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Single upper seal sand blasting perforation fracturing technology

A sandblasting, perforating and fracturing technology, which is applied in the fields of production fluids, wellbore/well components, earth-moving drilling, etc. to achieve the effect of not easy sticking and easy sand washing.

Inactive Publication Date: 2009-06-03
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It basically solves the problems related to the fracturing construction of horizontal wells, but there are still many deficiencies. For example, during the fracturing construction, it is necessary to supplement the fracturing fluid from the casing and add a set of fracturing construction equipment; When it is higher, acid treatment is needed to break it; when the second layer of sandblasting and perforation fracturing is performed, whether the second layer is broken or not becomes a focus of layered fracturing

Method used

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  • Single upper seal sand blasting perforation fracturing technology

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 as figure 1 As shown, the construction string connected with the hydraulic anchor 3, the mechanically set packer 4, the hydraulic injector 5, the injectable sand fluid backflow protector 6, and the oil pipe 2 are lowered into the casing from top to bottom. In the pipe 1, the water jet 5 should be aimed at the layer to be constructed;

[0032] 1) Press figure 1 According to the connection method shown in , the construction pipe is run down to the oil and gas layer to be constructed;

[0033] 2) Inject from tubing 2 and return from casing 1 to perform positive circulation flushing;

[0034] 3) After the positive cycle flushing is completed, put the injectable sand liquid backflow protector 6 from the wellhead, and send it to the lower part of the hydraulic injector with a certain displacement of liquid flow, and let it push the lower part of the hydraulic injector 5 It is completely blocked, and there is no puncture leakage; the pumped liquid can only be spra...

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Abstract

The invention belongs to the technical field of downhole operation in the field of petroleum gas exploitation, and particularly relates to a single upper seal sand blasting perforation fracturing technology. The invention is characterized in that a hydraulic ejector (5) is connected with the lower part of an oil pipe (2); a mechanical seat seal type packer (4) and a hydraulic anchor (3) are connected sequentially with the oil pipe (2) at the upper part of the hydraulic ejector (5); and a droppable sand liquid reflux protector (6) is connected with the lower part of the hydraulic ejector (5) through connecting pieces. The invention has the advantages of combining the sand blasting, perforation and the fracturing technology, reducing the working procedure, reducing operating risks and reducing cost.

Description

technical field [0001] The invention belongs to the technical field of downhole operation in the field of petroleum and natural gas development, in particular to a single upper seal sand blasting perforation fracturing process. Background technique [0002] The downhole operation must first carry out the procedures of well washing, perforation, fracturing, fluid drainage, sand flushing, and finally completion. The initial procedure is basically a procedure of changing the drilling tool. The operation time is long and the workload of the staff is heavy. ; Developed to the present, basically washing the next drilling tool, and then the next fracturing drilling tool can complete the well. Hydraulic sand blasting perforation can combine perforation and fracturing technology, reduce the process of perforating with perforating bullets, and each process can reduce the construction cost of perforation operations for downhole operations, and reduce various downhole operations used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/114
Inventor 李静群孙虎邓继学
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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