Newly-Developed Visualized Reservoir Characterization While Drilling Technology Improves Understanding of Complex Channel Sand, Assists EOR in a Mature Oilfield in Bo Hai Bay

Bin Yang, M. Nie, Hong Shen, Yu Guo Li, Nian Da Xu, Huan Zhang, Cheng De Niu
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Abstract

PLxx oilfield is a mature oilfield which has been developed by horizontal wells for several years with water-injection production style. It features with shallow, complex, high challenging unconsolidated channel sand with lateral property variation due to pinch out, stacking or lamination. The thickness of pay zone changes from couple of to ten more meters which brings much high challenge to reservoir delineation while drilling and horizontal well placement execution. The oilfield locates at a faulted belt of Bo Hai Bay among which some small faults may happen. But it's difficult to be identified because of the low S/N ratio incurs from the shallow gas effect on the seismic data. Moreover, uneven flowing zone units exist within sandstone package due to dynamic reservoir production, uncertainty of lateral sand connections and possible inter-well interventions. As such, this makes the oil-water distribution more complicated and the oil-water contact isn't uniform in the sand package. In order to furtherly understand the complex channel sand, place the wellbore in the favorable sweet spot and enhance the oil recovery, a newly-developed visualized reservoir characterization while drilling integrated technology associated with RSS(rotary steerable system), HSVP(high speed data transmission system), RTC(remote transmission connection through Internet) and OSC(operation support center) was employed to optimize the operation efficiency during a three-wells drilling campaign in this oilfield. This newly-developed reservoir characterization technique is the industry innovative fully 9 components measuring azimuthal Electro-Magnetic propagation tool in one single sub. It provides not only the conventional propagation resistivity but also the geo-signal responses in a very quick, flexible way. In one of the case, the unique "Dual-diagonal orthogonal T-R antenna design" ensures the DOI (depth of investigation) as deep as 6.8meters. The reservoir boundaries such as the top, the bottom or the oil-water contact were distinctly characterized and the horizontal drainage section was precisely navigated within the profitable pay zone. The post-well reservoir characterization result is comparable with the seismic profile and very helpful to understand the dynamic reservoir flowing zone unit. The excellent performance is also reflected in the oil production; the initial oil production was increased from 40 m3/day to 69m3/day which is 75% higher than expected. Minimum 25% of oil recovery will be enhanced as forecast.
随钻可视化储层表征新技术提高了对渤海湾成熟油田复杂通道砂体的认识,有助于提高采收率
PLxx油田是一个经过多年水平井开发的成熟油田,采用注水开采方式。它的特点是浅、复杂、高挑战性的松散河道砂,由于夹出、堆积或层压,其横向性质会发生变化。产层厚度从几米到十几米不等,这给钻井和水平井布置过程中的储层圈定带来了很大的挑战。油田位于渤海湾断裂带,其中可能发生一些小断裂。但由于浅层气体对地震资料的影响导致信噪比较低,难以识别。此外,由于动态油藏生产、横向砂岩连接的不确定性以及可能的井间干预,砂岩包体中存在不均匀流动带单元。因此,这使得油水分布更加复杂,油水在砂包中接触不均匀。为了进一步了解复杂的通道砂层,将井筒置于有利的甜点位置并提高采收率,新开发的随钻可视化油藏描述集成技术与RSS(旋转导向系统)、HSVP(高速数据传输系统)、采用RTC(Internet远程传输连接)和OSC(作业支持中心)技术,优化了该油田三口井钻井作业的作业效率。这项新开发的储层表征技术是业内创新的全9分量方位电磁传播测量工具,它不仅可以提供常规的传播电阻率,还可以非常快速、灵活地提供地质信号响应。在其中一个案例中,独特的“双对角正交T-R天线设计”确保了DOI(调查深度)达到6.8米。对上、下、油水界面等储层边界进行了清晰的识别,并在有利产层内精确定位了水平排水段。井后储层表征结果与地震剖面相当,有助于了解储层动态流动带单元。优异的性能还体现在采油上;最初的产油量从40立方米/天增加到69立方米/天,比预期高出75%。正如预测的那样,原油采收率将至少提高25%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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