摘要
井研-犍为构造位于川西南坳陷铁山-威远穹隆带构造西南部,陡坡寺、龙王庙、沧浪铺地层可钻性差,已钻8口井普遍存在钻井周期长、机械钻速低的问题。对难钻地层进行露头采集,进行岩石力学分析,认为前期对该地区地层抗钻特征认识不清楚、钻头选型针对性不强是导致机械钻速低的主要因素。针对目前该区块钻井提速面临的主要问题,定量评价了难钻地层的抗钻特征,提出了钻井提速优化技术方案:二开优选6刀翼聚晶金刚石复合片钻头配合大扭矩等壁厚螺杆,强化钻井参数,提升破岩效率;三开优选混合钻头,利用牙轮齿的冲击压入作用和聚晶金刚石复合片钻头齿的剪切作用,提升在难钻地层中的定向效率。通过实施上述方案,同JS103HF井相比,JS103-4HF井难钻地层平均机械钻速提高75%,三开钻井周期同比缩短50.6%,提速效果显著,对加快该区块的油气勘探开发进程具有重要意义。
The Jingyan-Qianwei structure is located in the southwestern part of the Tieshan-Weiyuan dome belt structure in the southwestern Sichuan Basin.The drillability of Douposi,Longwangmiao,and Canglangpu formations is relatively high,Eight wells have been drilled,and there is a common problem of long drilling cycles and low penetration rate.The outcrop collection was conducted on difficult drilling formation,and rock mechanics analysis was conducted on the outcrop.It is considered that the lack of a clear understanding of the drilling resistance characteristics of the formation in this area and the lack of a strong pertinence in the selection of drill bits are the main factors leading to the low rate of penetration(ROP).According to the main problems of drilling speed increase in this block,the anti-drilling characteristics of difficult drilling formation are evaluated quantitatively,and the technical scheme of drilling speed increase optimization is put forward,such as selectting 6 blade polycrystalline diamond compact bit with large torque and other wall thick screw,strengthening drilling parameters,improving rock breaking efficiency in the second hole.The preferred hybrid bit utilizes the impact of the cone teeth and the shear action of the polycrystalline diamond compact teeth to improve the directional efficiency in difficult formations in the third hole.According to the above scheme,JS 103-4 HF well improves the average ROP by 75%,and the drilling cycle is shortened by 50.6%compared with the same period last year.The acceleration effect is significant,which is of great significance to accelerate the process of oil and gas exploration and development in this block.
作者
王治国
严焱诚
黄河淳
罗成波
WANG Zhiguo;YAN Yancheng;HUANG Hechun;LUO Chengbo(Institute of Petroleum Engineering Technology,Sinopec Southwest Oil&Gas Brach Company,Deyang 618000,Sichuan,China)
出处
《科技和产业》
2024年第16期194-198,共5页
Science Technology and Industry
基金
中石化科技项目“井研-键为竹寺组页岩气开发工程技术研究与应用”(P24012)。
关键词
页岩气
机械钻速
难钻地层
钻头选型
shale gas
mechanical drilling speed
difficult to drill formations
drill bit selection
