CN2614264Y

CN2614264Y - Ultra deep well float collar and float shoe

Info

Publication number: CN2614264Y
Application number: CN 03250927
Authority: CN
Inventors: 冯永江; 孙薇; 郭庆海
Original assignee: Daqing Petroleum Administration Bureau
Current assignee: Daqing Petroleum Administration Bureau
Priority date: 2003-04-29
Filing date: 2003-04-29
Publication date: 2004-05-05
Anticipated expiration: 2013-04-29

Abstract

A floating hoop and shoes for ultra deep wells substantially solves the problems of poor temperature resistance, pressure resistance and corrosion resistance, easy to produce leakage and be broken of the existing valve bodies and core bodies. The utility model is characterized in that an upper core body (4) is internally locked with a spherical watchband groove and a check valve (7) of a valve rod (6), wherein the inside of the groove is clamped with a rubber cushion (1), the check valve (7) is connected with a valve rod coating (9) in a lower core body (5) through the valve rod (6) and a spring (8). The utility model has the advantages of high temperature resistance, high pressure resistance and good high corrosion resistance.

Description

Ultradeep well float collar float shoe

Technical field:

The utility model relates to the used float collar in reinforcing oil well field, float shoe, especially ultradeep well float collar float shoe.

Background technology:

Crucial operation together---well cementation is arranged in the drilling engineering, all will be applied to well cementation to completion from the beginning drilling well.The key link of casing and cementing is to inject cement job, it is the cement paste of oil well cement preparation becoming with pumpability with standard, replace the ad-hoc location of delivering to the annular space between pit shaft and the sleeve pipe by hole on the sleeve pipe, and then operations such as sealing oil-gas Layer or bad ground.And float collar, float shoe is to be used for a kind of device that the guide sleeves tubing string is gone into well smoothly, adjust the suffered buoyancy of casing string, prevent during well cementation that cement from flowing backwards back in the sleeve pipe, accurately control cement plug height in the sleeve pipe, when well cementation, need between sleeve pipe, to connect float collar, on the foot sleeve pipe, connect float shoe, and present used float collar, the float shoe structure is to adopt the form of sulfuration sticking rubber on the ball-and-seat substantially, at downhole temperature, when pressure height and environment are abominable, rubber pad sulfuration distortion or damage in the valve body, lose sealing function, having is exactly existing float collar again, the well depth that float shoe was suitable for is in 3000, simultaneously because existing core body material is cast aluminium or nylon, because of conditions down-hole abominable, corrosion easily, the corrosion back produces the slag inclusion phenomenon, has in for a long time big again discharge capacity mud circulation process to produce seepage or damage phenomenon, influences cementing quality, the waste material raises the well cementation cost.

The utility model content:

In order to overcome existing valve body and core body heatproof, withstand voltage and corrosion-resistant, easily produce the deficiency of seepage and damage, the utility model provides a kind of ultradeep well float collar float shoe, and this ultradeep well float collar float shoe has high temperature resistant, the characteristics of high pressure resistant and good corrosion resistance.

The technical solution of the utility model is: this ultradeep well float collar float shoe comprises housing, last core body, following core body and single current valve seat, be fixed with single current valve seat, last core body and following core body successively by cement under the housing, block the ball-and-seat that ball watchband groove and valve rod are arranged in the last core body mutually, mounting board has rubber pad in its groove, and ball-and-seat links to each other with following core body inner valve stem cover by valve rod and spring.

The beneficial effect that the utlity model has is: owing to be fixed with ball-and-seat, valve rod, spring and valve stem sleeve in the ultradeep well float collar float shoe core body, and ball-and-seat recessed in mounting board to have be the rubber of erosion resistance, corrosion-resistant, high temperature resistant, high pressure material, substitute in the past cast aluminium and nylon, making it intensity increases, especially effect is better under the deep-well of 3000-8000 rice, so not yielding and damage when high pressure, high temperature.

Description of drawings:

Accompanying drawing 1 is the utility model float collar structure sectional view;

Accompanying drawing 2 is the utility model float shoe sectional views.

1-rubber pad among the figure, 2-housing, 3-single current valve seat, the last core body of 4-, core body under the 5-, 6-valve rod, 7-ball-and-seat, 8-spring, 9-valve stem sleeve.

The specific embodiment:

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

By Fig. 1 in conjunction with shown in 2, this ultradeep well float collar float shoe comprises housing 2, last core body 1, following core body 5 and single current valve seat 3, housing 2 times is fixed with single current valve seat 3 successively by cement, last core body 4 reaches core body 5 down, block the ball-and-seat 7 that ball watchband groove and valve rod 6 are arranged in the last core body 4 mutually, mounting board has rubber pad 1 in its groove, simple in structure being convenient to like this processed, the rubber pad 1 of interior mounting board, have shock-resistant, corrosion-resistant, high temperature resistant, the rubber of high pressure material, substitute in the past cast aluminium and nylon, make it intensity, not fragile, and good sealing effect, the ball-and-seat assembly formed, ball-and-seat 7 hour is placed restrictions on the cement of shaft bottom anti-, especially high temperature resistant under 3000-8000 rice deep-well at last end pressure, high pressure resistant better effects if; Ball-and-seat 7 links to each other with play core body 5 inner valve stem cover 9 by valve rod 6 and spring 8, makes valve rod 6 to move up and down in the valve stem sleeve of fixing 9, the assurance flexible motion, and when down-hole pressure is big, injection pressure hour, ball-and-seat 7 can restore automatically.

During actual the use, float shoe is connected sleeve pipe bottom, float collar be connected with the float shoe adjacent bushings on, can normally use.

Claims

1, a kind of ultradeep well float collar float shoe, comprise housing (2), last core body (4), following core body (5) and single current valve seat (3), be fixed with single current valve seat (3), last core body (4) and following core body (5) successively by cement under the housing (2), it is characterized in that: go up and block the ball-and-seat (7) that ball watchband groove and valve rod (6) are arranged in the core body (4) mutually, mounting board has rubber pad (1) in its groove, and ball-and-seat (7) links to each other with following core body (5) inner valve stem cover (9) by valve rod (6) and spring (8).