Artificial Lift Techbook 2018

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48 | July 2018 | ARTIFICIAL LIFT: CASE STUDIES the elastomers, which were not rated for tempera- tures below 50 C (122 F), and subsequent damage to the O-ring seals. In a move to eliminate the prob- lem, the operator selected the production life-cycle management service to help maintain an acceptable downhole temperature while performing the scale squeezes to avoid leakage past the seals. Using information from the DIFA team, pro- duction engineers at the U.K. ALSC implemented a proactive surveillance plan to remotely moni- tor downhole temperature data from gauges on the ESPs and surveil wells during all scale squeeze operations. If the well temperature dropped below 70 C (158 F), the ALSC engineers advised field engineers at the offshore well site to reduce the inject rate of the scale squeeze by 15%. If the well temperature reached 122 F, the lowest threshold of the elastomers, the ALSC engineers would notify the field engineers to pause the operation until the temperature stabilized to maintain the integrity of the seals and prevent an ESP failure (Figure 2). Since the operator began using the production life-cycle management service, a total of 157 scale squeeze treatments have been performed on 54 wells with no subsequent ESP failures. Through collaboration with the DIFA team to determine the cause of the failures, and ongoing cooperation between the ALSC and well services field engineers to continuously monitor well temperature and adjust pumping protocols, no well has dropped below the minimum acceptable temperature and the operator has saved millions of dollars in work- over costs. Since the production life-cycle management service was launched in March 2017, it has been implemented by more than 200 companies in more than 30 countries where it has improved run times, reduced costs and improved productivity by moni- toring single wells to optimizing operations across entire fields. Operators can customize the service, choosing from four service tiers, all with ALSC access. The first level includes visualization and system protection while the second provides pro- active ESP management. The third and fourth tiers identify potential wells and fields for production optimization. In addition to long-term monitoring and analysis, the service monitors the important commissioning phase of an artificial lift system. n FIGURE 2. ALSC engineers notify field engineers when the intake temperature of the well drops to 158 F during a scale squeeze. Field engineers then reduced the pumping rate to stabilize the temperature, which prevents the degradation of the elastomers that can lead to ESP failure. (Image courtesy of Schlumberger)

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