Bi-Parallelogram Pushing Arm for Well Wall Contact
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Solution Overview
Problem
Existing oil exploration tools struggle to measure fluid pressure at lower strata and take samples due to a small contacting area between detectors and the strata, leading to device sticking and uneven contact with the well wall, as well as inadequate load control.
Innovation Solution
A pushing sitting device with a bi-parallelogram structure and high-pressure oil system, featuring multiple pushing arms and piston holes, allows uniform contact with the well wall and controlled load exertion, using high-pressure oil to extend and retract the arms for smooth entry and exit, and includes a detector assembly with a rubber pad and filter net for fluid sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If detectors are driven by piston system with small contacting area, then the device structure is simple, but the device cannot enter or leave the well smoothly and gets stuck easily
Solution Approach 1:
The detector is divided into multiple detection units arranged in an array, each unit having its own piston drive mechanism. This segmentation allows each unit to independently contact the well wall, distributing the contact force and preventing the detector from getting stuck while maintaining structural simplicity of individual units
Solution Approach 2:
The detection units are arranged in a two-dimensional array pattern rather than a single linear row, enabling the detector to contact the well wall across multiple points simultaneously. This dimensional expansion increases the effective contacting area and improves reliability of smooth entry and exit without significantly increasing overall device complexity
2Device complexity
If detectors are driven by piston system, then the device structure is simple, but the detectors are not able to get in touch with the wall of the well uniformly along the circumference
Solution Approach 1:
The detection units are positioned at asymmetric angles around the detector body, specifically arranged to contact the well wall at different circumferential positions. This asymmetric arrangement ensures uniform contact distribution along the circumference while keeping each unit's drive mechanism relatively simple
Solution Approach 2:
Each detection unit is equipped with independent piston drive mechanisms that can dynamically adjust the contact force and position of each unit. This dynamic control allows the detectors to adapt to varying well wall conditions and achieve uniform contact distribution along the circumference
3Device complexity
If detectors are driven by piston system, then the device structure is simple, but the detectors are not able to control the load exerted on the wall
Solution Approach 1:
Each detection unit incorporates sensors that detect the contact force exerted on the well wall and feed this information back to the control system. The control system then adjusts the piston drive mechanisms to maintain optimal load control on the wall, achieving precise force management without requiring complex overall device structure
Solution Approach 2:
The piston drive mechanisms are designed to independently control the position and force parameters of each detection unit. By varying the piston extension distance and oil pressure, the system can precisely control the load exerted on the well wall at different locations, achieving comprehensive load control
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
Enables uniform contact with the well wall, prevents device sticking, and allows for controlled load exertion, facilitating accurate fluid pressure measurement and sample collection while ensuring smooth operation.
Implementation Method 1
one or more main pushing pistons move horizontally at the same time under the pushing of the high pressured oil
Implementation Method 2
under the pressure from high pressured oil (for taking the pushing arms back), the assisting pushing piston rods move horizontally towards the right direction
Data Source
AI summary
A pushing sitting device includes a main base, at least one set of pushing arms are provided on the side surface of the main base. The pushing arm includes a bi-parallelogram, having a first parallelogram structure and a second parallelogram structure. The first parallelogram structure includes a front arm, a detector assembly, an assisting arm and the main base, wherein the front arm is connected to the detector assembly and the main base respectively through joint pins at two ends, while the assisting arm is connected to the detector assembly and the main base respectively through the rotating shafts at two ends. The second parallelogram includes a rear arm, the detector assembly, a nonporous assisting arm and the main base which are connected in sequence by connecting shaft.