Tubular pile dragging device
A technology of tractor and pipe string, which is applied in the direction of wellbore/well parts, earthwork drilling and production, etc. It can solve the problems that hinder the development of extended-reach wells and horizontal wells, and the difficulty of running pipe strings. It achieves good results, convenient manufacture, work reliably
Inactive Publication Date: 2011-11-16
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
The difficulty of running pipe strings hinders the development of extended reach wells and horizontal wells
Method used
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[0066] The pipe string tractor mainly includes pipe string shorting 1, controller 3, first valve 2, second valve 4, third valve 5, fourth valve 6, bypass channel 10, body 14, piston assembly 13, piston rod Assembly 9, first hydraulic cylinder 11, second hydraulic cylinder 12, well wall fixer 7, anchor fluke 16. The pipe string short 1 is a part of the body 14, and it is connected with the front end of the pipe string to be lowered during operation. The piston assembly 13 is placed in the hydraulic cylinder. The piston rod assembly 9 connects the piston assembly 13 and the well wall holder 7 together. There is a channel 15 in the piston rod assembly 9, through which the fluid in the first hydraulic cylinder 11 can enter the inner cavity of the well wall holder 7. A bypass passage 10 is provided between the pipe string short 1 and the first hydraulic cylinder 11 , which makes the fluid in the first liquid cylinder 11 communicate with the fluid in the pipe string short 1 . The...
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The invention provides a column jacket retractor which is beneficial to a down column jacket during the drilling process. The column jacket retractor mainly includes a short circuit 1 of the column jacket, a controller 3, a first valve 2, a second valve 4, a third valve 5, a fourth valve 6, a bypass channel 10, a body 14, a piston assembly 13, a piston rod assembly 9, a first liquid cylinder 11, a second liquid cylinder 12 and a well wall fixer 7. A ground liquid power pump is utilized to apply pressure on the fluid in the column jacket needed down to lead the first valve 2, the second valve 4, the third valve 5 and the fourth valve 6 to be opened and closed according to a regular sequence through whether the controller 3, the third valve 5 and the fourth valve 6 touch the body 14 or not, so as to lead the fluid to generate pull which is not less than 200kN in the first liquid cylinder 11 to draw the column jacket to move forwards. The invention is especially applicable for the completion work of large displacement wells and horizontal wells and is beneficial to solving the problem that the column jackets of the large displacement wells and horizontal wells are hard for person to get down. The column jacket retractor can be combined to use with other methods that are beneficial to person to get down to the column jackets and has better effect.
Description
technical field [0001] The invention relates to a longer traction device which helps pipe strings to run into a horizontal well section in oil and natural gas drilling engineering. Background technique [0002] In oil and natural gas development projects, in addition to drilling vertical wells, horizontal wells and extended-reach wells are also drilled as required. Horizontal wells and extended-reach wells have outstanding advantages in increasing single well production, improving recovery, and developing oil and natural gas resources. Therefore, the number of this type of wells is increasing day by day, and the horizontal well section is also continuously lengthening. At the same time, the problem of difficulty in running pipe strings in extended-reach wells and horizontal wells has become increasingly prominent. [0003] Usually, the driving force for running the pipe string is mainly gravity. In extended-reach wells and horizontal wells, since the gravity direction of th...
Claims
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IPC IPC(8): E21B23/04
Inventor 陈浩
Owner SOUTHWEST PETROLEUM UNIV