CN2058425U - Navigation drill short joint for underwell motor - Google Patents

Abstract

The utility model relates to a navigation well drilling short joint for under well motor used for the well drilling of the oilfield. The utility model is characterized in that a connecting structure of a ball palm and a ball head is adopted between an upper joint and a lower joint, and the both sides of the ball palm are separately provided with a chute. The upper joint and the lower joint are connected by a pin, forming a novel crotch-type universal joint to transfer the torque and the revolution rate which are created by the under well motor. Additionally, a sealing capsule is provided to make the ball palm and the ball head of the upper joint and the lower joint work in the oil-filled sealing capsule. Consequently, the under well motor provided with this short joint can realize the purpose of drilling from the straight-well section to the incline-well section and then to the stable incline-well section without taking off the drill to change the combination of drill tools.

Description

Navigation drill short joint for underwell motor

The utility model relates to a kind of for oil drilling, particularly bores the navigation drilling well pipe nipple of the used down-hole motor of directional well.

In oil exploration and production drilling engineering, particularly in boring directional well cluster well engineering, all must use navigation drilling well pipe nipple.Generally when boring the inclination section of directional well, need to change drilling assembly, add and join kick sub.The most frequently used kick sub is the fixed bend joint on the mining site.The fixed bend joint is contained between turbine motor or screw motor and the drill collar, about 10～13 meters apart from the shaft bottom drill bit.Like this, when deflecting angle on the fixed bend joint increases when some slightly, on drill bit, just produce a bigger lateral force and lateral displacement amount, because of bent sub higher apart from the shaft bottom, and the deflecting angle of bent sub can not be done too for a short time, therefore, and during with fixed bend joint deflecting, side load on the drill bit is bigger, and down-hole motor is braked easily.In addition, build angle rate is lower.The down-hole motor of fixed bend joint generally is housed, after having bored inclination section, can not continue down to bore steady lower curved section, and must pull out of hole, change drilling assembly, therefore influenced the complete machine operating efficiency of bit speed and down-hole motor, economic benefit is not high.

Task of the present utility model provides a kind of navigation drilling well pipe nipple of down-hole motor, it is loaded between down-hole motor and the cartridge, bending point is near apart from the shaft bottom, generally have only about 1～2 meter, and angle of bend is very little, general 0.5～0.8 degree that only needs is so can both can bore angle buildup interval under the situation that does not change drilling assembly, can bore steady lower curved section continuously again, have simple in structurely, supporting capacity is big, and moment of friction is little, be easy to start, the build angle rate height is saved drilling time, characteristics such as economic benefit height.

Design main points of the present utility model are: top connection (3) is provided with the ball palm (15) and rectangle chute (14) at the connecting portion with lower contact (8), the connecting portion of lower contact and top connection is provided with bulb (16), bulb forms higher pair with the ball palm and contacts, in order to transmit axial load.Pin (6) is made up of bearing pin (11), slide block (12) and door (13), be used to connect upper and lower two joints, the lower contact sphere centre of unrolling is swung in paper plane, and the lower contact pin face center of unrolling is being swung in vertical paper plane, slide block can slide in rectangular slot, said mechanism has just been formed universal cross and has been connected, as shown in drawings.The output torque of turbine section main shaft (1) is delivered to cartridge main shaft (9) by pin.Other is provided with seal capsule (7), be clamped on respectively on the shoulder of upper and lower joint by clip (5), shoe cream room has been full of lubricating grease in (17), the ball palm of upper and lower joint and bulb are worked in an oil-filled seal capsule, thereby the ball palm and bulb have lubricating condition preferably when underground work, be unlikely the generation dry friction.

The down-hole motor joint of the navigation drilling well pipe nipple of this down-hole motor is housed, does not need the change drilling assembly that makes a trip, just can realize from the straight well section to angle buildup interval and then the continuous rapid drilling of extremely steady lower curved section.When drill string did not change, turbine motor crept into forward with certain build angle rate by the bending direction of the curved shell of navigation drilling well pipe nipple; When drill string rotating, the shell of navigation drilling well pipe nipple also rotates 360 ° thereupon, so lose the deflecting effect, the track that down-hole motor gets out is a straight line.

The navigation drilling well pipe nipple of down-hole motor described in the utility model, its advantage is to compare with the existing fixed bent sub, do not need to change drilling assembly and just can arrive continuously brill angle buildup interval and steady lower curved section by drilled straight well, under the situation of identical deflecting angle, the displacement of drill bit is little, the build angle rate height, moment of friction is little, be easy to start, the damage to the borehole wall when making a trip is little, deflecting reliability height, and it is simple in structure, supporting capacity is big, saves the trip time, the economic benefit height.

Fig. 1 is a general structure schematic diagram of the present utility model.

Fig. 2 is the schematic diagram at the K line of vision pin position of Fig. 1.

Among the figure: (1) is the turbine section main shaft; (2) turbine section shell; (3) top connection; (4) curved shell; (5) clip; (6) pin; (7) seal capsule; (8) lower contact; (9) cartridge main shaft; (10) cartridge shell; (11) bearing pin; (12) slide block; (13) door; (14) rectangle chute; (15) the ball palm; (16) bulb; (17) shoe cream room.

The utility model is described in further detail below in conjunction with accompanying drawing.

This navigation drilling well pipe nipple has only 1-2 rice from the bending point of bending shell (4) to the distance the drill bit of shaft bottom between turbine section and cartridge.The upper end of curved shell links to each other with turbine section shell (2), and the lower end links to each other with cartridge shell (10), and the offset angle of bending shell is 0.5 °, 1 °, 1.5 °, 2 ° etc., can decide according to the specific requirement of drilling technology.Top connection (3) is connected with turbine section main shaft (1), lower contact (8) is connected with cartridge main shaft (9), and the output torque of turbine section and axial hydraulic load pass to the cartridge main shaft through top connection and lower contact.Specific contact pressure between the ball palm (15) and the bulb (16) is very big; and when work also has relatively and slides; especially easily by conquassation or origination point contact fatigue; therefore; two contact surfaces need very high hardness; preferably adopt high abrasion resisting material to make; its contact surface will carry out specially treated; and temper the mud of particle and separate with containing solid phase, and in shoe cream room (17), fill up high-pressure grease with seal capsule (7).Seal capsule in the course of the work, to bear on the one hand and contain acutely washing away of solid phase particles mud, on the other hand, the mud of crossing from the outside high velocity stream of seal capsule forces seal capsule inwardly to be attached on the pin (6), and generation friction with it, make seal capsule produce the damage of breaking easily, influence its sealing effectiveness.Therefore, seal capsule should select for use the fiber rubber of enhancing property to make, and make and keep certain pressure in the fluid sealant blister cavities, basically can keep balance with the pressure of seal capsule outside, avoid the friction between seal capsule and the pin, to prolong the working life of seal capsule.The navigation drilling well pipe nipple of the down-hole motor of making according to the utility model can be realized the purpose of this utility model.

Claims (4)

1, a kind of navigation drilling well pipe nipple of the down-hole motor of being formed by curved shell (4), top connection (3), lower contact (8), the structure that it is characterized in that top connection and lower contact bond sites, what top connection was adopted is the ball palm (15), lower contact.What adopt is bulb (16), makes lower contact form the higher pair contact.

2, the navigation drilling well pipe nipple of down-hole motor according to claim 1 is characterized in that top connection is provided with rectangle chute (14) on the both sides of the ball palm.

3, according to the navigation drilling well pipe nipple of claim 1,2 described down-hole motors, it is characterized in that being provided with the pin of forming by bearing pin (11), slide block (12) and door (13) (6), be used to connect top connection and lower contact, slide block (12) can slide in the rectangle chute of top connection.

4, the navigation drilling well pipe nipple of down-hole motor according to claim 3, it is characterized in that being provided with seal capsule (7), and be clamped on respectively on the shoulder of upper and lower joint by clip (5), shoe cream room fills up lubricating grease in (17), makes the ball palm of upper and lower joint and bulb work in an oil-filled seal capsule.

Images