Optimization of horizontal well-completion design with cased/perforated or slotted liner completions

Kenji Furui, Ding Zhu, A. D. Hill, Eric R. Davis, Brian R. Buck

研究成果: Article

10 引用 (Scopus)

抄録

A well completion is a critical interface between the productive formation and the wellbore. An effective completion must maintain the mechanical integrity of the borehole without creating any significant restrictions on the flow capacity of the well. In this paper, a process is outlined to design optimal completions for horizontal wells by applying comprehensive skin-factor models that include damage and turbulence effects for all common types of completions. Slotted or perforated liner, cased, perforated, or gravel-pack completions have been used in horizontal wells for borehole stability and sand-control purposes. However, these completions may have lower productivity (as characterized by a positive skin) relative to an equivalent openhole completion, because the convergent flow to perforations or slots increases fluid velocity in the near-well vicinity. In addition, any reduced permeability zones (formation damage caused by drilling, completion, or other processes) magnify the convergent flow effects and therefore may result in substantially increased skin factors. Compound effects of formation damage around the well completion, a crushed zone because of perforating, plugging of slots, and turbulent flow, as well as interactions among these effects, are included in the model. This paper illustrates how to use skin factor models to screen the available completion types for cased/perforated and slotted liner completions. This screening approach considers reservoir permeability, permeability anisotropy, fluid properties, formation damage effects, and rock mechanical characteristics as the key parameters. The types of completion that yield the most productive well performance for this matrix of properties are presented. A more detailed completion design is then illustrated by showing how the skin-factor models were used to redesign the slot configuration of liner completions for viscous oil reservoirs on the North Slope of Alaska. Application of the slotted or perforated liner models to the readily available liners showed that the completion skin factor can vary by as much as 40%, depending on the detailed characteristics of the slots or perforations in the liner (slot or perforation size, density, and distribution). The example showed that optimizing the performance of the completion can increase well productivity at little or no cost and with no loss in liner mechanical strength.

元の言語English
ページ(範囲)248-253
ページ数6
ジャーナルSPE Production and Operations
22
発行部数2
出版物ステータスPublished - 2007 5
外部発表Yes

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Well completion
Horizontal wells
Skin
Boreholes
Productivity
Flow interactions
Perforating
Fluids
Gravel
Turbulent flow
Strength of materials
Drilling
Screening
Anisotropy
Turbulence
Sand
Rocks
Costs

ASJC Scopus subject areas

  • Energy Engineering and Power Technology

これを引用

Optimization of horizontal well-completion design with cased/perforated or slotted liner completions. / Furui, Kenji; Zhu, Ding; Hill, A. D.; Davis, Eric R.; Buck, Brian R.

:: SPE Production and Operations, 巻 22, 番号 2, 05.2007, p. 248-253.

研究成果: Article

Furui, Kenji ; Zhu, Ding ; Hill, A. D. ; Davis, Eric R. ; Buck, Brian R. / Optimization of horizontal well-completion design with cased/perforated or slotted liner completions. :: SPE Production and Operations. 2007 ; 巻 22, 番号 2. pp. 248-253.
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