Adaptation of Technologies Making Clean out Operations Environment Friendly and Cost Effective - Converting Failure into Success Using New Type of Fluidic Oscillator

Barzan Ahmed, F. A. Khoshnaw, Mustansar Raza, Hossam A. Elmoneim, Kamil Shehzad, Mustafa Sarbast, Omar El Zanaty, Serwer Yousif
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Abstract

A case study is presented detailing the methodology used to perform the clean-out operation in a water disposal well of Khurmala Field, Kurdistan Region of Iraq. Untreated disposed water caused scaling and plugging in perforated liner and in the open hole that eventually ceased injection. Multiple attempts and investments were made in recent years to resume access to the injection zone using high-pressure hydro-jetting tools coupled with acid treatments. However, these attempts yielded futile efforts. Before proceeding with the decision of workover, it was decided to go for one final attempt to regain wellbore access using Fluidic Oscillator (SFO). Fluidic Oscillator (SFO) having pulsing, cavitation and helix jetting action was used in combination with a train of fluids consisting of diesel, 28% HCl and gel. The clean out was performed in stages of 10m, to clean the fill from 1091m to 1170m. Since the well bore was initially isolated from the injection zone, the cleanout was conducted with non-nitrified fluids. As the cleanout progressed and access to the liner and open hole was regained, the circulation of insoluble fill to surface required a lighter carrying fluid. Nitrification, volume of the fluids, batch cycling, and ROP were designed considering the downhole dynamic changes expected during each stage of the operation. The combination of SFO, the thorough selection of treatment fluids and the accurate downhole hydraulics simulations pertaining to different stages of the operation offered an effective solution and regained the connectivity between the wellbore and the injection zone. The injection rate of water increased from 0 bpm at 700 psi to 15 bpm at 200 psi. Throughout this operation, the SFO helix, cavitation, and acoustic pulse (alike) jetting proved to be more effective than other single acting rotating jetting tools. Also, Environmental impact was reduced by eliminating the need for a rig workover operation. The matching of the injection pressure when the well was first completed and the post job value indicated that the complete zone was exposed and scale deposits were removed from the critical matrix or bypassed. SFO has an effective jetting near wellbore region, while the kinetic energy transferred via fluid makes the impact stronger in the deeper region. Internal mechanism of the tool allows it to handle high pumping rate and pressures, external finishing offer multi-port orientation of outflow that allows targeting the fill in desired directions. Presently the SFO used in the case study is the only technology that has pulse, cavitation, and helix jetting structure. Also, since the tool does not require redressing, it proves to be an efficient, safe and cost effective alternative
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清洁作业环境友好、成本效益高的技术适应——新型流体振荡器化失败为成功
介绍了一个案例研究,详细介绍了在伊拉克库尔德斯坦地区Khurmala油田污水处理井中进行清洗作业的方法。未经处理的水会导致射孔尾管结垢和堵塞,最终导致裸眼井停止注入。近年来,为了利用高压水力喷射工具和酸处理措施恢复注入层的通道,进行了多次尝试和投资。然而,这些尝试都是徒劳的。在决定进行修井之前,决定使用流体振荡器(SFO)进行最后一次尝试,以恢复井筒通道。流体振荡器(SFO)具有脉冲、空化和螺旋喷射作用,与柴油、28%盐酸和凝胶组成的流体组合使用。清理分10米阶段进行,清理填充物从1091米至1170米。由于井筒最初与注入区隔离,因此使用非硝化流体进行清洗。随着洗井的进行和尾管和裸眼的恢复,不溶性充填物循环到地面需要更轻的携带液。在设计硝化作用、流体体积、间歇循环和ROP时,考虑了每个作业阶段预期的井下动态变化。SFO、处理液的全面选择以及针对不同作业阶段的精确井下水力模拟相结合,提供了有效的解决方案,并恢复了井筒与注入层之间的连通性。注水速度从700 psi时的0 bpm增加到200 psi时的15 bpm。在整个作业过程中,SFO螺旋、空化和声脉冲(类似的)射流被证明比其他单作用旋转射流工具更有效。此外,由于无需进行钻机修井作业,减少了对环境的影响。首次完井时的注入压力与作业后的数值相匹配,表明整个地层已被暴露,结垢沉积物已从临界基质中移除或绕过。SFO在近井筒区域具有有效的喷射作用,而流体传递的动能使深层区域的冲击作用更强。该工具的内部机构使其能够处理高泵速和高压力,外部精加工提供多端口流出方向,使充填物能够瞄准所需的方向。目前,案例研究中使用的SFO是唯一具有脉冲、空化和螺旋射流结构的技术。此外,由于该工具不需要修复,因此它被证明是一种高效、安全且经济的替代方案
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