哥伦比亚Matambo区块深井钻井关键技术

Key Techniques for Deep Well Drilling Optimization in the Block Matambo,Colombia

哥伦比亚Matambo区块油藏埋深约5 000.00m,具有地层倾角大、多套压力系统、地应力高、多断层破碎带、多层大段泥岩、巨厚砾石层及异常高压地层等特点,6口深井在钻井过程中频繁发生井塌、阻卡和井漏等井下故障,导致钻井速度慢、钻井周期长。为提高该区块油气勘探开发效益,在充分分析该区块地质情况和总结已完钻井施工经验的基础上,从井身结构优化、井眼轨道设计与轨迹控制、多参数随钻监测与分析、固井工艺优化及钻井液体系优选等方面进行了技术攻关,形成了适合该区块的深井钻井关键技术,并在G10ST5井进行了现场试验。G105ST5井顺利钻至设计井深,井身质量和固井质量满足设计要求,与该区块其他6口深井相比,钻井周期缩短了20.7d,平均机械钻速由3.00m/h提高到7.00m/h,井下故障损失时间在钻井周期中的占比由原来的15%~30%降至7%,钻井综合成本降低近45%。现场试验结果表明,Matambo区块深井钻井关键技术能够满足深井钻井提速提效的要求,也为其他类似区块复杂深井的优快钻井提供了技术借鉴。

The formation depth of the Block Matambo in Columbia is around 5 000.00 m.Situated in mountainous terrain,it has complex surface conditions with a large dip angle,multiple pressure systems,high in-situ stresses,frequent fault and fracture zones,multiple thick mudstone formations,massive gravel formations and abnormally high-pressure formations.Downhole problems like well collapse,drill pipe sticking,and circulation lost were frequently encountered in the drilling process in six well drillings resulting in slow drilling rate and long drilling cycle.In order to improve the oil and gas exploration and development benefits in this block,we conducted technical research from the aspects of casing program optimization,wellbore trajectory design and control,multi-parameter monitoring and analyzing while drilling,cementing technique optimization,drilling fluid system optimization,etc.by fully analyzing the geological conditions of this block and summarizing the experiences of previously drilled wells Based on the research,we developed key techniques in deep well drilling suitable for this block.Field tests have been conducted in the Well G10 ST5 and it was drilled to the designed depth smoothly with wellbore quality and cementing quality up to design requirement.Compared with other six deep wells drilled within this block,the drilling cycle was reduced by 20.7 days and average ROP was increased from 3.00 m/h to 7.00 m/h,and loss time from downhole failure decreased from the original 15%-30% to 7%,and the comprehensive drilling cost was reduced by nearly 45%.The results of field tests illustrated that those key techniques in deep well drilling in the Block Matambo could meet the requirement of enhancing speed and efficiency in deep well drilling,and also provide a good analogy and reference points in the rapid drilling of complicated deep wells in similar formations.