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Layer-by-layer allocation method for multi-layer reservoirs considering interlayer interference

A technology for interlayer interference and oil reservoirs, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., and can solve the problems of not considering interlayer interference and water cut rise

Active Publication Date: 2015-12-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0004] At present, the layer combination of stratified injection in multi-layer reservoirs in China is mainly based on the stratigraphic division of the target unit, and the influencing factors such as interlayer interference and water cut increase are not considered in the injection allocation

Method used

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  • Layer-by-layer allocation method for multi-layer reservoirs considering interlayer interference
  • Layer-by-layer allocation method for multi-layer reservoirs considering interlayer interference
  • Layer-by-layer allocation method for multi-layer reservoirs considering interlayer interference

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0048] The present invention considers interlayer interference layered distribution method of multi-layer reservoir, comprising the following steps:

[0049] Step (1) Select the allocation unit and collect basic data: According to the actual situation of the oilfield, select the production block that needs to maintain the formation pressure for injection, and collect the following basic data: bottom hole flowing pressure, formation pressure, effective thickness, crude oil viscosity , permeability, wellbore radius.

[0050] Step (2) Determination of the influence of the permeability difference on the water absorption index:

[0051] Through the permeability gradient experiment, an...

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Abstract

The invention discloses a stratified injection allocation method considering interlayer interference for a multilayer oil reservoir. The method comprises the following steps: first, selecting an injection allocation unit, and searching basic data; then, determining the influence of permeability differential and moisture content on a water injectivity index; next, determining the influence of viscosity differential on the water injectivity index; later on, setting an injection allocation scheme according to the permeability differential ad the viscosity differential; finally, calculating the injection allocation quantity of each scheme according to an interlayer interference formula, and optimizing an optimal injection allocation scheme. According to the stratified injection allocation method considering the interlayer interference for the multilayer oil reservoir disclosed by the invention, an interlayer interference coefficient can be determined through experiments; the actual injection amount required by a stratum considering the interlayer interference can be optimized and calculated, actual situations of an oilfield are met better, and the method is applicable to stratified allocation injection of the multilayer oil reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a layered injection method for multi-layer reservoirs considering interlayer interference; mainly using experimental methods to measure the influence of interlayer interference factors on water absorption index in different oil reservoirs, and regression interference coefficient parameters , and used for stratified allocation optimization to overcome the problem of interlayer interference when multi-layer injections are combined. Background technique [0002] Heterogeneous multi-reservoir oilfields are composed of several or even dozens of oil layers, some of which have high permeability and some have low permeability. In this way, during injection, high-permeability oil layers are different from medium- and low-permeability oil layers in terms of water absorption capacity, waterline advancement speed, formation pressure, oil production rate, water flooding,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/20E21B49/00
Inventor 张凯倪威朱天玉张黎明路然然
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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