Produced sand causes a lot of problems. From that reasons sand
production must be monitored and kept within acceptable limits.
Sand control problems in wells result from improper completion
techniques or changes in reservoir properties. The idea is to
provide support to the formation to prevent movement under stresses
resulting from fluid flow from reservoir to well bore. That means
that sand control often result with reduced well production.
Control of sand production is achieved by: reducing drag forces
(the cheapest and most effective method), mechanical sand bridging
(screens, gravel packs) and increasing of formation strength
(chemical consolidation). For open hole completions or with
un-cemented slotted liners/screens sand failure will occur and must
be predicted. Main problem is plugging. To combat well failures due
to plugging and sand breakthrough Water-Packing or Shunt-Packing
are used.
General
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