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Method for predicting period of re-enriching remaining oil of water flooding reservoir into new reservoir

A prediction method, a technology for remaining oil, applied in earthmoving, fluid production, wellbore/well components, etc., can solve problems such as lack of prediction methods

Inactive Publication Date: 2015-06-24
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This situation can be called oil and gas re-migration and accumulation or re-accumulation or re-enrichment, but there is no simple and practical method for predicting how long it takes for the remaining oil to re-enrich, that is, the re-enrichment accumulation period. The distribution of remaining oil in the ultra-high water-cut late stage of flooding reservoirs is more dispersed, and the difficulties faced by oilfields in stabilizing production and adjusting potential. A new method for predicting the re-enrichment accumulation period of remaining oil in water flooding reservoirs has been invented, which solves the above technical problems

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  • Method for predicting period of re-enriching remaining oil of water flooding reservoir into new reservoir
  • Method for predicting period of re-enriching remaining oil of water flooding reservoir into new reservoir
  • Method for predicting period of re-enriching remaining oil of water flooding reservoir into new reservoir

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Embodiment 1

[0134] In a specific embodiment 1 of applying the present invention:

[0135] Oilfield 1 is a typical strip-shaped narrow-roof fault-block reservoir with a buried depth of 1950m and an oil-bearing area of ​​0.92km 2 , the effective thickness of the oil layer is 9.3m, the porosity is 27.5%, and the air permeability is 673×10 -3 μm 2 , formation crude oil viscosity 9.3mPa.s, geological reserves 119×10 4 t, the formation dip angle is 12.5°, and the oil-bearing strip is 3.6km long and 100m-250m wide. One oil well was opened before the test, with a daily oil production of 0.4t / d, a comprehensive water cut of 97.7%, a dynamic liquid surface of 800m, and a recovery rate of 31.5%. It has entered the stage of ultra-high water cut and near technical abandonment.

[0136] In April 2008, 8 scrapped oil-water wells in adjacent blocks were used to inject water outside the original oil-bearing boundary, and the highest single-well daily injection reached 500m 3 Above, the cumulative wate...

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Abstract

The invention provides a method for predicting a period of re-enriching remaining oil of a water flooding reservoir into a new reservoir. The method comprises the following steps of (1) gaining a value of water saturation of a researched oil reservoir; (2) selecting a corresponding oil and water delivery speed formula of the water flooding reservoir according to the value of the water saturation; and (3) calculating the maximum time of re-enriching the remaining oil of the water flooding reservoir into the new reservoir, namely the period of re-enriching the remaining oil of the water flooding reservoir into the new reservoir, by using the selected oil and water delivery speed formula of the water flooding reservoir. The method for predicting the period of re-enriching remaining oil of the water flooding reservoir into the new reservoir points out the direction for strategic adjustment of low-efficiency oil reservoir development at an ultra-high-water content stage, periodic oil reservoir injection-production development, capacity recovery and re-development of an oil reservoir which is about to be abandoned, and the like. Therefore, the method is wide in popularization and application prospect and high in economic benefit and social benefit.

Description

technical field [0001] The invention relates to the field of potential tapping and enhanced recovery in the late development stage of water drive reservoirs, in particular to a method for predicting the period of re-enrichment and accumulation of remaining oil in water drive reservoirs. Background technique [0002] Remaining oil generally refers to the remaining movable resources of the reservoir after the primary and secondary oil recovery, when the reservoir enters the late stage of development with high water cut, which is a dynamic variable amount. Shengli Oilfield has entered a high-water-cut development period. As the degree of exploitation deepens, the distribution of remaining oil becomes more dispersed, and oilfields face increasing challenges in terms of stable production, adjustment and tapping of potential. Therefore, accurately describing and predicting the remaining oil in the oil reservoir, especially the distribution state of the enriched part, is the basis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20
CPCE21B43/20
Inventor 孙焕泉杨勇王建刘维霞胡罡宋志超吴义志王瑞
Owner CHINA PETROLEUM & CHEM CORP
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