Method for predicting crude oil production ratio of water-drive oil reservoir

A prediction method and technology of recovery rate, applied in the direction of mining fluid, earth cube drilling, special data processing application, etc., can solve the problems of widely varying development methods, lack of versatility and practicability, and achieve the effect of accurate interpretation and analysis

Active Publication Date: 2017-05-10
PETROCHINA CO LTD
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Problems solved by technology

[0017] At present, there are two main problems in the existing relationship curve between water cut and recovery degree. The conditions of different strata are not the same, and the development methods are also very different; the second is that the

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  • Method for predicting crude oil production ratio of water-drive oil reservoir
  • Method for predicting crude oil production ratio of water-drive oil reservoir
  • Method for predicting crude oil production ratio of water-drive oil reservoir

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Embodiment 1

[0067] This embodiment provides a method for predicting oil recovery in water drive reservoirs, the method comprising the following steps:

[0068] Step 1. Divide the production history of the oilfield into several development stages according to the data point shape of the cumulative water and oil production in the actual oilfield distributed according to the Type A water drive characteristic curve; the specific process is as follows:

[0069] The cumulative water production and cumulative oil production of the actual oilfield are plotted in the coordinate system according to the type A water drive characteristic curve relationship, and the production history of the oilfield is divided into several development stages according to the shape of data points. The relationship between cumulative water production and cumulative oil production in corresponding development stages is:

[0070] log(W pi ) = a i +b i N pi i=1,2,3,...,N (Formula 2),

[0071] In Equation 2 above: W ...

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Abstract

The invention provides a method for predicting the crude oil production ratio of a water-drive oil reservoir. The method comprises the following steps that the oil field production history is divided into a plurality of development stages according to the data point form of the actual oil field cumulative water output and cumulative oil output which are distributed according to an A type water-drive characteristic curve; relations, of the water cut and the recovery degree, containing production parameters in the corresponding development stages are separately established, wherein the production parameters in the corresponding development stages comprise the initial water cut, the initial recovery degree, the economic limit water cut and the prediction crude oil production ratio under the condition of the economic limit water cut; and the crude oil production ratio is predicted according to the relations of the water cut and the recovery degree in all the development stages. By adoption of the method for predicting the crude oil production ration of the water-drive oil reservoir, the variation conditions of the water cut and the recovery degree in all the development stages can be more reasonably reflected, and accordingly the crude oil production ration is effectively predicted.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir exploitation, and in particular relates to a method for predicting the recovery rate of crude oil in a water drive oil reservoir. Background technique [0002] In the process of reservoir development, the relationship between reservoir water cut and oil recovery degree is the key to evaluate the effect of reservoir development. Comparing the actual curve and theoretical curve of reservoir water cut and oil recovery degree can evaluate the The law of water cut rise and development status at different development stages reflect the development potential of the reservoir. Therefore, it is very important to obtain an accurate and reliable relationship between reservoir water cut and oil recovery degree to evaluate the development degree of the reservoir. At present, there are mainly the following expressions for the relationship between reservoir water cut and oil recovery degree: [0003] 1) T...

Claims

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Application Information

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IPC IPC(8): E21B43/20G06F19/00
CPCE21B43/20G16Z99/00
Inventor 傅礼兵倪军李轩然许必锋赵伦范子菲
Owner PETROCHINA CO LTD
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