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Horizontal well segmented refracturing method and application thereof

A technology for repeated fracturing and horizontal wells, which is applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc. It can solve the problems of difficult re-transformation of horizontal wellbore, etc., so as to improve construction effect, improve flow followability, well-designed effects

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

AI Technical Summary

Problems solved by technology

Therefore, the temporary plugging and refracturing process still has the serious limitation that it is difficult to re-stimulate the fractures from the middle to the toe of the horizontal wellbore.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0052] 2) Preparation of liquid rubber plug for temporary plugging of horizontal wellbore

[0053] Proceed to the preparation of liquid rubber stoppers. Among them, the experimental test of the pressure bearing strength can use steel pipes with the same diameter as the actual casing in the laboratory to simulate the pressure difference under different rubber plug lengths. When under pressure, the displacement speed of the liquid rubber plug in the horizontal wellbore is required to be less than 3cm / min.

[0054] 3) Injection of the first liquid rubber stopper

[0055] Get the liquid rubber stopper that step 2) prepares, prepare to be filled with the amount of 20m length casing volume 0.24m 3 , the displacement of injected liquid rubber plug is 0.2-0.5m 3 / min, and the viscosity of the fracturing fluid replacing the liquid rubber plug should be 80-100mPa.s to achieve the effect of piston propulsion. In order to improve the construction efficiency, the displacement of the f...

Embodiment 1

[0066] The present invention is applied in the repeated fracturing construction of well A in the southern Sichuan area. The vertical depth of the well is 2200m, the horizontal section is 1500m long, and 16 sections are initially fractured. Through the method provided by the present invention, the wellbore is divided into five sections for repeated fracturing, each section is 300m long. Specific steps are as follows:

[0067] 1) Based on laboratory test, numerical simulation and history matching results, various parameters before repeated fracturing are obtained, mainly formation parameters and initial fracturing fracture parameters (fracture length, fracture height, fracture width, etc.).

[0068] 2) To prepare temporary plugging liquid rubber plug, 8wt% acrylamide, 0.06wt% organic titanium cross-linking agent (purchased from Xinxiang Xuantai Industrial Co., Ltd.), 0.02wt% supernatant Benzoyl oxide, 2.0wt% capsule gel breaker (the inner core of which is coated with ammonium p...

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Abstract

The invention relates to a horizontal well segmented refracturing method and application thereof. The horizontal well segmented refracturing method comprises the steps that S1, a horizontal well is divided into multiple segments from the heel to the toe; S2, a first well segment of the horizontal well is separated from other well segments of the horizontal well through a liquid rubber plug; and S3, fracturing transformation is conducted on the first well segment of the horizontal well. According to the method provided by the invention, the advantages of high viscosity and high strength of theliquid rubber plug are brought into full play, the liquid rubber plug is used for plugging part of a wellbore segment by segment, then a temporary plugging agent is used for temporary plugging refracturing, segmented refracturing is achieved on the whole, and the refracturing pertinence is improved; and meanwhile, the defect of large uncertainty of temporary plugging refracturing transformation ofthe whole wellbore is overcome, through an optimization result, refracturing construction can be effectively guided, the transformation size is increased, the construction effect is improved, and therefore the maximum economic benefits are obtained.

Description

technical field [0001] The invention belongs to the field of oil field exploitation, and in particular relates to a segmented repeated fracturing method for a horizontal well and an application thereof. Background technique [0002] At present, horizontal well staged fracturing technology has been widely used in tight sandstone, shale and carbonate rock oil and gas reservoirs. It has been greatly improved, so the input-output ratio is generally increased by more than 1-3 times. However, similar to vertical well fracturing, horizontal wells also face the problem of failure after staged fracturing, that is, the output after fracturing decreases year by year, and even has no economic development benefits. Therefore, the refracturing technology of horizontal wells has been put on the agenda and is becoming more and more urgent. [0003] At present, there are two main types of refracturing technology for horizontal wells. One is single-sealed and double-clamped pipe strings. Al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B33/13E21B49/00C09K8/66C09K8/80C09K8/512
CPCE21B43/26E21B43/267E21B33/13E21B49/00C09K8/665C09K8/80C09K8/512
Inventor 蒋廷学肖博魏娟明王海涛李双明卞晓冰卫然苏瑗左罗仲冠宇
Owner CHINA PETROLEUM & CHEM CORP
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