A variable-intensity water injection production method for carbonate fracture-cavity reservoirs

A carbonate rock and water injection mining technology, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problems of gradual failure, low-efficiency water injection, limited applicable strata, etc., and achieve enhanced oil recovery. , the effect of expanding the swept volume

Active Publication Date: 2015-12-02
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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  • A variable-intensity water injection production method for carbonate fracture-cavity reservoirs
  • A variable-intensity water injection production method for carbonate fracture-cavity reservoirs
  • A variable-intensity water injection production method for carbonate fracture-cavity reservoirs

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Embodiment 1

[0038] The combination is based on the six types of reservoir spaces basically confirmed in the Tahe Oilfield, considering the spatial distribution of fractures, cavities, and karst caves, as well as the degree of connectivity between pores (karst) and caves, such as Figure 1A , Figure 1B , Figure 1C , Figure 1D , Figure 1E with 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, cave-fracture-dissolved cave type, dissolved pore-fracture-cavity type, and cave network type.

[0039] 1. Experimental conditions

[0040] (1) Experimental model: According to the above 6 main fracture-cavity combination modes, design a specific fracture-cavity distribution map (such as Figure 2B , Figure 3B with Figure 4B (Shown), using natural carbonate rock outcrops from Tahe Oilfield, crushed and sieved to obtain carbonate rock powder with similar surface physical properties, u...

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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 exploitation method in the process of oil exploitation, in particular to a variable intensity water injection exploitation method for carbonate fracture-cavity reservoirs, belonging to the technical field of oil and gas production increase in the field of oil exploitation. Background technique [0002] Carbonate reservoirs are important reservoir types, which contain more than 60% of the world's oil and gas resources, while fracture-cavity reservoirs account for more than 30% of carbonate reservoirs. Many large foreign oil and gas fields, such as the Packett and Yates oil fields in western Texas, the Golden Harbor oil fields in eastern Mexico, and most of the oil fields in Saudi Arabia, Iraq, Iran, Oman, Syria and other countries in the Middle East are made of carbon. Composition of salt rock fracture-cavity reservoir. [0003] In recent years, domestic breakthroughs have been made in the exploration and development...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): E21B43/20
Inventor李阳袁向春刘中春唐永强郑松青吕心瑞
OwnerCHINA PETROLEUM & CHEM EXPLORATION & PRODION RES INST