Abstract
With the increasing intensity of oil and gas field exploration and development, oil and gas wells are also drilling into deeper and more complex formations. Conventional steel drilling tools can no longer meet the requirements of ultra-deep, high-temperature and high-pressure wells. The paper first analyzes the advantages of titanium alloy drill pipe based on basic performance of titanium alloy drill pipe. The experimental results show that the basic properties of titanium alloy drill pipes meet the operating standards of the petroleum industry. Then the buckling performance of titanium alloy drill pipe and steel drill pipe is compared, the calculation results show that the buckling performance of titanium alloy drill tools is slightly lower than that of steel drill tools. Secondly, the maximum allowable buildup rate of titanium alloy drill pipe and steel drill tool is studied. The research shows that under the same condition of the drill pipe outer diameter, titanium alloy drill pipe can be used for a smaller curvature radius and greater buildup rate. This advantage of titanium alloy drill pipe makes it more suitable for short radius and ultra-short radius wells. Finally, taking a shale gas horizontal well as an example, with the goal of reducing drill string friction and ensuring drill string stability, a comparative study on the application of titanium alloy drill pipe and steel drill pipe is carried out. The results show that titanium alloy drill pipe has a wider application in the field, and is suitable for operations under various complex working conditions.
Highlights
Oil and gas field development is faced with the dual pressures of enhancing oil recovery and improving quality and efficiency, and there are more and more complex wells
When using φ127mm S135 drill pipes in horizontal wells, the joint inner diameter is reduced from φ82.55 mm of G105 drill pipes to φ69.85 mm, due to the reduced torque, 80 ksi titanium alloy drill pipe can reach the strength of S135 steel grade at the same displacement [13]
Under the same wellbore diameter and inclination angle, the critical buckling load of titanium alloy drill pipe is lower than that of steel drill pipe, indicating that titanium alloy drill pipe is more prone to buckling than steel drill pipe under the same load
Summary
Oil and gas field development is faced with the dual pressures of enhancing oil recovery and improving quality and efficiency, and there are more and more complex wells. The density of titanium alloy is only 4.5 g/cm, and the floating weight of drill pipe with the same wall thickness and length in the horizontal section drilling fluid with a conventional density of 1.25 g/cm is only 49% of that of steel drill pipe [10]. When using φ127mm S135 drill pipes in horizontal wells, the joint inner diameter is reduced from φ82.55 mm of G105 drill pipes to φ69.85 mm, due to the reduced torque, 80 ksi titanium alloy drill pipe can reach the strength of S135 steel grade at the same displacement (because the floating weight is reduced by 51%, the torque will be reduced by 51%) [13]. Calculate the original cross-sectional area of the sample with the measured cross-sectional dimensions. The tensile testing machine of the State Key Laboratory of Southwest Petroleum University is shown in figure 1, and the tensile samples are shown in figure 2
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