CN2386178Y

CN2386178Y - Mixed drilling bit

Info

Publication number: CN2386178Y
Application number: CN 99237363
Authority: CN
Inventors: 李林
Original assignee: Kingdream PLC
Current assignee: Sinopec Oilfield Equipment Corp
Priority date: 1999-03-23
Filing date: 1999-03-23
Publication date: 2000-07-05
Anticipated expiration: 2009-03-23

Abstract

The utility model discloses a mixed drilling bit for drilling, and the mixed drilling bit for drilling is used for the petroleum, the natural gas, or other purposes. The drilling bit is composed of a coring diamond drilling bit and a spherical one-cone drilling bit. The coring diamond drilling bit cuts the stratum, and an annular groove is made. Thereby, a rock core is produced. The spherical one-cone drilling bit which is arranged in the inner cavity of the mixed drilling bit crushes the rock core, and the spherical one-cone drilling bit and a wear-resistant alloy arranged on the wall surface of an inner cavity of the coring diamond drilling bit together grind rock fragments with large sizes. The rock fragments are exhausted from fragment discharging holes. The rock-breaking mechanisms of the coring diamond drilling bit and the spherical one-cone drilling bit are similar. The service life of the drilling bit can be lengthened, and the mechanical drilling speed can be increased.

Description

A kind of Mixed drilling bit

The utility model relates to a kind of drill bit that aspect drilling wells such as oil, natural gas are used that is used for, and this drill bit is by getting core formula diamond bit and spherical single-cone rotary drill bit combines.

United States Patent (USP) 5,016 is mentioned by getting the Mixed drilling bit that core formula diamond bit and tricone bit combine in 718 and 5,176,212.This Mixed drilling bit has following shortcoming: at first, tricone bit is by impacting and scraping and squeeze the mode fractured rock, and the impact force of generation can be damaged diamond tooth, reduces drilling life of bit.Secondly, the rotating speed of tricone bit gear wheel is faster than drill speed, and its bearing generally is unsuitable for high rotating speed, has limited diamond tooth with best linear velocity cutting stratum.Moreover the size of tricone bit can not be too little, otherwise bit leg journel holds because of size is too little and can't stand the pressure of the drill that should bear.In addition, the entrance and exit of getting chip-removal hole on the core formula diamond drill machine head cavity wall equates that the landwaste that the broken core of tricone bit is produced stops up chip-removal hole easily.United States Patent (USP) 3,424,258 mention the Mixed drilling bit that core formula diamond bit and conic single gear drill bit combine, the movement locus of the conic single gear drill bit of this Mixed drilling bit in the shaft bottom is similar to a gear wheel of tricone bit, the main mode of fractured rock also is analogous to tricone bit, is to impact and scrape crowded.

The purpose of this utility model is to propose a kind of by getting the Mixed drilling bit that core formula diamond bit and spherical single-cone rotary drill bit combine, have the prolongation drilling life of bit, make bit size enough little, adapt to high rotating speed, solve the problem that landwaste stops up chip-removal hole, obtain the effect of optimum drilling rate.

Spherical single-cone rotary drill bit bearing size is big, can bear bigger the pressure of the drill, gear wheel rotating ratio drill speed low 60%～80%, can bear higher drill speed, drill bit mainly with the cutting way fractured rock, is aided with crushing, and there is very big sliding motion on the gear wheel surface with respect to the shaft bottom.Getting core formula diamond bit does not have tumbler, is applicable to high rotating speed; Because it belongs to chipping type bit, cutting teeth is with simple circumferential cutting way fractured rock in the shaft bottom, at the concentric circles zone of fracture of shaft bottom shape unification circle circle; Cutting teeth increases to maximum from bit central to border line speed from zero; The radius of a circle of getting core formula diamond bit cutting teeth is close, and the linear velocity of cutting movement is close, helps drill bit and creeps into optimum speed, gives full play to the advantage of diamond bit.Thereby get the Mixed drilling bit that core formula diamond bit and spherical single-cone rotary drill bit combine close by the fractured rock mode has the prolongation drilling life of bit, adapts to high rotating speed, solves the problem that landwaste stops up chip-removal hole, obtains the effect of optimum drilling rate.

In order to achieve the above object, the utility model by the following technical solutions: Mixed drilling bit is by getting core formula diamond bit and spherical single-cone rotary drill bit combines.Get core formula diamond bit for getting core formula PDC drill bit, get core formula TSP drill bit or getting core formula ND drill bit.Get on the internal chamber wall of core formula diamond bit upper body and have chip-removal hole.Chip-removal hole is circular, rectangle, the figure of ellipse or the combination of other closed curve.Chip-removal hole to go into young outlet big.Getting on the core formula diamond bit lower body internal chamber wall has high-abrasive material, high-abrasive material sintering, insert or be welded on the lower body internal chamber wall.Spherical single-cone rotary drill bit diameter is less than getting core formula diamond bit lower body minimum diameter, and its difference is 5～10mm.Spherical single-cone rotary drill bit is being got in the core formula diamond bit inner chamber by welding or screwed connection.Spherical single-cone rotary drill bit is with to get core formula diamond bit coaxial.

Compared with prior art, the utility model combines the advantage of getting core formula diamond bit and spherical single-cone rotary drill bit, have following beneficial effect: the broken rock mode of spherical single-cone rotary drill bit is with to get core formula diamond bit close, and is little to the extent of damage of diamond tooth, can prolong bit life; Because spherical single-cone rotary drill bit gear wheel journal size is bigger, can bear higher the pressure of the drill, can make the Mixed drilling bit size enough little, obtains optimum drilling rate, and adapt to high rotating speed.The chip-removal hole outlet is changed from small to big and is fan-shaped, helps chip removal, can solve the landwaste blocking problem.

Be described further below in conjunction with drawings and Examples:

Fig. 1 is the Mixed drilling bit structural representation;

Fig. 2 gets core formula diamond bit upper body structural representation;

Fig. 3 gets core formula diamond bit lower body structural representation;

Fig. 4 is the A-A sectional drawing of Fig. 1;

Fig. 5 is the upward view of Mixed drilling bit;

Fig. 6 is spherical single-cone rotary drill bit structural representation;

Fig. 7 is spherical single-cone rotary drill bit inner chamber inlet schematic diagram;

Among the figure: 1. Mixed drilling bit; 2. upper body; 3. lower body; 4. chip-removal hole; 5. upper body upper end screw thread; 6. inner screw thread; 7. screw thread; 8. endoporus; 9. runner; 10. diamond cutting tooth; 11. nozzle; 12. hard-metal insert; 13. wear-resistant alloy layer; 14. chip area; 15. gear wheel; 16. tooth; 17. inner chamber; 18. six rib endoporus; 19. nozzle; 20. nozzle

Mixed drilling bit (1) is by getting core formula diamond bit and spherical single-cone rotary drill bit is formed.Get core formula diamond bit and be divided into upper body (2) and lower body (3).Have on the epicoeloma wall into the big fan-shaped chip-removal hole (4) of young outlet, upper end screw thread (5) is used for linking with drill string, inner screw thread (6) is used for linking with spherical single-cone rotary drill bit, and endoporus (8) links with the drill string endoporus, and guided drilling liquid enters runner (9) and spherical single-cone rotary drill bit inner chamber (17); Diamond cutting tooth (10) (what adopt in the present embodiment is the PDC cutting teeth) and nozzle (11) are arranged in the lower surface of lower body (3), arrange hard-metal insert (12) on the inside and outside gage surface, build-up wear-resistant alloy-layer (13) on the internal face, weld mutually with lower body (3) upper body (2), constitute and get core formula diamond bit, its external surface has chip area (14).Spherical single-cone rotary drill bit has gear wheel (15), tooth (16) is arranged on it, screw thread (7) is used for linking with screw thread (6), inner chamber (17) entrance is six rib endoporus (18), six prismatic spanners can insert this hole and be used to tighten spherical single-cone rotary drill bit, and inner chamber (17) communicates with nozzle (19) and (20), and nozzle (19) is used to clean gear wheel, prevent mud drum, nozzle (20) is used for auxiliary rock.Spherical single-cone rotary drill bit diameter is less than lower body (3) minimum diameter 5～10mm, thereby makes spherical single-cone rotary drill bit put into or to take out from the lower end of getting core formula diamond bit.Get and dig out a ring-shaped groove when core formula diamond bit creeps in the shaft bottom, thereby produce a core, spherical single-cone rotary drill bit stirs and grinds broken this core, and the core chip enters annular space from chip-removal hole (4), and the landwaste that cuts with diamond tooth (10) returns to ground.Chip-removal hole (4) is gone into young and outlet is fan-shaped greatly, can prevent that landwaste in irregular shape from rolling in the hole and stop up chip-removal hole, can diminish under cutter teeth (16) and stirring of wear-resistant alloy layer (13) are ground and discharge greater than the landwaste of inlet size.

Claims

1. Mixed drilling bit is characterized in that this drill bit by getting core formula diamond bit and spherical single-cone rotary drill bit combines, spherical single-cone rotary drill bit by welding or screwed connection to getting in the core formula diamond bit inner chamber.

2. Mixed drilling bit according to claim 1 is characterized in that getting core formula diamond bit for getting core formula PDC drill bit, get core formula TSP drill bit or getting core formula ND drill bit.

3. the core formula diamond bit of getting according to claim 2 is characterized in that having chip-removal hole on the drill bit epicoeloma wall.

4. the core formula diamond bit of getting according to claim 3 is characterized in that chip-removal hole is circular, rectangle, the figure of ellipse or the combination of other closed curve.

5. the core formula diamond bit of getting according to claim 3 is characterized in that the young outlet of going into of chip-removal hole is big.

6. the core formula diamond bit of getting according to claim 2 is characterized in that on the drill bit lower body internal chamber wall high-abrasive material being arranged, high-abrasive material sintering, insert or be welded on the drill bit lower body internal chamber wall.

7. Mixed drilling bit according to claim 1 is characterized in that spherical single-cone rotary drill bit diameter less than getting core formula diamond bit lower body minimum diameter, and its difference is 5～10mm.

8. Mixed drilling bit according to claim 1 is characterized in that spherical single-cone rotary drill bit and to get core formula diamond bit coaxial.

9. Mixed drilling bit according to claim 1 is characterized in that spherical single-cone rotary drill bit screw thread end endoporus is six rib holes.