CN204371230U - A kind of two eccentric throwing rod-type bleeder - Google Patents

Abstract

A double eccentric throwing rod type oil drainer, including a drainer housing, a radial step hole is provided in the middle of the oil drainer housing, and a shearing pin is provided in the step hole; the oil drainer housing and the shearing pin pass through The O-ring is sealed with the copper washer, and the outer end of the shearing pin is fixed by the retaining ring; there is a groove outside the shearing pin; the upper part of the oil drainer shell is provided with a cone surface hole; the middle part of the oil drainer shell is provided with a center hole to drain There are threaded holes in the lower part of the device housing; during normal mining operations, the double eccentric plunger type oil drainer is connected between the pump barrel and the fixed valve assembly, relying on its own double seal structure to ensure the smooth progress of mining operations; When pulling up the tubing string, after the piston pulls out the tubing, it hits the groove at the end of the shearing pin by adding a broken rod to the wellhead, causing it to break from the groove, and then the inside and outside of the tubing communicate through the pin hole, and the liquid in the tube flows to the Out of the wellbore, to achieve the purpose of smooth oil drainage; it has the characteristics of simple structure, convenient operation, reliable oil drainage and reusability.

Description

A double eccentric throwing rod type oil drainer

technical field

The utility model relates to an oil drainer, in particular to a double eccentric throwing rod type oil drainer, which is mainly used for draining the oil and water in the oil pipe into the well before the oil field inspection pump lifts out the pipe string, so as to avoid The oil and water fall to the ground and pollute the environment.

Background technique

In order to prevent the crude oil and sewage in the oil pipe from being brought to the ground to pollute the environment, affect the construction progress, and cause waste during the pumping operation such as pump inspection and pumping, the oil drain is usually used in the oil production string. Therefore, whether the oil drainer can drain the oil and ensure the sealing during production becomes the key technology when the oil drainer is used for pump inspection and other pipe string operations.

The development of oil drainer has gone through hydraulic oil drainer, lifting type oil drainer and percussion type oil drainer. In the field use, it is found that there are different limitations and shortcomings, and there are also certain faults. The common faults are: ① No oil leakage or no smooth oil leakage; ② The sealing ring is easily damaged and invalid; ③ The shear pin has poor seal and is easy to puncture and leak.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the purpose of this utility model is to provide a double eccentric throwing rod type oil drainer, which solves the limitations of the current oil drainer and effectively avoids the problems that occur during the use of conventional oil drainers. Failure; it has the characteristics of reliable sealing, not easy to damage, not easy to puncture and leak by shearing pins, replaceable and reliable oil leakage.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a double eccentric throwing rod type oil drainer, including an oil drainer housing, a radial step hole is provided in the middle of the oil drainer housing, and the step hole is provided with Shearing pin; the oil drain housing and the shearing pin are sealed by an O-ring and a copper gasket, and the outer end of the shearing pin is fixed by a retaining ring; there is a groove outside the shearing pin; the upper part of the oil drainer housing is provided with a cone surface hole ; There is a central hole in the middle of the drainer housing, and a threaded hole in the lower part of the drainer housing.

The tapered surface hole, central hole and threaded hole are not on the same center line, and the three have eccentric distances, forming a double eccentric structure.

One side of the tapered hole is provided with several axial through holes.

The shear pin is a threaded hollow pin.

The material of the gasket is copper.

The utility model has the following advantages during operation:

①The eccentricity of the cone surface enables the throwing rod to effectively hit the weak part of the groove of the shearing pin and break, and then drain the oil smoothly; at the same time, it also reserves enough positions for several axial through holes to increase the flow area;

②The eccentricity of the center hole increases the effective length of the connection thread between the shear pin and the oil drainer housing, avoiding the phenomenon that the shear pin has poor sealing performance and is easy to puncture due to insufficient thread length; at the same time, the size of the center hole can be appropriately increased. flow area;

③The double seal structure between the shear pin and the drainer housing 1 makes the seal reliable and not easy to damage.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1—oil drainer housing; 2—gasket; 3—O-ring; 4—shear pin; 5—retaining ring; 6—taper hole; 7—axial through hole; 8—center hole; Groove; 10—pin hole; 11—threaded hole.

Detailed ways

Below in conjunction with accompanying drawing, structural principle and working principle of the present utility model are described in further detail.

Referring to Fig. 1, a double eccentric throwing rod type oil drainer includes an oil drainer housing 1, a radial step hole is provided in the middle of the oil drainer housing 1, and a shear pin 4 is provided in the step hole; The body 1 and the shear pin 4 are sealed by an O-ring 3 and a copper gasket 2, and the outer end of the shear pin is fixed by a retaining ring 5; a groove 9 is provided outside the shear pin 4; The face hole 6; the central hole 8 is provided in the middle part of the drainer housing 1, and the threaded hole 11 is provided in the lower part of the drainer housing 1.

The tapered surface hole 6, the central hole 8 and the threaded hole 11 are not on the same center line, and the three have eccentric distances, forming a double eccentric structure.

Several axial through holes 7 are provided on one side of the tapered surface hole 6 .

The shear pin is a threaded hollow pin.

The material of the gasket 2 is copper.

The working principle of the utility model is:

During normal mining operations, the double eccentric plunger type drainer is connected between the pump barrel and the fixed valve assembly, relying on its own double sealing structure to ensure the smooth progress of mining operations;

When the pump is checked and pulled up the tubing string, after the piston lifts out the tubing, it hits the groove at the end of the shearing pin by feeding a broken rod to the wellhead, causing it to break from the groove, and then through the pin hole, the inside and outside of the tubing are connected, and the inside of the tubing is connected. The liquid flows out of the wellbore to achieve the purpose of smooth oil drainage.

Claims (5)

1. A double eccentric throwing rod type oil drainer, including an oil drainer housing (1), characterized in that a radial step hole is provided in the middle of the oil drainer housing (1), and a shear pin is provided in the step hole (4); The oil drain housing (1) and the shear pin (4) are sealed by the O-ring (3) and the copper gasket (2), and the outer end of the shear pin is fixed by the retaining ring (5); the shear pin (4) There is a groove (9) on the outside; the upper part of the drainer housing (1) is provided with a conical hole (6); the middle part of the drainer housing (1) is provided with a central hole (8), and the drainer housing (1) The lower part of the body (1) is provided with a threaded hole (11). 2. A double eccentric throwing rod type oil drainer according to claim 1, characterized in that, said conical surface hole (6), center hole (8) and threaded hole (11) are not on the same center line, three Those with eccentric distance constitute a double eccentric structure. 3. A double eccentric plunger type oil drainer according to claim 1 or 2, characterized in that several axial through holes (7) are provided on one side of the tapered surface hole (6). 4. A double eccentric plunger type oil drainer according to claim 1, characterized in that, the shear pin is a hollow pin with threads. 5. The double eccentric plunger type oil drainer according to claim 1, characterized in that, the material of the washer (2) is copper.