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A guiding agent for controlling the height of the lower end of hydraulic fracture extension

A technology of hydraulic fracturing and directing agent, which is applied in wellbore/well components, production fluid, earthwork drilling and production, etc. It can solve the problems that cannot meet the needs of large-scale fracturing construction, artificial barriers have insufficient pressure bearing capacity, and cannot control cracks. Extension and other issues

Active Publication Date: 2018-11-30
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the performance test results and field construction conditions of the current sinking directing agent, it is found that the existing sinking directing agent system cannot meet the current large-scale fracturing construction requirements for low-porosity and low-permeability reservoirs. The pressure bearing capacity of the artificial barrier formed by the directing agent is not enough to control the invalid extension of the crack downward

Method used

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  • A guiding agent for controlling the height of the lower end of hydraulic fracture extension
  • A guiding agent for controlling the height of the lower end of hydraulic fracture extension

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First premix 25kg of barite powder and 4.5kg of polyether nonionic surfactant; then add 20kg of glycidyl ether epoxy resin into the mixer, slowly heat to 90~120°C, and put the premixed heavy Add spar powder and polyether non-ionic surfactant into the mixer and stir; then add 5.5kg polypropylene fiber filler, after the filler is completely dispersed, add 35kg polyethylene terephthalate, and finally add 10kg ethylene glycol The amine is then extruded and granulated to obtain controlled lower-end directing agent granules.

Embodiment 2

[0020] First, premix 15kg of barite powder and 2kg of polyether nonionic surfactant; then add 40kg of glycidyl ester epoxy resin into the mixer, slowly heat to 90~120℃, and premix the recrystallized Add stone powder and polyether nonionic surfactant into the mixer, stir; then add 3kg of asbestos fiber filler, after the filler is completely dispersed, add 20kg of polybutylene terephthalate, and finally add 20kg of propylenediamine, Then extrude and granulate to obtain the controlled lower end directing agent granules.

Embodiment 3

[0022] First, premix 30kg calcium carbonate powder and 6kg polyether nonionic surfactant; then add 20kg glycidyl ether epoxy resin into the mixer, slowly heat to 90~120℃, and premix the calcium carbonate powder and glycidyl ester epoxy resin into the mixer, stirring; then add 6kg of asbestos fiber filler, after the filler is completely dispersed, add 28kg of polyethylene terephthalate, and finally add 10kg of hexamethylenediamine, and then squeeze Press and granulate to obtain controlled lower-end directing agent granules.

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Abstract

The invention discloses a guiding agent for controlling extension lower end height of a hydraulic fracturing crack. The guiding agent is prepared from the following components by weight percent: 20-40% of a dispersing agent, 10-20% of a curing agent, 20-40% of a bridging agent, 15-30% of a weighting agent, 2-6% of a softening agent and 2-6% of filler, wherein the dispersing agent is one or two ofglycidyl ether epoxy resin and glycidyl ester epoxy resin mixed at any ratio; the curing agent is quadrol, propane diamine or hexamethylenediamine; the bridging agent is one or two of polyethylene terephthalate and polybutylene terephthalate mixed at any ratio; the weighting agent is calcium carbonate or barite powder; the softening agent is a polyether nonionic surfactant with weight-average molecular weight within 500-1000; the filler is one or two of asbestos fiber and polypropylene fiber mixed at any ratio. After the guiding agent enters into a stratum, the guiding agent quickly settles tothe lower end of the crack and immerses into micro-crack and gap, so that the crack cannot continue extending to the lower end and the fracturing construction efficiency is increased.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas development, and in particular relates to a guiding agent for controlling the height of the extended lower end of hydraulic fracturing cracks in oil and gas production stimulation. Background technique [0002] In recent years, with the continuous advancement of oil and gas exploration and development, the proportion of low-permeability reserves in the newly added oil and gas reserves is also increasing. Therefore, how to further improve the development efficiency of the developed low-permeability oil and gas fields, and how to put the undeveloped low-permeability oil and gas reserves into development as soon as possible and effectively is of great significance to the sustainable and stable development of my country's oil and gas energy industry. [0003] Hydraulic fracturing is an indispensable and important technical measure for the development of low-permeability reservoirs and the stim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/80
Inventor 王世彬李杨郭建春王坤杰
Owner SOUTHWEST PETROLEUM UNIV