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Horizontal well crack plugging and wellbore reconstruction repeated-fracturing method

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

Active Publication Date: 2019-07-05
PETROCHINA CO LTD
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  • 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 crack plugging and wellbore reconstruction repeated-fracturing method
  • Horizontal well crack plugging and wellbore reconstruction repeated-fracturing method
  • Horizontal well crack plugging and wellbore reconstruction repeated-fracturing method

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Embodiment Construction

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

[0036] The present invention comprises the following steps:

[0037] 1. Wellbore reconstruction process:

[0038] 1. Carry out wellbore energy replenishment. Due to the shortage of formation capacity caused by early mining, more than 3 times of liquid should be injected into the formation to restore its energy. The judgment standard is that the injection pressure at the wellhead is greater than the formation closure pressure of the well and the injection can be stopped (see figure 1 ), its role is to avoid subsequent material waste due to the large absorption of the formation, and save economic costs;

[0039] 2. Inject fracture plugging particles 2 into the original fracture 1 to seal the original fracture. The fracture plugging particles are low-density elastic particles. After entering the fracture, they are squeezed by formation pressure and rely on their own el...

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Abstract

The invention discloses a horizontal well crack plugging and wellbore reconstruction repeated-fracturing method. The horizontal well crack plugging wellbore reconstruction repeated-fracturing method comprises the steps that liquid is injected into a formation until the wellhead injection pressure is greater than the well formation closing pressure; crack plugging particles are injected into original cracks; cement is injected into the formation; then drillable plugging materials are injected; after the cement and the crack plugging particles are stable, a drilling and grinding tool is trippedin to drill and grind the drillable plugging materials, and the drillable plugging materials are circulated out of the ground through the liquid; a first drillable bridge plug and a perforating gun pump are tripped into the first new crack position, a perforating gun is controlled to conduct perforating, meanwhile, the perforating gun is separated from the first drillable bridge plug, the first drillable bridge plug completes setting, then the perforating gun is tripped out, sleeve injection fracturing is conducted, and the drillable bridge plug and the perforating gun pump are tripped in repeatedly to complete all layer sections needing to be transformed. By plugging old cracks and conducting plugging agent and cement filling on the previous well-cementation-unqualified layer sections, abrand new wellbore is manufactured, and thus tool sand-burying caused by communication of upper and lower layers outside a sleeve due to poor well-cementation quality is effectively prevented.

Description

technical field [0001] The invention relates to a method for repeated fracturing of oilfield horizontal well fracture sealing and wellbore reconstruction, which is suitable for repeated fracturing reconstruction of horizontal wells in casing completion mode, and has simple supporting tools and convenient and simple construction. Background technique [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 stringing occurs and pipe sticking increases. risk. Contents of the invention [0003] The purpose of the present invention is to provide a horizontal well fracture plugging wellbore reconstruction and repeated fracturing method. By plugging old fractures and filling the previously unqualified layers with plugging agent and cement, a brand new ...

Claims

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Application Information

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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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