CN202391354U

CN202391354U - Centralizer

Info

Publication number: CN202391354U
Application number: CN2011203555155U
Authority: CN
Inventors: 李海群
Original assignee: ZHONGTE PETROLEUM EQUIPMENT CO Ltd
Current assignee: ZHONGTE PETROLEUM EQUIPMENT CO Ltd
Priority date: 2011-09-21
Filing date: 2011-09-21
Publication date: 2012-08-22
Anticipated expiration: 2021-09-21

Abstract

The utility model provides a centralizer. The centralizer is pipe-shaped; the pipe wall of the centralizer is provided with through holes vertical to the length direction of the centralizer; centralizing arms which can extend out of the through holes movably are arranged in the through holes; and the centralizing arms are of hollow column body structures, one end of each centralizing arm is communicated with an inner cavity of the centralizer, and the other end of each centralizing arm is closed. According to the technical scheme, after the centralizer enters a well, liquid pressure or gas pressure is applied onto the centralizer; since the centralizing arms are of the hollow column body structures and are communicated with the inner cavity of the centralizer, under the action of pressure, the centralizing arms are pressed out of the through holes; and when all the centralizing arms extend out to abut against the well wall, under the action of pressure, the centralizer and a sleeve can be centralized to the needed position by the centralizing arms.

Description

A kind of centralizer

Technical field

The utility model belongs to drilling well auxiliary equipment field, relates in particular to the technical field of cementing tool.

Background technology

Centralizer is a kind ofly to be widely used in technical fields such as oil drilling through the drilling well aid, in the good well of probing, need be lowered to sleeve pipe and prevent that well from collapsing.In order to make the casing cementing quality good, cement sheath is equally thick all around, so require sleeve pipe to be in the middle of the well; But well often is not vertical, particularly in the horizontal well, because action of gravity; The lower end of sleeve pipe deflection well; Thereby make that sleeve pipe lower end cement sheath is very thin, even do not have cement sheath, this local cementing quality is just bad.So suit centralizer on sleeve pipe helps pipeline to remain in the centre, particularly horizontal well of wellhole.In the prior art, centralizer mainly contains two kinds: rigidity centralizer and elastic centralizer, no matter which kind of, they are mechanical centralizers; What lean on is that the external diameter of the body resistance-strengthening tablets of centralizer makes pipeline away from the borehole wall, reaches the effect of setting upright, if elastic centralizer, the centralizer uprighting force depends on the intensity of spring leaf; Elastic force is big more, and it is good more to set upright effect, but in horizontal well, elastic centralizer elastic force is not enough to hold up pipeline; The effect that very difficult realization is set upright, if the rigidity centralizer is set upright the external diameter that effect depends on body resistance-strengthening tablets, the body resistance-strengthening tablets external diameter is big more; It is good more to set upright effect, but is changing over to the process of horizontal well from peupendicular hole, if external diameter is too big, just more difficult through the corner; Even be stuck in the well, cannot move, if external diameter is too little, because action of gravity; Sleeve pipe can lie in the soffit of the borehole wall, particularly in the middle of the sleeve pipe one section can stick together with the borehole wall, do not reach the effect of setting upright, the cementing quality requirement of arriving like this.

The utility model content

The utility model provides a kind of centralizer, is intended to solve in the prior art go into the well difficulty or hold up the not enough problem of power of centralizer.

In order to address the above problem; The utility model provides a kind of centralizer, said centralizer in a tubular form, said centralizer tube wall is provided with the through hole perpendicular to the centralizer length direction; If the movable righting arm that stretches out through hole is in said through hole; Said righting arm is hollow cylinder structure, and the one of which end is communicated with the centralizer inner chamber, other end sealing.

Further; Said righting arm is made up of the one-level sleeve set at least; The interior level sleeve top closure of said righting arm is established a fixed muffle on the said through-hole wall, the end that the outermost level sleeve of said righting arm is positioned at the centralizer inner chamber is provided with the Ka Tai that external diameter is equal to or less than said fixed muffle internal diameter; Said fixed muffle top is provided with can block said Ka Tai and prevent that outermost level sleeve from deviating from the card edge of centralizer, and the internal diameter of said fixed muffle upper end is greater than or equal to the external diameter of righting arm.

Further; Said righting arm is made up of the two-stage sleeve set at least; An interior said level sleeve bottom is provided with second Ka Tai; The said second card platform external diameter is equal to or less than the internal diameter of outermost level sleeve, and said outermost level sleeve top is provided with can block the second card edge that said second Ka Tai prevents that interior level sleeve from deviating from centralizer, and the internal diameter of said outermost level sleeve upper end is greater than or equal to the external diameter of interior level sleeve.

Preferably, said Ka Tai is provided with holddown groove, is provided with sealing ring in the said holddown groove.

Preferably, said second Ka Tai is provided with holddown groove, is provided with sealing ring in the said holddown groove.

Preferably, said righting arm sleeve outer wall is provided with the ratchet that can prevent the righting arm withdrawal, and said card is provided with corresponding identical ratchet card falcon with said ratchet along sidewall.

Preferably, the interior said level sleeve outer wall is provided with latch, and said second card is provided with corresponding identical ratchet card falcon with said ratchet along sidewall.

Preferably, said righting arm is distributed on the said centralizer outer wall four sides.

Use technique scheme, in the said centralizer lower going-into-well after, in said centralizer, apply hydraulic pressure or air pressure; Because said righting arm is hollow cylinder and is communicated with the centralizer inner chamber, under the effect of pressure, said righting arm is forced out through hole; When whole righting arms stretch out when propping up the borehole wall, under the effect of pressure, righting arm can be set upright desired location with centralizer and sleeve pipe; Said centralizer has overcome the shortcoming of traditional centralizer in the prior art: the external diameter difficulty of going into the well greatly also or spring force is little, does not reach centralizing function; On horizontal well, better do not set upright way especially at present; The centralizer that the utility model provided, external diameter reduces, and goes into the well easily to get into the relevant position.

Description of drawings

Fig. 1 is that the centralizer that the utility model provides uses preceding side sectional view;

Fig. 2 is Figure 1A place enlarged diagram that the utility model provides;

Fig. 3 is that the centralizer that the utility model provides uses preceding cross-sectional view;

Fig. 4 is the side sectional view of the centralizer that provides of the utility model when using;

Fig. 5 is the cross-sectional view of the centralizer that provides of the utility model when using;

Fig. 6 is the sketch map when not using after centralizer that the utility model provides is gone into the well;

Fig. 7 is centralizer that the utility model the provides sketch map of back when using of going into the well;

The specific embodiment

For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

Referring to figs. 1 through shown in Figure 7, the utility model embodiment provides a kind of centralizer 1, and said centralizer 1 in a tubular form; Said centralizer 1 tube wall 11 is provided with the through hole 12 perpendicular to centralizer 1 length direction, establishes the movable righting arm 3 that stretches out through hole 12 in said through hole 12, and said righting arm 3 is hollow cylinder structure; The one of which end is communicated with centralizer 1 inner chamber, and technique scheme is used in other end sealing; After in said centralizer 1 lower going-into-well 9, in said centralizer 1, apply hydraulic pressure or air pressure, because said righting arm 3 is hollow cylinder and is communicated with centralizer 1 inner chamber; Under the effect of pressure, said righting arm 3 is forced out through hole 12, when whole righting arms 3 stretch out when propping up Jing9Bi; Under the effect of pressure, righting arm 3 can be set upright desired location with centralizer 1 and sleeve pipe 8, and said centralizer 1 has overcome the shortcoming of traditional centralizer in the prior art: external diameter 9 difficulties of going into the well greatly; Also or spring force is little, do not reach centralizing function, on horizontal well 9, better do not set upright way especially at present; The centralizer 1 that the utility model provided, external diameter reduces, the 9 entering relevant positions of going into the well easily.

Further; In order to prevent to break away from centralizer 1 after the sectional diameter in well 9 middle parts from causing said righting arm 3 to be under pressure above predetermined value; Said righting arm 3 is designed to be made up of the one-level sleeve set at least, and interior level sleeve 33 top closure of said righting arm 3 are established a fixed muffle 31 on said through hole 12 inwalls; The end that the outermost level sleeve 32 of said righting arm 3 is positioned at centralizer 1 inner chamber is provided with the card platform 4 that external diameter is equal to or less than said fixed muffle 31 internal diameters; Said fixed muffle 31 tops are provided with can block card that said card platform 4 prevents that outermost level sleeve 32 from deviating from centralizer 1 along 311, and the internal diameter of said fixed muffle 31 upper ends is greater than or equal to the external diameter of righting arm 3, uses technique scheme; Said righting arm 3 is under pressure and stretches out; When said righting arm 3 all stretched out, card platform 4 was blocked by the card of said fixed muffle 31 edge 311, can guarantee that righting arm 3 can not detach centralizer 1.

Further, in order can under the constant situation of centralizer 1 diameter own, to extend and to stretch out the amplitude of righting arm 3; The spy is designed to said righting arm 3 to be made up of the two-stage sleeve set, and interior said level sleeve 33 bottoms are provided with the second card platform 5, and the said second card platform, 5 external diameters are equal to or less than the internal diameter of outermost level sleeve 32; Said outermost level sleeve 32 tops be provided with can block the said second card platform 5 prevent in level sleeve 33 deviate from centralizer 1 second card along 321, the external diameter of level sleeve 33 in the internal diameter of said outermost level sleeve 32 upper ends is greater than or equal to is in the use; Said righting arm 3 two-stages are stretched out, and not only can adapt to the well 9 of larger diameter, simultaneously; For diameter disunity in the well 9; The irregular situation of each section, said righting arm 3 freely stretches out, and is changeable; Adapt to the actual environment in the well 9 fully, reliability is stronger.

Preferably, said card platform 4 is provided with holddown groove 41, is provided with sealing ring in the said holddown groove 41.After pressure fluid or pressed gas entering righting arm 3; Said righting arm 3 stretches; Sealing ring between fixed muffle 31 and the righting arm 3 can fully play avoids leak pressing the situation of perhaps pressure release to take place, and has guaranteed the more stable more guaranteed work of carrying out of righting arm 3.

Preferably; The said second card platform 5 is provided with holddown groove 51; Be provided with sealing ring in the said holddown groove 51, after pressure fluid or pressed gas entering righting arm 3, said righting arm 3 stretches; Sealing ring between the sleeves at different levels can fully play avoids leak pressing the situation of perhaps pressure release to take place, and has guaranteed the more stable more guaranteed work of carrying out of righting arm 3.

Preferably; Said righting arm 3 sleeve outer walls are provided with the ratchet 322 that can prevent righting arm 3 withdrawals; Said card is provided with and said ratchet 322 corresponding identical ratchet card falcons 313 along 311 sidewalls; Said righting arm 3 is under pressure after protruding; The ratchet 322 that righting arm 3 sleeve outer walls are provided with is caused righting arm 3 sleeves can't return after stretching out by 313 fastenings of said ratchet card falcon, has guaranteed that the support part of centralizer 1 can not produce the problem of returning because of the variation of hydraulic pressure or air pressure, has further improved the reliability of centralizer 1.

Preferably; The ratchet 332 of level sleeve 33 withdrawals in interior said level sleeve 33 outer walls are provided with and can prevent; Said second card is provided with and said ratchet 332 corresponding identical ratchet card falcons 323 along 321 sidewalls; When interior level sleeve 33 is protruding; Level sleeve 33 can't be return after stretching out in the ratchet 332 that its sidewall is provided with was caused by 323 fastenings of said ratchet card falcon, had guaranteed that the support part of centralizer 1 can not produce the problem of returning because of the variation of hydraulic pressure or air pressure, had further improved the reliability of centralizer 1.

Preferably; Said righting arm 3 is distributed on the said centralizer 1 outer wall four sides; Said centralizer 1 in getting into well 9 after; Need not adjust the orientation of centralizer 1, can centralizer 1 and the sleeve pipe of being set upright 8 thereof be remained on the center of well 9, the distance of sleeve pipe 8 outer walls and Jing9Bi is consistent from any angle.

The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.

Claims

1. centralizer, said centralizer is characterized in that in a tubular form,

Said centralizer tube wall is provided with the through hole perpendicular to the centralizer length direction, establishes the movable righting arm that stretches out through hole in said through hole, and said righting arm is hollow cylinder structure, and the one of which end is communicated with the centralizer inner chamber, other end sealing.

2. centralizer as claimed in claim 1 is characterized in that,

Said righting arm is made up of the one-level sleeve set at least; The interior level sleeve top closure of said righting arm; Establish a fixed muffle on the said through-hole wall; The end that the outermost level sleeve of said righting arm is positioned at the centralizer inner chamber is provided with the Ka Tai that external diameter is equal to or less than said fixed muffle internal diameter, and said fixed muffle top is provided with can block said Ka Tai and prevent that outermost level sleeve from deviating from the card edge of centralizer, and the internal diameter of said fixed muffle upper end is greater than or equal to the external diameter of righting arm.

3. centralizer as claimed in claim 2 is characterized in that,

Said righting arm is made up of the two-stage sleeve set at least; An interior said level sleeve bottom is provided with second Ka Tai; The said second card platform external diameter is equal to or less than the internal diameter of outermost level sleeve; Said outermost level sleeve top is provided with can block the second card edge that said second Ka Tai prevents that interior level sleeve from deviating from centralizer, and the internal diameter of said outermost level sleeve upper end is greater than or equal to the external diameter of interior level sleeve.

4. centralizer as claimed in claim 2 is characterized in that said Ka Tai is provided with holddown groove, is provided with sealing ring in the said holddown groove.

5. centralizer as claimed in claim 3 is characterized in that, said second Ka Tai is provided with holddown groove, is provided with sealing ring in the said holddown groove.

6. centralizer as claimed in claim 2 is characterized in that, said righting arm sleeve outer wall is provided with the ratchet that can prevent the righting arm withdrawal, and said card is provided with corresponding identical ratchet card falcon with said ratchet along sidewall.

7. centralizer as claimed in claim 3 is characterized in that, the interior said level sleeve outer wall is provided with latch, and said second card is provided with corresponding identical ratchet card falcon with said ratchet along sidewall.

8. like each described centralizer of claim 1-7, it is characterized in that said righting arm is distributed on the said centralizer outer wall four sides.