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Fracture-vug type carbonate reservoir water breakthrough early warning method

A carbonate reservoir, fracture-cavity technology, applied in the direction of prediction, instrumentation, data processing applications, etc., can solve problems such as difficult to realize water breakthrough early warning, to prolong the water-free oil recovery period, improve oil well recovery, Optimizing the effect of the working system

Inactive Publication Date: 2016-09-21
恒泰艾普(北京)能源科技研究院有限公司 +1
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Problems solved by technology

At present, it is difficult to realize early warning of water breakthrough unilaterally relying on the static data of reservoirs and the existing understanding of water cut change laws, so it is necessary to establish a fast and effective method for early warning of water breakthrough in reservoirs

Method used

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  • Fracture-vug type carbonate reservoir water breakthrough early warning method
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  • Fracture-vug type carbonate reservoir water breakthrough early warning method

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Embodiment Construction

[0039] A water breakthrough early warning method for a fractured-cavity carbonate reservoir of the present invention comprises the following steps:

[0040] S01: According to the material balance equation, calculate the oil pressure drop under different accumulative fluid production volumes, and draw the relationship diagram between well oil pressure drop and accumulative fluid production volume; during this period, the oil pressure will be measured multiple times and the oil pressure will be recorded .

[0041] S02: For a water-free reservoir, if the well pressure drop and cumulative fluid production curve deviate, there are three possibilities: ① crude oil is degassed in the wellbore or formation, ② new reservoirs are produced, ③ edge and bottom water start the invasion;

[0042] S03: Exclude the degassing of crude oil in the wellbore or formation and the production of new reservoirs, and determine that the edge and bottom water of the reservoir has begun to invade;

[004...

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Abstract

A fracture-vug type carbonate reservoir water breakthrough early warning method of the present invention relates to an oil well water breakthrough early warning method, and aims to determine the water invasion time timely, optimize a working system, prolong an oil well water-free oil production period, and improve the oil well recovery efficiency. The method of the present invention comprises the following the steps of S01 obtaining the oil pressure drop under different accumulative liquid volumes according to a matter balance equation, and drawing a relational graph of the oil well pressure drop and the accumulative liquid volume; S02 for the non-water breakthrough reservoir, if a oil well pressure drop and accumulative liquid volume curve deviates, explaining three possible phenomena: (1) the crude oil is degassed in a shaft or stratum; (2) a new reservoir is exploited; (3) the edge-bottom water begins to invade; S03 excluding the two situations that the crude oil is degassed in the shaft or stratum and the new reservoir is exploited to determine that the reservoir edge-bottom water begins to invade; S04 determining the water invasion time according to the relational graph of the oil well pressure drop and the accumulative liquid volume, and carrying out the water breakthrough early warning.

Description

technical field [0001] The invention relates to an early warning method for water breakthrough in an oil reservoir. Background technique [0002] The Ordovician carbonate reservoirs in Halahatang Oilfield, Tarim Basin are dominated by fractures and caves, with extremely irregular development and strong heterogeneity. Many large-scale reservoirs also have bottom water . Water breakthrough in oil wells is the main reason for reservoir decline, and many high-production wells have rapid decline in production due to rising water cut. At present, it is difficult to realize early warning of water breakthrough unilaterally relying on the static data of reservoirs and the existing understanding of water cut change rules. Therefore, it is necessary to establish a fast and effective method for early warning of water breakthrough in reservoirs. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an early warning method for wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/06
CPCG06Q10/04G06Q50/06
Inventor 王连山孙银行张卫国张茂孙庚文汤承锋
Owner 恒泰艾普(北京)能源科技研究院有限公司
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