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A rotatable nozzle type double-cluster hydraulic jet fracturing string and fracturing method

A technology of hydraulic jetting and rotating nozzles, applied in the field of oil and gas well fracturing, can solve the problems of uneven concentration, flow rate, pressure, and inability to adjust the orientation, achieves significant application effects, improves the success rate of directional perforation fracturing, and is practical in the field. strong effect

Active Publication Date: 2019-03-15
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

[0003] The purpose of the present invention is to overcome the inability to adjust the orientation of the injector nozzles on the existing multi-stage hydraulic jet fracturing string used for fracturing and perforation operations, resulting in sand between the upstream and downstream injectors of the multi-stage hydraulic jet fracturing string. Problems with uneven concentration, flow and pressure

Method used

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  • A rotatable nozzle type double-cluster hydraulic jet fracturing string and fracturing method
  • A rotatable nozzle type double-cluster hydraulic jet fracturing string and fracturing method
  • A rotatable nozzle type double-cluster hydraulic jet fracturing string and fracturing method

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Effect test

Embodiment 1

[0028] This embodiment provides a rotatable nozzle type double-cluster hydraulic jet fracturing string, such as figure 1 As shown, it includes oil pipe 1, safety joint 2, hydraulic injection device 1, hydraulic injection device 2, check valve 9, telescopic compensator 10 and bottom seal dragging fracturing packer 11, which are connected sequentially from top to bottom. It is characterized in that: the hydraulic injection device 1 and the hydraulic injection device 2 have the same structure, and they are all screwed in turn from top to bottom. 5 components of hydro jet;

[0029] Such as figure 2 , Figure 4 and Figure 5 As shown, the rotatable nozzle type double-helix hydraulic injector 5 includes an injector body 6, and the inner cavity wall of the injector body 6 is provided with an Archimedes double-helix flow channel 13, and the Archimedes double-helix flow channel 13 is evenly distributed. There are four nozzle sleeves 7 distributed, and the nozzle sleeves 7 are thre...

Embodiment 2

[0042] On the basis of Example 1, the surface of the Archimedes double helix flow channel 13 is plated with a nickel-based alloy material. Both the rotatable-nozzle type double-helix water jet 5 and the inner cavity of the Archimedes double-helix nipple 4 are designed with the same Archimedes double-helix trapezoidal structure, and the grooves are coated with anti-wear and corrosion-resistant materials to prevent The change of the fluid swirl direction causes local erosion of the double helix groove flow channel, which improves the effect of the double helix swirl flow.

Embodiment 3

[0044] On the basis of Embodiment 1, the tapered roller bearing 12 and the nozzle sleeve 7 are interference fit, and the tapered roller bearing 12 and the spherical nozzle 8 are sealed and connected by a sealing pair. The radial rotatable angle range of the spherical nozzle 8 is ±45°. The nozzle cover 7 is connected with the injector body 6 through the external thread of the nozzle cover 7, which is convenient for nozzle maintenance or replacement when it is damaged.

[0045] The spherical nozzle 8 and the nozzle cover 7 are made of erosion-resistant cemented carbide tungsten carbide YG8 material, and the hardness reaches HRC92-95 after heat treatment; the tapered roller bearing 12 is made of high-carbon chromium bearing steel GCr15 material, which has a high Excellent contact fatigue strength, high wear resistance and dimensional stability. The Archimedes double helix short joint 4 and the rotatable nozzle type double helix hydraulic injector 5 are made of 35CrMo material, a...

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Abstract

The invention provides a rotatable-nozzle-type double-cluster water jet fracturing tubular column and a fracturing method. Archimedes double-helix structures are designed in inner cavities of conventional water ejectors structurally, four spherical nozzles are distributed on a double-helix groove of an inner cavity of each ejector body, the flowing state and the flowing direction of fluids with sand are changed to enable the fluids to evenly enter each nozzle, the problem of incapability of adjusting the orientation of nozzles of double-cluster water ejectors of horizontal wells is solved effectively, the problem of unevenness in concentration, flow and pressure of the sand between the upstream nozzles and the downstream nozzles of the bottom-packer-dragging double-cluster water jet fracturing tubular column is also solved, and early failure of some ejector due to uneven washout of the upstream ejectors and the downstream ejectors of the bottom-packer-dragging double-cluster water jet fracturing tubular column is prevented effectively, so that fracturing success rate of directional ejection holes of the double-cluster water jet fracturing tubular column is increased greatly, on-site practicability is high, application effect is remarkable, and the rotatable-nozzle-type double-cluster water jet fracturing tubular column is applicable to bottom-packer-dragging graded double-cluster water jet fracturing process of the horizontal wells.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well fracturing, and in particular relates to a rotatable nozzle type double-cluster hydraulic jet fracturing pipe string and a fracturing method, which are suitable for horizontal wells with bottom seal dragging and graded double-cluster hydraulic jet fracturing technology. Background technique [0002] The staged fracturing technology of hydrojet annular sand adding is the mainstream technology for increasing reserves and production of low permeability oil and gas reservoirs in Changqing Oilfield. Integrated construction of reservoir stimulation, oil testing and well completion in oil and gas reservoirs. At present, before double-cluster hydrojet fracturing is carried out in a horizontal well with bottom seal, when the jet fracturing string is lowered into the target formation in the horizontal well section, the double-cluster hydrojet basically comes into contact with the inner wall of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/114E21B43/119
CPCE21B43/114E21B43/119E21B43/26
Inventor 仝少凯王祖文白明伟杨小平岳艳芳樊炜温亚魁张冕徐迎新牛成飞张激武
Owner BC P INC CHINA NAT PETROLEUM CORP
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