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Temporary plugging agent for multistage fracturing of shale gas as well as bridge-plug-free fracturing method and device

A temporary plugging agent, shale gas technology, applied in chemical instruments and methods, earthwork drilling, and fluid production, etc., to achieve good plugging effect and prolong temporary plugging time.

Inactive Publication Date: 2016-11-23
江汉油田科瑞德石油工程技术(武汉)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current stage of hydraulic multi-stage fracturing construction, the usual process is to use bridge plugs to complete the classification, and the workload of lowering the bridge plugs and drilling and grinding of the bridge plugs results in unnecessary costs and construction time

Method used

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  • Temporary plugging agent for multistage fracturing of shale gas as well as bridge-plug-free fracturing method and device
  • Temporary plugging agent for multistage fracturing of shale gas as well as bridge-plug-free fracturing method and device

Examples

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Embodiment 1

[0064] Embodiment 1: The temporary plugging agent of the embodiment of the present invention includes: 90 parts by weight of carrier fluid, 2.0 parts by weight of degradable polyester fiber, 30 parts by weight of proppant, and 0.45 parts by weight of linear glue. Wherein, the fiber length > 10mm, the carrier liquid includes: 0.2-0.6 parts by weight of guar gum, 0.1-0.5 parts by weight of bactericide, 0.3-0.7 parts by weight of a stabilizer, 0.3-0.8 parts by weight of a drainage aid, and 0.1 to 0.5 parts by weight of sodium carbonate.

Embodiment 2

[0065] Embodiment 2: The temporary plugging agent of the embodiment of the present invention includes: 95 parts by weight of carrier fluid, 2.5 parts by weight of degradable polyester fiber, 35 parts by weight of proppant, and 0.45 parts by weight of linear glue. Wherein, the fiber length>5mm, the carrier fluid includes: 0.2-0.6 parts by weight of guar gum, 0.1-0.5 parts by weight of bactericide, 0.3-0.7 parts by weight of a stabilizer, 0.3-0.8 parts by weight of a drainage aid, and 0.1 to 0.5 parts by weight of sodium carbonate.

Embodiment 3

[0066] Embodiment 3: The temporary plugging agent of the embodiment of the present invention includes: 92 parts by weight of carrier fluid, 3.0 parts by weight of degradable polyester fiber, 25 parts by weight of proppant, and 0.5 parts by weight of linear glue. Wherein, the fiber length is 5 mm to 10 mm, and the carrier fluid includes: 0.2 to 0.6 parts by weight of guar gum, 0.1 to 0.5 parts by weight of a fungicide, 0.3 to 0.7 parts by weight of a stabilizer, 0.3 to 0.8 parts by weight of a drainage aid, and 0.1 to 0.5 parts by weight of sodium carbonate.

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Abstract

The invention relates to the technical field of oil and gas engineering, in particular to a temporary plugging agent for multistage fracturing of shale gas and an application. A high-density spatial network structure is formed by soluble fibers in the temporary plugging agent provided by an embodiment, the temporary plugging time is prolonged effectively and controllably, and a bridge plug is replaced; the plugging effect is good, unplugging is performed automatically after fracturing and acidification, and no damage is caused to a reservoir. According to a method provided by the embodiment, the temporary plugging agent is used for controlled temporary plugging after primary fracturing, after the bottom hole pressure is increased, a non-transformed new stratum is opened, a new crack is opened, so that dynamic classification is realized, and the bridge plug is not needed.

Description

technical field [0001] The application relates to the technical field of oil and gas engineering, in particular to a temporary plugging agent for multi-stage fracturing of shale gas and its application. Background technique [0002] At present, the exploitation of shale gas mainly takes the form of hydraulic multi-stage fracturing. Multi-stage fracturing can improve the efficiency of hydraulic fracturing, reduce the use of water and reduce man-hours. Between hydraulic fracturing stages, bridge plugs are usually used to space each fracturing stage. After each stage of fracturing perforation is completed, coiled tubing is used to drill off the bridge plug to connect the entire wellbore to achieve gas production conditions. [0003] In the current stage of hydraulic multi-stage fracturing construction, the usual process is to use bridge plugs to complete the classification, and the workload of lowering bridge plugs and drilling and grinding of bridge plugs has resulted in unne...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B43/26E21B43/116C09K8/50
CPCE21B33/13C09K8/50E21B43/116E21B43/261
Inventor 卓丹
Owner 江汉油田科瑞德石油工程技术(武汉)有限公司
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