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Artificial Lift Techbook 2016

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ARTIFICIAL LIFT TECHBOOK: CASE STUDY 44 | May 2016 | barrier, preventing chem- ical capillary lines to run into the inlet of the bottom- hole pump. Adding to this challenge is the way in which anchors are set. Conventional anchors require many turns of the production tubing during setting operation, which would in turn com- promise the capillary line. For wells that require a second barrier of well con- trol, specifcally requiring BOPs to be engaged, thread- ing capillary line through the wellhead is extremely unsafe and is in contraven- tion to the requirement. Solution A twofold improvement to the mechanical anchor design has been made to facilitate the successful application of the capillary line (Figure 1). Part one of the two- part solution includes a major redesign of the anchor body to provide suffcient annular area for the capillary line to bypass it and terminate into the rod pump beneath. It also included a major rede- sign to the setting system that only requires a quar- ter-turn to set the anchor. The capillary line is no longer in jeopardy during anchor setting procedure. Finally by adding a "catcher" capability, tubing is pre- vented from falling should it fail above the anchor. The second part to the solution was to develop a tool that allows the threading of the capillary line through the production tubing hanger with the BOPs engaged and placement of the production tubing string in tension with full well control. The Safe Tension Tool was developed to do just that (Figure 2). It is a patented telescopic tool that connects directly beneath the wellhead production tubing hanger. With BOPs installed with full well control, the tubing hanger and capillary line are pulled through the BOPs allowing the safe plumb- ing of the capillary line through the hanger. The hanger is then lowered back through the BOPs and into the wellhead. The system is then ready for setting the Quar- ter Turn Anchor/Catcher. Once the anchor is set the Safe Tension Tool is then pulled and retracted suffciently to place the entire production tub- ing string in tension without compromising the capillary line. History This system is now being used throughout North America. Examples range from successfully incor- porating the system in an entire feld to greatly reduce the effects of paraffn to the bottomhole rod pump, to enhancing the performance of problem- atic wells, and everything in between. It recently has been recognized as a solution by an operator in the Permian Basin. The appli- cation there required chemical to be conveyed toward the inlet of the reciprocating rod pump artifcial lift system so as to reduce the effects of scale buildup. Creating more value Reciprocating rod pump lift systems are by far the most popular artifcial lift system in the industry. Because of its popularity and effectiveness it con- tinues to be used in more extreme applications. A cost-effective chemical placement system helps rod pumping systems overcome the negative effects of corrosion, paraffn, scale, emulsion, and other rheological and mechanical challenges. The system will help improve operational performance of rod pump lift systems, reduce down time and enhance production volumes. n FIGURE 2. A capillary line extends past the Quarter Turn Anchor/Catcher terminating in the chemical injection sub beneath the rod pump. Tubing is set in tension with the Safe Tension Tool. (Image courtesy of Progressive Completions Ltd.)

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