C1 wellbore completion concepts

Designed & Presented by Mr ĐỖ QUANG KHÁNH, HCMUT 12/2010 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com  Completions: the interface between the reservoir and surface production  The role of the completion designer: to take a well that has been drilled and convert it into a safe and efficient production or injection conduit  Completion design: a mix of physics, chemistry, math., eng., geo., hydraulics, material science and practical hands-on wellsite experience => to balance the theoretical with the practical 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com  In the development of a hydrocarbon reservoir, a large number of wells are drilled and require to be completed, to allow the structure to be depleted However, the drilling and completion operations are crucial to the long term viability of the wells in meeting the specified objectives  The design and completion of both production and injection wells are required to satisfy a number of objectives including: 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com Provision of opt production/injection performance Ensure safety Maximise the integrity and reliability of the completion over the envisaged life of the completed well Minimise the total costs per unit volume of fluid produced or injected, i.e minimise the costs of initial completion, maintaining production and remedial measures  Depending upon the reservoir characteristics or development constraints, the completion may be required to fulfil other criteria, e.g to control sand production 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com  The design of a completion can therefore be assumed to proceed concurrently at two different levels The initial intention would be to produce a conceptual design, or a series of alternatives From these conceptual designs, one or more would be selected for more detailed development => a detailed design process would be pursued with the intention of producing a completion string design which specifies all components and also assesses the sensitivity of the well and completion performance to variations in the reservoir data used for the design 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com  The fundamental design of a completion consists of four principal decision areas, namely: Specification of the bottom hole completion technique Selection of the production conduit Assessment of completion string facilities Evaluation of well performance / productivityinjectivity 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com  Completion Design Strategy 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com  Team integration 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com  Data sources for completion design 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com  Economic influence of completions 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 10 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 11  Statement of requirements (SOR): • Pulling together the data the will be incorporated into design • Incorporate reservoir and production data and an expectation of what completion needs to achieve over the life of the field 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 12  Basis of design: • Outlines the main decisions made in the completion design & their justification • Forms the basis designed of reviews by colleagues, internal or external specialists & vendors • Includes the basic installation steps & design risk assessments • Includes major decisions s.a the requirement for sand control, stimulation, tubing size & artificial lift 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 13  Completion procedures • Installation procedures are reviewed and agreed by all parties involved • Reviews and issuing procedures should precede mobilization of equipment and personnel 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 14  Post-completion report • Reports well status in detailed • Reports results and lessons learnt • Includes a detailed schematic (with serial numbers, equip specifications, dimensions and depths), a tubing tally, pressure test details and plots, summaries of vendor reports, etc =>This document is critical for any engineer planning a later well intervention 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 15  Wells can be producers or injectors • can produce oil, gas and water • can inject hydrocarbon gas, water, steam and waste products • can be combined either simultaneously (e.g produce the tubing and inject down the annulus) or sequentially (produce hydrocarbons and then convert to water injection duty)  Completions are often divided into: • reservoir completion (connection between reservoir & well) and • upper completion (conduit from reservoir completion to surface facilities) 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 16  Major decisions in the reservoir completion are: • Well trajectory and inclination • Open hole vs cased hole • Sand control requirement and type of sand control • Stimulation (proppant or acid) • Single or multi-zone (commingle or selective) 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 17  Reservoir completion methods 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 18  Major decisions in the upper completion are • Artificial lift and type (gas lift, electrical pump, etc.) • Tubing size • Single or dual completion • Tubing isolation or not (packer or equivalent) 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 19  Upper completion methods 12/2013 Đỗ Quang Khánh – HoChiMinh City University of Technology Email: dqkhanh@hcmut.edu.vn or doquangkhanh@yahoo.com 20 ... water injection duty)  Completions are often divided into: • reservoir completion (connection between reservoir & well) and • upper completion (conduit from reservoir completion to surface facilities)... design of a completion consists of four principal decision areas, namely: Specification of the bottom hole completion technique Selection of the production conduit Assessment of completion string... reliability of the completion over the envisaged life of the completed well Minimise the total costs per unit volume of fluid produced or injected, i.e minimise the costs of initial completion, maintaining