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Fracturing tubular column dragged under pressure and fracturing method thereof

A technology of dragging and fracturing pipe strings under pressure, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., and can solve the constraints of high efficiency, low cost and high cost of horizontal well staged fracturing technology , lengthening of construction period, etc.

Inactive Publication Date: 2015-04-29
PETROCHINA CO LTD
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Problems solved by technology

The blowout prevention time is up to 20 hours, the construction period is prolonged, and the cost is high, which restricts the development of horizontal well staged fracturing technology in the direction of high efficiency and low cost

Method used

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  • Fracturing tubular column dragged under pressure and fracturing method thereof

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Embodiment

[0008] refer to figure 1 Embodiments of the present invention are further described:

[0009] The pressurized drag fracturing string is composed of a hydraulic controllable on-off valve 2 connected through a tubing 1 and a perforating fracturing string 3 with an injector 4 at the upper end.

[0010] The fracturing method of the drag fracturing string under pressure is as follows:

[0011] 1. First, run the perforating and fracturing string 3 into the well normally;

[0012] 2. According to the engineering design, install the hydraulic controllable on-off valve 2 at the position of the five oil pipes above the kickoff point O to ensure that the pipe string will not go down into the kickoff point when it moves, and then connect the oil pipe 1 to the blowout preventer Wellhead;

[0013] 3. After the surface pipeline is connected and the perforation and fracturing of the first section of the reservoir are carried out, the tubing 1 is removed, the pipeline is injected, the blowo...

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Abstract

The invention discloses a fracturing tubular column dragged under pressure and a fracturing method thereof, which are designed for increasing the tool construction efficiency and lowering the construction cost. The fracturing tubular column consists of a hydraulic controllable switching valve and a perforation fracturing tubular column which are connected with each other through an oil pipe. Before perforation fracturing construction, the perforation fracturing tubular column is placed into a well, the hydraulic controllable switching valve is arranged at a position above a kickoff point, and normal perforation fracturing construction is performed; after construction, the hydraulic controllable switching valve is closed by projecting a ball, and the perforation fracturing tubular column is dragged under pressure to a next-segment reservoir stratum position to perform next-segment perforation fracturing construction; after fracturing construction of all perforation segments is finished, blowout is performed once, and the well is washed completely. By adopting the method, blowout after perforation fracturing construction of each segment can be prevented, the construction time is saved, and environmental pollution caused by blowout liquid is prevented; stratum overflow liquid can be prevented from damaging the perforation tubular column after perforation fracturing, and the construction efficiency is increased; the labor intensity of workers is lowered, the requirement of expansion of a well site for blowout is omitted, and the construction cost is lowered.

Description

technical field [0001] The invention relates to a dragging fracturing pipe string under pressure and a fracturing method thereof, and belongs to the technical field of fracturing transformation of oil and gas fields. Background technique [0002] At present, hydraulic jet fracturing technology is mainly used in oil fields for staged fracturing of horizontal wells and reconstruction of old wells. This technology has been widely used for its unique integrated operation of perforation and fracturing, high construction efficiency and low risk. . However, after the oil well is reconstructed, it is necessary to adjust the drilling tool with blowout to carry out the next stage of reconstruction. The blowout construction needs to expand the well site, prepare the mud pool for storing the spray liquid, and provide various related materials and facilities. The blowout prevention time is up to 20 hours, the construction period is prolonged, and the cost is high, which restricts the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 刘明刘江波任勇赵振峰王在强胡相君张安康李旭梅
Owner PETROCHINA CO LTD
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