龙凤山地区火山岩气藏水锁影响因素分析及保护措施  

Analysis of influencing factors and protective measures of water block in volcanic gas reservoirs in Longfengshan area

作　　者：牟汉生[1] MOU Hansheng(Northeast Oil&Gas Branch,SINOPEC,Changchun 130062,China)

机构地区：[1]中国石油化工股份有限公司东北油气分公司,吉林长春130062

出　　处：《能源化工》2022年第1期63-66,共4页Energy Chemical Industry

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05046)。

摘　　要：针对龙凤山地区火山岩气藏在勘探开发过程中容易产生严重的水锁损害问题,分析了目标区块的地质概况,通过水锁损害试验评价了不同因素对岩心水锁损害率的影响,优选了合适的高效防水锁剂。结果表明:岩心的初始含水饱和度越低、渗透率越低、黏土矿物含量越高,水锁损害率越高;试验流体类型对水锁损害程度的影响较大,胍胶压裂液滤液的水锁损害率最高,而清洁压裂液和滑溜水压裂液的水锁损害率较低,其中滑溜水压裂液的水锁损害率最低。高效防水锁剂LFSY-2可以大幅降低水溶液的表面张力,并能有效降低岩心的水锁损害率,当其质量分数为5%时,能使水溶液的表面张力值降低至21 mN/m以下,使岩心的水锁损害率降低至20%左右,防水锁效果较好。In view of the serious water block damage of volcanic gas reservoirs in Longfengshan area in the process of exploration and development,the geological situation of the target block is analyzed.Through the water block damage experiment,the influence of different factors on the core water block damage rate is evaluated,and the appropriate high-efficiency anti-water blocking agent is optimized.The results show that the lower the initial water saturation,the lower the permeability and the higher the clay mineral content,the higher the water block damage rate.The fluid type has a great influence on the water block damage.The water block damage rate of guanidine gum fracturing fluid filtrate is the highest,while the water block damage rate of clean fracturing fluid and slick water fracturing fluid is lower,among which the water block damage rate of slick water fracturing fluid is the lowest.The high-efficiency anti-water blocking agent LFSY-2 can greatly reduce the surface tension of aqueous solution and effectively reduce the water block damage rate of core.When the mass fraction of LFSY-2 is 5%,which can reduce the surface tension of aqueous solution to less than 21 mN/m and reduce the water block damage rate of core to about 20%,the water block preventing effect is good.

关 键 词：龙凤山地区 火山岩气藏 水锁损害 影响因素 

分 类 号：TE258[石油与天然气工程—油气井工程]