羧甲基羟丙基胍胶酸性压裂液体系的制备及性能
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摘要
为了改善羧甲基羟丙基胍胶(CMHPG)酸性压裂液性能,满足高温深井储层压裂改造需求,合成了一种有机交联剂,形成了组成为0.3%数0.6%CMHPG+0.6%数1.0%有机交联剂ZJ-1+0.6%交联调节剂TG-1+0.2%黏土稳定剂NW-1+0.3%高效增效剂G-ZP+0.05%APS的酸性压裂液体系,考察了该压裂液体系的耐温耐剪切性能、黏弹性、滤失性能、破胶性能和岩心基质损害率。研究结果表明,CMHPG加量为0.6%、交联剂ZJ-1加量为0.75%的压裂液体系在130℃、170 s~(-1)连续剪切90 min,冻胶的黏度大于200 mPa·s,150℃、170 s~(-1)连续剪切90 min,冻胶黏度大于100 mPa·s,表现出良好的耐温耐剪切性;CMHPG加量为0.3%的酸性压裂液冻胶的G'/G"值大于4,结构黏度强,携砂性能好;在90℃、破胶剂加量0.05%的情况下可实现1.5 h内破胶,破胶液黏度小于3 mPa·s,破胶液残渣含量为157 mg/L,对钠膨润土的防膨率为93%,表面张力23.9 mN/m,与煤油间的界面张力为0.85 mN/m;压裂液滤失量低,滤液对储层岩心基质渗透率伤害率约16%,对储层的伤害较小。该CMHPG酸性压裂液体系在某盆地页岩油探井进行了现场应用,取得了良好的应用效果。图3表7参10
In order to improve the performance of carboxymethyl hydroxypropyl guar(CMHPG)acid fracturing fluid and meet the needs of high temperature deep well reservoir fracturing,an organic cross-linking agent was synthesized,a CMHPG acid fracturing fluid,composed of 0.3%—0.6% CMHPG,0.6%—1.0% organic cross-linking agent ZJ-1,0.6% conditioning agent TG-1,0.2% clay stabilizer NW-1 and 0.3% high-efficiency clay stabilizer G-ZP,was prepared and the temperature and shear resistance,viscoelasticity,filtration property,gel-breaking performance and the matrix damage of the fracturing fluid upon core were investigated. The results showed that the continuous shear viscosity of the system containing 0.6% CMHPG and 0.75% organic cross-linking agent ZJ-1 was more than 200 mPa·s when sheared at the temperature of 130℃ and at the shearing rate of 170 s-1 for90 min,and more than 100 mPa·s when sheared at the temperature of 150℃ and at the shearing rate of170 s-1 for 90 min,indicating great temperature and shear resistance. Viscoelastic test results showed that the G'/G" of the acid fracturing fluid with the CMHPG content of 0.3% was greater than 4,exhibiting the strong structure viscosity and great sand-carrying performance. When 0.05% gel breaker was added,the system could be broken within 1.5 hours at the temperature of 90℃ with the viscosity of breaking solution less than 3 mPa·s,gel breaking residue of 157 mg/L,anti-swelling rate of 93%,surface tension of 23.9 mN/m and interface tension of 0.85 mN/m. The damage rate of matrix permeability of the reservoir core was 16%,and the damage to the reservoir and filtration loss was relatively low. The CMHPG acid fracturing fluid system was applied in a shale oil exploration well and achieved good application results.
In order to improve the performance of carboxymethyl hydroxypropyl guar(CMHPG)acid fracturing fluid and meet the needs of high temperature deep well reservoir fracturing,an organic cross-linking agent was synthesized,a CMHPG acid fracturing fluid,composed of 0.3%—0.6% CMHPG,0.6%—1.0% organic cross-linking agent ZJ-1,0.6% conditioning agent TG-1,0.2% clay stabilizer NW-1 and 0.3% high-efficiency clay stabilizer G-ZP,was prepared and the temperature and shear resistance,viscoelasticity,filtration property,gel-breaking performance and the matrix damage of the fracturing fluid upon core were investigated. The results showed that the continuous shear viscosity of the system containing 0.6% CMHPG and 0.75% organic cross-linking agent ZJ-1 was more than 200 mPa·s when sheared at the temperature of 130℃ and at the shearing rate of 170 s-1 for90 min,and more than 100 mPa·s when sheared at the temperature of 150℃ and at the shearing rate of170 s-1 for 90 min,indicating great temperature and shear resistance. Viscoelastic test results showed that the G'/G" of the acid fracturing fluid with the CMHPG content of 0.3% was greater than 4,exhibiting the strong structure viscosity and great sand-carrying performance. When 0.05% gel breaker was added,the system could be broken within 1.5 hours at the temperature of 90℃ with the viscosity of breaking solution less than 3 mPa·s,gel breaking residue of 157 mg/L,anti-swelling rate of 93%,surface tension of 23.9 mN/m and interface tension of 0.85 mN/m. The damage rate of matrix permeability of the reservoir core was 16%,and the damage to the reservoir and filtration loss was relatively low. The CMHPG acid fracturing fluid system was applied in a shale oil exploration well and achieved good application results.
引文
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[8]翟文,程兴生,卢拥军,等.水基压裂液黏弹性特征研究[C].//2013年全国天然气学术年会,昆明,2013:237-243.
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[10]何建平,邓明宇,彭树华,等.GW-CF低残渣压裂液体系[J].石油技术论坛,2013(4):53-56.
[2]张华丽,周继东,周瑜,等.羧甲基羟丙基胍胶压裂液的研究与应用[J].复杂油气藏,2013,6(2):77-80.
[3]刘祥,沈燕宾.一种酸性压裂液研制及其性能评价[J].应用化工,2011,40(12):2186-2188.
[4]蒋建方,陆红军,慕立俊,等.羧甲基羟丙基胍胶压裂液的高温性能评价[J].油田化学,2011,18(3):309-212.
[5]刘祥,李从妮.有机锆对羧甲基羟丙基胍胶的交联性能研究[J].化学工程师,2011,185(5):10-13.
[6]赵晓飞,李岩,余庆龙,等.一种新型水基压裂液酸性交联剂的制备[J].化工科技,2012,20(1):19-22.
[7]杨亚宇,徐晓刚,杨晓春,等.不同pH值下交联胍胶压裂液性能研究[J].石油与天然气化工,2010,39(5):428-430.
[8]翟文,程兴生,卢拥军,等.水基压裂液黏弹性特征研究[C].//2013年全国天然气学术年会,昆明,2013:237-243.
[9]苏创,唐美芳,方波,等.可再生低分子量羧甲基羟丙基胍胶体系流变性研究[J].石油与天然气化工,2011,40(1):58-62.
[10]何建平,邓明宇,彭树华,等.GW-CF低残渣压裂液体系[J].石油技术论坛,2013(4):53-56.