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Method for maintaining flow conductivity of multi-slit fracturing seams in horizontal well section

A technology that maintains the level and conductivity, and is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc. It can solve the problem that the temporary plugging agent is not effective in blocking, the well section cannot be effectively reformed, and the plugging effect is not effective. Not good and other problems, to achieve the effect of improving the laying effect, improving the success rate of temporary plugging, and improving the plugging effect

Active Publication Date: 2016-06-08
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

[0030] In order to overcome the problems existing in the prior art, this embodiment provides a method for maintaining the fluid conductivity of multi-fracture fracturing openings in a horizontal well section, including the following steps:

[0031] 1) First determine the working fluid for temporary plugging diversion, which includes: by volume percentage, 8.5% degradable temporary plugging agent, 8.5% proppant, 8.5%-17% degradable fiber and 66%-74.5% low Viscous carrier fluid, according to the Young's modulus of different gas field reservoirs to determine the particle size combination of degradable temporary plugging agent, when the Young's modulus is less than 25000MPa, all use large particle size degradable temporary plugging agent, when Young's modulus When the modulus is 25,000-30,000MPa, the small particle size degradable temporary plugging agent accounts for 70%, and the large particle size degradable temporary plugging agent accounts for 30%. 30%, large particle size de...

Embodiment 2

[0037]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 0.1-1mm, and the particle size range of the degradable temporary plugging agent with large particle size is 1-10mm. 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 0.1-1mm is filled Among the large particle size degradable temporary plugging agents, the plugging effect can be effectively and rapidly improved, and the mixing ratio is optimized and determined according to the characteristics of...

Embodiment 3

[0041] This embodiment provides a method for maintaining the fluid conductivity of multi-fracture fracturing openings in a horizontal well section, including the following steps:

[0042] 1) First determine the working fluid for temporary plugging diversion, which includes: by volume percentage, 8.5% degradable temporary plugging agent, 8.5% proppant, 8.5%-17% degradable fiber and 66%-74.5% low Viscous carrier fluid, according to the Young's modulus of different gas field reservoirs to determine the particle size combination of degradable temporary plugging agent, when the Young's modulus is less than 25000MPa, all use large particle size degradable temporary plugging agent, when Young's modulus When the modulus is 25,000-30,000MPa, the small particle size degradable temporary plugging agent accounts for 70%, and the large particle size degradable temporary plugging agent accounts for 30%. 30%, large particle size degradable temporary plugging agent accounted for 70%;

[0043...

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PUM

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Abstract

The invention relates to a method for maintaining flow conductivity of multi-slit fracturing seams in a horizontal well section. The method comprises the steps of firstly, preparing a temporary plugging steering working solution, wherein the temporary plugging steering working solution comprises degradable temporary plugging agents, degradable fiber, an equidensity proppant and a low-viscosity carrying liquid; carrying out staged fracturing, wherein the pump injection sequence is a prepad fluid, a sand-carrying fluid and the temporary plugging steering working solution; and after complete fracturing, waiting till the temporary plugging steering working solution is degraded, carrying out fluid drainage, and ensuring that the proppant remains at the seams and forms a seepage channel. According to the method, the plugging efficiency is improved and the seepage loss of liquids among the seams is reduced through adopting the multi-scale degradable temporary plugging agents; after construction, the degradable temporary plugging agents and the degradable fiber in the temporary plugging steering working solution are completely degraded under the action of the bottom hole temperature; the proppant maintains the flow conductivity of a near mineshaft; and the method is applicable to conventional hydraulic fracturing staged reconstruction, unconventional staged fracturing reconstruction, uncrushed perforation cluster reconstruction of a new well, repeated fracturing reconstruction of an old well, and various technologies of staged reconstruction of a horizontal well.

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 maintaining the flow conductivity of multi-fracture fracturing openings in the horizontal well section. 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 th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 郝瑞芬赵振峰李宪文马旭叶亮张燕明来轩昂古永红周长静马占国何明舫毕曼胡杨明史华高伟问晓勇李楼楼
Owner PETROCHINA CO LTD
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