance cylinder piston can slide relative to the balance cylinder cylinder along the axis direction of the first cylinder. There is a second channel inside the piston rod. The second channel and The first channel communicates with the working chamber of the balancing cylinder.

Specifically, the well fluid cylinder system 5 includes a second cylinder 51 and a first cylinder 52 sleeved outside the second cylinder 51. The second cylinder 51 and the first cylinder 52 can be relatively aligned along the axial direction. Sliding, a soft seal 54 and a well fluid sealing body 53 are connected to one end of the first cylinder 52, so as to ensure the sealing performance of the second cylinder 51 and the first cylinder 52 in the process of relative sliding, preventing the second cylinder from 51 The material in the working cavity leaks out. The first fixing mechanism 7 includes a first body 71 with a first channel 711, the first cylinder 52 is penetrated in the middle of the first body 71, and the sealing effect is achieved by the first sealing cylinder ring 55 between the two. A channel 711 is opened inside the first body 71 and communicates with the working chambers of the first cylinder 52 and the second cylinder 51 . The second fixing mechanism 84 includes a second body 81, the second cylinder 51 is passed through the middle of the second body 81, and is fixedly connected with the second body 81, and the connection between the second body 81 and the second cylinder 51 is sleeved. There is a second sealing cylinder ring 84 for ensuring the sealing effect. Balance cylinder 6, it comprises balance cylinder barrel 61, puts balance cylinder piston 69 in balance cylinder barrel 61, is connected to the piston rod 66 of balance cylinder piston 69, balance cylinder piston 69 and balance cylinder barrel 61 can be opposite along the axis Direction slide. The balance cylinder 6 is a single-acting oil cylinder, the chamber with the piston rod 66 in the balance cylinder 6 is a working chamber, and the chamber without the piston rod 66 communicates with the atmosphere. The balance cylinder piston 69 can be a hollow circular tube, and the hollow part of the circular tube is the second channel 663. One end of the balance cylinder piston 69 is fixedly connected to the middle part of the balance cylinder piston 69, and the piston rod 66 is in the direction of connection with the balance cylinder piston 69. A first through hole 661 is opened at the end of the first through hole 661 so that the second passage 663 communicates with the working chamber of the balance cylinder 61 . The piston rod 66 is provided with a second through hole 662 communicating with the second passage 663 and the first passage 711 at the joint with the first body 71, so that the working chamber of the balance cylinder 6 can It communicates with the working chamber of the second cylinder 51 . At the second through hole 662 , a fourth sealing member 72 is provided at the contact point between the piston rod 66 and the first body 71 to ensure the sealing effect at the second through hole 662 . The end of the piston rod 66 facing away from the balance cylinder piston 69 is provided with a first sealing member 68 and a plug 67 for sealing, so that the second channel 663 in the piston rod 66 is separated from the outside world. The piston rod 66 passes through the first body 71 to provide a lock nut 74 and a snap ring 73 for sealing. The balance cylinder barrel 61 is passed through and fixed in the second body 81 , and is fixed by the balance cylinder back nut 82 and the balance cylinder first lock nut 62 . The side wall of the balance cylinder 61 is circumferentially provided with a centralizer support ring for centralizing. The centralizer support ring can be connected with the centralizer 9, and one end of the balance cylinder cylinder 61 in the direction where the piston rod 66 passes is provided with a Sealed second seal 64 , balance cylinder internal seal 63 , balance cylinder second lock nut 83 , and piston rod seal 65 . A third seal 610 is provided between the balance cylinder piston 69 and the balance cylinder cylinder 61 to enhance the sealing effect between the balance cylinder piston 69 and the balance cylinder cylinder 61 . A floating body 2 is fixedly connected to the upper ends of the second body 81 and the second cylinder 51 , and the floating body 2 includes floating slips 21 , a rotating disk 22 , and a floating semi-sealing sealing device 23 . Steel rope pulley system 3 comprises ground pulley 31, presses down steel rope 32, lifts steel rope 33, day pulley 34. The turntable 22 is used to connect the lifting steel rope 33 and the pressing steel rope 32 in the snubbing workover rig, and the lifting steel rope 33 and the pressing steel rope 32 are controlled by the sky pulley 34 and the ground pulley 31 to drive the turntable 22 up and down. movement, thereby driving the floating body 2, the second body 81, the balance cylinder 61, and the second cylinder 51 to move up and down. The floating slips 21 can be used to tighten the tubing during operation, and the floating half-sealing sealer 23 is used to seal and separate. The fixed body 1 connected to the bottom of the first cylinder 52 includes a fixed slip 15 , a semi-sealed well sealer 14 , a spare half-sealed well sealer 13 , a full-sealed well sealer 12 , and a wellhead spool 11 . The fixed slips 15 are used to clamp the tubing during operation, the semi-sealed well sealer 14 is used to seal and separate the upper and lower sides, and the wellhead spool 11 is used to connect the casing and the snubbing workover rig. During operation, the oil pipe is passed through the floating body 2 , the first body 71 , the second cylinder 51 , the first cylinder 52 , the second body 81 , and the fixed body 1 to remove the oil pipe.

The working principle of the utility model is as follows:

During operation, the wellhead spool 11 is connected with the oil well casing, and the oil pipe is passed through the floating body 2, the first body 71, the second cylinder 51, the first cylinder 52, the second body 81, and the fixed body 1. The status is shown in Figure 1. When the tubing is pulled up during the snubbing operation, the floating half-sealing sealer 23 is closed, the floating slips 21 are closed to clamp the oil pipe, and the fixed slips 15 and the half-sealing sealer 14 of the fixed body 1 are opened. By driving the lifting steel rope 33, the lifting steel rope 33 drives the turntable 22, and then drives the entire floating body 2 to move upward. Since the floating slip 21 locks the oil pipe, the oil pipe is lifted up through the floating slip 21, as shown in Fig. 2 is a schematic structural diagram of the tripping process state 2 of the tubing tripping device in the snubbing workover rig of the present invention, and the state after being lifted is shown in FIG. 2 . During this process, the second cylinder 51 slides away from the second cylinder 51, the volume of the working chamber of the second cylinder 51 becomes larger, and the balance cylinder 61 is lifted up under the drive of the second body 81, so that The volume of the working chamber in the balance cylinder 6 becomes smaller, because the working chamber in the second cylinder 51 communicates with the working chamber in the balance cylinder 6 through the first passage 711 and the second passage 663, so the working chamber of the balance cylinder 6 The liquid or gas will flow into the working chamber in the second cylinder 51. During this process, the pressures in the two working chambers are kept in a balanced state, and will not increase or decrease, which reduces the lifting pressure. The force required at the time can reduce the installed power of the whole machine. When the tubing tripping device in this snubbing workover rig is reset, the floating semi-sealing sealer 23 is opened, the floating slips 21 are opened, and the fixed slips 15 of the fixed body 1 are closed to lock the tubing, semi-sealing The well 14 is closed. By pressing down on the steel rope 32, the swimming body 2, the balance cylinder 61, and the second body 81 move downward, and the second cylinder 51 slides and shrinks relative to the second cylinder 51, and the working chamber in the second cylinder 51 The volume becomes smaller, and the volume of the working chamber of the balance cylinder 6 becomes larger. Since the working chamber in the second cylinder 51 communicates with the working chamber in the balance cylinder 6 through the first passage 711 and the second passage 663, the second cylinder The liquid or gas in the working chamber in 51 flows into the working chamber of the balance cylinder 6, and the pressure in the two working chambers is kept in a balanced state during the process, and will not increase or decrease, thereby reducing the The active force required when pressing down on the steel rope 32 reduces the installed power of the complete machine. According to the cycle operation of the above steps, the floating semi-sealing and sealing device 23 and floating slips 21 on the floating body 2 and the fixed slips 15 and semi-sealing and sealing device 14 on the fixed body 1 are opened and closed alternately, continuously The oil pipe is lifted up section by section, and finally the operation task of lifting the oil pipe is completed. At the same time, the liquid in the second cylinder 51 and the balance cylinder 61 can flow back and forth mutually, and the phenomenon of internal pressure increase will not occur, so the liquid in the well will not be compressed by the pressure, thereby solving the problem of the well fluid cylinder. The problem of pollution in liquid discharges.

When the tubing is run under pressure, the initial state is as shown in Figure 2, the floating half-sealed sealer 23 is closed, the floating slips 21 are closed to clamp the tubing, the fixed slips 15 of the fixed body 1, the half-sealed The well 14 is opened. By pressing down the steel rope 32, the floating body 2, the balance cylinder 61, and the second body 81 move downward. Since the floating semi-sealing sealer 23 is closed, the floating slips 21 are closed to clamp the oil pipe, so the oil pipe together Moving down, it is fed down into the casing. During this process, the second cylinder 51 slides and shrinks relative to the second cylinder 51, the volume of the working chamber in the second cylinder 51 becomes smaller, and the volume of the working chamber in the balance cylinder 6 becomes larger. The working chamber of the balance cylinder 6 communicates with the working chamber of the balance cylinder 6 through the first passage 711 and the second passage 663, so the liquid or gas in the work chamber of the second cylinder 51 flows into the work chamber of the balance cylinder 6, where During the process, the pressures in the two working chambers are kept in a balanced state without increasing or decreasing, which reduces the required force when pressing down on the steel rope 32, thereby reducing the installed power of the whole machine. When the tubing tripping device in this snubbing workover rig is reset, the floating semi-sealing sealer 23 is opened, the floating slips 21 are opened, and the fixed slips 15 of the fixed body 1 are closed to lock the tubing, semi-sealing The well 14 is closed. By driving the lifting steel rope 33, the lifting steel rope 33 drives the turntable 22, and then drives the entire floating body 2 to move upward. Since the floating slip 21 is opened and the oil pipe is not locked, the oil pipe will not move upward during this process. . According to the cycle operation of the above steps, the floating semi-sealing and sealing device 23 and floating slips 21 on the floating body 2 and the fixed slips 15 and semi-sealing and sealing device 14 on the fixed body 1 are opened and closed alternately, continuously The tubing is lowered into the well section by section, and the operation task of lowering the tubing is finally completed.

The balance cylinder 61 and the piston rod 66 are respectively fixed on the first body 71 and the second body 81. When the liquid pressure generates an upward thrust on the second cylinder 51, due to the working chamber of the second cylinder 51 and the balance cylinder 6 is connected, the liquid in the second cylinder 51 will flow into the balance cylinder 61 through the first passage 711 and the second passage 663, and the liquid pressure in the second cylinder 51 will return to the original level and remain almost unchanged. Therefore, the required upward thrust becomes smaller, thereby reducing the load on the power cylinder during the workover operation, thereby reducing the installed power of the whole machine.

The working chambers of the second cylinder 51 and the balance cylinder 6 are connected, and the liquid in the balance cylinder 61 and the second cylinder 51 moves back and forth repeatedly when the oil pipe is lifted out of the well or lowered into the well, so that the liquid in the well Effective plugging cannot flow out in the wellbore, thus avoiding the pollution of the well fluid to the ground.

In a preferred embodiment, there may be two balancing cylinders 6, which are symmetrically arranged on the first body and the second body, and the sum of the cross-sectional areas of the working chambers of the balancing cylinders 6 is equal to that of the working chambers of the second cylinder barrel 51. cross-sectional area, so that during operation, the liquid can always maintain an equal volume when it flows between the balance cylinder 61 and the second cylinder 51, and there will be no volume loss in the balance cylinder 61 and the second cylinder 51. The pressure generated by different sizes can better reduce the power of workover operations.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present utility model, and its purpose is to enable those familiar with this technology to understand the content of the present utility model and implement it accordingly, and not to limit the protection scope of the present utility model. All equivalent changes or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.

Claims (6)

1. the oil pipe running and pulling device in pressure balance workover rig, it is characterized in that, it comprises:

Well fluid cylinder system, it comprises first cylinder barrel and second cylinder barrel mutually sheathed with described first cylinder barrel with an axis, and described second cylinder barrel can slide along relatively described first cylinder barrel of the axis direction of described first cylinder barrel;

First fixed mechanism, it comprises the first noumenon fixed with described first cylinder barrel, and described the first noumenon has the first passage be connected with the working chamber of described first cylinder barrel;

Loose body, its top being positioned at the second fixed mechanism also can be spacing to oil pipe;

Second fixed mechanism, it comprises the second body fixed with described second cylinder barrel;

Fixed body, its below being positioned at described first fixed mechanism also can be spacing to oil pipe;

Compensating cylinder, it comprises the compensating cylinder cylinder barrel be installed on described second body, be installed in the piston rod on described the first noumenon, described piston rod wears and is fixed in described compensating cylinder cylinder barrel, described piston rod is connected with compensating cylinder piston, described compensating cylinder piston, described piston rod and described compensating cylinder cylinder barrel form the working chamber of compensating cylinder, described compensating cylinder piston can slide along the axis direction of described first cylinder barrel relative to described compensating cylinder cylinder barrel, described piston rod inner has second channel, described second channel is connected with the working chamber of described first passage and described compensating cylinder.

2. the oil pipe running and pulling device in pressure balance workover rig according to claim 1, it is characterized in that, described compensating cylinder is one-way cylinder, and the chamber in described compensating cylinder with described piston rod is working chamber, and the chamber without described piston rod is connected with air.

3. the oil pipe running and pulling device in pressure balance workover rig according to claim 1, it is characterized in that, described compensating cylinder is two, and it is symmetricly set on the first noumenon and the second body, and the sectional area sum of the working chamber of described compensating cylinder equals the sectional area of the working chamber of described second cylinder barrel.

4. the oil pipe running and pulling device in pressure balance workover rig according to claim 1, it is characterized in that, described piston rod offers the first through hole at the end of the closure with described compensating cylinder piston, described first through hole is connected with the working chamber of described second channel, described compensating cylinder, and described underpart of the piston rod offers the second through hole being communicated with described second channel and described first passage.

5. the oil pipe running and pulling device in pressure balance workover rig according to claim 1, is characterized in that, described compensating cylinder cylinder barrel side wall ring is to the centralizer filler ring be provided with for playing centralizing function.

6. the oil pipe running and pulling device in pressure balance workover rig according to claim 1, is characterized in that, described loose body comprises traveling slip, rotating disk, moves about and partly seal blowout preventer.