A fracturing method for increasing fracture height during multi-cluster perforation of shale gas

A shale gas and shower technology, 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, so as to achieve the effects of excavating the production potential of the reservoir, increasing the height of the fracture, and ensuring the effect of increasing production.

Active Publication Date: 2022-03-08
CHINA PETROLEUM & CHEM CORP +1
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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 the fracture height during multi-cluster perforation of shale gas. Including: (1) evaluation of key shale parameters (2) comprehensive sweet spot calculation and segment cluster location determination (3) optimization of fracture parameters (4) optimization of fracturing operation parameters (5) joint construction of bridge plug and perforation (6) Acid pretreatment (7) High-viscosity and high-displacement fracture construction (8) Low-viscosity slick water to continue fracture construction (9) Low-viscosity fracturing fluid continuous sanding construction (10) Medium-viscosity fracturing fluid Displacement removal of the fracture channel partially blocked by proppant in step (9) (11) medium-viscosity slick water carrying medium-density 70-140 mesh proppant for construction (12) medium-viscosity slick water carrying medium-density 40-70 mesh proppant for construction (13) Medium-viscosity glue carries medium-density 30-50 mesh proppant for construction. The invention can increase the volume of fracture reconstruction, the effect of increasing production is more obvious, and the production potential of shale gas reservoirs can be better tapped.

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 Patents(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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