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Method for determining polymer flooding viscosity ratio

A polymer-viscosity ratio technology, applied in earth-moving drilling, production fluids, wellbore/well components, etc., can solve problems such as inaccurate definition of polymer-flooding viscosity ratio boundaries

Inactive Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0009] The present invention provides a method for determining the polymer flooding viscosity ratio in order to solve the problem of inaccurate definition of the polymer flooding viscosity ratio limit in the prior art; the present invention uses a streamline simulation method, considering the adsorption and polymerization of polymers The influence of the substance solution on the phase osmotic curve overcomes the defects of the prior art

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  • Method for determining polymer flooding viscosity ratio
  • Method for determining polymer flooding viscosity ratio
  • Method for determining polymer flooding viscosity ratio

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Embodiment

[0250] Assuming a five-point well pattern in a homogeneous oil reservoir, the oil-water well spacing is 250m, the porosity is 15%, the oil layer thickness is 6.1m, the irreducible water saturation is 36.3%, the remaining oil saturation is 20.5%, the wellbore radius is 0.15m, and the injection well injects constant The amount is 60m 3 / d, take 1 / 8 of the homogeneous five-point well pattern as the processing unit, and divide the processing unit into 4 triangular flow pipes according to the angle. The fitting parameters of the relative permeability curve of the oil phase are: m=2.5563, a1=1; the fitting parameters of the relative permeability curve of the water phase are: n=1.5, a2=0.38. The time step of acquisition is set to 1 day and the distance step is 1 meter.

[0251] By using the method of the invention, the variation of the sweep coefficient under the condition of different polymer viscosities can be obtained very conveniently. The viscosity of formation crude oil is 40...

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Abstract

The invention discloses a method for determining polymer flooding viscosity ratio. According to the method, a polymer flooding principle is used, mathematical models such as a fractional flow equation and a frontal displacement equation are established in an oil displacement process, a five-spot well pattern geometric model is established by a stream-tube method, conformance efficiencies under different viscosity ratio conditions are obtained, thereby, a relation curve among the viscosity ratio, the conformance efficiencies and oil displacement efficiency can be obtained, and a set of obtained methods for accurate limit of reasonable viscosity ratio in a polymer flooding process on basis of a fractional flow principle is formed. Compared with methods in the prior art, the method for determining the polymer flooding viscosity ratio has the advantages that input costs of polymers are greatly reduced, the crude oil recovery ratio is effectively increased, and economic benefits and social benefits are extremely large.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and development, in particular to a method for determining the viscosity ratio of polymer flooding. Background technique [0002] Polymer flooding is a very effective technology for enhancing oil recovery by improving the mobility ratio and sweep coefficient. In the process of polymer flooding, the viscosity ratio of displacement fluid to crude oil is one of the main factors affecting the recovery factor, which in turn affects the economic benefits of chemical flooding. [0003] Viscosity ratio control is the core of polymer flooding. On the one hand, it affects the oil recovery rate, and on the other hand, it also affects the cost of oil flooding. The higher the viscosity ratio, the greater the degree of enhanced recovery, but the increase in viscosity ratio is at the expense of increasing the amount of chemical agents, so an optimal point must be found to maximize the input-output ratio. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 王强聂俊
Owner CHINA PETROLEUM & CHEM CORP
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