圆形和长条形储层连通程度的预测方法

为了更准确地预测开发井网与储层连通程度的关系，通过建立圆形储层和长条形储层连通程度的数学模型，推导了不同形态储层连通程度的预测方法。研究表明，不同形态储层的连通程度与储层形态和井距有一定的关系。实践表明，这种方法的预测结果与实际情况吻合较好。有利于开发井网的优化。     

钻井液用GPJ系列广谱暂堵剂的研制

在使用屏蔽暂堵技术保护油气层时，只有当所用的暂堵剂粒径与油气层的孔喉直径严格匹配时，才能形成高质量的屏蔽暂堵环，但在实际应用过程中，很难做到“严格匹配”。开发出了一种钻井液用新型广谱暂堵剂GPJ系列产品。该暂堵剂不用与地层孔径进行匹配，只需根据地层温度选择产品型号。新型GPJ系列广谱暂堵剂可通过其软化、变形及静电吸附作用快速地在近井壁处形成一层韧性强、渗透性低的“油膜”暂堵屏障，最大限度地阻止钻井液中的固相和液相侵入油气层。其暂堵效果对地层孔径的依赖性小，对孔径范围为3～33μn、的岩心的封堵率高于92％，暂堵深度约为3．5mm，而且暂堵层抗压强度高，返排解堵效果好。     

Investigation on pulsed discharge mode in SF_6-C_2H_6 mixtures

The non-chain chemical HF(DF)laser is one of the most powerful electrically-driven lasers operating in mid-infrared,in which SF6-C2H6 mixtures are often used as lasering media.Due to the electronegativity of SF6,the discharge in SF6-C2H6 presents a complicated discharge mode.To achieve reproducible pulsed laser output,pulsed discharge in SF6-C2H6 mixtures is investigated for discharge mode using plane electrodes assisted by array pre-ionization spark pins in cathode surface.Firstly,two modes can be distinguished.One mode is called the selfsustained volume discharge(SSVD),which is characterized by spatial uniformity in the discharge gap and pulse to pulse repeatability.On the contrary,another mode includes random arc passages in the discharge gap and therefore cannot conduct lasering.By varying discharge conditions(gap voltage,gas pressure,etc)two discharge modes are observed.Secondly,the holding scope of the SSVD mode is analyzed for the optimal mixture ratio of 20:1,and the boundary tend of the holding scope of SSVD indicates there exists maximum gas pressure and maximum charging voltage for SSVD.Finally,the peak current of SSVD relates positively to charging voltage,while negatively to gas pressure,from which it is drawn that synchronous electron avalanches initiated by the sliding array overlap spatially into SSVD and thus SSVD is essentially an α ionization avalanche.     

计算油井措施真实增油量的新方法

油井措施投入决策是油藏经营管理中的重要内容,矿场上现行的措施增油量计算方法存在明显不足,在很多情况下不能正确反映每次油井措施的真实增油量,严重影响了油井措施效果和效益分析评价工作的进行。本研究提出了油井措施真实增油量的计算方法,新方法考虑了不同日期实施的措施间的相互影响,并可进行任意时间段内的措施增油量分析,以大港某油田2002年56井次9类油井措施的计算为实例,证明新方法客观、真实地反映措施的实际效果和措施的实际经济效益,有助于科学指导措施投入决策,以效益的观念经营管理油藏。     

基于非线性频谱数据驱动的动态系统故障诊断方法

基于非线性频谱数据驱动方法, 研究了动态系统的故障诊断问题. 利用一维非线性输出频率响应函数提出一种非线性频谱特征提取方法, 为了提高实时性, 采用变步长自适应辨识算法进行求解; 根据估计偏差实时地改变步长, 兼顾了收敛速度与稳态误差; 获取了非线性频谱特征之后, 利用最小二乘支持向量机分类器进行故障识别. 通过对提升设备的故障诊断问题进行实验研究, 所得结果表明, 所提出的算法识别率高, 能满足在线诊断要求.     

Photographic Study on Spark Discharge Generated by a Nanosecond High-Voltage Pulse over a Water Surface

Spark discharge generated by a nanosecond positive high-voltage pulse over a water surface at atmospheric pressure in air was studied using a high speed camera system.Faint streamers form near the pin electrode and propagate towards the water surface.The time for the streamer propagating across the air gap was estimated to be about 50 ns to 60 ns with a propagation velocity of~1.3×10~5 m/s.It was found that the water conductivity and the gap distance have no significant effect on the propagation velocity of the streamer.After the streamers touch the water surface a brilliant spark channel forms across the air gap.The maximum diameter at the middle of the spark channel is about 1 mm,and approximately contracts with a radical velocity of about 2.0×10~3 m/s.No significant dependence of the maximum diameter and decay velocity of the spark channel on the water conductivity and the gap distance were recognized in the present work.The maximum conduction current for a gap distance of 5 mm is significantly larger than that for a gap distance of 10 mm at the same water conductivity,and shows an increasing tendency with increasing water conductivity for a fixed gap distance.Based on the maximum conduction current,the effect of water conductivity and gap distance on the electron density of the spark discharge plasma at the peak current was investigated.Within the range studied,the electron density in the spark channel is about 10~(15)cm~(-3)and increases with water conductivity at a fixed gap distance.     

Diagnostics of Argon Inductively Coupled Plasma and Dielectric Barrier Discharge Plasma by Optical Emission Spectroscopy

1. IntroductionArgon plasma has been frequently used for mate-rial processing and film fabrication processes [1l [21 [31.The efficiency of these processes has very close rela-tion with plasma parameters [4][5], such as ion den-sity, electron temperature and ion energy dlstrlbu-tion. Lots of research has been done on the relation-ship between efficiency and availability of materialprocessing and plasma parameters [6][7].Both lCP dlscharge and DBD discharge are newtype plasma systems developed…     

网架的模块变换设计法

本文提出了一种新的网架结构设计方法，以取为模块的网架为基础，经过简单的变换，设计出要求出网架，其设计思路形象，计算过程快捷。     

低渗透油藏转变注水开发方式研究 ——以大港油田孔南GD6X1区块为例

低渗透油藏常规注水开发生产井受效程度低、低产低液、经济效益差,传统水驱开发技术已无法适应低渗透油藏经济有效开发的要求,而借鉴致密油体积压裂后衰竭开采的开发方式,虽然可提高单井初期产能,但由于低渗透油藏砂体规模小、地层压力系数低和原油黏度高、气油比低等特点,仍存在产量递减快、累积产油量和采收率低等问题,因此迫切需要调整开发思路,转变注水开发方式。为此,提出了低渗透油藏由径向驱替向线性驱替转变,由连续注水向注水吞吐、异步注采和油水井互换等渗吸采油方式转变,由缩小井距提高水驱动用储量向体积改造提高单井缝控储量转变的3个转变注水开发方式的新思想;创建了全新的“体积压裂+有效驱替+渗吸采油”开发模式,并应用于大港油田孔南GD6X1区块,初步实施效果显著。