煤层气井压裂液体系优化——以彬长矿区大佛寺井田为例
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摘要
以彬长矿区大佛寺井田4#煤储层为研究对象,通过对煤储层物性、水敏性、地表水水质及配伍性、防膨剂的防膨性与伤害性等进行系统分析,掌握煤储层的水敏、储层伤害原因及规律,筛选出合理的活性水压裂液体系,为彬长矿区及类似地区的地面煤层气开发提供一定的借鉴和参考作用。研究结果表明,大佛寺4#煤中易水化膨胀的黏土矿物含量较少,煤心渗透率与压裂用水矿化度呈正相关关系,表现出较强水敏特征。进一步优化压裂液配方发现:大佛寺井田地表水与煤储层水具有良好的配伍性,适合作为压裂用水;1. 5%KCl溶液对储层伤害较低且经济性较好,可作为压裂液防膨剂。结合前人研究结果,最终确定大佛寺井田煤层气井压裂液配方为:大佛寺地表水+1. 5%KCl防膨剂+0. 3%DB-80助排剂。
This paper,based on a case study on No. 4 coal seam of Dafosi well field,Binchang district,analyzes its reservoir physical properties,water sensibility,surface water quality and compatibility,anti-swelling agent's features and harmfulness,and selects appropriate active hydraulic fracturing liquid system,aiming at providing references for Binchang district or similar regions to develop ground CBM. Results show that the No. 4 coal seam bears less quantity of expansive clay minerals,and coal permeability is positive to fracturing water mineralization,with a strong water sensibility. Optimization of fracturing liquid formula indicates a good compatibility of ground water and coal reservoir water,good to be used as fracturing water. 1. 5% KCl solution,less harmful to reservoir and less costly,may be used as anti-swelling agent. This final fracturing liquid formula is written as ground water + 1. 5% KCl anti-swelling agent +0. 3% DB-80 cleanup additive.
This paper,based on a case study on No. 4 coal seam of Dafosi well field,Binchang district,analyzes its reservoir physical properties,water sensibility,surface water quality and compatibility,anti-swelling agent's features and harmfulness,and selects appropriate active hydraulic fracturing liquid system,aiming at providing references for Binchang district or similar regions to develop ground CBM. Results show that the No. 4 coal seam bears less quantity of expansive clay minerals,and coal permeability is positive to fracturing water mineralization,with a strong water sensibility. Optimization of fracturing liquid formula indicates a good compatibility of ground water and coal reservoir water,good to be used as fracturing water. 1. 5% KCl solution,less harmful to reservoir and less costly,may be used as anti-swelling agent. This final fracturing liquid formula is written as ground water + 1. 5% KCl anti-swelling agent +0. 3% DB-80 cleanup additive.
引文
[1]李景明,巢海燕,李小军,等.中国煤层气资源特点及开发对策[J].天然气工业,2009,29(4):9-13
[2]秦勇,袁亮,胡千庭,等.我国煤层气勘探与开发技术现状及发展方向[J].煤炭科学技术,2012,40(10):1-6
[3]张高群,肖兵,胡娅娅,等.新型活性水压裂液在煤层气井的应用[J].钻井液与完井液,2013,30(1):66-68
[4]许耀波.基于芦岭井田煤储层特征的压裂液优选[J].煤矿安全,2015,46(7):67-69
[5]白建平,武杰.压裂液对煤储层伤害实验及应用:以沁水盆地西山区块为例[J].煤田地质与勘探,2016,44(4):77-80
[6]张旭峰.陕西彬长矿区低阶煤地面煤层气开发方式[J].资源与产业,2018,20(1):34-38
[7]严康,白怀东,刘厚宁,等.大佛寺井田煤储层孔隙特征[J].西部探矿工程,2014,26(5):147-150
[8]范耀.彬长矿区大佛寺井田煤层气直井排采制度优化[J].煤炭技术,2015,34(11):176-178
[9]管保山,刘玉婷,刘萍,等.煤层气压裂液研究现状与发展[J].煤炭科学技术,2016,44(5):11-17
[10]陈进,刘蜀知,钟双飞,等.压裂液吸附对煤层损害的实验研究及影响因素分析[J].西部探矿工程,2008(11):62-64
[11]中联煤层气有限责任公司.煤层气勘探开发技术研究[M].北京:石油工业出版社,2007
[12]陈江,吕建伟,郭东鑫,等.煤层气产能影响因素及开发技术研究[J].资源与产业,2011,13(1):108-113
[13]王丽伟,蒙传幼,崔明月,等.压裂液残渣及支撑剂嵌入对裂缝伤害的影响[J].钻井液与完井液,2007,24(5):59-61
[2]秦勇,袁亮,胡千庭,等.我国煤层气勘探与开发技术现状及发展方向[J].煤炭科学技术,2012,40(10):1-6
[3]张高群,肖兵,胡娅娅,等.新型活性水压裂液在煤层气井的应用[J].钻井液与完井液,2013,30(1):66-68
[4]许耀波.基于芦岭井田煤储层特征的压裂液优选[J].煤矿安全,2015,46(7):67-69
[5]白建平,武杰.压裂液对煤储层伤害实验及应用:以沁水盆地西山区块为例[J].煤田地质与勘探,2016,44(4):77-80
[6]张旭峰.陕西彬长矿区低阶煤地面煤层气开发方式[J].资源与产业,2018,20(1):34-38
[7]严康,白怀东,刘厚宁,等.大佛寺井田煤储层孔隙特征[J].西部探矿工程,2014,26(5):147-150
[8]范耀.彬长矿区大佛寺井田煤层气直井排采制度优化[J].煤炭技术,2015,34(11):176-178
[9]管保山,刘玉婷,刘萍,等.煤层气压裂液研究现状与发展[J].煤炭科学技术,2016,44(5):11-17
[10]陈进,刘蜀知,钟双飞,等.压裂液吸附对煤层损害的实验研究及影响因素分析[J].西部探矿工程,2008(11):62-64
[11]中联煤层气有限责任公司.煤层气勘探开发技术研究[M].北京:石油工业出版社,2007
[12]陈江,吕建伟,郭东鑫,等.煤层气产能影响因素及开发技术研究[J].资源与产业,2011,13(1):108-113
[13]王丽伟,蒙传幼,崔明月,等.压裂液残渣及支撑剂嵌入对裂缝伤害的影响[J].钻井液与完井液,2007,24(5):59-61