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DACC IRP Volume #02 - Completing and Servicing Critical Sour Wells

Completing and Servicing Sour Wells Industry Recommended Practice enhances safe operations by providing information and recommendations for the completing and servicing of critical sour wells.

A draft of edition 3 of this IRP is currently available for industry review.

January 1, 2007

The Wellhead section addresses the installation, operation and maintenance of wellheads and wellhead related equipment during initial completions, re-completions, or subsequent production operations of critical sour gas or oil wells.

The service rig BOP Equipment section addresses the surface BOP equipment, including BOP stack configuration, manifolding, accumulator, tubing safety valve, heating of equipment, quality assurance, and installation and operation. Downhole Equipment is installed in producing critical sour wells to enhance production and/or provide additional well security. The downhole equipment section focuses attention on those procedures, which may affect the security of the well. The number of tools available is too diversified to be individually addressed and have been grouped into commonly recognized categories, such as packers, nipples, safety valves, etc.

The Tubular Goods section includes recommendations that will reduce the probability of an uncontrolled flow of H2S in a critical sour well. A tubing failure alone will not directly result in an uncontrolled flow, but will result in a workover operation. During this operation, the risk of an uncontrolled flow increases, and is the focus of the recommendations.

The Fluids and Circulating System section addresses the minimum acceptable standards for equipment and completion/servicing fluids for well control and fluid handling on critical sour wells.

The Electrical Wireline (braided wireline) operations section includes recommendations regarding the equipment integrity during completing/servicing operations, which forms an integral part of the pressure control equipment directly attached to the BOP stack or wellhead.

Key issues relating to Slickline equipment requirements include rigging in procedures, pressure testing, equipment servicing and reporting, technical information relating to mechanical properties and strengths, and operational considerations associated with the equipment.

A Quality Control program must be implemented to ensure that the pressure control equipment utilized during completing and servicing operations is suitable for the intended service, and addresses non-API equipment as well as API equipment. The Elastomer Guideline Selection IRP is intended to assist well operators in selecting elastomers used for well pressure seals, and addresses service and environmental conditions on seal material. Plastic and metal- to-metal seals are not included in this IRP section.

The Safety section details minimum standards and practices for completing and servicing operations with the wellhead installed or wellhead removed.

The Suspension Practices section outlines suspension methods for both newly drilled wells and completed wells to preserve the integrity of the wellbore and to maintain downhole equipment, tubular goods, and wellhead equipment to permit safe re-entry of a suspended critical sour well.

The Wellsite Personnel Training section provides guidelines with regard to training and experience levels for personnel working on completing/servicing critical sour wells to carry out each level of operation in a safe, competent manner.

Developer: DACC
Sponsor Organization: CAPP
Current Status: Sanctioned April 2006, Published January 2007

This IRP has been officially sanctioned by all parties and is in final form.

Energy Safety Canada welcomes comments at any time on any of these documents. Comments are considered on the basis of clarity, intent, accuracy, or omissions. ALL comments are passed on to the committee chair or held until the next scheduled review, as appropriate.

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