Oil Recovery Method for Horizontal Wells
A technology for horizontal wells and horizontal sections, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., which can solve the problems of no mining value, increased construction costs, low economic limit, etc.
Active Publication Date: 2019-10-11
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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[0030] 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.
[0031] Relying on many years of experience and practice in related industries, the inventor proposes an oil production method for horizontal wells to overcome the defect that at least two wells need to be opened in the prior art to complete the injection and production work, and it can be realized through a single well. water flooding of oil reservoirs.
[0032] figure ...
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The invention discloses an oil production method for a horizontal well. The method comprises the following steps of using a horizontal well staged fracturing technology for performing staged fracturing on a reservoir to form N artificial fractures communicated with a horizontal well, wherein the M-th artificial fracture is in adjacent to the (M+1)-th artificial fracture, and the M-th artificial fracture is nearer to a wellhead of the horizontal well than the (M+1)-th artificial fracture; performing setting on the horizontal well between the N-th artificial fracture farthest to the wellhead of the horizontal well and the (N-1)-th artificial fracture; injecting water into the N-th artificial fracture through an oil pipe; performing oil production through a casing pipe; performing unsetting after the oil production is completed; respectively performing setting on the horizontal section of the horizontal well between the M-th artificial fracture and the (M+1)-th artificial fracture, and the horizontal section of the horizontal well between the (M-1)-th artificial fracture and the M-th artificial fracture; and performing oil production through the casing pipe after the water injection into the M-th artificial fracture through the oil pipe. The method has the advantage that the same-well water injection and same-well oil production can be realized through one horizontal well.
Description
technical field [0001] The invention relates to the field of oil extraction, in particular to an oil extraction method for horizontal wells. 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, especially tight reservoirs, are characterized by...
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IPC IPC(8): E21B43/20E21B43/26
Inventor 王少军闫林袁江如冉启全
Owner PETROCHINA CO LTD