One or more ram accelerator devices may be used to form one or more holes in geologic or other material. These holes may be used for drilling, tunnel boring, excavation, and so forth. The ram accelerator devices propel projectiles which are accelerated by combustion of one or more combustible gasses
One or more ram accelerator devices may be used to form one or more holes in geologic or other material. These holes may be used for drilling, tunnel boring, excavation, and so forth. The ram accelerator devices propel projectiles which are accelerated by combustion of one or more combustible gasses in a ram effect to reach velocities exceeding 500 meters per second. An endcap may be deployed within a tube of the ram accelerator device to prevent incursion of formation pressure products such as oil, water, mud, gas, and so forth into a guide tube of the ram accelerator. During operation the projectile penetrates the endcap and at least a portion thereof impact a working face. In some implementations a purge gas may be used to form a ullage between the endcap and the working face.
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1. A method for forming a hole, the method comprising: inserting an endcap into a first end of a guide tube;placing the endcap at a position proximate to a second end of the guide tube, wherein the second end is proximate to a working face comprising a geologic material;loading a projectile into a r
1. A method for forming a hole, the method comprising: inserting an endcap into a first end of a guide tube;placing the endcap at a position proximate to a second end of the guide tube, wherein the second end is proximate to a working face comprising a geologic material;loading a projectile into a ram accelerator, wherein: the projectile is configured to produce a ram-effect combustion reaction in one or more combustible gasses within the ram accelerator; andan output of the ram accelerator is coupled to the first end of the guide tube;boosting the projectile to a ram velocity;accelerating the projectile along at least a portion of the ram accelerator by combusting one or more combustible gasses in a ram combustion effect; andprior to exit from the guide tube, penetrating the endcap with the projectile. 2. The method of claim 1, further comprising: forming a barrier, with the endcap, between the second end of the ram accelerator and the geologic material. 3. The method of claim 1, further comprising holding the endcap in the position. 4. The method of claim 1, the placing comprising: injecting the one or more combustible gasses under pressure at one or more points between the endcap and the first end of the ram accelerator, wherein the one or more combustible gasses exert a pneumatic pressure to displace the endcap along the ram accelerator. 5. The method of claim 1, the placing comprising: injecting a gas in the ram accelerator at one or more points between the endcap and the first end of the ram accelerator; andigniting the gas. 6. The method of claim 1, further comprising: before accelerating the projectile, injecting an incombustible gas between the second end of the ram accelerator and the working face, wherein the gas is at a pressure of greater than 6000 kilopascals. 7. The method of claim 1, further comprising: before placing the endcap, injecting an incombustible gas between the second end of the ram accelerator and the working face, wherein the gas is at a pressure of greater than 6000 kilopascals. 8. A method comprising: deploying a tube in a hole, the tube comprising a first end proximate to an entry of the hole and a second end proximate to a working face;deploying an endcap proximate to the second end of the tube; andpropelling a projectile through the endcap, using a ram-effect between the projectile and one or more combustible gasses within at least a portion of the tube, at a velocity greater than or equal to two kilometers per second. 9. The method of claim 8, further comprising: applying a gas at a pressure greater than or equal to a pressure of a formation fluid to a volume in the hole that is between the endcap and the working face. 10. The method of claim 8, further comprising: forming, in the hole, a pocket of gas between the endcap and at least a portion of the working face. 11. The method of claim 8, further comprising: after firing, closing a valve located between the first end of the guide tube and the second end of the guide tube. 12. The method of claim 8, the deploying the endcap comprising injecting a gas under pressure at one or more points between the endcap and the first end of the tube, wherein the gas exerts a pneumatic pressure to displace the endcap to the second end of the tube. 13. The method of claim 8, the deploying the endcap comprising applying a negative fluid pressure outside of the second end of the tube to draw the endcap to the second end of the tube. 14. The method of claim 8, the deploying the endcap comprising pushing the endcap to the second end of the tube with a mechanical member. 15. The method of claim 8, the deploying the endcap comprising sinking the endcap to the second end of the tube.
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이 특허에 인용된 특허 (23)
Cherrington Martin D. (Cherrington Corp. ; 7398 San Joaquin Sacramento CA 95820) Cherrington William D. (Cherrington Corp. ; 7398 San Joaquin Sacramento CA 95820), Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein.
Watson John David, Method and apparatus for controlled small-charge blasting of hard rock and concrete by explosive pressurization of the bottom of a drill hole.
Hertzberg Abraham (Bellevue WA) Bruckner Adam P. (Seattle WA) Bogdanoff David W. (Mountain View CA) Knowlen Carl (Seattle WA), Method and apparatus for initating stable operation of a ram accelerator.
Hertzberg Abraham (Bellevue WA) Bruckner Adam P. (Seattle WA) Knowlen Carl (Seattle WA) McFall Keith A. (Seattle WA), Method and apparatus for zero velocity start ram acceleration.
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