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MarlimSul油田位于巴西东南端的冈波斯盆地 ,是这个国家最大的油田之一。该区域水深 10 0 0 190 0m ,用水平井开发 ,潜在产量达 5 0 0 0m3/d。由于松散砂岩的存在 ,需强制控砂 ,并且用裸眼井砾石充填法来避免产砂。规定的套管程序是由 30in导管、 13 in的表层套管、 9 in的生产套管和在 8 in水平井段用砾石充填的 5 in的带中心管的筛管组成。新井设计应用了新技术 ,如旋转导向钻具、可膨胀筛管和合成油基钻井液和完井液 ,节省了表层套管。新设计使用了 30in导管、 10 in生产套管和8 in井眼用的 7in套管和 5 in可膨胀筛管的组合。 7in套管和可膨胀筛管一起下入井内。筛管膨胀后 ,注水泥工作就通过一个分级接箍来实现以便于隔离产油层以上的地层。除了总钻井成本降低外 ,油井的生产率也得到提高。模拟显示 ,与 5 in筛管比较 ,通过应用可膨胀筛管能获得较大的井眼内径 ,提高了生产指数并且在水平井段建立了一个较好的生产布局 ,因此 ,就像所预料的那样 ,水的产出滞后了[1] 。本文集中讨论了新井设计标准和用于新井建设的操作程序。
The Marimsul field is located in the Gampos Basin on the southeastern tip of Brazil and is one of the largest in the country. The water depth of this area is 10 0 190 190 m, developed with horizontal wells with a potential output of 5 0 0 0 m3 / d. Due to the presence of loose sandstone, sand control is forced, and open-hole gravel packing is used to avoid sand production. The specified casing procedure consisted of a 30 in. Conduit, a 13 in. Casing, a 9 in production casing and a 5 in. Center tube screen gravel packed in an 8 in horizontal well section. New wells are designed with new technologies such as rotary pilots, expandable screens, and synthetic oil-based drilling fluids and completion fluids, saving surface casing. The new design uses a combination of a 30in catheter, a 10in production cannula and a 7in cannula for an 8in borehole and a 5in expandable screen. 7in casing and expandable screen into the well together. After the screen is expanded, the cementing work is done by a tiered collar to isolate the formation above the pay zone. In addition to reducing total drilling costs, well productivity has also been improved. Simulations have shown that, compared to 5 in screens, larger borehole diameters can be obtained by using expandable screens, the production index is increased, and a better production layout is established at the horizontal section, so it is as expected That way, the output of water lags [1]. This article focuses on the new well design standards and the operating procedures for new well construction.