Particle drilling method

Abstract

A particle drilling method includes steps of: (a) injecting particles, namely injecting slurry and the particles into a well through an injection device; (b) recovering the particles, specifically including steps of: enabling a mixture of particles, rock debris and slurry returned from the well to directly flow into a magnetic separator ( 10 ) by a pipeline through a rotational control head at a drill floor; sending separated particles into a storage tank by the magnetic separator ( 10 ); and sending a mixture of rock debris and slurry into a slurry tank ( 11 ); and (c) injecting the particles in the storage tank into the well through the injection device for drilling again, so as to form a drilling circulation. The above method effectively solves a problem of many slurry leakage points in prior arts and greatly reduces an environmental pollution risk.

1 . A particle drilling method, comprising steps of particle injection and particle recovery, wherein
 the step of particle injection specifically comprises a step of injecting slurry and particles into a well through an injection device;   the step of particle recovery specifically comprises steps of: enabling a mixture of particles, rock debris and slurry returned from the well to directly flow into a recovery device by a pipeline through an exit device at a well mouth of a drill floor with utilizing liquid energy; sending separated particles into a storage tank by a magnetic separator of the recovery device; and sending a mixture of rock debris and slurry into a slurry tank; and   after the steps of particle injection and particle recovery, the particles in the storage tank are transported to the injection device and then injected into the well through the injection device for drilling again, so as to form a particle impact drilling circulation.   
     
     
         2 . The particle drilling method, as recited in  claim 1 , wherein in the step of particle injection, a particle injection speed is 0.5-10 kg/s. 
     
     
         3 . The particle drilling method, as recited in  claim 1 , wherein in the step of particle injection, a particle injection pressure is 5-55 MPa. 
     
     
         4 . The particle drilling method, as recited in  claim 1 , wherein: the storage tank is a rotational storage tank, comprising a tank body, blades arranged in the tank body, a support frame, a screen barrel and a motor driving the tank body to rotate; the blades and the support frame are fixed on an inner wall of the tank body; and the screen barrel is connected with the blades through the support frame. 
     
     
         5 . The particle drilling method, as recited in  claim 1 , wherein: the injection device is a double-injection-pump continuous injection device, comprising a particle mixing hopper which is connected with a drilling vertical pipe through a high-pressure pipeline; a reversing pipe is arranged in the particle mixing hopper; the reversing pipe is connected with a swinging hydraulic cylinder which drives the reversing pipe to swing from left to right; a first transporting cylinder and a second transporting cylinder are connected with the particle mixing hopper; when injecting the particles, a first hydraulic cylinder, a second hydraulic cylinder and the swinging hydraulic cylinder are firstly started; the first hydraulic cylinder starts an addition stroke, the swinging hydraulic cylinder swings the reversing pipe to the second transporting cylinder so that the reversing pipe is interconnected with the second transporting cylinder, and the particles and the slurry enter the first transporting cylinder; meanwhile, the second hydraulic cylinder starts a compression stroke that the particles and the slurry in the second transporting cylinder are injected into the high-pressure pipe through the reversing pipe to enter an inner well circulation; the first hydraulic cylinder starts a compression stroke after ending the addition stroke, and the second hydraulic cylinder starts an addition stroke, so as to continuously inject the particles through an alternate operation. 
     
     
         6 . The particle drilling method, as recited in  claim 5 , wherein: the swinging hydraulic cylinder comprises cylinder bodies, pistons, piston rods, a swinging rod and a spline connected with the swinging rod; the pistons are connected with the swinging rod through the respective piston rods; and the reversing pipe is connected with the spline. 
     
     
         7 - 8 . (canceled) 
     
     
         9 . The particle drilling method, as recited in  claim 5 , wherein an arrow-shaped check valve is connected with the high-pressure pipeline. 
     
     
         10 . The particle drilling method, as recited in  claim 6 , wherein an arrow-shaped check valve is connected with the high-pressure pipeline. 
     
     
         11 . The particle drilling method, as recited in  claim 1 , wherein the exit device comprises a rotational sprayer and a rotational control head connected with the rotational sprayer.