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Calibration method for oil recovery rate of karst-fissure-cavity carbonatite reservoir

A technology for carbonate rock reservoirs and karst fracture-cavity types, which is applied in special data processing applications, instruments, electrical and digital data processing, etc. Effect

Inactive Publication Date: 2015-06-10
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

The method of using dynamic data to calibrate the recovery factor is mainly the decline method, but due to the complex water cut law, the calculation results have large deviations

Method used

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  • Calibration method for oil recovery rate of karst-fissure-cavity carbonatite reservoir
  • Calibration method for oil recovery rate of karst-fissure-cavity carbonatite reservoir
  • Calibration method for oil recovery rate of karst-fissure-cavity carbonatite reservoir

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with drawings and embodiments.

[0037] The invention provides a method for calibrating the recovery factor of a karst fracture-vug carbonate reservoir, which specifically includes the following steps:

[0038] (1) The production wells in the oil reservoir where the oil production has ended are taken as the calculation unit, and the production wells are considered to be the production wells when one of the following events occurs in the production well: the well is shut down due to low pressure and low production, the production well is flooded violently, the production well is transferred to injection, Or the producing degree of production well reserves is above 80%.

[0039] At the same time, due to the different characteristics of oilfield reservoir space configuration and fluid properties in different parts, different types of instances can be distinguished when selecting calculation units. Accord...

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Abstract

The invention provides a calibration method for oil recovery ratio of a karst-fissure-cavity carbonatite reservoir. The method takes production wells with the ending of oil recovery in the oil reservoir as calculation units, calculating the primary recovery rate of each calculation unit, judging the type of a reservoir body of a reservoir stratum of each calculation unit, calculating fitting recovery rates of different types of calculation units according to a karst-fissure-cavity recovery ratio empirical formula and a fissure type recovery empirical formula, and finally evaluating calculation results through error analysis and scatter diagram analysis. The influence of reservoir property, flow property, oil reservoir property and oil reservoir energy on the recovery ration is fully considered; the main controlling factor items in the formulas are sufficient in theoretical basis and complete in data; all factors with influence on the recovery rate are objectively reflected. The calculation ideas and methods serve as supplement and completion of the conventional method for calculating the oil reservoir recovery ratio of carbonatite; the method has a practical value in calibration and calculation of the recovery rate in the last stage of exploration and the initial stage of the development of the oil reservoir of the carbonatite.

Description

technical field [0001] The invention relates to a method for calibrating the recovery factor of a karst fracture-cavity carbonate rock reservoir, belonging to the technical field of mining. Background technique [0002] For karst fracture-cavity carbonate reservoirs at the end of exploration and early development, when the geological development data is not perfect, the primary oil recovery rate is calibrated, so as to formulate and revise the development and planning of each block in a timely and appropriate manner. Developing improvement programs is of great value. The primary oil recovery rate is referred to as the primary recovery rate. At present, the primary recovery calibration method is generally divided into three stages at home and abroad: the early stage of development, the middle stage of development, and the late stage of development. In the early stage of development, the empirical formula method, table estimation method, and analogy method are mainly used; i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 潘琳高建武张辉王建黄太柱吴涛
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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