The construction of P202-2H well is hard due to long horizontal hole section and large string friction. High safety coefficient for strings in construction is required.

2H井施工难度大：水平井段长，管柱摩阻大，对施工管柱要求安全系数高；

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In view of long hole section, milt-point, disconnected channels of Xing 1~3 block in Daqing oilfield, proposed countermeasure for detect and treatment channels outside tube.

针对大庆油田杏1~3区乙块三次加密试验区大段、多点、不连续窜槽井问题，提出了相应的管外窜槽检测及治理对策。

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The DH4-8 well, located at Donghetang Oilfield in Tarim Basin, Xinjiang, is a directional production well with the deepest open hole sidetrack point and the longest open hole section.

位于新疆塔里木东河塘油田的DH 4- 8井是目前国内裸眼侧钻点最深、裸眼井段最长的定向开发井。

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The technique means only two or three tiny key-hole incisions are made in the cornea, with the unhealthy section removed using special instruments and the donor cornea inserted through the opening.

BBC: New eye surgery shortens recovery

Section 1504 presents the classic problem of trying to fit a square peg into a round hole.

FORBES: Oil and Gas Payment Disclosure May Harm Investors