A high-torque self-balancing low-speed turbodrill

Abstract

The invention relates to a big-torque self-balance low-speed turbine drilling tool used for unconventional compact rock stratum drilling operation, and meets the technical requirements of the unconventional compact rock stratum drilling operation. The big-torque self-balance low-speed turbine drilling tool has the technical characteristics that an inner turbine blade is subjected to combined sheathing on a central spindle excircle upper step shaft, and a nut is in screw thread connection with the upper end of the central spindle; an outer turbine blade is arranged in the inner cavity of an inner barrel in a combined way; the upper end of the inner barrel and the lower end of an upper bearing pedestal are in the screw thread connection; the lower end of the inner barrel and the upper end of a lower bearing pedestal are in the screw thread connection; the upper end of a transmission shaft and the lower end of the central shaft are in the screw thread connection; the lower end of the transmission shaft and the upper end of an inner drill are in the screw thread connection; the upper end of a transmission barrel and the lower end of the lower bearing pedestal are in the screw thread connection; the lower end of the transmission barrel and the upper end of an outer driller are in the screw thread connection; three gear shafts are respectively installed in three through holes in the middle of the transmission barrel; three speed-regulation gears are respectively installed on three gear shafts. According to the big-torque self-balance low-speed turbine drilling tool, the inner driller and the outer driller relatively oppositely cut a rock stratum, the rock breaking torque of both parties can be automatically balanced, the absolute drilling speeds of the inner driller and the outer driller are lowered, and an output torque is increased.

Description

technical field [0001] The invention relates to a high-torque self-balancing low-speed turbo drilling tool for unconventional tight rock formation drilling operations. Background technique [0002] As the contradiction between the ever-increasing world energy demand and the depletion of existing traditional resources has intensified, the country's demand for unconventional oil and gas resources has also become increasingly urgent. Compared with traditional oil and gas resources, the types and occurrence forms of unconventional oil and gas resources are more diverse, the distribution is wider, and the potential resources are much larger than conventional oil and gas resources. Unconventional oil and gas reservoirs have poor physical properties, low porosity and permeability, especially unconventional tight rock formations with high hardness, high strength and poor drillability. At present, the mainstream downhole drilling tools used at home and abroad are mainly screw drilli...

AI Technical Summary

Problems solved by technology

[0003] However, the current conventional turbodrill also has its own limitations. The output drilling speed of the turbodrill is too high, and the output torque is very small, resulting in low drilling efficiency. Therefore, it is very important to match the drilling speed and torque of the turbodrill.

At the same time, the current downhole dynamic drilling tools all have a common defect, that is, while the drilling torque is output, the drilling tool shell will also bear the corresponding counter torque, and the counter torque directly acts on the upper drill string through the drill tool shell, directly causing the drill The column is twisted and deformed, especially during the deflection process, the counter torque often causes the drilling tool face to deviate at a certain angle, which makes it very difficult to align the drilling tool face, greatly increases the difficulty of deflection build-up, and prolongs the drilling operation time. cause a certain degree of economic loss

[0004] Based on the above technical background, the present invention provides a high-torque self-balancing low-speed turbodrill, which ensures that the turbodrill outputs a reasonable drilling speed and torque, and overcomes the defect that the casing of the traditional turbodrill is subjected to the reaction torque.

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