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A volumetric fracturing method for activating natural fractures on a large scale

A natural fracture and volume fracturing technology, which is applied in the field of oil drilling, can solve the problems that the expected effect of volume fracturing is not achieved, and the complexity of fractures is not high enough, so as to achieve the effect of increasing complexity, transforming volume and increasing net pressure

Active Publication Date: 2021-11-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has a certain effect on activating natural fractures at all levels, the current fracture monitoring results show that the probability of complex fractures in horizontal well staged fracturing is only about 50%, and about half of the fractures are single fractures
Even in complex fractures, the degree of complexity of the fractures is not high enough to achieve the expected effect of volume fracturing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] For a shale gas well, the steps and results are as follows:

[0092] 1. Firstly, the key reservoir parameters of the well were evaluated based on geological, seismic and logging data, and the locations of geological engineering sweet spots and segment clusters were determined.

[0093] 2. Using ECLIPSE and MEYER software to optimize the fracturing fracture length, fracturing scale and number of fracturing stages, etc., according to the optimization results, the fracturing stage is divided into 18 stages, and the amount of fracturing fluid in a single stage is 1800m 3 , a single-stage propping dose of 70m 3 .

[0094] 3. According to the specific implementation step 6 in the invention, the acid type and formula are optimized, and injected according to the corresponding displacement.

[0095] 4, adopt the low-viscosity slippery water of viscosity 1.5mPa.s, liquid volume generally accounts for 25% of the total liquid volume that the invention implements step 4) optimizes, ...

Embodiment 2

[0108] For a shale gas well, the steps and results are as follows:

[0109] 1. Firstly, the key reservoir parameters of the well were evaluated based on geological, seismic and logging data, and the locations of geological engineering sweet spots and segment clusters were determined.

[0110] 2. Using ECLIPSE and MEYER software to optimize the fracturing fracture length, fracturing scale and number of fracturing stages, etc., according to the optimization results, the fracturing stage is divided into 18 stages, and the amount of fracturing fluid in a single stage is 1800m 3 , the propping dose of a single section is 65m 3 .

[0111] 3. According to the specific implementation step 6 in the invention, the acid type and formula are optimized, and injected according to the corresponding displacement.

[0112] 4, adopt the low-viscosity slippery water of viscosity 1.5mPa.s, liquid quantity generally accounts for 30% of the total liquid quantity that the invention implements step...

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Abstract

The invention discloses a volume fracturing method for activating natural fractures in a large range. Including: step (1) parameter evaluation and optimization; step (2) joint perforation operation under bridge plug; step (3) acid pretreatment operation; step (4) joint construction in low-viscosity slick water or acid slick water; (5) Construction of mixing proppant and sand to plug main cracks; step (6) construction of step-up displacement; step (7) mixed injection construction of 140-210 mesh proppant and 70-140 mesh proppant; step (8) high-viscosity construction The fracturing fluid does not add sand to flush the main fracture construction; step (9) the second and third main fracture plugging and subsequent construction; repeat steps 5) to 8); then, repeat steps 5) to 7); step ( 10) Adding sand to the main fracture with high-viscosity fracturing fluid; step (11) replacement operation. The invention can increase the complexity of fractures and the volume of stimulation during reservoir stimulation, thereby realizing high-efficiency production increase of shale gas wells.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a volume fracturing method for activating natural fractures in a large area. Background technique [0002] At present, volume fracturing technology is widely used in various types of oil and gas reservoirs such as shale, carbonate rock (volume acid fracturing instead of volume fracturing), and sandstone. The so-called volume fracturing is based on the staged fracturing of horizontal wells or layered fracturing of vertical wells, which greatly increases the complexity of fractures, thereby forming a criss-cross fracture network and ensuring that there are no seepage dead zones within the fracture sweep range. exist. The key here is to use hydraulic action to activate a large number of natural fractures, otherwise, the complexity of the fractures will be difficult to increase significantly. [0003] Chinese patent CN106545324A discloses a method for opening multiple ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267
CPCE21B43/267
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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