Summary of the invention
Main purpose of the present invention is to solve problems of the prior art, providing a kind of is applied in the heavy crude heat extraction segmentation completion, solution needs segmentation transformation or segmentation to annotate the thermal packer of the outer packing problem of sleeve pipe in the thick oil horizontal well of vapour, make it to adapt under the worst hot case of down-hole and work for a long time, and keep good sealing characteristics simultaneously.
The objective of the invention is to be achieved by following technical proposals:
High temperature-resistance external casing packer is characterized in that: comprising: top connection, one-level fluid cylinder, the first glue bucket, the second glue bucket, secondary fluid cylinder, the 3rd glue bucket, three grades of fluid cylinders and lower contact;
Splicing sleeve about described top connection and the lower contact respectively; This one-level fluid cylinder one end links to each other with top connection, and the other end is connected with the described first glue bucket; These three grades of fluid cylinder one ends link to each other with lower contact, and the other end is connected with described the 3rd glue bucket; Closely link to each other by one grade of ring between the described first glue bucket and the second glue bucket; Described secondary fluid cylinder is in order to connect described second glue bucket and the 3rd glue bucket.
What described one-level fluid cylinder and three grades of fluid cylinders adopted is unidirectional fluid cylinder; What described secondary fluid cylinder adopted is two-way fluid cylinder; The fixed end of this one-level fluid cylinder links to each other with top connection, and movable end links to each other with the first glue bucket; The fixed end of these three grades of fluid cylinders links to each other with lower contact, and movable end links to each other with the 3rd glue bucket.
The rubber hardness of described the 3rd glue bucket is greater than the rubber hardness of the first and second glue buckets.
Also be provided with a setting tool; Described setting tool comprises: oil pipe, constant pressure switch, oil pipe plug and two interior bloat tools of pipe;
Described oil pipe is in order to import highly pressurised liquid in setting tool; Described oil pipe plug is arranged on the tail end of oil pipe, in order to realize the oil pipe sealing; Described constant pressure switch is arranged on this oil pipe; Bloat tool is separately positioned on the constant pressure switch both sides in described two pipes; This constant pressure switch be one according to the switching device that pressure carries out switch control is set, when its pressure that is subjected to is then opened valve during greater than setting pressure, otherwise its valve will be in closed condition; Bloat tool is a fluid pressure type bloat tool in this pipe, can make this fluid pressure type bloat tool dilatancy after institute's fluid pressure that charges into surpasses starting pressure in it; This setting tool is arranged in the central tube of described thermal packer; Bloat tool lays respectively at described top connection and lower contact place in these two pipes, and this constant pressure switch is arranged in the thermal packer; The starting pressure of bloat tool is less than the setting pressure of this constant pressure switch in the described pipe.
The invention has the beneficial effects as follows:
1, this high temperature-resistance external casing packer is provided with the two-layer glue bucket that helps out by the upside at the 3rd glue bucket, with sealing performance that improves thermal packer and the life-span that prolongs rubber.
2, this high temperature-resistance external casing packer is by ingenious design and application to setting tool in it, improve the flexibility that this thermal packer uses, setting tool does not belong to former pipe string, can be deep to any assigned address down, guarantee the packer envelope that can expand cmpletely, can realize process operations such as segmentation thermal recovery.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Fig. 1 is the structural representation of the designed high temperature-resistance external casing packer of the present invention.This high temperature-resistance external casing packer comprises: top connection 1, one-level fluid cylinder 2, the first glue bucket 3, the second glue bucket 4, secondary fluid cylinder 5, the 3rd glue bucket 6, three grades of fluid cylinders 7 and lower contacts 8.
As shown in the figure, this high temperature-resistance external casing packer is vertical direction in use and is placed in the bore hole, splicing sleeve about described top connection 1 and the lower contact 8 respectively.These one-level fluid cylinder 2 one ends link to each other with top connection 1, and the other end is connected with the described first glue bucket 3.These three grades of fluid cylinder 7 one ends link to each other with lower contact 8, and the other end is connected with described the 3rd glue bucket 6.Closely link to each other by one grade of ring 9 between the described first glue bucket 3 and the second glue bucket 4.Described secondary fluid cylinder 5 is in order to connect described second glue bucket 4 and the 3rd glue bucket 6.
In the high temperature-resistance external casing packer of said structure, the present invention not only is provided with the 3rd glue bucket 6 that is equivalent to glue bucket in traditional thermal packer in order to realize the packing to bore hole, also is provided with the first glue bucket 3 and the second glue bucket, the 4 two-layer glue buckets of close proximity above it.Play and assist the 3rd glue bucket 6 to play complete packing and resistant to elevated temperatures effect by setting up the first glue bucket 3 and the second glue bucket, 4 two-layer glue buckets.
In use, the first glue bucket 3, the second glue bucket 4 and 6 three layers of glue bucket of the 3rd glue bucket produce deformation under the impetus of each fluid cylinder, realize the packing effect to bore hole.Realize the structure of packing compared to existing individual layer glue bucket, the designed thermal packer of the present invention is under the situation that the 3rd glue bucket 6 descends because of HTHP effect sealing performance, still have the first and second glue buckets and realize packing, thereby guaranteed normally carrying out of thermal recovery operation, also guaranteed the packing effect that this thermal packer can be remained valid for a long time in the down-hole.What deserves to be mentioned is that in addition these first and second glue buckets of setting up closely link to each other by one grade of ring 9, its position is very approaching.Such structure can upwards be leaked by the pressed gas that the 3rd glue bucket leaks envelope in more efficiently obstruct.
Because above-mentioned each glue bucket mainly is to rely on the extruding force distortion that is subjected to fluid cylinder to realize packing.And by the deformation rule of rubber material as can be known, its deformation under the simultaneously stressed situation in both sides is comparatively obvious.In view of the above, wherein one-level fluid cylinder 2 and three grades of fluid cylinders 7 adopt the designed high temperature-resistance external casing packer of the present invention is unidirectional fluid cylinder, and what described secondary fluid cylinder 5 adopted is two-way fluid cylinder.The fixed end of this one-level fluid cylinder 2 links to each other with top connection 1, and movable end links to each other with the first glue bucket 3.The fixed end of these three grades of fluid cylinders 7 links to each other with lower contact 8, and movable end links to each other with the 3rd glue bucket 6.
From the above, the packing glue bucket of the 3rd glue bucket 6 described in the present invention for playing a major role, and the first glue bucket 3 and the second glue bucket 4 have as further replenishing the 3rd glue bucket 6.Because the physical property of elastomeric material is that big more its temperature resistance anti-pressure ability of hardness is strong more, but deformation elasticity is poor more; Otherwise more little its temperature resistance anti-pressure ability of hardness is poor more, but deformation elasticity is strong more.In view of this physical characteristic of elastomeric material, and the not same-action of aforementioned each glue bucket, so the rubber hardness of the 3rd glue bucket 6 and rubber hardness and the high temperature resistant degree that high temperature resistant degree is greater than the first and second glue buckets among the present invention.
Except apply extruding force by fluid cylinder the barrel-shaped change of glue is realized the packing, prior art generally also can be provided with setting tool in the central tube of thermal packer, in order to charge into highly pressurised liquid in thermal packer, promote fluid cylinder and move, make it apply lateral pressure to the glue bucket, rubber further expands.The structure of traditional setting tool also has similar structure, we fully are applied to the thermal packer that expands with this type of setting tool, this mode of setting can reach the purpose of layering thermal recovery, in different well depth positions, can accurately setting tool be arrived assigned address down, packer is set.
And in the present invention, we have fully used this setting tool and have applied it to and set in the thermal packer.Fig. 2 is the structural representation of this high temperature-resistance external casing packer setting tool.As shown in the figure, this setting tool comprises: oil pipe 21, constant pressure switch 22, oil pipe plug 23 and two interior bloat tools 24 of pipe.Described oil pipe 21 is in order to import highly pressurised liquid in setting tool.Described oil pipe plug 23 is arranged on the tail end of oil pipe 21, in order to realize the oil pipe sealing.Described constant pressure switch 22 is arranged on this oil pipe 21.Bloat tool 24 is separately positioned on constant pressure switch 22 both sides in described two pipes.This constant pressure switch 22 be one according to the switching device that pressure carries out switch control is set, then open the highly pressurised liquid of valve in during greater than a certain setting pressure when its pressure that is subjected to and emit, otherwise its valve will be in closed condition it.Bloat tool 24 is a fluid pressure type bloat tool in this pipe, when institute's fluid pressure that charges in it can make this fluid pressure type bloat tool dilatancy above behind certain starting pressure.This setting tool is arranged in the central tube of described thermal packer.Bloat tool 24 lays respectively at described top connection 1 and lower contact 8 places in these two pipes, and this constant pressure switch 22 is arranged in the thermal packer.The starting pressure of bloat tool 24 is less than the setting pressure of this constant pressure switch 22 in the described pipe.
The setting tool of said structure is in the process of setting, at first by oil pipe charged pressure liquid in it.When fluid pressure greater than pipe in during the starting pressure of bloat tool 24, highly pressurised liquid at first can make its fluid pressure type bloat tool dilatancy, thus the last lower interface of sealing thermal packer makes the interior formation of thermal packer one enclosed environment.When fluid pressure further improved the setting pressure that surpasses constant pressure switch 22, the valve of constant pressure switch 22 was opened, and the highly pressurised liquid that feeds in the oil pipe injects in the thermal packer, thereby realized setting aforementioned each glue bucket.
The benefit of the setting tool of this structure is simple to operate, can be lowered into the exact position at any well depth, sets the back that finishes and proposes, and does not influence former pipe string structure, does not need to change former construction technology.
In sum, the designed high temperature-resistance external casing packer of the present invention at first be provided with by upside at the 3rd glue bucket two-layer high temperature resistant and guarantee the glue bucket of sealing function, to improve the sealing performance and the application life of thermal packer.Secondly, also, further improve the sealing of this thermal packer, as long as the well radius variations rate can obtain excellent sealing performance less than 10% by the structure of setting tool in it is transformed.Setting tool establishes one's own system, and stays the well casing string not link to each other with completion, has reliability and accuracy.Can under 275-360 ℃ crude oil, water vapor, reliably work long hours.
Therefore, persons skilled in the art are under above-mentioned design philosophy, and any not creative transformation of being done all should be considered as within protection scope of the present invention.