Super-combustion type double-acting drilling tool for downhole impact rock crushing and method for downhole impact rock crushing
A double-acting, combustion-type technology, applied in drilling equipment, earth-moving drilling, driving devices for drilling in wellbore, etc., can solve the problems of work efficiency, long rock impact time, energy consumption, etc.
Active Publication Date: 2019-04-09
JILIN UNIV
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Problems solved by technology
[0002]The crushing of hard rock in foundation engineering construction and drilling engineering is a time-consuming, energy-consuming, and consumable process, especially the crushing of hard and brittle rock will Cause huge wear and reduce the service life of the tool; and the rock-breaking method of the tool will have a greater impact on work efficiency
At present, rock crushing is the main way of rock crushing, and the principles of impact are various. For example, Chinese patents CN202937185U, CN107605396A and other hydraulic impactors or CN104481395A pneumatic impact technology all use high-pressure liquid or gas as the impact power, and the impact energy of gas and liquid The release process is also a process of pressure reduction, and this process requires a short time to accumulate, so the impact of this type of impactor on the rock takes a long time
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[0023] A super-combustible double-action hole bottom impact rock-breaking drilling tool, including a mixing chamber 2, a cooling pipe 10, a casing 3, a slider 14, a hammer body 9, a percussion drill bit 21, an air pipe 11 and an oil pipe 12;
[0024] The mixing chamber 2 is installed on the upper end of the housing 3, and the air pipe 11 and the oil pipe 12 lead into the mixing chamber 2, and the mixing chamber 2 can evenly mix a certain proportion of air and fuel passed through the air pipe 11 and the oil pipe 12;
[0025] There is a cylindrical cavity in the center of the housing 3, and the cylindrical cavity is divided into an upper cavity 18 and a lower cavity 19 by the hammer body 9. The outer side of the cylindrical cavity is provided with an upper cavity inlet 15, a lower cavity inlet 4, The upper cavity exhaust port 17, the lower cavity exhaust port 7 and the cooling channel 22;
[0026] The upper chamber exhaust port 17 communicates with the upper chamber signal chann...
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The invention provides a super-combustion type double-acting drilling tool for downhole impact rock crushing and a method for the downhole impact rock crushing. The drilling tool comprises a mixing chamber, a cooling pipe, a casing, a slider, a hammer, an impact drill bit, a gas pipe and an oil pipe, wherein a cavity in the casing can be divided into an upper cavity and a lower cavity by the hammer. The method is mainly characterized in that fuel introduced into the cavity from the mixing chamber and air explode under the pressure, and the hammer drives the impact drill bit to perform impact rock crushing under the action of instantaneous impact produced by explosion; besides, the slider is controlled to move by instantaneous high-pressure gas produced by the explosion, and then fuel supply of the upper cavity and the lower cavity is switched, so that the explosion occurs alternately in the upper cavity and the lower cavity to drive the impact drill bit to impact rocks in a reciprocating manner; meanwhile, gas produced by the explosion can carry rock debris to return to the ground, and debris removal work is completed.
Description
technical field [0001] The invention relates to a drilling tool for impacting rock at the bottom of a hole, in particular to a method for impacting rock at the bottom of a hole. Background technique [0002] The crushing of hard rocks in basic engineering construction and drilling engineering is a time-consuming, energy-consuming, and material-consuming process, especially the crushing of hard and brittle rocks will cause huge wear and tear on tools and reduce the service life of tools; The rock method will have a greater impact on work efficiency. At present, rock crushing is the main way of rock crushing, and the principles of impact are various. For example, Chinese patents CN202937185U, CN107605396A and other hydraulic impactors or CN104481395A pneumatic impact technology all use high-pressure liquid or gas as the impact power, and the impact energy of gas and liquid The release process is also a process of pressure reduction, and this process requires a short time to a...
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IPC IPC(8): E21B4/14E21B21/16
CPCE21B4/14E21B21/16
Inventor 李强孙友宏刘召郭威
Owner JILIN UNIV