Offshore thermal recovery electric submersible pump injection and production integrated pipe column and operation method

Abstract

The invention discloses an offshore thermal recovery electric submersible pump injection and production integrated pipe column and an operation method. The integrated pipe column comprises a first aerogel heat insulation oil pipe, a deep well safety valve, a thermal recovery packer, a second aerogel heat insulation oil pipe, a common oil pipe and a guide shoe that are successively connected from top to bottom. The integrated pipe column further comprises an electric submersible pump system; and the electric submersible pump system is detachably arranged in the first aerogel heat insulation oil pipe, and comprises a continuous oil pipe, a hydraulic / electric double-channel short section, a pump, a motor and a bottom plug that are successively connected from top to bottom. The integrated pipe column further comprises a high-temperature optical fiber, a first hydraulic control pipeline, a second hydraulic control pipeline, a small flat cable and a large flat cable. The first hydraulic control pipeline is used for controlling a deflation valve. When steam needs to be injected into the ground layer, the electric submersible pump system is pulled out through the continuous oil pipe, so that high-temperature steam injection can be achieved; when electric pump production is needed after steam injection is finished, the electric submersible pump system is put down through the continuous oil pipe, so that free switching between injection and production can be achieved through pulling down of the continuous pipe cable, and convenience and rapidness are achieved.

Description

technical field [0001] The invention relates to an offshore heavy oil thermal recovery development and oil recovery process, in particular to an offshore thermal recovery electric submersible pump injection-production integrated pipe string and an operation method. Background technique [0002] Heavy oil steam huff and puff thermal recovery refers to a heavy oil well that injects a certain amount of steam continuously in a short period of time, and then simmers the well for 5-7 days to diffuse the heat of the steam to the reservoir, and then starts the pump to start the well production. After the underflow temperature drops to a certain level, it enters the next round of steam injection, well soaking, and oil production. This is repeated for multiple rounds of cycles. The size of the steam heat utilization rate determines the quality of thermal recovery and development. [0003] The usable area of ​​offshore oilfields is small, and the temperature and pressure of steam huff ...

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Problems solved by technology

[0003] The usable area of ​​offshore oilfields is small, and the temperature and pressure of steam huff and puff thermal recovery are high. At present, there is no injection-production integration mode that is fully suitable for the development of heavy oil steam huff and puff on offshore platforms at home and abroad. Offshore thermal recovery generally adopts heat injection strings and production strings The separated operation mode, that is, replace the heat injection string during the workover operation on the platform before the steam injection in the heavy oil well, and replace the production string after the workover operation after the blowout of the brine well. This mode has disadvantages: ①The workover operation is cold The heat energy of the steam near the wellbore is consumed by the cold fluid, the heat utilization rate is reduced, and the thermal recovery development effect is affected; ②Drilling and workover rig operation resources are occupied for a long time, which affects the production of heavy oil well reserves on the platform;③ The cost of offshore workover operations is high, and back and forth operations increase the cost of offshore heavy oil development; ④ Long-term tripping and lowering of the string also affects the integrity of the casing of heavy oil wells on the platform, bringing safety development risks

On land, the "pumping unit + heat-insulated tubing + wear-resistant sucker rod + thickening pump" injection-production integrated string method is often used, but the offshore space is limited, and it is impossible to place a huge kowtow machine, and the corrosion of the rod and tube is partial. Grinding issues also present safety risks

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