Study On The Synthesis And Performance Of Fluid Loss Additive Available

With the continuous reduction of oil reserves,exploration and development of oilfield mining have been faced to ultra-deep wells,marine and other aspects.The world's marine area is much larger than the land area,the amount of oil can be mined in the seabed,so more and more attention has been paid to the exploitation of offshore oil fields at home and abroad,cementing in the sea generally used with water slurry.Cations in seawater can affect the basic properties of oil well cement,which brings more challenges to cementing construction.Cement slurry needs to cooperate with the oil well cement additives to use,in order to meet its performance indicators,fluid loss additive is an important oil well cement additives.The cement with fluid loss additive can be used to control the loss of water and to prevent the filtrate to the formation of leakage pollution stratigraphy.At present,there are few studies on fluid loss additive for seawater cement slurry system,and the contradictory relationship between water loss and dispersibility of cement paste is prevalent.Aimed at those problems mentioned above,through referring to the relevant literature.A new fluid loss additive,namely AMDA was synthesized by2-acrylamide-2-methyl propane sulfonic acid,maleic anhydride,N,N-dimethyl acrylamide,Allyl alcohol polyoxyethylene ether(APEG).The quadripolymer were synthesized by free radical polymerization in a water solution,used for sea-water based cement slurry system.Moreover,optimum formula and reaction condition were acquired through the investigation of polymerization condition.The performances of cement slurry with the AMDA were investigated.The AMDA was identified by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance spectroscopy.The characterizations showed that the prepared product was the target product.The AMDA was resolved when the temperature reached 277 ? though TG analysis,exhibiting excellent thermal stability.The comprehensive application performance of fluid loss additive was investigated in cement slurry.The result revealed that the copolymer has good fluid loss control ability.When the AMDA was at 3% dosage,the API value can becontrolled within 50 ml in the seawater and fresh water slurry system;the fluid loss additive has good fluidity and mobility retention in seawater slurry system.At the temperature of 30?,60? and 90?,AMDA has no effect on the compressive strength of seawater and freshwater cement;The undesirable phenomenon like “false set” or “abmormal gel” was not observed in the thickening curve.In this paper,the development of solid fluid loss additive and liquid fluid loss additive in the application of cement slurry performance significantly different,The phenomena were studied by scanning electron microscopy,transmission electron microscopy and Zeta potential and particle size analyzer.The results show that the solid fluid loss additive is not sensitive to seawater cement slurry system and is more suitable for seawater slurry system.