Oilfield reinjection water comprehensive treatment system

Abstract

An oilfield reinjection water comprehensive treatment system comprises a sterilizing part, a deoiling part and a filtering part. The sterilizing part mainly comprises a radioactive source, a stainless steel sealing device, a well mouth sealing device and the like. An irradiation sterilization technology is adopted for the sterilizing part for the first time and can kill or even eliminate sulfate reducing bacteria, saprophytic bacteria, iron rust bacteria and other bacteria with certain drug resistance and difficult to kill mainly existing in oilfield sewage by adjusting the irradiation dosage according to site demands. The deoiling part mainly comprises a sewage recovery pool, a radar liquid level meter on the top of a deoiling tank, a coarse graining device in the deoiling tank, a honeycomb-like inclined tube, a coagulant inlet and the like. The filtering part mainly comprises a pressure filtering tank. The deoiling procedure is simplified, irradiation sterilization is applied in the oilfield reinjection water treatment process for the first time, the whole sterilization process is completed in an abandoned oil well and is more reliable and safer, and the problems that in traditional sewage treatment, sterilization is not thorough and drug resistance is easily generated are thoroughly solved.

Description

technical field [0001] The invention belongs to the technical field of oilfield reinjection water treatment, in particular to a comprehensive treatment system for oilfield reinjection water. Background technique [0002] At present, my country's oilfields use water injection to the oil layer to maintain the pressure of the oil layer to increase the oil recovery rate. Most of the water injected into the oil layer comes from the sewage released during the extraction of crude oil. The untreated sewage contains a large amount of suspended solids, emulsified oil, Harmful substances such as bacteria, if untreated or unqualified sewage is injected into the oil layer, it will cause a large number of bacteria to multiply, mechanical impurities, and iron deposits to block the oil layer, causing the water injection pressure to rise and affecting the oil recovery efficiency. It will also cause environmental pollution. The traditional reinjection water treatment process is cumbersome and ...

AI Technical Summary

Problems solved by technology

[0002] At present, my country's oilfields use water injection to the oil layer to maintain the pressure of the oil layer to increase the oil recovery rate. Most of the water injected into the oil layer comes from the sewage released during the extraction of crude oil. The untreated sewage contains a large amount of suspended solids, emulsified oil, Harmful substances such as bacteria, if untreated or unqualified sewage is injected into the oil layer, it will cause a large number of bacteria to multiply, mechanical impurities, and iron deposits to block the oil layer, causing the water injection pressure to rise and affecting the oil recovery efficiency. also cause environmental pollution

The traditional reinjection water treatment process is cumbersome and the treatment effect cannot be guaranteed. In particular, the sterilization treatment of reinjection water mainly achieves the purpose of sterilization by adding one or more than two bactericides. This method has the disadvantages of incomplete sterilization, prone to problems such as drug resistance

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