Fracturing method for increasing fracture forming height during shale gas multi-cluster perforation

A shale gas and shower technology, which is applied in the field of oil and gas field exploration and development, can solve the problems of difficulty in the growth of fracture height and increase in the volume of fracture stimulation, and achieve the effects of obvious production stimulation effect, mining production potential, and good production potential.

Active Publication Date: 2020-06-19
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem that the height of the fractures is difficult to increase when multi-cluster perforation is performed in the shale gas fracturing section, which leads to the difficulty in increasing the volume of fracture stimulation, and proposes a fracturing method for increasing the height of fracture creation during multi-cluster perforation of shale gas method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Well X in the unconventional shale gas block was completed using staged horizontal well fracturing technology.

[0091] Proceed as follows:

[0092] (1) Evaluate key shale parameters.

[0093] Using methods such as seismic, well logging, mud logging, testing, and core laboratory experiments, the vertical and horizontal distribution characteristics, lithology, various mineral composition characteristics, sensitivity characteristics, physical properties, rock mechanical parameters, and Three-dimensional in-situ stress characteristics, horizontal bedding fractures and high-angle natural fracture characteristics, temperature and pressure, and underground fluid property parameters were tested and analyzed.

[0094] (2) Calculate the geological sweet spots and engineering sweet spots on the horizontal section on the basis of step (1), and calculate the distribution of comprehensive sweet spot indicators along the horizontal wellbore by the equal weight method. According to ...

Embodiment 2

[0120] Well Y, a shale gas well, was completed using staged horizontal well fracturing technology.

[0121] Proceed as follows:

[0122] (1) Evaluate key shale parameters.

[0123] Using methods such as seismic, well logging, mud logging, testing, and core laboratory experiments, the vertical and horizontal distribution characteristics, lithology, various mineral composition characteristics, sensitivity characteristics, physical properties, rock mechanical parameters, and Three-dimensional in-situ stress characteristics, horizontal bedding fractures and high-angle natural fracture characteristics, temperature and pressure, and underground fluid property parameters were tested and analyzed.

[0124] (2) Calculate the geological sweet spots and engineering sweet spots on the horizontal section on the basis of step (1), and calculate the distribution of comprehensive sweet spot indicators along the horizontal wellbore by the equal weight method. According to the cementing quali...

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Abstract

The invention discloses a fracturing method for increasing fracture forming height during shale gas multi-cluster perforation. The method comprises the steps of (1) evaluating key shale parameters; (2) calculating comprehensive sweet spots and determining the position of a segment cluster; (3) optimizing fracture parameters; (4) optimizing fracturing construction parameters; (5) carrying out bridge plug and perforation combined operation construction; (6) carrying out acid pretreatment operation; (7) carrying out high-viscosity and high-displacement fracture forming construction; (8) carryingout low-viscosity slick water continuous fracture forming construction; (9) carrying out low-viscosity fracturing fluid continuous sand adding construction; (10) removing the medium displacement of the viscosity fracturing fluid in the step (9) to remove the fracture channel partially blocked by the propping agent in the step (9); (11) carrying out medium-density 70-140-mesh propping agent construction by the viscosity slick water; (12) carrying out medium-density 40-70-mesh propping agent construction by the viscosity slick water; and (13) carrying out medium-density 30-50-mesh propping agentconstruction by the viscosity glue solution. According to the method, the fracture transformation volume can be improved, the yield increasing effect is more obvious, and the production potential ofthe shale gas reservoir is better excavated.

Description

technical field [0001] The invention relates to the technical field of exploration and development of oil and gas fields, and more specifically, relates to a fracturing method for increasing the height of fracture creation during multi-cluster perforation of shale gas. Background technique [0002] At present, for shale with high brittleness, the method of multi-cluster perforation in a section is generally adopted, from 2-3 clusters commonly used in the past to 3-4 clusters or even 3-6 clusters. However, after the number of clusters increases significantly, the displacement generally does not increase. Therefore, a large decrease in the displacement of a single cluster of perforations will inevitably lead to a decrease in the height of fracture creation, and a decrease in the height of fracture creation will inevitably lead to effective reconstruction of fractures. Therefore, the increase in the number of clusters in the segment originally hoped to increase the volume of fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B43/27E21B43/116
CPCE21B43/267E21B43/116
Inventor 蒋廷学刘斌彦刘红磊李洪春周珺侯磊周林波
Owner CHINA PETROLEUM & CHEM CORP
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