A method for transforming abandoned oilfield wells into geothermal wells or brine wells

Abstract

The invention discloses a method for transforming an oil field abandoned well into a geothermal well or a brine well. The method comprises the steps that in an oil field exploitation area, an oil field abandoned well with a brine layer below an oil extraction layer or an oil field abandoned well with the bottom boundary of a geothermal reservoir layer 200 m above an oil extraction layer position is selected, a drill pipe drill rig is lowered into an oil layer casing pipe to carry out pigging, and when pigging is smoothly achieved and after it is determined that no abnormal condition exits in the well, the artificial bottom of the well is poured to seal the lower portion oil extraction layer position; a pump chamber section is transformed, and a water drainage pipe is additionally arranged on an exploitation layer; perforation construction is carried out on a technical casing pipe located on the exploited geothermal reservoir layer or the brine layer; a water filtering pipe is lowered into the exploitation layer, and for the transformed geothermal well or the brine well, sand washing well washing is directly carried out, or a water filtering pipe with a sediment pipe on the lower portion is lowered; after well washing, exploitation testing, sampling analysis and acceptance check are carried out. By means of the method, the oil field abandoned well resources are recycled, and the double effects of energy conservation and environment protection, and economic benefits of recycling of the oil field abandoned well resources are achieved.

Description

technical field [0001] The invention relates to the technical field of oil fields, in particular to a method for transforming abandoned wells in oil fields into geothermal wells or brine wells. Background technique [0002] In the field of oil fields, due to the increasing oil production, the oil output of many oil wells has decreased year by year, and the number of abandoned oil wells has increased year by year. Taking Shengli Oilfield as an example, more than 10,000 oil wells have been abandoned. In order to prevent the destruction of the geological environment and the pollution of groundwater, the oilfield expends a lot of manpower, material resources and financial resources to close the wells and abandon them in the wilderness. On the other hand, in order to find new oil and gas resources, a large number of exploration wells are discarded every year. At present, most of them are abandoned and treated as abandoned wells. [0003] In recent years, energy saving, emission ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for transforming abandoned wells in oil fields into geothermal wells or brine wells, to solve the problem that a large number of oil and gas wells abandoned in oil fields cannot be reused scientifically and rationally, to achieve the reuse of resources in oil field abandoned wells, and to realize the recycling of oil field abandoned well resources. Double harvest of energy saving, environmental protection and economic benefits

Images