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A fracturing working method for multi-stage hydraulic jet staged fracturing string

A technology of hydraulic jetting and staged fracturing, which is applied in drill pipe, casing, earthwork drilling, etc., can solve the problem of increasing construction operation cycle and operation cost, not mentioning the optional setting of packers, increasing operation Cost and operation cycle and other issues, to achieve the effect of simple fracturing work method, reducing back splash damage and reducing pipe string creep

Active Publication Date: 2015-12-02
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

[0005] 2. Segmented multi-layer fracturing tools with immovable pipe string hydraulic jet with sliding sleeve structure, packer optimization structure with sliding sleeve + backwash channel, etc. + one-time multi-layer fracturing QHY341 packer with step-by-step unsealing The development and application of domestic literature has been reported, but there is no mention of the technical content of the packer that can be selectively set, has a sliding sleeve structure and liquid flow channel control
However, limited by the nozzle material and the performance of the packer, if more than 3 sections are to be constructed, the pipe string needs to be replaced, which increases the operating cost and the operating cycle, and both economic and social benefits are disadvantageous.
[0012] 3. A single-stage spray gun with a packer is used for combined hydraulic jet fracturing. Due to the limitation of the material performance of the nozzle, continuous use of a single spray gun for more than 2 hours may cause the spray gun to fail due to excessive wear, and the packer may also be damaged due to Repeated setting leads to seal failure. At present, only 3 sections can be constructed. If more than 6 sections are designed and constructed, drilling tools need to be tripped out, which increases the construction cycle and operating costs.

Method used

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  • A fracturing working method for multi-stage hydraulic jet staged fracturing string
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  • A fracturing working method for multi-stage hydraulic jet staged fracturing string

Examples

Experimental program
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Effect test

Embodiment 1

[0089] The invention discloses a fracturing working method of a multistage hydraulic jet segmental fracturing string, the steps of which are as follows:

[0090] S1: The multi-stage hydrojet staged fracturing string should be drained and washed before going into the well;

[0091] S2: Assembling multi-stage hydraulic jet staged fracturing strings;

[0092] S3: Drill down, adjust the drilling tool to the construction position;

[0093] S4: Install the wellhead and surface pipeline, and test the pressure;

[0094] S5: Construct the first stage according to the pump injection procedure designed for fracturing construction. After the construction is completed, the oil pipe will be sprayed, and after the spray potential is weakened, 600L / min reverse circulation will be used to assist drainage;

[0095] S6: Adjust the position of the drilling tool so that the injector faces the spray point of the second section of the design, and then construct the second section according to the ...

Embodiment 2

[0104] On the basis of Example 1, when the spray gun is turned on for sandblasting and perforation, the oil pressure is abnormally low. First, compare it with the injection pressure of the previous layer. If the injection pressure drops significantly, it is judged that the nozzle erosion is serious. method:

[0105] (1) According to the operating instructions, turn on the next "injection unit" of the tool string or pull out the drill to check and replace the tool;

[0106] (2) If there is a damaged point in the multi-stage hydraulic jet staged fracturing string, pull out the drill for inspection.

Embodiment 3

[0108] As a preferred embodiment of the present invention, the present invention discloses a fracturing working method of a multi-stage hydraulic jet staged fracturing string. In the S2 step, a multistage hydraulic jet staged fracturing string is assembled The method is as follows: each stage of the multi-stage spraying tool includes a hydraulic jet packing tool and a hydraulic centralizer connected with the hydraulic jet packing tool, each stage of spraying tools is connected end to end, and the first stage of the spraying tool The hydrojet pack-off tool is connected with the righting check valve, which is connected to the eye pipe and the guide plug in turn, and the last stage of the multi-stage jetting tool is connected to the safety joint, and the oil pipe is connected to the safety joint until the wellhead.

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Abstract

The invention discloses a fracturing operation method of a multistage hydraulic jet staged fracturing tubular column. The method comprises the following steps that S1: pigging and well flushing are carried out firstly to the multistage hydraulic jet staged fracturing tubular column before descent; S2: the multistage hydraulic jet staged fracturing tubular column is assembled; S3: a drilling tool is fed and adjusted to a construction position; and S4: wellhead and surface pipelines are arranged, and the pressure is tested. The fracturing operation method is simple, multistage jet packing tools can be connected according to the number of stratums needing acid fracturing, and different stratums are fractured, so that six or more sections of hydraulic jet and fracturing combined construction can be realized currently by one time of drilling in a mode of dragging the tubular column, the tandem connection of the multistage jet packing tools can greatly accelerate the construction speed, and the construction time is saved.

Description

technical field [0001] The invention relates to a fracturing working method of a multi-stage hydraulic jet staged fracturing pipe string, which is used for well completion stimulation measures in the oil and gas drilling process, and relates to the technical field of design and manufacture of acidizing fracturing construction tools. Background technique [0002] The hydrojet staged reconstruction technology was developed in the late 1990s and is widely used abroad. It is the product of the combination of hydrojet and fracturing technology. Flat well multi-stage construction technology, which can be used for fracturing in various completion methods such as open hole, cement-consolidated casing, unconsolidated screen pipe, etc. Compared with that, the construction efficiency can be greatly improved. The principle of hydrojet staged fracturing technology is to convert pressure energy into kinetic energy. After the tubing fluid is pressurized, it will spray out a high-speed jet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267E21B21/00E21B43/114E21B17/10E21B33/128
Inventor 曹欣孙虎王祖文陆红军邓小强张冕韩文哲陈万林宁治军张文张永红刘永峰
Owner BC P INC CHINA NAT PETROLEUM CORP
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