共查询到20条相似文献，搜索用时 47 毫秒
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测井中子发生器作为中子源目前应用于地层岩性、孔隙度、含油饱和度及地层动态监测测井,是C/O测井、中子寿命测井、氧活化水流测井以及脉冲伽马能谱测井等仪器的核心部件.简要介绍了几种国外测井中子发生器的产品.阐述了测井中子发生器的工作原理、基本构成及关键技术.介绍了中国石油测井有限公司测井仪器厂研制生产的中子发生器产品系列.脉冲中子伽马测井是当前油田生产动态监测普遍采用的技术.介绍了实现宽频带、锐截止的技术途径以及目前所取得的成果.中子发生器产额的稳定性及开机重复率指标的提高将会极大拓宽其应用领域,尤其在使用同位素中子源的领域,可以替代同位素中子源发挥独到的优势.介绍了中国石油测井有限公司在中子发生器产额稳定方面所做的工作和取得结果,并列举了稳定产额后的中子发生器在元素分析领域所取得的成功试验. 相似文献
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Matthias A. Zenner 《Ground water》2009,47(4):526-535
The impact of nonlinear flow phenomena on well response tests is still not completely understood today. With the present paper, a set of 10 well response tests is investigated. The tests were conducted in a fractured Devonian limestone formation close to the western national border of Germany. The test design incorporates a packer as well as different solid cylinders to initiate a series of slug‐injection and slug‐withdrawal tests by various initial displacements. Nonlinear response characteristics were observed in the course of the tests, which cannot be explained by tubing‐controlled flow inside the cased well. The analysis shows that the nonlinear response characteristics are likely to be either formation controlled according to non‐Darcian flow developing in a high‐conductivity fracture compartment of the tested limestone formation or a consequence of a severe well inefficiency caused by some sort of screen clogging. This inference is obtained from analyzing the data by a nonlinear well response test model, which differentiates between wellbore internal hydraulic head losses and a generalized rate‐dependent skin effect accounting for nonlinear flow processes in the vicinity of the well. The potential of identifying near‐well nonlinear flow by various displacement well response testing may indicate this methodology to be a valuable complement to modern high‐resolution borehole imaging techniques used when characterizing fractured reservoirs and the tightness of fractured reservoir cap rocks. 相似文献
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在地震勘探资料处理中,子波的零相位化有助于提高地震资料的分辨率、改善叠加剖面的质量.常规的相位校正方法是利用测井合成记录对井旁地震记录进行相位估计,然后对整条剖面进行常相位校正,该方法没有考虑地震子波相位的非稳态性（相位随时间和空间变化）.虽然通过局部相似度方法利用最大方差模准则或包络最大相似度准则可以估计出随时间和空间变化的相位属性,但是由于零相位判别准则本身具有一定的局限性,因此精度有限.针对这一问题,本文在局部地震属性和局部平面波模型下,提出了一种井约束的非稳态相位校正方法,该方法不仅考虑了子波相位的非稳态性,而且充分利用了测井合成地震记录进行相位校正精度高的优点.理论模型和实际资料处理表明,本文方法可以有效实现信号的零相位化,有利于改善叠加效果,提高资料的分辨率. 相似文献
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Energy Optimization of Well Fields 总被引：1，自引：0，他引：1
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Vic Kelson 《Ground water》2012,50(6):918-926
Groundwater flow models are commonly used to design new wells and wellfields. As the spatial scale of the problem is large and much local‐scale detail is not needed, modelers often utilize two‐dimensional (2D) or quasi three‐dimensional models based on the Dupuit‐Forchheimer assumption. Dupuit models offer a robust set of tools for simulating regional groundwater flow including interactions with surface waters, the potential for well interference, and varying aquifer properties and recharge rates. However, given an assumed operating water level or drawdown at a well screen, Dupuit models systematically overpredict well yields. For design purposes, this discrepancy is unacceptable, and a method for predicting accurate well yields is needed. While published methods exist for vertical wells, little guidance is available for predicting yields in horizontal screens or collector wells. In plan view, a horizontal screen has a linear geometry, and will likely extend over several neighboring cells that may not align with rows or columns in a numerical model. Furthermore, the model must account for the effects of converging three‐dimensional (3D) flow to the well screens and hydraulic interference among the well screens; these all depend on the design of a specific well. This paper presents a new method for simulating the yield of angled or horizontal well screens in numerical groundwater flow models, specifically using the USGS code MODFLOW. The new method is compared to a detailed, 3D analytic element model of a collector well in a field of uniform flow. 相似文献
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Fred Rothauge 《Ground water》2018,56(3):360-360
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Martin C. Christman Craig H. Benson Tuncer B. Edil 《Ground Water Monitoring & Remediation》2002,22(3):104-112
Geophysical logging was conducted in 35 in-service water and monitoring wells installed in unconsolidated sediments using a downhole ultrasonic probe to assess how sealant type, construction method, and site geology affect annular seals. Collapsed sand and gravel was frequently detected in the annulus of wells constructed with mud-rotary methods, precluding the placement of sealant and, in some wells, potentially providing a preferential pathway for contamination. High-solids bentonite grout appeared to create high-quality seals when formation materials did not collapse into the annulus. Seals composed of bentonite chips and pellets remained intact when hydrated upon placement; those not hydrated during placement remained dry and porous, posing a risk of surface water infiltration. Seals made with cement-bentonite grout were generally unsaturated and possibly cracked. Analysis of the data suggests that well designers should specify a construction method that minimizes collapse of the formation to ensure that the sealant is placed where intended. When collapse is avoided, high-solids bentonite grout and hydrated bentonite chips and pellets appear to yield intact seals. However, bentonite chips and pellets may not hydrate adequately in the annulus unless hydration water is added during installation. When cement-bentonite grouts are used, the well designer should ensure that the grout will remain intact and plastic after installation. 相似文献
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P. Latinopoulos 《Advances in water resources》1982,5(4):233-235
Analytical solutions for groundwater flow in rectangular aquifers are presented in the case of a single-well recharge. The problem concerns the impact of a seasonal recharge scheme of variable duration on aquifers with various boundary conditions. The results obtained from these idealized aquifers can be used in a preliminary assessment of the groundwater response to artificial recharge schemes. 相似文献