35results about How to "Improve rock-carrying ability" patented technology

The invention discloses a hydraulic pulse drilling device with cavitation jet, which comprises a columnar body, wherein a fluid inlet section is provided at one end of the body, a fluid outlet sectionis provided at the other end of the body, and a fluid diversion portion for deviating the flow direction of the fluid, a pulse generator allowing the continuous fluid to generate pulse and a self-oscillation portion for allowing the fluid with pulse to generate resonance oscillation are sequentially provided between the fluid inlet section and fluid outlet section. The invention also discloses aself-resonating cavitation jet nozzle for drilling head, which improves the rock breaking effect of drilling head and rock cleaning effect at well bottom. The invention also discloses a hydraulic pulse drilling method with cavitation jet, which comprises during drilling work, converting continuous and stable fluid flow for impacting well bottom to pulse resonance flowing fluid; and injecting the pulse resonance flowing fluid into relatively static fluid to generate cavitation phenomena. The impact of well bottom with oscillating pressure reduces clip hold down effect, improves the rock cleaning and rock breaking capacity by jetting, and saves drilling cost.

The invention discloses an auxiliary cutting carrying tool for coal seam gas extraction gas-filled underbalanced drilling of multilateral wells, and belongs to the field of petroleum, natural gas and geologic drilling. The cutting carrying tool comprises an integrally formed body, a shoulder, a transition diversion slope surface, a middle neck, an inlet diversion slope surface, a spiral migration structure, an outlet diversion slope surface and a joint, wherein the spiral migration structure is arranged at the middle neck. Spiral turbulent strong cyclone flow can be generated by the aid of the spiral migration structure, kinetic energy of liquid-based circulating medium cyclone flow is enhanced in a coal seam gas extraction multilateral well section annulus, and the cutting carrying capacity of the coal seam gas extraction multilateral well section annulus is improved. Rock fragment pellets moving upward in the annulus can be crushed into small rock fragment particles by the aid of an arc-shaped spiral prism, erosive wear of the surface of a drill rod caused by large-particle rock fragments is decreased, the service life of the drill rod is prolonged, the migration performance of the rock fragments in the annulus can be improved by the aid of an arc-shaped spiral groove, and damage to a coal reservoir is reduced.

The invention provides a well cleaning functional type drill pipe. A pipe body is connected with an internal threaded joint and an external threaded joint in a welded mode, and welding seams are formed at the welding position of the pipe body and the internal threaded joint as well as the external threaded joint; a thickening section is arranged in the middle position of the pipe body, conical segments are machined at the two ends where the thickening section intersects with the pipe body, and the middle of the thickening section is a cylindrical segment; and an internal thread and an externalthread which are mutually cooperated are machined on the internal threaded joint and the external threaded joint correspondingly. The well cleaning functional type drill pipe has the advantages thatdrilling fluid is automatically disturbed by the drill pipe, so that the flow regime of the drilling fluid is changed, and the cuttings carrying ability of the drilling fluid is improved; due to disturbance of the drill pipe, cuttings deposited at the bottom of a well is disturbed, the drilling fluid entering into the turbulent flow state is brought out of the well, and the well cleaning effect isachieved; and the problems of sand setting, friction, backing pressure and the like of a drill column in the drilling process are effectively solved, and short tripping of the drill column, mud circulation well-washing operation time and risks of downhole complex accidents are reduced.

The invention provides water-in-oil drilling fluid and a preparation method thereof. The drilling fluid comprises an oil phase, a water phase and an additive; the additive comprises high-softening point asphalt composition particles, a promoter, and an emulsifier. Addition of the high-softening point asphalt composition particles is 1-5% of the total mass of the drilling fluid. Average particle size of the high-softening point asphalt composition particles is less than 60 mesh. The drilling fluid solves the problems of plugging and bad leak-off reduction effect, because good particle state and high temperature deformation capability cannot be kept due to extra high oil solubility, when the high-softening point asphalt is applied to oil base drilling fluid. At the same time, when the water content in the water-in-oil drilling fluid is high, the problems that heat stability and electrical stability become bad are solved by means of synergistic effects of the appropriate main emulsifier, the auxiliary emulsifier and the high-softening point asphalt composition particles; the drilling fluid can be widely applied to the deep oil gas drilling operation process.

The invention relates to a streamlined PDC drill bit for improving rock-carrying capacity and a design method thereof. The streamlined PDC drill bit body is provided with five novel streamlined blades, and a flow channel between the tails of each adjacent blade is arranged with one Asymmetric twisted splitter vanes. The streamlined PDC bit design method for improving rock-carrying capacity includes two parts: a new streamlined blade design method and an asymmetric twisted split blade design method. Compared with the traditional PDC bit, the present invention adds a splitter vane in the flow channel between the tails of two adjacent blades, and the blade adopts a new streamlined design, which accelerates the fluid flow rate in the annular space, thereby improving the rock-carrying efficiency and Prevent mud bag generation and improve drilling efficiency.

The invention discloses a modified epoxy asphalt particle, a water-in-oil base drilling fluid and a preparation method thereof. The components of the modified epoxy asphalt particles of the present invention include: modified asphalt, epoxy resin, and curing agent, wherein the components of the modified asphalt include: matrix asphalt, organic acid anhydride, SBR mother liquor, and crosslinking agent. The modified epoxy asphalt particle of the present invention not only has a small particle size, but also has a certain elastic deformation ability, and has excellent high temperature resistance. The drilling fluid has good rheological properties and high temperature and high pressure fluid loss reduction effect when used at high temperature.