气举技术应用于深海无隔水管泥浆回收钻井工艺可行性分析          下载免费PDF全文

陈浩文  于彦江  王艳丽  秦如雷  田烈余  王偲  殷国乐  王林清  谢文卫  冯起赠 《探矿工程》2022,49(2):9-15

无隔水管泥浆回收钻井技术作为新兴钻井技术,具有安全环保、简化井身结构和降低钻探风险等优点。传统的无隔水管泥浆回收钻井技术依靠水下泵将海底井口泥浆举升至甲板面,该方式对水下泵的举升能力及可靠性要求极高。未来深海钻井领域,水下泵将会是限制无隔水管泥浆回收钻井技术应用的“瓶颈”。本文借鉴陆地气举反循环钻井原理,利用气举技术部分或完全替代水下泵,分别从设备技术现状、流量可调性、适用环境、井控安全等方面探究气举用于无隔水管泥浆回收技术的可行性。结果表明,气举反循环技术及相关设备性能满足无隔水管泥浆回收的使用要求,而且具有上返流量可调、安全等特点,有较高的研究应用价值。  相似文献   

玄武岩纤维堵漏体系在高海拔非开挖钻进中的应用研究          下载免费PDF全文

周生伟  孙平贺  苏卫锋  周梦迪  夏余宏烨  周明明  左雷彬  王李昌 《探矿工程》2022,49(3):139-145

高海拔地区实施非开挖水平定向钻进时,裂隙发育地层的泥浆漏失不仅会影响泥浆的有效循环,还会形成大量的岩屑床,导致钻具过度磨损、摩阻异常增大、有效孔径减小等问题。针对西藏某地钻遇花岗岩裂隙,采用近景摄影测量技术对其进行量化表征,得到该区裂隙地层的缝宽<4 mm;提出采用玄武岩纤维作为裂隙封堵主剂,并建立随钻玄武岩纤维堵漏配方体系,实验结果表明：采用3、6和9 mm多级组合的玄武岩纤维堵漏效果最好,3 mm纤维复合惰性材料形成骨架结构,6和9 mm纤维可发挥一定强度的“加筋”作用。现场随钻实验结果表明：采用玄武岩纤维堵漏后,泥浆中固相含量下降幅度减少了13.14%,有效保障了长距离裂隙山体的有效、绿色、安全钻进。  相似文献   

银额盆地蒙苏地1井钻井设计与施工          下载免费PDF全文

钱锋  赵远刚  黄晓林  石绍云  罗显粱 《探矿工程》2022,49(5):136-144

蒙苏地1井是中国地质调查局部署在银额盆地艾特格勒凹陷的一口大口径重点油气地质调查井,根据该区块地层地质概况和钻井施工技术难点,从井身结构、钻具组合、钻头选型和钻进工艺等方面对蒙苏地1井钻井工程进行了优化设计。综合采用 “简化井身结构+非常规钻具组合+常规钻头选型+强抑制性泥浆”的钻井技术方案,解决了中生界巴音戈壁组和二叠系上部地层的高硬度、可钻性差、裂缝构造易井斜及井壁失稳等一系列难题,顺利完成了该井的钻井施工任务。该井完钻井深2763.66 m,完钻口径215.9 mm,平均机械钻速3.51 m/h,成功揭示了中生界和石炭-二叠系岩石组合特征及含油气性,优质、高效、零事故完成各项目标任务。  相似文献   

淮南矿区新集二矿1煤地面排水钻孔的设计施工     

王伟 《中国煤炭地质》2012,(3):71-73

新集二矿的主采煤层位于山西组的底部,受到下伏太原组岩溶裂隙含水层的威胁。为缓解井下的防治水压力．采用了在地面施工排水孔的防治水思路。根据钻孔的位置及地层情况,采用了泥浆循环钻进与空气潜孔锤钻进相结合的方法。由于在钻孔施工过程中,发生了泥浆向巷道渗漏的情况,为保证钻孔施工安全及井下生产安全而对钻孔设计深度进行了调整,从而顺利的完成了该孔的钻探施工任务。此孔的成功,可为类似地区施工矿井防治水钻探工程提供借鉴。  相似文献   

Development of a river delta: a case study of Cimanuk river mouth,Indonesia     

Nita Yuanita  Tawatchai Tingsanchali 《水文研究》2008,22(18):3785-3801

This paper describes delta development processes with particular reference to Cimanuk Delta in Indonesia. Cimanuk river delta, the most rapidly growing river delta in Indonesia, is located on the northern coast of Java Island. The delta is subject to ocean waves of less than 1 m height due to its position in the semi‐enclosed Java Sea in the Indonesian archipelago. The study has been carried out using a hydrodynamic model that accounts for sediment movement through the rivers and estuaries. As an advanced approach to management of river deltas, a numerical model, namely MIKE‐21, is used as a tool in the management of Cimanuk river delta. From calibration and verification of hydrodynamic model, it was found that the best value of bed roughness was 0·1 m. For the sediment‐transport model, the calibration parameters were adjusted to obtain the most satisfactory results of suspended sediment concentration and volume of deposition. By comparing the computed and observed data in the calibration, the best values of critical bed shear stress for deposition, critical bed shear stress for erosion and erosion coefficient were 0·05 N m^?2, 0·15 N m^?2, and 0·00001 kg m^?2 s^?1, respectively. The calibrated model was then used to analyse sensitivity of model parameters and to simulate delta development during the periods 1945–1963 and 1981–1997. It was found that the sensitive model parameters were bed shear stresses for deposition and erosion, while the important model inputs were river suspended sediment concentration, sediment characteristics and hydrodynamic. The model result showed reasonable agreement with the observed data. As evidenced by field data, the mathematical model proves that the Cimanuk river delta is a river‐dominated delta because of its protrusion pattern and very high sediment loads from the Cimanuk river. It was concluded that 86% of sediment load from the Cimanuk river was deposited in the Cimanuk delta. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

低轨卫星初始状态误差对反演地球重力场的影响     

张兴福  沈云中 《测绘科学》2009,34(3)

基于动力学法反演地球重力场的基本理论,研究了卫星初始状态向量误差对应用低轨卫星精密轨道数据反演地球重力场的影响。在仅考虑低轨卫星初始状态误差的情况下进行了模拟计算,结果表明:在利用低轨卫星精密轨道数据反演地球重力场时,卫星初始状态向量误差需要重新进行估计;在目前的轨道精度水平下,若不顾及误差方程二次项的影响,反演弧长不宜过长;卫星初始状态速度误差(约1.5mm/s)的影响要大于位置误差(约10 cm)的影响。  相似文献   

Further discussion on the intercomparison of the trace metal concentrations and particle size of fluvial sediment recovered from two centrifuge systems     

S. Santiago  R. L. Thomas  J.-L. Loizeau  P.-Y. Favarger  J.-P. Vernet 《水文研究》1990,4(3):283-287

A single large volume water sample taken at the mouth of the Upper Rhone River on Lake Geneva was processed directly in parallel through two continuous flow centrifuges, a Westphalia and an Alfa-Laval. Sediment was recovered from the Westphalia, and separately from the bowl and brass core of the Alfa-Laval. The three sediment samples were analyzed for particle size and the following elements: Zn, Cu, Mn, Cr, P, Co, B, V, Be, Sr, Na, Pb, Ni, Ba, Fe, Ca, and Mg. Results indicate that the particle size recovery of both machines is similar when sediment from the brass core and bowl of the Alfa-Laval are combined, and that the recovery for all elements other than Cu, V, B, and Pb are the same when the particle size differences are taken into account. Sediment from the Alfa-Laval brass core is clearly contaminated by Cu, B and is also elevated in V and Pb but not to a significant extent. The sediment recovered from the bowl of the Alfa-Laval is contaminated only with Cu, with a 10 ppm increase over the 52 ppm recovered in the Westphalia sediment. Operating procedures involve the discarding of the brass core sediment and the mixing of the Alfa-Laval bowl sediment with that from the Westphalia. The consequent increase in Cu is estimated at less than 5 ppm or within the confidence level of the analysis. These procedures are recommended to all operators of non modified Alfa-Laval units.  相似文献   

提高机采水平的配套技术及应用     

张健泉  吴凤英  师清磊 《海洋地质译丛》2008,(4):70-72

随着濮城油田的持续性高速开发,油田综合含水逐渐上升,油水井井况进一步恶化,作为油田生产主体的机械采油井躺井频繁、管杆泵使用寿命缩短。近几年中原油田采油二厂濮城油田年平均躺井数达560井次之多,导致机械采油井维护费用增加,管杆泵投入增大,严重制约着油田的生产和经营。通过加缓蚀剂在油管内壁形成保护油膜,起到润滑作用;应用特殊抽油杆防腐止磨;应用尼龙扶正器对抽油杆体扶正,避免了钢体与钢体的硬磨;应用旋转井口通过地面人力转动改变油管与抽油杆的偏磨面;配合合理生产参数;各种配套技术的合理应用,使濮城油田躺井减少,避免了频繁作业,增加长寿井,管杆泵投入节约了19.3%。  相似文献   

正理庄高89-1区块CO2混相驱参数优化数值模拟研究     

史华 《海洋地质译丛》2008,(1):68-73

为了确保高89-1区块CO2混相驱项目的顺利实施,依据该区块的精细油藏描述成果,在优化适于CO2混相驱模型基础上,建立了符合油藏地质特点的三维地质模型。在此基础上对开发指标进行计算,对五个参数（井网、开发方式、压力水平、注入量和采油速度）进行优化,并提出了推荐方案,预测采收率可达23.10%,比弹性开采方式提高15.16%。  相似文献   

低渗油藏采收率确定新方法     

黄小亮  ;唐海  ;吕栋梁  ;李仲  ;吕浙江  ;余贝贝 《海洋地质译丛》2008,(3):74-77

通过对油藏相渗曲线的归一化处理，利用达西定律理论，建立采油指数与含水率的关系；再通过油藏确定的单井经济极限采油量和油藏极限生产压差求出极限采油指数，从而得到极限含水率；最后以最终水驱体积波及系数与储层退汞效率计算出采收率。并以低渗透油藏为实例验证了该方法的正确与适用性，说明该方法对油田开发中确定低渗油藏采收率具有科学的指导意义。  相似文献