Tubing anchor

Abstract

The invention belongs to the field of oil field oil extraction equipment and particularly relates to a tubing anchor. The tubing anchor comprises a tubing anchor body and also comprises a pressure-limiting tripping mechanism, wherein the pressure-limiting tripping mechanism structurally comprises a sliding pipe, a conical sleeve, a one-way stop sleeve, a disc spring, an outer cylinder, a plug anda lower joint, the outer side of the sliding pipe is provided with a sliding way and a rack, the rack is provided with one-way stop teeth, the disc spring and the one-way stop sleeve are arranged in an annular space between the sliding pipe and the outer cylinder, the upper end and the lower end of the disc spring respectively abut against the outer cylinder and the one-way stop sleeve, the one-way stop sleeve is kept moving away from the conical sleeve under the effect of the disc spring, and the upper end of the one-way stop sleeve is provided with a spring claw. When thermal recovery is stopped, a tubing column is shortened, an axial pull force borne by a tubing and the tubing anchor body is limited in a certain range, so that the pull force produced after tubing column condensation does not affect the set-packing stability of the tubing anchor body and also does not cause challenge of the tensile strength of oil pipes.

Description

technical field [0001] The invention belongs to the field of oil production equipment in oil fields, in particular to an oil pipe anchor. Background technique [0002] In the process of oil exploitation, the tubing anchor is an essential tool, its function is to fix the tubing string on the well wall and prevent the tubing string from rotating. At present, after most tubing anchors are anchored, the tubing string not only cannot rotate, but also cannot move up and down. However, in the thermal recovery of heavy oil, this kind of tubing anchor will cause some problems: during thermal recovery, the tubing string is stretched by heat. long, but the tubing anchor cannot move, which directly leads to the bending of the tubing string under pressure, which in turn leads to large mechanical losses of the oil production lifting device, low efficiency of the unit, and rapid wear of the sucker rod and tubing. [0003] In order to solve the above problems, a one-way slip tubing anchor ...

AI Technical Summary

Problems solved by technology

At present, after most tubing anchors are anchored, the tubing string not only cannot rotate, but also cannot move up and down. However, in the thermal recovery of heavy oil, this kind of tubing anchor will cause some problems: during thermal recovery, the tubing string is stretched by heat. long, but the tubing anchor cannot move, which directly causes the tubing string to bend under pressure, which in turn leads to large mechanical losses of the oil production lifting device, low efficiency of the unit, and rapid wear of the sucker rod and tubing, etc.

However, when thermal production stops, the tubing string will shrink and become shorter, and the tubing anchor cannot move upwards at this time, which directly causes the tubing string to bear a large tensile stress. The existence of this tensile stress directly causes the tubing to The anchor is easy to unseal, and the requirements for the anchoring force of the oil pipe anchor are high and the tensile strength of the oil pipe is high.

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