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Variable intensity water injection exploitation method for carbonate fracture-cavity oil reservoir

A carbonate rock and water injection mining technology, which is applied in the direction of mining fluid, earth drilling, wellbore/well components, etc., can solve problems such as gradual failure, low-efficiency water injection, and limited applicable formations, and achieve the expansion of swept volume, The effect of enhanced oil recovery

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM EXPLORATION & PRODION RES INST +1
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Problems solved by technology

[0009] Among the above-mentioned water injection development methods, the advantages of single-well water injection huff and puff include rapid energy replenishment, raising the liquid level, etc., and the disadvantages include limited applicable formations and gradual failure after multiple cycles; while the advantages of multi-well water injection include continuous displacement, Lateral displacement, etc., the disadvantages include that the injected water is easy to form channeling channels, resulting in low-efficiency water injection, etc.

Method used

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  • Variable intensity water injection exploitation method for carbonate fracture-cavity oil reservoir
  • Variable intensity water injection exploitation method for carbonate fracture-cavity oil reservoir
  • Variable intensity water injection exploitation method for carbonate fracture-cavity oil reservoir

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Embodiment 1

[0038] Based on the six kinds of reservoir spaces confirmed in Tahe Oilfield, the combination is carried out, considering the spatial distribution of fractures, vugs, and caves, and the degree of connectivity between pores (karst) caves, such as Figure 1A , Figure 1B , Figure 1C , Figure 1D , Figure 1E and Figure 1F As shown, the fracture-cavity combination mode is divided into six types: fracture network type, isolated cave type, dissolved pore-fracture-dissolved pore type, karst-crack-cavity type, dissolved pore-fracture-cavity type, and karst-vug network type.

[0039] 1. Experimental conditions

[0040] (1) Experimental model: According to the above-mentioned 6 main fracture-cavity combination modes, design a specific fracture-cavity distribution map (such as Figure 2B , Figure 3B and Figure 4B shown), using the natural carbonate rock outcrop from Tahe Oilfield, crushing and sieving to obtain carbonate rock powder with close physical properties on the surfac...

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Abstract

The invention provides a variable intensity water injection exploitation method for a carbonate fracture-cavity oil reservoir. The variable intensity water injection exploitation method includes the following steps that a injection-exploitation well group is selected in a fracture-cavity unit and subjected to water injection, water injection intensity is adjusted in the water injection process, and water injection is stopped until earnings of oil exploitation are smaller than cost of water injection. According to the water injection exploitation method, a flow field is changed through variable intensity water injection, the swept volume can be enlarged, and then oil recovery is improved.

Description

technical field [0001] The invention relates to a water injection production method in the oil production process, in particular to a variable-intensity water injection production method for carbonate fracture-cavity reservoirs, and belongs to the technical field of oil and gas production enhancement in the field of oil production. Background technique [0002] Carbonate reservoirs are an important type of reservoirs, which contain more than 60% of the world's oil and gas resources, and fracture-cavity reservoirs account for more than 30% of carbonate reservoirs. Many large oil and gas fields abroad, such as the Puckett Oilfield and Yates Oilfield in west Texas, the Golden Harbor Oilfield in eastern Mexico, and most of the oilfields in Saudi Arabia, Iraq, Iran, Oman, Syria and other countries in the Middle East are covered by carbon dioxide. Composition of salt rock fracture-cavity reservoirs. [0003] In recent years, China has also made some breakthroughs in the explorati...

Claims

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Application Information

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IPC IPC(8): E21B43/20
Inventor 李阳刘中春袁向春唐永强郑松青吕心瑞
Owner CHINA PETROLEUM & CHEM EXPLORATION & PRODION RES INST
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