ZJ30自紧绷绳钻机的研制

在XJ550自紧绷绳修井机的基础上,对ZJ30钻机进行了自紧绷绳创新设计。取消了传统的4根防风载绷绳设计,其风载绷绳固定在井架基础及折叠钻台绷绳支座上、内负荷绷绳固定在车架上、二层台交叉绷绳固定在折叠钻台绷绳支座上。主要优点是不再需要设置锚坑锚桩,因而占用的作业区域小,实现了钻井作业环保、安全、快捷、高效的目标。

ZJ40CZ/K直立无绷绳4000m车装钻机的研制

为了满足丛林、山地、丘陵、沙漠等特殊地区油气开发的需要,设计了直立无绷绳车装钻机。该钻机吸收了国外先进技术和传统车装、橇装钻机的经验,具备优良的技术性能。与传统的车装钻机相比有以下区别:(1)所使用的运载车不同,传统车装钻机使用的是14×8运载车,该钻机使用的是8×8运载车;(2)所使用的井架不同;(3)传统车装钻机使用的是独立钻台,而该钻机使用的是模块结构。实验表明,该钻机除满足4000m钻井的生产要求外,还具有其他钻机所不能达到的工作可靠性,性能稳定性以及复杂路况下的移运灵活性。

MECHANICAL ANALYSIS OF TREE SPARS IN CABLE YARDING SYSTEMS

Tree spars,as appropriate supports for cable yarding systems,have to beverified for the strength before any real operation.This paper gives theoretical analysisfor various cases.Tree spars without guylines are normally under heavy bending stress,which dominates the strength design.For tree spars equipped with guylines,the spardeflection follows the same way as an unguyed spar.The overload of the bending stressremains the main reason of spar failures.Several diversities of tree spars from theidealized condition are investigated for the sake of better modeling of the real situation.Analysis supports that the tree spar can generally be treated as a straight cylindricalcolumn without giving significant errors.The load can be handled as centrically applied.Design methods are provided for both guyed and unguyed tree spars,which will benefit thepractice of using tree spars as an alternative for steel spars.