Motor-Driven Dual-Piston Extractor for Precise Fluid Sampling
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Solution Overview
Problem
Current downhole formation fluid extraction apparatuses using hydraulic plunger pumps suffer from poor reliability due to electromagnetic valve pollution, high maintenance costs, and imprecision in controlling extraction and discharge volumes, leading to inaccurate sample acquisition.
Innovation Solution
An integrated apparatus with a motor-driven dual-piston extractor system, comprising a housing with fluid and hydraulic oil chambers, a plunger pump, and a lead screw mechanism, allowing precise control of fluid and hydraulic oil pressures to synchronize the extraction of a specified fluid sample volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electromagnetic valve is used to control the reciprocation of a hydraulic plunger pump, then the extraction of formation fluid is enabled, but the reliability of the system deteriorates due to oil pollution of the electromagnetic valve
Solution Approach 1:
The patent replaces the electromagnetic valve control system with a mechanical control system. A mechanical control valve is used to control the reciprocation of the hydraulic plunger pump, eliminating the vulnerability of electromagnetic valves to oil pollution. The mechanical control valve is actuated by a control rod that is mechanically linked to the pump plunger, providing reliable control without electrical components exposed to the hydraulic fluid.
2Productivity
If a hydraulic plunger pump is used for fluid extraction, then the extraction function is achieved, but the precision of controlling extraction volume and discharge volume deteriorates
Solution Approach 1:
The patent incorporates a feedback mechanism through a control rod that is mechanically linked to the pump plunger. The control rod receives feedback information about the pump's reciprocation position and uses this information to precisely control the mechanical control valve, thereby achieving precise control over extraction and discharge volumes. The feedback loop ensures that the control valve opens and closes at the exact moments needed for accurate volume measurement.
3Reliability
If a mechanical control system is used instead of electromagnetic valve, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the control function with the pump structure itself. The mechanical control valve is integrated into the pump housing, and the control rod is mechanically coupled to the pump plunger. This integration eliminates the need for separate electrical control systems and reduces the overall complexity while maintaining high reliability. The control mechanism becomes an inherent part of the pump assembly rather than an add-on system.
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 continuous and precise extraction of a specified amount of formation fluid by automatically controlling the motor's forward and backward rotations, ensuring accurate sample collection and reducing maintenance costs through improved system reliability.
Implementation Method 1
a lead screw connected with the drive shaft at the end of the motor and a piston sleeved on the lead screw
Data Source
AI summary
An integrated apparatus for precisely and synchronously controlling amounts of discharged hydraulic oil and fluid using a motor, includes a housing. A movable dual-piston extractor, a motor and a plunger pump are configured in the housing and sequentially connected. A hydraulic pipeline and a fluid pipeline are connected with the housing to control flows of hydraulic oil and a fluid. A specified amount of fluid sample can be precisely extracted by precisely controlling, according to a control circuit, the number of rotations of the motor, which is indirectly reflected to a travel distance of the lead screw. A motor indirectly drives a lead screw, a nut and a piston to move linearly along a hydraulic chamber through mechanisms including a transmission shaft, and according to a position where the transmission shaft of the motor rotates, the displacement distance of the piston can be measured precisely.