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Method for evaluating watered-out degree of ultralow-permeability water-drive reservoir sandstone oil layer

A technology for penetrating water and oil layers, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., and can solve the problems of many discrimination factors and inaccurate judgment

Active Publication Date: 2011-01-12
PETROCHINA CO LTD
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Problems solved by technology

[0005] In order to solve the problems that the existing method for judging the degree of water washout of an oil layer relies on many discriminant factors and inaccurate judgment, the present invention provides a method for evaluating the degree of water washout of a sandstone oil layer in an ultra-low permeability water drive reservoir, the method comprising:

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  • Method for evaluating watered-out degree of ultralow-permeability water-drive reservoir sandstone oil layer
  • Method for evaluating watered-out degree of ultralow-permeability water-drive reservoir sandstone oil layer

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Embodiment Construction

[0022] In order to deeply understand the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The invention can provide a method for evaluating the sandstone oil layer of an ultra-low permeability water flooding reservoir for improving the water flooding effect and further increasing the water flooding recovery rate of the oil reservoir after the ultra-low permeability water flooding development oil reservoir enters the medium-high water-cut development period of the oil field. The method of washing degree. This method is especially suitable for reservoirs with a permeability of 10 -3 ~10 -2 um 2 , the reservoir temperature is not higher than 70°C, the salinity of formation water is lower than 100000mg / L, the concentration of calcium and magnesium ions is lower than 10000mg / L, and the viscosity of formation crude oil is lower than 5mPa.s.

[0024] see figure 1 , the embod...

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Abstract

The invention discloses a method for evaluating the watered-out degree of an ultralow-permeability water-drive reservoir sandstone oil layer, which belongs to the technical field of oil-field development. The method comprises the following steps: analyzing the core sample of the sandstone oil layer, and determining the position, composition and content of secondary minerals in the sandstone oil layer; according to the conditions of the stratum, mixing the output water and injected water in the oil layer with the original output water and injected water of the oil layer, and determining the mixing ratio of oil layer water, which produces secondary minerals with oil layer composition and content, to injected water; and establishing a relation sectional drawing among porosity, permeability, oil saturation, watered-out degree and secondary mineral content of the sandstone oil layer, and determining the watered-out degree of the oil layer injected water. The evaluation analysis result provided by the invention can reflect the actual watered-out degree of the analyzed oil layer, prevents one oil layer from producing multiple watered-out degrees, and lays a firm foundation for determining the principal digging direction and technique for oil-field development adjustment.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for evaluating the degree of water washing of sandstone oil layers in ultra-low permeability water drive reservoirs. Background technique [0002] The degree of water washing refers to the degree to which the core is displaced by the injected water during the water injection development process of the oilfield. It is generally divided into three levels: strong water washing, medium water washing and weak water washing. In the process of oil field development, by analyzing the water washing characteristics, water washing degree and influencing factors of various oil layers, it is possible to preliminarily evaluate the water flooding development effect of the water injection development oil field, determine the remaining oil type and distribution of the oil layer, and clarify the main potential of oil field development adjustment direction and technical approa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B49/08E21B43/20
Inventor 李安琪高春宁武平仓余光明李文宏段文标金栓联康兴妹刘蕾
Owner PETROCHINA CO LTD
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