CN2720087Y

CN2720087Y - Diameter-changing centering guide

Info

Publication number: CN2720087Y
Application number: CN 200420053321
Authority: CN
Inventors: 魏学成; 徐敬熬
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-08-21
Filing date: 2004-08-21
Publication date: 2005-08-24
Anticipated expiration: 2014-08-21

Abstract

The utility model discloses a diameter-changing centering guide, comprising a spring lamination, a rung, a sliding male pin and a safety pin. The structure of the rung is circular ring. The rung comprises multiple slice expansion blocks. Both ends of every slice expansion block are equipped with the rectangular tank. A flat hole joint is processed on one end of the expansion block, and a circular hole joint is processed on the other end. At the same time, the safety pin hole which is perpendicular to the axis direction of the centering guide is arranged on every slice expansion block. The flat hole joint and the circular hole joint between two slice expansion blocks are crisscross vertically stacked together. The flat hole joint is connected with the circular hole joint in series though the sliding male pin, forming a circular ring rung. Two slice expansion blocks are locked in the relative position when the safety pin passing two safety pin holes between two slice expansion blocks. The utility model makes the centering guide rung continuously expand and expand the diameter to the design dimension, and the centering guide rung isn't break, making use of clipping the safety pin under the stress and the sliding male pin sliding. The utility model is the ideal centering guide for the expansion type casing tube.

Description

A kind of reducing centralizer

Technical field the utility model relates to a kind of centralizer, especially a kind of reducing casing stabbing board.

The background technology casing stabbing board is to make sleeve pipe important means placed in the middle in well in the drilling completion operation, and cement paste evenly is set in the annular space of the sleeve pipe and the borehole wall, thereby guarantees cementing quality.Casing stabbing board mainly contains rigidity centralizer and elastic centralizer two big classes at present.The rigidity centralizer is an integral structure, and its body can not be by deflection, and its diameter is a steady state value, can not change.Elastic centralizer is made of the hoop at two ends and the arcuate bombing leaf of difformity and quantity, and the elastic deformation of definite shape can take place the arcuate bombing leaf of elastic centralizer, but the hoop at its two ends can not change directly through being a steady state value.In the later stage nineties 20th century, Shell Co. Ltd at first develops the expansion sleeve technology, three families that mainly contain of ripe bulged tube technology and product is arranged in the world: Eventure Universal Tech. Corp., ETECH company and Petroline company at present.So-called expansion sleeve is exactly a kind of mild steel sleeve pipe, can use machinery or hydraulic way, and by applying pulling force or pressure makes casing expandable, the generation permanent plastic deformation makes its diameter become greater to another kind of size from a kind of size.At expansion tube, external (Weatherford company) designed a kind of new-type elastic centralizer, and the hoop at two ends connects with pin, and during casing expandable, the hoop pin is cut off under certain pulling force, and centralizer is opened.Though this centralizer has solved the problem that casing stabbing board can not expand with sleeve pipe, it is bad that it sets upright effect.Because after pin is cut off, hoop splits and becomes discontinuous hoop, can not hold sleeve pipe fully, and casing stabbing board does not have the effect of setting upright sleeve pipe at the breach place.

The summary of the invention the purpose of this utility model is a kind of reducing centralizer of design, the technical problem of the continuous reducing of centralizer during with solution drill holder tube swelling.The utility model is to realize like this, a kind of reducing centralizer, it comprises spring leaf, hoop, sliding pin, safety pin, hoop is a circular ring, hoop is made up of the multi-disc expanding block, the two ends of every expanding block all have rectangular channel, one end of expanding block is processed with flat poroid connector, the other end is processed with the circular hole connector, is having safe pin-and-hole on the every expanding block on perpendicular to the centralizer axis direction simultaneously, and flat poroid connector is in the same place with the staggered vertical pile of circular hole connector between two expanding blocks, sliding pin is serially connected flat poroid connector and circular hole connector, forms a circular hoop; Safety pin passes the safe pin-and-hole between two expanding blocks, with two expanding block locking relative positions.Flat poroid connector is the flat cellular type connector of ellipticity or circular arc.On hoop, have spring leaf braiding hole, spring leaf can be riveted on two hoops easily, thereby constitute a complete centralizer.Spring leaf also can be connected by welding on the hoop.Hoop in the utility model can be implemented under certain pulling force and expand along with the expansion of sleeve pipe, and the most important point is that hoop keeps continuously in expansion process always, do not rupture, thereby the assurance centralizer is tightly encircled sleeve pipe always, plays centralizing function effectively.

Description of drawings Fig. 1 is a structural representation of the present utility model

Fig. 2 is a vertical view of the present utility model

Fig. 3 is the elevation of expanding block in the utility model

Fig. 4 is the vertical view of expanding block in the utility model

1-hoop among the figure; The 2-arcuate bombing leaf; The 3-safety pin; The 4-sliding pin

The specific embodiment is with reference to accompanying

drawing

1,2,3,4, a kind of reducing centralizer of the utility model, it comprises hoop, arcuate bombing leaf, safety pin and sliding pin, hoop is made up of five expanding blocks, expanding block is the circular arc laminated structure, have rectangular channel at its two ends, every expanding block one end is processed with three flat cellular type connector of ellipticity, the other end is processed with two circular hole connectors, between two expanding blocks, connector inserts in the other side's the rectangular channel, sliding pin is serially connected flat cellular type connector of ellipticity and circular hole connector, four diagonal angles at every expanding block have four safe pin-and-holes, and safety pin passes the safe pin-and-hole of two expanding blocks, with the locking position between the expanding block.Safety pin is cut off when casing expandable like this, and sliding pin slides in the flat cellular type connector of ellipticity, makes between two expanding blocks to slide relatively, and the diameter of hoop expands the size of design to thereupon, and still is connected as a single entity between the expanding block.On expanding block, have spring leaf braiding hole, arcuate bombing leaf is put into wherein riveted, just formed a solid and reliable reducing centralizer.

Claims

1, a kind of reducing centralizer, it comprises spring leaf, hoop, sliding pin, it is characterized in that hoop is a circular ring, hoop is made up of the multi-disc expanding block, the two ends of every expanding block all have rectangular channel, one end of expanding block is processed with flat poroid connector, the other end is processed with the circular hole connector, simultaneously on perpendicular to the centralizer axis direction, having safe pin-and-hole on the every expanding block, flat poroid connector is in the same place with the staggered vertical pile of circular hole connector between two expanding blocks, and sliding pin is serially connected flat poroid connector and circular hole connector, forms a circular hoop; Safety pin passes the safe pin-and-hole between two expanding blocks, with two expanding block locking relative positions.

2, a kind of reducing centralizer according to claim 1 is characterized in that described flat poroid connector is the flat cellular type connector of ellipticity.

3, a kind of reducing centralizer according to claim 1 is characterized in that described flat poroid connector is the flat cellular type connector of circular arc.

4, a kind of reducing centralizer according to claim 1 is characterized in that described each hoop is made up of five expanding blocks.