致密碳酸盐岩水平井各段产出贡献及其主控因素--以鄂尔多斯盆地大牛地气田为例  

Production dedication of each interval in horizontal wells of tight carbonate reservoirs and its main controls:An example from Daniudi gasfield,Ordos Basin

作　　者：吴悦 WU Yue(No.1 Gas Production Plant,Sinopec North China Petroleum Company,Yulin,Shanxi 719000,China)

机构地区：[1]中国石化华北油气分公司采气一厂,陕西榆林719000

出　　处：《天然气技术与经济》2025年第1期13-19,共7页Natural Gas Technology and Economy

摘　　要：下古生界碳酸盐岩气藏是鄂尔多斯盆地大牛地气田目前主要产能接替层系,但碳酸盐岩水平井各段产出贡献不清、主控因素不明确,制约了水平井单井天然气产能提升和降本增效。为此,基于连续油管产剖测试技术,获得了碳酸盐岩水平井各段差异性的认识,明确了各段产出贡献的主控因素。研究结果表明:①当气井水平段储层物性较好时,储层物性和含气性是影响气井各段产气能力的主控因素,储层改造规模对各段产出的影响较小;②当气井水平段储层物性差且差异性小时,储层物性、含气性以及压裂改造规模对各段产出的影响较小,但通过针对不同类型储层制订不同的压裂思路及规模,可以实现较差储层的增产。结论认为:①针对碳酸盐岩气藏水平井建议优先部署裂缝-孔洞型储层有利发育区,其次适当增加压裂改造规模,以提高致密碳酸盐岩气藏的开发效果;②针对孔隙型储层发育区,建议针对各段储集层类型,差异化制订改造思路,实现各段的有效产出。At present,the Lower Paleozoic carbonate gas reservoirs are regarded as the main productivity substitute in Da-niudi gasfield.But how each interval dedicates to the production in carbonate horizontal wells is unclear,and the main con-trols on this dedication are ambiguous as well,all conditioning the production increase,cost reduction and efficiency im-provement.To this end,some difference among these intervals was found out through liquid-producing profile tested by coiled tubing.In addition,the main controls was made clear.Results show that(i)the stimulation size exerts little impact on each interval production when one horizontal interval is located in certain reservoirs with better physical properties,and these properties and gas content as fundamental factors can affect the productivity in each interval;and(ii)when one inter-val is located in other reservoirs whose physical properties are poor with small difference,the physical properties,gas con-tent and fracturing scale still have little impact on each interval production.Nevertheless,stimulation may be gained in such poor reservoirs through special fracturing.In conclusion,it is recommended for carbonate gas reservoirs in horizontal wells to prioritize the deployment in favorable blocks developed with fractured-porous reservoirs,followed by appropriately increasing the stimulation scale for efficiency improvement in tight carbonate gas reservoirs.What's more,for a certain block developed with porous reservoirs,it is supposed to make differentiated stimulation measures for various reservoir types to achieve effective production in each interval.

关 键 词：大牛地气田 碳酸盐岩储层 水平井 产气剖面 鄂尔多斯盆地 

分 类 号：TE243[石油与天然气工程—油气井工程]