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一种地下胶凝的深穿透低伤害盐酸酸化液 预览 被引量:4

A Clean Hydrochloric Acidizing Fluid of Deep Penetration and Low Damage owing to in-Situ Gelation at Elevated pH Value
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摘要 加有抗酸、抗盐特殊添加剂VPH-110(3%)、缓蚀剂、铁离子稳定剂、助排剂等的12%~20%盐酸液,鲜酸粘度很低,与岩石反应后pH≥2.5时可在酸蚀面上形成高粘度冻胶层,使后续酸液向深部穿透,转向低渗层;冻胶接触原油(烃类化合物)时彻底破胶,破胶后的乏酸粘度低,易返排.给出了基本配方.测定了加入VPH-110等的20%盐酸液的性能与常规的5%盐酸液进行了比较.与大理石反应后的VPH-110酸液25℃时的粘度,pH=0.5时为4mPa@s,pH=2.5时达到1440 mPa@s,pH>2.5时高粘度基本不变.在渗透率低且级差不大的两组平行三岩心实验中(渗透率约为0.05,0.04,0.031μm2),VPH-110酸液提高中、低渗透岩心渗透率的幅度及产生的酸蚀孔洞长度均远大于常规酸液,VPH-110酸液的注入压力通过极大值,指示深度穿透和转向的发生.pH=7的VPH-110乏酸冻胶破胶液对高、中、低渗岩心渗透率的伤害率仅分别为0,1.57%和0.79%,在20~80℃下的粘度与常规乏酸液大体相当.图3表2参3. The titled acidizing fluid containing 12-20% HCl is prepared with an acid and salts tolerant unique additive VPH 110 (3%), corrosion inhibitor, Fe ions stabilizer, backflow aid and other additives introduced. It is characterized by specific performance: the fresh acid has low viscosity and forms highly viscous gel on etched rock surfaces at pH≥2.5 in acid rock reaction processes which forces the fresh acid squeezed to penetrate more deeply and diverts the acid to lower permeable zones; the gel entirely breaks down in contact with the reservoir crude (hydrocarbons) and turns to thin spent acid easily flown out of the zones treated. The basic formulations are given. The performance properties of a VPH 110 treated 20% HCl acid of a standard formula (VPH 110 acid) are investigated in comparison with a common 5% HCl acid of normal formula (HCl acid). VPH 110 acid of pH=0.5 has viscosity 4 mPa·s, of pH=2.5 - viscosity 1 440 mPa·s and this high viscosity is kept unchanged at pH>2.5. In experiments on 2 sets of 3 parallel cores of low permeability and small permeability difference (0.05,0.04 and 0.03 μm 2 approximately),treating medium and low permeable cores with VPH 110 acid results in more increase in permeability and much longer acid passages than that by HCl acid and the injecting pressure of VPH 110 acid goes through a maximum, indicating deep peretration and diverting. The permeability damage rate caused by broken down spent VPH 110 acid of pH=7 accounts only 0,1.57%, and 0.79% for the high, medium and low permeable cores, respectively. Similar viscosities are observed at 20-80℃ for spent VPH 110 acid and HCl acid of pH=7.
作者 周福建 熊春明 刘玉章 李向东 黎红 孙乐臻 卢云霄 孟伟斌 ZHOU Fu Jian 1, XIONG Chun Ming 1, LIU Yu Zhang 1, LI Xiang Dong 1, LI Hong 2, SUN Le Zhen 3, LU Yun Xiao 3,MENG Wei Bin 3 (1. Dept of Oil Production Engng, Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China; 2. Dept of Exploration Affairs, Shengli Oilfield Company, Sinopec, Dongying, Shandong 257000, China; 3. Downhole Operations and Services Company, Shengli Oilfield Company, Sinopec, Dongying, Shandong 257000, China)
出处 《油田化学》 CAS CSCD 北大核心 2002年第4期 322-324,共3页 Oilfield Chemistry
关键词 盐酸酸化液 乏酸 地下胶凝 深穿透 自转向 低伤害 研制 储层保护 油田化学剂 hydrochloric acidizing fluid spent acid in situ gelation self diverting low damage deep penetration preparation protecting reservoir formations
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参考文献3

  • 1Thomas R L. Syed A Ali, Robert J A, et al. Field validation of a foam diversion model: a matrix stimulation case study[Z]. SPE 39 422,1998. 被引量:1
  • 2Al-Anazi H A, Nasr-El-Din H A, Mohamed S K. Stimulation of tight carbonate reservoirs using application of acid-in-diesel emulsions: field results[Z]. SPE 39 418,1998. 被引量:1
  • 3Rietjens M, Nieuwpoort M. Acid-sludge: how small particles can make a big impact[Z]. SPE 54 727,1999. 被引量:1

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