空气锤钻井英文课件(Air Hammer Drilling).ppt

1、Air Hammer Drilling,Optimum Conditions for Use,Hard rock areas with associated low drillability. Areas where hole deviation is a concern. Horizons where there is no water influx or this influx is negligible.,Air Hammer Advantages,Very low required bit weights. High compressive force at the bit. Mini

2、mal deviation tendencies. Excellent bit life - Bits often reusable on subsequent wells. Excellent on-bottom time - Fewer trips improves average penetration rate.,Air Hammer Advantage,Air Hammer Technology,Drillstring rotation indexes the bit inserts to a fresh rock surface during each beat of the ai

3、r hammer. The rocks natural tendency to propagate fractures is used to maximize cuttings size. Rpm in the 20 to 30 range usually provides maximum air hammer penetration rates.,The Ingersoll-Rand QL Series,Maximizes efficiency and develops greater power than any other hammer. Their use will result in

4、 15% to 30% higher rate of penetration over competitors hammers. This results in a significant cost savings to the operator.,QL Air Hammer Specifications,QL-80 : 7 inch OD, maximum bit 10 inches QL-120 : 11 inch OD, maximum bit 17 1/2 inches,Introduction to Air Hammer Technology,The Ingersoll-Rand Q

5、L Series Air Hammer power cycle is illustrated on the following slides:,Ingersoll-Rand QL Air Hammer,Major Parts,Check Valve Valve Pressure Close Port Drive Volume Blow Port Piston Return undercut Return Chamber,Distributor Guide Piston Exhaust Tube Bit,IR QL Air Hammer Power Cycle,Circulating Bit O

6、ff Bottom,Air is metered through blow holes in Cylinder. Blow Ports closed. Tail of Piston seals Cylinder feed port preventing drill from running while off bottom. Front of Piston seals off Return Chamber from high pressure air, also preventing running off bottom.,IR QL Air Hammer Power Cycle,Cycle

7、Start,Valve closed. Blow Ports closed. Cylinder feed port is open, allowing high pressure air to enter Return Chamber.,IR QL Air Hammer Power Cycle,Drive Chamber Closes.,Piston Tail Bore seals with Distributor Guide to begin compressing air in Drive Chamber.,IR QL Air Hammer Power Cycle,Front Portin

8、g Closes.,Air in Drive Chamber continues to compress. Return Volume porting closes and air in Return Chamber expands pushing Piston upward.,IR QL Air Hammer Power Cycle,Return Chamber Exhausts,Air in Drive Chamber continues to compress. Inertia of Piston continues upward travel and Drive Volume comp

9、ression. Piston clears Exhaust Tube on bit venting remaining air in Return Chamber.,IR QL Air Hammer Power Cycle,Valve Opens,Pressure in Drive Chamber forces Valve open. Drive Chamber pressure increases as high pressure air rushes in. The Piston slows to a stop and reverses direction.,IR QL Air Hamm

10、er Power Cycle,Piston Reverses Direction,Piston starts downward travel. Valve is still open and high pressure air is filling Drive Volume accelerating Piston towards bit.,IR QL Air Hammer Power Cycle,Pressure Assisted Valve Closure.,Pressure Close Port opens, and a signal is transmitted to assist va

11、lve close timing.,Piston seals on Exhaust Tube and Return Chamber compression begins.,IR QL Air Hammer Power Cycle,Drive Chamber Expansion,Valve shuts and Drive Chamber air expands.,Pressure in Return Chamber continues to build.,IR QL Air Hammer Power Cycle,Drive chamber continues to expand, driving

12、 piston downward.,Return timing opens, high pressure air floods return chamber.,Return Chamber Ports Open,IR QL Air Hammer Power Cycle,Piston Clears Distributor Guide, Pressure Vents to Exhaust.,Drive Chamber Exhausts,IR QL Air Hammer Power Cycle,Piston Impacts Bit Cycle Repeats,Piston Impact,IR QL

13、Air Hammer Power Cycle,The Hydrocyclone,The Hydrocyclone Advantage,Ingersoll-Rand Hammer Bits,Bit Shank is 30% larger than competitors. More splines and plastic inserts reduces friction and prolongs bit life.,We supply IR Air Hammer Bits from 215.9 mm to 444.5 mm. Diamond enhanced inserts can be substituted for standard tungsten carbide to suit your specific drilling conditions.,12.25 PCD 1 Row,Ingersoll-Rand Hammer Bit,TWO SURFACE HOLE INTERVALS Total meters drilled - 1051 m. Total Hrs. on Bottom - 69 Total Hrs. Circ. - 18.5 WOB - .5 to 2.5 daN RPM - 20 - 32 Air Vol. - 80