A method for refracturing horizontal wells

A technology for refracturing and horizontal wells, which is applied in earthwork drilling, wellbore/well components, and production fluids, etc. It can solve the problem of targeted reduction of refracturing parameters, poor pertinence of fracturing construction parameters, and difficulty in accurately calculating superposition effects To achieve the effect of improving the construction effect, clarifying the method, and increasing the reconstruction volume

Active Publication Date: 2021-10-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also a method of using double packers and single card, but due to the limited inner diameter of the pipe string, the fracturing displacement is limited
[0008] 2) The pertinence of fracturing parameters is poor
Considering that the induced stress produced by the first fracture will not completely disappear until the fracture is closed, and the double superimposed effect of the induced stress caused by production, and this superimposed effect is difficult to calculate accurately, the fracture initiation direction and cause of refracturing The impact of large fluid loss on construction parameters is uncertain, so the pertinence of refracturing parameters is greatly reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Well A of a shale gas well has a vertical depth of 2320m and a horizontal section length of 1500m. There are 18 sections in the first fracturing. The repeated fracturing steps include:

[0063] Step 1: Reservoir evaluation of well A before repeated fracturing. Based on the construction parameters and pressure curves of the first fracturing, the analysis of production dynamic characteristics after fracturing and various test data (pressure recovery test, gas production profile test, etc.), the formation pressure, the magnitude and direction of the in-situ stress, and the effective Permeability, formation comprehensive filtration coefficient and changes in rock mechanics parameters are used in the design of construction schemes; geological modeling software such as PETROL and ECLIPSE are used to analyze the production situation of the reservoir around the first fracturing fracture and the adjacent two The distribution of reserves among perforation clusters is studied.

...

Embodiment 2

[0074] Well B of a shale gas well has a vertical depth of 2100m and a horizontal section length of 1380m. There are 15 sections in the first fracturing. The repeated fracturing steps include:

[0075] Step 1: Reservoir evaluation of Well B before repeated fracturing. Based on the construction parameters and pressure curves of the first fracturing, the analysis of production dynamic characteristics after fracturing and various test data (pressure recovery test, gas production profile test, etc.), the formation pressure, the magnitude and direction of the in-situ stress, and the effective Permeability, formation comprehensive filtration coefficient and changes in rock mechanics parameters are used in the design of construction schemes; geological modeling software such as PETROL and ECLIPSE are used to analyze the production situation of the reservoir around the first fracturing fracture and the adjacent two The distribution of reserves among perforation clusters is studied.

[0...

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PUM

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Abstract

The invention discloses a method for repeated fracturing of a horizontal well. Including: step (1) parameter evaluation and optimization before repeating fracturing; step (2) repeating fracturing along old fractures or injecting new holes between original old fractures; step (3) slippery water and carbon dioxide foam fracturing fluid Formula optimization and preparation; step (4) injecting slick water carbon dioxide foam fracturing fluid for fracturing or extending the main fracture; step (5) proppant injection construction; step (6) displacement operation; step (7) repeating step (4) ~ Step (6), until the construction is completed. The invention greatly increases the stimulation effect of repeated fracturing in shale gas reservoirs, and the optimization result can effectively guide the construction of repeated fracturing, greatly increase the volume of stimulation, and obviously improve the operation effect, thereby obtaining the greatest economic benefits.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, and furthermore, relates to a method for repeated fracturing of a horizontal well. Background technique [0002] At present, whether it is shale, sandstone or carbonate rock, the problem of refracturing horizontal wells is becoming more and more urgent. After a certain period of time after the first fracturing, the conductivity of the fracture will decrease continuously and even reach 0, and the volume of the original fracture structure will also gradually decrease, resulting in a decrease in production. After the production is lower than the economic limit, it is necessary to consider refracturing to restore or increase the production of the well and realize economical and effective development. Especially under the current low oil price conditions, through repeated fracturing of horizontal wells, the oil and gas area not affected by the original fractures can be continued to expand, o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/26E21B43/267
Inventor 蒋廷学肖博曾义金卞晓冰李双明刘建坤吴峙颖吴春方陈晨
Owner CHINA PETROLEUM & CHEM CORP
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