Electrical Submersible Pumps (ESPs) are the most common used artificial lift method in Kuwait. The life data analysis of an ESP is important in design, operation, and to meet the deliverability of the reservoir. Weibull Reliability combined with the Dynamic Average Equipment Run-Life (DAERL) allows to construct confidence intervals for the survival of ESP system based on equipment, design information, reservoir data, and operating performance. Statistical methodology using a combination of Weibull and DAERL is developed and applied to a data set which covers all ESP systems installed in Kuwait with over 8 years of data covering 5,000 ESP installations. Through the addition of operating history data (including the number of trips and the specific reasons of trips) into the analysis provides a more accurate reliability measure of running wells today. The primary advantage of Weibull analysis is the ability to provide reasonably accurate failure analysis and failure forecasts with small samples. By performing linear regression, parameter estimates can be obtained that will enable to interpret the survival of an ESP system based on equipment, reservoir, and operating information. Weibull Analysis shows better and more accurate results than an average method of reliability in evaluating ESP system performance. The DAERL analysis looks at the overall run life of a group of wells (operating and non-operating) and the change in performance over time. Cross comparisons of equipment types (such as round cable instead of flat cable) yield results of a longer expected run life and higher reliability. The paper shows that in most cases both Weibull and DAERL show similar performance trends, but the value of the results presented for each has different applications. The effect of survivability in this study is applied on different types of ESP surface and downhole equipment, reservoir data, failure reasons, and the operating history. The results of the analysis generate recommendations that are used to improve performance of both current running ESP wells and future ESPs to be installed. One of the major priorities of the authors in this study was to use the results to better operate running wells today, by measuring the average days between shutdowns combined with Weibull reliability, an analysis tool is built to higlight specific wells that are at risk of failure.

The robust construction, ease of operation and maintenance of Sucker Rod Pump (SRP) is a stand-alone artificial lift method owning mostly to its simplicity. SRP are widely used positive displacement pump in land and offshore oilfield applications for lifting of heavy, medium or light oil with gas and water. In this paper, one such implementation of SRP is discussed which are simulated for rigless installation with insert anchor in existing failed artificial lift system. The failure of existing artificial lift system such as PCP, ESP or even SRP itself. Causes loss of cumulative production of the asset and thus economic disadvantage. The scheduling of rig to carry replacement based on oil priority further effects this interval which are generally overlooked. In this paper, implementation of SRP in such existing failed artificial lift system is discussed, carried rigless using insert anchor pump. Thus continuation of maintenance of asset production even after failure of artificial lift system. Such rigless installation opens window preferably of installations carried in wells with lower than expected productivity index. Which may have caused the existing system failure due to operation not being in the pumping range. In this paper, firstly simulation is carried as per the well test of recent failed artificial lift system for maximum production rate with maximum plunger size of the existing tubing size for insert anchor and flowing bottom hole pressure (FBHP). Secondly, rigless installation with economic advantage in comparison to installation with rig is discussed. Thirdly, the successful completion of installing SRP in 3 ½" tubing rigless is discussed with various existing failed artificial lift system. The paper evaluates for design and installation of artificial lift method of SRP through rigless flush-by unit with schematics in failed existing artificial lift system. Generally, with passage of time the formation productivity index drops due to various reasons. Thus the added advantage of resetting the pump at any depth along the production tubing, assists further in the location for minimum free gas percentage and hence extended run life, based on actual well test data and fluid level survey. The comparative results between the existing and new installation remain as a database for advantage in scheduling of rigless installation for optimum production. The design results are extensively discussed with schematics for effective rod stress, torque, rod and surface unit loading for a range of production rate.