Layered gas injection safety joint and method of use thereof
A technology of safety joints and gas injection pipes, which is applied in the direction of earthwork drilling, mining fluids, drilling equipment, etc., can solve the problems of not being able to lose hands, and achieve the effect of large lifting load
Active Publication Date: 2018-05-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
There is another problem with such a safety joint when it is applied to a layered gas injection completion string. When the inner diameter of the string is limited and the ball cannot be thrown, it cannot be dropped.
Method used
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Embodiment Construction
[0022] In the present invention, for the convenience of description, the description of the relative positional relationship of each component is described according to the layout of the drawings in the specification, such as: the positional relationship of upper, lower, upper, lower, etc. is based on the drawings in the specification determined by the layout direction.
[0023] see figure 1 and figure 2 , layered gas injection safety joint, the upper end of the cylinder liner 2 is connected with the upper joint 1, the piston 8 is placed in the annular space formed by the cylinder liner 2 and the upper joint 1, and the piston 8, the upper joint 1, and the cylinder liner 2 are respectively arranged sealing ring.
[0024] A locking mechanism 1 20 is arranged between the piston 8 and the upper joint 1 .
[0025] The locking mechanism-20 can be a zigzag thread locking mechanism, such as figure 1 and Figure 6 As shown, the zigzag thread locking mechanism is composed of an in...
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The invention relates to the technical field of oil field downhole tool safety joints used for layered oil production completion pipe strings. A piston is arranged in an annular space between the upper end of a cylinder sleeve and an upper joint, and a locking mechanism and a start shear pin are arranged between the piston and the upper joint; a connecting pipe is connected with the cylinder sleeve, the lower portion of a protective sleeve is arranged outside the connecting pipe in a sleeving mode, the protective sleeve is connected with the piston, a second locking mechanism is arranged between the protective sleeve and a releasing pipe, and an upper releasing mechanism is arranged between the releasing pipe and the connecting pipe; a lower joint stretches into the lower end of the connecting pipe, a lower releasing mechanism is arranged between the lower joint and the releasing pipe, and a releasing shear pin is arranged between the lower joint and the connecting pipe. According to the using steps, the device is installed between two packers; hydraulic pressure is applied to shearing off the start shear pin; a pipe string is lowered; a gas injection pipe string releasing device is lifted up. As the two sets of releasing mechanisms are designed, the device well meets the requirements for descending the pipe string in a well, setting and unsetting the packers, releasing the stuck packers and the like when used in the layered completion pipe string.
Description
technical field [0001] The invention relates to the technical field of safety joints of downhole tools for layered oil production in oilfield exploitation technology, and more specifically relates to a safety joint for layered gas injection and a use method thereof. Background technique [0002] In recent years, CO 2 Oil displacement technology has been vigorously developed at home and abroad, and gas injection technology is an important part of this technology. In order to reduce the mutual interference between oil layers and improve oil recovery, the research and application of layered gas injection technology has been carried out. [0003] Downhole layered injection-production strings are generally equipped with downhole packers, and layered gas injection technology is no exception. It is necessary to install packers above and below the oil layer, at least two packers. To ensure that the packer and gas injection device can be safely put into the downhole, installed and ...
Claims
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IPC IPC(8): E21B17/06E21B43/16
CPCE21B17/06E21B43/164
Inventor 王世杰刘建新张瑞霞魏伟韩博岳广韬赵小龙
Owner CHINA PETROLEUM & CHEM CORP