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A Segmented Multi-cluster Fracturing Method for Sidetracking Horizontal Wells with Slim Holes

A technology for sidetracking horizontal wells and horizontal wells, which is applied in wellbore/well components, earthwork drilling, and fluid production, etc., can solve the problems of low opening rate of each fracturing cluster, affecting the effect of repeated stimulation, and low construction efficiency, etc. Achieve the effect of remarkable post-pressing effect, high construction efficiency and simple on-site construction

Active Publication Date: 2021-08-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a segmented multi-cluster fracturing method for sidetracking horizontal wells with slim holes, which overcomes the 1: complex process of the existing segmented fracturing method in the prior art, 2: The opening rate of each cluster in general fracturing is low, which affects the effect of repeated stimulation. 3: There are problems such as drilling plugs, low construction efficiency, and high cost

Method used

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specific Embodiment approach

[0029] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope covered by the technical contents disclosed in the present invention without affecting the functions and objectives of the present invention.

[0030] At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any su...

Embodiment 1

[0034] The invention discloses a segmented multi-cluster fracturing method for sidetracking horizontal wells with slim holes, which comprises the following steps:

[0035] Step 1) Determine the number of fracturing stages and perforation positions of the sidetracking horizontal well in the slim hole;

[0036] Step 2) Run the first well gauge to the hanger position in the sidetracking horizontal well of the slim hole, pull out the first well gauge and then run the second well gauge to the bottom of the slim hole sidetracking horizontal well;

[0037] Step 3) Pull out the second well gauge, use 1.9" tubing and use active water to flush the slim hole sidetracked horizontal well to the bottom of the well, and then use 1.9" tubing to transport small-diameter perforating bullets for the first multi-cluster perforation;

[0038] Step 4) Run the packer into the upper part of the hanger 1~2m with a single sealing string, and perform fracturing construction on the first section. When th...

Embodiment 2

[0045] The invention discloses a segmented multi-cluster fracturing method for sidetracking horizontal wells with slim holes, which comprises the following steps:

[0046] Step 1) Determine the number of fracturing stages and perforation positions of the sidetracking horizontal well in the slim hole;

[0047] Step 2) Run the first well gauge to the hanger position in the sidetracking horizontal well of the slim hole, pull out the first well gauge and then run the second well gauge to the bottom of the slim hole sidetracking horizontal well;

[0048] Step 3) Pull out the second well gauge, use 1.9" tubing and use active water to flush the slim hole sidetracked horizontal well to the bottom of the well, and then use 1.9" tubing to transport small-diameter perforating bullets for the first multi-cluster perforation;

[0049] Step 4) Run the packer into the upper part of the hanger 1~2m with a single sealing string, and perform fracturing construction on the first section. When the ...

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Abstract

The invention discloses a staged multi-cluster fracturing method for sidetracking horizontal wells in small wells. The number of fracturing stages and perforation positions are determined according to reservoir conditions. Then, hydraulic pumping of small-diameter soluble bridge plugs is used to realize the staged fracturing of the second and subsequent stages. During the fracturing construction process, the soluble temporary plugs are pumped to divert particles to block the clusters that have started to fracture, forcing the fracturing process. After the fracturing operation is completed, the small-diameter soluble bridge plugs and temporarily plugged diverting particles will dissolve by themselves under the formation conditions, without affecting the fracturing effect. Repeat the above steps, Until the fracturing of all sections of the sidetracking horizontal well in the small hole is completed, the present invention can solve the problems of complicated construction procedures of small-diameter fishable bridge plugs and low opening rate of each cluster in general fracturing. With the characteristics of high cost and low cost, the purpose of staged multi-cluster fracturing of sidetracking horizontal wells in small wells is achieved.

Description

technical field [0001] The invention belongs to the field of oilfield fracturing, and in particular relates to a segmented multi-cluster fracturing method for sidetracking horizontal wells with slim holes, which is suitable for 3 1 / 2 "Slim hole sidetracking horizontal well with tubing (inner diameter 76mm) cementing and completion. Background technique [0002] Fracturing is an important way to transform low-permeability oil and gas reservoirs and realize profitable development. Temporary plugging and diversion fracturing technology can seal the original fractures, realize fracture diversion, and form new fractures, thereby forming a complex fracture network system and increasing gas well drainage area to achieve the purpose of gas well stimulation. [0003] Sidetracking of old wells is an effective technical means to tap remaining oil potential, control low production and long-term well shutdown. It has been widely used at home and abroad. Ultra-low permeability reservo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/267E21B33/134E21B33/13
CPCE21B33/13E21B33/134E21B43/261E21B43/267
Inventor 常笃齐银陆红军张矿生卜向前任勇苏良银汪澜刘兴银赵广民
Owner PETROCHINA CO LTD
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