Pipe string structure and process method for integration of injection and production of heat-insulated canned electric submersible pump

Abstract

A pipe string structure and process method for the integration of injection and production of heat-insulated canned electric submersible pumps. The following steps are adopted: 1: lowering the process pipe string into the production casing; Pressurize to establish the main channel for steam injection; (2) Close the sealing device to prevent steam from entering the heat-insulating diversion device from the annulus in the heat-insulated oil pipe and production casing; (3) Synchronously inject nitrogen into the annulus for heat insulation; (4) Inject into the heat-insulated oil pipe High-temperature steam; the third step: ①After the steam injection and braising are completed, the fluid is transported from the insulated oil pipe channel to the wellhead; ②When the oil pressure is released to 0, then the casing pressure is released to 0; 4: 1 ) When the production cycle is changed, cut off the steam injection channel below the pipe string joint; 2) Establish the production channel of the submersible motor electric pump system, and lift the high-temperature fluid at the bottom of the well to the wellhead, so as to realize the normal production state of the electric pump. The invention not only improves the thermal energy utilization rate of the heavy oil well, but also improves the steam huff and puff development capability of the heavy oil well on the offshore platform at 350°C.

Description

technical field [0001] The invention belongs to the technical field of thermal recovery technology for heavy oil development, and in particular relates to a pipe string structure and a process method for integrating injection and production of a heat-insulated canned submersible electric pump. Background technique [0002] At present, my country's offshore reserves are rich in heavy oil resources, and more than 60% of its proven reserves are heavy oil reserves. After more than ten years of continuous exploration and testing, for the development of heavy oil thermal recovery on offshore platforms, a pilot test area for multi-component thermal fluid stimulation and steam stimulation has been established. Due to the high content of non-condensable gas in the multi-component thermal fluid stimulation technology, it is difficult to control gas channeling between wells after multiple rounds of stimulation; therefore, there are technical limitations in the large-scale application o...

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Problems solved by technology

[0014] The purpose of the present invention is to provide a heat-insulated canned submersible electric pump injection-production integrated pipe string structure and process method to solve the problem of improving the thermal energy utilization rate of heavy oil wells and steam injection suitable for 350°C steam huff and puff development of heavy oil wells on offshore platforms technical issues

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