Integrated Techniques in Tight Reservoir Development for Horizontal Wells in Block Shun 9
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摘要: 顺9井区志留系碎屑岩储层存在埋藏深、温度高、物性差和底水发育,前期直井压裂后无法获得稳定产能的问题,为此,开展了水平井一体化开发技术研究。按照钻井、完井和压裂一体化设计的思想,水平井方位角设计为137.7°,与最大主应力方向正交,以提高压裂后泄油面积;使用油基钻井液钻进,保证井径规则,便于分段完井工具坐封;优选耐温130℃、耐压差70 MPa的裸眼封隔器,保证分段成功,并将压裂端口置于储层发育段,便于裂缝起裂;通过降低胍胶浓度和优化添加剂用量,形成耐温130℃的低伤害压裂液;采用油藏数值模拟方法优化压裂施工参数,应用常规压裂+人工隔层控缝高技术实现避水高度30 m,控缝高、深穿透压裂,形成顺9井区致密油藏水平井一体化开发关键技术。现场试验表明,水平井压裂后产能较直井提高4倍,2口井累计产油量达1.02×104 m3。水平井一体化开发技术提高了顺9井区致密油藏开发效果,对国内同类致密油藏开发具有一定借鉴意义。Abstract: Block Shun 9, a Silurian clastic reservoir, is characterized by deep burial depth and high temperature, poor physical property and bottom water development. Due to the lack of stable productivity for vertical wells after hydraulic fracturing in the primary stage in Block Shun 9, the integrated development performance for horizontal wells was studied. Based on integrated drilling, completion and hydraulic fracturing, a horizontal well was drilled in NE137.7°, perpendicular to the maximum horizontal stress, to increase oil drainage area for a later production stage. Oil based drilling fluid was used to prevent borehole instability issues and to more easily set the completion packer. In this case, the optimal packer in open hole could be used under 130℃ and 70 MPa, and the target stimulation section was selected in the fracture developed zone th facilitate fracture initiation. Fracturing fluid was developed that would have a lower damage rate to reservoir and would be able to resist 130℃ reservoir temperature by reducing the concentration of guar gum and optimizing the additive. a numerical reservoir simulation was conducted to optimize the parameters of fracturing treatment. Conventional methods and a designed barrier for fracture height control were used to control fracture height and keep them within 30 m to avoid connection with the water zone. The techniques of integrated tight reservoir development with horizontal well in Block Shun 9 were developed. The application in two wells showed that the productivity of horizontal wells after hydraulic fracturing was 4 times higher than that from vertical wells, and oil production reached to 1.02×104 m3. This study demonstrated that integrated development with horizontal wells is an effective method in tight reservoir development in Block Shun 9, and can be taken as a reference to the development of tight reservoirs.
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Keywords:
- tight reservoir /
- horizontal well /
- integrated development /
- Block Shun 9
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