Automatic switching three-way circulation joint for oil well
An automatic switching and oil well technology, which is applied in the direction of flushing wellbore, wellbore/well components, wellbore/well valve device, etc., which can solve the inconvenience of downhole circulation operation and well washing operation, adverse effects on oil well production, and unfavorable oil well production cost and other issues, to achieve the effect of reducing the workload, reducing the development cost and prolonging the service life
Inactive Publication Date: 2007-12-12
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
When the crude oil production resumes again, the crude oil production operation must be lowered into a new circulation joint by tripping the pipe string, which not only brings great inconvenience to the downhole circulation operation and well cleaning operation, but also frequently carries out such Wireline operations and tripping string operations take up a lot of operating time and have a negative impact on the production of oil wells
In addition, it is very difficult to mechanically cut off the shear pins and open the circulation joints during downhole operations and well cleaning operations in heavy oil wells with high viscosity. reduce
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[0024] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:
[0025] Please refer to Fig. 1 and Fig. 2, the automatic switching tee circulation joint for oil wells, including the tee circulation joint body 2, the oil pipe inner channel 1, the reverse circulation channel 3 and the tee short circuit are arranged on the upper part of the tee circulation joint body 2 Outlet 5, the lower part of the three-way circulation joint body is provided with a three-way short-circuit lower inlet 11, the three-way short-circuit upper outlet 5 is connected to the reverse circulation channel 3, the reverse circulation channel is connected to the annular space 4, and the three-way short-circuit is connected to the lower inlet 11 communicate with the upper outlet 5 of the tee short-circuit through the channel notch 8 to for...
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The invention discloses an oil well self-switching three-way circulation joint, which comprises the following parts: inner channel of oil pipe on the inner top of three-way circulation joint, reverse circulation channel and three-way short-circuit upper outlet, three-way short-circuit lower outlet in connection with the three-way circulation joint body, three-way circulation channel of three-way short-circuit lower outlet in connection with the three-way short-circuit upper outlet, sealing plug movement channel body in the three-way circulation joint, sealing plug device in the sealing plug movement channel, fixation plate under the sealing plug movement channel, channel groove opening around the circumferential wall of sealing plug movement channel. The invention realizes the free switching of oil well product, reverse circulation and positive circulation channels, which is fit for high viscosity dense oil well.
Description
technical field [0001] The invention belongs to downhole production tools for petroleum and natural gas wells, in particular to an automatic switching tee circulation joint for oil wells, which is simple in operation, quick in operation and long in service life, and is suitable for frequently changing production operation modes in the petroleum production process. Background technique [0002] In the process of oil extraction and production, electric pump wells are widely used for oil production. However, due to the complex well conditions, downhole circulation operations or well washing operations are generally required during the production process. For circulation operations, positive circulation operations are required, and sometimes reverse circulation operations are required. Operation, in the face of the current known oil well circulation joint is the use of steel wire operation and tripping string operation, its working principle is: when the oil well is in normal pro...
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IPC IPC(8): E21B34/08E21B21/10E21B43/00
Inventor 苏杰陈建兵于小龙蒋慰兴巩立根
Owner CHINA NAT OFFSHORE OIL CORP