(0)E21B:3/6:
IPC6
SECTION E - FIXED CONSTRUCTIONS
EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS,...
E21B
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<<   >>   E21B021/00 - E21B029/12  

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/ 00 Methods or apparatus for flushing boreholes (freeing objects stuck in boreholes by flushing E 21 B 31/03; well drilling compositions C 09 K 7/00; dust eliminating or removing in mining or quarrying E 21 C 7/00) [2]

21
/ 02 • Swivel joints in hose lines  

21
/ 06 • Arrangements for treating drilling fluids above ground (treating steps per se, see the relevant subclasses) [3]  

21
/ 08 • Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure (valve arrangements therefor E 21 B 21/10) [3]  

21
/ 10 • Valves arrangements in drilling-fluid circulation systems (valves in general F 16 K) [3]  

21
/ 12 • using drilling pipes with plural fluid passages, e.g. closed circulation systems (pipes with plural fluid passages E 21 B 17/18) [3]  

21
/ 14 • using liquid and gaseous fluids, e.g. foams [3]  
 

 23
/ 00 Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells (setting of casings, screens, or liners E 21 B 43/10)

23
/ 01 • for anchoring the tools or the like (E 21 B 23/02 to E 21 B 23/06 take precedence; anchoring of drives in the borehole E 21 B 4/18) [6]  

23
/ 02 • for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing (E 21 B 23/03 to E 21 B 23/06 take precedence) [3]  

23
/ 03 • for setting the tools into, or removing the tools from, laterally offset landing nipples or pockets [3]  

23
/ 04 • operated by fluid means, e.g. actuated by explosion (E 21 B 23/06, E 21 B 23/08 take precedence) [3]  

23
/ 06 • for setting packers  

23
/ 08 • Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems (special provisions on heads therefor E 21 B 33/068; cementing plugs E 21 B 33/16; scrapers operated by fluid pressure E 21 B 37/04) [3]  

23
/ 10 • • Tools specially adapted therefor [3]  

23
/ 12 • • Tool diverters [3]  

23
/ 14 • for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells (by fluid pressure E 21 B 23/08; provision on well heads for introducing or removing cable-operated tools E 21 B 33/072, E 21 B 33/076) [6]  
 

 25
/ 00 Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (core bits E 21 B 10/02; using explosives or projectiles in boreholes E 21 B 49/04; side-wall sampling or coring E 21 B 49/06)

25
/ 02 • the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe (retrievable drill bits E 21 B 10/64) [3]  

25
/ 04 • • the core receiver having a core forming cutting edge or element, e.g. punch type core barrels [3]  

25
/ 06 • the core receiver having a flexible liner or inflatable retaining means [3]  

25
/ 08 • Coating, freezing, consolidating cores (E 21 B 25/06 takes precedence); Recovering uncontaminated cores or cores at formation pressure [3]  

25
/ 10 • Formed core retaining or severing means (E 21 B 25/06, E 21 B 25/08 take precedence) [3]  

25
/ 12 • • of the sliding wedge type [3]  

25
/ 14 • • mounted on pivot transverse to core axis [3]  

25
/ 16 • for obtaining oriented cores [3]  

25
/ 18 • the core receiver being specially adapted for operation under water [3]  
 

 27
/ 00 Bailers; Valve drill bits [6]

27
/ 02 • Dump bailers, i.e. containers for depositing substances, e.g. cement or acids, in boreholes or wells [6]  
 

 28
/ 00 Vibration generating arrangements for boreholes or wells, e.g. for stimulating production (for drilling E 21 B 7/24; for transmitting measuring-signals E 21 B 47/14; for geophysical measurements G 01 V 1/02) [6]
 

 29
/ 00 Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows (perforators E 21 B 43/11); Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground

29
/ 02 • by explosives or by thermal or chemical means (destroying objects in boreholes or wells by explosives E 21 B 31/16)  

29
/ 04 • Cutting of wire lines or the like (E 21 B 29/02 takes precedence) [3]  

29
/ 06 • Cutting windows, e.g. directional window cutters for whipstock operations (E 21 B 29/08 takes precedence; whipstocks E 21 B 7/08) [3]  

29
/ 08 • Cutting or deforming pipes to control fluid flow (blow-out preventers E 21 B 33/06) [3]  

29
/ 10 • Reconditioning of well casings, e.g. straightening [3]  

29
/ 12 • specially adapted for underwater installations (E 21 B 29/08 takes precedence) [3]  
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