Challenges in Completing Long Horizontal Wells Selectively
- Imran Abbasy (Santos Limited) | Barry Ritchie (Maersk Oil Qatar) | Michael J. Pitts (Maersk Oil Qatar) | Brendan J. White (Maersk Oil Qatar) | M. Rushdan Jaafar (Qatar Petroleum)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- June 2010
- Document Type
- Journal Paper
- 199 - 209
- 2010. Society of Petroleum Engineers
- 1.10 Drilling Equipment, 2 Well Completion, 5.1.5 Geologic Modeling, 2.2.2 Perforating, 2.3 Completion Monitoring Systems/Intelligent Wells, 5.1.2 Faults and Fracture Characterisation, 3 Production and Well Operations, 5.8.7 Carbonate Reservoir, 5.2 Reservoir Fluid Dynamics, 2.3.3 Flow Control Equipment, 3.2.2 Downhole intervention and remediation (including wireline and coiled tubing), 1.11 Drilling Fluids and Materials, 1.7.5 Well Control, 1.14 Casing and Cementing, 4.5.7 Controls and Umbilicals, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.2.3 Rock properties, 3.3.1 Production Logging, 3.2.5 Produced Sand / Solids Management and Control, 4.1.5 Processing Equipment, 1.6.1 Drilling Operation Management, 1.6.10 Running and Setting Casing, 7.1.7 Intergated Asset Management, 1.8 Formation Damage, 2.4.3 Sand/Solids Control, 1.6 Drilling Operations, 1.1 Well Planning, 4.1.2 Separation and Treating
- completion, selective, horizontal, surface-controlled, Q-CAJ
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Although drilling technology is now able to deliver ultra long horizontal wells (LHWs), completion technology has been slower to evolve. Running long liners, effective stimulation, and completions are some of the areas that require more attention. This paper discusses some of the challenges in the development of the Al Shaheen reservoirs offshore Qatar and how they were overcome. Some of these wells have a stepout in excess of 30,000 ft with a total vertical depth of 3,100 to 3,500 ft, and thus, they offer some unique challenges. Running and cementing liners to these depths is difficult, and some of the methods to achieve this effectively are discussed. Perforating guidelines are presented that allow sand control without having to resort to conventional sand-control practices. Stimulation of such long reservoir sections is a particular challenge, and a fine balance must be struck between acid coverage and cost, both for barefoot and perforated intervals. The so-called Q-CAJ technique of acid distribution, which has allowed acceptable stimulation despite these conditions, is presented. The technique also offers opportunities to stimulate long horizontal boreholes more effectively and at lower cost. Some of the wells are completed with multizone selective completions, which push the design limit of equipment. A number of such intelligent wells have been completed successfully, and more aggressive wells are planned. To optimize the development cost, dual-lateral wells have also been drilled with complete control over each lateral. Discussed are some of the underlying completion techniques such as running completion in stages, use of mechanical latches, hydraulic-control-line wet connects, interval control valves, and limitations imposed by control lines. The paper concludes with some of the challenges that have yet to be overcome.
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