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Method for forming multiple fractures by forced planar diverting of fracture opening being temporarily plugged

A technology of plane and caulking, which is applied in the directions of earthwork drilling, fluid production, wellbore/well components, etc. It can solve the problems of artificial fracture extension direction deviating from reservoir development orientation, increasing communication probability, and inability to obtain productivity.

Active Publication Date: 2015-11-11
CHINA UNIV OF PETROLEUM (BEIJING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heterogeneity of carbonate reservoirs in my country is extremely strong, and the artificial fracture extension direction of conventional acid fracturing technology sometimes deviates from the development orientation of the reservoir body. To obtain production capacity, fracture plane steering technology must be considered to increase the chance of communication

Method used

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  • Method for forming multiple fractures by forced planar diverting of fracture opening being temporarily plugged
  • Method for forming multiple fractures by forced planar diverting of fracture opening being temporarily plugged
  • Method for forming multiple fractures by forced planar diverting of fracture opening being temporarily plugged

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Embodiment 1

[0084] This embodiment also provides a method for temporarily sealing the seams and forcing the plane to turn to form multiple seams. Taking YMA well in Tarim Basin oilfield as an example, acid fracturing is carried out. YMA well is an evaluation well in Tarim oilfield, and the target layer of stimulation is the Ordovician reservoir section. like figure 1 As shown, from the root mean square amplitude plan view of the target layer (5845-5920 meters) after the completion of Well YMA, the target layer of this well is in a weak amplitude zone, and there is a strong amplitude zone (multiple indicating reservoirs with well-developed fractures and caves). The actual drilling trajectory of Well YMA shows that the target layer is far away from the strong amplitude area, and the stress matching relationship is conducive to the extension of artificial fractures to the reservoir body, but the direction of natural fracture development makes artificial fractures unfavorable to communicate ...

Embodiment 2

[0113] This embodiment also provides a method for temporarily sealing the seams and forcing the plane to turn to form multiple seams. Taking Well KSA in the Tarim Basin Oilfield as an example, hydraulic sand fracturing was implemented for the oil well. Well KSA is an evaluation well in the Tarim Oilfield, and the target layer for stimulation is the Cretaceous Bashijiqike Formation reservoir section. The target layer Cretaceous Bashijiqike Formation sees oil and gas shows of 85.0m / 26 layers, of which the well section 6528.00-6531.00m shows well, the lithology is brown fine sandstone, and the total hydrocarbon of gas test is 1.69↑3.49%; the test section (6406- 6578) developed a total of 46 fractures, with a fracture density of 0.26 fractures / m and a surface fracture ratio of 0.061%. Well Keshen 506 is located in the core of the anticline, and fractures are mainly developed in the Ba2 Member, and fractures are moderately developed in the comprehensive evaluation test section. Pre...

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Abstract

The invention provides a method for forming multiple fractures by forced planar diverting of a fracture opening being temporarily plugged. The method includes: allowing temporary plugging diverting material fluid to a position near the fracture opening in a reservoir so as to form a bridge plug and force the fracture to divert, forming multiple fractures, activating micro-fractures of the reservoir with active liquid or acid liquid, and forming a multi-fracture mesh. The method according to the technical scheme has the advantages that artificial fractures in unconventional oil-gas reservoirs, such as low-permeability and ultralow-permeability oil-gas reservoirs, tight oil reservoirs and shale oil-gas reservoirs, are forced to divert in the plane, forming multiple artificial fractures having guiding ability, chances to connect reservoir bodies are increased, drainage area is enlarged, cleaning diverting material is of degradability and can fully degrade after construction, all the fractures can be utilized, and yield increase is more obvious.

Description

technical field [0001] The invention relates to a method for temporarily plugging a seam and forcing a plane to turn to form multiple seams, which belongs to the technical field of petroleum and natural gas exploitation. Background technique [0002] my country is rich in low-permeability oil and gas resources. With the deepening of exploration and development, the proportion of production of low-permeability oil and gas reservoirs has gradually increased. How to realize the efficient development of low-permeability oil and gas reservoirs is very important. Low-permeability oil and gas reservoirs are of poor quality and generally require fracturing or acid fracturing. However, low-permeability reservoirs often have strong heterogeneity, and the double-wing fractures formed during conventional fracturing sometimes cannot communicate with heterogeneously distributed reservoirs, or cannot connect with "sweet spots" where natural fractures develop, resulting in poor stimulation ...

Claims

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Application Information

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IPC IPC(8): E21B43/27E21B43/26E21B33/13
Inventor 周福建杨向同何君袁学芳练以锋黄世财谭艳新李秀辉汪道兵黄龙藏袁泽波
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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