Development and Implementation of the Method of Cementing Production Casing 178 mm with Pressure on the Cement Slurry on the East Part of the Orenburg Oil and Gas Condensate Field

Maxim Viktorovich Miklyaev, Ivan Denisov, Ivan Mikhailovich Gavrilin
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Abstract

Well construction in the Volga-Ural Region faces different sorts of complications, the most common ones being the loss of drilling fluids and rockslides. Such complications may cause considerable financial losses due to non-productive time (NPT) and longer well construction periods. Moreover, there are complications, which might occur both during well construction and during its exploitation. The commonest complications are sustained casing pressure (SCP) and annular flow. The complications, which occur when operating a well, also have a negative effect on the economic efficiency of well operation and call for additional actions, for example, repair and insulation works, which require well shutdown and killing, though a desired outcome still cannot be guaranteed; moreover, it is possible that several different operations may have to be carried out. In addition, the occurrence of SCP during well life is one of the most crucial problems that may cause well abandonment due to high risks posed by its operation. It is known that the main reasons for SCP are as follows: Channels in cement stone Casing leaks Leaks in wellhead connections To resolve the problem of cement stone channeling, several measures were taken, such as revising cement slurry designs, cutting time for setting strings on slips, applying two-stage cementing, etc. These measures were not successful, besides, they caused additional expenses for extra equipment (for example, a cementer). In order to reduce the risk of cement stone channeling, a cementing method is required that will allow to apply excess pressure on cement slurry during the period of transition and early strength development. To achieve this goal, a well-known method of controlled pressure cementing may be applied. Its main drawback, however, is that it requires much extra equipment, thus increasing operation expenses. In addition, the abovementioned method allows affecting the cement stone only during the operation process and / or during the waiting on cement (WOC) time. Upon receiving the results of the implemented measures and considering the existing technologies and evaluating the economic efficiency, the need was flagged for developing a combined cementing method. The goal of this method is to modify the production string cementing method with a view to applying excess pressure on cement stone during strength development and throughout the well lifecycle. The introduction of this lining method does not lead to an increase in well construction costs and considerably reduces the risks of losing a well from the production well stock.
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Orenburg东部凝析油田178 mm生产套管高压水泥浆固井方法的开发与实施
伏尔加-乌拉尔地区的油井建设面临着各种各样的复杂问题,最常见的是钻井液损失和岩崩。由于非生产时间(NPT)和较长的建井周期,这些复杂问题可能会造成相当大的经济损失。此外,在建井和开采过程中都可能出现复杂的问题。最常见的并发症是持续套管压力(SCP)和环空流动。作业过程中出现的并发症也会对井的经济效益产生负面影响,并需要采取额外的措施,例如修复和隔离工作,这些工作需要关井和压井,尽管仍然不能保证预期的结果;此外,可能需要进行几种不同的操作。此外,SCP在井寿命期间的发生是导致弃井的最关键问题之一,因为其操作具有很高的风险。据了解,造成SCP的主要原因有:水泥石窜槽套管泄漏井口连接处泄漏针对水泥石窜槽问题,采取了修改水泥浆设计、缩短卡瓦上管柱下入时间、采用两段固井等措施。这些措施并不成功,而且造成额外设备的额外费用(例如,水泥中心)。为了降低水泥石窜流的风险,需要一种能够在过渡和早期强度发展期间对水泥浆施加超压的固井方法。为了实现这一目标,可以采用一种众所周知的控制压固井方法。然而,它的主要缺点是需要额外的设备,从而增加了运营费用。此外,上述方法仅允许在操作过程和/或等待水泥(WOC)时间期间影响水泥石。在收到实施措施的结果,并考虑到现有技术和评估经济效益后,需要开发一种联合固井方法。该方法的目标是改进生产管柱固井方法,以期在强度开发期间和整个井生命周期内对水泥石施加超压。采用这种衬管方法不会导致建井成本的增加,并且大大降低了生产井库存损失一口井的风险。
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