TW气田P组低渗气藏压裂技术研究
发布时间：2018-11-24 14:24
【摘要】：TW气田P组气藏为典型的低渗透砂岩气藏。近年来随着低渗油气资源在海上新增油气资源中所占比例逐渐增大,水力压裂等增产改造措施已经成为海上油气开发必须面临的技术问题。TW气田水力压裂面临压裂材料性能要求高、施工环境特殊和可借鉴的经验少等问题,加上海上压裂技术和设备的限制,导致现TW气田压裂工艺技术的应用还未达预期。本文针对TW气田P组气藏压裂存在的难点,采取资料调研、室内实验和现场试验等手段,对压裂工程地质、压裂液、支撑剂和压裂工艺等进行了研究,取得如下成果。①通过地质资料分析及室内实验可知,TW气田P组气藏属于高丰度中孔低渗气藏,目的层存在极强水敏、中等碱敏和中等水锁,同时产凝析油,地层温度可达135℃;②针对TW气田P组储层地质特征,经过主剂和添加剂优选,最终确定配方为0.55%HPG+1%G513-WDJ+0.5%G517-XZ+0.5%YL-11-1%KCl+0.2%YW-1+0.1%Na2CO3 +0.5%CQL-2+0.1%CJSJ-2+1%G514-SCJ+清水的压裂液体系,压裂液体系具有良好的配伍性、抗温抗剪切性,低滤失、低残渣、高防膨,且破胶滤液低张力,对P组储层伤害率为17.7%；③通过技术调研分析并结合TW气田P组储层地质特征,选择烧结陶粒作为该地区储层改造的支撑剂类型,圣戈班陶粒性价比较高,30/50目和20/40目两种规格的圣戈班陶粒均具有良好的物理性能,在高闭合压力下能够保持较好的导流能力,能够满足不同工艺要求对支撑剂的需要;④从储层改造角度,将TW气田P组储层分成三类,对三类储层进行了压裂缝长、导流能力、施工参数的优化,获得了不同储层对应的最优缝长、导流能力和施工参数,为单井优化设计提供了参考依据；⑤对比压裂船压裂和平台压裂两种压裂方式,认为两种压裂方式各有优缺点；通过对国内外常用排液技术分析,在满足海上低渗储层的施工条件下,伴注液氮、气举阀气举、连续油管气举等方法进行压后助排,可以达到较好的返排效果。从现场应用来看,A6井现场压裂施工压力平稳,加砂顺利,按照设计完成了加砂量,达到了设计要求,施工过程中压裂液交联情况良好,耐温性高,携砂性能良好,满足了现场施工的需求,累计排出地层液体175.6m3,返排率82.5%,返排效果较好,压后测试产气量1.5×104m3/d～2×104m3/d之间波动。同时,A6井首次采用完井阶段直接压裂然后投产的思路,是一次有益的探索,为今后类似井的完井增产一体化提供了参考和依据。
[Abstract]:P formation gas reservoir in TW gas field is a typical low permeability sandstone gas reservoir. In recent years, with the increasing proportion of low permeability oil and gas resources in the new offshore oil and gas resources, Hydraulic fracturing and other measures to increase production have become technical problems that must be faced in offshore oil and gas development. Hydraulic fracturing in TW gas field is faced with high requirements for fracturing material performance, special operating environment and less experience to be used for reference. Combined with the limitation of offshore fracturing technology and equipment, the application of fracturing technology in TW gas field is not up to expectations. In this paper, the fracturing engineering geology, fracturing fluid, proppant and fracturing technology of P group gas reservoir in TW gas field are studied by means of data investigation, laboratory experiment and field test. The results are as follows: 1 through the analysis of geological data and laboratory experiments, it can be seen that P gas reservoirs in TW gas field belong to high abundance, medium porosity and low permeability gas reservoirs, and there are very strong water sensitivity, medium alkali sensitivity and moderate water locks in the target layer, and condensate oil is produced at the same time. Formation temperature can reach 135 鈩，
本文编号：2354060
[Abstract]:P formation gas reservoir in TW gas field is a typical low permeability sandstone gas reservoir. In recent years, with the increasing proportion of low permeability oil and gas resources in the new offshore oil and gas resources, Hydraulic fracturing and other measures to increase production have become technical problems that must be faced in offshore oil and gas development. Hydraulic fracturing in TW gas field is faced with high requirements for fracturing material performance, special operating environment and less experience to be used for reference. Combined with the limitation of offshore fracturing technology and equipment, the application of fracturing technology in TW gas field is not up to expectations. In this paper, the fracturing engineering geology, fracturing fluid, proppant and fracturing technology of P group gas reservoir in TW gas field are studied by means of data investigation, laboratory experiment and field test. The results are as follows: 1 through the analysis of geological data and laboratory experiments, it can be seen that P gas reservoirs in TW gas field belong to high abundance, medium porosity and low permeability gas reservoirs, and there are very strong water sensitivity, medium alkali sensitivity and moderate water locks in the target layer, and condensate oil is produced at the same time. Formation temperature can reach 135 鈩，
本文编号：2354060
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