A low-cost method for increasing production by reducing crude oil biodegradation and thickening

Abstract

The invention provides a low-cost production increasing method for weakening biodegradation and thickening of crude oil. The low-cost production increasing method for weakening biodegradation and thickening of the crude oil comprises the steps that 1, for a high temperature oil reservoir which is difficult to produce due to excessive thick oil, water flooding cold production development is suspended; 2, steam is injected into the ground, and steam huff and puff development is tried; 3, if the output is increased after steam huff and puff, steam injection development is continued, and if the output is decreased, cheap sewage flooding development is used; 4, sewage is subjected to still standing to reduce the content of oxygen and particulate matter naturally, and after still standing, ultraviolet lamp irradiation is conducted for the first time, so that degradation of the crude oil through water microorganisms is weakened; and 5, the sewage injection rate is controlled, so that water isheated by the oil reservoir, and natural heat sewage flooding development is realized. The low-cost production increasing method for weakening biodegradation and thickening of the crude oil has goodoperability, innovation and practicability and is beneficial to popularization, and a practicable method for preventing thickening of the crude oil due to strongly water washing in the low cost is provided.

Description

technical field

[0001] The invention relates to the technical field of oil field development, in particular to a low-cost production increase method for weakening crude oil biodegradation and thickening. Background technique

[0002] At present, the water flooding development method will cause the thickening of crude oil and the extremely high water content of the produced fluid. Experts in the geochemical industry such as Jin Qiang generally believe that the vast majority of heavy oil is biodegradable oil; in the oil and gas geochemistry textbook compiled by Ren Yongjun, it is pointed out that biodegradation is the main reason for the thickening of crude oil; under experimental conditions, the biodegradation experiment will It takes 8 weeks for thin oil to degrade to bitumen. Water flooding is the most important displacement development method in Shengli Oilfield, but it will cause rapid thickening of crude oil, which is caused by both biochemical and physical reasons. He...

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