7. Sand Control Methods

7. SAND CONTROL METHODS

TUNIO, May' 2011,,, Courtesy AP Aung

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LESSON LES SON OUT OUTCOME COMES S

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At the end of this section, the students will be able to :

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.

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Identify Iden tify sand contro controll mechanisms. mechanisms.

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Apply mechanical and chemical methods.









INTRODUCTION

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Sand production is one of the oldest problems of the oil fiel fi eld, d, us usua uall lly y as asso soci ciat ated ed wi with th sh shal allo low w form ormat atio ions ns,, bu butt in some so me ar area ea sa sand nd rob oble lems ms ma be en enccou oun nte terred to de th thss of 12,000 feet or more.









SAND CONTROL MECHANISMS

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Causes of sand production are related –

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Drag forces of flowing fluid Reductio Reduc tion n in for orma matio tion n st stre reng nght ht of ofte ten n as asso socia ciate ted d wi with th wa wate terr production due to dissolving or dispersion of cementing materials









SAND CONTROL MECHANISMS

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Sand production can be controlled by three mechanisms: Cheapestt and most effe effective. ctive. It often often is 1. Reduc Reducing ing Dr Drag ag Fo Forc rces es – Cheapes the natural outcome of proper well completion practices. .

r g ng an

ec an ca y –

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Wide application

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Difficult to apply in multiple zones or small diameter casing.









MECHANICAL SAND CONTROL DESIGN CRITERIA •

Mechanical methods of sand control involve use of –

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Gravel to hold formation sand in place (with a screen to retain the gravel) A screen to retain the fromation sand (with no gravel).

Basic problem is how to control formation sand without an excessive ex cessive reduction in well productivity productivity.. Basiic design parameters include:











Formation Sand Size Analysis









Formation Sand Size Analysis

US mesh size

Approximate diameter









Screen Slot Size and Gravel Size









Screen Slot Size and Gravel Size

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The following rules-of-thumbs are suggested: 1. Us as lar

el as

ible, ibl e, but f

tio

nd must must be









GRAVEL PACKING









































7. Sand Control Methods

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