阅读说明：本技术 一种内加压式动力芯轴及用于试油完井的井下动力装置 (Internal pressurization type power mandrel and underground power device for oil testing well completion ) 是由 贾海 黄船 谢胜 潘登 廖刚 贺秋云 张洋 蔡佳成 卢齐 曾胜 于 2019-09-30 设计创作，主要内容包括：本发明提供了一种内加压式动力芯轴及用于试油完井的井下动力装置。所述动力芯轴包括安装孔、传压孔、固定槽和密封件安装槽,安装孔内能够安装破裂盘；传压孔和安装孔能够传递动力芯轴内部的压力。所述装置包括外筒、动力芯轴、破裂盘、固定件、第一密封件、第二密封件和第三密封件,动力芯轴设置在一体化外筒的内部空腔中,动力芯轴外壁上设置有沿轴向依次分布的第一密封槽、传压孔、固定槽、第二密封槽和第三密封槽,动力芯轴与破裂盘、外筒之间能够形成密闭的第一环腔空间和第二环腔空间。本发明的有益效果包括：实现井下工具外部一体化的同时能够满足工具状态的改变。(The invention provides an internal pressurization type power mandrel and an underground power device for oil testing and well completion. The power mandrel comprises a mounting hole, a pressure transmission hole, a fixing groove and a sealing element mounting groove, and a rupture disc can be mounted in the mounting hole; the pressure transmission hole and the mounting hole can transmit the pressure inside the power mandrel. The device includes urceolus, power dabber, rupture disc, mounting, first sealing member, second sealing member and third sealing member, and the power dabber sets up in the inner cavity of integration urceolus, is provided with first seal groove, biography pressure hole, fixed slot, second seal groove and the third seal groove that distributes along the axial in proper order on the power dabber outer wall, can form inclosed first ring chamber space and second ring chamber space between power dabber and rupture disc, the urceolus. The beneficial effects of the invention include: the change of the tool state can be met while the external integration of the downhole tool is realized.)

1. An internal pressure type power mandrel is characterized in that the inner wall of the power mandrel is provided with a mounting hole, the outer wall of the power mandrel is provided with a pressure transmission hole, a fixing groove and a sealing element mounting groove, wherein,

the mounting hole can be internally provided with a rupture disc;

The pressure transmission hole is communicated with the mounting hole and can transmit the pressure in the power mandrel;

the fixing groove can be used for installing a fixing piece so as to fix the power mandrel;

The sealing element mounting groove can be used for mounting a sealing element so as to realize sealing between the power mandrel and the outer barrel.

2. The internal pressure type power mandrel as claimed in claim 1, wherein the outer wall of the power mandrel is further provided with a mandrel butt groove for connecting other components capable of being connected with the power mandrel.

3. the internal pressure type power mandrel as claimed in claim 1, wherein the sealing member mounting groove comprises a first sealing groove, a second sealing groove and a third sealing groove which are sequentially distributed on the outer wall, the middle part and the lower part of the power mandrel along the axial direction, the fixing groove is arranged at the lower part of the pressure transmitting hole, wherein,

The first sealing groove is positioned at the upper part of the pressure transfer hole, and the second sealing groove is positioned at the lower part of the fixing groove.

4. a downhole power device for well testing and completion is characterized by comprising an outer barrel, a power mandrel, a rupture disc, a fixing piece, a first sealing piece, a second sealing piece and a third sealing piece, wherein,

the power mandrel is arranged in the inner cavity of the outer barrel, the inner wall of the power mandrel is provided with a mounting hole, the outer wall of the power mandrel is provided with a first sealing groove, a pressure transmission hole, a fixing groove, a second sealing groove and a third sealing groove which are sequentially distributed along the axial direction, and the pressure transmission hole is communicated with the mounting hole so as to transmit the pressure in the power mandrel;

A rupture disc is mounted in the mounting hole;

the fixing piece is arranged in the fixing groove to fix the power mandrel;

The first sealing element, the second sealing element and the third sealing element are respectively arranged in the first sealing groove, the second sealing groove and the third sealing groove to realize sealing between the power mandrel and the outer barrel, a closed first annular cavity space can be formed by the first sealing element, the second sealing element, the rupture disc, the pressure transmission hole, part of the inner wall of the outer barrel and part of the outer wall of the power mandrel, and a closed second annular cavity space can be formed by the second sealing element, the third sealing element, part of the inner wall of the outer barrel and part of the outer wall of the power mandrel.

5. the downhole power unit for testing and completing of claim 4 wherein the outer barrel comprises an integral outer barrel.

6. The downhole power unit for testing completions of claim 4, wherein the fixture comprises a plurality of shear pins.

7. The downhole power unit for testing completions of claim 4, wherein the first, second and third seals each comprise an O-ring seal.

8. The downhole power unit for testing well completion according to claim 4, further comprising a shock absorber disposed on an inner wall of the outer barrel to absorb an impact force when the power mandrel moves within the outer barrel.

9. A downhole power unit for testing completions according to claim 8, wherein the shock absorbing member is located in the second annular cavity space.

10. The downhole power unit for testing completions of claim 4, wherein the power mandrel is of a full bore design.

Technical Field

the invention relates to the field of oil testing well completion, in particular to an internal pressurization type power mandrel and an underground power device for oil testing well completion.

Background

At present, the downhole tool which changes the state of the tool through a pressurization mode in the oil testing and well completion process so as to meet the working condition required by oil testing is widely applied on site and has mature technology. In the prior art, before the state of the downhole tool which changes the state of the tool through pressurization is not changed, the rupture disc of the rupture disc outer cylinder isolates the power chamber from hydrostatic pressure, and once the rupture disc is ruptured, the pressure difference between the annular space and the air chamber serves as power to push the power mandrel to move, so that the purpose of changing the state of the tool is achieved.

After the external rupture disc of the tool is ruptured, the power chamber is communicated with annular hydrostatic pressure, the annular pressure change is transmitted to the inside of the tool, and the power chamber and the annular hydrostatic pressure of the tool are sealed by the support rings at the upper end and the lower end of the mandrel and the sealing piece. However, the tool is usually deep in the wellbore and is usually accompanied by a high temperature, high pressure, acidic environment, which presents a severe challenge to the seal reliability; once the seal is failed, the tubing is communicated with the annular channel, which can cause unpredictable influence on later engineering.

Disclosure of Invention

In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the objectives of the present invention is to provide an internal pressurization type power mandrel and a downhole power device for oil testing completion, so as to realize external integration of downhole tools and simultaneously meet the requirements of tool state change.

in order to achieve the above object, an aspect of the present invention provides an internal pressure type power mandrel.

The inner wall of the power mandrel can be provided with a mounting hole, the outer wall can be provided with a pressure transmission hole, a fixing groove and a sealing element mounting groove, wherein,

The mounting hole can be internally provided with a rupture disc; the pressure transmission hole is communicated with the mounting hole and can transmit the pressure in the power mandrel; the fixing groove can be used for installing a fixing piece so as to fix the power mandrel; the sealing element mounting groove can be used for mounting a sealing element so as to realize sealing between the power mandrel and the outer barrel.

in an exemplary embodiment of the internal pressure type power mandrel of the present invention, the outer wall of the power mandrel may further be provided with a mandrel butting groove for connecting other components capable of being connected with the power mandrel.

in an exemplary embodiment of the internal pressure type power spindle of the present invention, the sealing member mounting groove may include a first sealing groove, a second sealing groove, and a third sealing groove which are sequentially distributed on an outer wall of the power spindle in an axial direction, and the fixing groove may be disposed at a lower portion of the pressure transmission hole, wherein,

The first sealing groove may be located at an upper portion of the pressure transfer hole, and the second sealing groove may be located at a lower portion of the fixing groove.

In another aspect, the invention provides a downhole power device for testing and completing a well.

The device may include an outer barrel, a powered mandrel, a rupture disc, a securing member, a first seal, a second seal, and a third seal, wherein,

the power mandrel can be arranged in the inner cavity of the outer barrel, the inner wall of the power mandrel can be provided with a mounting hole, the outer wall of the power mandrel can be provided with a first sealing groove, a pressure transfer hole, a fixing groove, a second sealing groove and a third sealing groove which are sequentially distributed along the axial direction, and the pressure transfer hole can be communicated with the mounting hole so as to transfer the pressure in the power mandrel; a rupture disc is mountable within the mounting aperture; the fixing piece can be arranged in the fixing groove to fix the power mandrel;

The first sealing element, the second sealing element, the third sealing element are respectively arranged in the first sealing groove, the second sealing groove and the third sealing groove to realize the sealing between the power mandrel and the outer cylinder, and the first sealing element, the second sealing element, the rupture disc, the pressure transmission hole, part of the inner wall of the outer cylinder and part of the outer wall of the power mandrel can form a closed first annular cavity space,

The second sealing element, the third sealing element, part of the inner wall of the outer cylinder and part of the outer wall of the power mandrel can form a closed second annular cavity space.

In an exemplary embodiment of the downhole power unit for test run completion of the present invention, the outer barrel may comprise an integrated outer barrel.

in an exemplary embodiment of a downhole power unit for test completion of the present invention, the fixture may comprise a number of shear pins.

In an exemplary embodiment of the downhole power unit for test completion of the present invention, the first, second and third seals may each comprise an O-ring seal.

In an exemplary embodiment of the downhole power device for testing oil and completing well of the present invention, the downhole power device may further comprise a shock absorbing member disposed on an inner wall of the outer cylinder to absorb an impact force when the power mandrel moves within the outer cylinder.

in an exemplary embodiment of the downhole power unit for test completion of the invention, the shock absorbing member may be located in the second annular cavity space.

in an exemplary embodiment of the downhole power unit for test completion of the present invention, the power mandrel may be of a full-bore design.

Compared with the prior art, the beneficial effects of the invention can include: the internal pressurization mode can also reach the purpose that the instrument itself does not take place the drunkenness when realizing the state change of instrument to the operating mode, has guaranteed the integrality of whole oil test tubular column, reduces because of the risk that the instrument drunkenness influences pit shaft integrality.

Drawings

The above and other objects and features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 shows a schematic structural view of a powered spindle in an exemplary embodiment of the invention;

FIG. 2 shows a schematic representation of a downhole power unit in an exemplary embodiment of the invention;

FIG. 3 shows a schematic view of the power spindle descending in an exemplary embodiment of the invention;

Description of the main reference numerals:

1. the sealing structure comprises a first sealing groove, 2, a pressure transmission hole, 3, a mounting hole, 4, a fixing groove, 5, a second sealing groove, 6, a third sealing groove, 7, a mandrel butt joint groove, 8, an outer cylinder, 9, a first sealing element, 10, a rupture disc, 11, a first annular cavity space, 12, a fixing element, 13, a second sealing element, 14, a damping element, 15, a third sealing element, 16 and a second annular cavity space.

Detailed Description

Hereinafter, the internal pressure type power mandrel and the downhole power device for oil testing according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

The invention provides an internal pressurization type power mandrel.

In an exemplary embodiment of the present invention, as shown in fig. 1, the power mandrel may be a structure penetrating both ends, wherein,

The inner wall of the power mandrel may be provided with mounting holes 3 for mounting rupture discs 10.

the outer wall of the power mandrel can be provided with a pressure transmission hole 2, a fixed groove 4 and a sealing element mounting groove, wherein,

The pressure transmitting hole 2 can be communicated with the mounting hole 3, and when the rupture disk is broken, the pressure from the interior of the power mandrel can be transmitted outwards through the mounting hole 3 and the pressure transmitting hole 2.

The holding groove 4 may be used for mounting a fixing member which may be used for fixing the power mandrel when the rupture disc is not broken, the holding groove 4 may be located at the lower portion of the pressure transmitting hole 2, and the fixing member may include a plurality of shear pins, for example, two.

The sealing element mounting groove can be used for mounting a sealing element to realize sealing between the power mandrel and the outer cylinder, the sealing element mounting groove can comprise a first sealing groove 1, a second sealing groove 5 and a third sealing groove 6 which are sequentially distributed on the outer wall of the power mandrel along the axial direction, and the sealing element can comprise an O-shaped sealing ring. Furthermore, the power mandrel can also comprise a plurality of support rings, and one sealing ring can correspond to two support rings, namely the support rings can be arranged on two sides of the O-shaped sealing ring, so as to improve the sealing pressure of the O-shaped sealing ring.

In this embodiment, the first seal groove 1 may be located at an upper portion of the pressure transfer hole 2, and the second seal groove 5 may be located at a lower portion of the fixing groove 4.

In this embodiment, the outer wall of the power mandrel may further be provided with a mandrel butting groove 7, and the mandrel butting groove 7 may be located at the lower portion of the third sealing groove 5 and may be used to connect other components that can be connected to the power mandrel, so that different functions are realized through different components.

In this embodiment, the buckling type processing of the power mandrel conforms to the oil and gas industry standard, can be matched with the currently common oil industry standard buckling type, is directly connected, and is convenient to use.

In another aspect, the invention provides a downhole power device for testing and completing a well.

In an exemplary embodiment of the present invention, as shown in fig. 2, the power unit may include an outer cylinder 8, a power spindle, a rupture disc 10, a fixing member 12, a first sealing member 11, a second sealing member 13, and a third sealing member 15, wherein,

The urceolus 8 can include the urceolus that the urceolus welding of a plurality of integrated structures formed, furtherly, also can include the urceolus of an integration, the both ends of power dabber can be for the structure that link up, both ends all have the opening promptly, the power dabber sets up in the inner cavity of integration urceolus 8, can be provided with mounting hole 3 on the inner wall of power dabber, first seal groove 1 can have set gradually along the axial on the outer wall, pass and press hole 2, fixed slot 4, second seal groove 5 and third seal groove 6, pass and press hole 2 can communicate with mounting hole 3, with the inside pressure of transmission power dabber.

a rupture disc 10 may be mounted in the mounting hole 3.

a fixing member 12 may be installed in the fixing groove 4 for preventing the power mandrel from being displaced and varied due to unstable factors such as shaking before the rupture disk 10 is broken, and the fixing member may include a plurality of shear pins, for example, two shear pins.

The first sealing element, the second sealing element and the third sealing element can be respectively arranged in the first sealing groove, the second sealing groove and the third sealing groove to realize sealing between the power mandrel and the outer cylinder, a closed first annular cavity space can be formed by the first sealing element, the second sealing element, the rupture disc, the side wall on the pressure transmission hole, the partial inner wall of the outer cylinder and the partial outer wall of the power mandrel, a closed second annular cavity space can be formed by the second sealing element, the third sealing element, the partial inner wall of the outer cylinder and the partial outer wall of the power mandrel, the first sealing element, the second sealing element and the third sealing element can respectively comprise an O-shaped sealing ring and a supporting ring, and the supporting rings are arranged on two sides of the O-shaped sealing rings and can be used for improving the sealing pressure.

In this embodiment, as shown in fig. 2, the power device may further include a shock absorbing member 14 disposed on the inner wall of the outer cylinder, and the shock absorbing member may be used to buffer the impact force generated when the power mandrel moves in the outer cylinder, reduce the shock, and increase the stability.

in this embodiment, the power mandrel may be designed with a full bore, which is consistent with the inner diameter of other tools, and may be used in a variety of downhole tools (which may include circulation valves, test valves, and samplers) commonly used at present, and all of which are related to testing and available for direct connection.

In this embodiment, when this device is in initial state, the internal rupture disk of placing in the rupture disk mounting hole can be isolated ring cavity structure and the outside pressure of device, and the initial state before the holding device no longer need carry out the operating mode and change. When the device is required to work, the rupture disc can be broken through a pressurization mode in an oil pipe, at the moment, as shown in figure 3, the pressure transmitting hole transmits pressure transmitted from the interior of the device to the annular cavity structure, after the pressure is transmitted, pressure difference is formed between the first annular cavity space and the second annular cavity space, the mandrel is pushed to move downwards, the mandrel downwards shears the shearing pin, and then the shearing pin continuously downwards shears the underground tool, so that the underground tool is opened and closed.

In summary, the advantages of the internal pressure type power mandrel and the downhole power device for oil testing and well completion of the present invention may include: the underground power device adopting the internal pressurization mode has the advantages that the rupture disc is arranged on the power mandrel, pressure transmission holes are not needed on the outer cylinder, the sealing of the tool is all metal sealing, and rubber sealing is not needed, so that the leakage possibility is fundamentally avoided. Meanwhile, the mode of pressurizing in the oil pipe achieves the purpose that the tool does not generate the leakage when the state of the tool is changed aiming at the working condition, the integrity of the whole oil testing pipe column is ensured, and the risk that the integrity of a shaft is influenced by the leakage of the tool is reduced.

In the description of the present invention, it is to be understood that the positional indications or positional relationships are based on those shown in the drawings and are for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.

Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.