Horizontal Drilling, a New Production Method

Bosio, J.

doi:10.1071/aj87004

Cited by 2 publications

(1 citation statement)

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“…For a particular drain hole diameter, increasing length is detrimental to maximizing returns on investment at a certain point in regards to decreased productivity and hence production rate. Though, reservoir contact of a drain hole has been known to extend to 4000ft (Bosio et al, 1987). It has been shown also that optimum ratio of diameter to drain hole length should be considered during horizontal well planning in order to compensate for the frictional pressure drop (Fadairo et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Realistic Optimization of Well Length for Horizontal Drilling

Orodu¹,

Fadiaro²,

Enebeli³

2012

BJPG

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Evaluation of optimal drain-hole length for horizontal wells in the past, under the condition of pressure drop between the toe and heel of the well, has neglected some vital variables. These include drain hole diameter as a parameter in the objective function, diameter of vertical section for well deliverability consideration, and the composite pressure drop of the well as a system. The length was optimized based on net present value as the objective function (Case-1), flow rate (Case-2) and vertical well pressure drop with constant bottom-hole flowing pressure (Case-3). Optimizing drain-hole length requires more than adjusting variables that improve inflow performance to maximize return-on-investment. The optimization process demands the observation of spectrum of variables/events that are influenced by the dynamic nature of production as relates to fluid property and composite pressure of the entire well and reservoir system. A holistic approach, considering the inflow (entire horizontal section acting as oil inflow source) and vertical lift performance is paramount, focusing on flow resistivity in the drain hole.

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Section: Introductionmentioning

confidence: 99%

Realistic Optimization of Well Length for Horizontal Drilling

Orodu¹,

Fadiaro²,

Enebeli³

2012

BJPG

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Forces on Curved Tubulars Caused By Fluid Flow

Mitchell

1996

SPE Production &Amp; Facilities

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Summary This paper examines the effects of fluid pressures and flowing fluid momentum on curved tubing, casing, or drillpipe in a wellbore. Special cases, such as the "fictitious force" used in tubing buckling analysis, are developed and explained in terms of actual physical behavior. New problems, such as the effect of tubing eccentricity on fluid forces, are identified. Lateral forces developed in curved tubulars due to fluid pressure can be much higher than expected, with significant impact on friction drag loads. Introduction The effect of fluid pressure on buckling has long been known. The current understanding of the role of fluid forces can be traced to a paper by Klinkenberg. This paper resolved many of the questions about the effect of fluid pressures on the neutral point by examining a column immersed in liquid. In a written discussion of this paper, H.B. Woods expanded Klinkenberg's results by considering different internal and external pressures. In this analysis, he introduced many of the ideas later used by Lubinski in the analysis of tubing buckling. Lubinski presented tubing buckling equations based on a "fictitious" buckling force that included the effects of internal and external pressure, but was developed for fluids of constant density. Hammerlindl expanded Lubinski's formulas to tapered strings and multiple fluid interfaces. Other authors (e.g. Chesney and Garcia) recognized that the "fictitious" force could be expressed as: (1) where F, is the "fictitious" force (compression positive), Fa is the compressive axial force in the pipe, pi is the internal pressure, ri is the inside radius of the pipe, po is the external pressure, and ro is the outside radius of the pipe. However, the way in which fluid forces load the tubing has always been somewhat unclear. In particular, the "fictitious force" used as the buckling force in the tubing analysis has caused considerable confusion. In this analysis, the fluid forces are shown to generate lateral forces proportional to the curvature of the tubing. When this result is used in the buckling equations, the "fictitious force" is determined clearly. Furthermore, the extension of buckling analysis to deviated wells is developed. For example, fluid forces are developed in the build section of a deviated well that are not usually considered.

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Horizontal Drilling, a New Production Method

Cited by 2 publications

References 0 publications

Realistic Optimization of Well Length for Horizontal Drilling

Realistic Optimization of Well Length for Horizontal Drilling

Forces on Curved Tubulars Caused By Fluid Flow

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