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What are the precautions for using drill collars during drilling?
release time：2024-06-19
source： network
The precautions for using drill collars during drilling mainly include the following aspects:
1. Preparation before using new drill collars:
✮ Clean the old thread grease to ensure that the thread and shoulder surface are not damaged and the phosphating layer is intact.
✮ Re evenly apply thread grease that meets the requirements of SY/T 5198-1996 "Drilling Tool Thread Greases". It is recommended to use standard thread grease with a relative friction coefficient of 0.08. Other thread greases with different friction coefficients can also be selected according to on-site conditions, and the tightening torque can be recalculated.
2. Tightening torque of drill collar:
✮ Each drill collar must be tightened according to the specified torque, and the specific tightening value can refer to API RP 7G "Recommended Practice for Drill String Design and Operating Limits".
3. Lifting and transportation of drill collars:
✮ During lifting and transportation, the male and female buckles must be protected with protective wire to prevent damage.
4. Fixation and installation of drill collars:
✮ When using on the ship, it is necessary to choose a suitable anchorage and prepare drilling collars and related equipment, such as anchors, steel cables, and winches.
✮ Choose appropriate fixing methods, such as single anchoring, double anchoring, or three-point anchoring, to ensure stable fixation of the vessel.
✮ When installing and disassembling drill collars, it is necessary to ensure that the working platform is stable, use high-quality steel wire ropes and lifting equipment for operation, and ensure that all components are correctly and firmly connected to each other.
5. Use of drilling fluid:
✮ Ensure that the drilling fluid is clean and regularly inspect and maintain the filtration equipment to avoid damage to the drilling tool components.
✮ Adjust the performance of the drilling fluid to ensure its correct use, in order to ensure the cooling and cleaning functions of the drilling tool.
6. Operation of wellhead equipment:
✮ When starting the next section, it is advisable to use a slow descent to avoid impact and damage caused by excessive speed.
✮ Pay attention to the cleaning work of the wellhead, prevent various debris from entering the well, and maintain the drilling tools and fixtures suspended at the wellhead.
7. Regular inspection and maintenance of drill collars:
✮ Regularly inspect the wear of drill collars and drill bits, and replace them in a timely manner according to the degree of wear.
✮ Before use, conduct a quality inspection on the drill bit to ensure that its structure is intact and the number of blades is consistent.
✮ During the use of drill pipes, attention should be paid to preventing excessive wear and breakage, and damaged drill pipes should be replaced in a timely manner.
8. Safe operation:
✮ Operators should be familiar with the operating procedures and safety regulations of relevant drilling equipment.
✮ Backbone operators should receive regular training to improve their operational skills and safety awareness.
9. Handling of abnormal situations:
✮ During the operation of the drilling tool, abnormal situations such as vibration, impact, abnormal sound, and decreased drilling speed should be recorded at any time.
✮ Timely report abnormal situations to senior engineers or superiors in order to take timely measures to solve problems.
By following the above precautions, it is possible to ensure the safe and efficient use of drill collars during the drilling process.
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