Method for predicting well yield of sealed, unsaturated oil reservoirs through elastic driving water-flooding extraction

A technology of elastic drive and prediction method, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve problems such as unfavorable production, prediction, production of difficult oil wells, etc.

Active Publication Date: 2015-01-07
CHENGDU NORTH OIL EXPLORATION DEV TECH
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Problems solved by technology

In the previous reservoir engineering research, the impact of continuous production on reservoir pressure and water cut was mainly considered during the reservoir development process, but there were few quantitative descriptions of oil well production under the condition of artifi

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  • Method for predicting well yield of sealed, unsaturated oil reservoirs through elastic driving water-flooding extraction

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Embodiment 1

[0030] Such as figure 1 As shown, the prediction method of oil well production in closed unsaturated reservoir elastically driven by water injection,

[0031] Step 1: Measure the original volume coefficient B of crude oil with the formation high-pressure physical property analyzer oi and the volume coefficient B under different pressure conditions o ;

[0032] Step 2: Extract and wash the core to determine the original oil saturation S of the core oi and the original water saturation S wc ;

[0033] Step 3: Measure the compression coefficient C of formation crude oil with PVT high-pressure physical property meter o and formation water compressibility C w , using a rock mechanics tester to measure the rock compressibility C p ;

[0034] Step 4: Using the test results of Step 1, Step 2, and Step 3, calculate the effective compressibility coefficient C of the rock eff , effective rock compressibility C eff The calculation formula is: ;

[0035] Step 5: Calculate the ...

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Abstract

The invention discloses a method for predicting the well yield of sealed, unsaturated oil reservoirs through elastic driving water-flooding extraction. The method includes: measuring the initial volume coefficient Boi of crude oil and the volume coefficient Bo of the crude oil under different pressure conditions, measuring the initial oil saturation Soi and the initial water saturation Swc of the rock core, generally measuring the in-place oil compression coefficient Co, the formation water compression coefficient Cw and the rock compression coefficient Cp, obtaining the rock effective compression coefficient Ceff according to the above parameters; measuring the oil geological reserves N and the reservoir pressure under a certain injection condition according to a matter balance equation, and finally measuring the yield of an oil well according to a plane radial flow Darcy equation, wherein the yield includes oil yield and water yield. The method supplements the correspondence between injected water and oil reservoir pressure change under the water-flooding extraction condition, accordingly can predict the daily oil yield and the daily water yield under the water-flooding extraction condition, and provides reference value for oil field production cost.

Description

technical field [0001] The invention belongs to the field of oil reservoir engineering technology and a method for predicting the output of oil wells under the condition of artificial water injection development, which belongs to the post-conversion development technology of natural energy development of closed and unsaturated oil reservoirs, that is, the method for predicting the output of oil wells in closed and unsaturated oil reservoirs elastically driven by water injection . Background technique [0002] The main professional concepts involved in this technical field are as follows: [0003] 1. Closed oil reservoir: Refers to the oil reservoir connected by no water body. It mainly refers to some lithological trap reservoirs or reservoirs with weak edge and bottom water that have little influence on reservoir development. weak. [0004] 2. Unsaturated reservoir: refers to the reservoir not saturated by gas. Its main feature is that the formation pressure of the reser...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B43/20
CPCE21B43/20E21B49/00
Inventor 卢立泽王贺华曹剑张博米中荣杨鸿闫志军付辉蒋利平何巍臧克一杜新龙刘榧黄海平杨滔桂碧雯张健钱利王荣新周长江徐兵
Owner CHENGDU NORTH OIL EXPLORATION DEV TECH
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