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Oil field horizontal well under-pressure dragging fracturing modification operation valve and reverse well-flushing unfreezing method

A pressure-driven, horizontal well technology, applied in wellbore/well components, wellbore/well valve devices, earth-moving drilling, etc. The effect of long-term operational reliability

Active Publication Date: 2015-11-25
PETROCHINA CO LTD
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a pressure-dragging fracturing operation valve for horizontal wells in an oil field and a method for unblocking backwash wells to solve the problem of valve cores, steel balls and springs in the process of fracturing in the prior art. highly fragile

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  • Oil field horizontal well under-pressure dragging fracturing modification operation valve and reverse well-flushing unfreezing method
  • Oil field horizontal well under-pressure dragging fracturing modification operation valve and reverse well-flushing unfreezing method
  • Oil field horizontal well under-pressure dragging fracturing modification operation valve and reverse well-flushing unfreezing method

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Embodiment Construction

[0020] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0021] The lower part of the inner circle of the upper valve body of the oil field horizontal well hydraulic fracturing reconstruction operation valve is provided with a diameter-reducing step, and the upper part is connected to the pressure ring; the lower part of the pressure ring is connected by shear nails and horse-tooth buckles, and the inner and outer sets of sliding sleeves and locks The inner diameter of the sliding sleeve is smaller than the inner diameter of the pressure ring, the two ends of the sleeve are provided with ball seats, the lower part of the sleeve is provided with a circumferential pressure relief groove, and the outer circle of the lower part of the sleeve is provided w...

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Abstract

The invention provides an oil field horizontal well under-pressure dragging fracturing modification operation valve and a reverse well-flushing unfreezing method. The oil field horizontal well under-pressure dragging fracturing modification operation valve comprises an upper valve body and a lower valve body which are connected with each other, wherein a main passage and a bridge-type passage are arranged in the lower valve body; one side, facing to the upper valve body, of the main passage is provided with a chamfered ball seat; and a pressure-bearing steel ball is arranged on the chamfered ball seat. According to the technical scheme disclosed by the invention, in a normal fracturing process, fracturing fluid passes through the bridge-type passage in the valve, so that erosion damage is not generated to the main passage and the pressure-bearing steel ball; the reliability of the valve in long-term work is ensured; and the work requirement of more than 3.0m<3> / min of oil tube displacement, thousands of cubic meters of sand and tens of thousands of cubic meters of liquid can be met.

Description

technical field [0001] The invention relates to the technical field of pressure-drag fracturing transformation of horizontal wells in oil fields, and in particular relates to a pressure-drag fracturing transformation operation valve for horizontal wells in oil fields and a backwashing well unblocking method. Background technique [0002] As the main technical means to increase single well production and change the development mode, the number and proportion of horizontal wells show a rapid upward trend. At present, the development of horizontal wells in domestic oilfields adopts multi-stage fracturing stimulation, among which the hydrojet technology has an absolute advantage in multi-stage fracturing stimulation of horizontal wells in oilfields. However, the completion of each stage of fracturing in this process requires pressure relief before it can be dragged to the next stage, and the average pressure relief time for a single stage is 5 to 7 hours. With the increase of t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B34/08E21B43/26
Inventor 刘江波王治国张华光任国富赵广民邵媛冯长青何华马兵山树民闫永萍
Owner PETROCHINA CO LTD
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