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14934 results about "Drill hole" patented technology

Bi-centered drill bit having improved drilling stability mud hydraulics and resistance to cutter damage

A bi-center drill bit includes pilot and reaming blades affixed to a body at azimuthally spaced locations. The blades have PDC cutters attached at selected positions. In one aspect, the pilot blades form a section having length along the bit axis less than about 80 percent of a diameter of the section. In another aspect, selected pilot blades and corresponding reaming blades are formed into single spiral structures. In another aspect, shapes and positions of the blades and inserts are selected so that lateral forces exerted by the reaming and the pilot sections are balanced as a single structure. Lateral forces are preferably balanced to within 10 percent of the total axial force on the bit. In another aspect, the center of mass of the bit is located less than about 2.5 percent of the diameter of the bit from the axis of rotation. In another aspect, jets are disposed in the reaming section oriented so that their axes are within about 30 degrees of normal to the axis of the bit. In another aspect, the reaming blades are shaped to conform to the radially least extensive, from the longitudinal axis, of a pass-through circle or a drill circle, so the cutters on the reaming blades drill at the drill diameter, without contact to the cutters on the reaming blades when the bit passes through an opening having about the pass-through diameter.

Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique

ActiveCN101403314ALess gushEliminate disastersFluid removalGas removalDischarge efficiencyInjection pressure
The invention relates to a hydraulic fracturing anti-reflection technology for pumping and exploring gas by drilling a hole in a coal mine well, comprising the following steps sequentially: (1) selecting a fracturing location; (2) determining the pressure type according to observed coal type, laneway arrangement and construction development degree, and ways of top soleplate bedding plane borehole hydraulic fracturing, top soleplate translamellar borehole hydraulic fracturing, the coal bed bedding plane borehole hydraulic fracturing or the coal bed translamellar borehole hydraulic fracturing can be adopted; (3) determining borehole parameters for constructing drilling, wherein, the borehole parameters include borehole length, borehole height, aperture, obliquity angle and azimuth angle; (4) designing the hydraulic fracturing, including injected water volume and injection pressure; (5) borehole washing; (6) draining; (7) examining the fracturing effect, if the fracturing effect is in accordance with the requirement, the following step is carried out, if not, turning to step (4); and (8) entering a pipeline for pumping and discharging. The technology enhances the air permeability of the coal bed, reduces the gas emission rate of an excavation working face, and obviously promotes the pumping and exploring capability and the pumping and exploring effect of the single borehole. The pumping and discharging efficiency is improved, the pumping and discharging time is shortened and the damage of the gas is maximally eliminated.

In-hole drilling tool integrating drilling, slotting and punching coal seam and using method thereof

The invention discloses an in-hole drilling tool integrating drilling, slotting and punching a coal seam and a using method thereof. The in-hole drilling tool comprises a water supple device or an air supple device, a high-pressure sealing drill pipe, a slotting and punching valve and a drill bit. The water supply device and the air supply device are connected with the high-pressure sealing drill pipe at an orifice. The slotting and punching valve is installed between the high-pressure sealing drill pipe and the drill bit. The in-hole drilling tool is essentially used for drilling and anti-reflective outburst eliminating after drilling of soft outburst coal seam. The using method is as follows: after the drilling construction is finished, a water supplier with a pressure release valve is used for starting a high-pressure pumping station to improve the pressure and the flux for water supply; high-pressure water current at the pumping station drives the slotting and punching valve to act for closing an axial liquid passage and opening a radial liquid passage; and high-pressure jet current realizes slotting or punching through a cutting nozzle or a punching nozzle. The invention has novel design and easy operation, is safe and reliable, improves the outburst elimination efficiency and realizes the integrated operation of drilling, slotting or punching and outburst eliminating.
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