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Sand Control Copy

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    HH..PP.. WWeellll SSccrreeeenn  SSaanndd CCoonnttrrooll     2 CCOOMMPPAANN Y  Y   HH..PP.. WWeellll SSccrreeeenn is a one of Europe’s largest manufacturers in sand control products for the Oil & Gas and Water industry. Throughout our more than 20 year history, from which the first 8 years as Houston Well Screen, we became an independent organization offering a complete range of well screen products and slotting & perforating services. Our strength not only rests with our products and service, but with the skills of our people, the technical knowledge and our 20 years of experience in the field. We are recognized for our excellence in customer solutions, creativity, flexibility and no-nonsense mentality, coupled with short delivery times and competitive prices.  The manufacturing capabilities of our production plant in Holland enables us to respond quickly to any demand for any well in Europe, Russia, Africa and the Middle East. In 2002 H.P. Well Screen inaugurated a new 3000 square meter production facility with the latest technology of manufacturing equipment.    3 SSAANNDD CCOONNTTRROOLL SSOOLLUUTTIIOONN  Production reliability is essential in offshore and maximum productivity is important anywhere. The control of sand flow in unconsolidated formations can be one of the most critical problems in down-hole well completion.  The sand control technology has developed over the years involving chemical and mechanical solutions. Still the simplest and by far the most reliable and effective method of sand control is the use of sand-retention: SLOTTED LINERS &  WELL SCREENS   Nowadays an open hole completion with stand alone screens is a well balanced solution for highly deviated and horizontal wells where sand control has to be achieved without gravel packing. HH..PP.. WWeellll ssccrreeeenn is your partner providing a total range of sand-retention products starting from slotted liners to pre-packed screens. All products from HH..PP.. WWeellll SSccrreeeenn have precise slot openings .  They can be used directly in the formation as a stand alone screen, with any further assistance of gravel packs.  To choose the most suitable sand control product, the following factors need to be considered. Still, the most important single design factor of any sand retention product is the correct sizing of the slot opening in relation to the formation grain size. All our products will bring you:   A low risk of plugging. A high inflow area. The ability to produce fines allowing increased well productivity. A simple installation, similar as running liners. A mechanical robustness. Low total costs compared to wire mesh or expendable screen types and techniques where fluid pumping is involved.      4 WWEELLLL SSCCRREEEENN DDEESSIIGGNN AANNDD SSLLOOTT SSIIZZEE   The design objective for well screens is stoppage of sand infiltration without excessive reduction of flow capacity. In order to determine the proper gauge for well screens, as well as, the proper gravel pore space, the formation grain size must be known. WWiitthhoouutt GGrraavveell PPaacckk  In this situation the sand control is base on the bridging theory and slot openings must be sized in direct relationship to the formation sands. Sand bridges are formed across the slot opening when the slot opening is about 2 times the sand grain diameter, preventing further particle movement. If the size of the grains varies, retention of the larger particles causes smaller particles to bridge behind them. To achieve stable bridges the individual sand grains should bridge on, rather than in, the slot openings. In formations with relatively coarse-grained, high-permeability sands, controlling sand and maintaining the well’s productivity is successful when a certain amount of formation sand can be tolerated. In stand-alone screen completions without the use of back-surging or pump-in treatments, the finer particles are not effective removed from the sand-face of the near-wellbore sand mass. If these particles are retained on the screen/slotted liner, they can eventually plug it and reduce well productivity. However, if they flow through the screen or slotted liner and do not plug it or form a sand-plug in the well, the well will produce indefinitely despite the fact that sand production has not been completely eliminated. For sands with a broad size distribution, a generally accepted guideline for designing a screen is to specify a slot width that is 2 times as large as the 10 percentile grain diameter. This sizing allows the finer particles to be produced, resulting in a natural gravel pack formed from the larger sand grains. For more uniform sands, screen openings equal to the 10-15 percentile formation sand diameter should be used. For a good result for non-uniform fine sand, we can take the 40 percentile sand diameter analysis.  The recommended slot opening can be read off the horizontal scale. (The “10% diameter” is the sieve size through which 90%, by weight, of the total formation sample will pass)
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