A low-temperature oxidation rate prediction and safety precaution method for crude oil in light oil reservoirs
A light oil reservoir, oxidation rate technology, applied in the direction of earthwork drilling, wellbore/well components, etc., can solve the problems of associated gas explosion, long time, high cost, etc., to prevent gas channeling, ensure retention time, and reduce safety The effect of preventive measures on cost
Active Publication Date: 2017-10-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0004] Different from other gases, the whole process of air injection has the risk of explosion between the associated gas (natural gas) in crude oil and air, so the safety of air injection has always been the focus of attention and the most worrying issue.
It takes a long time to conduct low-temperature oxidation experiments in indoor laboratories, with heavy workload and high cost, and not every reservoir has the conditions for indoor experiments, which affects and limits the field application of air injection and air foam flooding, which is not conducive to large-scale Scale promotion
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[0071] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0072] In the air flooding technology in the oil field, the most worrying thing is the safety issue, that is, the explosion of natural gas in the air. For example, there have been explosions in the process of air lift oil recovery, and liquefied gas explosions are also common in daily life, so I am very worried. Air safety concerns. Most people only see the explosion of natural gas in the air, but they don’t know that oxygen in the air can undergo low-temperature oxidation with crude oil (natural gas). In fact, all organic matter can undergo low-temperature oxidation, such as spontaneous combustion in coal fields, aging of plastics, etc. This is due to the low-temperature oxidation reaction.
[0073] After knowing that crude oil can also undergo low-temperature oxidation, a certain oilfield needs to carry out air injection flooding. When conducting safety demonstrati...
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The invention provides a low-temperature oxidation rate prediction and safety prevention method for light oil reservoir crude oil, belonging to the field of petroleum exploitation engineering. The method of the present invention comprises the following steps: the first step: measuring the relative density of crude oil; the second step: determining whether it is a light oil reservoir, and if so, turning to the third step; the third step, actually measuring the formation temperature of a single well in the oil reservoir; The fourth step is to determine the reservoir temperature; the fifth step is to use the following formula to calculate the reaction time to reach the safe oxygen value, which realizes the oxidation rate prediction: y=1.336×10‑5e4732.6 / T where y is the safe oxygen value to be reached Reaction time, the unit is day, T is the reservoir temperature determined in the fourth step, the unit is K, e is a constant in the natural logarithm in mathematics; the sixth step is to determine the residence time of the injected fluid in the ground; the seventh step is to compare The residence time of the injected fluid in the ground and the reaction time to reach the safe oxygen value.
Description
technical field [0001] The invention belongs to the field of petroleum exploitation engineering, and in particular relates to a low-temperature oxidation rate prediction and safety precaution method for crude oil in light oil reservoirs, which is suitable for air injection and air-foam supplementation of reservoir formation energy and enhanced recovery. Background technique [0002] Air injection and air foam are new technologies for enhanced oil recovery in light oil reservoirs. Air foam is mainly used for dewatering and oil stabilization and enhanced oil recovery in the "three high" oilfields in the later stage of development; air injection is mainly used for water injection to supplement energy. Large-scale gas injection in low-permeability and ultra-low-permeability reservoirs and water-deficient areas such as oilfields in Northwest China to supplement formation energy development is of great significance for improving oilfield production and recovery. [0003] Due to th...
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IPC IPC(8): E21B49/00
Inventor 翁高富罗超光冯勋伟刘新华张佐栅李益在梁德成
Owner CHINA PETROLEUM & CHEM CORP