阅读说明：本技术 一种用于试油完井的内压控制井下工具 (Internal pressure control downhole tool for oil testing well completion ) 是由 陈华良 贾海 黄船 谢胜 潘登 朱铁栋 贺秋云 张洋 蔡佳成 曾胜 于 2019-09-30 设计创作，主要内容包括：本发明提供了一种用于试油完井的内压控制式井下工具。所述工具包括内置的动力装置,动力装置包括外筒、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,传压孔与安装孔连通,以传递动力芯轴内部的压力,固定件安装在所述固定槽内,第一、第二、第三密封件分别安装在第一、第二、第三密封槽内以实现动力芯轴与外筒之间的密封,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 pressure control type downhole tool for oil testing well completion. The tool comprises a built-in power device, the power device comprises 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, the power mandrel is arranged in an inner cavity of the integrated outer barrel, a first sealing groove, a pressure transmission hole, a fixing groove, a second sealing groove and a third sealing groove are sequentially arranged on the outer wall of the power mandrel along the axial direction, the pressure transmission hole is communicated with the mounting hole to transmit the pressure inside the power mandrel, the fixing piece is installed in the fixing groove, the first sealing piece, the second sealing piece and the third sealing piece are respectively installed 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, and a first closed annular cavity space and a second annular cavity space can be formed between the power mandrel and the rupture disc and the outer. 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 control downhole tool for oil testing well completion is characterized by comprising a built-in power device, wherein the power device comprises 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,

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.

2. The downhole tool for testing internal pressure for completion of a well according to claim 1, wherein the outer barrel comprises an integral outer barrel.

3. The downhole tool for controlling internal pressure of oil testing completion as claimed in claim 1, wherein the outer wall of the power mandrel is further provided with a mandrel docking groove, and the mandrel docking groove is located at the lower part of the third sealing groove for connecting other components capable of being connected with the power mandrel.

4. The downhole tool for testing internal pressure control of a well completion according to claim 1, wherein the fixture comprises a plurality of shear pins.

5. The downhole tool for testing internal pressure control of a well completion according to claim 1, wherein the first, second and third seals each comprise O-rings.

6. The downhole tool for testing internal pressure of a well completion according to claim 1, wherein the downhole power unit further comprises a shock absorber disposed on an inner wall of the outer cylinder to absorb an impact force when the power mandrel moves within the outer cylinder.

7. The downhole tool for testing internal pressure of a well completion according to claim 6, wherein the shock absorber is located within the second annular space.

8. The downhole tool for testing internal pressure control of a well completion according to claim 1, wherein the power mandrel is of a full bore design.

9. The internally pressurized downhole tool for testing of oil of claim 1, wherein the downhole tool comprises a circulation valve, a test valve, or a sampler.

Technical Field

The invention relates to the field of oil testing well completion, in particular to an internal pressure control downhole tool 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.

Because this kind of outside rupture disc of instrument breaks the back, power cavity communicates with annular space hydrostatic pressure, and annular space pressure changes and will transmit to inside the instrument, and instrument power cavity and annular space hydrostatic pressure lean on the mandrel upper and lower both ends sealing ring to seal. 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, it is an object of the present invention to provide an internal pressure control downhole tool for well testing completion to allow for external integration of the downhole tool while satisfying changes in tool conditions.

To achieve the above objects, the present invention provides an internal pressure control downhole tool for use in a test completion.

The tool may include a built-in power device that may include an outer barrel, a power 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 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 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.

In an exemplary embodiment of the invention, the outer barrel may comprise an integral outer barrel.

In an exemplary embodiment of the invention, the outer wall of the power mandrel may be further provided with a mandrel docking groove, and the mandrel docking groove may be located at a lower portion of the third sealing groove to connect other components capable of being connected with the power mandrel.

In a first exemplary embodiment of the present invention, the fixture may include a number of shear pins.

In a first exemplary embodiment of the present invention, the first, second and third seals may each comprise an O-ring seal.

In the first exemplary embodiment of the present invention, the downhole power unit may further include 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 the first exemplary embodiment of the present invention, the shock absorbing member may be located in the second annular chamber space.

In a first exemplary embodiment of the present invention, the powered spindle may be of a full-bore design.

In a first exemplary embodiment of the invention, the downhole tool may comprise a circulation valve, a test valve or a sampler.

Compared with the prior art, the beneficial effects of the invention can include: the mode that adopts internal pressurization realizes that the instrument can not take place the drunkenness to the state change of operating mode when can also reaching the instrument itself. The integrity of the whole oil testing pipe column is protected, and the risk that the integrity of a shaft is influenced by tool leakage is reduced.

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 control downhole tool for test completion of the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

The invention provides an internal pressure control downhole tool for oil testing well completion.

In an exemplary embodiment of the present invention, the tool includes a built-in power device, as shown in fig. 2, the power device may include an outer cylinder, a power mandrel, a rupture disc, a fixing member, a first sealing member, a second sealing member and a third sealing member, wherein the power mandrel may be a structure penetrating through two ends, and the outer cylinder may include a plurality of outer cylinders welded together to form an integrated outer cylinder, and further, may include an integrated outer cylinder.

The power mandrel can be arranged in an inner cavity of the outer barrel, as shown in fig. 1, a mounting hole can be formed in the inner wall of the power mandrel, a first sealing groove, a pressure transmission hole, a fixing groove, a second sealing groove and a third sealing groove can be sequentially formed in the outer wall in the axial direction, and the pressure transmission hole can be communicated with the mounting hole to transmit the pressure inside the power mandrel.

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 barrel, 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, a part of inner wall of the outer barrel and a part of outer wall of the power mandrel, a closed second annular cavity space can be formed by the second sealing element, the third sealing element, a part of inner wall of the outer barrel and a part of outer wall of the power mandrel, and the first sealing element, the second sealing element and the third sealing element can comprise O-shaped sealing rings. 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 and can be used for improving the sealing pressure of the O-shaped sealing ring.

In this embodiment, the pressure transmission hole may be located between the first and second seal grooves and communicate with the mounting hole to transmit the pressure inside the power spindle to the first annular cavity space.

In this embodiment, a rupture disc may be mounted within the mounting hole to maintain the first annular chamber space in a sealed condition.

In this embodiment, a fixing groove may be formed at a lower portion of the pressure transfer hole, and a fixing member may be installed in the fixing groove to prevent the power spindle from being displaced due to an unstable factor such as shaking before the rupture disk is broken, and the fixing member may include a plurality of shear pins, for example, two shear pins.

In this embodiment, the spindle docking slot may be used to connect other components on the lower portion of the power spindle that mate with the power spindle to perform different functions depending on the component.

In this embodiment, the power device may further include a damping member disposed on an inner wall of the outer cylinder, and the damping member may be configured to cushion an impact force generated when the power mandrel moves in the outer cylinder, reduce vibration, and increase 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 the device is in the initial state, the rupture disk built in the rupture disk mounting hole can isolate the pressure in the first annular cavity space and the power mandrel, and the first annular cavity space and the second annular cavity space are in pressure balance, so that the device can keep the initial state. 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 the pressure transmitted from the interior of the device to the first annular cavity space, after the pressure is transmitted, the first annular cavity space and the second annular cavity space form a pressure difference, the mandrel is pushed to move downwards, the shearing pin is sheared downwards by the mandrel, then the mandrel continues to move downwards, the purpose of opening and closing the underground tool is achieved, and at the moment, different functions can be achieved according to different functional parts connected with the mandrel butt joint groove.

In this embodiment, when the downhole tool is a circulating valve, in a test oil completion, after the internal pressurization type circulating valve is lowered into a well along with a test tool to a predetermined position, when the downhole tool needs to be opened and closed, a pump is started to inject liquid into an oil pipe, hydraulic pressure in the oil pipe acts on a rupture disc, the rupture disc is opened after certain pressure is reached, and the pressure reaches a first annular cavity space through a mounting hole and a pressure transfer hole, so that the pressure acts on a power mandrel, a downward shearing shear pin is cut, and a radial or lateral opening and closing function is realized.

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.

In summary, the internal pressure control downhole tool for well testing completion of the present invention may have the following advantages: the underground power device adopting the internal pressurization mode is characterized in that the rupture disc is arranged on the power mandrel, the outer cylinder is processed in an integrated forming mode, pressure transmission holes are not needed in the outer cylinder, the tool is sealed by metal, and rubber pieces are not needed, so that the possibility of leakage is fundamentally eliminated. 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. .

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.