东濮凹陷砂岩储集层物性参数关系研究及随钻应用方法

储集层的物性参数是评价储集层的重要基础数据，对储集层评价的准确程度有较大影响，文章统计分析结果表明砂岩储集层岩石密度与储集层主要物性参数之间有良好的相关性。以区域统计规律为基础，建立了东濮凹陷砂岩储集层体积密度与孔隙度和渗透率的关系方程。介绍了录井施工现场应用岩屑样品体积置换法、泥岩密度计法两种常规检测方法，能较准确的获取砂岩储集层的体积密度，反演计算孔隙度和渗透率数据，合理评价储集层物性参数，为准确评价储集层提供了可信度高的重要基础数据，从而弥补了录井现场物性参数获取不足的缺陷，在随钻评价油气储集层过程中有一定的实用价值。     

低渗透油田水力割缝降低原地应力数值模拟研究

低渗透油田增产增注问题一直是广大科技工作者研究的重点,基于ANSYS有限元软件建立了胜利某低渗透油井水力割缝的三维立体有限元模型,并对钻井和水力割缝后井筒及近井地带的应力变化进行了数值模拟,给出了定量化的X、Y、Z向应力在割缝后的应力降范围和分布规律,指出割缝方向是决定水力割缝效果和有效性的关键因素,数值模拟分析表明,在地下15 0 0m深处,通过水力割缝技术可以大大降低井筒及近井地带的地应力,从而达到解堵及增产增注的目的。其计算结果与实际采油经验基本吻合,说明所建模型是合理的。该数值模拟方法对现场科学评价水力割缝的效果和可靠性,优化水力割缝的技术工艺参数具有一定的指导意义     

Effects of fluctuating river flow on groundwater/surface water mixing in the hyporheic zone of a regulated,large cobble bed river

Physicochemical relationships in the boundary zone between groundwater and surface water (i.e. the hyporheic zone) are controlled by surface water hydrology and the hydrogeologic properties of the riverbed. We studied how sediment permeability and river discharge altered the vertical hydraulic gradient (VHG) and water quality of the hyporheic zone within the Hanford Reach of the Columbia River. The Columbia River at Hanford is a large, cobble‐bed river where water level fluctuates up to 2 m daily because of hydropower generation. Concomitant with river stage recordings, continuous readings were made of water temperature, specific conductance, dissolved oxygen and water level of the hyporheic zone. The water level data were used to calculate VHG between the river and hyporheic zone. Sediment permeability was estimated using slug tests conducted in piezometers installed into the river bed. The response of water quality measurements and VHG to surface water fluctuations varied widely among study sites, ranging from no apparent response to covariance with river discharge. At some sites, a hysteretic relationship between river discharge and VHG was indicated by a time lag in the response of VHG to changes in river stage. The magnitude, rate of change and hysteresis of the VHG response varied the most at the least permeable location (hydraulic conductivity (K) = 2.9 × 10^?4 cms^?1) and the least at the most permeable location (K = 8.0 × 10^?3 cms^?1). Our study provides empirical evidence that sediment properties and river discharge both control the water quality of the hyporheic zone. Regulated rivers, like the Columbia River at Hanford, that undergo large, frequent discharge fluctuations represent an ideal environment in which to study hydrogeologic processes over relatively short time periods (i.e. days to weeks) that would require much longer periods (i.e. months to years) to evaluate in unregulated systems. Copyright © 2006 John Wiley & Sons Ltd.     

对城市雨水资源利用的思考

随着城市规模的不断扩大,不透水地面也随之增加,给城市生态环境带来的负面影响逐渐显现.可通过渗透等方式拦蓄雨水补充地下水、调节城市生态环境.介绍几种简便易行的雨水渗透设施和方法,分析对改善城市生态环境的作用.     

保护储层的新型完井液体系研究

在研究歧口１８－１油田储层岩心的敏感性、完井液处理剂及体系的防膨性、与储层水的配伍性和对储导损害程度的基础上，对用于该油田的原有完井液处理剂及体系进行了评价试验。     

高压水射流除垢机理研究

本文根据流体力学的基本方程－积分形式的能量方程、连续性方程和动量方程，推导出高压水射流作用在管壁污垢上的应力计算公式，从理论上分析了高压水射流除垢机理，提出了根据不同管垢的耐压强度极限应力设计喷嘴结构及射流压力选择的理论方法，对现场应用具有重要指导意义，本文所述理论方法及计算公式未见有公开文献报道。     

安塞特低渗透油田集输工艺技术

本文论述了安塞油田主要特点是：低渗、低压、低产，自然环境恶劣，油田地工程建设难度大。在开发建设中，通过科技攻关，研究出一整套适合特低渗透油田特点的生产技术和工艺，形成了独具长庆特色的地面建设模式，有效地降低了工程投资，取得了可观的经济效益。     

Methods to Produce Tl(1223) Tapes with Improved Properties

Different methods to prepare superconducting mono- and multifilamentary T1(I223) tapes were developed. High-purity ceramics could be produced by ex-situ or in-situ reaction under a high isostatic gas pressure. Tapes prepared by the PIT method and an in-situ reaction carried out close to the melting point of the oxide were relatively dense and textured. Interesting results were obtained for samples where part of the oxygen atoms in Tl(1223) had been substituted by fluorine. Critical current densities up to 20'000 A/cm² (77 K, 0 T) were reached for tapes produced by the PIT method. Well textured samples were obtained by electrophoretic deposition, the deposited Tl(1223) grains being produced by a synthesis involving substantial melting.     

砂砾岩油藏油水相对渗透率曲线异常形态成因探讨

据水相相渗曲线形态将河南油田相渗曲线分为正常型、直线型、异Ｉ型及异Ⅱ型４类。重点对异形相渗曲线成因进行了探讨，认为微观孔隙结构的非均质性、１－７μｍ微粒堵喉为主要成因，注入水质为重要影响因素，渗透率及油水粘度比的影响较小。     

NETWORK SIMULATION OF RELATIVE PERMEABILITY CURVES USING A BOND CORRELATED-SITE PERCOLATION MODEL OF PORE STRUCTURE

This paper deals with the conductivity and relative conductivity properties of irregular 3-D networks of pores that represent the continua of the oil phase and the aqueous phase respectively, during steady slate two phase flow in porous media. The relative conductivity properties presented, correspond to the saturation history defined by the drainage, imbibition and secondary drainage capillary pressure curves respectively. Use has been made of the pore accessibility history of a 20 × 20 × 20 network and a 10 × 10 × 10 nodes core portion of the network is used to write the flow equations. A set of 1001 linear equations is solved using the Preconditioned Conjugate Gradients Method for the conductivities of the wetting phase and the non-wetting phase respectively, as a function of network saturation and saturation history. The effects of pore throat size distribution and pore body size distribution on relative permeability behaviour has been investigated. Furthermore, the effect of conductivity function q(D) proportional to Dⁿ (n = 0, 1, 2, 3, 4) on relative permeability behaviour was investigated, where D stands for pore throat diameter and n is an exponent depending on pore geometry.

The results of this work are very significant in elucidating the following points that are not clearly stated in the literature: 1) using the bypassing as the only trapping mechanism, the primary drainage and secondary drainage relative permeability curves are in agreement with experimental findings; 2) more realistic displacement mechanisms in secondary imbibition are required to have better agreement with experimental findings; 3) the correlated network models after the site type problem of percolation theory are realistic models of pore structure; 4) the conductivity function q(D) proportional to D³ is the most appropriate pore throat conductivity function because of lamelar like pore geometries; and 5) accurate prediction of the effective permeability requires knowledge of the porosity and the detailed pore geometry in the pore network, in addition to pore size distributions used in the network simulation.