福州花岗岩区大直径地热深井主要钻井技术     

田勇 《福建地质》2011,30(2):177-182

在福州大直径地热深井钻探施工中,使用钻井能力大于600m的大型水文钻机及相关配套设备,选用HA、HJ系列掌背强化金刚石保径、中-高抗压强度镶齿三牙轮钻头,采用 气举反循环钻井工艺,成功施工十余口550～1 200m优质高温大口径地热深井,介绍了其主要钻井技术,对今后深层回灌钻井施工具积极的作用.  相似文献   

Effect of Agents on Hydrate Formation and Low-Temperature Rheology of Polyalcohol Drilling Fluid     

蒋国盛  宁伏龙  张凌  涂运中 《中国地质大学学报(英文版)》2011,(5)

In order to ensure safe drilling in deep water and marine gas hydrate bearing sediments,the needed characteristics of drilling fluid system were analyzed.Moreover,the effect of different agents on hydrate formation and the low-temperature rheology of designed polyalcohol drilling fluid were tested,respectively.The results show that clay can promote gas hydrate growth,while modified starch and polyalcohol can inhibit hydrate formation to some extent,and PVP K90 has a good performance on hydrate inhibition.Th...  相似文献   

千斤顶在钻井事故处理中的应用     

刘炳志  王英 《中国煤炭地质》2011,(6):69-70,74

山西三交煤层气区块某煤层气参数井＋生产试验井施工中遇到的一次钻杆折断,孔底遗留钻具为78.38m的孔内事故。在事故分析和施工经验总结的基础上,为弥补钻探设备对孔内钻具提升力的不足,尝试将千斤顶应用到事故处理中,并成功地处理了这次由于断钻具引起的卡、埋钻事故,避免了处理事故过程中次生事故的发生,减少了处理事故的时间,保证了施工工期和钻孔质量,大大减少了由于孔内事故引起的经济损失,取得了良好的经济效益和社会效益。  相似文献   

低土相高密度钻井液体系的配方研制     

梁文利  刘杰  吴易成 《海洋地质译丛》2011,(3):81-88

针对高密度钻井液体系普遍存在的黏度偏大、流变性难以调控、经常出现井下复杂情况等问题,通过对聚合物包被剂、膨润土含量、润滑剂、抑制剂的优选,确定了低土相高密度钻井液体系的最佳配方,开发了一套低土相高密度钻井液体系。室内研究结果表明,该钻井液体系具有良好的抗钻屑、NaCl和石膏的污染能力和良好的抑制封堵能力,岩屑滚动回收率达到93．7％,能够满足高温高压、严重造浆、高渗透率以及微裂缝发育等复杂地层的钻井技术要求。  相似文献   

小井眼侧钻水平井钻完井工艺在QHD32—6油田的应用     

金鑫  张飞  王占领  苏建  李艳飞  白维昊  那宇 《海洋地质译丛》2011,(3):89-92

由于海洋石油开发的特殊性,每个采油平台的槽口数量有限,而新建平台或者外挂槽口成本太高,因此利用低效井和关停井的槽口进行套管内开窗侧钻成为一种很好的选择。QHD32—6F平台部分生产井为中177．8mm生产套管,利用修井机在Ф177．8mm生产套管内开窗侧钻Ф152．4mm小井眼,直接着陆钻水平段,裸眼段最长达1120m,平均长1032m。该工艺技术可操作性较强,工期短,成本低,为延长老油田寿命,维持老油田经济开发指明了方向。  相似文献   

金刚石钻探促进了我局钻探工程的飞跃发展──为吉林省地矿局推广小口径金刚石钻探20周年而作     

陈耀宗 《吉林地质》1994,(4)

吉林省地矿局自１９７４年推广小口径金刚石钻探以来，钻探效率大幅度提高，加强金刚石多工艺钻探技术，使全局钻探水平跃居地矿系统的前列，加快了吉林省地质找矿的速度。金刚石钻探技术成为我省黑色、有色、贵金属、非金属矿床的重要勘探手段。  相似文献   

Research on experiment and calculation of foam bursting device     

References： 《东北亚地学研究》2007,10(1):34-38

This research presents experimental data on mechanical foam bursting device,based on the high speed of air fluid impinging insidethe foam bursting device,foam bubbles disrupted as a consequence of pressures changed very quickly as shear force and their impact forces.Experimental data on foam-bursting capacity have been presented.Designed device can provide effective foam bursting on collapse foam.  相似文献   

Use of neural networks for the prediction of frictional drag and transmission of axial load in horizontal wellbores     

Tanvir Sadiq  Ridha B. Gharbi  Hans C. Juvkam‐Wold 《国际地质力学数值与分析法杂志》2003,27(2):111-131

The use of mud motors and other tools to accomplish forward motion of the bit in extended reach and horizontal wells allows avoiding large amounts of torque caused by rotation of the whole drill string. The forward motion of the drill string, however, is resisted by excessive amount of friction. In the presence of large compressive axial loads, the drill pipe or coiled tubing tends to buckle into a helix in horizontal boreholes. This causes additional frictional drag resisting the transmission of axial load (resulting from surface slack‐off force) to the bit. As the magnitude of the frictional drag increases, a buckled pipe may become ‘locked‐up’ making it almost impossible to drill further. In case of packers, the frictional drag may inhibit the transmission of set‐up load to the packer. A prior knowledge of the magnitude of frictional drag for a given axial load and radial clearance can help avoid lock‐up conditions and costly failure of the tubular. In this study a neural network model, for the prediction of frictional drag and axial load transmission in horizontal wellbores, is presented. Several neural network architectures were designed and tested to obtain the most accurate prediction. After cross‐validation of the Back Propagation Neural Network (BPNN) algorithm, a two‐hidden layer model was chosen for simultaneous prediction of frictional drag and axial load transmission. A comparison of results obtained from BPNN and General Regression Neural Network (GRNN) algorithms is also presented. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

综合物探方法在广西罗城县活动断裂鉴定中的应用     

吴教兵  黎峻良  江兰  陆俊宏  潘黎黎  韦王秋 《物探与化探》2021,(2):346-354

城市活动断层探测在城市发展建设过程中和保障人民生命财产安全方面起到重要作用。本文以鉴定罗城断裂和上天桥—寺门断裂活动性为目的,在地震地质调查确定其断裂的几何学、运动学和年代学的基础上,选择第四系覆盖断裂最有可能活动的地段,重点采用高密度电法和地震映像方法来探测断裂在隐伏地段的具体位置,通过排钻验证,以及揭露其断裂与第四纪覆盖层之间的错断关系,来确定其断裂最新活动年代。结果表明,高密度电法和地震映像综合物探方法准确探测到了罗城断裂和上天桥—寺门断裂在隐伏地段的位置,且钻孔岩心中断裂面、断裂擦痕、断裂碎裂岩和构造角砾岩等发育,但断裂未错断第四系覆盖层,从而确定其断裂活动年代为早更新世。根据相关规范要求,罗城断裂和上天桥—寺门断裂全新世以来不活动,罗城县的建设规划可不采取避让措施,该鉴定结果为今后罗城县的工程建设提供了安全保障。  相似文献   

深部地质钻探孔内钻杆动力响应特性研究     

瞿坤 《矿产与地质》2021,(1):148-153

深部地质钻探时,钻杆受力条件复杂,振动形式多变且剧烈。为认识钻杆的动力学特征,减少钻杆失效风险,提高钻进效率,建立了仅考虑纵向振动和扭转振动耦合作用下的深部地质钻杆动力学分析模型,并推导了钻杆固有振动频率公式,在此基础上,借助ANSYS软件进行仿真分析。研究成果表明:在纵向(扭转)振动下,随着模态阶数的增加,钻杆的轴向(角)位移变化越来越复杂;随着模态阶数的增加,钻杆的固有频率呈现线性增加;在相同模态阶数条件下,随着深度的增加,固有频率逐渐降低,但其降幅逐渐减小;当激振频率与钻柱纵向(扭转)振动固有频率相近时,钻杆的轴向(角)位移达到极值。  相似文献