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Forced closing method for improving multi-layer fracturing crack support profile

A profile and fracturing technology, applied in the field of improving the forced closure of multi-layer fracture support profiles, can solve problems such as loss of meaning, and achieve the effect of improving support profiles and increasing the potential of multi-layer fracturing

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

AI Technical Summary

Problems solved by technology

At this time, the forced fracture closure technology is also meaningless for fractures with no or only a small amount of proppant in the fracturing target layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0050] In Well A, the lithology of the target interval is gray-white gas-bearing glutenite with well-developed natural fractures. The fracturing section of the target layer is 2437.9-2502.6m, divided into two layers for fracturing, the average Young's modulus of the reservoir is 47.6GPa, and the average Poisson's ratio is 0.20; the stress difference between the target layer and the upper interlayer is about 4.7MPa, and the lower The interlayer stress difference is about 6.5MPa; the target layer temperature is 102°C. In order to understand the gas-bearing property and production capacity of the target layer, and to carry out the next step of exploration and evaluation work in this block, the fracturing scheme design and on-site pilot of the well were carried out by referring to the process method proposed in this patent and combining with the actual situation of the well. The specific implementation method and effect of the test are as follows:

[0051] (1) Evaluation of reser...

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Abstract

The invention discloses a forced closing method for improving a multi-layer fracturing crack support profile. The forced closing method includes the steps that (1) critical reservoir parameters are evaluated; (2) a layered crack propagation law is simulated; (3) an ultra-low density proppant is selected; the mean grain size of the proppant is 1 / 10 to 1 / 6 of the minimum crack width; and the bulk density of the proppant is less than 1.4g / cm<3>; and (4) the shut-in time after pressure is simulated, specifically, according to the fracturing construction parameters of adjacent wells around a well,different shut-in time after pressure is set, the change of the concentration profile of the proppant in different time is observed, and if the concentration profiles of the proppant in two certain shut-in time are very close, the previous time is taken as the final shut-in time. The forced closing method comprehensively optimizes the grain size of the proppant, the shut-in time after pressure andthe like, improves the multi-layer fracturing crack support profile, overcomes the current technical limitations, and maximizes the post-pressure yield-increasing effect.

Description

technical field [0001] The invention relates to the technical field of drilling, and more specifically relates to a forced closure method for improving the support section of multi-layer fracturing fractures. The invention can be used in carbonate rock, sandstone, shale and other reservoirs, not only for vertical wells, but also for hydraulic fracturing of horizontal wells. Background technique [0002] At present, regardless of vertical multi-layer general fracturing or horizontal well cross-layer fracturing, forced fracture closure technology is required after fracturing to reduce filtrate damage of fracturing fluid and accelerate flowback of fracturing fluid and fracture closure process , to prevent serious damage to the diversion capacity of the seam caused by over-displacement. Due to the backflow effect of the proppant, if properly controlled, the proppant away from the fracture opening can be transported to the fracture opening for support again before the fracture c...

Claims

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Application Information

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IPC IPC(8): E21B43/267E21B49/00
CPCE21B43/267E21B49/00
Inventor 蒋廷学吴峙颖曾义金刘建坤吴春方眭世元贾文峰肖博
Owner CHINA PETROLEUM & CHEM CORP
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