A Simplified Pseudo 3D Model To Evaluate Sand Production Risk in Deviated Cased Holes

Kessler, Nicolas; Wang, Yarlong; Santarelli, F.J.

doi:10.2523/26541-ms

Cited by 5 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Calculation of the distribution of stresses around a cased borehole subjected to in situ stress is important for perforation sanding analysis, 1–3 casing deformation study, 4,5 cement integrity evaluation, 6,7 and cased hole log interpretation 8,9 . In an open borehole, the distribution of stresses around the wellbore is affected by well trajectory, in situ stresses, borehole fluid pressure, and rock properties 10 .…”

Section: Introductionmentioning

confidence: 99%

“…Although this method does not simulate exactly the formation elasticity anisotropy, it can be considered as a simplified approximation of a cased borehole in a transversely isotropic formation with the borehole axis parallel to the isotropy plane of the formation. Besides these analytical studies, a number of researchers 1,3,5,30 have conducted cased borehole stress analyses using numerical modeling methods, such as finite element method and finite volume method. Other numerical modeling approaches 31–35 applicable to anisotropic material can also be applied to the study of the cased borehole problem.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An analytical approach for cased borehole stress calculation in general anisotropic formations

Wang

Fang

Zhang

et al. 2020

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

We present an explicit analytical approach for calculating the distribution of stress around a circular cased borehole in a general anisotropic formation. This approach is developed based on a pure elastic cased borehole model, which can include multiple cemented concentric casing strings that are surrounded by a homogeneous anisotropic medium. The wall of the innermost casing is under the compression of borehole internal fluid pressure, and the formation can be subjected to arbitrary far-field stresses. Every casing-cement boundary is assumed to be welded, so as the cement-formation boundary. The derived analytical solution can be applied to an arbitrary wellbore trajectory in an arbitrary anisotropic formation and is also applicable to degenerate isotropic formations. Accuracy and robustness of the analytical solution is validated through comparing its results with those calculated from the classical Kirsch solution for an isotropic example that has identical elastic properties for all materials and from a finite element method for an anisotropic cased borehole example.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An analytical approach for cased borehole stress calculation in general anisotropic formations

Wang

Fang

Zhang

et al. 2020

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

Practical Approach To Achieve Accuracy In Sanding Prediction

Qiu

Marsden

Alexander

et al. 2006

SPE Asia Pacific Oil &Amp; Gas Conference and Exhibition

View full text Add to dashboard Cite

This paper was also presented as SPE 100948 at the 2006 SPE International Oil & Gas Conference and Exhibition in China held in Beijing, 5–7 December 2006. Abstract Sand production is a major concern for many operators. It can impact production, cause erosion in downhole and surface facilities, require additional separation and disposal, and lead to significant economic loss. On the other hand, precautionary but unnecessary sand prevention will mean unwarranted reduction in productivity. Reliable sanding prediction analysis thus provides a basis for designs that achieve appropriate sand management strategies and maximization of economic production, and overestimates or underestimates of sanding risk increase the chances of serious economical loss. This raises the question of how accurate and reliable sanding predictions might be achieved without overcomplicating the analyses and without requiring complex lab and field data that, in most instances, will be unavailable or the acquisition of which will incur unwanted delays and costs. This paper presents the case of a sanding study for the Messla field in Libya; a field that has produced oil for more than 30 years. This field experiences massive sanding from some wells but experiences no problems with other wells. This variation made the Messla field an ideal candidate for a detailed sanding and geomechanics investigation aimed at optimizing completions and production and at dramatically reducing the current sanding without having to enter into a lengthy data acquisition programme or time-consuming modelling. In this study, sanding prediction analyses were conducted using a technique that combines easily measurable lab data, log data, and analytical calculations with empirical methods that are supported by the results from previously run rigorous and advanced numerical code. The result of this integration is a sanding analyses tool that uses input parameters such as rock strength, geostresses, and particle size to:account for plasticity effects that modify the strength behaviour of sands surrounding openhole wells and perforations during drawdown to reduce uncertainty and conservatism such as seen in simple elastic models,account for scale effects associated with different perforation and borehole diameters,provide a significant improvement and predictive capability over simple empirical methods,provide the above accuracies without needing complex or extensive lab programmes to determine advanced rock mechanics properties. The application of this approach to the Messla field and a later comparison of the results to actual field data and observations validated the analyses and methods used. The application and comparison also disclosed that the approach was not only able to provide results that closely matched field experience but was also able to predict correctly, to the year, the onset of sanding in wells. This paper describes the methods employed in this investigation, provides details of the data acquisition and processing required, and demonstrates that accurate sanding predictions can be achieved by focusing effort on certain input data, targeting and reducing specific uncertainties, and by employing pragmatic models that do not rely on over-complicated measurements and analyses. Introduction The giant Messla field is located in the southeast portion of Sirte Basin in Libya, approximately 500 km southeast from Benghazi (see Figure 1). The field, operated by AGOCO, has been producing for over 30 years, and since the mid-1980s some wells have suffered massive sanding while others have not. 1 A geomechanics and sanding study was initiated in 2005 to investigate the reason for this variation, to evaluate the severity of sanding risk in other wells, and to provide the information and interpretations needed to design appropriate completions, maximize economical production and optimize future reservoir management.

show abstract

Sand Production in Ultra-Weak Sandstones: Is Sand Control Absolutely Necessary?

Tronvoll¹,

Papamichos²,

Skjaerstein³

et al. 1997

Latin American and Caribbean Petroleum Engineering Conference

View full text Add to dashboard Cite

TX 75083-3836, U.S.A" fax 01·972·952·9435. AbstractThis study is focusing on sand production processes in weak sandstone formations with a uniaxial compressive strength in the range of 0 -10 MPa, with special emphasis on the ultraweak facies where uniaxial compression tests hardly can be conducted. The relative influence of rock mechanical properties on rock failure and sand production modes is addressed to understand sand production data from wells in a weakly consolidated basin, Results of physical model experiments of sand production from boreholes and perforation cavities as well as numerical simulations have been used along with the field data to evaluate different criteria for the onset of sand production in ultra-weak formations. It is shown how in particular the shallow and weakest strata deviates from the classical behavior of more competent formations, and a simple empirical criterion for estimation of the conditions for onset of sand production is proposed, Finally, alternatives to classical sand control strategies are discussed, which directly take into account the nature of weak sandstone,

show abstract

A Simplified Pseudo 3D Model To Evaluate Sand Production Risk in Deviated Cased Holes

Cited by 5 publications

References 0 publications

An analytical approach for cased borehole stress calculation in general anisotropic formations

An analytical approach for cased borehole stress calculation in general anisotropic formations

Practical Approach To Achieve Accuracy In Sanding Prediction

Sand Production in Ultra-Weak Sandstones: Is Sand Control Absolutely Necessary?

Contact Info

Product

Resources

About