兴古区块复杂深井钻井提速综合配套技术

ROP Improvement Technology of Complex Deep Well in Xinggu Block

兴古区块为辽河油田主力上产区块,近年来多采用大斜度井和水平井等复杂结构井进行开发。在该区块钻井施工中,面临上部大井眼段定向困难、深部地层机械钻速低、井下复杂情况频发等难题,开发进度受到严重影响。根据区块地质特性和各井段钻井难点,通过新型钻头与钻具组合及钻井参数优选,以及大井眼段提高造斜率技术措施、井身结构与井身轨迹优化、提速工具与远程技术支持等集成化应用,探索复杂深井钻井提速综合配套技术。该技术应用效果显著:解决了兴古区块上部疏松地层大井眼定向造斜率不足和携岩困难的问题;突破了中生界角砾岩、太古界混合花岗岩等PDC钻头传统使用“禁区”;全井平均机械钻速同比提高20%以上,平均事故复杂率同比降低40%,钻井周期大幅缩短。

Xinggu buried hill reservoir is a main oil production block in Liaohe oilfield.In recent years,the complex well like highly deviated well and horizontal well is used to explore this area.In the process of drilling in this block,many challenges occur,including the difficulty of directed drilling in the upper big hole,low ROP in the deep formation and frequent borehole problems,which heavily influences the exploitation progress.By the study and integration of new bit&BHA and drilling parameter optimization,big hole buildup rate enhancement technical measures,wellbore structure and wellbore trajectory optimization,ROP improvement tool and remote technical support system,a ROP improvement technology of complex deep well has been established.Large-scale application shows that the problem of inadequate build-up rate and poor hole cleaning in the upper soft formation big hole has been solved,and making a breakthrough of the traditional“forbidden zone”of PDC bit in the formation of Mesozoic Erathem brecciate and Archean Erathem migmatitic granite.The ROP of whole well is improved by over 20% and the average rate of borehole problems decreases by 40%.Drilling cycle is greatly shortened.