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A method for realizing temporary plugging and turning to multi-fracture fracturing in a horizontal well section

A horizontal well section and fracturing technology, which is applied in chemical instruments and methods, earthwork drilling and production, wellbore/well parts, etc., can solve the problem of poor plugging effect of temporary plugging agent, ineffective improvement of well section, and sealing Insufficient plugging effect and other problems, to achieve the effect of improving plugging effect, improving plugging success rate, and high fracturing efficiency

Active Publication Date: 2019-04-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. The uniform particle size of the existing temporary plugging agent has poor plugging effect
[0006] 3. The existing temporary plugging agent is directly added into the fracturing fluid, and it is easy to disperse when it is transported to the formation through the tubing, and the plugging effect is not good
[0007] 4. The existing multi-stage fracturing technology often has some well sections that cannot be effectively stimulated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In order to overcome the problems existing in the prior art, this embodiment provides a method for realizing temporary plugging in a horizontal well section and turning to multi-fracture fracturing, which includes the following steps:

[0032] 1) Firstly, prepare the working fluid for temporary blocking and steering, adjust the displacement of the liquid dispensing vehicle to 300L / min, add 53%-74.5% low-viscosity carrier fluid by volume percentage, and circulate for 10min. When the Young's modulus is less than 25000MPa, all the degradable temporary plugging agents with large particle size are used; when the Young's modulus is 25000-30000MPa, the small particle size can be degraded Temporary plugging agent accounted for 70%, degradable temporary plugging agent with large particle size accounted for 30%, when Young's modulus is greater than 30000MPa, degradable temporary plugging agent with small particle size accounted for 30%, degradable temporary plugging agent with lar...

Embodiment 2

[0039] On the basis of Example 1, this example provides a method for maintaining the flow conductivity of multi-fracture fracturing openings in a horizontal well section. The particle size range of the degradable temporary plugging agent is 0.1-10mm, and the small particle size can The particle size range of the degradable temporary plugging agent is 0.1-1 mm, and the particle size range of the degradable temporary plugging agent with large particle size is 1-10 mm.

[0040] The degradable temporary plugging agent is composed of multi-scale (particle size 0.1-10mm) temporary plugging particles mixed in a certain proportion, the degradable temporary plugging agent with a large particle size of 1-10mm is blocked at the fracture port, and the small particle size of 0.1-1 mm It is filled between large particle size degradable temporary plugging agents, effectively and quickly improving the plugging effect, and the mixing ratio is optimized and determined according to the characterist...

Embodiment 3

[0043] This embodiment provides a method for maintaining the fluid conductivity of multi-fracture fracturing openings in a horizontal well section, including the following steps:

[0044] 1) Firstly, prepare the working fluid for temporary blocking and steering, adjust the displacement of the liquid dispensing vehicle to 300L / min, add 53%-74.5% low-viscosity carrier fluid by volume percentage, and circulate for 10min. When the Young's modulus is less than 25000MPa, all the degradable temporary plugging agents with large particle size are used; when the Young's modulus is 25000-30000MPa, the small particle size can be degraded Temporary plugging agent accounted for 70%, degradable temporary plugging agent with large particle size accounted for 30%, when Young's modulus is greater than 30000MPa, degradable temporary plugging agent with small particle size accounted for 30%, degradable temporary plugging agent with large particle size accounted for 70% %, finally add 17%-30% degr...

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PUM

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Abstract

The invention relates to a method for realizing temporary plugging redirecting multiple crack fracturing inside a horizontal well section. The method comprises the following steps: firstly preparing a temporary plugging redirecting working liquid which includes a degradable temporary plugging agent, degradable fibers, and a low-viscosity transport liquid; conducting sectional fracturing, and conducting pump casting in an order of a preset liquid-a sand carrying fluid-the temporary redirecting working liquid; and after the completion of the entire fracturing, waiting for the temporary redirecting working liquid to degrade, and discharging the temporary redirecting working liquid. According to the method, plugging efficiency is increased through the adoption of the multiple dimension degradable temporary plugging agent, leakage loss among inter-crack liquid is reduced, and plugging success rate is increased. After construction, the degradable temporary plugging agent, and the degradable fibers are completely degraded under well bottom temperature, leave no residue and produce no pollution to artificial cracks. The method of the invention is conducive to rapid plugging of cracks, increases success rate of temporary plugging redirecting fracturing, reduces construction cost, and increase oil and gas reservoir recovery efficiency.

Description

technical field [0001] The invention relates to the field of staged reconstruction of horizontal wells in low-permeability gas reservoirs, in particular to a method for realizing temporary plugging in horizontal well sections and shifting to multi-fracture fracturing. Background technique [0002] The Sulige gas field is a typical tight sandstone gas reservoir. The reservoirs have strong lateral heterogeneity, multi-stage vertical superposition, and horizontal wellbore trajectories penetrate multiple sand bodies. Temporary plugging multi-fracture fracturing technology is a technology to achieve multi-stage stimulation of horizontal wells, which overcomes the heterogeneity of reservoirs and maximizes the number of fractures created. Temporary plugging multi-fracture fracturing technology is to add an appropriate amount of temporary plugging agent to the formation in a timely manner during the construction process, and follow the principle of flowing in the direction of the le...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26C09K8/514
CPCC09K8/514C09K2208/18E21B43/26
Inventor 郝瑞芬赵振峰李宪文马旭张燕明来轩昂古永红叶亮周长静马占国何明舫毕曼胡杨明史华丁勇高伟问晓勇李楼楼
Owner PETROCHINA CO LTD
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