CN2851503Y

CN2851503Y - Hydraulic automatic anti-deflection drilling tools

Info

Publication number: CN2851503Y
Application number: CN 200520128680
Authority: CN
Inventors: 宋执武
Original assignee: China University of Petroleum Beijing
Current assignee: China University of Petroleum Beijing
Priority date: 2005-10-09
Filing date: 2005-10-09
Publication date: 2006-12-27
Anticipated expiration: 2015-10-09

Abstract

The utility model relates to a hydraulic automatic anti-deflection drilling tool which solves the problem of bad anti-deflection capability of the existing drilling tool. The utility model is characterized in that a cylindrical eccentric block is hung outside a drill collar body by the connection of a steel ball, one half of the eccentric block is thick and the other half of the eccentric block is thin, the lower parts of two halves are not on the same surface and are provided with a dummy club and a concave table, a valve cavity is arranged on the drill collar body, a valve rod which is supported at the lower end part of the eccentric block by a spring is arranged in the valve cavity, a small hole is communicated with ring space, another small hole is communicated with the inner part of the drill collar body and a piston rod extends outside the drill collar body. The drilling tool is at a high edge position at the time that a well deflection angle reaches a certain valve to have hydraulic force to generate reduction deflection force to act on a drill bit once to quickly decrease down well deflection when the drill collar body is rotated in one circle according to a tumbler principle and a jack principle.

Description

Hydraulic pressure automatic anti-oblique drilling tool

Technical field:

The utility model relates to the used drilling tool in oil drilling field, has realized that especially drilling tool itself utilizes hydraulic coupling to prevent the hydraulic pressure automatic anti-oblique drilling tool of well deflection automatically.

Background technology:

Drilling well is the basic means of subterranean resource exploration and developments such as petroleum gas, and the straight well deviation control with drilling straight well is one of technical barrier of often running into of situ of drilling well.When beating straight well, if hole deviation is excessive, can make well depart from underground design object, upset the layout of oil-gas field development.In inclined shaft, drill string easily leans against the borehole wall one side, and serious friction takes place during rotation, easily makes the drill string wearing and tearing and fractures, and also may cause accidents such as cave-in and key-seating sticking.Hole deviation exceeds standard also can influence cementing quality.Hole deviation is crossed normally the carrying out of separate zone production, water filling work that conference directly influences the down-hole, and pumpingh well is also often caused the wearing and tearing of oil pipe and sucker rod and fractures.So the exploration and development that hole deviation exceeds standard to oil gas field all has very big harm.And present drilling tool because the drop angle power of its generation is too little, can not satisfy anti-oblique requirement at some block.

The utility model content:

The utility model provides a kind of hydraulic pressure automatic anti-oblique drilling tool, and this drilling tool can utilize hydraulic pressure strength to produce drop angle power automatically, thereby has prevented the deflection of well.

The technical solution of the utility model is: this hydraulic pressure automatic anti-oblique drilling tool comprises the drill collar body, by the connection of steel ball, is hung with the column eccentric block at the external face of drill collar, this eccentric block half thick half is thin, and its bottom is not in one plane, and boss and concave station are arranged.On the drill collar body, valve pocket is arranged, in valve pocket, have valve rod to withstand on the eccentric block bottom, have aperture A to communicate, have aperture B to communicate, have the extended drill collar body of piston rod external with drill collar inside with annular space by spring.

The beneficial effect that the utlity model has is: when hole angle surpasses a certain value, eccentric block can stop, at this moment piston rod can (not have hydraulic coupling during on low limit stretching out during at the well flash under the effect of hydraulic coupling, so can be kick-backed by the borehole wall), withstand on the borehole wall, push drill bit to low limit, thereby can very fast hole deviation be lowered.

Description of drawings:

Fig. 1 is the utility model structure sectional view;

Fig. 2 is the expansion shape of eccentric block lower end;

Fig. 3 is the enlarged drawing at valve pocket position.

1-drill collar body among the figure, 2-steel ball, 3-eccentric block, 4-valve rod, 5-spring, 6-aperture A, 7-valve pocket, 8-piston rod, 9-aperture B, 10-set bolt.

The specific embodiment:

Below in conjunction with accompanying drawing will the utility model is described in further detail:

By shown in Figure 1, this hydraulic pressure automatic anti-oblique drilling tool comprises drill collar body 1, by the connection of steel ball 2, is hung with column eccentric block 3 in drill collar body 1 outside, this eccentric block 3 half thick half is thin, and its bottom is not in one plane, boss and concave station is arranged, as shown in Figure 2.Valve pocket 7 is arranged on drill collar body 1, in valve pocket 7, there is valve rod 4 to withstand on eccentric block 3 bottoms, has aperture A6 to communicate, have aperture B9 to communicate with drill collar body 1 inside with annular space by spring 5, there is the extended drill collar body of piston rod 81 external, is fixed on the drill collar body 1 by set bolt 10.

Because eccentric block 3 links to each other with drill collar body 1 by steel ball 2, so when 1 rotation of drill collar body, it can be with 1 rotation of drill collar body.Because to be half thick that half is thin for eccentric block 3,, so its center of gravity is not on drill collar body 1 center line.When hole angle was very little, it can be under the effect of frictional force, slowly rotation; When hole angle reaches certain value, when eccentric block 3 weight components had surpassed the total frictional force of system, according to roly-poly principle, it will stop, and webbing is on the low limit of well, and featheredge is at the flash of well, no longer rotation.Valve rod 4 is fixed on the drill collar body 1, so it can be along with drill collar body 1 rotates together.Its upper end withstands on the bottom of eccentric block 3 by spring 5, because rotation among them, one is not rotated, so can take place between them to slide relatively.Because the bottom of eccentric block 3 is not in one plane, but as shown in Figure 2, boss and concave station is arranged, so when taking place to slide between them, valve rod 4 also has upper and lower axially-movable and takes place.When valve rod 4 concave station (we are placed on concave station on the featheredge of eccentric block 3 because featheredge is on the well flash, so this moment valve rod 4 also on flash) when going up, it is on the top of valve pocket 7, this moment, it can be blocked aperture A6, was not communicated with valve pocket 7, and allowed aperture B9 be communicated with valve pocket 7.Because the pressure in the drill collar body 1 is higher than the pressure at annular space place, according to the jack principle, it is external that piston rod 8 will stretch out drill collar, withstands on the borehole wall, pushes drill bit to low limit, realizes the drop angle effect.When valve rod 4 boss (we are placed on boss on the webbing of eccentric block 3 because webbing is on the low limit of well, so this moment valve rod also on low limit) when going up, it is in the bottom of valve pocket 7, this moment, it can be blocked aperture B9, was not communicated with valve pocket 7, and allowed aperture A6 be communicated with valve pocket 7.This moment, the pressure on piston rod 8 two sides was identical, did not have action of hydraulic force on it, and it will be kick-backed by the borehole wall.So whenever rotate a circle when drill collar body 1, the drop angle masterpiece that will have hydraulic coupling to produce at the flash place is used on the drill bit once, and under the effect of this periodicity drop angle power, hole deviation can lower very soon.

Claims

A kind of hydraulic pressure automatic anti-oblique drilling tool, it comprises drill collar body (1), connection by steel ball (2), be hung with column eccentric block (3) in drill collar body (1) outside, this eccentric block (3) half thick half is thin, and its bottom is not in one plane, boss and concave station are arranged, valve pocket (7) is arranged on drill collar body (1), in valve pocket (7), there is valve rod (4) to withstand on eccentric block (3) bottom, has aperture A (6) to communicate, have aperture B (9) to communicate with drill collar body (1) inside with annular space by spring (5), there is the extended drill collar body of piston rod (8) (1) external, is fixed on the drill collar body (1) by set bolt (10).