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Relieving agent for fluid resistance effect of shale gas, preparation method and application thereof

A technology for shale gas and shale oil and gas, applied in the field of liquid resistance effect release agent for shale gas, which can solve the problems of no oil and gas output, reduce the production of oil and gas wells, increase the seepage resistance near the wellbore, and achieve low cost , increase oil and gas production, and promote the effect of flowback

Inactive Publication Date: 2017-12-08
陕西森瑞石油技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water lock damage will greatly increase the seepage resistance in the near-well zone, reduce the production of oil and gas wells, and even lead to no production of oil and gas in severe cases

Method used

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  • Relieving agent for fluid resistance effect of shale gas, preparation method and application thereof
  • Relieving agent for fluid resistance effect of shale gas, preparation method and application thereof
  • Relieving agent for fluid resistance effect of shale gas, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This example provides a preferred liquid resistance effect release agent composition, denoted as 1# release agent, in terms of mass percentage, the proportion of the feeding amount of each component is: fluorocarbon surfactant 8%, dodecane Dimethyl benzyl ammonium chloride 8%, disodium hydroxyethylidene diphosphonate 2%, polyamino polyether methylene phosphonic acid 2%, water 80%. The fluorocarbon surfactant of this embodiment is selected from TF-1 fluorocarbon surfactant.

[0022] Preparation method: After weighing 80kg of solvent water, pump a sufficient amount into the reaction kettle, then put 8kg of TF-1 fluorocarbon surfactant into the reaction kettle, start stirring, and the stirring speed can be adjusted appropriately; slowly add dodecyl 8 kg of dimethyl benzyl ammonium chloride, 2 kg of disodium hydroxyethylidene diphosphonate, and 2 kg of polyamino polyether methylene phosphonic acid were stirred at room temperature for 1 hour to prepare the liquid resistance ...

Embodiment 2

[0024] This embodiment provides a preferred composition of liquid resistance effect release agent, which is recorded as 2# release agent. In terms of mass percentage, the proportion of the feeding amount of each component is: 9% of fluorocarbon surfactant, 9% of dodecane Dimethyl benzyl ammonium chloride 9%, disodium hydroxyethylidene diphosphonate 2.5%, polyamino polyether methylene phosphonic acid 2.5%, water 77%. The fluorocarbon surfactant of the present embodiment selects SR18Y fluorocarbon surfactant for use.

[0025] Preparation method: After weighing 77kg of solvent water, pump a sufficient amount into the reaction kettle, then put 9kg of SR18Y fluorocarbon surfactant into the reaction kettle, start stirring, and the stirring speed can be adjusted appropriately; slowly add dodecyl dimethyl 9 kg of benzyl ammonium chloride, 2.5 kg of disodium hydroxyethylidene diphosphonate, 2.5 kg of polyamino polyether methylene phosphonic acid, and stirred for 1 hour at room temperat...

Embodiment 3

[0027] This embodiment provides a preferred composition of liquid resistance effect release agent, which is recorded as 3# release agent. In terms of mass percentage, the proportion of the feeding amount of each component is: 10% of fluorocarbon surfactant, 10% of dodecane Dimethyl benzyl ammonium chloride 10%, disodium hydroxyethylidene diphosphonate 3%, polyamino polyether methylene phosphonic acid 3%, water 74%. The fluorocarbon surfactant of the present embodiment selects SR18Y fluorocarbon surfactant for use.

[0028] Preparation method: After weighing 74kg of solvent water, pump a sufficient amount into the reaction kettle, then put 10kg of SR18Y fluorocarbon surfactant into the reaction kettle, start stirring, and the stirring speed can be adjusted appropriately; slowly add dodecyl dimethyl 10 kg of benzyl ammonium chloride, 3 kg of disodium hydroxyethylidene diphosphonate, 3 kg of polyamino polyether methylene phosphonic acid, and stirred for 1 hour at room temperature...

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Abstract

The invention belongs to the technical field of oil and gas field chemistry and discloses a relieving agent for fluid resistance effect of shale gas. The relieving agent is prepared from the following components by weight percent: 8%-10% of fluorocarbon surfactant, 8%-10% of dodecyl dimethyl benzyl ammonium chloride, 2%-3% of disodium hydroxyethyl diphosphonate, 2%-3% of methylene phosphonic acid and 74%-80% of water. The relieving agent is used for preventing or relieving the aqueous phase harm generated in the cracking or water injection process of the shale oil and gas reservoir; the additive amount is 0.5%-1% of the dosage of a fracturing fluid in the cracking process; the additive amount is 1%-2% of the water injection volume in the water injection process; and the principle of adding in stages is adopted. The relieving agent has the characteristics of low dosage, neutral nature, strong effect, environmental protection, and the like, is capable of effectively preventing and relieving the water blocking harm generated in the cracking process of the shale oil and gas reservoir, is capable of promoting the cracking capacity and is capable of protecting natural gas reservoir.

Description

technical field [0001] The present invention belongs to the technical field of oil and gas field chemistry. phase damage, improve fracturing productivity, and protect natural gas reservoirs. Background technique [0002] At present, the proportion of shale oil and gas field development is increasing. Shale oil and gas reservoirs are characterized by high capillary pressure, strong water sensitivity, poor permeability, complex structure, serious heterogeneity, and natural fractures. When the initial water saturation of this type of reservoir is lower than the irreducible water saturation, there is excess capillary pressure, and when foreign fluid enters, capillary self-absorption is easy to occur, and the foreign fluid that invades the reservoir is difficult to flow back , and even cannot flow back, forming water lock damage. [0003] The water lock effect is a phenomenon in which the permeability of the oil and gas phase near the wellbore decreases when drilling fluids, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/68C09K8/86
CPCC09K8/584C09K8/68C09K8/86
Inventor 李养池张永生桂宝玲田义陈杰罗春龙
Owner 陕西森瑞石油技术开发有限公司