CN2653113Y

CN2653113Y - Hydraulic expansion type PDC hole expander

Info

Publication number: CN2653113Y
Application number: CN 03218329
Authority: CN
Inventors: 马清明; 陈辉; 吴仲华; 戴金岭; 王卫; 丁世清
Original assignee: DRILLING TECHNOLOGY INST SHENGLI PETROLEUM ADMINISTRATION
Current assignee: DRILLING TECHNOLOGY INST SHENGLI PETROLEUM ADMINISTRATION
Priority date: 2003-06-25
Filing date: 2003-06-25
Publication date: 2004-11-03
Anticipated expiration: 2013-06-25

Abstract

A water force expanding PDC underreamer is characterized in that the upper part of a handspike is connected with a piston, a spring supports the piston, a nozzle is fixed at the center at the top of the handspike, a pressure rod is fixed at the pressure rod frame through a screw, a reaming bit is provided with PDC cutting teeth, the handspike and the limited block control the expansion of the reaming bit through the expanding and contracting of the spring. The circle groove at the middle and lower part of the handspike hooks the flange at the top of the reaming bit through the tension of the spring while drilling, therefore ensures the expanding of reaming bit to be inside the main body. In the circulation of the well drilling liquid, the pressure pushes the piston to move downward, and drives the handspike to support the reaming bit expanding downward, the handspike and the limited block lock the expanding reaming bit to conduct drilling operation. As the reaming bit is fixed on the main body through the pin axle, the main body and other components can be utilized again after replacement of reaming bit due to abrasion.

Description

A kind of hydraulic expansion formula PDC reamer

Technical field:

The utility model belongs to oil, gas drilling special tool(s).

Technical background:

In the casing cementing process of the bottom of deep-well, slim-hole and casing side tracking well, generally the gap of the casing size and the borehole wall is little, and cementing quality is difficult to guarantee.In order to increase the annular clearance of the sleeve pipe and the borehole wall, improve the casing cementing quality, need carry out the underreamer operation, with conventional roller reamer operation owing to the restriction that is subjected to the gear wheel bearing size, this type of job execution difficulty is strengthened, and exist the fall accident potential of well of gear wheel simultaneously.

Summary of the invention:

The utility model designs for solving these the problems referred to above just.It is made up of parts such as main body, push rod, piston, reaming hole wing, PDC cutting teeth, cleaning astern nozzles.Sealing ring is housed on the piston; nozzle is equipped with in the top heart portion of push rod; push rod top links to each other also with piston and spring sets at the main body inner chamber; pressure regulation bar top is fixed on the pressure regulation shaft bar by thread connection; nozzle is inserted in the bottom; the pressure regulation shaft bar is sat and is placed on the step on main body top; be furnished with the PDC cutting teeth on the reaming hole wing; and be fixed on main body middle part by bearing pin; the compression retracting spring; make the cannelure of push rod middle and lower part catch on the boss on reaming hole wing top; the reaming hole wing is tightened in main body; limited block is fixed on lower body part by fastening bolt; in reaming hole wing one side; the bottom of main body is provided with the cleaning astern nozzle; the protection joint links to each other by screw thread with main body; the turn on pump circulation time; drilling fluid flows through nozzle generation pressure and falls; promoting piston moves down and compresses spring; drive is pushed; supporting the reaming hole wing opens outward; drilling fluid flows out from push rod heart portion and cleaning astern nozzle by nozzle simultaneously, and when push rod bottom cylinder all contacted with the back side, reaming hole wing bottom, the reaming hole wing reached maximum outer tension position; in reaming hole creeps into; limited block and reaming hole wing lower end boss, the discrepancy of reaming hole wing has been limited at the push rod bottom cylinder and the back side, reaming hole wing bottom jointly, after the termination of pumping; disappearance falls in pressure; the spring return makes on the piston and moves, and it is up to drive push rod, and the boss of the cannelure pulling reaming hole wing upper end of push rod middle and lower part is up together; the reaming hole wing is withdrawn in the main body, and the purpose of this utility model provides a kind of hydraulic expansion formula PDC reamer.

The utility model is achieved like this; push rod top links to each other also with piston and spring sets at the main body inner chamber; pressure regulation bar top is fixed on the pressure regulation shaft bar by thread connection; nozzle is inserted in the bottom; the pressure regulation shaft bar is sat and is placed on the step on main body top; the reaming hole wing is the multiple edge body of uneven thickness; on; lower end one side is provided with boss; the PDC cutting teeth is equipped with in reaming hole wing bottom, and is fixed on the main body middle part by bearing pin, the compression retracting spring; make the cannelure of push rod middle and lower part catch on the boss on reaming hole wing top; the reaming hole wing is tightened in main body, and limited block is fixed on the bottom of main body by fastening bolt, in reaming hole wing one side; the bottom of main body is equipped with the cleaning astern nozzle; the protection joint links to each other by screw thread with main body, and main body top links to each other with drilling tool by the protection joint, and the bottom links to each other with drill bit or centralizer.The upper and lower part diameter of pressure regulation bar is thin, and the middle part diameter is thicker, and middle part and bottom are made as the bullet transition.Push rod is the reducing cylinder, and the centre is provided with a through hole, and the upper and lower part diameter is thin, and the middle part diameter is thicker, and the middle and lower part is provided with a cannelure.

Description of drawings:

Fig. 1. a kind of hydraulic expansion formula PDC reamer

1. protection joint 2. pressure regulation shaft bars 3. pressure regulation bars 4. pistons 5. sealing rings 6. nozzles 7. push rods 8. springs 9. main bodys 10. bearing pins 11. reaming hole wing 12.PDC cutting teeths 13. limited blocks 14. fastening bolts 15. clean astern nozzle

The specific embodiment:

Now the utility model will be further described in conjunction with Figure of description.

When adopting the utility model to carry out reaming hole when creeping into operation, sealing ring [5] is housed on the piston [4], nozzle [6] is equipped with in the top heart portion of push rod [7], push rod [7] top links to each other also with piston [4] and spring [8] sets at main body [9] inner chamber, pressure regulation bar [3] top is fixed on the pressure regulation shaft bar [2] by thread connection, nozzle [6] is inserted in the bottom, and pressure regulation shaft bar [2] is sat and is placed on the step on main body [9] top.PDC cutting teeth [12] is housed on the reaming hole wing [11]; and be fixed on main body [9] middle part by bearing pin [10]; compression retracting spring [8]; make the cannelure of push rod [7] middle and lower part catch on the boss of reaming hole wing [11] upper end; reaming hole wing [11] is tightened in main body [9], and limited block [13] is fixed on main body [9] bottom with fastening bolt [14], in reaming hole wing [11] one sides; the bottom of main body [9] is provided with cleans astern nozzle [15], and protection joint [1] links to each other by screw thread with main body [9].

When adopting the utility model to carry out reaming hole when creeping into operation, drilling fluid flows through nozzle [6] generation pressure and falls, promoting piston [4] moves down and compresses spring [8], driving push rod [7] opens outside lower support reaming hole wing [11], drilling fluid flows out from push rod [7] heart portion and cleaning astern nozzle [15] by nozzle [6] simultaneously, when push rod [7] bottom cylinder all contacts with reaming hole wing [11] back side, bottom, reaming hole wing [11] reaches maximum outer tension position, in reaming hole creeps into, limited block [13] and reaming hole wing [11] lower end boss, the discrepancy of reaming hole wing [11] has been limited at push rod [7] the bottom cylinder and reaming hole wing [11] back side, bottom jointly, after the termination of pumping, disappearance falls in pressure, spring [8] return makes on the piston [4] and moves, the cannelure that drives push rod [7] middle and lower part upwards spurs the boss of reaming hole wing [11] upper end, and reaming hole wing [11] is withdrawn in the main body [9].Because reaming hole wing [11] is fixed on the main body [9] by bearing pin [10], thus when reaming hole wing [11] weares and teares, replaceable new reaming hole wing [11], main body accessories such as [9] is all reusable.

Claims

A hydraulic expansion formula PDC reamer it be by protection joint [1]; main body [9]; push rod [7]; nozzle [6]; pressure regulation shaft bar [2]; pressure regulation bar [3]; piston [4]; spring [8]; sealing ring [5]; reaming hole wing [11]; PDC cutting teeth [12] bearing pin [10]; limited block [13]; fastening bolt [14]; cleaning astern nozzle parts such as [15] forms; it is characterized in that push rod [7] top links to each other also with piston [4] and spring [8] sets at main body [9] inner chamber; pressure regulation bar [3] top is fixed on the pressure regulation shaft bar [2] by thread connection; nozzle [6] is inserted in the bottom; pressure regulation shaft bar [2] is sat and is placed on the step on main body [9] top; reaming hole wing [11] is the multiple edge body of uneven thickness; on; lower end one side is provided with boss; PDC cutting teeth [12] is equipped with in reaming hole wing [11] bottom; and be fixed on main body [9] middle part by bearing pin [10]; compression retracting spring [8]; make the cannelure of push rod [7] middle and lower part catch on the boss on reaming hole wing [11] top; reaming hole wing [11] is tightened in main body [9]; limited block [13] is fixed on the bottom of main body [9] by fastening bolt [14]; in reaming hole wing [11] one sides; the bottom of main body [9] is equipped with cleans astern nozzle [15], and protection joint [1] links to each other by screw thread with main body [9].
2. a kind of hydraulic expansion formula PDC reamer according to claim 1 is characterized in that the upper and lower part diameter of pressure regulation bar [3] is thin, and the middle part diameter is thicker, and middle part and bottom are made as the bullet transition.
3. a kind of hydraulic expansion formula PDC reamer according to claim 1 is characterized in that push rod [7] is the reducing cylinder, and the centre is provided with a through hole, and the upper and lower part diameter is thin, and the middle part diameter is thicker, and the middle and lower part is provided with a cannelure.