Plant gum fracturing fluid and method for recycling flow-back fluid of plant gum fracturing fluid

Abstract

The invention discloses plant gum fracturing fluid and a method for recycling flow-back fluid of the plant gum fracturing fluid. The method for recycling the flow-back fluid of the plant gum fracturing fluid comprises the steps of firstly, preparing 99.82-61.2 parts of clean water, 0.15-0.8 part of hybrid fenugreek gelatin powder, 0-1.0 part of a crude oil demulsifier, 0-2.0 parts of a discharge aiding agent, 0-2.0 parts of a foaming agent, 0-1.0 part of a sterilizing agent, 0-2.0 parts of a clay stabilizer, 0-10.0 parts of a pH value regulator and 0.03-20.0 parts of borate into clean water based fracturing fluid, and then performing fracturing construction; then, separating crude oil and solid-phase particles in the fracturing fluid after fracturing construction to obtain a low-back fluid clear solution; preparing 20-99.98 parts of the low-back fluid clear solution, 0-36.2 parts of clean water, 0.01-5.0 parts of a calcium-magnesium shielding agent, 0-0.8 part of the hybrid fenugreek gelatin powder, 0-1.0 part of the crude oil demulsifier, 0-2.0 parts of the discharge aiding agent, 0-2.0 parts of the foaming agent, 0-1.0 part of the sterilizing agent, 0-2.0 parts of the clay stabilizer, 0.01-10.0 parts of the pH value regulator and 0-20.0 parts of borate into flow-back fluid based fracturing fluid, and performing fracturing construction again; finally, continuously recycling the flow-back fluid after fracturing according to the proportion of the flow-back fluid based fracturing fluid.

Description

technical field [0001] The invention relates to the field of recovery of fracturing fluid and flowback fluid used in oil and gas wells including shale gas and coalbed gas fracturing stimulation processes, specifically using hybrid fenugreek powder as a thickener A vegetable gum fracturing fluid and a method for recycling the flowback fluid thereof. [0002] Background technique [0003] In the fracturing process of oil and gas wells, the fracturing fluids used in the prior art are mainly fracturing fluids with high molecular weight plant gums such as guar gum and its derivatives as thickeners, which generally have the following disadvantages: [0004] 1. Because the gel breaker must be used in the fracturing fluid, the gel breaker always reduces the viscosity of the fracturing fluid during the fracturing process, which affects the reliability of the construction. [0005] 2. The filter cake formed by the fracturing fluid in the formation and the concentrated soluti...

AI Technical Summary

Problems solved by technology

[0005] 1. Because the gel breaker must be used in the fracturing fluid, the gel breaker always reduces the viscosity of the fracturing fluid during the fracturing process, which affects the reliability of the construction

[0006] 2. The filter cake formed by the fracturing fluid in the formation and the concentrated solution around it cannot break the gel or only partially break the gel, and polymers are likely to remain in the support fractures of the formation, causing serious pollution to the support fractures

[0007] 3. The fracturing fluid must be returned to the ground after the fracturing construction is completed. The returned liquid cannot be reused. If it is not treated effectively, it will easily pollute the environment

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