Key Technologies in the Efficient Development of the Weiyuan Shale Gas Reservoir, Sichuan Basin
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摘要:
威远页岩气藏地质条件复杂，工程技术面临很大挑战，因此，通过地质和工程技术的相互融合，以“选好区、打准层、压好井、采好气”为核心，从地质评价及井位部署优化、水平井优快钻井及精准地质导向、水平井体积压裂、排采及动态分析等4个关键环节入手进行技术攻关，形成了适合威远页岩气藏勘探开发的6项关键技术，即页岩气高产区带评价与优选技术、复杂地表条件下一体化井位部署与优化、长水平段丛式水平井高效钻井完井技术、页岩甜点录井辅助地质导向技术、页岩气体积压裂技术、排采测试及气藏开发动态分析技术。6项关键技术在威远页岩气藏开发中得到推广应用并不断完善，开发效果不断提高，主力产层龙一11小层的钻遇率达到98%，钻井周期缩短至69.2 d，测试产量达到19.7×104 m3/d，单井最终可采储量增至10 482×104 m3。6项关键开发技术为威远页岩气藏的高效开发提供了技术支持，且技术的适应性不断增强。
Abstract:The Weiyuan shale gas reservoir presents complex geological conditions and poses numerous engineering challenges. To address those problems, technical research was conducted through the integration of geological and engineering technologies. The study included four major aspects: geological evaluation and well locations optimization, horizontal well rapid drilling and precise geosteering, horizontal well volume fracturing, drainage production and dynamic analysis, which follows the rules of "selecting the zone, hitting the target layer, killing the well and producing gas properly". Six key technologies suitable for the exploration & development of Weiyuan shale gas reservoirs have been established: 1) shale gas high-yield zone evaluation and selection, 2) integrated well location deployment and optimization under complex surface conditions, 3) efficient drilling/completion of long horizontal section cluster horizontal wells, 4) shale "sweet point" mud logging assisted geosteering, 5) shale gas volume fracturing, 6) drainage testing and gas reservoir development dynamic analysis. Those key technologies have been applied and optimized in the development of Weiyuan shale gas reservoir, and the development effect is under continuous improvement. The main production zone in the Long 1 11 member has a reservoir encountering rate of 98%, the drilling cycle is shortened to 69.2 days, the test output reaches 19.7×104 m3/d, and the final recoverable reserves per well is up to 10 482×104 m3. These six key development technologies provide technical support for in the efficient development of Weiyuan shale gas reservoir, and their technical adaptability is constantly being enhanced.
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图 2 威远某平台布井方式示意
Figure 2. Schematic diagram of the wells arrangement of a Weiyuan well-pad
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图 3 双二维井眼轨道示意
Figure 3. Schematic diagram of double two-dimensional wellbore trajectory
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图 4 威远五峰组—龙马溪组地球化学标准层序
Figure 4. Geochemical standard sequence of Weiyuan Wufeng-Longmaxi Formations
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图 6 威远页岩水力裂缝扩展与形态判别
Figure 6. Hydraulic fracture propagation and pattern discrimination of Weiyuan shale
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图 7 威远页岩气区块主要钻井试采指标
Figure 7. Main drilling and pilot production indicators in Weiyuan shale gas block
表 1 威远区块不同类别井年产量递减率
Table 1 Annual production decline rate of different well types in Weiyuan Block
井类别 产量/（104m3·d–1） 递减率，% 第1年 第2年 Ⅰ类 14.26 5.39 62.2 Ⅱ类 6.59 2.58 60.8 Ⅲ类 3.85 1.71 55.6 
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