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Slim hole continuous separate layer fracturing method and fracturing string

A technology of layered fracturing and wellbore, which is used in wellbore/well components, earthwork drilling and production, and fluid production, etc., to achieve the effect of improving single well production, improving efficiency and simple process

Pending Publication Date: 2021-10-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a slim hole continuous layered fracturing method and a fracturing string to solve the problem of sequential fracturing of two sets of different lithology reservoirs in a slim hole

Method used

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  • Slim hole continuous separate layer fracturing method and fracturing string
  • Slim hole continuous separate layer fracturing method and fracturing string
  • Slim hole continuous separate layer fracturing method and fracturing string

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Embodiment approach 1

[0032] Such as Figure 1 to Figure 3 As shown, the present invention provides a continuous layered fracturing method for slim holes, which can carry out continuous layered fracturing for the first reservoir 1 and the second reservoir 2 with different lithologies. The method includes the following steps:

[0033] Step S1: Acid fracturing the first reservoir 1, mixing the acid liquid and the first fracturing fluid at the position corresponding to the first reservoir 1 in the well, forming acid fracturing fluid and injecting the first reservoir layer 1;

[0034] Step S2: hydraulically fracturing the second reservoir 2, setting the oil casing annulus 3 between the first reservoir 1 and the second reservoir 2, corresponding to the second reservoir 2 in the well position, inject a second fracturing fluid into the second reservoir 2 .

[0035] The slim hole continuous layered fracturing method of the present invention can solve the problem of sequentially fracturing two sets of di...

Embodiment approach 2

[0055] Such as figure 2 and image 3 As shown, the present invention also provides a slim-hole continuous layered fracturing string 6, which includes an injector 61, a balance valve 62, a packer 63, an anchor 64, and a guiding centralizer that are sequentially connected to the coiled tubing 4 65. Wherein, the ejector 61 and the coiled tubing 4 are connected by a hands-off joint 66 , and a positioner 67 is connected between the anchor 64 and the guide centralizer 65 . Further, a slip-type connector is connected between the coiled tubing 4 and the hands-off joint 66 .

[0056] The slim hole continuous layered fracturing string 6 of the present invention can solve the problem of sequentially fracturing two sets of different lithology reservoirs in a slim hole and realize the integration of different lithology reservoirs under the condition of a slim hole The application of transformation technology scale.

[0057] Taking the injection of acid liquid into the coiled tubing 4 ...

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Abstract

The invention provides a slim hole continuous separate layer fracturing method and a fracturing string. The slim hole continuous separate layer fracturing method can perform continuous separate layer fracturing transformation on a first reservoir and a second reservoir which are different in lithology, and the slim hole continuous separate layer fracturing method comprises the following steps that S1, the first reservoir is subjected to acid fracturing transformation, acid liquid and first fracturing liquid are mixed at the position, corresponding to the first reservoir, in a well, and after acid fracturing liquid is formed, the acid fracturing liquid is injected into the first reservoir; and S2, the second reservoir is transformed through hydraulic fracturing, an oil sleeve annulus between the first reservoir and the second reservoir is subjected to setting, and second fracturing fluid is injected into the second reservoir at the position, corresponding to the second reservoir, in the well. According to the slim hole continuous separate layer fracturing method and the fracturing string, the problem that two sets of different lithologic reservoirs are sequentially fractured and transformed through the slim-hole one-time string can be solved.

Description

technical field [0001] The invention relates to the technical field of oil and gas production engineering, in particular to a slim hole continuous layered fracturing method and a fracturing pipe string. Background technique [0002] The integrated technology of drilling, fracturing and gas production under the condition of slim hole wellbore structure is one of the effective means to reduce costs and increase efficiency in the development of oil and gas reservoirs at home and abroad, and realize the cost economic optimization of the whole life cycle of gas wells. In recent years, under the long-term oil price situation, the superiority of the large-scale application of slimhole drilling, fracturing and gas production integrated technology has become more prominent. [0003] At present, in the ancient reservoirs of Changqing Oilfield, the integrated technology of slimhole drilling, fracturing and gas production has been applied on a large scale. However, the Changqing gas fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/27E21B43/114E21B43/14
CPCE21B43/26E21B43/114E21B43/14
Inventor 李宪文付金华慕立俊韩巧荣张燕明周长静马占国肖元相问晓勇古永红白建文史华刘静高伟
Owner PETROCHINA CO LTD