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A 3.5-inch slim hole fracturing method for sidetracking horizontal wells in ultra-low permeability sandstone reservoirs

A technology for sidetracking horizontal wells and sandstone reservoirs. It is applied in wellbore/well components, earthwork drilling and production, and production fluids. Minor problems, to achieve a significant effect of increasing production, improve the success rate of temporary plugging, and achieve the effect of long horizontal section

Active Publication Date: 2022-05-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned sidetracking horizontal wells currently have the following main problems in tapping the remaining oil: First, the water injection development in the old area has formed a waterline in the direction of the maximum principal stress (the direction of the water injection well row), which has a high risk of water breakthrough, the length of the horizontal section is small, and the number of stimulation sections is small. Second, there are no mature staged fracturing tools in the 3.5-inch horizontal wellbore, so staged fracturing is very difficult

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  • A 3.5-inch slim hole fracturing method for sidetracking horizontal wells in ultra-low permeability sandstone reservoirs
  • A 3.5-inch slim hole fracturing method for sidetracking horizontal wells in ultra-low permeability sandstone reservoirs

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specific Embodiment approach

[0022] 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 content disclosed in the present invention without affecting the functions and objectives of the present invention.

[0023] 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 sub...

Embodiment 1

[0026] The invention discloses a 3.5-inch slim hole fracturing method for sidetracking a horizontal well in an ultra-low permeability sandstone reservoir, comprising the following steps:

[0027] Step 1) Use the wellbore of the water-flooded oil well to arrange the horizontal section of the sidetracked horizontal well obliquely to the direction of the maximum principal stress of the reservoir;

[0028] Step 2) Perform multi-stage perforation on the low water wash interval of the sidetracked horizontal well;

[0029] Step 3) Running a single-seal fracturing string in the vertical wellbore section of the water-flooded oil well;

[0030] Step 4) Carry out the first stage fracturing construction;

[0031] Step 5) Dosing temporary plugging agent for temporary plugging of first-stage fractures;

[0032] Step 6) Then repeat step 4) and step 5) to complete all stages of fracturing construction;

[0033] Step 7) Shut down the well and release the blowout, and pull out the single-sea...

Embodiment 2

[0035] The invention discloses a 3.5-inch slim hole fracturing method for sidetracking a horizontal well in an ultra-low permeability sandstone reservoir, comprising the following steps:

[0036] Step 1) Use the wellbore of the water-flooded oil well to arrange the horizontal section of the sidetracked horizontal well obliquely to the direction of the maximum principal stress of the reservoir;

[0037] Step 2) Perform multi-stage perforation on the low water wash interval of the sidetracked horizontal well;

[0038] Step 3) Running a single-seal fracturing string in the vertical wellbore section of the water-flooded oil well;

[0039] Step 4) Carry out the first stage fracturing construction;

[0040] Step 5) Dosing temporary plugging agent for temporary plugging of first-stage fractures;

[0041] Step 6) Then repeat step 4) and step 5) to complete all stages of fracturing construction;

[0042] Step 7) Shut down the well and release the blowout, and pull out the single-sea...

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Abstract

The invention discloses a 3.5-inch slim hole fracturing method for sidetracking a horizontal well in an ultra-low permeability sandstone reservoir, comprising the following steps: step 1) using the wellbore of a water-flooded oil well to arrange sidetracking obliquely to the direction of the maximum principal stress of the reservoir Horizontal section of the horizontal well; step 2) multi-stage perforation in the low water wash section of the sidetracked horizontal well; step 3) running a single-seal fracturing string in the vertical wellbore section of the water-flooded oil well; step 4) performing the first stage fracturing construction; step 5) adding temporary plugging agent to temporarily plug first stage fractures; step 6) then repeating step 4) and step 5) to complete all stages of fracturing construction; A bill was issued to seal the fracturing string for production resumption.

Description

technical field [0001] The invention belongs to the technical field of oil production engineering, and in particular relates to a 3.5-inch slim hole fracturing method for a sidetracked horizontal well in an ultra-low permeability sandstone reservoir. Background technique [0002] The existing ultra-low permeability sandstone reservoirs are developed by the main development method of "water injection + fracturing". Due to the influence of reservoir heterogeneity and fracture extension after multiple rounds of measures, the oil wells with fractures mainly upward have the dominant direction of water flooding. , resulting in premature water breakthrough in the main direction oil well, serious loss of production capacity, and failure to fully exploit the remaining oil. Sidetracking horizontal wells can effectively increase the controlled reserves of a single well. Compared with directional wells, they have the advantages of large contact area with the oil layer, large stimulation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/30E21B43/11
CPCE21B43/26E21B43/261E21B43/305E21B43/11
Inventor 苏良银刘汉斌卜向前齐银常笃汪澜董奇
Owner PETROCHINA CO LTD