甲酸钾无固相钻井液增粘剂的制备及其体系研究

发布时间：2018-03-30 01:22

  本文选题：无固相　切入点：钻井液　出处：《西南石油大学》2015年硕士论文

【摘要】：无固相钻井液是由可溶性盐与聚合物增粘剂等组成的无粘土相的钻井液,它能够避免因粘土矿物等固相在筛管完井中对固井质量的影响及储层的损害。增粘剂是无固相钻井液中重要的组成部分,它是维持钻井液悬浮和携带岩屑性能的根本保障。本文主要研制一种高效增粘、耐温耐盐的增粘剂,并研制密度可调的甲酸钾无固相钻井液体系。 通过对目标产物分子的结构设计、单体的选择以及合成可行性分析,确定以非离子单体丙烯酰胺(AM)、阴离子单体2-丙烯酰胺基-2-甲基丙磺酸(AMPS)以及阳离子单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)为合成单体,在过硫酸铵与亚硫酸氢钠氧化-还原引发体系下进行水溶液聚合,合成三元共聚物(PADA)。通过单因素法对产物的表观粘度与特性粘度的测定,确定最佳的反应合成条件：引发剂过硫酸铵与亚硫酸氢钠质量比为2：1,单体质量配比为AM:AMPS:DMC=8:2:1,单体质量总浓度为30%,引发体系加量为单体总质量的0.5%,体系pH为7,反应温度45℃,反应时间4h。对PADA结构进行红外光谱、核磁共振氢谱表征,对PADA溶液的流变性能进行了评价。 通过对加入PADA增粘剂的无固相钻井液中加重剂、提切剂、暂堵剂、降滤失剂、页岩抑制剂以及润滑剂的筛选与优化,确定了甲酸钾无固相钻井液的配方体系：清水+10%～50%甲酸钾(密度范围：1.05g/cm3-1.32g/cm3)+0.45%PADA+0.3%XC(提切剂)+3.5%超细碳酸钙+2%JX-JL(降滤失剂)+1.5%HLB(润滑剂)+2%JX-YZ(抑制剂)。对研制的甲酸钾钻井液进行评价,室内试验表明：甲酸钾钻井液的表观粘度适中,体系动切力与塑性粘度较高,滤失量小(FLAPI=4.8mL, FLHTHP=11.8mL),耐温能力达120℃,抗盐抗钙污染能力强,抗固相污染能力强,润滑性能好,极压润滑系数0.075,页岩滚动回收率达90%以上,能够实现油气储层保护。 通过对甲酸钾无固相钻井液破胶体系研究,确定破胶体系配方：KCl混合盐水+4%破胶剂JX-GB+2%粘土稳定剂HCS。
[Abstract]:Solid-free drilling fluid is a non-clay phase drilling fluid consisting of soluble salt and polymer tackifier. It can avoid the influence of clay minerals and other solids on cementing quality and reservoir damage in sieve tube completion, and tackifier is an important part of solids free drilling fluid. It is the fundamental guarantee to maintain the properties of drilling fluid suspension and cuttings carrying. In this paper, a kind of viscosity improver with high viscosity, temperature and salt resistance, and a solid free drilling fluid system with adjustable density are developed. Based on the structural design of the target product molecule, the selection of monomer and the feasibility analysis of synthesis, The synthetic monomers were composed of non-ionic monomer acrylamide, anionic monomer 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and cationic monomer methacryloxy ethyl trimethylammonium chloride (DMCs). The terpolymer was synthesized by aqueous solution polymerization in the system of ammonium persulfate and sodium bisulfite redox initiator. The apparent viscosity and intrinsic viscosity of the product were determined by single factor method. The optimum reaction conditions were determined as follows: the mass ratio of ammonium persulfate to sodium bisulfite was 2: 1, the mass ratio of monomer to ammonium persulfate was 2: 1, the mass ratio of monomer to ammonium persulfate was 8: 2: 1, the mass concentration of monomer was 30%, the amount of initiator was 0.5% of the total mass of monomer, the pH of the system was 7, the reaction temperature was 45 鈩，

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