CN2131969Y

CN2131969Y - Floating ball self-loading liquid floating hoop

Info

Publication number: CN2131969Y
Application number: CN 92227720
Authority: CN
Inventors: 吴仲根; 杭忠俊; 顾业成
Original assignee: Drilling Co of Sinopec Jiangsu Petroleum Exploration Bureau
Current assignee: Drilling Co of Sinopec Jiangsu Petroleum Exploration Bureau
Priority date: 1992-07-20
Filing date: 1992-07-20
Publication date: 1993-05-05
Anticipated expiration: 2002-07-20

Abstract

The utility model relates to a floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well. The floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well is mainly composed of a shell body, a ball seat, a nylon ball, and a ball blocking plate. The floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well is improved on the basis of the existing self-pouring liquid floating hoop. The floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well is characterized in that a pin cutting sleeve, a pulp pouring claw, and a porous sleeve shape ball blocking structure are arranged inside the ball seat. The floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well has the advantages of simple structure and reliable work. The floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well can automatically pour liquid in the process of bushing arranging. After a well is fixed, the floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well plays the function of a non-return valve. The outstanding feature of the floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well is that the floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well carries out positive and reverse circulation in the process of the bushing arranging. After the floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well circulates, the self-pouring performance can not be influenced. The floating ball type self-pouring liquid floating hoop used for arranging a bushing and fixing a well provides a powerful method for treating a complex condition appearing under the well.

Description

Floating ball self-loading liquid floating hoop

The utility model relates to the float-ball type self-loading liquid float collar of a kind of setting of casing and well cementation usefulness.

At present, in well, be lowered to sleeve pipe,, reduce down-hole accident, improve the shaft building quality, carry out production strictly in line with rules and regulations,, can irritate liquid voluntarily during setting of casing, play the non-return valve action during well cementation so, adorn a self-loading liquid float collar in the casing string lower end in order to save grouting time.The present all kinds of self-loading liquid float collars that use, as " differential sleeve pipe automatic grouting equipment " with " thin board type automatic grouting valve " etc., but there is following deficiency in these devices: the one, and poor reliability, the passage aperture is little, easily stopped up by the down-hole foul, or circulation resistance is excessive, and the self-loading liquid adjustment structure is damaged easily; The 2nd, part self-loading liquid float collar midway can not circulating mud at setting of casing, perhaps can circulate, but complex structure; The 3rd, after finishing, well cementation want float collar to play the effect of back-pressure valve, wherein also need carry out the pitching operation, increased the operation of operation.

The purpose of this utility model provide a kind of simple in structure, use reliable, setting of casing just carrying out midway or anti-circulating mud after all can keep from the float collar of irritating performance.

The purpose of this utility model is achieved in that float-ball type self-loading liquid float collar, mainly by housing 1, cut off cover 2, ball seat 3, grouting pawl 5, nylon ball 6 and kick back 7 and form, in its ball seat 3, be equipped with stretch out its upper surface cut off the cover 2, cut off the cover 2 upper end sidepieces be drilled with relief hole; The lower inside of ball seat 3 is provided with multi-disc grouting pawl 5, and grouting pawl 5 upper ends are supported and cut off cover 2, and the lower end is provided with nylon ball 6 and kick back 7, and kick back 7 is for having " protruding " word shape tube-in-tube structure of porous eye.In the setting of casing process, can irritate liquid voluntarily, after the well cementation, play the non-return valve action.The outstanding characteristics of this float collar also are to carry out positive and negative circulation in the setting of casing process, do not influence after the circulation from irritating performance.

The utlity model has simple in structure, easy to adjust, use reliable, not only can irritate liquid voluntarily in the setting of casing process, this prevents from the setting of casing process stratum to be produced surge pressure or " piston " effect to head of liquid under the control well, reduce the generation of down hole problem, and improve cementing quality and be of great benefit to, and in the speed that improves casing job, improving working conditions, reducing labor intensity also has remarkable result.Following 2000 meters sleeve pipe, can save about 3 hours manual grouting time, the outstanding feature of this float collar also is can carry out in the setting of casing process direct circulation or anti-circulation, after circulating, self-loading liquid performance to this float collar is had no effect, thereby the complex situations that occur for the processing down-hole provide strong means.

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

Fig. 2 is Figure 1A-A sectional view.

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

With reference to accompanying drawing 1, in ball seat 3, be equipped with stretch out its upper surface cut off the cover 2, be fixed in the lower inside of ball seat 3 with distributions such as the pawls 5 that respectively multi-disc is in the milk with pin 4, end bearing cuts off cover 2 on the grouting pawl 5, following end bearing nylon ball 6, in the sealing surface formation gap of nylon ball 6 with ball seat 3, this gap pours in the sleeve pipe mud in the well voluntarily in the setting of casing process.In addition, be drilled with relief hole cutting off cover 2 upper end sidepieces, its effect is such: when well cementation replaces cement paste, it is descending that displacement fluid promotes plug, when plug run into cut off cover 2 after,＜be bruising relief hole is arranged owing to cut off cover on 2, making plug can continue to cut off cover 2 down pushes away, till plug was run into ball seat 3, at this moment, pin 4 was cut off, grouting pawl 5 comes off, and the sealing surface of ball seat 3 all exposes.After well cementation finishes, nylon ball 6 come-ups, seat plays the non-return valve action on the sealing surface of ball seat, prevent that cement paste from pouring in down a chimney.When needing direct circulation mud in the setting of casing process, the eyelet of mud through cutting off cover 2, kick back 7 flows out.The situation that flows to such as self-loading liquid situation that anti-circulation time mud enters float collar are identical.In order to reduce circulation resistance, prevent that the obstruction of self-loading liquid or anti-circulation time down-hole foreign material from lost efficacy float collar, so kick back is made the tube-in-tube structure of " protruding " word shape, all be drilled with many through holes at top and side, make its discharge area surpass the discharge area that cuts off cover 2.

With reference to Fig. 1, ball seat 3 usefulness screw threads are connected with steel housing 1 top, and ball seat 3 lower ends have 5 * 45 ° of chamferings to make sealing surface.The cover 2 that cuts off that is contained in ball seat 3 the insides has an outer shoulder to peak at the interior shoulder places of ball seat 3, make ball seat 3 bear irritate voluntarily liquid or anti-circulation time nylon ball 6 on top power.Grouting pawl 5 is advisable with 3 in force, and its cross section is curved, and outer garden arc dia matches thick 5～8mm, wide 12～18mm with the internal diameter that ball seat 3 places are installed.Be drilled with the hole on the grouting pawl 5, with pin 4 it evenly be fixed in to cut off and overlap 2 times inboards.Pin 4 diameters are 4 to 6mm, regulate the size in the gap between the sealing surface of nylon ball 6 and ball seat 3 with the length of grouting pawl 5, can satisfy the requirement of different filling speeds.This method is easy.In order to guarantee to cut off cover 2 pin 4 is cut off, required to cut off cover 2 length of stretching out ball seat 3 and be preferably 4 to 10 times of pin 4 diameters.Kick back 7 usefulness screw threads link to each other with housing 1 bottom, and the distance of its top to ball seat 3 lower ends is 1 to 2 times of nylon ball 6 diameters.In order to make float collar that good drillability be arranged, the material that cuts off cover 2, ball seat 3 and kick back 7 can adopt alloy aluminum or cast iron.

Claims

1, the float-ball type self-loading liquid float collar of a kind of setting of casing and well cementation usefulness, mainly by housing 1, cut off cover 2, ball seat 3, nylon ball 6 and kick back 7 and form, it is characterized in that being equipped with in the ball seat 3 stretch out its upper surface cut off the cover 2, the lower inside of ball seat 3 is provided with multi-disc grouting pawl 5, grouting pawl 5 upper ends are supported and are cut off cover 2, and the lower end is provided with nylon ball 6 and kick back 7.

2, float-ball type self-loading liquid float collar according to claim 1 is characterized in that kick back 7 for having " protruding " word shape tube-in-tube structure of porous eye, and its discharge area is greater than the discharge area that cuts off cover 2.

3, float-ball type self-loading liquid float collar according to claim 1 and 2 is characterized in that cutting off cover 2 length of stretching out ball seat 3 and is 4 to 10 times of pin 4 diameters.

4, float-ball type self-loading liquid float collar according to claim 3, it is characterized in that cutting off cover 2 has an outer shoulder to peak at shoulder place in the ball seat 3.

5, float-ball type self-loading liquid float collar according to claim 4 is characterized in that cutting off cover side, 2 upper end and is provided with relief hole.

6, float-ball type self-loading liquid float collar according to claim 5, the pawl 5 that it is characterized in that being in the milk is 3.