Developing a Stage Tool for Cemented Back Monobore Completions with Open Hole Multi-Stage Systems in the Montney
- Kyle Patrick Kimmitt (Packers Plus)
- Document ID
- International Petroleum Technology Conference
- International Petroleum Technology Conference, 15-17 November, Bangkok, Thailand
- Publication Date
- Document Type
- Conference Paper
- 2011. International Petroleum Technology Conference
- 4.1.5 Processing Equipment, 3 Production and Well Operations, 1.2.1 Wellbore integrity, 1.6.6 Directional Drilling, 1.10 Drilling Equipment, 5.8.2 Shale Gas, 5.8.1 Tight Gas, 2.5.4 Multistage Fracturing, 1.6 Drilling Operations, 1.11 Drilling Fluids and Materials, 2.2.2 Perforating, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 2 Well Completion, 4.1.2 Separation and Treating, 1.14 Casing and Cementing, 2.4.3 Sand/Solids Control
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Challenges associated with cementing horizontal wellbores, as well as the higher operational time and costs associated with the cemented liner, plug and perf method, has resulted in many operators switching to open hole multi-stage system (OHMS) completions. In addition, production increases have been realized with OHMS due to access to the entire open hole lateral.
To further optimize economics, cemented back monobore completions with OHMS are becoming the completion method of choice for operators. This is because they save on wellbore costs by eliminating the intermediate casing. Instead, the build section of the wellbore is cemented back to surface using a stage tool once the liner is installed. In addition, the cemented back method allows for OHMS systems to be run in on liner eliminating the need to trip out the running string and trip in the frac string.
This paper outlines the operational procedure for cemented back monobore OHMS completions. Due to various issues with conventional plug-type cementing stage tools a new hydraulically activated, mechanically closed cementing stage collar was designed to open/close without the use of a plug/dart. The new stage tool addresses the operational issues encountered with conventional tools and further reduces costs by reducing rig time. With the new stage collar, there is no drill out of plugs and cement after the cementing operation, eliminating debris that could be problematic for the OHMS functioning.
The development of the new stage collar through lab testing and field trials is discussed. This technology has been successfully used in various formations in
Canada and the United States. This paper presents case study examples of installations in the Montney formation.
Geology of the Montney. The Montney formation covers an area of approximately 246,000 km2 (95,000 sq. mi.) stretching across Alberta and British Columbia (Figure 1). It is a leading example of an unconventional gas play in the Western Canadian Sedimentary Basin containing vast quantities of proven gas reserves. Estimates of gas in place are up to 700 Tcf.
The Montney consists of four distinct intervals: the Upper, Middle, Middle Lower and Lower (National Energy Board, Canada). Characterized by its low permeability (0.01 - 0.5 mD) and thick stack, the Montney is a prime candidate for horizontal drilling and hydraulic fracturing techniques. The formation is a blend of sandstone, siltstone and shale intervals with porosity up to 8% and true vertical depth to 3,950 m (13,000 ft).
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