42results about How to "Improved drilling stability" patented technology

The invention provides a three-hole one-time equilibrium drilling device for a solar mirror bracket. The three-hole one-time equilibrium drilling device comprises a rectangular base, two double-hole drilling units, two single-hole drilling units, one mirror bracket bearing unit and two axial limiting units. The three-hole one-time equilibrium drilling device provided by the invention is symmetrically arranged on the rectangular base by adopting the two double-hole drilling units and two single-hole drilling units, so that two sides are respectively subjected to symmetrical drilling, the two sides are in force balance, not only is the drilling efficiency high, but also higher drilling stability is obtained, and the drilling accuracy is ensured.

The invention relates to a three-stage one-stroke hydraulic pressurizer applied to drilling of conventional wells, slim holes and micro-holes. The technical scheme of the three-stage one-stroke hydraulic pressurizer is that an upper joint, different stages of piston cylinders and a lower joint are connected sequentially through threads; the lower end of the upper joint of the hydraulic pressurizer is connected with a third-stage piston cylinder through threads; the third-stage piston cylinder and a second-stage piston cylinder are connected with a main piston cylinder; a third-stage piston, a second-stage piston and a main piston are mounted in the corresponding cylinder bodies respectively; the main piston cylinder and a main piston rod are flexibly connected through a roller mounted on the cylinder body and a keyway formed in the piston rod; the upper end of the main piston rod is connected with the main piston through threads, and the lower end of the main piston rod is fixed on the lower joint through threads. With adoption of the hydraulic pressurizer, mud power is converted into axial thrust, so that constant bit pressure is applied to a drill bit, the bit pressure transfer efficiency can be increased, the problems of bit jumping, backing pressure and the like are solved effectively, the service life of the drill bit is prolonged, fatigue failures of a drilling tool are reduced, and drilling efficiency is increased.

The invention discloses an engineering driller comprising a power head, a driving drill rod, two feeding oil cylinders, a portal frame and a chuck for vertically fixing the driving drill rod opposite to a stand, wherein the driving drill rod vertically passes through a main shaft of the power head, the portal frame comprises a left vertical post and a right vertical post, and both sides of the power head are respectively clamped on the left vertical post and the right vertical post and are in single-freedom sliding fit with vertical posts at the corresponding side; and the two feeding oil cylinders are respectively fixed and arranged at the bottoms of the left vertical post and the right vertical post, piston rods of the feeding oil cylinders are vertically and upwards fixed with the power head below which the chuck is arranged, and the driving drill rod is clamped in the chuck. A power head support frame of the engineering driller adopts a portal vertical post structure, both sides of the power head are respectively clamped on the left vertical post and the right vertical post of the portal frame, the power head moves up and down through the feeding oil cylinders, the stroke can be about 1 meter, and therefore, the engineering driller has high precision of vertical movement; because the chuck is arranged below the power head, an operator can directly operate the engineering driller without climbing the driller; and the engineering driller has the advantages of safety, convenience and high efficiency.

An anti-destructive ground drilling gas drainage method belongs to the technical field of coal mine gas drainage methods, which can solve the problems that the ground vertical drilling is easily damaged due to the movement of the working face, and the construction of L-shaped drilling is difficult and costly. Before coal seam mining, Spud drilling from 3‑5 m outside the edge of the surface mobile basin, drill vertically downward to stop at 30‑50 m above the fractured zone, and then go down into a vertical rigid pipe; inwardly stagger the direction of 40‑60° return airway Deviation; the drilling section from the beginning of deflection to the junction of the upper boundary line of the collapse zone and the mining stress boundary line on the side of the return airway is run into the flexible casing, and the upper boundary line of the collapse zone and the mining stress boundary on the side of the return airway The flexible screen pipe is lowered into the drilling section from the junction of the line to the floor of the mining coal seam, and the surface wellhead is connected with the pumping station. The invention solves to a certain extent the problem of damage to surface drainage drilling caused by advancement of the working face, and greatly improves drilling stability.