Treatment method for abandoned oil and gas wells in coal mining area

Abstract

The invention provides a treatment method for abandoned oil and gas wells in a coal mining area. The treatment method comprises the four steps of well-mouth recovery, well unblocking and sweeping, well logging and three-section plugging. By means of the treatment of the method, safe and economical mining of underground coal resources overlapping oil and gas fields can be guaranteed, the abandoned oil wells in a coal mine well field range can be treated effectively, it is guaranteed that coal mining working surfaces get across the oil and gas wells safely, and environmental pollution accidents caused by oil and gas leakage are avoided.

Description

technical field [0001] The invention relates to the management field of oil and gas wells, in particular to a treatment method for exploited abandoned oil and gas wells before coal mining in the abandoned oil and gas well areas. Background technique [0002] The exploration and development of coal and oil and natural gas in my country are undertaken independently by two mutually independent energy industry systems: the coal system and the oil and natural gas system. Due to the differences in the objective occurrence conditions and regional characteristics of coal and oil and natural gas buried underground, coal seams are generally shallow underground, while oil and gas layers are deep below 1,000 meters underground, and in local areas where coal seams and oil and gas fields overlap , each have a great influence on each other's mining. Usually, in their respective mining planning and design, both parties take isolation measures. The coal mines set up isolated coal pillars wi...

AI Technical Summary

Problems solved by technology

In the coal mine mining design plan, according to the relevant regulations, a large area is reserved for safe coal pillars that cannot be mined, and even the development of some entire coal mines has to be suspended or even not developed due to oilfield mining or its legacy problems, which has caused great harm to resource development. waste

Oil and gas leakage from abandoned oil and gas wells near coal mines, and water in confined water layers entering coal mines along oil and gas wells are one of the direct causes of accidents such as major fires, explosions, toxic and harmful gases, and water damage in coal mines in overlapping areas. The normal design and production of coal mines have brought great inconvenience and potential safety hazards. At the same time, the mining of coal mines will also pose a certain security threat to the oil and gas wells in production.

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