Oil extraction method for ultra-low permeable reservoir or dense reservoir
A technology for tight oil reservoirs and penetrating oil, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., and can solve problems such as no production value, increased construction costs, low economic limit, etc.
Inactive Publication Date: 2016-03-23
PETROCHINA CO LTD
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Problems solved by technology
However, it is still an injection-production relationship between two wells. When the controlled reserves in the area are low, setting up one more well will increase the construction cost, and make the controlled reserves of a single well correspondingly lower, below the economic limit. So the area has no mining value
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[0031] The details of the present invention can be understood more clearly with reference to the accompanying drawings and the description of specific embodiments of the present invention. However, the specific embodiments of the present invention described here are only for the purpose of explaining the present invention, and should not be construed as limiting the present invention in any way. Under the teaching of the present invention, the skilled person can conceive any possible modification based on the present invention, and these should be regarded as belonging to the scope of the present invention.
[0032] With years of experience and practice in related industries, the inventor proposes an oil recovery method for ultra-low permeability reservoirs or tight reservoirs to overcome the defect in the prior art that at least two wells need to be opened to complete the injection and production work. A single well realizes the water flooding of the oil reservoir.
[0033] ...
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The invention discloses an oil extraction method for ultra-low permeable reservoir or dense reservoir. The method is characterized by comprising the following steps: after cased hole completion of a horizontal well, using a horizontal well staged fracturing technology to fracture a reservoir stratum in a staged manner, to form N artificial fractures communicated with the horizontal well, wherein the Mth artificial fracture is adjacent to the (M+1)th artificial fracture, N being an integer larger than or equal to 3, M=1, 2, 3, 4, and the like, (N-1); the Mth artificial fracture being closer to the mouth of the horizontal well than the (M+1)th artificial fracture; using a tubular column with a packer which is connected with an oil tube to seal the horizontal section of the horizontal well between the first artificial fracture and the second artificial fracture, injecting water into the first artificial fracture through a casing pipe, and extracting oil through an oil tube, and unsealing after oil extraction is completed; sealing the horizontal well between the Mth artificial fracture and the adjacent (M+1)th artificial fracture, and injecting water to the Mth artificial fracture through the casing pipe, and using the oil tube to extract oil. The method can realize injection in the same well and oil extraction from the same well through the horizontal well.
Description
technical field [0001] The invention relates to the field of petroleum exploitation, in particular to an oil recovery method for ultra-low permeability oil reservoirs or tight oil reservoirs. Background technique [0002] Ultra-low permeability oil reservoirs and tight oil reservoirs are widely distributed in Changqing Oilfield, Xinjiang Oilfield, Daqing Oilfield, Jilin Oilfield, Dagang Oilfield and other major oilfields in China. The reserves are huge, 2.5 times that of conventional oil reservoirs, and the development prospects are broad. At present, my country's Changqing Oilfield has carried out pilot development tests in ultra-low permeability reservoirs, and the established production capacity has reached 3 million tons per year and is increasing year by year. Xinjiang Oilfield, Daqing Oilfield and Jilin Oilfield have done a lot of work in the exploration and development of tight oil reservoirs and made some progress. [0003] However, ultra-low permeability reservoirs...
Claims
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IPC IPC(8): E21B43/12E21B43/20E21B43/26
CPCE21B43/20E21B43/121E21B43/26
Inventor 王少军冉启全陈福利房平亮
Owner PETROCHINA CO LTD