海上油田开发井钻井优化设计和应用实践          下载免费PDF全文

董振国  熊伟  龚长芳  李进宏 《探矿工程》2021,48(7):46-57

LF7-2油田位于我国南海珠江口盆地LF区块,是一个小规模油田,根据前期探井揭示,上部地层以厚层泥岩为主,极易水化、分散,使钻井液性能变差;起下钻过程中钻具遇卡、遇阻等复杂情况频繁发生;钻头选型不尽合理,易泥包;下部地层以砂泥岩互层为主,岩石致密、可钻性变差,钻具扭矩、摩阻增加,定向钻进时滑动困难,井眼轨迹控制难度大,给钻井提速增效带来诸多困难。根据探井地质情况和岩石力学剖面,利用钻井软件优选平台位置,对开发井井身结构、井眼轨迹、钻柱力学、钻井液、固井等方面进行钻井仿真模拟,制定出科学的钻井设计方案,在直井段采用“牙轮钻头+直螺杆+MWD”钻具开展防斜打直,造斜段使用“PDC钻头+弯螺杆+MWD/LWD”开展复合钻井,水平段采用“PDC钻头+PowerDriver+MWD/LWD”开展旋转导向钻井,实现精准化钻井,顺利完成6口开发井施工。现场应用单井平均机械钻速29.43 m/h,钻井工期191.59 d,工期比设计提前28.41 d,钻井提速增效显著,降低开发成本。通过PowerDriver的近钻头井斜、自然伽马实时测量和传输,减少地质误判,实现对储层顶界面的实时探测,使储层钻遇率达100%,收到较好的经济效益和投资回报,实现小油田的效益开发。  相似文献   

海上高产高含蜡井测试工艺优化研究和应用          下载免费PDF全文

冯大龙  黄伟  谭振兴  袁则名 《探矿工程》2021,48(6):39-43

为研究海上高产高含蜡油气井测试工艺优化方案,以东海西湖凹陷某井测试作业中所暴露出的问题为导向,开展西湖高产高含蜡储集层测试问题原因分析和国内外技术调研,同时进行了测试管柱和地面测试流程的流动性保障技术研究及原油燃烧保障技术研究。研究表明地面流程结蜡、大油嘴放喷返排出大颗粒碎屑及大产量原油燃烧导致燃烧头损坏是影响测试的主要原因,因此对测试管柱、地面测试流程及燃烧保障等进行工艺优化,以解决高产高含蜡油气井测试相关问题。  相似文献   

西太平洋暖池对夏季华东海面日最大风速变化的影响          下载免费PDF全文

韩雪  徐经纬  刘杨珂 《大气科学学报》2021,44(5):727-736

利用1979—2018年ERA Interim地面10 m风场、位势高度场、温度场和风场,Hadley中心HadISST再分析海温资料,采用SVD分析、合成分析等方法,研究了夏季（6—8月）西太平洋暖池关键海域海表面温度（Sea Surface Temperature,简称SST）对华东海域夏季10 m日最大风速变化的影响关系。SVD分析结果表明,夏季华东近海风速变化与菲律宾以东海域SST有明显负相关,第一模态左、右空间向量的时间系数相关达0.58,通过了置信度为95%的显著性检验。当西太平洋暖池SST正异常时,暖池海域SST增高,西北太平洋副热带高压（以下简称副高）加强,副高脊线北进（西北太平洋副高脊线纬度位置与暖池SST相关系数达到0.46,通过置信度为95%显著性检验）。此时华东近海正处于副高控制,近海下沉运动增强,大气温度垂直剖面有普遍增温现象,10 m风场有偏北风异常,海面风速减小约占40 a平均风速的约30%;当暖池SST负异常时,副高东撤南退,华东近海冷空气活动加强,温度垂直剖面存在显著降温现象,华东近海风速增加占40 a平均风速的20%以上。本研究进一步说明了暖池SST异常是一个有效的预报因子,可用于华东近海海面风速预测预报。  相似文献   

Numerical prediction of MODUs drift during Hurricane Katrina     

G.V. Tahchiev  J. Zhang   《Ocean Engineering》2008,35(10):995-1005

Severe hurricanes, such as Katrina, broke the mooring lines of a number of mobile offshore drilling units (MODU) deployed in the Gulf of Mexico and some of those MODUs went adrift. A drifting MODU may damage other critical elements of the offshore oil and gas infrastructure by colliding with floating or fixed production systems and transportation hubs, or by rupturing pipelines owing to their dragging anchors over the seabed. To avoid or mitigate the damage caused by a drifting MODU, it is desirable to understand the mechanics of the drift of a MODU under the impact of severe wind, wave and current and have the capability of predicting the trajectory of the drift. To explore the feasibility and accuracy of predicting the trajectory of a drifting MODU based on hindcast met-ocean conditions and limited knowledge of the condition of the drifting MODU, this study employed a simplified equation describing only the horizontal (surge, sway and yaw) motions of a MODU under the impact of steady wind, current and wave forces. The simplified hydrodynamic model neglects the first- and second-order oscillatory wave forces, unsteady wind forces (owing to wind gustiness), wave drift damping, and the effects of the body oscillation on the steady wind and current forces. It was assumed that the net effects of the oscillatory forces on the steady motion are insignificant. To verify the accuracy and feasibility of our simplified approach, the predicted drifting trajectories of two MODUs were compared with the corresponding measurements recorded by the global positioning system (GPS).  相似文献   

Effective medium modeling to assess gas hydrate and free-gas evident from the velocity structure in the Makran accretionary prism, offshore Pakistan     

Ranjana Ghosh  Kalachand Sain 《Marine Geophysical Researches》2008,29(4):267-274

Seismic properties of sediments are strongly influenced by pore fluids. Stiffness of unconsolidated marine sediment increases with the presence of gas hydrate and decreases with the presence of gas. A strong bottom-simulating reflector (BSR) observed on a seismic profile in the Makran accretionary prism, offshore Pakistan, indicates the presence of gas hydrate and free-gas across the BSR. Elastic properties of gas depend largely on pressure and temperature. We, therefore, first determine the elastic modulus of gas at pressure and temperature calculated at the BSR depth in the study region. The interval velocities derived from the seismic data are interpreted by the effective medium theory, which is a combination of self-consistent approximation and differential effective medium theories, together with a smoothing approximation, for assessment of gas hydrate and free-gas. The results show the saturations of gas hydrate and free-gas as 22 and 2.4% of pore space, respectively, across the BSR.  相似文献   

Distribution of phytoplankton community in relation to environmental parameters in cage culture area of Sepanggar Bay,Sabah, Malaysia   总被引：2，自引：0，他引：2  

Madihah Jaffar Sidik  Md. Rashed-Un-NabiMd. Azharul Hoque 《Estuarine, Coastal and Shelf Science》2008

This paper covers spatial and temporal variation in phytoplankton communities and physico-chemical water properties in the cage culture area of Sepanggar Bay, Sabah, Malaysia based on field measurement conducted during July 2005 to January 2006 to study the spatial and temporal variation in phytoplankton communities and physico-chemical water properties of the bay. Phytoplankton samples and water parameters data were collected from five different stations located inside the bay during Southwest, Interseasonal and Northeast monsoons. Forty phytoplankton genera, representatives of 23 families, were found in the study area with a mean abundance of 1.55 ± 1.19 × 10⁶ cells L⁻¹. Most of these genera belong to diatoms (82.17%), Dinoflagellates (17.55%) and cyanobacteria (0.29%). Three genera were found to be dominant (>10%) in phytoplankton abundance and these were Coscinodiscus spp. (36.38%), Chaetoceros spp (17.65%) and Bacteriastrum spp. (10.98%). The most dominant genus was Coscinodiscus spp. which showed high abundance during all monsoons and stations (except Station 3). Among the seven environmental parameters tested in this study, water temperature, pH and suspended sediment concentration were found to be significantly different between monsoons. On the other hand, no significant differences were found between stations for the studied physico-chemical parameters. A clear differences in phytoplankton densities were observed between monsoons and stations with higher mean abundances during interseasonal monsoon (2.40 ± 1.37 × 10⁶ cells L⁻¹) and at station five (2.05 ± 0.74 × 10⁶ cells L⁻¹), respectively. Conversely, the diversity indices, both Shannon–Wiener (H^′)$\left(H^{\prime }\right)$ and Pielou (J^′)$\left(J^{\prime }\right)$, showed no significant difference throughout stations and monsoons (except (H^′)$\left(H^{\prime }\right)$ for monsoons). Analysis of similarity (ANOSIM) results demonstrated temporal differences in phytoplankton community structure with highly diverse phytoplankton assemblage. Through cluster analysis five groups of phytoplankton were attained (at 40% similarity level) though no marked separation of the taxonomic classes pointed towards the constant pattern of the phytoplankton assemblage in the studied area.  相似文献   

褐菖鲉网箱养殖试验初报   总被引：3，自引：0，他引：3  

陈舜  肖云朴  伍德瀛  李定海 《海洋科学》2008,32(8):5-8

2001年4月30日在浙江南麂海域3 m×3 m×3 m网箱中放养0.9 g自然海区捕获的褐菖鲉(Sebastiscus marmoratus)苗种,进行为期2年多的养殖试验.结果表明,该鱼生长缓慢,养殖38 d体质量为8.3 g,养殖240 d为24.8 g,养殖787 d为112.3 g.总养殖成活率为20.1%,平均日增体质量0.142 g,平均日增体质量率0.62%.秋末至夏初低水温期是褐菖鲉的主要生长期,在9～13℃较低水温下亦会摄食与生长.饵料系数为3.6.冬春季养殖成活率高于秋夏季,第一年夏季养殖成活率低,仅28.1%.养殖方式以混养为宜.  相似文献   

海洋石油工程服务管理研究     

单小麟  高喜峰 《海洋技术学报》2008,27(3)

海洋石油工程具有高投资、高风险、高技术含量等特点.海洋石油工程是项复杂的系统工程,提高服务管理水平,对于保证施工、建造、拖航及安装设置过程的安全,提高效率,进而提高竞争力极为重要.文中提出了海洋石油工程服务管理的系列理论与方法,并提出海洋石油工程服务管理中应注意的事项,为此类工程项目管理提供合理建议.  相似文献   

浅层物探技术在近海灾害地质与工程地质调查中的应用     

王舒畋 《海洋地质译丛》2008,(1):6-12

随着海洋资源的开发与滨岸工程的建设,越来越多地遇到海洋地质灾害的影响与危害。为了避免并降低海洋地质灾害的影响程度,应开展海洋灾害地质与工程地质调查。二十多年来的实践经验表明,若采用以高分辨率地震为主,配合浅地层剖面、旁侧声纳、测深及磁力测量等综合浅层物探技术,对于了解海洋地质灾害因素与海底浅部工程地质特性等方面都能取得良好的效果,这是一种既经济又较快速地提供成果资料的好方法。  相似文献   

用于锦州9-3油田驱油技术的聚合物评价     

刘阳  ;谭祥玲  ;姜伟  ;张健  ;杨光  ;刘义刚 《海洋地质译丛》2008,(4):36-40

聚合物驱油技术适用于非均质的中质和较重质油藏,与其他提高采收率技术比较起来相对简单,更符合海上油田安全环保要求。根据渤海锦州9-3油田油藏特性和聚合物结构性能,结合海上平台特点,研制出具有高效增黏、较好的抗剪切性、良好流动性和驱油效果的高抗盐聚合物3640D。该聚合物首次用于海上油田单井聚合物驱先导试验见到了显著的增油降水效果,正在进行中的井组聚合物驱试验也已初步显示出增产效果,表明聚合物3640D作为锦州9-3油田的驱油剂在技术上是可行的,在海上类似油田的聚合物驱技术中具有广阔的应用前景。  相似文献