阅读说明：本技术 一种浮动扩张式封隔器 (Floating expansion type packer ) 是由 骆劲羽 冯强 刘志斌 张鹏 张镇 秦诗涛 丁柯宇 詹鸿运 王学正 王江 宗庆伟 于 2020-12-11 设计创作，主要内容包括：本发明公开了一种浮动扩张式封隔器,上接头、下接头分别与中心管相连,胶筒上骨架、胶筒下骨架与胶筒套装在中心管外壁上,胶筒上骨架与上胶筒座通过螺纹连接并与上接头通过螺纹连接,胶筒下骨架与下胶筒座通过螺纹连接,上接头上通过螺纹连接安装上调节环,用于限位上胶筒座的安装位置；下胶筒座套在下接头的外侧,下接头的外壁设置有一圈凸出的台阶,台阶与下胶筒座下部环腔的内壁配合接触并密封,使下胶筒座能沿着台阶上下移动,在下胶筒座底部内壁螺纹连接有浮动头,浮动头为环状并与下接头的外侧接触配合,下接头上连接安装下调节环,限位下胶筒座上下移动距离。采用浮动密封,提高压裂过程中扩张式封隔器稳定性、提高承压能力和使用寿命。(The invention discloses a floating expansion type packer, wherein an upper joint and a lower joint are respectively connected with a central pipe, an upper framework of a rubber cylinder, a lower framework of the rubber cylinder and the rubber cylinder are sleeved on the outer wall of the central pipe, the upper framework of the rubber cylinder is connected with an upper rubber cylinder seat through threads and is connected with the upper joint through threads, the lower framework of the rubber cylinder is connected with a lower rubber cylinder seat through threads, and an upper adjusting ring is installed on the upper joint through threads for limiting the installation position of the upper rubber cylinder seat; lower packing element seat cover is in the outside of lower clutch, and the outer wall of lower clutch is provided with the convex step of round, and the step cooperates the contact and seals with the inner wall of lower packing element seat lower part ring chamber, makes lower packing element seat can reciprocate along the step, has unsteady head at packing element seat bottom inner wall threaded connection down, and unsteady head is cyclic annular and with the outside contact cooperation of lower clutch, connects on the lower clutch and installs down the regulating ring, spacing packing element seat displacement distance down. By adopting floating seal, the stability of the expanding packer in the fracturing process is improved, the bearing capacity is improved, and the service life is prolonged.)

1. A floating expansion packer comprises an upper joint (1), an upper rubber cylinder seat (3), an upper rubber cylinder framework (4), a rubber cylinder (5), a central tube (6), a lower rubber cylinder framework (7), a lower rubber cylinder seat (8) and a lower joint (11), wherein the upper joint (1) and the lower joint (11) are respectively in threaded connection with the central tube (6), the upper rubber cylinder framework (4) is in threaded connection with the rubber cylinder (5), the lower rubber cylinder framework (7) is in glue injection and vulcanization fixation with the rubber cylinder (5) through a mould and is sleeved on the outer wall of the central tube (6), the upper rubber cylinder framework (4) is in threaded connection with the upper rubber cylinder seat (3), the upper rubber cylinder seat (3) is arranged on the rubber cylinder (5) and is in threaded connection with the upper joint (1), the lower rubber cylinder framework (7) is in threaded connection with the lower rubber cylinder seat (8), and the lower rubber cylinder seat (8) is arranged on the rubber cylinder (5), the upper part of the upper rubber barrel seat (3) is sleeved on the outer side of the upper joint (1), and an upper adjusting ring (2) is installed on the upper joint (1) through threaded connection and used for limiting the installation position of the upper rubber barrel seat (3) above the upper rubber barrel seat (3); the lower part of the lower rubber cylinder seat (8) is sleeved on the outer side of the lower joint (11), a circle of convex steps (12) are arranged on the outer wall of the lower joint (11), the steps (12) are in matched contact with the inner wall of an annular cavity at the lower part of the lower rubber cylinder seat (8) and are sealed through a sealing ring (13), so that the lower rubber cylinder seat (8) can move up and down along the steps (12), a floating head (9) is in threaded connection with the inner wall at the bottom of the lower rubber cylinder seat (8), and the floating head (9) is annular and is in contact fit with the outer side of the lower joint (11); and a lower adjusting ring (10) is connected and installed below the lower rubber cylinder seat (8) on the lower joint (11) through threads and used for limiting the up-and-down movement distance of the lower rubber cylinder seat (8).

2. A floating expandable packer according to claim 1, characterised in that the sealing ring (13) is double-ported.

Technical Field

The invention relates to a floating expansion type packer, belongs to the technical field of reservoir transformation, and is suitable for layered fracturing construction operation.

Background

The existing technology generally adopts a mode of 'packer + sliding sleeve' to carry out separate-layer fracturing transformation, the fracturing scale is larger and larger along with the gas field exploration and development entering the middle and later stages, the construction pressure is higher and higher, the overpressure phenomenon is more and more common, the liquid friction is minimum at the moment of stopping the pump, the pump pressure even exceeds the construction pressure limiting, the overpressure instant bearing pressure difference of the expansion type packer reaches the maximum, and new requirements are provided for the pressure bearing performance and the stability of the packer.

With the phenomenon of overpressure becoming more common, as shown in fig. 1, the conventional expandable packer includes an upper joint 21, an upper rubber sleeve seat 22, a rubber sleeve 23, a central tube 24, a lower rubber sleeve seat 25, and a lower joint 26, where the upper joint 21 is in threaded connection with the central tube 24, the lower joint 26 is in threaded connection with the central tube 6, the rubber sleeve 23 is sleeved on the central tube 24, the upper end of the rubber sleeve 23 is in threaded connection with the upper rubber sleeve seat 22, the lower end of the rubber sleeve 23 is in threaded connection with the lower rubber sleeve seat 25, the upper rubber sleeve seat 22 is in threaded connection with the upper joint 21, and the lower rubber sleeve seat 25 is in threaded connection with the lower joint 26, so that the rubber sleeve 23 is sleeved outside. However, in the above structure, after the two ends of the rubber cylinder 23 are fixed with the upper joint 21 and the lower joint 26 respectively through the upper rubber cylinder seat 22 and the lower rubber cylinder seat 25, the sleeve is sealed only by the deformation of the rubber cylinder, the deformation of the shoulder of the rubber cylinder is large, and the sleeve cannot be adjusted according to specific working conditions, stress concentration is easily generated on the shoulder of the rubber cylinder at the moment of overpressure, so that the phenomena of unsealing after deformation of the rubber cylinder, unsealing after overpressure, reduction in service life and the like are caused, and the stability is poor.

Disclosure of Invention

The invention aims to solve the technical problems that the deformation of the shoulder part of a rubber sleeve of a conventional expansion type packer is large in the fracturing construction process, the rubber sleeve is not unsealed and is not sealed off due to stress concentration of the shoulder part of the rubber sleeve after instantaneous overpressure, the service life of the rubber sleeve is shortened, and the like; in the fracturing construction process, the sealing mechanism can adjust the deformation amount of the sealing mechanism according to pressure fluctuation, so that the stress concentration effect of the shoulder of the rubber cylinder is effectively buffered and weakened, and the shoulder is protected; the stability of the expanding packer in the fracturing process is improved, the bearing capacity is improved, and the service life is prolonged.

In order to solve the technical problems, the invention adopts the technical scheme that: a floating expansion type packer comprises an upper joint, an upper rubber cylinder seat, an upper rubber cylinder framework, a rubber cylinder, a central pipe, a lower rubber cylinder framework, a lower rubber cylinder seat and a lower joint, wherein the upper joint and the lower joint are respectively connected with the central pipe through threads; the lower part of the lower rubber cylinder seat is sleeved on the outer side of the lower joint, the outer wall of the lower joint is provided with a circle of convex steps, the steps are in matched contact with the inner wall of an annular cavity at the lower part of the lower rubber cylinder seat and are sealed through a sealing ring, so that the lower rubber cylinder seat can move up and down along the steps, the inner wall at the bottom of the lower rubber cylinder seat is in threaded connection with a floating joint, and the floating joint is annular and is in contact fit with the outer side of the lower joint; and a lower adjusting ring is connected and installed on the lower joint through threads below the lower rubber cylinder seat and used for limiting the up-and-down movement distance of the lower rubber cylinder seat.

The sealing ring is double-channel.

The invention has the beneficial effects that: the sealing assembly adopts floating sealing, the deformation amount of the sealing assembly is larger, and the deformation amount of the shoulder part of the rubber cylinder is reduced; in the fracturing construction process, the sealing mechanism can adjust the deformation amount of the sealing mechanism according to pressure fluctuation, particularly at the moment of overpressure, the stress concentration effect of the shoulder of the rubber cylinder is effectively buffered and weakened, and the shoulder is protected; the stability of the expanding packer in the fracturing process is improved, the bearing capacity is improved, and the service life is prolonged.

Drawings

FIG. 1 is a schematic diagram of a conventional expandable packer construction of the prior art.

FIG. 2 is a schematic diagram of the floating expandable packer construction of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in figure 2, the floating expanding packer comprises an upper joint 1, an upper rubber cylinder seat 3, an upper rubber cylinder framework 4, a rubber cylinder 5, a central pipe 6, a lower rubber cylinder framework 7, a lower rubber cylinder seat 8 and a lower joint 11, wherein the upper joint 1 and the lower joint 11 are respectively in threaded connection with the central pipe 6, the upper rubber cylinder framework 4, the rubber cylinder 5, the lower rubber cylinder framework 7 and the rubber cylinder 5 are fixed together through mould glue injection and vulcanization and are sleeved on the outer wall of the central pipe 6, the upper rubber cylinder framework 4 is in threaded connection with the upper rubber cylinder seat 3, the upper rubber cylinder seat 3 is installed on the rubber cylinder 5 and is in threaded connection with the upper joint 1, the lower rubber cylinder framework 7 is in threaded connection with the lower rubber cylinder seat 8, the lower rubber cylinder seat 8 is installed on the rubber cylinder 5, the upper part of the upper rubber cylinder seat 3 is sleeved on the outer side of the upper joint 1, an upper adjusting ring 2 is installed above the upper rubber cylinder seat 3 through threaded connection, the mounting position of the upper rubber barrel seat 3 is limited; the lower part of the lower rubber cylinder base 8 is sleeved on the outer side of the lower joint 11, a circle of convex steps 12 are arranged on the outer wall of the lower joint 11, the steps 12 are in matched contact with the inner wall of an annular cavity at the lower part of the lower rubber cylinder base 8 and are sealed through a sealing ring 13, so that the lower rubber cylinder base 8 can move up and down along the steps 12, a floating head 9 is in threaded connection with the inner wall at the bottom of the lower rubber cylinder base 8, and the floating head 9 is annular and is in contact fit with the outer side of the lower joint 11; and a lower adjusting ring 10 is connected and installed on the lower joint 11 below the lower rubber cylinder seat 8 through threads and used for limiting the up-and-down movement distance of the lower rubber cylinder seat 8.

Preferably, the sealing ring 13 is double-pass.

Floating expanding packer passes through the slot position feed liquor on the center tube 6, makes packing element 5 expand and seal, and unsteady head 9 slides along step 12 on the lower clutch 11 under the effect of the pressure in packing element 5, realizes with sheathed tube sealed to carry on spacingly through step 12 on the lower clutch 11. Compared with the conventional expanding packer, the floating head 9 of the floating expanding packer can slide up and down along the outer wall of the lower joint 11 along with the continuous change of pressure in the fracturing construction process, has larger deformation amount per se, reduces the deformation amount of the shoulder of the rubber sleeve, and can compensate the deformation amount of a sealing mechanism, particularly effectively buffer and weaken the stress concentration effect of the shoulder of the rubber sleeve at the moment of overpressure, protect the shoulder, improve the pressure bearing capacity and prolong the service life.

In summary, the disclosure of the present invention is not limited to the above-mentioned embodiments, and persons skilled in the art can easily set forth other embodiments within the technical teaching of the present invention, but such embodiments are included in the scope of the present invention.