摘要
苏里格气田下古马家沟组埋藏深度达3 400 m,该储层为碳酸盐岩地层,可钻性较差。纵向上刘家沟组易井漏,"双石层"易井塌,山西组、太原组、本溪组等存在大段煤层,复杂地质条件制约了钻井速度。针对钻井提速难点,着重从直井段防斜提速、PDC钻头优选与螺杆钻具匹配、定向段井眼轨迹控制与钻具组合优化、水平段地质导向与工程定向技术结合及复合盐聚磺钻井液体系等方面进行了技术攻关与现场试验,初步形成了适应该构造钻井提速技术模式。2014年,苏5-16-46AH井完钻井深4 600 m,水平段长801 m,将该构造最快钻井周期64.08 d缩短到43.85 d,机械钻速由6.32 m/h提高到8.77 m/h,增幅38.8%,实现了该构造水平井的安全快速钻井。
For the lower Paleozoic Majiagou Formation, Sulige gasfield, its burial depth reaches 3400 m. And this reservoir is composed of carbonate rock, resulting in a poor drillability. Longitudinally, Majiagou Formation and Double-Shi Formation(also Shiqianfeng and Shihezi formations) derived in the leakage and collapse during a drilling, respectively; massive coal seam can be found in Shanxi, Taiyuan, and Benxi formations; and complex geological conditions may strongly affect a drilling speed. So, we implemented some research and field experiments, especially anti deviation and drilling-speed increasing in vertical well section, PDC bit optimization matching with positive displacement motor, well trajectory control in horizontal well section and bottom-hole-assembly optimization, geo-steering in horizontal well section integrating with directional drilling, and compound salt polysulfonate drilling fluid. Finally, a new technological pattern to increase drilling speed, available for this structure, formed. After its application to Su 5- 16-46 AH well, the drilling depth and the horizontal- section length were 4600 m and 801 m, respectively; the drilling cycle decreased to 43.85 d from 64.08 d, and the ROP increased from 6.32 m/h to8.77 m/h, also a 38.8 percent of increasing rate. Consequently, a safe and fast drilling can be realized for some horizontal wells in this structure.
出处
《天然气技术与经济》
2015年第6期39-42,82-83,共4页
Natural Gas Technology and Economy
关键词
苏里格气田
马家沟组
水平井
井眼轨迹
煤层垮塌
Sulige gasfield
Majiagou Formation
horizontal well
well trajectory
coal seam collapse
