【摘要】：針對油氣田碳酸鹽巖超低滲透儲層鉆井泥漿污染長期存在的問題,在實(shí)驗(yàn)室研究了有針對性的解堵劑配方。通過分析4口井的巖芯和3口井不同井深的泥漿的理化性質(zhì),對儲層傷害程度加以評價。研究發(fā)現(xiàn),巖石主要成分為方解石和白云石,伴生少量粘土。泥漿對井壁的堵塞形態(tài)為無機(jī)物顆粒廣泛分散在有機(jī)交聯(lián)之間,于巖石表面形成泥餅;泥漿小顆粒分子較多,濾失進(jìn)入縫隙降低滲透率。結(jié)合實(shí)驗(yàn)室研究,根據(jù)鉆井泥漿的成分針對性測試了酸、氧化劑對泥漿的溶蝕情況,遴選了鹽酸、氫氟酸、雙氧水和乙酸幾種試劑作為解堵液主酸。運(yùn)用響應(yīng)面實(shí)驗(yàn)進(jìn)行分析,確定了在泥餅溶蝕中,影響因素過氧化氫鹽酸氫氟酸乙酸;在巖芯溶蝕中,影響因素鹽酸乙酸氫氟酸過氧化氫。商榷了解堵機(jī)理,認(rèn)為鹽酸和氫氟酸能夠較好溶蝕巖芯橫截面上和孔道縫隙中的無機(jī)物堵塞,過氧化氫和乙酸能夠生成過氧乙酸,以破壞泥餅的交聯(lián)結(jié)構(gòu)。當(dāng)泥餅被溶蝕殆盡,鹽酸和氫氟酸的濃度降低,醋酸緩慢釋放氫根繼續(xù)溫和地溶蝕巖芯,擴(kuò)充油氣通道;當(dāng)醋酸逐漸消耗,不能提供更多氫根時,體系pH值上升,殘余的氫氟酸生成氟化鈣保護(hù)層。合成、評價和優(yōu)選得到較佳的緩蝕劑、鐵離子穩(wěn)定劑、表面活性劑及粘土穩(wěn)定劑等添加劑,分別為咪唑啉(MHA)、檸檬酸(CA)、十六烷基三甲基溴化銨(STAB)及胺類聚合物(AMSC)。通過巖芯污染-解堵實(shí)驗(yàn),明確了各個主劑對巖心的滲透率沒有明顯傷害,具有較好的配伍性。同時優(yōu)化了解堵液配方,為9%HCl+1.3%HF+5%H_2O_2+15%HAc+3‰STAB+5‰MHA+5‰CA+1.5%AMSC,其對巖芯滲透率的恢復(fù)達(dá)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%.
【學(xué)位授予單位】：西安石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TE258

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1 張群正;劉金磊;孫淑娟;周慧鑫;楊萌;白永強(qiáng);;控流管路中降濾失劑的合成與性能研究[J];鉆井液與完井液;2017年03期

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