Downhole Separating Device Mechanical Release Mechanism
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Solution Overview
Problem
Downhole separating devices in the prior art fail to adapt to various working conditions and effectively transmit torque during drilling, particularly in gas-liquid medium drilling, limiting their application.
Innovation Solution
A controllable downhole drilling and completion tool separating device comprising an upper mandrel connector, outer sleeve, claw clamp sleeve, claw clamp locking ring, mandrel sleeve, piston ring, and pressure bearing ball, which allows for torque transmission and reliable separation through a hydraulic piston ring structure, enabling operation in both liquid and gas drilling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic pin shearing mode is used for separation, then separation can be achieved, but reliability is reduced due to faults such as advanced separation
Solution Approach 1:
The patent replaces the traditional hydraulic pin shearing mechanism with a mechanical releasing mechanism consisting of a releasing auger, releasing blade, and locking components. This mechanical system eliminates the reliability issues of hydraulic pin shearing (such as advanced separation) while maintaining separation functionality through pure mechanical engagement and disengagement of the auger and blade components
Solution Approach 2:
The separating device is divided into distinct functional modules: the upper drill string connector with releasing auger, the lower drill string connector with locking blade, and the connecting section. This segmentation allows each component to perform its specific function independently, improving overall reliability while enabling controlled separation through the interaction of these segmented parts
2Adaptability or versatility
If mechanical releasing devices are used, then torque transmission can be achieved, but adaptability to various working conditions is limited
Solution Approach 1:
The releasing mechanism is designed with multi-functionality to handle various working conditions: it can transmit torque during drilling operations, enable controlled separation when needed, and adapt to different drill string configurations. The releasing auger and blade system can operate in both torque transmission mode and separation mode, making the device universal for multiple drilling and completion operations without requiring additional specialized components
3Force
If hydraulic separating devices are used, then separation can be achieved, but torque transmission capability is insufficient
Solution Approach 1:
The patent replaces the hydraulic separation mechanism with a purely mechanical releasing system where the releasing auger engages with the locking blade through mechanical threads and surfaces. This mechanical interaction provides superior torque transmission capability compared to hydraulic systems, as the threaded engagement of the auger with the blade creates strong mechanical interlocking that can withstand high torsional loads while maintaining reliable separation functionality
4Stress or pressure
If conventional releasing methods are used in gas drilling, then separation may be achieved, but pressure is not enough to shear off the pins
Solution Approach 1:
The patent replaces the pin shearing mechanism (which relies on hydraulic pressure to shear pins) with a mechanical releasing system using the releasing auger and locking blade. In gas drilling conditions where pressure is insufficient to shear pins, this mechanical system provides an alternative release mechanism where the auger can be rotated to engage or disengage the locking blade, enabling reliable separation without depending on high pressure to shear pins
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device provides reliable separation and torque transmission, reducing the number of pipe string trips and labor costs, and is applicable to various well types, including straight, inclined, and horizontal wells, while avoiding complex operations like sidetrack drilling.
Implementation Method 1
liquid under the increased pressure from the upper part enters the lower part of the piston ring (7) through the bypass hole (101) to push the piston ring (7) to move upward
Implementation Method 2
The cooperation of the downhole separating device and completion tools such as packers can realize drill-pipe pre-completion
Data Source
AI summary
A controllable downhole drilling and completion tool separating device and their method of use are provided. The device includes an upper mandrel connector, an outer sleeve, a claw clamp sleeve, a claw clamp locking ring, a mandrel sleeve, a lower connector, a piston ring and a pressure bearing ball. The upper end of the lower connector is on the outer side of the upper connector in a sleeving mode. A first annular cavity is between the lower connector and the upper connector. The piston ring is on the outer side of the upper connector in a sleeving mode and located in the first annular cavity. The claw clamp sleeve and the outer sleeve are sequentially arranged on the outer side of the upper connector in a sleeving mode. A second annular cavity is communicated with the first annular cavity and formed between the claw clamp sleeve and the upper connector.