Comparative Study of Multistage Cemented Liner and Openhole System Completion Technologies in the Montney Resource Play
- Brad Wilson (Murphy Oil Company Ltd.) | David Lui (Murphy Oil Company Ltd.) | James Kim (Murphy Oil Company Ltd.) | Mike Kenyon (Packers Plus Energy Services) | Matt McCaffrey (Weatherford International)
- Document ID
- Society of Petroleum Engineers
- Canadian Unconventional Resources Conference, 15-17 November, Calgary, Alberta, Canada
- Publication Date
- Document Type
- Conference Paper
- 2011. Society of Petroleum Engineers
- 2.2.2 Perforating, 4.1.5 Processing Equipment, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 5.8.2 Shale Gas, 4.1.2 Separation and Treating, 2.4.3 Sand/Solids Control, 5.7.1 Estimates of resource in place, 5.8.1 Tight Gas, 2.5.2 Fracturing Materials (Fluids, Proppant), 1.2.3 Rock properties, 2.5.4 Multistage Fracturing, 4.3.4 Scale, 4.6 Natural Gas, 1.6 Drilling Operations, 1.14 Casing and Cementing
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The Montney Formation Resource Play, which straddles the border between the Canadian provinces of British Columbia and Alberta, is considered by many to be one of the largest natural gas resource plays in North America. Original gas-in-place estimates for the Montney range from a minimum of 80 tcf to as high as 700 tcf. Despite horizontal, multistage stimulation being common practice to effectively exploit tight gas sand and shale reservoirs, determination of the optimal methodology and identification of the parameters that affect optimization have yet to be fully understood.
This paper compares two different multistage hydraulic fracturing technologies applied in the Lower Montney Formation: cemented liner and openhole multistage system (OHMS) completions. In-depth analysis was performed on field data from 15 wells divided into two separate geographical areas within the same field. Comparisons included production analysis, lateral lengths, number of stages, stage spacing, proppant volumes, and pump rates. Additionally, operational time and cost comparisons on a per well and per stage basis for both technologies were determined.
Based upon the field data analyzed, the application of OHMS completion technology is appropriate for the Lower Montney in the region of the play studied. Application of this technology for the wells selected in the two study areas resulted in both greater initial production rates and overall cumulative production than cemented liner completed wells. Additionally, less time was required to perform the fracture stimulation job when using OHMS technology as compared to cemented liners. Both the average total cost of completion and average cost per stage in conducting cemented liner jobs was higher than employing OHMS completions.
The following document compares two different completion technologies employed by a major oil and gas operator in a tight gas field southeast of Dawson Creek, British Columbia in the Montney siltstone resource play. These two completion technologies are the traditional cemented liner completion (both "plug and perf?? and coiled tubing sand-jet technologies) and the more recently introduced openhole multistage fracturing system (OHMS). Specifically, this document studies the lower section of the Montney Formation.
Formation Description. The Montney Formation is a Triassic-age siltstone trending southeast from NE British Columbia to NW Alberta. This formation generally consists of both siltstones and dark grey shales. While the Upper Montney is characterized by light brown siltstones interlaminated with fine grained sands, the Lower Montney (the subject of this study) is a dark grey, dolomitic siltstone with interbedded shales (Glass et al., 1997).
Within the area of study, the Montney ranges in thickness from 240 m to 285 m. The Lower Montney wells evaluated were horizontally placed between 2,665 m and 2,804 m true vertical depth (TVD). It has been estimated that the Montney may hold between 80 and 700 tcf or 2.3 - 19.8 trillion cubic meters of gas in reserves National Energy Board, Canada, 2009).
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