Well completion pipe string and production pipe string of electric pump producing well and construction method thereof

Abstract

The invention relates to a well completion pipe string and a production pipe string of an electric pump producing well and a construction method thereof. The well completion pipe string comprises a left-in-well packer and a well completion oil pipe, wherein the lower portion of the left-in-well packer is further connected with a pipe insertion sliding sleeve, the pipe insertion sliding sleeve is provided with a closing sleeve, a positioning sleeve, an upper connecting sleeve and a lower connecting sleeve, a liquid flow hole or groove is formed in a pipe body of the closing sleeve, and a positioning rib is arranged on the pipe body of the positioning sleeve. The production pipe string comprises an electric pump conversion hanger and an electric pump unit, wherein an electric pump unit outer sheath is further mounted outside the electric pump conversion hanger and the electric pump unit, the lower end of the electric pump unit outer sheath is further connected with a sliding sleeve opening and closing tool through a production oil pipe, a switch head of the sliding sleeve opening and closing tool can be inserted into the closing sleeve of the insertion pipe sliding sleeve, and the closing sleeve and the upper connecting sleeve can communicate or be closed. By lowering and lifting the production pipe string, the sliding sleeve opening and closing tool located at the lower end can open and close the upper connecting sleeve in the pipe inserting sliding sleeve, and the lowering times of the pipe column are greatly reduced.

Description

technical field [0001] The invention relates to a completion pipe string and a production pipe string of an electric submersible pump oil production well in the petroleum industry, in particular to a completion pipe string, a production pipe string of an electric pump oil production well and a construction method thereof. Background technique [0002] Due to the limitations of the current submersible electric pump technology, domestic electric pump units are routinely lowered to a shallower depth, generally within 3000m. Since the depth of offshore mid-deep oil reservoirs is mostly 3800-4500m, well washing and well killing operations are being carried out. Usually, the killing fluid circulation inlet can only circulate from the suction port of the electric pump separator of the electric pump unit, so it is impossible to completely circulate the oil and gas from the bottom of the production string to the top of the reservoir, making rapid well killing difficult. [0003] At t...

AI Technical Summary

Problems solved by technology

[0011] The deficiencies and defects of the above operation process are: 1. Before the anti-leakage valve is put in place, a large amount of formation fluid is lost after formation acid fracturing, which affects the real production capacity; 3. Affected by the depth of the suction inlet of the electric pump unit, the well cannot be flushed to the upper part of the well-stayed packer, and the gas cannot be effectively degassed; 4. The anti-leakage valve in the completion string cannot prevent the formation liquid from upwelling, further Increased well control risk

The above problems have greatly increased the operation and production costs, and urgently need to be improved

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