四川鼎恒石油訊   當(dāng)在海底鉆井達(dá)到總深度時(shí)，對(duì)壓力和操作者的要求不斷增加，因此標(biāo)準(zhǔn)的API鉆桿和旋轉(zhuǎn)式連接不再適合這種操作。創(chuàng)建完成管件是為了解決這個(gè)問題，但直到近，才開發(fā)出一種具有專門連接技術(shù)的大型完井著陸管柱(CLS)，以與當(dāng)前部署在超深水位鉆機(jī)上的水平海底井口的大型栓塞兼容。

CLS是NOV使用7寸管道和MaXit™發(fā)展而來，是一種內(nèi)置的氣密，大流量，壓力額定的旋轉(zhuǎn)式連接技術(shù)。CLS經(jīng)歷了緊張的研究和開發(fā)階段，確定了壓力等級(jí)，大化上扣扭矩，工具接頭外徑以及小通徑。隨后，制定了嚴(yán)格的測(cè)試階段計(jì)劃;實(shí)施了有限元分析，驗(yàn)證了連接中的應(yīng)力分布和全面物理測(cè)試，以驗(yàn)證連接性能。 后，在超深水鉆機(jī)上進(jìn)行了7寸CLS的油田測(cè)試和限制證明，以確保配有鉆井船管道處理和運(yùn)行設(shè)備的新型大尺寸管道的兼容性，并在實(shí)際油田現(xiàn)場(chǎng)條件下驗(yàn)證連接的性能。

7寸CLS現(xiàn)已在墨西哥灣完成四個(gè)部署，鉆機(jī)平臺(tái)人員使用CLS確認(rèn)新管柱比以前的套管著陸管柱更快，更安全。新的管柱讓運(yùn)營(yíng)商省去了使用套管，管道運(yùn)行服務(wù)和相關(guān)設(shè)備的成本，并將每次連接的時(shí)間縮短至少4分鐘，與之前的優(yōu)質(zhì)套管連接著陸柱相比，運(yùn)行時(shí)間節(jié)省了3.5到10個(gè)小時(shí)。

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注：該文章由鼎恒石油編譯，轉(zhuǎn)發(fā)須注明出處。

附英文原文：

NOV’s large-diameter completion landing string featured in August World Oil

When drilling to total depth in subsea wells, pressures and operator’s requirements have continued to increase, making standard API drill pipe and rotary-shouldered connections unsuited to such operations. Completion tubulars were created to address the issue, but it was not until recently that a large-sized completion landing string (CLS) with a specialized connection technology was developed to be compatible with the large crown plugs of horizontal subsea well heads currently deployed on ultra deepwater rigs.

The CLS was developed by NOV using 7-in. pipe and MaXit™, which is a built-for-purpose, gas-tight, large-drift, pressure-rated, rotary-shouldered connection technology. The CLS underwent an intense research and development phase, where pressure ratings, maximum makeup torque and tool joint OD, and minimum drift diameter were established. Following this, a rigorous testing phase plan was created; both finite element analyses, to verify stress distribution in the connection, and full-scale physical testing, to verify connection performance, were conducted. Finally, a field trial and qualification of the 7-in. CLS tubular were conducted onboard an ultradeepwater drillship to assure compatibility of the new, larger-sized tubular with the drillship’s pipe handling and running equipment and validate the connection’s performance under actual field conditions.

The 7-in. CLS has now been deployed on four completion in the Gulf of Mexico, with rig crews using the CLS confirming that the new string ran quicker and safer than the previous casing landing string. The new string allowed the operator to avoid the costs of using casing, tubular running services, and related equipment, and reduced the connection time by a minimum of 4 min. per connection, slip to slip, in comparison to the previous premium casing connection landing string, yielding time savings of 3.5 to 10 hours running the completion.