Oil well horizontal well oil casing co-injection double seal single card volume fracturing string and fracturing method

A volume fracturing, double-sealing and single-card technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve the problems of difficult to increase construction displacement and large fluid friction.

Active Publication Date: 2017-12-26
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the existing general double-sealed single-card segmental fracturing process is only suitable for oil pipe injection fracturing construction, the fluid friction is large, and the construction displacement is difficult to increase

Method used

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  • Oil well horizontal well oil casing co-injection double seal single card volume fracturing string and fracturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] In order to make the double-seal and single-chassis staged fracturing process not only suitable for tubing injection fracturing construction, but also suitable for simultaneous injection and fracturing of the tubing annulus, the present invention provides a double-seal single-chassis double-seal and single-chassis co-injection type for oil well horizontal wells and casings Volumetric fracturing strings, such as figure 1 As shown, the tubing 9 is included, and the end of the tubing 9 is sequentially connected with a packer 5, a check valve 6, an eye tube 7 and a guide centralizer 8, and a pilot injector 4 is connected between the packer 5 and the tubing 9; The packer 5 and the second packer 3 are expansion packers, and the third packer 2 is a mechanical packer.

[0022] The oil pipe 9 is connected in series with the second packer 3, the third packer 2 and the annular injection valve 1, the second packer 3 is located above the pilot injector 4, and the third packer 2 is l...

Embodiment 2

[0025] On the basis of the foregoing embodiments, the present invention proposes a fracturing method, comprising the following steps,

[0026] First check the state of the wellbore before the construction. The fracturing method proposed by the present invention is applied to the horizontal wells of the oil wells that have been constructed, that is, the connection channels between all construction intervals and casings have been opened; For perforation operation, the perforating gun can be sent to the design position by means of conventional tubing transmission, and perforation operation can be performed on all intervals of the well at one time.

[0027] Next follow the steps below to work:

[0028] 1) Connecting the pipe string and running in the drill: connect the pipe string according to the structure in the above embodiment, and determine the position of each packer according to the length of the interval to be fractured in the oil and gas well, so that the third packer 2 a...

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Abstract

The invention belongs to the technical field of oil and gas field reservoir transformation, and specifically relates to a double-sealed single-card volume fracturing string and a fracturing method for an oil well horizontal well casing and injection, including an oil pipe whose end is sequentially connected with a packer, a single flow valve, eye tube and guiding centralizer, and a pilot injector is connected between the packer and the tubing; the tubing is connected in series with a second packer, a third packer, and an annulus injection valve, and the second The packer is located above the pressure-guiding injector, the third packer is located above the second packer, and the annular injection valve is located above the third packer and is connected in series with the tubing next to the third packer, overcoming the existing The general double-sealed single-chamber staged fracturing process is only suitable for tubing injection fracturing construction. The friction of the fluid is large and the construction displacement is difficult to increase. The tubing and casing inject fluid flow at the same time to realize the oil well horizontal well from bottom to bottom. Layer-by-layer volume fracturing construction.

Description

technical field [0001] The invention belongs to the technical field of reservoir transformation in oil and gas fields, and is one of the fracturing process strings commonly used in the transformation of oil and gas field reservoirs. split method. Background technique [0002] With the further development of the oilfield, the horizontal well volumetric fracturing method, as an efficient stimulation method, will be the main stimulation method for ultra-low permeability reservoirs. It is an effective process measure, which is widely used in the repeated reconstruction of old wells in various oil wells and horizontal wells. [0003] With the further development of oilfields, "volume fracturing" as an efficient stimulation method will be the main stimulation method for ultra-low permeability reservoirs. The current double-sealed single-card staged fracturing string consists of tools such as safety joints, expansion packers, pressure-guided sand blasters, and guide plugs. It is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26
Inventor 周丰陆红军孙虎王祖文苏敏文邓小强张文李尊团田文超隆世明宁治军王伟张波柳瑞军
Owner BC P INC CHINA NAT PETROLEUM CORP
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