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A method of oilfield water injection that can achieve balanced displacement of remaining oil

A technology for oil field water injection and remaining oil, which is applied in earth-moving drilling, fluid production, wellbore/well components, etc., can solve problems such as poor oil displacement effect and low oil recovery rate, and achieve balanced displacement and enhanced recovery. rate, the effect of improving permeability

Inactive Publication Date: 2016-02-24
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

It is precisely because of the above reasons that existing water flooding development methods have the problems of poor oil displacement and low oil recovery when applied to heterogeneous reservoirs.

Method used

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  • A method of oilfield water injection that can achieve balanced displacement of remaining oil
  • A method of oilfield water injection that can achieve balanced displacement of remaining oil
  • A method of oilfield water injection that can achieve balanced displacement of remaining oil

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specific Embodiment approach

[0028] The present invention will be further explained below in conjunction with the drawings:

[0029] At present, in the field of petroleum exploration and development, there is no method that can adapt to the heterogeneity of the reservoir to adjust the water injection rate. At present, the normal perforation completion method in water injection wellbore is to perform spiral drilling on the wellbore, that is, first perform perforation at a suitable position on the wellbore, and then perform a certain distance above that position. Continue perforating with the phase angle, and then repeat the above construction steps with this perforation point as the new base point, and continue until the required perforation is completed. The spiral well formed in this way has a small number of holes, and the scope of water injection is limited. The plane can only target the remaining oil in one direction, and cannot take into account other directions. Moreover, the hole depth formed by perf...

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Abstract

The invention provides an oilfield water injection method capable of realizing balanced displacement of remaining oil. The oilfield water injection method is mainly used for solving the problems of poor oil displacement efficiency and low petroleum recovery efficiency of the existing water injection development applied to a nonhomogeneous reservoir stratum. The method comprises the steps of forming holes in a shaft uniformly and densly, wherein the hole density in the transverse direction of the shaft is determined according to crustal stress, well network, remaining oil and physical properties, and the distance between two rows of holes in the longitudinal direction of the shaft is determeined according to the physical properties of an oil layer during the hole distribution process; carrying out construction according to the distributed holes, and forming a hole in the side direction; arranging a flow rate-adjustable water nozzle in the formed side hole; carrying out underground butt joint between an underground comprehensive testing and controlling meter in an automatic flow rate testing and controlling system and the flow rate-adjustable water nozzle, and adjusting the opening degree of the water nozzle to realize accurate control of the water injection quantity at each point; and beginning the water injection work. When the oilfield water injection method provided by the invention is used for injecting water, water injection quantities at all points are different according to the nonhomogeneity of each point of a reservoir stratum, and therefore, balanced displacement of remaining oil is realized, the water absorption profile of a water well is improved and the oilfield recovery efficiency is improved.

Description

Technical field: [0001] The invention relates to an oilfield water injection and oil displacement method used in the field of oilfield petroleum exploration and development for improving oilfield recovery. Background technique: [0002] Due to the heterogeneity of different layers and different scales in the reservoir, the permeability at each point is not completely the same. There are obvious differences in the interlayer and intralayer seepage characteristics of most of the oil fields in my country. , The injected water flows along the high-porosity, high-permeability zone, large pore throat or fracture, so that the oil and gas in the matrix, low-porosity, and low-permeability zone are produced to a low degree, or even not produced. In addition, the oilfield flooding is serious and uneven, the nature of the injected water changes complex, and the underground fluid properties and stratum structure changes after the oilfield floods. The changes in the physical properties of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/20E21B43/114E21B29/06
Inventor 张继成何晓茹位建成李琦王潇悦王鸿博
Owner NORTHEAST GASOLINEEUM UNIV
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