A double-tube thermal recovery wellhead device and its application method

Abstract

The invention relates to the field of petroleum exploitation, and specifically discloses a double-pipe thermal recovery wellhead device and its use method, including wellhead joints, oblique six-way joints, first four-way joints, main gate valves, different-diameter joints and second four-way joints Joint, the outer peripheral side of the oil pipe connector is slidingly connected with the inner wall of the communication pipe on the upper part of the oblique six-way joint and the inner wall of the communication pipe on the upper part of the first four-way joint. Sleeve, first mounting cap, extruding block, extruding column, first spacer, second spacer and sealing rubber ring, wellhead joint includes second mounting cap, push pin, mounting cylinder, fine Oil pressure pipes, sealing plates, thick oil pressure grooves, limit collars, connecting extrusion plates, friction plates and different-diameter casings can realize three different oil production methods through one wellhead device, and at the same time can save different methods in The time during the experiment ensures the safety of the staff and the safety and reliability of oil production.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a double-pipe thermal recovery wellhead device and a method for using the same. Background technique [0002] In the past, the steam thermal recovery of heavy oil horizontal wells usually adopts the single-pipe suspension process in the same well. During production, only intermittent steam injection or oil production is required. The operation is cumbersome, the cost is high, and environmental protection is prominent. The flow phenomenon also seriously affects the development effect of horizontal wells. However, the wellhead technology used in domestic oilfields currently lacks a horizontal well wellhead device that can specifically solve the cumbersome single-pipe huff and puff operation and overflow problems. [0003] The double-pipe thermal recovery wellhead device is an important device for heavy oil production. It is mainly composed of three parts: the tubing head, the ...

AI Technical Summary

Problems solved by technology

[0002] In the past, the steam thermal recovery of heavy oil horizontal wells usually adopts the single-pipe suspension process in the same well. During production, only intermittent steam injection or oil production is required. The operation is cumbersome, the cost is high, and environmental protection is prominent. The flow phenomenon also seriously affects the development effect of horizontal wells, but the wellhead technology used in the field of domestic oilfields still lacks a horizontal well wellhead device specially designed to solve the cumbersome single-pipe huff and puff operation and overflow problems

[0003] The double-pipe thermal recovery wellhead device is an important device for heavy oil production. It is mainly composed of three parts: the tubing head, the casing head and the Christmas tree. Among them, the double-pipe cross is an important part of the Christmas tree. , the heavy oil will pass through the Christmas tree part of the double-tube thermal recovery wellhead device. At this time, the double-tube spool is the main pressure-bearing part of the entire tree, so the double-tube spool is most susceptible to fatigue damage. In actual use, The maintenance and replacement frequency of the double-pipe four-way is extremely high, which greatly increases the cost of oil production

Images