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Fracturing method for improving complexity of deep shale gas cracks

A complex, shale gas technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc.

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

It is beneficial to improve the complexity of deep shale gas fracturing fractures and the effective stimulation volume

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0085] Well A has a vertical depth of 3598m, a measured depth of 4823m, and a horizontal section length of 1260m.

[0086] The steps and results are as follows:

[0087] (1) Evaluation of key parameters of shale reservoirs

[0088] Using methods such as well logging, mud logging, core laboratory experiments, and inversion of fracturing construction parameters in adjacent wells, the lithology and mineral components, sensitivity, physical properties, rock mechanics, three-dimensional in-situ stress, and horizontal bedding / texture fractures were analyzed. and high-angle natural fracture development characteristics to obtain effective information for fracturing design.

[0089] (2) Position determination of cluster perforation

[0090] On the basis of the evaluation in step (1), combined with the geological sweet spot and engineering sweet spot evaluation index, the location of geological engineering double sweet spot is selected as the preferred location of cluster perforation; t...

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Abstract

The invention discloses a fracturing method for improving complexity of deep shale gas cracks. According to the fracturing method for improving the complexity of the deep shale gas cracks, the mode ofa prepositioned high-viscosity glue solution and low-viscosity quick water and a high-viscosity glue solution is adopted, propping agents of 140-230 meshes and 70-140 meshes are used for filling andsaturating the cracks with various sizes, and the complexity of the deep shale gas fracturing cracks is improved and the effective transforming volume is increased. According to the fracturing methodfor improving the complexity of the deep shale gas cracks, liquid performance parameters, crack parameters and corresponding construction parameters are determined by using fracturing earlier stage optimal design, the mode of the prepositioned high-viscosity glue solution and the low-viscosity quick water and the high-viscosity glue solution is adopted, an optimization rapid and synchronous gel breaking technology is used, the propping agents of the 140-230 meshes and 70-140 meshes are used, finally, the complexity of the deep shale gas fracturing cracks is improved and the effective transforming volume is increased, and increased production and stable yield of a shale gas well are facilitated.

Description

technical field [0001] The invention relates to the technical field of exploration and drilling, and furthermore, relates to a fracturing method for increasing the complexity of deep shale gas fractures. Background technique [0002] At present, the conventional deep shale gas fracturing model basically refers to the medium and shallow shale gas fracturing model, and often adopts the mode of acid pretreatment + slick water + glue (the proportion of glue is small, or even no glue). Most of the fractures formed are complex fractures near the wellbore, because low-viscosity slick water helps to communicate and extend various small and micro-scale fracture systems, even under high displacement, it is difficult to quickly and effectively increase the net pressure in the main fractures Ascension, the final main crack is difficult to meet the design requirements. The low-viscosity slick water has weak sand-carrying ability, and the proportion of sand settling in the cracks is rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B43/27E21B43/11
CPCE21B43/11E21B43/26E21B43/267
Inventor 蒋廷学曾义金左罗王海涛卞晓冰李双明肖博
Owner CHINA PETROLEUM & CHEM CORP
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