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Every field development faces the challenge of keeping capital and operational expenditures (CAPEX and OPEX) within reasonable limits, while at the same time exploring matured or new technology that can achieve cost limit objectives. With the uncertainties, cyclic nature, instability in the oil and gas global investment markets, and the fluctuation in crude oil pricing, operators in energy exploration and production (E&P) industries as well as service providers are constantly looking for better and more efficient cost-saving products and services. The challenge of maximizing hydrocarbon recovery in deepwater completions with minimum investment, while maintaining the highest level of health, safety, and environment (HSE) and service quality is a continual catalyst for new products and service delivery techniques. In the operator’s Bonga subsea field, the conventional completions techniques for all open hole standalone screen (SAS) completion installations are performed in multiple trips. The first trip involves running the lower completion including a gravel pack packer with screen assembly which allows a gravel pack packer service tool and an internal string with a pump-thru wash-down capability to enable toe-heel circulation, packer setting, and testing. The internal string, which is comprised of the packer setting tool, internal wash pipe, and accessories, is recovered after completion of the first trip into the open hole reservoir section. The second trip involves running the production tubing, production packer, downhole gauge mandrel, safety valve, and other completions accessories and landing the production string into the lower completion and on the tubing hanger. The major objectives and drivers for the innovative open hole single trip stand-alone screen completion (STC-SAS) in a deep offshore environment is basically to save rig costs, use proven and emerging technologies, employ completions best practices, reduce exposure of personnel to safety hazards, and reduce non-productive times (NPT). New completions techniques with different services and product providers could pose a challenge in terms of vendor interface management, equipment compatibility, and procedural integration of multiple downhole tools with different operating boundaries and limits. The STC-SAS completions concept in deep water was generated with the operator’s Wells Front End Completion and Well Intervention team in December 2015. This was driven by an opportunity to further reduce well delivery rig time which is at a premium in deepwater subsea completions. The average completions time in the field stood at 10 days per 10,000 ft well. The group was challenged to further improve the well delivery time. However, there was no benchmark as the industry data showed that a single trip open hole stand-alone screen completion had not been installed globally in a deep water subsea environment. This paper presents the evolution of the completions design, the critical challenges in the service companies management, downhole equipment interfaces, operational steps, risks, and the lessons learned during the job execution that led to the successful installation of the industry’s first single trip open hole sandface STC-SAS in a deep water environment.
Every field development faces the challenge of keeping capital and operational expenditures (CAPEX and OPEX) within reasonable limits, while at the same time exploring matured or new technology that can achieve cost limit objectives. With the uncertainties, cyclic nature, instability in the oil and gas global investment markets, and the fluctuation in crude oil pricing, operators in energy exploration and production (E&P) industries as well as service providers are constantly looking for better and more efficient cost-saving products and services. The challenge of maximizing hydrocarbon recovery in deepwater completions with minimum investment, while maintaining the highest level of health, safety, and environment (HSE) and service quality is a continual catalyst for new products and service delivery techniques. In the operator’s Bonga subsea field, the conventional completions techniques for all open hole standalone screen (SAS) completion installations are performed in multiple trips. The first trip involves running the lower completion including a gravel pack packer with screen assembly which allows a gravel pack packer service tool and an internal string with a pump-thru wash-down capability to enable toe-heel circulation, packer setting, and testing. The internal string, which is comprised of the packer setting tool, internal wash pipe, and accessories, is recovered after completion of the first trip into the open hole reservoir section. The second trip involves running the production tubing, production packer, downhole gauge mandrel, safety valve, and other completions accessories and landing the production string into the lower completion and on the tubing hanger. The major objectives and drivers for the innovative open hole single trip stand-alone screen completion (STC-SAS) in a deep offshore environment is basically to save rig costs, use proven and emerging technologies, employ completions best practices, reduce exposure of personnel to safety hazards, and reduce non-productive times (NPT). New completions techniques with different services and product providers could pose a challenge in terms of vendor interface management, equipment compatibility, and procedural integration of multiple downhole tools with different operating boundaries and limits. The STC-SAS completions concept in deep water was generated with the operator’s Wells Front End Completion and Well Intervention team in December 2015. This was driven by an opportunity to further reduce well delivery rig time which is at a premium in deepwater subsea completions. The average completions time in the field stood at 10 days per 10,000 ft well. The group was challenged to further improve the well delivery time. However, there was no benchmark as the industry data showed that a single trip open hole stand-alone screen completion had not been installed globally in a deep water subsea environment. This paper presents the evolution of the completions design, the critical challenges in the service companies management, downhole equipment interfaces, operational steps, risks, and the lessons learned during the job execution that led to the successful installation of the industry’s first single trip open hole sandface STC-SAS in a deep water environment.
This paper addresses the hurdles that have prevented the single-trip installation of upper and lower completions in the complex world of subsea and deepwater applications. It examines the processes, technologies, and risk mitigation steps that took a concept from pilot to successful deployment This paper examines the current practice and rationales that had dictated a near 30-year industry standard methodology. This was not a case of tearing up the rule book, but of re-writing certain chapters. Our study examines the methods used to evaluate risks, mitigate same, test thought processes through to systems integration testing, and ultimately take what was a complete-the-well-on-paper exercise to a complete-the-well-in-practice outcome. The study will look at novel and not-so-novel technologies deployed; why were they chosen and how were they qualified. Offshore and deepwater activity is returning; cost control, better project management and new technologies have provided a step-change in project economics. Typically, the completion of certain deepwater wells will necessitate the separate deployment of sand face, intermediate and upper completion. But what would result if this could be done in a single trip? In the simplest terms, completing in a single trip reduces the overall completion time by half and more. The case against is well founded; building the case for the change of long-established methods in our industry has never been an easy task. The steps taken to build this case will be examined, how fear of the new was overcome, and, having established proof-of-concept and beyond, taking the project to a fruitful outcome will be explored. However, what will be explored is no silver bullet, has no universal appeal and requires diligence, planning and contingency to drive success. But the prize is there, the risks can be mitigated, and when successful, will deliver an impact on project economics that very few technologies and techniques have delivered on such a scale.
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