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Horizontal Well Fracture Sealing Wellbore Reengineering and Repeated Fracturing Method

A technology for repeated fracturing and horizontal wells, which is applied in wellbore/well components, earthwork drilling, sealing/isolation, etc. It can solve problems such as inability to achieve large displacement reconstruction, poor cementing quality, and increased risk of pipe sticking , to achieve the effects of flexible construction methods, improved construction timeliness, and wellbore cleaning

Active Publication Date: 2021-06-01
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The repeated stimulation of conventional horizontal wells mostly adopts the double-seal and single-stuck fracturing process. Due to the constraints of the tubing and double packers, it cannot achieve large-displacement stimulation, and often due to poor cementing quality, casing strings are caused to increase sticking. risk

Method used

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  • Horizontal Well Fracture Sealing Wellbore Reengineering and Repeated Fracturing Method
  • Horizontal Well Fracture Sealing Wellbore Reengineering and Repeated Fracturing Method
  • Horizontal Well Fracture Sealing Wellbore Reengineering and Repeated Fracturing Method

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Embodiment Construction

[0035]The invention will be described in detail below with reference to the accompanying drawings.

[0036]The invention includes the following steps:

[0037]First, the wellbore regeneration process:

[0038]1, carry out the wellbore energy supplement, due to the loss of formation capacity due to the early market, should be injected into the formation of more than 3 times the liquid to restore its energy, and the judgment criterion is greater than the wellhead pressure is greater than the closed pressure of the well. It can stop the injection (seefigure 1 ), Its role is to avoid waste of subsequent materials due to the large amount of stratum absorption, economically cost effective;

[0039]2, injecting the crack 1 injection of the crack blocking granules 2 block the original cracks, the crack sealing particles are low-density elastic particles. After entering the crack, it is physically blocked by the formation of the formation pressure to rely on its own elasticity (seefigure 2 ), Due to wid...

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Abstract

Horizontal well fracture plugging wellbore reconstruction and repeated fracturing method, injecting liquid into the formation until the wellhead injection pressure is greater than the formation closure pressure of the well; injecting fracture sealing particles into the original fracture; injecting cement into the formation; then injecting drillable plugging materials; After the particles and fracture plugging particles are stabilized, drill and grind the drillable plugging material and circulate it out of the ground through liquid; pump the first drillable bridge plug and perforating gun into the first new Control the perforating gun to perforate the fracture position. At the same time, the perforating gun is separated from the first drillable bridge plug, the first drillable bridge plug is set and sealed, and then the perforating gun is pulled out, and then the casing injection pressure cracks, drillable bridge plugs and perforating gun pumps were injected repeatedly to complete all intervals to be reconstructed. The present invention creates a brand-new wellbore by plugging old fractures and filling the unqualified layers with plugging agent and cement, which can effectively prevent tool sand burial caused by communication between the upper and lower layers outside the casing due to poor cementing quality. .

Description

Technical field[0001]The present invention relates to a method of re-embraced repeating fracturing of oilfield horizontal well, which is suitable for the repeated fracturing modification of the horizontal well of the sleeve completion mode, the supporting tool is simple, and the construction is convenient.Background technique[0002]Regular transformation of conventional horizontal wells is mostly used in double-sealing single card fracturing process, which is due to a large displacement modification due to the oil pipe and double clutch, and often causes a sleeve tube to increase the card diamond. risk.Inventive content[0003]SUMMARY OF THE INVENTION An object of the present invention is to provide a horizontal well cracking blocking a reeficing repeating fracturing method, by blocking the old crack, and a new wellbore is manufactured with a new wellbore and effectively prevents Tool sand buried by the upper and lower layer communication caused by the outer layer of the sleeve due to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B33/13
CPCE21B33/13E21B43/26
Inventor 何华任勇郭小勇蒙鑫李志文刘忠能冯长青王治国赵粉霞王在强
Owner PETROCHINA CO LTD
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