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Multi-cluster perforation fracturing method with variable perforation size and variable perforation density and uniform liquid feeding and sand feeding

A variable aperture, shower technology, applied in the field of horizontal well fracturing, can solve the problem of lack of quantitative design methods

Active Publication Date: 2019-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the past, the perforation technology with variable pore diameter and variable pore density was also proposed, but it lacked quantitative design methods as a basis, and it was often based on experience.

Method used

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  • Multi-cluster perforation fracturing method with variable perforation size and variable perforation density and uniform liquid feeding and sand feeding
  • Multi-cluster perforation fracturing method with variable perforation size and variable perforation density and uniform liquid feeding and sand feeding
  • Multi-cluster perforation fracturing method with variable perforation size and variable perforation density and uniform liquid feeding and sand feeding

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Embodiment

[0082] In Well A, the lithology of the target interval is feldspar sandstone, with well-developed natural fractures. The fracturing section of the target layer is 2870.2-2902.0m, the average Young's modulus of the reservoir is 27.6GPa, and the average Poisson's ratio is 0.25; the stress difference between the target layer and the upper barrier is about 8MPa, and the stress difference between the target layer and the lower barrier is about 13MPa ; The target layer temperature is 113°C. In order to understand the oiliness and productivity of the target layer, and to carry out the next step of exploration and evaluation work in this block, the fracturing scheme design and field pilot test of this well were carried out by referring to the process method proposed in this patent and combining with the actual situation of this well. , the specific implementation method and effect are as follows:

[0083] (1) Reservoir parameter evaluation: According to seismic, geological, logging a...

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Abstract

The invention discloses a multi-cluster perforation fracturing method with a variable perforation size and variable perforation density and uniform liquid feeding and sand feeding. The multi-cluster perforation fracturing method is characterized in that the displacement of each cluster perforation is equal, and is equal to the total injection displacement divided by the number of clusters of perforations in segments. The multi-cluster perforation fracturing method comprises the steps that (1) key reservoir parameters are evaluated; (2) segment cluster locations are determined; (3) crack parameters are optimized; (4) fracturing construction parameters are optimized; (5) adjacent well segment cluster is subjected to liquid feeding and proppant feeding monitoring parameter analysis; (6) average displacement of each cluster of perforations is subjected to distribution; (7) pressure of the wellbore at each cluster of perforations of a horizontal wellbore is calculated; (8) adjustment of thenumber of perforations and aperture of each cluster perforations are performed; (9) fine adjustment of overall cluster perforation scheme in the segments is performed; (10) a bridge plug is lowered and the cluster perforations are subjected to joint operation; (11) acid pretreatment and prepad liquid width generating and sand-carrying fluid sand feeding are performed; and (12) replacement operation is performed. The multi-cluster perforation fracturing method increases the uniformity of liquid feeding and sand feeding between the perforation clusters, improves the distribution of the fracturing fluid and the proppant between the perforation clusters, increases the overall transformation volume of the cracks, and maximizes the reservoir yield-increasing effect.

Description

technical field [0001] The invention relates to the technical field of horizontal well fracturing, and furthermore, relates to a multi-cluster perforation fracturing method with variable pore diameter, variable pore density and uniform liquid and sand injection. The invention can be used in staged fracturing of horizontal wells in carbonate rock, sandstone, shale and other reservoirs. Background technique [0002] At present, in staged fracturing of horizontal wells, bridge plug perforation combined technology is widely used. The multi-cluster perforation technology used generally adopts the perforation strategy of equal aperture and equal density. This is based on the perforation strategy of each cluster. It is assumed that the fracturing fluid and proppant are uniformly fed into each cluster, but the actual situation is that due to the heterogeneity of the fracturing target layer, it is difficult to ensure that each cluster is uniformly fed with fluid and sand. A large nu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/11E21B43/119
CPCE21B43/26E21B43/11E21B43/119
Inventor 蒋廷学吴峙颖安生周林波魏娟明黄静刘世华贾文峰
Owner CHINA PETROLEUM & CHEM CORP
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