Multistage fracturing and exploitation control method

A control method and fracturing technology, applied in the field of drilling, can solve problems such as mutual influence of joint mining, inability to increase production for a long time, and non-repeatable one-time operation, etc.

Inactive Publication Date: 2014-06-25
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing staged fracturing technologies both at home and abroad can only be used for one-time fracturing step by step, and after fracturing, all layers can be exploited together. The disadvantage is that the one-time operation cannot

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  • Multistage fracturing and exploitation control method

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Embodiment Construction

[0022] The multi-stage fracturing and production control method according to the embodiment of the present invention includes: setting switch sliding sleeves at the n production layers in the downhole, connecting adjacent switch sliding sleeves through packers, and passing A packer is connected to the completion casing, and the ball seat guide shoe is connected behind the switch sleeve at the end. When it is necessary to work in a production layer, the switch sleeve at the production layer is opened, and the switch sleeve is closed after the operation is completed. slip sleeve.

[0023] Among them, the implementation of the switch sliding sleeve can be as follows figure 1 and figure 2 As shown, its structure is as follows:

[0024] The switch sliding sleeve includes a sealing sleeve 2 and a housing. The housing includes an upper body 1, a middle body 9 and a lower body 15 connected by threads in turn. The middle part of the middle body 9 has an outer circulation hole 7, and...

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Abstract

The invention provides a multistage fracturing and exploitation control method. Switch sliding sleeves are arranged on n production layers in the pit respectively, every two adjacent switch sliding sleeves are connected through a packer, and the switch sliding sleeve at topmost end is connected to a well completion pipe sleeve through one packer. When operation needs to be conducted on a certain production layer, the switch sliding sleeve on the production layer is opened, and the sliding sleeve is closed after the operation is completed. Through the multistage fracturing and exploitation control method, production increase operation or exploitation control of the corresponding production layers can be achieved, interaction between all the layer segments can be effectively avoided, productivity of all the layer segments is maximized, the service life of a borehole is prolonged, and well drilling cost is reduced.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a multi-stage fracturing and production control method. Background technique [0002] Oil and gas reservoir mining methods at home and abroad mainly include open hole mining, liner perforating mining, and screen + open hole packer mining. The common defect of these mining methods is that they cannot be controlled and operated in sections. Means such as plugs and packers are barely segmented, and the layers always affect each other, and they are all one-off. There is no means to control the production again in the later stage. Once a problem occurs in a certain layer, it usually leads to the failure of the entire well. scrapped, resulting in heavy losses. In addition, especially for oil and gas wells with many production layers, different pressures of each production layer, uncertain productivity, different production cycles, and complex oil and gas reservoirs with their own sep...

Claims

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Application Information

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IPC IPC(8): E21B43/26
Inventor 王益山王合林周俊然高森郭超董赵朋田晓勇于怀彬
Owner CNPC BOHAI DRILLING ENG
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