Method and means for providing time delay in downhole well operations
An in-operation and action technology, applied in earth-moving drilling, wellbore/well components, construction, etc., can solve problems such as difficulty in controlling the tensioning spring time, unsuitable for fine-tuning, and poor control of the force-generating mechanism.
Inactive Publication Date: 2010-06-09
WELL INNOVATION
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Problems solved by technology
A rope can be used to tension the spring, but the time it takes to tension the spring is difficult to control because the force transmitted through the rope can be weakened by friction, stretching, etc.
In addition, the force-generating mechanism is poorly controlled and therefore unsuitable for fine-tuning
Method used
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Embodiment Construction
[0014] The present invention provides a time-delay hydraulic system based on the flow characteristics of substantially Newtonian fluids.
[0015] Figure 1a with Figure 3a A portion of two variants of the tool providing hydraulic load compensation delay are shown. The relative axial force acting between the piston rod 1 and the cylindrical piston housing 2 causes a pressure build-up in one of the two hydraulic chambers 3, 4, the piston housing 2 enclosing the piston rod 1, the hydraulic chamber 3, 4 4 are filled with an incompressible liquid, and the relative movement between the piston rod 1 and the piston housing 2 causes liquid to drain from one chamber 3 to the other chamber 4, or from chamber 4 to chamber 3. Between the piston rod 1 and the piston shell 2, a horizontal floating hydraulic piston sleeve 5 is provided. The horizontal floating hydraulic piston sleeve 5 is respectively supported on each side of the piston sleeve ear by a spring. The axial movement between t...
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The present invention relates to a means and method for providing hydraulic load compensated time delay in downhole well operations. The means according to the invention is characterized in that it includes a piston stem (1) enclosed by a piston housing (2), wherein the means is adapted in such a manner that an axial force, acting either in the direction of stretch or in the direction of compression, causes a pressure buildup in one of two hydraulic chambers (3, 4) which are each filled with an incompressible liqui d and which are mutually connected through one or more throttle orifices (8), wherein a sideways floating, supported piston sleeve (5) is arranged between the piston stem (1 ) and the piston housing (2), wherein the piston sleeve ( 5) is adapted to control the differential pressure across the throttle orifice( s) (8) in such a manner that an increasing axial force acting on the means will , in a predetermined manner, increase the differential pressure across the throttle orifice(s) and hence delay the flow-through of the incompressible liquid from one of the to hydraulic chambers (3, 4) to the second chamber (4 , 3), which also causes a predetermined delay of the relative movement between the piston stem (1) and the piston housing (2).
Description
technical field [0001] The invention relates to a device for hydraulic load compensation time delay. Background technique [0002] In downhole operations, there is often a need for a device that can provide a predetermined time delay with respect to the actuation or activation of a tool that is to perform certain work in the well. Typically, these devices can only be actuated with tensile and / or compressive forces, for example by cord operation. [0003] It would be more desirable to be able to predict the time delay, which is a challenge when, eg, with long ropes, the force exerted on the time delay device may be difficult to control. It would be advantageous to be able to minimize the factors affecting the delay duration obtained in each case, thereby simplifying the calculation of the hold times necessary to achieve a particular tool function. By compensating the delay-generating device for variations in the force applied to the device, a delay that is as constant as po...
Claims
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IPC IPC(8): E21B31/113E21B
Inventor 弗兰克·阿克塞尔博格
Owner WELL INNOVATION