尕斯油田薄互层控缝高压裂技术研究
Research on Controlling Slot Height of Fracturing Technology in Thin lnterbedded Layer of Gasi Oilfield
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- 引用格式:
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许超兰,谭,鹏.尕斯油田薄互层控缝高压裂技术研究[J].天然气与石油,2015,33(6):0.doi:
Xu Chaolan, Tan Peng.Research on Controlling Slot Height of Fracturing Technology in Thin lnterbedded Layer of Gasi Oilfield[J].Natural Gas and Oil,2015,33(6):0.doi:
- DOI:
- 作者:
- 许超兰 谭 鹏
Xu Chaolan, Tan Peng
- 作者单位:
- 中国石油大学(北京)石油工程学院
Petroleum Engineering College, China University of Petroleum(Beijing)
- 关键词:
- 薄互层；压裂；裂缝高度；人工隔层；控缝高压裂
Thin interbed reservoirs; Fracturing; Fracture height; Artificial barriers; Control fracture-height fracturing
- 摘要:
- 薄互层油藏具有储层物性差、有效厚度薄、天然裂缝发育、储隔层应力差小等特点，压裂改造是这类储层投产或增产的重要手段。压裂改造的技术难点在于压裂目的层薄，隔层遮挡能力差，压裂施工容易压窜，缝高难以控制，加剧层间矛盾。以青海尕斯油田为例，通过对人工裂缝高的影响因素进行研究，对各种控缝高技术适应性进行分析，选出合适的控缝高技术。对尕斯油田的X井进行人工隔层技术优化设计试验，模拟结果表明，缝高得到有效控制，由常规压裂的18.0 m变为12.9 m，其上下隔层都不会被压窜，保证了压裂施工的成功，同时缝长得到增加。该方法可应用于现场控缝高压裂设计。
Low permeability thin interbed reservoir has such characteristics as poor reservoir property, thin effective thickness, developed natural fractures and lower difference of stress between formations and barriers and hydraulic fracturing technology is an important means of putting into production in commission or increasing production for such reservoirs. However, main technical difficulties of the fracturing technology lie in thin target layer and poor sheltering capacity of interlayers, which will make the hydraulic treatment break the interlayers easily and increase the layer-to-layer heterogeneity. Conducted is analysis on factors likely affecting the height of artificial fractures in Qinghai Casi Oilfield, researched is the adaptability of variable fracture-height control technique, finally selected is an appropriate one and carried out is optimization design test of artificial barrier technology on Well X in this oilfield. The simulation results show that the fracture height is controlled effectively, which changes from 18.0m of conventional fracturing to 12.9m. This method can be used in similar oilfield design.
