A kind of anti-rock burst and anti-jamming gas drilling bit

Abstract

The invention provides an anti-rock burst and anti-jamming gas drilling bit, which relates to the technical field of oil and natural gas exploration. The anti-rockburst and anti-jamming gas drilling bit includes a threaded upper joint (1) and a drill body (6) installed on the threaded upper joint (1), and the drill body (6) is provided with a plurality of main blades (7 ), the bottom of which is also provided with a plurality of auxiliary blades (8), and the end of the main blade (7) away from the threaded upper joint (1) and the auxiliary blade (8) are provided with a plurality of PDC cutting teeth (9) , the end of the main blade (7) close to the threaded upper joint (1) is also provided with a plurality of undercut cutting teeth (3), and the side of the main blade (7) is provided with an arc-shaped blade slope (12) with a certain angle and Curved grooves (4) capable of natural scraping. The invention can ensure that the drill bit continuously grinds large rock blocks when encountering well wall rockburst or well wall collapse during the drilling process, and discharges cuttings to prevent drill sticking.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration, in particular to a gas drilling bit for preventing rock burst and sticking. Background technique [0002] The drill bit is an important tool that directly contacts the rock during the drilling operation and breaks the rock through cutting and impact. As the mining depth deepens, the ground temperature, formation pore pressure and ground stress increase, and the geological structure becomes more and more complex. There are more and more situations, and sudden well wall instability is one of the potential safety hazards. Borehole wall collapse is a condition of wellbore wall instability during drilling construction, which has a great impact on drilling engineering. Relevant data show that the world oil industry loses more than 600 million US dollars every year due to well wall instability. During the drilling construction process, there is a very complex and changeab...

AI Technical Summary

Problems solved by technology

The roller cone bit can effectively remove cuttings in conventional gas drilling, but it is difficult to remove a large number of high-speed cuttings produced by rockburst at the bottom of the well or wall collapse, and the patented roller cone bit has a nozzle aperture It is still equivalent to the inner hole diameter of conventional nozzles, but the overall inner hole is small, which is not conducive to the removal of large cuttings caused by rockburst and wall collapse. The large cuttings entering the inner hole of the cone cannot pass through the airflow of the small hole 3. Patent CN201520956036.7 discloses a device for producing rock cuttings for the first time of a gas drilling bit. The gas can enter from the gas injection port, flow through the flow channel, and flow out from the gas outlet to impact and cool the roller cone bit. And the cuttings are taken away from the bottom of the roller cone bit in time; the motor can provide kinetic energy for the rotation of the drill pipe, and the drill pipe drives the roller cone bit to rotate; the conical bottom surface can prevent the accumulation of large cuttings particles, and the separator can separate the gas and Particles of cuttings are separated

Turn on the motor, and lower the weight block through the winch, so that the rotating roller cone bit touches the rock block and begins to break the rock. Under the impact of the airflow, the broken rock leaves the bottom of the roller cone bit, moves with the airflow, and finally enters the separator for separation , so as to obtain the cuttings of the gas drilling bit for the first time, the structure is simple, the operation is convenient, the cuttings production efficiency is high, and the cuttings produced can meet the requirements of the experimental research. method, the roller cone bit used is still a gas bit used for conventional drilling, which cannot meet the requirements for dealing with downhole rockburst and well wall collapse accidents.

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