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

A biodegradable, low-cost technology, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problem of inability to develop remaining oil, etc., and achieve the effect of facilitating promotion, good operability, and clear technical thinking

Active Publication Date: 2020-03-20
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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Problems solved by technology

Water flooding conversion to thermal recovery sometimes fails, making low-efficiency wells into invalid wells, that is, the remaining oil cannot be developed regardless of water flooding cold recovery or steam injection thermal recovery

Method used

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

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Embodiment Construction

[0014] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0015] Such as figure 1 as shown, figure 1 It is a flow chart of a specific embodiment of the low-cost production increase method for weakening crude oil biodegradation and thickening of the present invention.

[0016] In step 101, for oil reservoirs whose underground temperature is between 50°C and 80°C and are difficult to recover due to too thick oil, the development of water flooding and cold recovery is suspended. In areas where water flooding development is suspended, because water flooding biodegradation causes crude oil thickening and viscosity increase, leading to the formation of dominant channels for heavy oil bitumen, oil areas with high water content and extremely high water content in the produced fluid.

[0017] In step 102, stea...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/20
CPCE21B43/20E21B43/24
Inventor 吴兆徽吴光焕李伟忠牛丽娟韦涛刘西雷崔卫东吴颖昊赵衍彬陈明铭宿文浩梁金萍路言秋孙钰马健杨鹏李珊珊李伟
Owner CHINA PETROLEUM & CHEM CORP
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