Complex Formation In The Deep Rope Take Heart Improvement Of The Drill Pipe And Drill

The paper aims at the problems such as string failure, tripping gear, female thread dehiscing, high pump pressure, congealing mud, the relatively low efficiency and so on, which exist in diamond wire-line coring drilling technology applied to the complex stratum of middle depth. Based on the condition of China such as specification and quality of pipe material, the precision of machine work, level of the heat treatment, status of the drilling equipments, operating altitude and so on, the paper will make some suitable technical proposal for our country in order to satisfy geologic drilling, improve drilling efficiency and the security of the application to the in-depth and complex stratum and reduce the cost and laboring intensity. First, we will ameliorate and optimize the most standing N (with the diameter of 75mm) drill pipe structure, screw thread tie-in's configuration and size of the buckle to improve their intensity and security. When we are doing the above work, we will search after new material for rod coupling and new more practical method of boosting up superficial resistance to wear and intensity, according to the fact, and improve the longevity of drill pipes. Secondly, through the above study and probe, it will optimize drill pipe configuration of the wire-line coring, gradation of drill utensil and process parameter further and improve the security, efficiency and infixing power in the depth of the wire-line coring drilling technology and complex stratum. As a result, the longevity of drill pipe tie-in is improved, can satisfy the need of 1500-to-2500-meter drill-hole depth, and generalizes the wire-line coring drilling technology.