Study Of Fracturing Reducer BCG

DRA is important for the commercial development of unconventional hydrocabon resources such as shale gas, coalbed methane and tight gas.Predominant linear guar gum or the abroad DRA products (such as J313) are used in China's major oil field fracturing,so it is necessary to study the localization of high-performance DRA. This paper which is based on the drag-reducing mechanism of polymer synthesizes a high performance DRA(the code name BCG) by reverse phase microemulsion polymerization. This paper mainly includes the following aspects:(1) Through theoretical analysis and molecular simulation technique determine the N-positive sixteen alkyl acrylamide as the long chain monomer in polymer.(2) Synthesize the the N-positive sixteen alkyl acrylamide (the code name long-chain monomer DB), and analyze the monomer by infrared spectroscopy, elemental analysis and NMR, the result indicate that it is the goal of the monomer N-positive sixteen alkyl acrylamide.(3) Choose the TW60 and SP80 as preparative reverse microemulsion emulsifier from four groups of emulsifier in the system which dispersion medium is 5# white oil, and research on the aqueous phase monomer concentration, emulsifier HLB value, accounting for the impact of the oil phase emulsifier content and the amount of electrolyte sodium acetate reverse microemulsion largest increase capacity, conductivity and stability. Determine the best formula of reverse microemulsion are water microemulsion phase monomer concentration of 46%, emulsifier HLB value of 7.7, representing the oil phase emulsifier mass fraction of 24%, accounting for the oil phase electrolyte sodium acetate mass fraction of 2% in this system.(4) Study respectively that the amount of initiator, the ratio between the initiator agent, the concentration of long-chain monomer DB and the reaction temperature affect to the synthetic polymer drag reduction rate, intrinsic viscosity, solids content, the dissolution time and stability in the (NH4)2S2O8-NaHSO3 and AIBA-AIBN two kinds of initiator, determine optimal conditions of reverse microemulsion polymerization are the total mass of the monomer initiator 0.3%; AIBA and AIBN mass ratio of 0.8:1; the polymerization temperature is 40?; the concentration of long-chain monomer DB 0.8%.(5) The DRA which is synthesized by optimal conditions of reverse microemulsion polymerization intrinsic viscosity is 23.34 dL.g-1, solids content is 45.78%, the dissolution time is 1.3 min, stability time exceed 60 days, weight average molecular weight is (8.74± 0.32)×106 g · mol-1, average particle diameter is 87.5 nm,when mass fraction of the DRA is 0.1%, drag reduction efficiency compared to water can reach 78.8% and 73.6% respectively in the inner diameter of 8mm and 10mm test pipeline, its drag reduction performance is as equal as foreign DRA products the J313.(6)The viscosity of the BCG can stay 5mPa·s after 100 minutes of continuous shear When the temperature is 333 k and the rate of shear is 170s-1,viscosity retention rate is sixty percent,and the DRA,auxiliary drainage agent DB-80 and inorganic anti swelling agent KCl have well compatibility, the DRA can be applied to slippery water fracturing fluid.