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Horizontal well no-throttle straddle-type double-sealing single-grip fracturing process

A double-seal, single-card, and non-throttling technology, which is applied in the direction of production fluid, sealing/isolation, wellbore/well components, etc., can solve problems such as the influence of oil casing pressure difference, and achieve high pressure bearing index and high construction efficiency Effect

Inactive Publication Date: 2015-12-23
PETROCHINA CO LTD +1
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Problems solved by technology

Conventional packers also have the problem that they are seriously affected by the pressure difference of the oil casing when they are hydraulically set and unsealed

Method used

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  • Horizontal well no-throttle straddle-type double-sealing single-grip fracturing process

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[0013] detailed description: Below in conjunction with accompanying drawing, the present invention is described further: the present invention is realized by following device: it is made of 1-oil pipe, 2-sleeve pipe, 3-pressure balance valve, 4-safety joint, 5-hydraulic anchor, 6 -Y111 packer, 7-large sand blaster, 8-Y211 packer; pressure balance valve 3, safety joint 4, hydraulic anchor 5, Y111 packer 6, large sand blaster 7 , the Y211 packer 8 is connected to the tubing 1 through threads in turn, and the above process is realized through the following steps:

[0014] a. First, connect the pressure balance valve 3, safety joint 4, hydraulic anchor 5, Y111 packer 6, large sand blaster 7, and Y211 packer 8 to the oil pipe 1 through threaded fasteners in turn, and run them into the casing 2 middle;

[0015] b. Secondly, after lowering the device into the pre-fracturing interval, lift the device up first, set the Y211 packer 8, and then observe the construction curve to check ...

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Abstract

The invention belongs to the technical field of oilfield production engineering, relates to a horizontal well no-throttle straddle-type double-sealing single-grip fracturing process, and solves the technical field of the existing technology that the throttle construction emission is small and the pressure bearing index is low, and can satisfy the large-scale fracturing construction requirements. A well-connected device is put into a sleeve 2 and then a fracturing layer, a Y211 packer 8 is set, and then a pipe pole is pressed down and then a Y111 packer 6 is set, and a large sand-amount sand spraying device 7 works and fracturing is started. After fracturing, the pipe pole is lifted upwards, a pressure balance valve 3 opens, the device is continuously lifted upwards and the Y211 packer 8 and the Y111 packer 6 are released. The setting and the releasing adopt the mechanical way, the construction efficiency is high, the pressure bearing index is high, and the horizontal well no-throttle straddle-type double-sealing single-grip fracturing process is more suitable for large-scale multi-stage multi-group fracturing construction.

Description

technical field [0001] The invention relates to the technical field of oil production engineering in oilfields, and belongs to a non-throttling straddle double-seal single-clamp fracturing process for horizontal wells in oilfields. Background technique [0002] At present, the conventional differential pressure packer used in the staged fracturing process of horizontal wells needs to design a choke nozzle, which has the problems of small displacement and small scale of sand addition in the staged fracturing technology of horizontal wells. The conventional packer also has the problem that it is seriously affected by the pressure difference of the oil casing when it is hydraulically set and unsealed. Contents of the invention [0003] The purpose of the present invention is to develop a horizontal well unthrottled straddle double seal single card fracturing process that can realize large sand volume, high displacement multi-stage large-scale fracturing, and can realize mecha...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B33/122
Inventor 王金友唐鹏飞李琳许国文张宏岩李博睿张春辉张晓川程木林张洋
Owner PETROCHINA CO LTD
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