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Low-permeability reservoir CO2 miscible-phase displacement critical well spacing calculation method

A calculation method and miscible flooding technology, applied in calculation, wellbore/well components, earthwork drilling and production, etc.

Active Publication Date: 2019-10-11
SHENGLI COLLEGE CHINA UNIV OF PETROLEUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the low permeability reservoir CO 2 Technical problems in the calculation method of miscible flooding limit well spacing, providing a low permeability reservoir CO 2 Calculation Method of Miscible Flooding Ultimate Well Spacing

Method used

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  • Low-permeability reservoir CO2 miscible-phase displacement critical well spacing calculation method
  • Low-permeability reservoir CO2 miscible-phase displacement critical well spacing calculation method
  • Low-permeability reservoir CO2 miscible-phase displacement critical well spacing calculation method

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Embodiment Construction

[0079] The technical scheme of the present invention will be described in detail and clearly below in conjunction with the application of the present invention in a low-permeability oil reservoir in eastern my country. In the actual application process, the present invention presses figure 1 Provides a low permeability reservoir CO 2 Flowchart of calculation method for miscible flooding limit well spacing. The specific operation is shown in the following examples.

[0080] Step S1: Establish low permeability reservoir CO 2 Miscible flood seepage physical model;

[0081] CO 2 Cannot be miscible with crude oil in initial contact, but at sufficiently high formation pressure CO 2 Can be dynamically miscible with crude oil. Crude oil and CO 2 The dynamic miscibility between phases is achieved by the mass transfer of components between phases. When CO 2 When in contact with crude oil, part of the CO 2 Dissolved in crude oil, while CO 2 It also extracts some hydrocarbons f...

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Abstract

The invention provides a low-permeability reservoir CO2 miscible-phase displacement critical well spacing calculation method which comprises the steps of building a low-permeability reservoir CO2 miscible-phase displacement seepage physical model according to three seepage areas, i.e. a pure CO2 seepage area, a CO2 concentration attenuation area and a pure oil seepage area divided according to thechange of a fluid property in the CO2 miscible-phase displacement process; building a low-permeability reservoir CO2 miscible-phase displacement percolating mathematic model; sequentially solving thelow-permeability reservoir CO2 miscible-phase displacement mathematic model according to the sequence of the pure CO2 percolating area, the CO2 concentration attenuation area and the pure oil area; and programming a key algorithm, and drawing a theoretical chart for low-permeability reservoir CO2 miscible-phase displacement according to actual properties of a reservoir. According to the method, acritical well spacing is calculated by adopting a miscible-phase frontal-advance distance and a producing well pressure spread range as the basis, the factors such as miscible-phase percolating resistance, expected yield and a fluid physical property change are considered, and a calculation model is close to the actual properties of the reservoir, so that a calculated result is reliable and can be used for guiding low-permeability reservoir CO2 miscible-phase displacement development.

Description

technical field [0001] The present invention relates to the technical field of oil and gas exploitation, more specifically, to a low-permeability reservoir CO 2 Calculation method of miscible flooding limit well spacing. Background technique [0002] CO 2 Oil flooding technology is the CO 2 A technology that is injected into an oil reservoir to enhance oil recovery from an oilfield. CO 2 The oil displacement mechanism mainly includes: (1) CO 2 It has good miscibility with crude oil and can significantly reduce the viscosity of crude oil; (2) CO 2 Soluble in crude oil and water, make it carbonated, improve the mobility ratio of crude oil and water; (3) CO 2 After being injected into the oil reservoir, the volume of the crude oil is greatly expanded, which can increase the elastic energy of the formation; (4) CO 2 Extraction and vaporization of light hydrocarbons in crude oil; (5) CO 2 After mixing with crude oil, it can not only extract and vaporize light hydrocarbons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/16E21B43/30G06Q50/02
CPCE21B43/164E21B43/30G06Q50/02
Inventor 迟杰
Owner SHENGLI COLLEGE CHINA UNIV OF PETROLEUM