Abstract

The Cable Deployed Pumping System (CDPS) is designed to reduce the cost of operating electric submersible pumps. It offers a new completion approach for cost-efficient, high rate enhanced oil production. Designed for adaptive versatility, the system is compatible with both standard and inverted electric submersible pump (ESP) configurations. New advances in cable design, well completion technology and cable-handling equipment have been combined to create a simple and reliable system. New subsurface electrical penetration methods utilizing novel pressure balancing techniques expand the performance limitations of existing conventional designs. Other advantages of the system include shorter time interval requirements for pump changes and size reduction of the service package, making a CDPS workover more feasible in "hostile" or remote locations. With petroleum industry support, an operational prototype system was manufactured and tested. prototype system was manufactured and tested. Recent developments in the adaptation of inverted ESP equipment offer the potential of simplified cable deployed componentry easier and faster to install. The utilization of hydraulic control lines in the CAPS Cable offers the potential for increasing pump longevity. potential for increasing pump longevity. This paper covers the principal components of CDPS, and includes typical downhole completion arrangements for both conventional and inverted ESP configurations.

Introduction

Deploying submersible pumps from electrical support cables has long been recognized as an opportunity for a more cost-effective alternative to conventional tubing deployment in many production situations. Cable deployment combines the advantages of faster installation and retrieval with smaller workover equipment. These features can be significant in many applications, such as:

Platforms: where it can eliminate the need to interrupt drilling operations to service ESPs.

Remote Locations: where it is difficult to transport derricks to locations causing long delays and lost production.

Subsea Completions: where deployment from service vessels combined with subsea wet connectors now being developed, promises to allow the use of ESPs in these applications for the first time.

A unique high-strength CAPS Cable utilizing specialized materials has made it possible to deploy ESPs using a modified, field-proven reeled tubing injector. A full scale cable deployed pumping system has been successfully evaluated in a test well. Ongoing work has increased CDPS versatility to include both conventional and inverted ESP units. In addition, several different wellhead completion options are now available, and specific completion arrangements have been designed to meet a wide variety of production requirements.

Continuing development of this technology offers new opportunities for high-volume artificial lift applications to benefit from the many advantages of ESPs.

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