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- Title
铝合金钻杆在长水平井段延伸钻进的可行性.
- Authors
祝效华; 李 柯
- Abstract
At present, the key research on shale gas well drilling in China targets the long horizontal wells with vertical depth over 4 000 m. Long horizontal drill string requires the drill pipe to transmit greater axial force to resist the friction along the string. And the adoption of light aluminum alloy drill pipe is a revolutionary technology of extended drilling with greater implementation feasibility, but its friction torque characteristics, weight on bit (WOB) transfer laws, buckling characteristics, safety & reliability and other problems have not been studied systematically. In this regard, a dynamic model of multi-dimension aluminum alloy drill string according to the principle of Hamilton was established. Then, the model was solved using the HHT-α method. Finally, the contact friction, WOB transfer laws and influencing factors of aluminum alloy drilling tools were compared with those of steel drilling tools. And the following research results were obtained. First, the pressure loss of the aluminum alloy drill pipe is obviously lower than that of steel drill pipe. Second, aluminum alloy is softer, so small-sized aluminum alloy drill pipe is prone to buckling in the process of drilling, which leads to the reduction of WOB transfer efficiency and even the occurrence of "self-locking drill pipe" phenomenon. Third, the large-sized aluminum alloy drill pipe is smaller in buckling deformation and it is superior to the small-sized aluminum alloy drill pipe in terms of friction drag reduction effect. The friction drag of the OD 147 mm aluminum alloy drill pipe is only 71.9% that of the OD 129 mm aluminum alloy drill pipe. In conclusion, the rigidity of small-sized aluminum alloy drill pipes cannot satisfy the strict drilling conditions of shale gas wells with long horizontal sections, and large-sized aluminum alloy drill pipes are one of the important prerequisites for solving the difficulty of extended drilling.
- Subjects
CHINA; GAS well drilling; DRILL pipe; ALUMINUM alloys; DRILL stem; LIGHT metal alloys; SHALE gas
- Publication
Natural Gas Industry, 2020, Vol 40, Issue 1, p88
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2020.01.012