It can lead to not only quick wear and early failure of drill pipe but also the decrease of collapse resistance and burst resistance of casing string, which could cause casing collapse, casing deformation and casing leak, even well bore abandonment.
在深井、超深井、大斜度井、大位移井及水平井中，钻井时间延长、钻柱作用在套管上的侧向力增高，因此套管和钻柱的摩擦与磨损问题越来越突出。
The cement is displaced to the bottom of the casing and out the bottom of the oil well string.
水泥被排至套管底部并排出油井管柱的底部。
If the time exceeds 5 min, reciprocate the casing string, and the amplitude should not be less than two times of the length the casing string stretch.
4.4.6下套管过程中，应缩短静止时间，如套管静止时间超过5min，应活动套管，套管活动距离应不小于套管柱伸縮量的两倍。
The casing string used in a directional well in Daqing Oilfield is analyzed.
提高固井质量的措施中，上提、下放和旋转套管柱是最有效的方法之一。
Rotation cementing is one of the most advanced technologies in the world which is to make casing string rotate through turntable in order to improve displacement efficiency and cementing quality.
旋转固井是目前国际上最先进的固井新工艺之一，在固井施工中，通过转盘带动套管串旋转，提高水泥浆的顶替效率，提高固井质量。
Development projects: In order to meet the country's economic policy adjustments, since 1992, the Senate into the highway, municipal and water conservancy projects such as construction, to undertake a variety of templates, hanging me, caissons, hanging column, casing, Steel cofferdam, string, bits of metal structures and related documents, particularly for environmentally friendly products Shuajiao by national patent products, in the footwear industry has won praises from users.
为适应国家经济政策的调整，自一九九二年以来，不断参入公路、市政及水利等工程项目的建设，承接了各类钢模板、吊箱、沉箱、吊栏、护筒、钢围堰、管柱、钻头及相关的金属结构件，特别是环保产品刷胶机获国家专利产品，在制鞋行业赢得了用户的赞誉。
There are very heavy axial tension and compression in the casing under the deep well and large displacement well, the paper analyzed the weakest threads joint of the casing string by the plasticity contact finite element method, and studied the stress of the API 8 round casing under tensile load, the regular pattern of load and stress distribution along the axial casing threads has been given.
针对深井和大位移井中套管存在很大的轴向拉伸和压缩载荷的情况，采用弹塑性接触有限元方法对套管柱中最薄弱的螺纹接头部分进行分析计算，分析API8牙圆螺纹套管接头在拉伸载荷作用下的应力情况，给出了负荷和各应力沿轴向的分布规律。
According to mechanical analysis of subsea wellhead for deepwater drilling, a comprehensive stability analysis method is established. The marine environmental loading, drilling vessel or platform drifting, riser mechanical behavior, nonlinear behavior between casing string and formations are considered. Case analysis shows, the lateral displacement and bending moment of wellhead increases along with riser top tension ratios and current velocities.
根据深水钻井水下井口系统整体受力分析，建立了井口力学稳定性分析方法，该方法综合考虑了海洋环境载荷、钻井船或平台漂移、隔水管力学性能、套管柱与地层之间的非线性响应等因素的影响，可以实现井口力学性能分析。
There are too many random probable factors affecting the choice of safety factor s in casing string design.
在套管柱强度设计中，影响安全系数的因素很多。
E Array and number the casing joints strictly in the running order based on the casing string design.
e 严格按套管柱设计排列下井顺序并编号，编写下井套管记录，备用套管和不合格套管做出明显标记，与下井套管分开排放。
In combination with the geological features of the ga wells in West Sichuan, such as multi-payzone high pressure gradients and a large lithological change in channel sand bodies, etc., the casing cementing and perforation completion were adopted for the main well and branch holes in the well group and the interzonal pressure seals of the main well and branch holes, and the separate well fracturing and producing were all realized through a completion string with dual-tubing and dual-packer.
结合川西地区气井多产层、高压力梯度、河道砂体岩性变化大等地质特点，该井组主井眼和分支井眼均采用套管固井、射孔完成，通过双油管和双封隔器的完井管柱实现了主井眼和分支井眼的层间压力分隔和分井压裂、分井采气。
The bigger the effective eccentricity, the higher the upper drill string's lifting force, the higher the positive pressure on casing/drill string, and the more serious the wear.
有效偏心距越大，上部提升力越大，套管／钻柱之间的正压力将越大，磨损将越产重。
A numerical method was adopted to solve this model. The analyses on lateral displacement, angular distortion, bending moment, shear force and soil force acted on casing string show that the affection of lateral load is focus on the upper section of casing string, and the vertical load has little effect on the lateral loading capacity of casing string. When the casing string reaches a certain depth, its lateral loading capacity has little change with the depth, but the type of soil has a certain effect on lateral loading capacity of casing string. It is necessary for deepwater drilling to analyse the geological data in shallow formation and mechanical stability of wellhead.
通过对模型进行数值求解，对不同影响因素下沿管柱的横向位移、转角、弯矩、剪力和地基反力进行了分析，结果表明：载荷对管柱的作用集中在管柱上部较短的一段区域；竖向载荷对管柱横向承载力影响不大；套管下入深度超过一定值后，较大的下入深度对其横向承载能力几乎没有影响；海底浅部地层地基类型对管柱的横向承载能力有一定影响；有必要通过现场取样获得浅部地层的地质资料，对深水钻井井口力学稳定性进行分析。
The mechanics in the process of casing drilling were analyzed using the CAE stimulation and tests of fatigue reliability, including the force acted on the casing with different diameter-thickness ratio, residual intensity of worn casing, vibration modal and fatigue reliability of the casing string.
摘要利用CAE仿真技术和可靠性疲劳实验方法，研究了套管钻井中的有关力学问题。
A main problem about calculation of axial stress in the casing anticollapse design using tri - axial stress strength theory in the new standard of design method for casing string strength was discussed.
重点讨论了我国套管柱强度设计方法新标准中存在的一个主要问题，即三轴抗挤强度设计中轴向应力计算问题。
The annulus clearance between casing string and borehole in the constraint of surge pressure and formation fracture pressure is studied.
利用一维不稳定流动的基本方程，对套管与井眼环空间隙不同时的波动压力进行了计算，绘出了环空间隙与最大井底波动压力之间的关系曲线。
Applicable for hanging the casing string, sealing the annular space between the casings. Structure: integral or multi layers.
用来固定井口、悬挂井下管柱、密封和控制管柱间的环形空间，结构形式：分体式或整体式。
In consideration of the problems of pump off and direct circulation of backflow fluid containing sands in setting sand washing casing string its operation, a technique for high efficient and environmental protection sand-washing operation is proposed.
针对目前油田冲砂作业过程中下放冲砂管柱时需停泵作业及冲返的含砂液体直接循环使用所存在的问题，提出了高效环保冲砂作业工艺。
Transferring the pressure differential of the fluid column between the casing string and tubing string to the power for the downward moving of the rod string by using the hydraulic feedback technique;
采用液力反馈技术，将油、套管之间的液柱压差转化为抽油杆柱的下行动力；
The free segment length of deep oil well casing string gives an important influence to the quality and cost of the oil well cementing operation.
深井套管柱悬空段的长度直接关系到固井的质量和成本，是我国深井油田急需解决的问题之一。