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Open hole packer staged fracturing method for horizontal well

A staged fracturing and packer technology, applied to wellbore/well valve devices, sealing/isolation, wellbore/well components, etc., can solve problems such as increasing the risk of tool running and fracturing construction operations , to achieve the effects of reducing fracturing construction time, improving drainage efficiency, and increasing drainage area

Inactive Publication Date: 2019-05-28
张家志 +10
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Deploying horizontal wells with long horizontal sections (generally greater than 1000m) is one of the effective means. If the conventional open-hole divider staged fracturing technology wants to increase the number of stages, it is necessary to increase the number of tools such as well-entry packers and sliding sleeves. Operational Risks of Running and Frac Construction

Method used

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  • Open hole packer staged fracturing method for horizontal well
  • Open hole packer staged fracturing method for horizontal well

Examples

Experimental program
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Embodiment 1

[0017] This embodiment provides a method for staged fracturing of an open-hole packer in a horizontal well, including the following steps:

[0018] Step 1: Wellbore preparation: adopt technical casing, scraping technical casing, and horizontal section to ensure that the hanging packer, open hole packer setting seal and fracturing sliding sleeve enter the well smoothly;

[0019] Step 2: Lowering the tool: Send the differential pressure sleeve, open hole packer, fracturing sleeve, suspension packer and back-insertion sleeve to the design position of the horizontal section with the drill pipe; An impact sliding sleeve is added between the separators;

[0020] The third step: throw the ball seat and seal the lost hand: set the open hole packer and hang the packer under different pressures to complete the lost hand;

[0021] Step 4: Tie-back: After the drill pipe is discarded, run the back-insertion string back-to-back to the back-insert, wellhead, and pressure test completion;

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Abstract

The invention relates to the field of horizontal wells, in particular to an open hole packer staged fracturing method for a horizontal well. The method comprises following steps: step one, shaft preparation; step two, tool lowering: a differential pressure sliding sleeve, an open hole packer, a fracturing sliding sleeve, a suspending packer and a back inserting tube are fed to the design positionsof a horizontal section by adopting a drill pipe; an impact sliding sleeve is added between the two packers during tool lowering; step three, ball injection and setting to finish release; step four,tie-back; step five, fracturing construction: fracturing balls matched with a fracturing sliding sleeve ball seat from small to large are fed respectively, when the fracturing balls are sent to the impact sliding sleeve, pins of a ball injection sliding sleeve are sheared off, and injection holes in the impact sliding sleeve are opened; a setting ball moves downwards through a ball seat of the impact sliding sleeve, and when the setting ball moves to a common fracturing sliding sleeve ball seat, the pins are sheared off under the pressure action, the fracturing sliding sleeve is opened, and fracturing construction of the stage is performed. With the adoption of the method, a reservoir can be exposed to a greater degree, the discharge area is increased, the number of fracturing stages is optimized, and the recovery ratio is increased.

Description

technical field [0001] The invention relates to the field of horizontal wells, in particular to a method for staged fracturing of open-hole packers in horizontal wells. Background technique [0002] At present, with the deepening of the development of Sulige gas reservoirs, the development of horizontal wells has become a widely used technology. The more stages of horizontal well fracturing, the higher the single well production of gas wells. Vigorously promote the staged fracturing of horizontal wells, it is necessary to change from general fracturing to volume fracturing, from simply increasing production to increasing both production and recovery. Deploying horizontal wells with long horizontal sections (generally greater than 1000m) is one of the effective means. If the conventional open-hole divider staged fracturing technology wants to increase the number of stages, it is necessary to increase the number of tools such as well-entry packers and sliding sleeves. Operati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B34/14E21B33/12
Inventor 张家志
Owner 张家志
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