Down-hole oil production screw pump fixer

Abstract

This invention is under-well oil extraction screw pump fixer. When sucker rod is rotating, the screw pump stator drives fluke seat and fluke to rotate synchronously. Under the effect of cam device on the internal pipe, the fluke undertakes outward radial motion, which makes fluke clamp on inner wall of sleeve. The fluke seat and fluke can not rotate on the inner wall of sleeve. Thus, the screw pump stator can not move, while the rotor rotates continually, which pumps crude oil to ground. When rotating oil string, under the effect of cam device on the internal pipe, the fluke undertakes inward radial motion, which makes fluke separate from inner wall of sleeve. Thus, the anchoring is relieved. The problems of oil pipe releasing and dropping to well do not happened when rotating oil string. This invention rotates anchorage by the working characters of screw pump.

Description

1. Technical field [0001] The invention relates to a tool for an oil production well of an underground screw pump in an oil field, in particular to a holder for an underground screw pump for oil production. It is a mechanical product. 2. Background technology [0002] When pumping oil with a screw pump, the surface driving device drives the sucker rod to rotate, and the sucker rod drives the rotor of the screw pump to rotate. Since the screw thread of the oil pipe and the screw thread of the sucker rod driving the screw pump rotor rotate in the same direction, during oil pumping , the sucker rod drives the screw pump rotor to rotate, and the frictional moment between the screw pump rotor and the stator becomes the torque of the tubing breakout. This torque is likely to cause the tubing thread to break out and cause the tubing to fall into the well, resulting in major economic losses. In order to avoid such accidents, the method of anchoring the tubing is often used to avoid...

AI Technical Summary

Problems solved by technology

[0002] When pumping oil with a screw pump, the surface driving device drives the sucker rod to rotate, and the sucker rod drives the rotor of the screw pump to rotate. Since the screw thread of the oil pipe and the screw thread of the sucker rod driving the screw pump rotor rotate in the same direction, during oil pumping , the sucker rod drives the screw pump rotor to rotate, and the frictional moment between the screw pump rotor and the stator becomes the torque of the tubing shackle. This torque is easy to cause the tubing thread to be shackled and the tubing to fall into the well, resulting in major economic losses.

In order to avoid such accidents, the method of anchoring the tubing is often used to avoid the accident of the tubing thread shackle falling into the well. The existing anchoring device is improved by the packer assembly, and the anchoring is realized by the weight of the tubing string , can only bear the axial force, while the screw pump tubing string not only bears the axial force, but also bears the torque, so using the packer assembly as the anchor device requires a large axial anchoring force, causing the tubing to bend, Aggravate the wear and tear of oil pipes and sucker rods, and it is not very reliable, and there have been accidents where the anchored oil pipes were not firmly anchored and fell into the well

Images