煤层气井完井方式的选择

分析了国内外现行的煤层气井完井方式的适用条件及优缺点，提出了煤层气井完井方式的选择依据，推荐了煤层气井完井方式选择流程图。     

劈裂灌浆在龙门水库土坝防渗加固中的应用

结合龙门水库土坝防渗加固工程的实际情况 ,介绍了劈裂灌浆技术的设计和施工工艺 ,根据土坝加固前后渗流变化的资料说明该项技术在水利工程中应用的可行性及其良好的效果     

负压闪蒸—精馏分离原油稳定工艺

给出了负压闪蒸原油稳定与分馏原油稳定的工艺流程及其存在问题，进而提出了负压闪蒸－精馏分离在稳定新工艺，可使Ｃ６拔出率降低到５％，Ｃ４拔出率达到８５％以上，大幅度提高了负压闪蒸原油稳定工艺的分离精度及轻烃收率，确保了原渍稳定质量。该工艺理论可靠，技术先进，经济效益好，具有一定的推广价值。     

简单的稳频He－Ne激光器

稳频He-Ne激光器一般用作精密检测光源。本文介绍一种整体结构小型He-Ne激光器,尺寸小,能用于恶劣环境,寿命长,频率稳定,结构上增加了阴极面积,防止污染,选用了适当的材料和工艺。     

Elastoplastic stability analysis of shells using the physically stabilized finite element SHB8PS

In this paper, we present the formulation of the SHB8PS element, its implementation into the incremental, non‐linear and implicit calculation code Stanlax‐INCA and examples of applications which demonstrate its efficiency. This element is an 8‐node, three‐dimensional cube with a preferential direction called the thickness. Therefore, it can be used to represent thin structures while, at the same time, correctly taking into account phenomena throughout the thickness thanks to the use of a numerical integration with five Gauss points in that direction. This element is subintegrated and thus requires a stabilization mechanism in order to control the hourglass modes. The stabilization technique used is based on the works by Belytschko and Bindeman, which apply an ‘assumed strain method’. The main advantage of this element is the adaptivity of its stabilization term, which is made variable with the elastoplastic evolution throughout the thickness. Copyright © 2003 John Wiley & Sons, Ltd.     

Robust optimal stabilization of the Brockett integrator via a hybrid feedback

The problem of semi-global minimal time robust stabilization of the Brockett integrator (also called Heisenberg system) is addressed and solved by means of a hybrid state feedback law. It is shown that the solutions of the closed-loop system converge to the origin, in quasi-minimal time (for a given bound on the controller), with a robustness property with respect to small measurement noises, external disturbances and actuator noises.     

洪家渡水电站工程地质评价

洪家渡水电站选址在喀斯特峡谷区，通过精心勘测、分析并利用客观存在的工程地质条件，为设计与施工提供了翔实的工程地质资料和优化建议。     

多组多滞后区间系数时变非线性关联控制系统的结构与关联鲁棒镇定（Ⅰ）

建立了多组多滞后区间系数时变非线性控制系统的结构概念，采用刘永清建立的鲁棒镇定的等价法，给出了具有扰动结构参数的多组多滞后区间系数时变非线性关联控制系统的结构与关联鲁棒镇定，同时给出了扰动参数与滞后非线性项界限的估计公式     

自然γ能谱测井仪

本文介绍在石油测井中利用碘化钠探头测量地层自然放射性物质U、Th和K含量的仪器。测量精度:U、Th测量误差不大于1.5ppm,K测量误差不大于0.5％。现正用于石油测井现场。     

泡沫桥堵钻井液在吉林油田海31井的应用

海31井是吉林油田松辽盆地南部中央坳陷区红岗阶地海坨构造上的一口探井,设计井深为1885 m.该地区下部地层裂缝发育,存在大段不稳定暗色泥岩,在勘探开发过程中经常发生严重井漏和井壁坍塌事故,造成部分探井被迫提前完钻.海31井采取以防为主、防堵结合的堵漏原则.为了稳定井壁,在三开井段采用了抑制性泡沫桥堵钻井液.现场应用表明,抑制性泡沫桥堵钻井液具有良好的抑制性及封堵作用,性能稳定,未出现井壁剥落掉块和垮塌等井下复杂情况,有效地解决了该地区钻深探井严重漏失的问题,满足了该地区钻井施工要求.依据海31井抑制性泡沫桥堵钻井液应用情况及测井解释,较合理的钻井液密度应为1.07～1.22 g/cm3,但考虑到该地区的诱导性裂缝比较发育,应尝试采用低基浆密度(1.08～1.12 g/cm3)、低泡沫钻井液密度(0.80～0.90 g/cm3)的方法解决尚存在的漏失问题.