Summary of the invention
The utility model provides a kind of built-in hydraulic centralizing device, overcomes the defects of the prior art, can have
Effect, which solves arch casing stabbing board, can generate the problem of larger mill resistance and rigid centralizer flexibility difference.
The technical solution of the utility model is realized by following measures: a kind of built-in hydraulic centralizing device, including
Central axis, outer cylinder, spring leaf and pressure spring mechanism;Central axis is hollow shaft structure, is fixedly installed with outer cylinder in central axis interval,
Ring cavity is formed between outer cylinder and central axis, circle distribution has the elastic slice of at least three upward and downwards to stretch out window on outer cylinder, in bullet
Spring leaf is installed in the ring cavity that piece stretches out at window and compression spring leaf can be passed through and stretch out spring leaf outside window to elastic slice
The pressure spring mechanism arched.
Here is the further optimization and/or improvements to above-mentioned utility model technical solution:
Above-mentioned pressure spring mechanism may include thrust connection ring, shear pin and thrust sliding sleeve;At the center of ring cavity inner upper end
It is set with thrust connection ring on axis, retreating prevention mechanism is installed between thrust connection ring lower part and central axis;Spring leaf lower end is fixed,
The upper end of spring leaf is fixed on outside thrust connection ring by fastener;Pass through shear pin on the central axis on the downside of thrust connection ring
Nail is fixedly installed with thrust sliding sleeve;Central axis is external multi-diameter shaft with a narrow upper and lower width, be equipped in the lower end of thrust sliding sleeve by
Land in pressing, be pressurized in land sealing shroud in the narrow diameter section of central axis, be pressurized in land upper end be stuck in central axis wide path with
On the shaft shoulder between the narrow diameter section of central axis;Thrust sliding sleeve above the shaft shoulder is equipped with pressure transmission hole.
It can be equipped with card slot outside the above-mentioned narrow diameter section in central axis lower part, be provided with the support snap ring of opening in card slot;Support snap ring
Outer ring surface withstand on spring leaf.
Above-mentioned retreating prevention mechanism may include anti-back ring and support ring;Anti-back is externally provided in the middle part of portion's wide path on center shaft to fall
Tooth section, from top to bottom arranged distribution has pawl in anti-back pawl section;Groove is equipped in the lower part of thrust connection ring, in groove
Anti-back ring and support ring are from top to bottom sequentially installed in top, anti-back ring is split ring or more valve group cyclizations, on anti-back ring
Equipped with internal tooth, and engages and be mounted on outside the upper end of anti-back pawl section;Screw thread is equipped in the lower part of groove, the upper end of thrust sliding sleeve is logical
It crosses to be screwed and be mounted in groove lower part;Support ring is seated at the top of thrust sliding sleeve;Outside the lower part of anti-back ring and support ring
Top in be respectively equipped with the annular conical surface that can be mutually matched.
Above-mentioned outer cylinder can be fixedly mounted on outside central axis by upper fixed ring seat and lower fixed ring seat;In the downside of central axis
It is externally provided with screw thread, lower fixed ring seat is threadably secured installation on center shaft;It is externally provided with card slot in the upper end of lower fixed ring seat,
Outer cylinder lower end is seated on card slot;It is equipped with screw thread in the upper end of outer cylinder, and is fixedly installed togather by screw thread and upper fixed ring seat;
Upper fixed ring seat is fixedly mounted on outside the upside of central axis by the fastener of circle distribution;It is central axis, upper fixed ring seat, lower solid
Determine to form cavity between ring seat and outer cylinder;Lower fixed ring seat corresponding with spring leaf is equipped with slot, and the insertion of spring leaf lower end is inserted
In slot, and it is fixed together by fastener.
Oblique transition annular conical surface can be formed respectively outside outside the upper end of the above-mentioned fixed ring seat and lower end of lower fixed ring seat.
The outer diameter of above-mentioned outer cylinder, upper fixed ring seat lower part and lower fixed ring seat top can be consistent.
The upper center that above-mentioned elastic slice stretches out window can be equipped with vertical guide groove, spring leaf corresponding with guide groove and push away
It is fixed together in power connection ring by fastener;The outer end of fastener is located in corresponding guide groove.Wherein, tightly
The outer end of firmware is located in guide groove, carries out circumferential limit to the thrust connection ring and spring leaf connected by fastener, avoids
Spring leaf rotates dislocation in cavity, guarantees that spring leaf stretches out from window from elastic slice and stretches out;In addition to this, the upper end of spring leaf is logical
The outer cylinder for crossing guide groove two sides blocks, and not only guarantees connection, avoids between spring leaf upper end and thrust connection ring because spring leaf bends
The case where playing that deflection is excessive and leading to de- connect, improves the use reliability of this centralizer.
On the inside of the upper end of above-mentioned central axis and lower end outside can be equipped with screw thread respectively.
At least sealing ring together can be fixedly installed between central axis on the upside of above-mentioned pressure transmission hole and thrust sliding sleeve;Pressure transmission hole
The central axis of downside and at least sealing ring together is fixedly installed in being pressurized between land.
The utility model reasonable and compact in structure, it is easy to use;When entering well, ensconced in ring cavity in spring leaf, Neng Gou
The vertical section of well head reduces the frictional resistance of casing tripping in, and the speed of casing tripping in faster, makes to cement the well more efficient;This hydraulic centralizing device
External dimensions be less than wellbore internal diameter, so more flexible compared to rigid centralizer tripping in;Except this, helped since this is hydraulic
Positive device is using spring leaf, with certain elasticity, can carry out elastic tune with the thickness of wellbore in the case where starting righting state
Section, the range for being applicable in wellbore are wider.
Specific embodiment
The utility model is not limited by following embodiments, can technical solution according to the present utility model and actual conditions
Determine specific embodiment.
In the present invention, for ease of description, the description of the relative positional relationship of each component is according to specification
The Butut mode of attached drawing 1 is described, such as: the positional relationship of upper and lower, left and right is the Butut according to Figure of description 1
Direction determines.
The utility model is further described below with reference to examples and drawings:
As shown in Fig. 1, which includes central axis 1, outer cylinder 2, spring leaf 5 and pressure spring mechanism;In
Mandrel 1 is hollow shaft structure, is fixedly installed with outer cylinder 2 in 1 interval of central axis, and ring cavity 4 is formed between outer cylinder 2 and central axis 1,
Circle distribution has the elastic slice of at least three upward and downwards to stretch out window 3 on outer cylinder 2, pacifies in the ring cavity 4 that elastic slice stretches out at window 3
Equipped with spring leaf 5 and compression spring leaf 5 can be passed through and spring leaf 5 is made to stretch out the pressure spring mechanism arched outside window 3 to elastic slice.It uses
When, since the vertical section at well head does not need centralizer righting, without starting pressure spring mechanism;Therefore, spring leaf 5 at this time is built-in
In ring cavity 4, hydraulic centralizing device and bore hole inside wall can be made not to generate frictional resistance, the speed of casing tripping in faster, makes efficiency of cementing the well
It is higher;Except this, the external dimensions of this hydraulic centralizing device is less than wellbore internal diameter, thus it is fashionable under, between bore hole inside wall
Certain free gap can be generated, to guarantee that integral cannula string can pass through well head, use is more flexible;Moreover, because
This hydraulic centralizing device can carry out bullet with the thickness of wellbore under righting state with certain elasticity using spring leaf 5
Property adjust, the range for being applicable in wellbore is wider.
Above-mentioned built-in hydraulic centralizing device can be made further optimization and/or improvements according to actual needs:
As shown in Fig. 1, pressure spring mechanism includes thrust connection ring 7, shear pin 8 and thrust sliding sleeve 9;Inside ring cavity 4
It is set with thrust connection ring 7 on the central axis 1 of upper end, retreating prevention mechanism is installed between 7 lower part of thrust connection ring and central axis 1;
5 lower end of spring leaf is fixed, and the upper end of spring leaf 5 is fixed on outside thrust connection ring 7 by fastener 19;Under thrust connection ring 7
Thrust sliding sleeve 9 is fixedly installed with by shear pin 8 on the central axis 1 of side;Central axis 1 is external ladder with a narrow upper and lower width
Axis is equipped with land 10 in being pressurized in the lower end of thrust sliding sleeve 9, is pressurized interior 10 sealing shroud of land in the narrow diameter section of central axis 1,
10 upper end of land is stuck on the shaft shoulder 11 between 1 wide path of central axis and the narrow diameter section of central axis 1 in being pressurized;Above the shaft shoulder 11
Thrust sliding sleeve 9 is equipped with pressure transmission hole 12.
In cementing well operation, cementing plug starts bruising, and drilling fluid flow to thrust by pressure transmission hole 12 in casing
It in set gap between sliding sleeve 9 and central axis 1, and acts in compression in land 10, pushes sliding sleeve 9 to generate downward axial direction and push away
Power, when drilling liquid pressure increases to a certain extent, shear pin 8 is cut, the axial direction that thrust sliding sleeve 9 is acted in drilling fluid generation
Start to move down under thrust, band dynamicthrust connection ring 7 moves down, at this point, effect of the spring leaf 5 by thrust connection ring 7
It is bent outwardly deformation, forms the state that spring arches;Spring leaf 5 at this time can support on bore hole inside wall, to play righting
Effect placed in the middle;Wherein retreating prevention mechanism, the purpose that can prevent pressure sliding sleeve from retreating, makes spring leaf 5 arch always, guarantees righting shape
State.
As shown in Fig. 1, in 1 lower part of central axis, narrow diameter section is externally provided with card slot, is provided with the support snap ring of opening in card slot
13;The outer ring surface of support snap ring 13 is withstood on spring leaf 5.The effect of support snap ring 13 is the deformation side in order to guarantee spring leaf 5
To enabling spring leaf 5 to arch outward always deformation, it is ensured that its spring leaf 5 can play the role of righting.
As shown in attached drawing 1,2, retreating prevention mechanism includes anti-back ring 16 and support ring 15;In 1 top wide path of central axis
Portion is externally provided with anti-back pawl section 14, and from top to bottom arranged distribution has pawl in anti-back pawl section 14;In the lower part of thrust connection ring 7
It is interior to be equipped with groove, anti-back ring 16 and support ring 15 are from top to bottom sequentially installed in the top of groove, anti-back ring 16 is opening
Ring or more valve group cyclizations are equipped with internal tooth on anti-back ring 16, and engage and be mounted on outside the upper end of anti-back pawl section 14;Under groove
Screw thread is equipped in portion, the upper end of thrust sliding sleeve 9, which is threadably secured, to be mounted in groove lower part;Support ring 15 is seated at thrust sliding sleeve
9 top;Outside the lower part of anti-back ring 16 and the annular conical surface that can be mutually matched is respectively equipped in the top of support ring 15.
Wherein, anti-back ring 16 is split ring or more valve group ring structures, is based on installation and to use needs;When installation, first
Anti-back ring 16 is buckled in outside 14 upper end of anti-back pawl section, be then successively inserted in support ring 15 from the bottom to top on central axis 1 and is pushed away
Power sliding sleeve 9, the annular conical surface that anti-back ring is 16 are just seated on 15 top annular conical surface of support ring;It is from top to bottom covered to central axis 1 again
Enter thrust connection ring 7, and is fixed together between thrust sliding sleeve 9;In use, anti-back ring 16 is with thrust sliding sleeve 9 in
The internal tooth of 14 downlink of anti-back pawl section of mandrel 1, pawl and anti-back ring 16 outside anti-back pawl section 14 can be intermeshed, and be risen
To the function of anti-back;It, can be with thrust sliding sleeve 9, thrust connection ring 7 and support ring 15 together since spring leaf 5 is with certain elasticity
Upward reset thrust is generated to anti-back ring 16, support ring 15 is then acted on anti-back ring 16 by upper part annular conical surface, to anti-
It moves back ring 16 and applies an inside radial thrust, the internal tooth of anti-back ring 16 and the pawl of anti-back pawl section 14 is enable effectively to nibble
It closes, keeps anti-back effect relatively reliable.
As shown in Fig. 1, outer cylinder 2 is fixedly mounted on outside central axis 1 by upper fixed ring seat 17 and lower fixed ring seat 18;?
The downside of central axis 1 is externally provided with screw thread, and lower fixed ring seat 18, which is threadably secured, to be mounted on central axis 1;In lower fixed ring seat
18 upper end is externally provided with card slot, and 2 lower end of outer cylinder is seated on card slot;In the upper end of outer cylinder 2 be equipped with screw thread, and by screw thread with it is upper solid
Determine ring seat 17 to be fixedly installed togather;Upper fixed ring seat 17 is fixedly mounted on central axis 1 by the fastener 19 of circle distribution
Outside upside;Cavity 4 is formed between central axis 1, upper fixed ring seat 17, lower fixed ring seat 18 and outer cylinder;Under corresponding with spring leaf 5
Fixed ring seat 18 is equipped with slot, and 5 lower end of spring leaf is inserted into slot, and is fixed together by fastener 19.
To avoid this centralizer from entering well card resistance, as shown in Fig. 1, outside the upper end of upper fixed ring seat 17 and lower fixed ring seat 18
Lower end outside respectively oblique transition form annular conical surface.
As shown in Fig. 1, the outer diameter of outer cylinder 2, upper fixed 17 lower part of ring seat and lower 18 top of fixed ring seat is consistent.
As shown in Fig. 1, it is equipped with vertical guide groove 20 in the upper center that elastic slice stretches out window 3, it is right with guide groove 20
It is fixed together on the spring leaf 5 and thrust connection ring 7 answered by fastener 19;It is right with it that the outer end of fastener 19 is located at
In the guide groove 20 answered.Wherein, the outer end of fastener 19 is located in guide groove 20, connects to the thrust connected by fastener 19
Ring 7 and spring leaf 5 carry out circumferential limit, and spring leaf 5 is avoided to rotate dislocation in cavity, guarantee that spring leaf 5 stretches out window from elastic slice
It is stretched out at mouth 3;In addition to this, the upper end of spring leaf 5 is blocked by the outer cylinder 2 of 20 two sides of guide groove, is not only guaranteed connection, is avoided
Between 5 upper end of spring leaf and thrust connection ring 7 because spring leaf 5 arch deflection it is excessive due to lead to de- connect the case where, raising
The use reliability of this centralizer.
It is connect for convenience of this centralizer with bunch tube, as shown in Fig. 1, on the inside of the upper end of central axis 1 and lower end outside
It is respectively equipped with screw thread.
To increase contact surface leakproofness, as shown in Fig. 1, between the central axis 1 and thrust sliding sleeve 9 of 12 upside of pressure transmission hole
It is fixedly installed at least one of sealing ring 6;The central axis 1 of the downside of pressure transmission hole 12 and be fixedly installed between land 10 in being pressurized to
Few one of sealing ring 6.
The above technical characteristic constitutes the most preferred embodiment of the utility model, with stronger adaptability and best implementation
Effect can increase and decrease non-essential technical characteristic, according to actual needs to meet the needs of different situations.
The use process of the best embodiment of the utility model:
Before cementing well, the central axis 1 of this centralizer is threadably secured company with upper-lower section casing tubing string respectively
After being connected together and entering wellbore together, this centralizer is not turned at this time, and spring leaf 5 is completely disposed at elastic slice and stretches out in window 3,
Do not play centralizing function;
When being lowered into planned well fragment position, cementing plug starts bruising, and drilling fluid is pushed away by the inflow of pressure transmission hole 12 in casing
In gap between power sliding sleeve 9 and central axis 1, drilling fluid acts in the interior land 10 of compression and pushes thrust sliding sleeve 9, to thrust
Sliding sleeve 9 generates downward axial thrust, and when drilling liquid pressure increases to a certain extent, shear pin 8 is cut, thrust sliding sleeve
9 start to move down under the axial thrust of drilling fluid generation effect, band dynamicthrust connection ring 7, anti-back ring 16, support ring 15 1
It rises and moves down, the 5 lower part outwardly convex of spring leaf for making to connect by fastener 19 therewith that moves down of thrust connection ring 7 becomes
Shape, when spring leaf 5 to the reversing reset elastic force of thrust connection ring 7 and drilling fluid to the axial action dynamic balance of thrust sliding sleeve 9 when,
Spring leaf 5 reaches design variations degree, to play effective righting to casing.