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Slim-hole sidetracking horizontal well segmented multi-cluster fracturing method

A technology of sidetracking horizontal wells and horizontal wells, which is applied in the direction of boreholes/well components, earthwork drilling, production fluids, etc., and can solve the problems of affecting the effect of repeated stimulation, low opening rate of each cluster of fracturing, and low construction efficiency. It achieves the effect of high construction efficiency, remarkable effect after pressing, and simple on-site construction

Active Publication Date: 2019-08-16
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 slim-hole sidetracking horizontal well segmented multi-cluster fracturing method. The slim-hole sidetracking horizontal well segmented multi-cluster fracturing method comprises the following steps that the number of fracturing segments and perforation positions are determined according to reservoir conditions; multi-cluster perforation is adopted in each segment to complete the multi-cluster fracturing of the first segment; and then segmented fracturing of the second segment and the subsequent segments is realized by pumping a small-diameter soluble bridge plug through hydraulic power, wherein in the fracturing construction process, soluble temporary plugging turning particles are pumped in to plug cracked clusters, fracturing fluid is forced to enter non-crackedclusters, and effective multi-cluster fracturing in the segments is realized; and after the fracturing construction is completed, the small-diameter soluble bridge plug and the temporary plugging turning particles dissolve under the formation condition without affecting the reconstruction effect, and the steps are repeated until the fracturing of all the segments of the slim-hole sidetracking horizontal well is completed. According to the slim-hole sidetracking horizontal well segmented multi-cluster fracturing method, the problems of complicated construction procedures of the small-diameter retrievable type bridge plug and low opening rate of various clusters of general fracturing can be solved. The slim-hole sidetracking horizontal well segmented multi-cluster fracturing method has the characteristics of no plug drilling, high construction efficiency and low cost, and the purpose of segmented multi-cluster fracturing of the slim-hole sidetracking horizontal well is realized.

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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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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