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塔河油田奥陶系油藏机械采油优化理论研究与应用
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摘要
塔河油田奥陶系油藏为超深层缝洞型碳酸盐岩稠油油藏,地质条件复杂,投产初期产量高,但油井见水早,含水上升快,产量递减快;为了进一步改善机械采油的增产效果,研究了井筒化学降粘剂及相应的配套工艺技术,主要包括化学降粘剂的评价及其现场试验、高压光杆密封器和组合式油气分离器的研制,为塔河油田碳酸盐岩油藏的中后期高效开发创造了技术条件;优化了塔河油田深井举升工艺,研究了塔河油田自喷井、抽油井的油井流入动态和井筒中环空压力的计算方法,为塔河油田采油工艺的优化设计奠定了基础;根据塔河油田机械采油实践,研究和优化了不同开发阶段、不同缝洞单元、不同油品性质的采油工艺技术,主要包括有杆泵和电潜泵两种采油方式下的生产系统优化理论研究,并开发了相应的计算机软件,取得了很好的应用效果。
     该项配套研究,对于塔河油田的经济有效开采具有现实意义,同时为塔河油田其它区块开采提供相应的技术支持和必要的技术准备。
Tahe Ordovician oil reservoir is a super-deep carbonate heavy oil reservoir with fractures and cavities. Due to the complicated reservoir properties, the initial well production rates are much higher, but decreases quickly after bottom water breakthrough at very early production stage. To improve the artificial lift deliverability, well-bore viscosity-reducing agent and corresponding matching techniques were investigated, including the chemical viscosity-reducing agent evaluating, the related surface process allocating, the oilfield testing, the developing of the high pressure-resistance polished-rod stuffing box and the assembled oil gas separator. All of these investigations were contributed to the carbonate heavy oil reservoir production in the later or mature producing period. To lay a basis for the oilfield production design, Tahe oilfield deep-well artificial lift techniques were optimized through the calculation of the natural flowing and unit pumping well inflow performances and the annular pressure distribution along the well-bore. The production techniques for different production periods, different fracture and cavity units and even different oil properties were studied and optimized according to Tahe oilfield artificial lift practice, mainly including rod-pump and electric submersible pump production system optimization theoretical studies. The corresponding software were developed and proved efficient by the oilfield application.
     The artificial lift matching techniques described above not only means great to Tahe oilfield cost efficient development, but also provides necessary technical support and preparation for other blocks development of the oilfield.
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