US 12,503,915 B2 · Valve-controlled high-energy hydrostatic down-the-hole impact hammer

Abstract

A valve-controlled high-energy hydrostatic down-the-hole (DTH) impact hammer is provided, including an upper joint, a shell, a drainage device, an upper fixed valve sleeve, a lower fixed valve sleeve, a main valve, a piston hammer, a supporting sleeve, a sealing piston, a guiding sleeve, a stop ring, a fixing casing pipe, and a drilling bit. The impact hammer is internally defined with a first chamber, a second chamber, a third chamber and a pressure relief chamber. The first chamber is responsible for providing drilling fluid to move the piston hammer up and down by realizing the pressure change of the drilling fluid in the second and third chambers through the holes and flow channels in the upper and lower fixed valve sleeves. The impact hammer transfers the main pressure relief mode from the axis of the impact hammer to the pressure relief chamber between the supporting sleeve and the shell.

A valve-controlled hydrostatic down-the-hole (DTH) impact hammer, comprising:

an upper joint (1), a shell (3), a drainage device (14), a guiding sleeve (10), a stop ring (11), a fixing casing pipe (12), and a drilling bit (13);
wherein the drainage device (14) is defined with drainage holes (141);
the guiding sleeve (10) is configured to guide the drilling bit (13) to move along an axial direction;
the stop ring (11) is configured to limit displacement of the drilling bit (13) along the axial direction;
the fixing casing pipe (12) is internally provided with a spline (121) to limit a circumferential rotation of the drilling bit (13);
and the upper joint (1) and the fixing casing pipe (12) are in a threaded connection with the shell (3);
the valve-controlled hydrostatic DTH impact hammer further comprises an upper fixed valve sleeve (4), a lower fixed valve sleeve (7), a main valve (15), a piston hammer (17), a supporting sleeve (8) and a sealing piston (9);
an inner space of the valve-controlled hydrostatic DTH impact hammer is divided into a first chamber (2) and a third chamber (18) by the drainage device (14), the upper fixed valve sleeve (4), the lower fixed valve sleeve (7), the piston hammer (17) and the sealing piston (9);
the lower fixed valve sleeve (7) is defined with a bore (75) therein;
the bore (75) and an upper surface of the piston hammer (17) define a second chamber (16);
the upper joint (1), the shell (3), the upper fixed valve sleeve (4), the lower fixed valve sleeve (7), the supporting sleeve (8) and the sealing piston (9) define a pressure relief chamber (6);
and the upper fixed valve sleeve (4) is defined with first pressurized holes (41) and first pressure relief holes (42);
the main valve (15) is defined with second pressurized holes (151) and second pressure relief holes (152);
when the main valve (15) moves up and down, the first pressurized holes (41) and the second pressurized holes (151) are intermittently connected, and the first pressure relief holes (42) and the second pressure relief holes (152) are intermittently connected;
the sealing piston (9) is defined with third pressure relief holes (91);
the drilling bit (13) is defined with a through first pressure relief flow channel (131);
the first pressure relief holes (42) and the pressure relief chamber (6) are connected to the third pressure relief holes (91);
the upper fixed valve sleeve (4) and the lower fixed valve sleeve (7) together define a control chamber (5);
the lower fixed valve sleeve (7) is defined with a through pressurized flow channel (71), constant flow channels (72) connected to the first chamber (2) and the third chamber (18), and control flow channels (73) connected to the control chamber (5) and the third chamber (18);
when the main valve (15) moves up and down, the pressurized flow channel (71) is intermittently connected to the first chamber (2) and the second chamber (16);
the lower fixed valve sleeve (7) is defined with control holes (74) respectively connected to the control flow channels (73);
the piston hammer (17) is defined with fourth pressure relief holes (172) and a second pressure relief flow channel (174);
when the piston hammer (17) moves up and down, the control holes (74) and the fourth pressure relief holes (172) are intermittently connected;
and the second pressure relief flow channel (174) is connected to the first pressure relief flow channel (131);
and
an inner side of the shell (3) is provided with a fixed step part (31);
the sealing piston (9) is tightly pressed on the fixed step part (31) by the supporting sleeve (8);
the upper fixed valve sleeve (4) is tightly pressed on the lower fixed valve sleeve (7);
and the drainage device (14) and the supporting sleeve (8) are respectively fixed with the upper fixed valve sleeve (4) and the lower fixed valve sleeve (7).

26 more elements

Valve-controlled high-energy hydrostatic down-the-hole impact hammer

Life of this patent

Valve-controlled high-energy hydrostatic down-the-hole impact hammer

Life of this patent

Abstract

Claims11