Closed-loop well washing method based on coiled tubing and telescopic robot

Abstract

The invention discloses a closed-loop well washing method based on a coiled tubing and a telescopic robot. The closed-loop well washing method comprises the following steps that the two ends of the coiled tubing are connected with a coiled tubing operation machine and a downhole tool respectively, and the downhole tool comprises the telescopic robot and a well washing tool which are connected; the coiled tubing operation machine is started, and the coiled tubing is lowered; a well washing medium is pumped into the coiled tubing at high pressure, mechanical-electric-hydraulic three-phase coupling is carried out with the telescopic robot, traction force is generated, and the coiled tubing reaches a well bottom working section in combination with ground power; meanwhile, the well washing medium continues to flow along the coiled tubing and is injected out of the downhole tool, and sand washing and well washing are conducted on the well bottom working section; the medium after well washing flows back to the ground along with an annulus between a well wall and the coiled tubing; and the closed-loop well washing operation is completed by continuously pumping the well washing medium and repeatedly washing the well. The closed-loop well washing method can solve the problems of deflection section oil pipe buckling and horizontal section blocking during horizontal well washing through the coiled tubing, the tool is lowered in place, and the operation efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir exploitation, in particular to a closed-loop well flushing method based on a coiled tubing and a telescopic robot. Background technique [0002] In the process of oil and gas production, well flushing can carry the material in the wellbore to the surface, thereby changing the properties of the medium in the wellbore to meet the operating requirements, which is beneficial to the production of clean oil and gas. When flushing wells, the prior art often uses drill pipes or coiled tubing to connect downhole tools, and the drill pipes or coiled tubing and downhole tools are lowered through the surface power device, and the original drilling pump is used to pump the well flushing medium to perform circular flushing. [0003] However, no matter whether it is drilling pipe running or coiled tubing running, the power provided by the ground is currently used. In addition, using the drill pipe...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention aims to provide a closed-loop well cleaning method based on coiled tubing and a telescopic robot. The telescopic robot provides traction and solves the problems caused by buckling of the deflection section of the existing coiled tubing flushing horizontal well and insufficient power at the working end. Inadequate running of downhole tools and time-consuming, labor-intensive and high-cost drilling pipe washing

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