Shale gas horizontal well refracturing method

A technology for repeated fracturing and horizontal wells, which is applied in the direction of earthwork drilling, wellbore/well components, production fluids, etc., and can solve the problem that repeated fracturing intervals cannot be accurately controlled, and the fracturing intervals and fracturing fluids cannot be accurately known. The problem of uncontrolled flow direction can be solved to achieve the effect of improving effectiveness and accuracy, easy control of liquid flow direction, and improving the success rate of fracturing

Active Publication Date: 2022-04-22
北京科源博慧技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above repeated fracturing technology, when the temporary plugging ball or temporary plugging agent is added, due to the poor followability of the temporary plugging ball or temporary plugging agent in the liquid, the liquid inlet channel may not be blocked, resulting in liquid inflow The channel is over-reformed, and some fractures are over-extended, while other areas are not effectively restructured, resulting in poor sealing of the original fractures in the reconstructed wellbore, so that when re-fracturing, the pumped fracturing The direction of fluid flow is uncontrolled, and the ground cannot accurately know the fracturing interval. That is to say, due to insufficient sealing performance, it is impossible to accurately control the new repeated fracturing interval, which leads to blindness in fracturing construction and is difficult to maximize. Repeated transformation of the reservoir

Method used

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  • Shale gas horizontal well refracturing method
  • Shale gas horizontal well refracturing method
  • Shale gas horizontal well refracturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: A refracturing method for horizontal shale gas wells, which can effectively guide the refracturing construction of shale gas horizontal wells. The structure of the pipe string can cooperate with the implementation of the refracturing process, ensuring that the pipe string is Under the premise of the largest diameter, realize large displacement fracturing, greatly improve the refracturing of the reservoir, and maximize economic benefits. like Figure 1 to Figure 3 As shown, the horizontal well in this embodiment is a 1HF well with a depth of 5417m, a horizontal section length of 1750m, and 20 stages of primary fracturing. The casing specification is 139.7mm, and the inner diameter is 115.3mm. In the string structure, 10 stages of refracturing were implemented. The specification of refracturing casing 3 is 101.6mm, and the internal diameter is 80.2mm. It is a casing without coupling. The steps are as follows:

[0036] S1. After evaluating the horizontal wells ...

Embodiment 2

[0046] Embodiment 2: The difference between this embodiment and Embodiment 1 is that after the refracturing casing 3 is lowered into the primary fracturing casing 1, when the refracturing section 4 is refractured, the initial fracturing is synchronously fired. The casing at the location of the fracturing interval, and then after the full diameter of the wellbore, can realize the joint production of the initial fracturing interval and the re-fracturing interval 4, greatly improving the single well production and production cycle.

Embodiment 3

[0047] Embodiment 3: The difference between this embodiment and Embodiment 1 is that, after the plugging in step S5, the liquid with a concentration of 6% KCl brine is used for circulating transportation to expand the packer 5. The material It is low in cost and non-toxic, can improve the expansion effect of the packer 5, and avoid affecting the plugging effect of the degradable polymer temporarily plugging the primary perforation hole, thereby ensuring the gap between the refracturing interval 4 and the primary perforation hole. Partition tightness.

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Abstract

The invention discloses a shale gas horizontal well refracturing method, which relates to the technical field of refracturing, and is characterized by comprising the following steps: S1, preparing a refracturing sleeve, and arranging packers at two ends of a refracturing interval; s2, the repeated fracturing casing pipe is put into a shaft; s3, plugging is conducted, temporary plugging liquid is conveyed in a circulating mode, temporary plugging is conducted on primary fracturing, the packer is plugged after temporary plugging, and reconstruction of the re-fracturing shaft is completed; and S4, re-fracturing is carried out, and re-fracturing is carried out on the re-fractured interval so as to generate a new crack. According to the method, the sealing performance of plugging of the primary perforation hole can be improved, the shale gas production shaft is reconstructed through the refracturing sleeve, the fracturing success rate is increased, refracturing cracks of all sections are independently treated, the effectiveness and accuracy of refracturing transformation are improved, the flowing direction of fracturing fluid is predicted more accurately, crack expansion is controlled more accurately, and the fracturing efficiency is improved. And the reservoir transformation volume is increased to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of shale gas horizontal well fracturing, more specifically, it relates to a method for repeated fracturing of shale gas horizontal wells. Background technique [0002] Shale gas refers to unconventional natural gas deposited in organic-rich shale-dominated reservoir rock series, and is continuously generated biochemical or thermogenic gas or a mixture of the two. Shale gas acquisition is usually Using horizontal wells for fracturing to excavate shale gas in shale reservoirs. After a certain period of time after the first fracturing, the fractures close and the conductivity decreases step by step, resulting in a decrease in production. Repeated fracturing is required to restore or increase productivity. The traditional shale gas refracturing method basically adopts temporary plugging and refracturing technology, such as authorized announcement number or application publication number CN110761763B, CN11092491...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B33/127
CPCE21B43/26E21B33/127
Inventor 高忠民
Owner 北京科源博慧技术发展有限公司
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