Abstract

This paper discusses the experience of and the solution to problems which have arisen concerning tubular products used by Mobil Oil Indonesia, Inc in Arun Field gas well completions.

Mobil Oil Indonesia has developed and implemented an intensive Tubular Quality Control Program to maximize the quality and integrity of the tubular products which are subjected to the extreme conditions of this prolific gas field. prolific gas field. The Tubular Quality Control Program which monitors the specified tubular quality from the steel mill to the rig floor has successfully maintained safe and dependable well operations with higher tubing integrity.

Introduction

Mobil Oil Indonesia, Inc's operating experience in the Arun gas Field has shown downhole failures result from the unique field producing conditions. These conditions demanded tubular products with greater integrity. Producing hot, sour gas from the Arun limestone, at high rates and Producing hot, sour gas from the Arun limestone, at high rates and pressures, subjects tubing to compressive and tensile forces which can pressures, subjects tubing to compressive and tensile forces which can exceed the strength of tubular connections.

This paper discusses the experience of and the solution to problems which have arisen concerning tubulars used in the Arun well completions. High annular pressures in the Arun wells suggested that tubing leaks were one of the problems. During workovers, the recovered tubing exhibited tubular defects such as connection leaks, internal and/or external pits, cracks and overlaps. This experience demonstrated the need for an improved system of tubular testing and quality control.

This paper focuses on the intensive testing and quality control program developed by Mobil Oil Indonesia, Inc to prevent similar future tubular failures. The Tubular Quality Control Program comprises manufacturing quality control, third party inspections, and improved transportation and handling procedures.

Since this program was implemented in 1981, the overall tubular rejection rate has been less than 5.0 percent. Most of the rejections occur as a result of thread damage inflicted during tubing installation. Approximately 0.6 percent ore rejected as a result of damage in transit, and third party inspection losses (mill defects) account for less than 1.6 percent. percent. p. 10–87 p. 10–87

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