Fluid loss agent for drilling fluid

Abstract

The invention discloses a fluid loss agent for drilling fluid. A preparation method comprises the following steps of: adding 40g of deionized water into a reaction kettle, adding 2g of sodium carbonate into the kettle, stirring to dissolve the sodium carbonate, adding 5g of 2-acrylamide-2-methylpropenesulfonic acid into the solution for neutralization, pouring 15g of acrylamide and 0.6g of vinyl pyrrolidone into the neutralized solution in turn, stirring for dissolution, adding 0.1g of ammonium persulfate and 0.1g of sodium hydrogen persulfate into the solution in turn, stirring uniformly, transferring the solution to a kneading kettle for polymerization, pouring 2g of formaldehyde, 40g of sulfonated lignite and 40g of sulfomethylated phenolic resin into the kneading kettle, stirring uniformly, taking a polymerized material out, drying on drying equipment, crushing, and sieving by using an 80-mesh sieve. The fluid loss agent is suitable for various water base drilling fluids, high temperature deep wells and salt layers, and has the advantages of high temperature resistance and high salt resistance.

Description

Technical field: [0001] The invention relates to the control of drilling fluid properties, in particular to a drilling fluid fluid loss reducer with high temperature resistance and salt resistance. Background technique: [0002] In the process of oil drilling, the formations encountered are becoming more and more complex, especially in the case of more and more special wells, ultra-deep wells and complex wells. Poor, after increasing the amount of admixture, the viscosity will also increase, especially in the case of high calcium and magnesium ion content, the performance of drilling fluid is more difficult to control, the existing fluid loss control agent for drilling fluid can no longer meet the needs of drilling . Invention content: [0003] The object of the present invention is to provide a drilling fluid fluid loss reducer with good performance of high temperature resistance and salt resistance. [0004] The technical scheme of the present invention is accomplished...

AI Technical Summary

Problems solved by technology

[0002] In the process of oil drilling, the formations encountered are becoming more and more complex, especially in the case of more and more special wells, ultra-deep wells and complex wells. Poor, after increasing the amount of admixture, the viscosity will also increase, especially in the case of high calcium and magnesium ion content, the performance of drilling fluid is more difficult to control, the existing fluid loss control agent for drilling fluid can no longer meet the needs of drilling