发明名称 |
ONE TRIP DRILL AND CASING SCRAPE METHOD AND APPARATUS |
摘要 |
<p>A drilling assembly is tripped in a cased hole to make more open hole. The assembly features retracted scrapers and a closed circulation sub so that the drilling can commence with string pressure delivered to bit nozzles due to the circulation sub being in a closed position. When drilling is done and the bit is to be removed, an object lands on a seat on a sleeve that acts as a piston to break scraper retainers for casing scraping deployment and to open the circulation port. A bypass opens around the seated ball when the sleeve shifts to allow flow around the seated ball for circulation while scraping. Drilling and casing scraping are accomplished in a single trip.</p> |
申请公布号 |
CA2916480(A1) |
申请公布日期 |
2015.01.29 |
申请号 |
CA20142916480 |
申请日期 |
2014.06.26 |
申请人 |
BAKER HUGHES INCORPORATED |
发明人 |
HERN, GREGORY L.;XU, YANG |
分类号 |
E21B37/02;E21B21/00 |
主分类号 |
E21B37/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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