Method for promoting balanced expansion of multiple clusters of fractures through ball throwing temporary plugging

A balanced and temporary plugging ball technology, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problem that there is no effective way to ensure the balanced expansion and extension of multi-cluster fractures, so as to reduce the unit oil and gas production cost, The effect of enhancing oil and gas recovery and increasing the volume of reservoir stimulation

Active Publication Date: 2020-09-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there is no effective method to ensure the balanced expansion and extension of multi-cluster fractures

Method used

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  • Method for promoting balanced expansion of multiple clusters of fractures through ball throwing temporary plugging
  • Method for promoting balanced expansion of multiple clusters of fractures through ball throwing temporary plugging
  • Method for promoting balanced expansion of multiple clusters of fractures through ball throwing temporary plugging

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Experimental program
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Effect test

specific Embodiment 1

[0035] The method provided in this embodiment to promote the balanced expansion of multiple clusters of fractures by temporarily plugging balls includes the following steps:

[0036] 1) Divide the horizontal section of a shale gas horizontal well into 15 sections.

[0037] 2) Divide the entire fracturing construction process of each fracturing section into two levels.

[0038] 3) Implement the first stage of fracturing, including the second stage of fracturing. Implement the first stage of fracturing, specifically including: ① inject a certain 10m into the wellbore 3 Acid liquid; ② Immediately inject 80m into the wellbore 3 Glue; ③Further inject drag-reducing water into the wellbore, then add proppant with different particle sizes, first add 70 / 140 mesh proppant for 15m 3 , then add 40 / 70 mesh proppant 40m 3 , and finally add 30 / 50 mesh proppant 5m 3 , the accumulative injection volume of drag reducing water is 800m 3 .

[0039] 4) Implement the second stage of fracturi...

specific Embodiment 2

[0043] The method provided in this embodiment to promote the balanced expansion of multiple clusters of fractures by temporarily plugging balls includes the following steps:

[0044] 1) Divide the horizontal section of a shale gas horizontal well into 20 sections.

[0045] 2) Divide the entire fracturing construction process of each fracturing section into three levels.

[0046] 3) Implement the first stage of fracturing, including three stages of fracturing. The first stage of fracturing specifically includes: ① injecting a certain amount of 20m into the wellbore 3 Acid liquid; ② Immediately inject 150m into the wellbore 3 Glue; ③Further inject drag-reducing water into the wellbore, then add proppant with different particle sizes, first add 12m of 70 / 140 mesh proppant 3 , then add 40 / 70 mesh proppant 30m 3 , finally add 30 / 50 mesh proppant 3m 3 , the accumulative injection volume of drag reducing water is 1200m 3 .

[0047] 4) Implement the second stage of fracturing, co...

specific Embodiment 3

[0052] The method provided in this embodiment to promote the balanced expansion of multiple clusters of fractures by temporarily plugging balls includes the following steps:

[0053] 1) Divide the horizontal section of a shale gas horizontal well into 18 sections.

[0054] 2) Divide the entire fracturing construction process of each fracturing section into two levels.

[0055] 3) Implement the first stage of fracturing, including the second stage of fracturing. Implement the first stage of fracturing, including: ① inject a certain amount of 30m into the wellbore 3 Acid liquid; ② Immediately inject 200m into the wellbore 3 Glue; ③Further inject drag-reducing water into the wellbore, then add proppant with different particle sizes, first add 20m of 70 / 140 mesh proppant 3 , then add 40 / 70 mesh proppant 45m 3 , finally add 30 / 50 mesh proppant 3m 3 , the accumulative injection volume of drag reducing water is 1300m 3 .

[0056] 4) Implement the second stage of fracturing, co...

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Abstract

The invention discloses a method for promoting balanced expansion of multiple clusters of fractures through ball throwing temporary plugging. The method comprises the following steps that the whole fracturing construction process of one fracturing section is divided into N stages, and first-stage fracturing is implemented, wherein different types of combined fracturing fluids capable of promotingcrack initiation and expansion are injected into a wellbore; second-stage fracturing is implemented, wherein fracturing fluids are injected continuously, degradable temporary plugging balls are put into the wellbore to be used for temporarily plugging holes of perforation clusters to limit expansion of dominant hydraulic fractures, and fracturing fluids are injected continuously to promote expansion of non-dominant fractures; the subsequent several stages of fracturing construction processes are performed similar to the second-stage fracturing construction process until the construction of thefracturing section is completed; and subsequent construction of other fracturing sections is completed according to the above process, and finally balanced fracturing transformation of the whole horizontal section reservoir is realized. According to the method, the unbalanced expansion phenomenon of multi-cluster fractures can effectively relieved, the reservoir transformation volume is increased, the oil and gas recovery ratio is increased, and the method is widely suitable for various reservoir types.

Description

technical field [0001] The invention relates to the research field of oil and gas reservoir development technology, in particular to a method for promoting the balanced expansion of multi-cluster fractures by throwing balls for temporary plugging. Background technique [0002] In recent years, unconventional natural gas resources such as shale gas and tight sandstone gas have gradually entered the stage of large-scale commercial development. Due to the tightness of such reservoirs and low permeability, oil and gas cannot spontaneously flow into the wellbore from rock pores. At present, horizontal drilling and segmental Multi-cluster fracturing technology is the most effective development method. [0003] Horizontal drilling means that the wellbore trajectory travels horizontally inside the reservoir. Compared with vertical wells, horizontal wells can maximize the contact area between the wellbore and the reservoir. [0004] Staged multi-cluster fracturing technology is a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B33/13E21B43/27E21B43/267
CPCE21B43/26E21B33/13E21B43/261E21B43/267
Inventor 郭洪金肖佳林刘炜李奎东张炜明月王升
Owner CHINA PETROLEUM & CHEM CORP
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