下古碳酸盐岩储层泥浆污染解堵配方研究
发布时间：2018-08-14 09:12
【摘要】：针对油气田碳酸盐岩超低渗透储层钻井泥浆污染长期存在的问题,在实验室研究了有针对性的解堵剂配方。通过分析4口井的岩芯和3口井不同井深的泥浆的理化性质,对储层伤害程度加以评价。研究发现,岩石主要成分为方解石和白云石,伴生少量粘土。泥浆对井壁的堵塞形态为无机物颗粒广泛分散在有机交联之间,于岩石表面形成泥饼;泥浆小颗粒分子较多,滤失进入缝隙降低渗透率。结合实验室研究,根据钻井泥浆的成分针对性测试了酸、氧化剂对泥浆的溶蚀情况,遴选了盐酸、氢氟酸、双氧水和乙酸几种试剂作为解堵液主酸。运用响应面实验进行分析,确定了在泥饼溶蚀中,影响因素过氧化氢盐酸氢氟酸乙酸;在岩芯溶蚀中,影响因素盐酸乙酸氢氟酸过氧化氢。商榷了解堵机理,认为盐酸和氢氟酸能够较好溶蚀岩芯横截面上和孔道缝隙中的无机物堵塞,过氧化氢和乙酸能够生成过氧乙酸,以破坏泥饼的交联结构。当泥饼被溶蚀殆尽,盐酸和氢氟酸的浓度降低,醋酸缓慢释放氢根继续温和地溶蚀岩芯,扩充油气通道;当醋酸逐渐消耗,不能提供更多氢根时,体系pH值上升,残余的氢氟酸生成氟化钙保护层。合成、评价和优选得到较佳的缓蚀剂、铁离子稳定剂、表面活性剂及粘土稳定剂等添加剂,分别为咪唑啉(MHA)、柠檬酸(CA)、十六烷基三甲基溴化铵(STAB)及胺类聚合物(AMSC)。通过岩芯污染-解堵实验,明确了各个主剂对岩心的渗透率没有明显伤害,具有较好的配伍性。同时优化了解堵液配方,为9%HCl+1.3%HF+5%H_2O_2+15%HAc+3‰STAB+5‰MHA+5‰CA+1.5%AMSC,其对岩芯渗透率的恢复达到130%。
[Abstract]:Aiming at the long-term problem of drilling mud contamination in carbonate ultra-low permeability reservoir of oil and gas field, the formulation of plug removal agent was studied in laboratory. The damage degree of reservoir was evaluated by analyzing the physical and chemical properties of mud in cores of 4 wells and mud in different depths of 3 wells. The plugging form of mud to wellbore is that inorganic particles are widely dispersed between organic crosslinks and form mud cakes on the surface of rock; small particles of mud have more molecules and filter loss into crevices to reduce permeability. Hydrochloric acid, hydrofluoric acid, hydrogen peroxide and acetic acid were selected as the main acid in the plugging solution. Response surface methodology was used to analyze the factors affecting the corrosion of mud cake, such as hydrogen peroxide hydrofluoric acid, hydrofluoric acid hydrochloric acid and hydrogen peroxide hydrochloric acid. Hydrogen peroxide and acetic acid can form peracetic acid to destroy the cross-linking structure of mud cake. When the mud cake is dissolved, the concentration of hydrochloric acid and hydrofluoric acid decreases, and the slow release of hydrogen from acetic acid continues to gently dissolve the core, expanding the oil and gas channel; when acetic acid gradually dissipates, the concentration of hydrochloric acid and hydrofluoric acid decreases. When more hydrogen is consumed, the pH value of the system rises and the residual hydrofluoric acid forms a protective layer of calcium fluoride. Better corrosion inhibitors, iron ion stabilizers, surfactants and clay stabilizers are synthesized, evaluated and optimized, such as imidazoline (MHA), citric acid (CA), cetyltrimethylammonium bromide (STAB) and amine polymers (A). MSC). Through the core contamination-plugging removal test, it is clear that the main agents have no obvious damage to the core permeability and good compatibility. At the same time, the plugging fluid formula is optimized and understood, which is 9% HCl+1.3% HF+5% H 2O 2+15% HAc+3 STAB+5 MHA+5 CA+1.5% AMSC. The recovery of core permeability reaches 130%.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE258
本文编号：2182387
[Abstract]:Aiming at the long-term problem of drilling mud contamination in carbonate ultra-low permeability reservoir of oil and gas field, the formulation of plug removal agent was studied in laboratory. The damage degree of reservoir was evaluated by analyzing the physical and chemical properties of mud in cores of 4 wells and mud in different depths of 3 wells. The plugging form of mud to wellbore is that inorganic particles are widely dispersed between organic crosslinks and form mud cakes on the surface of rock; small particles of mud have more molecules and filter loss into crevices to reduce permeability. Hydrochloric acid, hydrofluoric acid, hydrogen peroxide and acetic acid were selected as the main acid in the plugging solution. Response surface methodology was used to analyze the factors affecting the corrosion of mud cake, such as hydrogen peroxide hydrofluoric acid, hydrofluoric acid hydrochloric acid and hydrogen peroxide hydrochloric acid. Hydrogen peroxide and acetic acid can form peracetic acid to destroy the cross-linking structure of mud cake. When the mud cake is dissolved, the concentration of hydrochloric acid and hydrofluoric acid decreases, and the slow release of hydrogen from acetic acid continues to gently dissolve the core, expanding the oil and gas channel; when acetic acid gradually dissipates, the concentration of hydrochloric acid and hydrofluoric acid decreases. When more hydrogen is consumed, the pH value of the system rises and the residual hydrofluoric acid forms a protective layer of calcium fluoride. Better corrosion inhibitors, iron ion stabilizers, surfactants and clay stabilizers are synthesized, evaluated and optimized, such as imidazoline (MHA), citric acid (CA), cetyltrimethylammonium bromide (STAB) and amine polymers (A). MSC). Through the core contamination-plugging removal test, it is clear that the main agents have no obvious damage to the core permeability and good compatibility. At the same time, the plugging fluid formula is optimized and understood, which is 9% HCl+1.3% HF+5% H 2O 2+15% HAc+3 STAB+5 MHA+5 CA+1.5% AMSC. The recovery of core permeability reaches 130%.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE258
【引证文献】
相关期刊论文 前1条
1 张群正;刘金磊;孙淑娟;周慧鑫;杨萌;白永强;;控流管路中降滤失剂的合成与性能研究[J];钻井液与完井液;2017年03期
，本文编号：2182387
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