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AccessESP, Greene Tweed pair on development of advanced "power delivery" system to improve ESP reliability

ESP connector assembly

AccessESP, a Houston-based provider of rigless electrical submersible pump (ESP) conveyance solutions for the global oil industry, developed a retrieval technology that reduces costs by enabling quick and easy ESP installation and retrieval using slickline, wireline, or coiled tubing.

The system eliminates the need for a workover rig to pull and reinstall an ESP, lowering intervention costs and minimizing lost production.

AccessESP's unique solution is based on technologies with long-standing use in oilfields and other industries.  The company's key innovation has been to integrate these proven technologies into a radically simplified, rigless conveyance solution, differentiated by using a proprietary, high power density, high efficiency, permanent magnet motor.

The Challenge

AccessESP's Reliability Management initiative demanded the development of a new advanced "power delivery" system to eliminate conventional ESP electrical connectors and cable performance weaknesses.

As the provider of the most effective solution in the market, AccessESP permanent magnet motors are capable of operating from low horsepower up to 1,300 hp, necessitating the engineering of a robust, customized, bulkhead connector system rated up to 8.6 kV phase-phase, and a continuous operating temperature of up to 400°F (204°C). 

Addressing AccessESP's demanding voltage creep requirements, as well as their high-temperature and high-pressure requirements, meant forsaking a typical connector design that used metal load washers. As a conductive material, metal could introduce a pathway to voltage breakdown. To improve reliability, AccessESP required a thermoplastic load washer that could provide the mechanical support traditionally expected from a metal washer.

Given the customer's highly specific material and technology needs and their desire for a global company with a local presence to foster a collaborative and responsive relationship, AccessESP contacted Greene Tweed.

The Solution

After reviewing the application requirements and understanding AccessESP's concerns regarding voltage and creep distance, Greene Tweed proposed a Seal-Connect solution for the connector assembly, using a combination of its high-performance materials, including Arlon 1000, Arlon 3000 XT, and Chemraz 629. 

Arlon 1000, Greene Tweed's non-filled PEEK material, a market leader for its combination of mechanical, thermal, chemical, and electrical properties, was chosen for the body of the electrical connector. Chemraz 629, a perfluoroelastomer, was recommended for its high-temperature and electrical insulative properties for the seal between the bulkhead and contact block interface. 

The company recommended Arlon 3000 XT, Greene Tweed's exclusive, non-filled, cross-linked PEEK, as a solution to address AccessESP's concerns regarding voltage creep and tracking distance. Arlon 3000 XT, patented by Greene Tweed, provides improved volume resistivity 30 times that of PEK at 400°F (204°C) and dielectric strength, measured at 730 V/mil in an ASTM D149 testing. 

In addition, Arlon 3000 XT has 1.5 to 6 times higher mechanical properties compared to PEEK in tensile, compressive, flexural, and shear tests at a test range of 392°F to 500°F (200°C to 260°C), which enabled the company to design a load washer offering the support typically provided by a metal element. Arlon 3000 XT was also used for insulator sleeves on the bulkhead connector.

The Results

Arlon 3000 XT's best-in-class combination of electrical and mechanical properties provided AccessESP with a connector that demonstrated significantly improved performance over existing PEEK and PEK materials in an over-molded solution. 

"Greene Tweed is pleased to partner with AccessESP engineering," said Ericka Richardson, Sales Representative. "Our collaboration enabled us to share critical information that helped expedite the successful development of this innovative, next-generation product."

Greene Tweed's Seal-Connect solution passed all acceptance tests under IEC 60502-1 and API 11S6 standards for a 5-kV rated connector. Furthermore, the use of Arlon 3000 XT lengthened the creepage distance between the pins, enabling the connector to pass the 5-minute, 13-kV AC test at 300°F (149°C).

"We continue to be pleased with Greene Tweed's proposed Seal-Connect solution for the connector assembly," said David Malone, AccessESP CEO. "This connector provided us with the required performance in order to guarantee a long and safe life with extremely high levels of reliability." 

This agile client/customer collaboration, along with Greene Tweed's proprietary materials portfolio and engineering and design expertise, provided AccessESP a customized connector solution that improved the performance of their innovative ESP system. 

Company info

3656 Westchase Drive
Houston, TX
US, 77042

Website:
accessesp.com

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