浅层水平井井眼轨迹控制技术

克拉玛依油田九8区齐古组稠油油藏底部构造形态为一由西北向东南缓倾的单斜,地层倾角3°~9°,油层渗透率高,埋深仅200m,用直井开发单井产量低。钻了4口浅层水平井,井身剖面为斜直-增-稳(水平段)型,斜井深493~538m,垂深170.60~179.80m,水平位移403.50~477.80m,水平段长201.08~233.30m,斜深与垂深比2.82~2.99,平均单井产量比直井提高3倍多。文中介绍了浅层水平井的剖面设计、井眼轨迹控制、钻具结构等。

WELL TRAJECTORY CONTROL TECHNOLOGY FOR SHALLOW HORIZONTAL WELL

The structural configuration at the bottom of viscous oil reservoir in Kelamayi oilfield was a low-angle monocline from northwest to southeast. The dip was 3~9°, itwas of a high permeability and the buried depth was only 200m. So the viscous oil reservoir was developed by vertical wells with a low individual-well producing rate. Four shallow horizontal wells were drilled with slant-angle building-angle holding(horizontal section) type. The depth of slant hole was 493~538m. The vertical depth was 170.60~179. 80m.The horizontal displacement was 403. 50~477. 80m. The length of horizontal section was 201. 08~233. 30m. The ratio of deviated depth and vertical depth was 2. 82~2. 99 and the average individual-well producing rate was four times more than that of vertical wells. This paper introduced the section design, well trajectory control, drlll stem structure of shallow horizontal well and so on.