Process method and device for layer-sealing channeling-sealing of high temperature and high pressure leaking well

Abstract

The invention provides a process method and device for layer-sealing channeling-sealing of a high temperature and high pressure leaking well. The process method for layer-sealing channeling-sealing ofthe high temperature and high pressure leaking well comprises the steps that the high temperature and high pressure leaking well is filled with quartz sand, and a new shaft bottom is formed at the upper boundary of the quartz sand; first cooling liquid is injected into the high temperature and high pressure leaking well; a ground pipeline is connected, and an oil pipe and a casing pipe are subjected to pressure tests through the ground pipeline; when the temperature of the newly formed shaft bottom falls to a first preset temperature, the oil pipe and the casing pipe are subjected to the pressure tests to predetermined pressure values while no puncture occurs, and a high temperature pre-sealing agent is injected into the high temperature and high pressure leaking well through the oil pipe; second cooling liquid is injected into the high temperature and high pressure leaking well; and when the temperature of the newly formed shaft bottom falls to a second preset temperature and the high temperature pre-sealing agent is initially set, a high temperature sealing agent is injected into the high temperature and high pressure leaking well. The process method and device for layer-sealingchanneling-sealing of the high temperature and high pressure leaking well can meet the process requirements for layer-sealing channeling-sealing of high temperature and high pressure leakage wells.

Description

technical field [0001] The invention relates to the technical field of leakage well disposal technology, in particular to a process method and device for sealing layer and channeling of high-temperature and high-pressure leakage wells. Background technique [0002] The statements in this section only provide background information related to the present disclosure and may not constitute prior art. [0003] In the middle and late stages of heavy oil production using steam stimulation and steam flooding technology, due to multiple rounds of steam stimulation and long-term steam flooding, formation steam may form fingering and gas channeling between formations. In addition, the casing of the oil well may be damaged due to long-term operation and leakage occurs. Or, the cement sheath outside the casing fails due to long-term high-temperature and high-pressure erosion, resulting in channeling outside the casing. The above is the situation of high temperature and high pressure l...

AI Technical Summary

Problems solved by technology

Therefore, the conventional seal channel sealing process cannot meet the technical requirements of high temperature and high pressure leakage wells for seal channel channel sealing.

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