煤层气开采过程中储层损害原因分析及保护措施
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摘要
在大多数煤储层中,都含有机械强度相对较低、应力敏感性相对较强,并伴随着微裂缝分布极为广泛等诸多特性。故此,当进行钻井时,很容易由于钻井液或者过多的钻井压力,而造成自身的损害,从而严重影响到最终的煤层气开发效果。本文主要基于钻井方面的相关技术,力求对煤储存层进行有效的保护,并且针对钻井有可能对煤层气储层造成一定损害的主要原因,进行了更深层次的细致分析。认为钻井液的性质,钻井过程中对井眼底部压力均对储层造成伤害。通过改变钻井方式,钻井技术以及固相控制技术等方式均会减轻钻井过程中对储层的伤害。通过泡沫钻井液进行储层保护方案成功应用于寺河矿区块的煤层气开采,从而切实提升了该区域的煤层气实际开发效率。
In most coal reservoirs, there are many characteristics, such as relatively low mechanical strength, relatively strong stress sensitivity, and extensive distribution of micro-fractures. Therefore, when drilling, it is easy to cause its own damage due to drilling fluid or excessive drilling pressure, which seriously affects the ultimate CBM development effect. This article, mainly based on drilling related technology, strives to effectively protect coal reservoirs, and for drilling may cause some damage to the main reasons of CBM reservoirs, a more in-depth detailed analysis. It is considered that the nature of drilling fluid and the bottom hole pressure during drilling all cause damage to reservoir. By changing the drilling mode, drilling technology and solid phase control technology, reservoir damage will be alleviated in the drilling process. The reservoir protection scheme by foam drilling fluid has been successfully applied to the CBM production in Sihe mining area, thus effectively enhancing the actual development efficiency of CBM in this area.
In most coal reservoirs, there are many characteristics, such as relatively low mechanical strength, relatively strong stress sensitivity, and extensive distribution of micro-fractures. Therefore, when drilling, it is easy to cause its own damage due to drilling fluid or excessive drilling pressure, which seriously affects the ultimate CBM development effect. This article, mainly based on drilling related technology, strives to effectively protect coal reservoirs, and for drilling may cause some damage to the main reasons of CBM reservoirs, a more in-depth detailed analysis. It is considered that the nature of drilling fluid and the bottom hole pressure during drilling all cause damage to reservoir. By changing the drilling mode, drilling technology and solid phase control technology, reservoir damage will be alleviated in the drilling process. The reservoir protection scheme by foam drilling fluid has been successfully applied to the CBM production in Sihe mining area, thus effectively enhancing the actual development efficiency of CBM in this area.
引文
[1]冯琪惠.基于多尺度传质过程的煤岩储层损害实验评价[D].成都:西南石油大学,2016.
[2]刘行.深煤层煤层气井低伤害完井液研究[D].成都:西南石油大学,2015.
[3]战丽颖.煤岩气藏压裂液损害评价及加入纳米粒子改性[D].成都:西南石油大学,2015.
[4]胡友林.沁端区块3~#煤层气储层损害机理及钻井液与完井液技术研究[D].中国地质大学,2015.
[5]易偲文.煤岩储层气体扩散速率影响因素及强化方法[D].成都:西南石油大学,2014.
[6]孙义敏.高岭石/水分散体系对煤储层渗透性影响的实验研究[D].中国矿业大学,2014.
[7]欧阳云丽.钻井过程中井筒压力及压力波动对煤储层的伤害[D].武汉:长江大学,2013.
[8]吴群.延川南煤储层地应力条件及其对煤层气产能的影响[D].西安:西北大学,2012.
[9]任美洲.大佛寺井田煤层气水平对接井钻井技术研究[D].西安:西安科技大学,2012.
[10]陈龙龙.焦坪矿区煤层气采收率影响因素及对策研究[D].西安:西安石油大学,2012.
[11]湛祥惠.煤层气储层水平井钻井过程中储层伤害机理研究[D].武汉:长江大学,2012.
[2]刘行.深煤层煤层气井低伤害完井液研究[D].成都:西南石油大学,2015.
[3]战丽颖.煤岩气藏压裂液损害评价及加入纳米粒子改性[D].成都:西南石油大学,2015.
[4]胡友林.沁端区块3~#煤层气储层损害机理及钻井液与完井液技术研究[D].中国地质大学,2015.
[5]易偲文.煤岩储层气体扩散速率影响因素及强化方法[D].成都:西南石油大学,2014.
[6]孙义敏.高岭石/水分散体系对煤储层渗透性影响的实验研究[D].中国矿业大学,2014.
[7]欧阳云丽.钻井过程中井筒压力及压力波动对煤储层的伤害[D].武汉:长江大学,2013.
[8]吴群.延川南煤储层地应力条件及其对煤层气产能的影响[D].西安:西北大学,2012.
[9]任美洲.大佛寺井田煤层气水平对接井钻井技术研究[D].西安:西安科技大学,2012.
[10]陈龙龙.焦坪矿区煤层气采收率影响因素及对策研究[D].西安:西安石油大学,2012.
[11]湛祥惠.煤层气储层水平井钻井过程中储层伤害机理研究[D].武汉:长江大学,2012.
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