High temperature and anti-composite salt polymer fluid loss reducer for drilling fluid and preparation method thereof

Abstract

The invention provides a fluid loss agent for a high-temperature-resistant compound salt resistant polymer for drilling fluid and a preparation method thereof. The fluid loss agent consists of the following raw materials in percentage by weight: 10-15 percent of acrylic acid, 6-8.5 percent of sodium hydroxide, 60-65 percent of deionized water, 4-8 percent of acrylamide, 5-6 percent of tetraphenyl ethylene sodium sulfonate, 6-8 percent of N-vinyl pyrrolidone and 0.1-0.5 percent of initiator. Compared with the prior art, the fluid loss agent has the beneficial effects that the high-temperature high-pressure filter loss of the drilling fluid can be obviously reduced, and the temperature resistance and salt calcium pollution resistance of the drilling fluid system are entirely improved. Moreover, the mud cake quality is improved, a permeability recovery rate is increased, and a hydrocarbon reservoir is effectively protected. The fluid loss agent can resist high temperature of 180 DEG C and compound salts and can serve as a fluid loss agent of deep walls, drilled evaporite beds and seawater drilling.

Description

technical field [0001] The invention relates to a fluid loss reducer, in particular to a fluid loss reducer for high temperature and compound salt polymers used in drilling fluids and a preparation method thereof. Background technique [0002] As the drilling depth of oil and gas wells increases, the temperature and pressure at the bottom of the well continue to rise, and the requirements for drilling fluid treatment agents are getting higher and higher. Due to the complex strata encountered in ultra-deep wells, downhole high temperature and high pressure, and long operating periods, higher requirements are placed on drilling fluid technology. The main technical problems faced by drilling fluids for high-temperature ultra-deep wells are as follows: First, the high-temperature stability of drilling fluids is particularly prominent. Because under the action of high temperature, the main organic treatment agents in drilling fluid can gradually deteriorate, degrade and become i...

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Problems solved by technology

[0004] The present invention proposes a high temperature and anti-composite salt polymer fluid loss reducer for drilling fluids and a preparation method thereof, which solves the deficiencies in the prior art. Due to the defects of salt and poor high temperature resistance, acrylic acid, acrylamide, sodium tetraphenylethylene sulfonate and N-vinylpyrrolidone (NVP) were used as modified monomers to synthesize a high temperature resistant compound salt tetrapolymer to reduce water loss. agent

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