密集交叉井网井眼轨道精确制导技术的应用          下载免费PDF全文

陈虎  和鹏飞 《探矿工程》2017,44(1):41-45

本着充分依托原有海上油田设施降本增效原则,渤海Q油田在原有生产平台附近新建井口平台、对原有密集井网成功实施了整体加密调整,作业难度急剧增大。通过老井眼数据再处理、新井轨道设计优化、轨道防碰设计、防碰监测等手段形成密集交叉井网井眼轨道精确制导技术。该技术的成功应用提高了作业时效,有效保障了在老油田密集交叉井网整体加密井眼轨迹的顺利实施、减小了碰撞风险。  相似文献   

C6H水平井三维轨迹优选与控制技术          下载免费PDF全文

边杰  崔爱贞  和鹏飞  袁则名  齐斌 《探矿工程》2017,44(5):24-26

渤海北部LD油田在井网加密、油田大规模综合布置新钻调整井时,存在新钻的25口井与老井井网交叉、井眼轨迹立体三维缠绕问题,其中C6H水平井是此类问题的典型,同时C6H井还需要在可钻性极差的馆陶组底砾岩地层定向造斜。针对上述问题,通过C6H井3种轨迹方案对比、分析,优选出最为有利的方案,结合螺杆马达和旋转导向工具性能分析,最后采用螺杆马达 水力震荡器 微偏心稳定器等钻具组合新方式,顺利实施了C6H井。  相似文献   

GPS定位技术在新粤浙管道穿越长江中的应用     

李令伟 《东北测绘》2013,(2):101-102

管道穿越大型河流、沟堑一直以来都是油气长输工程的重中之重,穿越测量时的控制不但是测图的依据,还是后期施工的依据,这就要求所做的控制要满足测图和施工放样的双重需要。在现在的工程测量中,GPS定位技术应用越来越广泛,利用GPS定位技术为本工程做首级控制,取得了较好的效果。  相似文献   

一种改进的点与多边形关系的叉乘判别法   总被引：1，自引：0，他引：1  

马晨  张毅 《测绘科学》2013,38(1):125-127

本文针对叉乘判别法只适用于凸多边形的缺陷提出了改进,将其推广至凹多边形和自相交多边形,改进方法利用叉乘值的正负变化,选择对点的积分路径,从而判断是否有闭合的路径包围被测点。并通过检测多边形是否环绕被测点,判断点与多边形的关系,属于非零环绕数法。经过实验,改进方法被证明有较快的速度和较强的适应性。  相似文献   

Earthquake evidence for compressive stress in the southeast Australian crust   总被引：1，自引：1，他引：0  

David Denham  Janet Weekes  Clementine Krayshek 《Australian Journal of Earth Sciences》2013,60(3-4):323-332

Earthquakes in SE Australia are usually caused by compressive stresses acting in the crust, and are associated with steeply dipping faults. Sometimes the faulting is predominantly strike‐slip, as for the Bowning earthquakes of 1977 and some of the Dalton/Gunning earthquakes; and sometimes it is high‐angle thrust faulting, as for the 1961 Robertson and 1973 Picton earthquakes. No surface expression of the faults associated with any recent earthquakes in SE Australia has been reported.

The directions of the pressure axes, from all the earthquakes for which focal mechanisms have been determined, do not form a consistent pattern. This suggests that the faulting associated with earthquakes in SE Australia is dominated by the geometry of pre‐existing crustal faults or zones of weakness.

In situ stress measurements have not been made near the epicentral areas of the larger recent earthquakes, because of the absence of competent, near‐surface rocks coupled to the crust. However, in the western part of the Lachlan Fold Belt the in situ stress results indicate that the maximum pressure axis is approximately E‐W. The evidence from the focal mechanisms does not preclude the persistence of this stress regime farther to the east, and a regional compressive stress in the crust with an azimuth of about 120° is consistent with most of the earthquake focal mechanisms and the in situ stress measurements throughout SE Australia.  相似文献   

A depositional model for a wave‐dominated open‐coast tidal flat,based on analyses of the Cambrian–Ordovician Lagarto and Palmares formations,north‐eastern Brazil     

GIORGIO BASILICI  PEDRO HENRIQUE VIEIRA DE LUCA  ELSON PAIVA OLIVEIRA 《Sedimentology》2012,59(5):1613-1639

Open‐coast tidal flats are hybrid depositional systems resulting from the interaction of waves and tides. Modern examples have been recognized, but few cases have been described in ancient rock successions. An example of an ancient open‐coast tidal flat, the depositional architecture of the Lagarto and Palmares formations (Cambrian–Ordovician of the Sergipano Belt, north‐eastern Brazil) is presented here. Detailed field analyses of outcrops allowed the development of a conceptual architectural model for a coastal depositional environment that is substantially different from classical wave‐dominated or tide‐dominated coastal models. This architectural model is dominated by storm wave, low orbital velocity wave and tidal current beds, which vary in their characteristics and distribution. In a landward direction, the storm deposits decrease in abundance, dimension (thickness and spacing) and grain size, and vary from accretionary through scour and drape to anisotropic hummocky cross‐stratification beds. Low orbital wave deposits are more common in the medium and upper portion of the tidal flat. Tidal deposits, which are characterized by mudstone interbedded with sandstone strata, are dominant in the landward portion of the tidal flat. Hummocky cross‐stratification beds in the rock record are believed, in general, to represent storm deposits in palaeoenvironments below the fair‐weather wave base. However, in this model of an open‐coast tidal flat, hummocky cross‐stratification beds were found in very shallow waters above the fair‐weather wave base. Indeed, this depositional environment was characterized by: (i) fair‐weather waves and tides that lacked sufficient energy to rework the storm deposits; (ii) an absence of biological communities that could disrupt the storm deposits; and (iii) high aggradation rates linked to an active foreland basin, which contributed definitively to the rapid burial and preservation of these hummocky cross‐stratification deposits.  相似文献   

海底地震仪自噪声分析          下载免费PDF全文

贾正大  李军  金星  林彬华 《中国地震》2022,38(3):486-493

海底地震仪是海上观测天然地震的主要手段,仪器所记录到的噪声分为环境噪声和仪器噪声。本文利用2018年9月3日—2019年7月1日期间浯屿岛海底地震观测台所采集到的数据,对海洋环境下的强震型海底地震采集站和宽频带海底地震采集站进行仪器自噪声分析,利用两道互相关模型,采用加窗平均周期图法计算功率谱,通过1/3倍频程积分作平滑处理,得到仪器自噪声功率谱密度图。对比分析相同型号仪器的自噪声功率谱,发现相同仪器的自噪声变化趋势一致,但自噪声大小有差异,且这种差异对于不同仪器、相同仪器的不同分量也存在不同。  相似文献   

三维电磁阵列剖面法的基本原理及应用   总被引：3，自引：0，他引：3  

刘宏  王家映 《地球物理学进展》1997,12(1):61-73

本文论述了三维电磁阵列剖面法的基本原理，并从理论上论述了大地电磁测深中的静态效应是由电磁响应中与频率无关的静态项引起的，基于这一原理，本文提出了三维ＥＭＡＰ野外采集方式和数据处理方程。三维ＥＭＡＰ法不仅能消除ＭＴ中的静态效应，而且由于采集信息量大大增加，较常规ＭＴ有更好的地质效果，文中给出的实例证明了这一点。  相似文献   

Generating Velocities in Precursor Soliton Generation in a Straight Channel with Arbitrary Cross Section     

徐肇廷  李臻  徐昊 《中国海洋大学学报(自然科学版)》1999,(2)

利用准三维的ｆＫｄＶ方程及四区间划分法,理论上求得了先锋孤立子生成诸速度—先锋孤立子的运动速度、压水区中流的速度及尾波列第一个跨零点的速度。所述理论是Ｘｕ等人的先锋孤立子生成理论的一个推广。作为应用的例子,运用作者得到的理论结果,对具有相同截面面积的等腰三角形和正方形截面的直渠中先锋孤立子生成的诸速度进行了理论预报和数值比较。比较指出,理论和数值结果吻合得很好。  相似文献   

一种合成2,2-二甲基-4-戊烯酸的方法     

钱佐国  孙明昆  李东慧  邹忠英 《中国海洋大学学报(自然科学版)》1999,(2)

报道一种合成２,２－二甲基－４－戊烯酸的新方法。由异丁醛与烯丙醇缩合得到２,２－二甲基－４－戊烯醛,后者经氧化银选择氧化生成２,２－二甲基－４－戊烯酸。此法氧化产率（９６％）高于分子氧氧化法（６１％）和歧化法（４１％）。反应中析出的金属银能定量回收,循环使用。  相似文献