供水机井成井工艺质量问题分析

近年来国家对安全饮水、节水曾粮、高效农业建设项目高度重视,为保证工程建设项目的水源问题,供水机井建设项目发展迅速,随之而带来的成井工艺质量问题普遍发生,成井后用不了多长时间就出现：塌井、埋泵、水量不足或递减以及废井等问题,使投入的大量供水水源建设基金没有发挥应有的效益,对供水机井质量问题进行分析,以提高与完善成井的工艺质量与水平。     

砂砾含水层成井工艺的反冲淘沙法

当前在砂砾含水层的成井工艺中,均采用常规程序。即在所设计的砂砾含水层部位,配置相应的滤管,滤管外仍采用缠丝,再包扎尼龙滤网。管外投填滤砂。用活塞提拉或空压抽水洗井。此为传统工艺。由于受传统工艺束缚,缺乏对砂砾含水层结构的具体分析。施工工艺的针对性、对策性欠妥。多数成井井阻大,产水效率低。笔者在施工中,改变传统理念。提出反冲淘砂法成井。取得极为理想的效果,且施工工艺简单,井阻系数小,绝大部分为超完善井,产水效果佳。可视作砂砾含水层成井之新工艺。     

深层地热井施工成井工艺

温州地热井是该地区最深的一眼地热井,也是在火山岩地区打出的第一眼深层地热井。本文针对火山岩地区的施工成井工艺提供了借鉴和参考。     

细粉砂层水源井成井工艺的探讨

对细粉砂层水源井成井工艺中的滤料投填标准、孔中泥浆清除方法措施进行了深入研究,并通过井群施工试验及相应的水文地质测试,获取了较成功的结果,并在其后的施工实践中取得了成熟的经验和应用效果,具有推广应用价值。     

打井成井工艺及孔内事故的预防与处理

在我区广大农村、牧区,以每年抗旱打井来解决灌溉农田和解决人畜饮水问题.但是开发利用单位和施工单位都忽略了一个问题就是打井过程中的成井工艺和孔内事故的预防与处理方面都存在很大问题.从而造成水源工程的质量问题,成井难,寿命短,浪费资金等事情普遍存在.本文就预防和控制这些问题谈了观点.     

浅谈饮水安全工程中深管井成井质量的四大关键

临颍县农村饮水安全工程供水水源目前全部依赖开采中深层地下水,因此中深机井建设成井质量已成为饮水安全工程建设的重要一环.通过近两年饮水工程中的机井建设实践,针对施工中的钻孔、下管、填砾、洗井4个重要环节的施工措施和注意事项等方面进行了探讨.     

农田打井成井工艺及孔内事故的预防与处理

在我国的很多地区,农田灌溉问题一直都是人们非常关心的一个问题,而由于气候方面的原因,很多地区都会选择打井来对灌溉问题予以有效的改善和解决,但是有些施工单位在打井的过程中对打井的施工工艺和流程以及孔内的事故预防比较不重视,所以在这一环节中也存在着一些质量上和安全上的隐患,这样也使得成井的质量差,同时使用寿命也比较短,严重影响了工程的正常使用,本文主要分析了农田打井成井工艺及孔内事故的预防与处理,以供参考和借鉴。     

大水沟冲洪积扇细土平原区含水层(组)划分及成井工艺探讨

格尔木市大格勒乡大水沟冲洪积扇沉积了巨厚的第四系松散沉积物,在细土平原区形成由南向北倾斜的多层承压自流水含水层,水量相对丰富,水质较佳,具备了开发的有利自然条件。本文根据水质条件,将本区300m以浅的层状含水层自上而下分为5个含水层,井对开采的成井条件、成井工艺进行了探讨。     

浅谈大空孔掏槽一次成井机理研究及应用

结合大空孔掏槽破岩机理,运用矿山新设备中深孔凿岩台车全深度一次钻孔,一次爆破成功形成切割天井。论述了整个爆破工艺,包括凿岩设备,掏槽方式、装药结构、起爆顺序等的选取。中深孔爆破一次成井的成功施工,降低了工人劳动强度,提高了生产工效和安全性。     

立井深孔掏槽爆破一次成井的应用研究

在立井掘进中,掏槽孔的爆破效果在很大程度上决定着其它炮孔的爆破效果,深孔爆破一次成井掏槽试验使用双空孔来取代大直径空孔,作为首响掏槽的补偿空间,第一响掏槽眼和空孔之间的垂直间距为0.20m,第二、三响掏槽眼和空腔的间距为0.3m。使用规格为￠65mm,长20mm的卷药,每卷炸药的重量为0.6kg。因此线装药密度调整为3kg/m。选择延时间隔100 ms。提供了可靠的理论依据。     

钻孔灌注桩的施工质量控制

文章从钻孔前、钻孔过程中、成孔后、浇筑前和浇筑过程等成桩过程的主要环节介绍钻孔灌注桩的质量控制方法以及故障的排除等。     

Vibration suppression and output constraint of a variable length drilling riser system

In this paper, we mainly concentrate on the control issue of a variable length drilling riser under condition of unknown disturbances and output constraint. The studied flexible drilling riser system with variable length, variable tension, variable speed and restricted boundary output is essentially a nonlinear distributed parameter system. For achieving the vibration suppression and ensuring the boundary output within the constrained range, an appropriate control scheme with output signal barrier is put forward by integrating boundary control method, barrier Lyapunov function with finite-dimensional backstepping technique, where disturbance observer is employed for coping with the boundary disturbance. Moreover, the Lyapunov’s synthetic method is applied for the steadiness research of the studied flexible drilling riser system, and the simulations are presented to display the usefulness of proposed control scheme.     

石油钻井现场安全管理系统设计与实现

随着现代信息技术的迅猛发展,IT技术越来越多的普及到各个领域,HSE管理体系的日益完善需要强大的技术支撑。本文从石油钻探井队现场安全管理出发,结合当今钻井队的安全管理主要问题,设计了基于HSE的现场安全管理系统。     

Investigation of a novel perforation technique in petroleum wells—perforation by drilling

The objective of perforating the petroleum wells is to maximize well productivity. A good connectivity between the wellbore and formation can lead up to achieve that goal. However, the conventional method of perforation, which basically involves the use of explosive charges, rarely meets the expected well productivity. It is mainly because of the formation of a region of reduced permeability around the perforation tunnel. To offset such and several other shortcomings of present practices, a new technique is required, the highlight of this paper. Described as the ‘perforation by drilling’ (PD), this new technique is examined and compared for its performance with that of another technique, ‘Perforation by Shooting’ (PS). For this, the experimental and numerical results of the PS technique on cylindrical sand samples of varying amounts of strength and porosity are studied. Moreover, in order to achieve a so-called ‘perfect perforation’, results are compared with the ‘Casting technique’. Three different samples were selected for the measurement of fluid flow rate and differential pressure across the perforation using a ‘geotechnical digital system’ (GDS), which is a triaxial testing device. Profiles such as fluid flow rate with a change in differential pressure and pressure build-up data with time, signify that the PD technique can achieve maximum wellbore productivity when compared to the PS technique. Results also indicate that at a 100 kPa differential pressure, the PS, PD and Casting techniques can achieve 0.20, 0.65 and 1.00 mL/s fluid flow rates respectively across a sample. The paper also implements a 1-D time dependent porous media flow model to simulate flow across the perforated cylindrical samples created by the PS, PD and Casting techniques. Results show a good consistency between the experimental and numerical approaches.