Clean polymer-free carrier fluid

Abstract

The invention provides clean polymer-free carrier fluid, which is characterized by mainly comprising the following components in percentage by weight: 0.5 to 15 percent of surfactant, 0.2 to 2 percent of cross-linking aid, 0.2 to 5 percent of stabilizing agent and the balance of solvent, wherein the surfactant is long-chain betaine surfactant, the cross-linking aid is organic acid salt, the stabilizing agent is long-chain alcohol, and the solvent is small molecular alcohol solution. The clean polymer-free carrier fluid effectively overcomes the defects of low effective content of primary agents and difficult liquid preparation, solves the problem of non-uniform dispersion of a propping agent, and has the characteristics of strong viscous elasticity, high suspension property, multiple functions, expanding prevention and difficult deterioration.

Description

technical field [0001] The invention relates to an entry fluid for downhole fracturing operations in oil production, in particular to a clean polymer-free sand-carrying fluid. Background technique [0002] With the development of oil fields and the enhancement of people's awareness of environmental protection, people are aware of the damage caused by conventional acidizing operations to the formation, and sand control operations have been paid more and more attention. In the sand control process, squeeze filling and fracturing sand control have become the main processes in the field of sand control due to their good sand control effect and long validity period. The sand-carrying fluid used for sand control uses pressure to press the formation to form fractures and support it with proppant. Because of such supported fractures in the oil layer, the liquid flow channel in the oil layer near the wellbore is improved, and the drainage capacity is increased. The flow area reduces...

AI Technical Summary

Problems solved by technology

[0003] 1. The water lock damage caused by the sand-carrying liquid entering the formation, the compatibility with the formation water and the permeability damage caused by the residue after breaking the gel;

[0004] 2. The sand-carrying liquid itself needs to add a large amount of formaldehyde for anti-corrosion due to the problem of easy corruption;

[0007] 1. The water lock damage caused by the sand-carrying liquid entering the formation, the compatibility with the formation water and the permeability damage caused by the residue after breaking the gel;

[0008] 2. The sand-carrying liquid itself needs to add a large amount of formaldehyde for anti-corrosion due to the problem of easy corruption;

Even if the main agent is in a large concentration (5%), under the condition of suitable additive type and ratio, its viscosity value at high temperature is low, and it is difficult to meet the requirements of high temperature sand carrying performance

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