CN2544085Y

CN2544085Y - Downhole large diameter reamer

Info

Publication number: CN2544085Y
Application number: CN01251188U
Authority: CN
Inventors: 李永和
Original assignee: INST OF ENGINEERING TECHNOLOGY LIAOHE PETROLEUM EXPLORATION BUREAU
Current assignee: INST OF ENGINEERING TECHNOLOGY LIAOHE PETROLEUM EXPLORATION BUREAU
Priority date: 2001-10-26
Filing date: 2001-10-26
Publication date: 2003-04-09
Anticipated expiration: 2011-10-26

Abstract

The utility model relates to a large diameter hole enlarger used under radial horizontal well during exploitation in oil field, which adopts combined measure of mechanical and hydraulic reaming to reduce reaming distortion distance and guarantee reaming regularity. A reaming knife is fixed to the main body by pins and a liquid channel is arranged in the main body; the lower end of the reaming knife is provided with a primary high pressure nozzle and the front end with a secondary high pressure nozzle to carry out rock breaking and reaming at the near shaft lining or distant shaft lining; a broaching tool is pushed upwards from bottom; a flow passage (channel) is arranged in the reaming knife and the high pressure liquid flows out from the flow passage through the high pressure nozzle under the effect of ground pump pressure to realize hydraulic jet reaming and a piston arranged under the reaming knife pushes the reaming knife to open; a spring arranged between the piston and the main body drives the piston to reset to reduce reaming distortion distance. A PDC composite wave plate is arranged at the front end of the beaming knife to scrape shaft lining to guarantee regularity of the shaft lining.

Description

A kind of down-hole major diameter reamer

Technical field:

The utility model relates to a kind of down-hole major diameter reamer that a kind of oil field oil recovery radially horizontal well down-hole is used.

Background technology:

Reaming tool at present commonly used adopts mechanical doctor or gear wheel mode to carry out reaming, and along with counter bore diameter increases, the reaming torque also increases, and then causes drilling tool or cutter to twist off, and the reaming down-hole accident is various.And the reaming of pure water power is subjected to the restriction of jet length, can't realize the desired counter bore diameter of high-pressure spray radially horizontal well.Current, the high-pressure spray radially horizontal well is a kind of emerging oil exploitation new technology, can improve the development degree of oil and gas reserves effectively, the major diameter counter-boring techniques is one of high-pressure spray radially horizontal well key technology, because counter bore diameter big (Φ 600), conventional reaming tool creeps into mode by machinery, and the reaming torque is big, the reaming success rate is low, and down-hole accident easily takes place.

Summary of the invention:

For overcome that used reaming tool of the prior art exists along with counter bore diameter increases, the deficiency that the reaming torque also increases, the utility model provides a kind of mechanical hole reaming and jetting are combined to carry out reaming, and performance hydraulic drilling moment of torsion is little, the fireballing advantage of machinery knives reaming solves " the down-hole major diameter reamer " that the reaming moment of torsion is big in the prior art, success rate is low.

The technical scheme that its technical problem that solves the utility model adopts is: mechanical hole reaming and jetting are combined realize reducing rule and the requirement that the reaming torque guarantees reaming again, improve major diameter reaming success rate, its primary structure is at the cornish bit front end one group of hydrojet nozzle to be housed, it can stretch to the borehole wall simultaneously with opening of cutter, relies on the broken rock of high-pressure hydraulic jet-action; Another group nozzle is housed in the cutter hub bottom, and it can play the broken rock effect of nearly well reaming, and this push broach mechanism adopts from the bottom up the effect that (prior art is to push away from top to bottom) has the initial channel selection of increase rank power that pushes away simultaneously.The utility model is that broad is fixed on the main body by bearing pin, is installed in piston and intersubjective spring can promote piston reset, and plug is housed on main body, in the broad end PPC sheet is housed, and this reamer is connected with drill string; The utility model is also set up: be provided with passage (runner) in main body, and in its lower end one group of one-level high pressure nozzle be housed, at the broad front end one group of secondary high pressure nozzle is housed, secondary nozzle is connected on bearing pin by hollow and the broad.Highly pressurised liquid sprays in high pressure nozzle by the runner in the broad.Being installed in piston below the broad upwards promotes broad and opens under the effect of surface pump.Piston is by sealing ring realization and main body and center-pole sealing.Be installed in piston and intersubjective spring can promote piston reset.Center-pole is installed in main body the inside, prevents that highly pressurised liquid from revealing from the main body middle part, simultaneously the spacing ring below the piston is connected and fixed with screw thread and main body.Realize solving the problem that reaming torque of the prior art is big, success rate is low.

The beneficial effects of the utility model are to have the reaming of minimizing torque owing to adopt mechanical hole reaming and waterpower reaming to organically combine, drilling tool and cutter twist off less, reaming speed is fast, can guarantee the rule of reaming again, can also reduce the reaming accident effectively, improve major diameter reaming success rate.

Description of drawings:

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the utility model overall structure schematic diagram.

Fig. 2 is the thin portion of a utility model structural representation.

Among the figure 1, main body, 1-1, passage (runner), 2, bearing pin, 3, broad, 3-1, cutter passage, 3-2, PDC composite sheet, 3-3, secondary nozzle, 4, piston, 4-1, sealing ring, 5, center-pole, 6, complex spring, 7, spacing ring, 8, first order jet nozzle, 9, plug, 10, drill string, 11, the stratum.

The specific embodiment:

In Fig. 1, piston 4 is realized and main body 1 and center-pole 5 sealings by sealing ring 4-1.The spring 6 that is installed in 1 of piston 4 and main body promotes piston 4 and resets.Center-pole 5 is installed in main body 1 the inside, prevents highly pressurised liquid from the leakage of main body 1 middle part, the highly pressurised liquid flow channels is provided for simultaneously piston 4 and one-level high pressure nozzle 8.Plug 9 is housed on main body 1 prevents the highly pressurised liquid leakage.Being installed in piston 4 following spacing rings 7 is connected and fixed by screw thread and main body 1.

In Fig. 2, the utility model is that the measure of adopting machinery to combine with the waterpower reaming realizes reducing the reaming torque, guarantees the rule of reaming, and broad 3 is fixed on the main body 1 by bearing pin 2.In main body 1, be provided with fluid passage (runner) 1-1, and the broken rock reaming of the nearly borehole wall of one group of one-level high pressure nozzle, 8 enforcements be housed in its lower end; Front end at broad 3 is equipped with one group of secondary high pressure nozzle 3-3, implements the broken rock reaming of the borehole wall far away; The mechanism of push broach simultaneously pushes away from the bottom up, and is opposite with prior art.Be connected with secondary high pressure nozzle 3-3 on the broad 3 by the bearing pin 2 of hollow.Secondary high pressure nozzle 3-3 on the broad 3 is connected with PDC composite sheet 3-2.Be provided with runner (passage) 3-1 in the broad 3.Highly pressurised liquid flows out from high pressure nozzle 3-3 by the runner 3-1 in the broad 3 to be realized the jetting reaming reducing the reaming torque.Being installed in pistons 4 below the broad 3 upwards promotes broad 3 and opens under the surface pump effect.The utility model is connected with drill string 10 to be lowered to implements down-hole well section, under the pump function of ground, the secondary high pressure nozzle 3-3 that the passage of high-pressure fluid by main body 1 arrives broad 3 front ends sprays stratum 11.Highly pressurised liquid sprays stratum 11 by one group of one-level high pressure nozzle 8 that center-pole 5 arrives main body 1 lower end simultaneously.Promoting broad 3 at pump function lower piston 4 opens, when the secondary high pressure nozzle sprays stratum 11, but the PDC composite sheet 3-2 scraping stratum 11 of broad 3 ends, the finishing borehole wall guarantees the rule of the borehole wall, one-level high pressure nozzle 8 is finished the broken rock reaming of the nearly borehole wall, the secondary high pressure nozzle 3-3 of broad and PDC composite sheet are finished the broken rock reaming of this borehole wall jointly, and after finishing reaming, piston 4 resets under the effect of spring 6.Can finish the reaming of Φ 400-700mm diameter by changing the different length broad.

Claims

1, a kind of down-hole major diameter reamer, broad (3) is fixed on the main body (1) by bearing pin (2), being installed in spring (6) between piston (4) and main body (1) can promote piston (4) and reset, plug (9) is housed on main body (1), in broad (3) end PPC composite sheet (3-2) is housed, this reamer is connected with drill string (10), it is characterized in that:

A, in main body (1), be provided with fluid passage (1-1), and one group of one-level high pressure nozzle (8) be housed, one group of secondary high pressure nozzle (3-3) is housed at broad (3) front end in its lower end;

B, piston (4) are realized and main body (1) and center-pole (5) sealing by sealing ring (4-1).