基于储层甜点特征的致密砂砾岩油气藏压裂增产技术研究  

Study on Fracturing Stimulation Techniques for Tight Sandy Conglomerate Oiland Gas Reservoir Based on Reservoir Sweets Spot Characteristics

作　　者：彭海军[1] 潘丽燕 刘荷冲[1] 王红卫 吴涛[1] 费李莹 江祖强[1] 李勇广[1] PENG Haijun;PAN Liyan;LIU Hechong;WANG Hongwei;WU Tao;FEI Liying;JIANG Zuqiang;LI Yongguang(Research Institute of Exploration and Development of PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;Engineering Technology Research Institute of PetroChina,Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China;Emergency Rescue Center of PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依市834000 [2]中国石油新疆油田分公司工程技术研究院 [3]中国石油新疆油田分公司应急抢险救援中心

出　　处：《钻采工艺》2024年第1期94-101,共8页Drilling & Production Technology

基　　金：中国石油天然气股份有限公司“十四五”前瞻性基础性重大科技项目“地层不整合油气藏成藏主控因素与关键要素定量评价技术研究”(编号:2021DJ0405)。

摘　　要：中拐凸起南斜坡二叠系佳木河组二段储层为一套含浊沸石的致密砂砾岩。早期,在有利构造上钻探的直井产量均较低,2014年钻探该区第一口水平井用于提产,但因未能有效控制缝高,致深部水体锥进过快,长期试采效果差。近年来,地震地质综合研究发现,储层存在局部甜点。因下部并无隔层,压裂时需严格控制裂缝下延。通过对储层甜点特征进行梳理,综合评价了各断块甜点的优质程度,为试油段优选和新井的部署提供依据。为了实现控缝高压裂,提高单井产量和试采效果,开展人工隔层导流能力室内实验、完成人工隔层支撑剂粒径的优选,进行压裂数值模拟研究、确定了研究区形成有效厚度人工隔板的临界施工参数。研究认为,前置液阶段,改变液体黏度和排量、铺置有效人工隔层能够抑制水力裂缝向下扩展;携砂液阶段,加入一定浓度纤维,可进一步提升支撑剂对上部优质储层的支撑。这种组合控缝高工艺技术投入该区压裂实施后,有效控制了裂缝下延高度,甜点层段得到充分改造,试油及后续试采期间维持了较高油气产能,压裂提产效果明显。The reservoir of the second member of the Permian Jiamuhe Formation in the south slope of Zhongguai bulge in the the Junggar Basin is tight sandy conglomerate containing laumontite.The output of vertical wells drilled on favorable structures in the early stages was low.The first horizontal well drilled in the area was used to increase production in 2014,however,the fracture height was not effectively controlled,the deep water coning was too fast,and the long-term test production effect was poor.In recent years,comprehensive research on seismic and geology has found that there are local sweet spots in the reservoir.Because there is no barrier at the bottom,strict control of fracture propagation downward is required during fracturing.By combing the characteristics of the reservoir sweet spots,the quality of the sweet spots of each fault is evaluated comprehensively,which provides a basis for the selection of oil test section and the deployment of new wells.In order to fracture with controlled height and improve the production of single well and test production effect,indoor experiments were conducted on the conductivity of artificial barriers and optimization of the particle size of artificial barrier proppant was completed,numerical simulation research on fracturing was conducted and critical construction parameters for the formation of effective thickness artificial barriers in Zhongjia area were determined.It is concluded that the downward propagation of hydraulic fractures can be inhibited by changing fluid viscosity and displacement and laying effective artificial barriers in the preflush stage.In the proppant carrying stage,adding a certain concentration of fibers can further enhance the support of the proppant for the upper high-quality reservoir.After the application of this combined fracture height control technology in the area,the downward propagation height of the fracture was effectively controlled,and the sweets sections were fully transformed.During well testing and subsequent trial production period

关 键 词：准噶尔盆地 致密砂砾岩 浊沸石 储层甜点 压裂裂缝 增产技术 

分 类 号：TE357[石油与天然气工程—油气田开发工程]