Clean polymer-free carrier fluid

A sand-carrying liquid and cleaning technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as difficult to meet high-temperature sand-carrying performance, damage to residue permeability, easy corruption of sand-carrying liquid, etc., and achieve good carrying capacity Sand ability, uniform dispersion reduction, and the effect of increasing sand concentration

CN101831284AInactive Publication Date: 2010-09-15东营利丰化工新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-09-15
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0032] The invention discloses a novel surfactant for thickening, which belongs to the long-chain betaine surfactant,

[0033] It is a common amphoteric surfactant with the chemical formula:

[0034]

[0035] Among them, R 1 for C 16 -C 22 Hydrocarbyl, which can be linear or branched, stable or unstable; R 2 and R 3 for C 1 -C 4 Hydrocarbyl, can also be substituted by other groups, such as -OH. The following types of betaine-type surfactants can be used: cetyl dimethyl betaine, octadecyl dimethyl betaine, eicosyl dimethyl betaine, tallow diethyl betaine Wait. The basic dosage is 0.5%-15%. The specific dosage in field use depends on the performance requirements of the sand-carrying fluid. The optimized dosage is generally 2.0%-8%.

[0036] The introduction of the betaine group strengthens the biodegradability of the surfactant, has no toxic side effects on the environment, and reduces the adsorption amount of the formation, and the adsorption damage to the oil reser...