Blast from the Past, Solving Severe Congealed Oil Problems by Combining Existing Solutions

Tirza Hahijary, A. Kusuma, J. Jenie
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Abstract

A mature field in central Sumatra, Indonesia, has been producing heavy oil for decades, and it has shown decreased production. The ESP, as the main lifting method, needs to be replaced more frequently due to mechanical damage by congealed oil. Many wells in that field were forced to be deactivated because of congealed oil plugging along the wellbore. The conventional method to tackle this issue is to pump hot water. This practice however did not give sustainable results after the treatment. The remedy of coiled tubing (CT) well cleanout with a wash nozzle has also not been considered successful because the congealed oil is too hard to penetrate. Furthermore, using mechanical devices such as CT milling tools has not been effective because the deposits stick to the mill. Considering the low-production-rate wells, high-rate fluid injection was proposed to meet cost criteria. Although the well was able to produce afterwards, production kept declining due to the production of congealed oil from the formation. A combination of high-pressure jetting tool and organic dissolver fluid was proposed as an alternative method to break the congealed oil. The method uses kinetic energy from the jetting tool to shatter the solidified oil by pumping brine. Afterwards, a fluid mixture composed of organic dissolver and additive is pumped to dissolve the remaining congealed oil. Following the treatments, the pilot well showed significant improvements. The treatment successfully revived well production after the well had stopped producing for more than 3 months. The flowback tank was filled with as much as 10-in.-deep broken oil residue. Such a solid removal has not been accomplished with any other technique. The well has been producing for more than 10 months without any pump issues, and production continues to increase. Another three well candidates with low productivity issues were treated with the same technique. All the wells delivered good results. If, in the future, the congealed oil accumulates again, high-pressure jetting and organic dissolver will be the first method used for remediation. All the wells treated with this approach have been producing significantly more than those treated using any other technique, well beyond the target set by the operator. This study discusses the benefits of combining the techniques of high-pressure jetting, organic dissolver, and high-rate injection to overcome severe congealed oil problems that impair well production. Details the approach are provided, and its effectiveness is compared to other former attempts to solve the congealed oil problem. This case also illustrates the importance of maintaining well interventions to improve production while meeting the cost criteria in this challenging time in the oil and gas industry.
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从过去的冲击,结合现有的解决方案解决严重的凝结油问题
印度尼西亚苏门答腊岛中部的一个成熟油田已经生产了几十年的重油,但产量有所下降。ESP作为主要的举升方式,由于油的凝结造成机械损伤,需要更频繁地更换。该油田的许多井由于沿井筒的油堵塞而被迫停产。解决这个问题的传统方法是泵热水。然而,这种做法在治疗后并没有得到持续的结果。使用清洗喷嘴进行连续油管(CT)洗井的补救措施也被认为是不成功的,因为凝结的油太难穿透。此外,使用连续油管铣削工具等机械设备并不有效,因为沉积物会粘在铣刀上。考虑到产能较低的井,为满足成本要求,建议采用大排量注液。尽管这口井后来能够生产,但由于地层中产生了凝结油,产量不断下降。提出了高压喷射工具与有机溶解液相结合的破油方法。该方法利用喷射工具的动能,通过泵送盐水来粉碎固化油。然后,泵送一种由有机溶解剂和添加剂组成的液体混合物,以溶解剩余的凝结油。经过处理后,该试验井表现出了显著的改善。在油井停产3个多月后,该处理措施成功恢复了油井的生产。返排罐中装满了高达10英寸的液体。-深层破碎的油渣。这样的固体去除还没有完成任何其他技术。这口井已经生产了10个多月,没有出现任何泵问题,而且产量还在继续增加。另外3口产能较低的候选井也采用了同样的技术。所有的井都取得了良好的效果。如果将来冷凝油再次聚集,高压喷射和有机溶解剂将是修复的首选方法。采用这种方法处理的所有井的产量都明显高于使用其他技术处理的井,远远超出了作业者设定的目标。本研究讨论了高压喷射、有机溶解剂和高速注入技术相结合的优势,以克服严重的凝结油问题,这些问题影响了油井的生产。详细介绍了该方法,并与以往解决凝结油问题的方法进行了比较。该案例也说明了在石油和天然气行业充满挑战的时期,在满足成本标准的同时,维持油井干预措施对于提高产量的重要性。
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