钻铤

钻铤在地层中产生的实部信号可近似认为恒定，而当地层电导率大于0.01S/m时，钻铤在地层中产生的虚部信号亦可近似认为恒定。

The real-part signal produced by the drill collar in the earth can be approximately regarded as constant , and the imaginary part can also be approximately regarded as constant when the conductivity of the earth is greater than 0.01S/m .

φ203mm4145H钻铤热处理裂纹分析

Analysis of Crack Causes on the φ 203 mm 4145H Drill Collar after Heat-treatment

同时，采用钟摆组合钻具与纯钻铤组合钻具吊打纠斜，以控制井身质量。NET裁剪与定制。

At the same time , pendulum assembly and net drilling collar assembly are employed to control the drilling quality and prevent deviation .

4145H钢钻铤焊接接头强韧性研究

Study on the Strength and Toughness of Drill Collar Weldment of 4145H Steel

研究了4145H钢钻铤焊接接头的组织和性能。

The microstructures and properties of the weldments of drill collars made of 4145H steel were investigated .

为了更好的构造钻铤及线圈结构，本文采用三维圆柱坐标系FDTD来研究随钻电磁波测井仪器，并且在r方向上采用非均匀网格来减少内存需求。

According to the mandrel and coil geometries , FDTD in a three-dimensional cylindrical grid is chosen to research the response of electromagnetic logging while drilling tools . The cell size in radial p direction is non-uniform to lower the requirement of memory .

158.8mm钻铤裂纹原因分析

Analysis of the Causes of the Crack in the 158.8mm Drill Collar

经现场应用，指出井斜大于30°的井，封隔器以上应加钻铤；三联作时下放管柱速度应小于0.4m／s。

By field application , it is indicated that drill collars are put on the packer when deviation of the well is more than 30 ° and down speed is lees than 0.4 m / s if tri-combination applied .

钻铤螺纹早期破坏的研究

A Study on Early Damages of the Threads of Drill Collars

钻铤螺纹联接载荷分布规律与疲劳失效

Mechanism and Prevention of Fatigue Failure for Drilling Collar Thread Linking

钻铤螺纹联接处载荷分布规律研究

A study on load distribution at a drill collar threaded connection

钻铤套管和钻杆压力矫直机的设计

Design of the straightening machine for collars casings and drill pipes

确保石油钻铤螺纹联接强度的使用措施

The practical measures to insure the strength of collar connection thread

中碳空冷贝氏体钢在石油钻铤上的应用

The use of Air Cooled Bainitic Steel in drill collars

新型石油钻铤联接螺纹减应力区的研究

Research on a new stress relief groove of drill collar threaded connections

深井中钻铤螺纹联接的强度研究

Strength Analysis of Drill Collar Connection in Deep Well Drilling

钻铤螺纹疲劳裂纹的超声波检测

Using ultrasonic to inspect endurance crack in collar thread

高强度钻铤螺纹的研制及应用

Development and application of high-strength drill collar threaded connection

这是钻杆丝扣油，不能用在钻铤丝扣上。

This is the dope for drill pipe thread .

钻铤的超声波探伤声表面波马达

ULTRASONIC INSPECTION OF DRILL COLLARS Surface Acoustic Wave Motor

钻铤断裂失效分析

Failure analysis on the fracture of the drilling collar

钻铤螺纹应力分析及结构优化

Stress Analysis and Structure Optimization of Drill Collar Threads

有限元法在钻铤螺纹结构优化中的应用

Application of finite element method in the structure optimization of drill collar thread

震击作用时钻铤上动载荷的有限元分析

Dynamic load analysis of the drill collar during jarring operations by the FEM

试验的监查；钻铤的超声波探伤

Monitoring the trial ; ULTRASONIC INSPECTION OF DRILL COLLARS

钻铤的超声波探伤

Ultrasonic inspection of drill collars wave form gate

石油钻铤螺纹联接失效的机理分析

The Failure Mechanism Analysis for Collar Connection Thread

钻铤螺纹质量可靠性探讨

Exploration on Qualitative Reliability of Drill Collar Screw

AISI4145H钻铤用钢的研制

Development of Steel for Drill Collar AISI 4145H

需要一根短钻铤。

We need a short drill collar .