首次在中东地区应用WASP®技术进行非常规油井增产处理:现场案例

Arafa Al Harthy, Khalid Al Habsi, Khalid Al Hinai, Stuart Walley
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引用次数: 0

摘要

长期以来,油气井一直采用常规的增产措施来消除地层损伤或结皮,以提高油井产量并达到经济效益。电缆应用脉冲增产(WASP®)是一项突出的新技术,在采油井和注水井的增产作业中获得了越来越多的应用。WASP是一种电液技术,可在整个期望井段内产生可重复的高功率液压脉冲。重复的脉冲刺激近井区域,破坏结垢并造成地层岩石的拉伸破坏,从而为新的流道创造微型裂缝/裂缝,并消除由结垢、细粒等造成的地层损害或表皮,这些结垢、细粒等会堵塞射孔、开槽衬管、防砂筛管或砾石充填,从而提高流入量。Petrogas勘探与开发公司最近在阿曼油田南部的4口直井中进行了WASP®试验,这是该公司在中东地区的首次应用。这些井分别是井a、井b、井c和井d。直井在Gharif和Al Khlata砂岩油藏上完成,该油藏含相对中等的油,粘度范围为44-239 cP。除b井采用砾石充填完井外,所有产层都进行了射孔。这些井采用了人工举升,包括PCP泵和带抛光杆管柱的束流泵。据了解,候选井的低产量是由于砾石充填损坏和射孔堵塞造成的高表皮造成的。WASP®工具的规格为直径2.750英寸,长度约为11.6米。使用标准的测井车进行电缆传输。WASP®处理作业的结果喜忧参半,但总体而言,a /B井、c井和d井的油井性能有所改善,从而提高了产油量。事实上,Aseel油田的c井的产量提高了三倍多,这是一个显著的进步。其他井仍处于监测阶段。WASP®的作业性能非常顺利,没有出现任何操作问题,也没有在所有作业中浪费时间。WASP®技术证明,它是常规增产方法的一种有吸引力的替代方法,常规增产方法包括使用水力压裂和注入酸、溶剂和破乳剂。这些常规增产方法在产层处理和作业强度方面存在局限性。事实证明,WASP技术更有效、更安全(符合HSE标准)、耗时更短,因此具有成本效益。Petrogas目前正在考虑将WASP®技术应用于注水井。
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The First Middle East Unconventional Well Stimulation Treatment by Applying WASP® Technology: Field Cases
The conventional well stimulation treatments have been used in the oil and gas wells for long time to remove formation damage or skin in order to enhance the well production and be able to achieve economic rates. Wireline Applied Stimulation Pulsing (WASP®) is a prominent new technology that is gaining more grounds in the well stimulation for oil producer and water injector wells. WASP® is an electro-hydraulic technology that generates repeatable, high power hydraulic pressure pulses downhole over the entire desired interval. The repeated pulsing stimulates the near wellbore area, breaks up scale and causing tensile failures in formation rock, thus creating mini fractures/fissures for new flow paths and removing formation damage or skin caused by scale, fines etc. that were blocking perforations, slotted liners, sand screens or gravel packs, resulting in improved inflow. Petrogas Exploration and Development recently conducted a WASP® campaign trial that is the first application in the middle east in four vertical wells in the south of Oman oil fields. The wells were Well-A, Well-B, Well-C and Well-D. The vertical wells were completed on the Gharif and Al Khlata sandstone oil reservoirs, which contain relatively medium oil with a viscosity range of 44-239 cP. All the pay zones were perforated, except for Well-B which was completed with gravel pack. The wells were completed with artificial lift including PCP pumps and beam pumps with polish rod strings. It was understood that the poor/low production performance of the candidate wells was due to the high skin, caused by the damaged gravel pack and plugged perforations. The WASP® tool specifications that was run for the treatments of the wells were 2.750" in diameter, and the length was approximately 11.6 m. The conveyance was on electrical wireline cable by using a standard logging truck. The results of the WASP® treatments jobs have shown mixed results but generally Well-A/B, Well-C and Well-D showed improvement in well performance and consequently in the oil gains. In fact, in Well-C in Aseel field had the highest production rate increased by more than threefold - a remarkable improvement. The other wells are still in the monitoring stage. The operation performance of WASP® treatments went smoothly without any operational issues or lost time in all the jobs. WASP® technology demonstrated that it is an attractive alternative method to the conventional well stimulation methods that involve the use of hydraulic fracturing and injection of acid, solvents and deimulsifiers. These conventional well stimulation methods have limitations in the treatment of the pay zone and operationally intensive. WASP® technology is proven to be more effective, safe (HSE compliant), less time consuming and thus cost effective. Petrogas is now considering applying the WASP® technology to the water injectors.
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