CN2450367Y

CN2450367Y - Hydraulic reduced drilling tool stabilizer

Info

Publication number: CN2450367Y
Application number: CN 00244252
Authority: CN
Inventors: 孙起昱; 聂军; 胡春梅; 赵希军; 张爱华
Original assignee: Drill Machinery Instrument And Meter Tech Inst Zhongyuan Oil Exploration Bure
Current assignee: Drill Machinery Instrument And Meter Tech Inst Zhongyuan Oil Exploration Bure
Priority date: 2000-08-04
Filing date: 2000-08-04
Publication date: 2001-09-26
Anticipated expiration: 2010-08-04

Abstract

The utility model discloses a hydraulic stabilizer for a drilling tool with changeable diameter, which is composed of a hollow spiral columnar body, wherein small holes are uniformly distributed on three spiral lines on the body, and plunger piston seats and plunger pistons are arranged on the inner ends of the interiors of the holes. Piston sleeves which are arranged on the outer ends of the interiors of the holes are connected with the body by threads, and supporting pistons are sheathed in the piston sleeves. Reset springs are arranged between the piston sleeves and the supporting pistons, and the plunger piston seats are tightly pressed by the piston sleeves which are fixed by positioning screws. Through tests, compared with a regular stabilizer for a drilling tool, the mechanical drilling speed of the utility model is improved by 5 %, time for taking off a drilling tool is shortened by 10 %, the quality of a well body is improved by more than 10 %, and the period for building a well is shortened by 5 %.

Description

Fluid power reducing drilling tool stabilizer

The utility model relates to a kind of drilling tool stabilizer, belongs to the drilling well downhole tool.

Domestic drilling tool stabilizer mainly contains two kinds at present; A kind of is the remote control reducing drilling tool stabilizer of being developed by exploration and development academy of ancestral petroleum natural gas parent company, better economic benefit, but complex structure, and reliability is relatively low, and costs an arm and a leg, and is unsuitable for large scale application; Another kind is but that it is easy and simple to handle, moderate by the simple and easy reducing drilling tool stabilizer of long celebrating oil field drilling institute development, but Seal Design is undesirable, and seepage often takes place, so reliability is not high, is further improved.The remote control reducing drilling tool stabilizer of foreign study generally is by changing the flexible of the pressure of the drill control wiper block, utilize pump pressure to carry out the fluid power locking, complex structure, with high costs, Operation and Maintenance is difficult, reliability is also relatively poor.

The purpose of this utility model just provides a kind of fluid power reducing drilling tool stabilizer, and it can stablize, control drilling tool effectively.

The purpose of this utility model is achieved in that fluid power reducing drilling tool stabilizer is poor by drilling liquid pressure in the drilling tool in the drilling process and annular pressure, make support piston extend out to the reservation size, after the termination of pumping, under the effect of back-moving spring, the support piston automatic drawing back.It is made up of the body of cored screw column, on three helixes on the body, be evenly equipped with aperture, the inner is provided with plunger mat in the hole, it is fixed by pin and body, plunger is housed in the plunger mat, and the outer end in the hole has piston bush to be threaded with body, is with support piston in the piston bush, between piston bush and support piston back-moving spring is housed, piston bush hold-down column obturating plug is also fixed by dog screw.The support piston top is a cylindrical surface, and tungsten carbide button's piece.

The utility model is in drilling process, the stabilizer external diameter increases to certain size automatically, and real the realization met the eye on every side drilling well, and the hole deviation probability when making drilling straight-hole reduces greatly, and the pressure of the drill can be further enhanced, thereby the raising rate of penetration, when removing drill string, the work plane of stabilizer is regained in the body, diameter diminishes, can improve round trip efficient, reduce down-hole accident, reduce drilling cost.

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

Fig. 1: Facad structure figure of the present utility model; The A-A of Fig. 2: Fig. 1 is to sectional view; 1-body, 2-pin, 3-plunger, 4-" Yx " RunddichtringO, 5-" O " RunddichtringO, 6-plunger mat, 7-pin, 8-piston, 9-hard alloy blocks, 10-spring, 11-piston bush among the figure;

As shown in Figure 1 and Figure 2, fluid power reducing drilling tool stabilizer is made up of the body 1 of cored screw column, on three helixes on the body 1, be evenly equipped with aperture, the inner is provided with plunger mat 6 in the hole, and it is fixing with body 1 by pin 2, and plunger 3 is housed in the plunger mat 6, outer end in the hole has piston bush 11 to be threaded with body 1, be with support piston 8 in the piston bush 11, between piston bush 11 and support piston 8 back-moving spring 10 be housed, piston bush 11 hold-down column obturating plugs 6 are also fixing by dog screw 7.Support piston 8 tops are cylindrical surface, and are inlaid with hard alloy blocks 9.

The top of during use fluid power reducing drilling tool stabilizer being equipped with drill collar, drilling fluid by drill string via bit nozzle, the bottom-hole cleaning, the cooling drill bit, the annular space by drilling rod and well is circulated to ground then.Generally speaking, the pressure drop of bit nozzle has 2-3MPa at least, under the effect of stabilizer inside and outside differential pressure, plunger promotes support piston, makes the support piston compression reseting spring, and is protruding, position by the positioning step on the piston bush, make overhanging size Control in preliminary dimension.After the termination of pumping, the stabilizer inside and outside differential pressure disappears, and under the effect of back-moving spring, support piston is withdrawn in the body automatically, makes the effect external diameter minimum of stabilizer.The utility model is simple in structure, easy to use, reliability is high, cheap, in routine and directed drilling operation, replace conventional stabilisers, not only increase the rigidity of bottomhole assembly, reach the purpose of stablizing hole deviation and orientation, through overtesting, the more conventional drilling tool stabilizer rate of penetration of the utility model improves 5%, shortens the trip time more than 10%, improve wellbore quality more than 10%, shorten well construction period 5%.

Claims

1, a kind of fluid power reducing drilling tool stabilizer, body (1) by the cored screw column is formed, it is characterized in that: on three helixes on the body (1), be evenly equipped with aperture, the inner is provided with plunger mat (6) in the hole, it is fixing by pin (2) and body (1), plunger (3) is housed in the plunger mat (6), outer end in the hole has piston bush (11) to be threaded with body (1), be with support piston (8) in the piston bush (11), between piston bush (11) and support piston (8) back-moving spring (10) is housed, piston bush (11) hold-down column obturating plug (6) is also fixing by dog screw (7).

2, fluid power reducing drilling tool stabilizer according to claim 1 is characterized in that: support piston (8) top is a cylindrical surface, and tungsten carbide button's piece (9).