CN210685896U

CN210685896U - Tubing anchor

Info

Publication number: CN210685896U
Application number: CN201921821192.7U
Authority: CN
Inventors: 赵德奎; 李吉伦; 朱勇; 赵雨萱; 赵浩宇
Original assignee: Shandong Jinbo Petroleum Equipment Co ltd
Current assignee: Shandong Jinbo Petroleum Equipment Co ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-06-05
Anticipated expiration: 2029-10-28

Abstract

An oil pipe anchor is characterized in that an outer shoulder is arranged outside an inner pipe, a pressure transfer hole is formed in the inner pipe, an upper sealing ring is arranged on the section of the outer shoulder, an inner shoulder is arranged inside a cone, a boss is arranged in the upper portion of the cone, a lower sealing ring is arranged in the lower portion of the cone, the cone is sleeved outside the inner pipe, the upper portion of the cone is matched with the section of the outer shoulder, a gap between the upper sealing ring and the cone is sealed by the upper sealing ring, the lower sealing ring is arranged below the pressure transfer hole, the boss is arranged below the outer shoulder, a slip sleeve is sleeved outside the cone, a slip is arranged on the cone through a window of the slip sleeve, an inner conical surface of the slip is matched with an outer conical surface of the cone, dovetail teeth of the slip are inserted into a dovetail groove of the cone, external threads of an anchor release joint are connected with internal threads on the lower portion of the slip sleeve, internal threads of the anchor release joint are connected, the injected wax substance is filled in the pressure transmission hole and the annular cavity between the inner pipe and the cone, and the upper part of the cone is connected with a suspension joint.

Description

Tubing anchor

Technical Field

The utility model belongs to a tubular column anchoring device, especially an oil pipe anchor that oil field oil recovery well was used.

Background

When the oil well pumps oil, the liquid column load is alternatively transferred on the oil pipe and the sucker rod along with the change of the up-down stroke of the oil pumping unit, so that the oil pipe is lengthened and shortened, and the low efficiency of the oil pumping unit is caused; the yield is reduced; the bending of the oil pipe reduces the service life, and the alternating action of the liquid column load on the oil pipe can also cause the oil pipe to be tripped and fall into the well. In order to avoid the problems, a tubing anchor is used on site for fixing the tubing and preventing the fluid column load from alternately acting on the tubing to stretch. In the process of construction of some oil-water wells, in order to prevent damage to downhole tools such as packers caused by shifting of a pipe column, a tubing anchor is connected to the tools. However, in order to prevent the tubing anchor from being anchored halfway during the process of going down the well, the conventional tubing anchor locks the starting device by using the pin, and the tubing anchor can be started to anchor the tubing anchor only by pressing the pin into the tubing to cut the pin after going down the well. Therefore, the existing oil pipe anchor needs a pressing device, construction cost and construction time are increased, and construction procedures are increased.

Disclosure of Invention

The utility model aims at designing an oil pipe anchor, making it need not suppress equipment and just can start anchoring mechanism, subtract working costs and engineering time.

The purpose of the utility model is realized like this: the anchor releasing device comprises an inner pipe, a suspension joint, an upper sealing ring, a cone, a lower sealing ring, a slip sleeve and an anchor releasing joint, wherein an oil pipe internal thread is arranged at the upper part of the inner pipe, an oil pipe external thread is arranged at the lower part of the inner pipe, an outer shoulder is arranged outside the inner pipe, a pressure transmitting hole is arranged on the inner pipe and is positioned below the outer shoulder, the upper sealing ring is arranged at the section of the outer shoulder, an inner shoulder is arranged inside the cone, a boss is arranged in the upper part of the cone and is positioned above the inner shoulder, a lower sealing ring is arranged in the lower part of the cone, the cone is sleeved outside the inner pipe, the upper part of the cone is matched with the section of the outer shoulder, a gap between the upper sealing ring and the lower sealing ring is positioned below the pressure transmitting hole, the lower part of the cone is matched with the middle section of the inner pipe, the gap between the lower sealing ring and the lower, the slip sleeve is sleeved outside the cone, the slips are arranged on the cone through the window of the slip sleeve, the inner conical surface of the slips is matched with the outer conical surface of the cone, the dovetail teeth of the slips are inserted into the dovetail groove of the cone, the slips can move radially when the cone descends, the outer thread of the anchor releasing joint 8 is connected with the inner thread of the lower part of the slip sleeve 7, the inner thread of the anchor releasing joint 8 is connected with the straight thread of the lower middle part of the inner pipe 1, the anchor releasing joint is connected with the lower part of the slip sleeve, the upper end face of the anchor releasing joint supports the slips to prevent the slips from separating from the cone, the wax is injected through the pressure transfer hole, and the injected wax is filled in the pressure transfer hole and the annular cavity between the inner pipe and the cone, the upper part of the cone is connected with a suspension joint, the inner diameter of the suspension joint is smaller than the outer diameter of the outer shoulder, and the distance from the lower end face of the suspension joint to the upper end face of the boss is larger than the lower stroke distance of the cone during working.

The utility model has the advantages that: the wax matter that pours into is full of pass and press hole and inner tube and cone between the ring cavity in, make the pressure of inner tube can not spread into the cone in, the cone can not move when going into the well, can not anchor midway, connects after going into the well the utility model discloses an oil pump during operation under, well temperature is higher than the temperature of wax matter, and the wax matter melts, and inner tube pressure is higher than the cone external pressure during the oil pumping, and pressure differential is used in on the inside circular bead of cone, and the cone struts the slips anchoring down on the sleeve pipe. Therefore, the utility model discloses the equipment need not suppress during the anchor, can reduce the operating expenses and engineering time.

Drawings

Fig. 1 is an assembly drawing of the present invention.

Detailed Description

An embodiment of the present invention will be described below with reference to fig. 1.

As shown in figure 1, the embodiment of the utility model comprises an inner tube 1, a suspension joint 2, an upper seal ring 3, a cone 4, a lower seal ring 5, a slip 6, a slip sleeve 7 and an anchor releasing joint 8, wherein the upper part of the inner tube 1 is provided with an oil tube internal thread, the lower part of the inner tube 1 is provided with an oil tube external thread, the outer part of the inner tube 1 is provided with an outer shoulder 1-1, the inner tube 1 is provided with a pressure transmitting hole 1-2, the pressure transmitting hole 1-2 is positioned below the outer shoulder 1-1, the upper seal ring 3 is arranged on the section 1-1 of the outer shoulder, the inner part of the cone 4 is provided with an inner shoulder 4-2, the upper part of the cone 4 is provided with a boss 4-1, the boss 4-1 is positioned above the inner shoulder 4-2, the lower seal ring 5 is arranged in the lower part of the cone 4, the cone 4 is sleeved outside the inner tube 1, and the upper part of, the gap between the upper sealing ring and the lower sealing ring is sealed by the upper sealing ring 3, the lower sealing ring 5 is positioned below the pressure transmission hole 1-2, the lower part of the cone 4 is matched with the middle section of the inner pipe 1, the gap between the lower sealing ring and the lower sealing ring is sealed by the lower sealing ring 5, the boss 4-1 is positioned below the outer shoulder 1-1, the slip sleeve 7 is sleeved outside the cone 4, the slip 6 is arranged on the cone 4 through the window of the slip sleeve 7, the inner conical surface of the slip 6 is matched with the outer conical surface of the cone 4, the dovetail teeth of the slip 6 are inserted into the dovetail groove of the cone 4 (the structure of the slip and the cone is the same as that of a Y221 packer used in an oil well, and the technical personnel in the field know), the slip 6 can move radially when the cone 4 descends, the external thread of the anchor releasing joint 8 is connected with the internal thread at the lower part of the slip sleeve 7, the anchor releasing joint 8 is connected to the lower part of the slip sleeve 7, the upper end surface of the anchor releasing joint 8 supports the slip 6, under the action of the dovetail teeth of the slip 6, the dovetail groove of the cone 4 and the anchor releasing joint 8, the slip 6 can not be separated from the cone 4 (same as a Y221 packer), the wax is injected through the pressure transmission hole 1-2, the injected wax is filled in the annular cavity between the pressure transmission hole 1-2 and the inner pipe 1 and the cone 4, the upper part of the cone 4 is connected with the suspension joint 2, the inner diameter of the suspension joint 2 is smaller than the outer diameter of the outer shoulder 1-1, the distance between the lower end surface of the suspension joint 2 and the upper end surface of the outer shoulder 1-1 is larger than the lower stroke distance of the cone 4 during working, the lower end surface of the suspension joint 2 can not reach the upper end surface of the outer shoulder 1-1 after the slip 6 is anchored on the casing, otherwise the radial amount of the slip 6 flare is insufficient to anchor the casing for the required amount of radial displacement. The boss 4-1 is arranged in the cone 4 to increase the firmness of the hanging cone 4 and prevent the cone 4 from moving in the process of going down the well.

When going into the well, the utility model discloses install on the oil-well pump, go into in the well along with the oil pumping tubular column. When the oil pump works, the well temperature is higher than the temperature of the wax, the wax melts, the pressure in the inner pipe 1 is higher than the pressure outside the cone 4 when the oil pump pumps oil, the pressure difference acts on the inner shoulder 4-2 of the cone 4, and the cone 4 downwards props up the slip 6 and is anchored on the casing pipe. When the pipe column is lifted, the pipe column is lifted and rotated, the anchor releasing joint 8 is supported on the inner wall of the sleeve pipe by the slips 6 and is still, when the pipe column is rotated, the inner pipe 1 rotates, the anchor releasing joint 8 descends under the action of threads, the cone 4 is hung at the outer shoulder 1-1 by the hanging joint 2, when the anchor releasing joint 8 descends relative to the inner pipe 1, the distance between the anchor releasing joint 8 and the cone 4 is increased, the slips 6 can be retracted to release the anchor, and the pipe column can be smoothly lifted.

The number of the slips 6 is 3-6, and the slips are evenly distributed on the slip sleeve 7.

The inner tube 1 can be designed as an assembly, which saves material and processing costs.

The internal thread of the anchor releasing joint 8 is a left-hand thread, and the corresponding straight threads 1-3 at the lower middle part of the inner pipe 1 are also left-hand threads.

The joint of the anchor releasing joint 8 and the slip sleeve 7 needs to be subjected to anti-tripping treatment, so that the anchor is prevented from being tripped at the joint when the anchor is released.

Claims

1. The utility model provides an oil pipe anchor, includes inner tube (1), suspension joint (2), goes up sealing washer (3), cone (4), lower sealing washer (5), slips (6), slip cover (7), break down anchor joint (8), and there is the oil pipe internal thread upper portion of inner tube (1), and there is the oil pipe external screw thread lower part of inner tube (1), characterized by: the outer part of the inner pipe (1) is provided with an outer shoulder (1-1), the inner pipe (1) is provided with a pressure transfer hole (1-2), the pressure transfer hole (1-2) is positioned below the outer shoulder (1-1), the section of the outer shoulder (1-1) is provided with an upper sealing ring (3), the inner part of the cone (4) is provided with an inner shoulder (4-2), the upper part of the cone (4) is provided with a boss (4-1), the boss (4-1) is positioned above the inner shoulder (4-2), the lower part of the cone (4) is internally provided with a lower sealing ring (5), the cone (4) is sleeved outside the inner pipe (1), the upper part of the cone (4) is matched with the section of the outer shoulder (1-1), the upper sealing ring (3) seals a gap between the upper sealing ring and the lower sealing ring (5) is positioned below the pressure transfer hole (1-2), the lower part of the cone (4) is matched with the middle section of the inner tube (1), a gap between the cone (4) and the inner tube is sealed by a lower sealing ring (5), the boss (4-1) is positioned below the outer shoulder (1-1), the slip sleeve (7) is sleeved outside the cone (4), the slip (6) is arranged on the cone (4) through a window of the slip sleeve (7), the inner conical surface of the slip (6) is matched with the outer conical surface of the cone (4), dovetail teeth of the slip (6) are inserted into a dovetail groove of the cone (4), the slip (6) can move radially when the cone (4) descends, the external thread of the anchor releasing joint (8) is connected with the internal thread at the lower part of the slip sleeve (7), the internal thread of the anchor releasing joint (8) is connected with the straight thread (1-3) at the lower middle part of the inner tube (1), the slip (6) is supported by the upper end surface of the anchor releasing joint (8), and the slip (6) can not be separated, and wax substances are injected through the pressure transfer holes (1-2), the injected wax substances are filled in the pressure transfer holes (1-2) and an annular cavity between the inner pipe (1) and the cone (4), the upper part of the cone (4) is connected with the suspension joint (2), the inner diameter of the suspension joint (2) is smaller than the outer diameter of the outer shoulder (1-1), and the distance from the lower end surface of the suspension joint (2) to the upper end surface of the boss (4-1) is larger than the down stroke distance of the cone (4) during working.