CN109944566B

CN109944566B - Pressureless plug throwing device

Info

Publication number: CN109944566B
Application number: CN201910382890.XA
Authority: CN
Inventors: 李加强; 张博; 曹扬; 金龙; 王洪涛; 刘艳庆; 李永珍
Original assignee: Daqing Petroleum Administration Bureau; China National Petroleum Corp
Current assignee: Daqing Petroleum Administration Bureau; China National Petroleum Corp
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2021-05-07
Anticipated expiration: 2039-05-09
Also published as: CN109944566A

Abstract

A pressure-free plug throwing device. The main stifled ware of throwing that has now needs the pump truck to suppress, the anchoring insecure, the poor problem of sealed effect of solving. The method is characterized in that: the upper part of the locking nut (1) is connected with a locking iron (9), a front plug sleeve (4) and a front rubber ring (5) are sequentially sleeved outside the locking iron (9) from bottom to top, a spring (3) is arranged between the locking nut (1) and the front plug sleeve (4), the outer wall of the upper section of the locking iron (9) is conical, two axial sliding grooves are formed in the outer surface of the conical shape, sliding blocks (10) are connected onto the sliding grooves, and the upper end of the locking iron (9) is connected with a plug (11); the locking device is characterized in that a locking rod (2) is arranged in a cavity in the lower end of the locking iron (9), a steel ball (12) is inlaid on the side wall of the locking iron (9), and a circumferential clamping groove (13) is formed in the outer wall of the locking rod (2). The pressureless plug throwing device has the advantages of no need of pump truck pressuring, no need of steel wire throwing, high plug throwing success rate, firm anchoring and good sealing effect.

Description

Pressureless plug throwing device

Technical Field

The invention relates to the field of oil fields, in particular to a pressureless plug throwing device.

Background

In order to better protect oil-gas layers and ecological environment and improve water injection efficiency in oil fields, more and more wells are constructed by adopting an operation process under pressure, the annular pressure of an oil sleeve in the operation under pressure is controlled by a wellhead blowout preventer, and a plugging device is required to plug an oil pipe for pressure control in the oil pipe, so that the pressure control is realized. The prior common plug throwing device has the following problems: 1. the plug throwing device can not throw plugs to a preset position, so that the plug throwing device can be seriously bent, broken, deformed and the like, and the secondary plug throwing cost is increased; 2. the rubber sleeve is seriously worn and has poor sealing effect in the plugging process, and the oil pipe cannot be plugged to realize operation under pressure; 3. after the plug is thrown in place, the anchoring is not firm, and the well with high pressure even leads to the flying-out of the plug throwing device, thereby causing accidents; 4. the pump truck and the water tank truck need to be equipped for pressurizing, or the steel wire rope winch is used for throwing, so that the cost is increased.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the pressureless plug throwing device which has the advantages of no need of pumping by a pump truck, no need of throwing steel wires, high plug throwing success rate, firm anchoring and good sealing effect.

The technical scheme of the invention is as follows: a pressure-free plug throwing device comprises a locking nut, wherein the upper part of the locking nut is connected with a lock iron, a front plug sleeve and a front rubber ring are sequentially sleeved outside the lock iron from bottom to top, a spring is arranged between the locking nut and the front plug sleeve, the outer wall of the upper section of the lock iron is conical, two axial sliding grooves are formed in the outer surface of the conical shape, sliding blocks are connected onto the sliding grooves, and the upper end of the lock iron is connected with a plug; the locking device is characterized in that a locking rod is arranged in a cavity in the lower end of the locking iron, the lower end of the locking rod extends out of the locking nut, a steel ball is inlaid on the side wall of the locking iron, and a circumferential clamping groove is formed in the outer wall of the locking rod.

And a rear plug sleeve and a rear rubber ring are sequentially arranged between the front rubber ring and the check ring from bottom to top, the check ring is arranged at the upper end of the rear rubber ring, and the upper part of the check ring is propped against the step on the outer wall of the lock iron.

The front plug sleeve is matched with the front rubber ring through an inclined plane, and the rear plug sleeve is matched with the rear rubber ring through an inclined plane.

The sliding block is composed of two semicircular sliding block single bodies.

The invention has the following beneficial effects: by adopting the scheme, the pressureless plug throwing device is suitable for blocking in an oil pipe during construction of water injection well under-pressure operation, can be repeatedly used, and can be independently replaced when a rubber cylinder is damaged, so that the cost is reduced; the operation is simple, the plugging speed is high, and plugging can be completed in about one hour generally; the pump truck is not required to be pressed, the cable is not required to be transported and thrown, the use of equipment is reduced, and the operation cost is saved; the rubber cylinder reaches the plugging position to be released, so that the abrasion of the rubber cylinder is reduced, and repeated plugging is avoided; the sealing effect is good, and the anchoring is firm.

Drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure, 1-locking nut, 2-locking rod, 3-spring, 4-front sleeve, 5-front rubber ring, 6-rear sleeve, 7-rear rubber ring, 8-retainer ring, 9-locking iron, 10-sliding block, 11-plug, 12-steel ball and 13-clamping groove.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

as shown in figure 1, the pressureless plug throwing device comprises a locking nut 1, wherein a locking iron 9 is connected to the inner thread of the upper end of the locking nut 1, a front plug sleeve 4, a front rubber ring 5, a rear plug sleeve 6 and a rear rubber ring 7 are sequentially sleeved on the outside of the locking iron 9 from bottom to top, and a check ring 8 is arranged at the upper end of the rear rubber ring 7. The front plug sleeve 4 is matched with the front rubber ring 5 through an inclined plane, the rear plug sleeve 6 is matched with the rear rubber ring 7 through an inclined plane, and the front rubber ring 5 is sleeved outside the rear plug sleeve 6. The spring 3 is sleeved outside the upper end of the locking nut 1 and the lower end of the front plug bush 4, and two ends of the spring 3 are propped against the steps of the locking nut 1 and the front plug bush 4. The locking iron 9 can be formed by connecting an upper section and a lower section, a step is formed between the two sections, and the upper part of the retainer ring 8 is blocked on the step outside the locking iron 9. The outer wall of lock iron 9 upper segment is big end down's toper, and it has two axial spouts to open on the conical surface, is connected with slider 10 on the spout, and slider 10 comprises two semi-circular slider monomers, and slider 10 can slide along the spout, and when the lapse, slider 10 outwards opens. The upper end of the lock iron 9 is connected with a screw plug 11, a cavity is arranged in the lower end of the lock iron 9, a lock rod 2 is arranged in the cavity, the lock rod 2 is a stepped shaft, and the lower end of the lock rod extends out of the lock nut 1. A plurality of steel balls 12 are embedded on the side wall of the cavity at the lower end of the lock iron 9, and a circumferential clamping groove 13 is formed in the outer wall of the lock rod 2. When the steel ball 12 corresponds to the straight rod part of the lock rod 2, the lock rod 2 pushes the steel ball 12 outwards, so that the steel ball 12 is clamped on the inclined surface of the inner wall of the front plug bush 4; when the steel ball 12 corresponds to the slot 13 on the lock rod 2, the steel ball 12 can retract inwards into the slot 13.

When the plug is in operation, the preposing device is firstly put into the oil pipe by the dispenser, then the plug is put into the oil pipe by the dispenser, and the steel ball 12 is clamped on the inclined plane in the front plug sleeve 4 under the driving of the lock iron 9, so as to drive the front plug sleeve 4 to move downwards together and compress the spring 3. When the locking rod 2 at the lower end of the plug throwing device touches the front device, the locking rod 2 does not move downwards any more, the whole plug throwing device continues to move downwards, when the steel ball 12 moves to a position corresponding to the upper clamping groove 13 of the locking rod 2, the steel ball 12 retracts into the clamping groove 13, so that the front plug sleeve 4 is separated from the control of the steel ball 12 and moves upwards under the action of the spring 3, the inclined plane at the upper end of the front plug sleeve 4 is inserted into the front rubber ring 5, the front rubber ring 5 is expanded, and similarly, the rear rubber ring 7 is also expanded, and the oil pipe is sealed. At the moment, the pressure of the oil pipe is pushed up, the locking iron 9 moves upwards, and the sliding block 10 moves downwards along the sliding groove on the locking iron 9, so that the oil pipe is fixed, and the oil pipe is blocked.

Claims

1. The utility model provides a exempt from to suppress and throw stifled ware, includes lock nut (1), its characterized in that: the upper part of the locking nut (1) is connected with a locking iron (9), a front plug sleeve (4) and a front rubber ring (5) are sequentially sleeved outside the locking iron (9) from bottom to top, a spring (3) is arranged between the locking nut (1) and the front plug sleeve (4), the outer wall of the upper section of the locking iron (9) is conical, two axial sliding grooves are formed in the outer surface of the conical shape, sliding blocks (10) are connected onto the sliding grooves, and the upper end of the locking iron (9) is connected with a plug (11); a lock rod (2) is arranged in a cavity in the lower end of the lock iron (9), the lower end of the lock rod (2) extends out of the lock nut (1), a steel ball (12) is embedded in the side wall of the lock iron (9), and a circumferential clamping groove (13) is formed in the outer wall of the lock rod (2); and a rear plug sleeve (6) and a rear rubber ring (7) are sequentially arranged between the front rubber ring (5) and the check ring (8) from bottom to top, the check ring (8) is arranged at the upper end of the rear rubber ring (7), and the upper part of the check ring (8) is propped against the step on the outer wall of the lock iron (9).

2. The pressureless plug feeder according to claim 1, wherein: the front plug sleeve (4) is matched with the front rubber ring (5) through an inclined plane, and the rear plug sleeve (6) is matched with the rear rubber ring (7) through an inclined plane.

3. The pressureless plug feeder according to claim 2, wherein: the sliding block (10) is composed of two semicircular sliding block single bodies.