大牛地致密气藏超低浓度瓜胶压裂液体系的开发与评价  

DEVELOPMENT AND EVALUATION OF ULTRA-LOW CONCENTRATION GUAR GUM FRACTURING FLUID SYSTEM IN DANIUDI TIGHT GAS RESERVOIR

作　　者：李雷 邱小庆 方彦明 刘学伟 赵静[2] LI Lei

机构地区：[1]中石化华北油气分公司石油工程技术研究院 [2]中国石油大港油田公司石油工程研究院 [3]大连知微生物科技有限公司

出　　处：《钻采工艺》2019年第4期104-107,12,共4页Drilling & Production Technology

基　　金：国家科技重大专项“低丰度致密低渗油气藏开发关键技术”(编号2016ZX05048);中石化科技部项目“致密砂岩油藏有效开发关键技术应用研究”(编号P14076-1);辽宁省“百千万人才工程”重点项目“高效降解氯酚类污染物的海洋漆酶”(编号2015-4);大连市科技计划项目“新型环境酶制剂开发与产业化”(编号2015F11GH089)

摘　　要：大牛地气田为低孔致密气藏,压裂改造是提高单井产量的有效措施。为了满足大牛地气田绿色建设的需求,需要降低储层伤害、经济高效的压裂液体系。文章开发并评价适合于低孔致密气藏的超低浓度瓜胶压裂液体系,其优势是应用自主研制的超强延迟交联剂,降低羟丙基瓜胶用量到0.25%~0.30%,较常规0.45%羟丙基瓜胶用量降低了30%~44%。该超低浓度瓜胶压裂液体系的交联时间35~45 s;90℃,170 s^-1连续剪切120 min,黏度100 mPa·s以上,耐温耐剪切性能良好;38%砂比条件下的静态悬砂能力强;采用APS和FANTA生物酶破胶剂复合技术,破胶时间从120~240 min可控,破胶液黏度<3 mPa·s,破胶残渣量<200 mg/L,易返排,储层伤害小。超低浓度瓜胶压裂液体系降低生产成本,满足大牛地低孔致密气藏现场施工的需要,应用价值和推广潜力巨大,具有较好的发展前景。Fracturing is an effective method to improve the single well production in Daniudi gas field due to its low-porosity and tight properties. In order to meet the demand of green gas field construction in Daniudi,it is necessary to reduce the reservoir damage and cost-effective fracturing fluid system. In this paper,an ultra-low concentration guar gum fracturing fluid system suitable for low-porosity and tight gas reservoirs was developed,which was characterized by the introduction of independently developed super-delayed crosslinking agent,which reduced the amount of hydroxypropyl guar gum to 0. 25 % ～ 0. 30%,compared with the conventional 0. 45% hydroxypropyl guar gum dosage decreased by 30% ～ 44%. The cross-linking time of the ultra-low concentration guar gum fracturing fluid system was 35～ 45 s,meanwhile the viscosity of crosslinked jelly was more than 100 mP a·s under 90℃,170 s-1 after shearing 120 min and it still had fine prop-carrying ability under 38% high sand concentration. Applying APS and FANTA enzyme coupledbreaker technology,the gel-breaking time was 120 to 240 min,and the viscosity of gel breaking liquid and residue value was less than 3 mP a·s and 200 mg/L,respectively. The characters of the fructuring fliud made flowback easily and decreased the formation damage. Ultra-low concentration guar gum fracturing fluid system could both reduce costs and meet the technial requirments for the field operation,which has great prospects for development.

关 键 词：致密气藏 超低浓度瓜胶压裂液体系 延迟交联 流变性能 悬砂性能 破胶性能 

分 类 号：TE3[石油与天然气工程—油气田开发工程]