卡塔尔杜汉油田DK-586井钻井技术

卡塔尔杜汉油田DK - 5 86井是胜利油田定向井公司在卡塔尔承钻的 1口水平井,完钻井深 36 83m,水平位移 185 2m,水平段长 16 31.6m,垂深 1943m,是目前卡塔尔陆上油田最长的水平井之一。该井地质情况复杂,地层软,倾角大并具有较多的硬夹层,钻井液漏失严重。施工中,全井段采用MWD随钻测量,三开和增斜段采用 1.2 5°弯壳体带扶正器加长马达,水平段采用 ?12 0mm(1.5°)马达。施工时,频繁混入高粘钻井液,以减少滑动钻进长度来减小扭矩。在钻井液漏失严重,只进不出,无法处理钻井液时,靠边泵清水边钻进。通过调整钻压钻进的方式来控制井斜,尽量采用转盘钻进,减少滑动钻进,使滑动进尺仅占总进尺的 3.6 2%

Drilling Technology in Well DK- 586 in Qatar

Well DK-586 is a horizontal well drilled by Shengli Company in Qatar, with its bottom depth at 3683m, a horizontal displacement of 1852m, and a vertical depth of 1943m. It lists as one of the longest horizontal wells on land Qatar, and its horizontal interval extends as long as 1631.6 m. The geological condition is very complex, e.g., soft formation, high dip angle, and hard layers, severe lost circulations are encountered. MWD tool is applied during directional drilling, while in the 3rd phrase and build up section, 1.25° bent housing extended motor is used, and ?120mm motor is used in the horizontal interval. To reduce torque and drag, highly viscous drilling fluid is frequently added in during drilling. Lost circulation is so tough that no returns come out, and drilling can be only continued by pumping water in the hole. Hole deviation is controlled by adjusting weight on bit. Rotary drilling is conducted most of the time, and slide drilling is cut down to only 3.62% of the total footage.