Automatic pressure testing machine suitable for drilling fluid elastic plugging material

Abstract

The invention belongs to the technical field of material testing, and particularly discloses an automatic pressure testing machine suitable for a drilling fluid elastic plugging material. The system comprises a hydraulic machine, a 0MPa pressure sensing controller, an adjustable pressure sensing controller, a control display station, a pressurizing pump, a pressure relief pump, a pressurizing single-flow electromagnetic valve, a pressure relief single-flow electromagnetic valve and a hydraulic oil tank, the 0MPa pressure sensing controller and the adjustable pressure sensing controller are positioned on a pressurizing rod of the hydraulic machine; a pressurization pipeline and a pressure relief pipeline are arranged between the hydraulic machine and the hydraulic oil tank; and the control display station is provided with switches for respectively controlling the pressurization pipeline and the adjustable pressure sensing controller to start and controlling the pressure relief pipeline and the 0MPa pressure sensing controller to start. According to the invention, automatic timing pressurization and measurement of the automatic springback height of the drilling fluid elastic plugging material can be realized, time and labor are saved, the experimental result deviation is reduced, and the experimental accuracy is improved. The method can be widely applied to the elasticity test of the drilling fluid elastic plugging material.

Description

Technical Field

[0001] This invention belongs to the field of materials testing technology, and specifically relates to an automatic pressure testing machine suitable for drilling fluid elastic plugging materials. Background Technology

[0002] Drilling fluid elastic plugging material refers to a material that, during the drilling process, can fill the gaps or pores in the wellbore through elastic deformation and return to its original shape under external force. This material has a high elastic modulus and good resilience, enabling it to maintain a good sealing effect after plugging, preventing drilling fluid loss, and thus protecting the stability of the wellbore and the bottom layer.

[0003] To ensure that the elastic properties of drilling fluid elastic plugging materials meet standards, a pressure testing machine is required to measure their elasticity. Furthermore, material testing necessitates prolonged exposure to a constant pressure for both compression and rebound tests. Existing automatic pressure testing machines primarily measure the compressive and tensile strength of inelastic materials, such as cement or rock core pressure; there are no automatic pressure testing machines specifically designed for testing the compression and rebound of elastic materials. Current manually operated rebound-type pressure testing machines require manual pressurization, consuming significant physical strength, and involve long and uneven pressurization times. Additionally, measuring sample height requires simultaneous timing and measurement, which can lead to missed measurement times and inaccurate results. Therefore, there is an urgent need for an automatic pressure testing machine specifically designed for drilling fluid elastic plugging materials. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic pressure testing machine suitable for drilling fluid elastic plugging materials, which can automatically test the automatic rebound height of elastic plugging materials, and realize automated timed pressurization and measurement, reducing manual operation, saving time and effort, reducing experimental result deviation, and improving experimental accuracy.

[0005] To achieve the above objectives, the technical solution adopted by this invention is as follows: An automatic pressure testing machine for drilling fluid elastic plugging materials includes a hydraulic press, a 0MPa pressure sensor controller, an adjustable pressure sensor controller, a control display panel, a pressurizing pump, a pressure relief pump, a pressurizing single-flow solenoid valve, a pressure relief single-flow solenoid valve, and a hydraulic oil tank. The 0MPa pressure sensor controller and the adjustable pressure sensor controller are located on the pressure rod of the hydraulic press; The hydraulic press is connected to the hydraulic oil tank by a pressurizing pipeline consisting of a pressurizing single-flow solenoid valve and a pressurizing pump, and a pressure relief pipeline consisting of a pressure relief single-flow solenoid valve and a pressure relief pump. The control panel is equipped with a pressure switch that controls the pressurization line and the adjustable pressure sensor controller, and a pressure relief switch that controls the pressure relief line and the 0MPa pressure sensor controller.

[0006] As a limitation, the hydraulic press also includes an outer cylinder for placing elastic material and an inner rod for the die piston that matches the inner diameter of the outer cylinder. The inner rod of the die-casting piston is located below the pressure rod that moves up and down in the hydraulic press, and the outer cylinder of the die-casting piston is located below the inner rod of the die-casting piston.

[0007] As a further limitation, the outer cylinder of the molding piston is also provided with laser rangefinders on both sides for measuring the height of the inner rod of the molding piston. The laser rangefinders are connected to the control display console through an optical-to-digital converter.

[0008] As a further limitation, a timer for controlling the start of the laser rangefinder is provided between the 0MPa pressure sensor controller and the laser rangefinder, as well as between the adjustable pressure sensor controller and the laser rangefinder. The timer controls the laser rangefinder to start after the timer expires.

[0009] The present invention, by adopting the above-described technical solution, achieves the following technical advancements compared to existing technologies: (1) The present invention can automatically test the automatic rebound height of drilling fluid elastic plugging material, and can realize automated timing pressurization and measurement, saving time and effort, reducing experimental result deviation, and improving experimental accuracy; (2) In view of the characteristics of drilling fluid elastic sealing material, the present invention provides an outer cylinder of the molding die piston and an inner rod of the molding die piston, which can ensure the consistency of pressure when the material is pressurized; (3) The present invention is equipped with a laser rangefinder that can measure data at the moment of startup and transmit the data back to the control display, thereby improving the accuracy of the test experiment; (4) The present invention sets timers between the 0MPa pressure sensor controller and the laser rangefinder and between the adjustable pressure sensor controller and the laser rangefinder, respectively. Timers can be set at the first time the pressure reaches the standard, and the height data of the material can be measured at the first time after the timer is reached, which greatly improves the accuracy of the measurement experiment.

[0010] This invention belongs to the field of materials testing technology. It can realize automated timing, pressurization and measurement, and realize the automatic measurement of the rebound height of drilling fluid elastic plugging material, which saves time and effort, reduces experimental result deviation, and improves experimental accuracy. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0012] In the attached diagram: Figure 1 This is a simplified structural diagram of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the circuit connection relationship of the components in Embodiment 1 of the present invention.

[0013] In the diagram, 1. Laser rangefinder; 2. Outer cylinder of the molding piston; 3. Inner rod of the molding piston; 4. Hydraulic press; 5. 0MPa pressure sensor controller; 6. Adjustable pressure sensor controller; 7. Pressurizing pump; 8. Relief pump; 9. Pressurizing single-flow solenoid valve; 10. Relief single-flow solenoid valve; 11. Hydraulic oil tank; 12. Control display panel; 13. Timer; 14. Optical-to-digital converter. Detailed Implementation

[0014] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0015] Example 1: An automatic pressure testing machine suitable for drilling fluid elastic plugging materials like Figure 1 As shown, this embodiment includes a hydraulic press 4, a 0MPa pressure sensor controller 5, an adjustable pressure sensor controller 6, a control display panel 12, a pressurizing pump 7, a pressure relief pump 8, a pressurizing single-flow solenoid valve 9, a pressure relief single-flow solenoid valve 10, a hydraulic oil tank 11, a die piston outer cylinder 2, a die piston inner rod 3, a laser rangefinder 1, a photo-to-digital converter 14, and two timers 13.

[0016] The 0MPa pressure sensor controller 5 and the adjustable pressure sensor controller 6 are located on the pressure rod of the hydraulic press 4. The inner rod 3 of the molding die piston is located below the vertically moving pressure rod of the hydraulic press 4, and the outer cylinder 2 of the molding die piston is located below the inner rod 3. The outer cylinder 2 of the molding die piston is used to hold the elastic material, and the diameter of the inner rod 3 of the molding die piston matches the inner diameter of the outer cylinder 2. This matching means that the inner rod 3 of the molding die piston can just enter the outer cylinder 2 of the molding die piston to pressurize the elastic material without the elastic material overflowing. Laser rangefinders 1 are also provided on both sides of the outer cylinder 2 of the molding die piston for measuring the height of the inner rod 3 of the molding die piston.

[0017] A pressurizing pipeline consisting of a pressurizing single-flow solenoid valve 9 and a pressurizing pump 7, and a depressurizing single-flow solenoid valve 10 and a depressurizing pump 8, are provided between the hydraulic press 4 and the hydraulic oil tank 11. The pressurizing pipeline is used to deliver hydraulic oil to the hydraulic press 4, providing power to the hydraulic press 4; the depressurizing pipeline is used to allow hydraulic oil to flow back to the hydraulic oil tank 11 when the hydraulic press 4 is depressurized. The pressurizing single-flow solenoid valve 9 and the depressurizing single-flow solenoid valve 10 ensure the single flow of oil in the circuit.

[0018] Specific component circuit connections, such as Figure 2 As shown, the control display console 12 controls the start-up of the pressurization pipeline and the adjustable pressure sensor controller 6 via a pressurization switch, and controls the start-up of the pressure relief pipeline and the 0MPa pressure sensor controller 5 via a pressure relief switch. A timer 13 for controlling the start-up of the laser rangefinder 1 is installed between the 0MPa pressure sensor controller 5 and the laser rangefinder 1, and between the adjustable pressure sensor controller 6 and the laser rangefinder 1. The laser rangefinder 1 is connected to the control display console 12 via an optical-to-digital converter 14.

[0019] This embodiment involves two experimental steps: pressurization and rebound. During the pressurization test, a suitable amount of test sample is weighed, placed inside the outer cylinder 2 of the pressure mold piston, and smoothed. Then, the control pressure of the adjustable pressure sensor controller 6 is set to the required test pressure. The timer 13 connected to the adjustable pressure sensor controller 6 is adjusted to 1 minute, and the timer 13 connected to the 0MPa pressure sensor controller 5 is adjusted to 2 minutes. The pressurization switch is closed, and the pressurization pump 7 is started. At this time, the pressurization single-flow solenoid valve 9 is energized and in the open state; the depressurization single-flow solenoid valve 10 is not energized and in the closed state. The pressure pump 7 operates, delivering hydraulic oil through the pressure single-flow solenoid valve 9 to the hydraulic press 4 for pressurization. The pressure rod of the hydraulic press 4 moves downward, driving the inner rod 3 of the die piston downward into the outer cylinder 2 of the die piston and applying pressure. This causes the inner rod 3 and the outer cylinder 2 of the die piston to compress the sample, forming a module. As the pressure rod of the hydraulic press 4 moves downward, the pressure measured by the adjustable pressure sensor controller 6 increases. When the pressure reaches the required test pressure, the timer 13 activated by the adjustable pressure sensor controller 6 starts a 1-minute timer, and simultaneously disconnects the circuit of the pressure pump 7. At this time, the pressure pump 7 stops working, the solenoid valve closes, and the pressure of the hydraulic press 4 remains constant. After 1 minute, the timer 13 activated by the adjustable pressure sensor controller 6 controls the laser rangefinder 1 to start. The measured optical data is transmitted from the laser rangefinder 1 to the optical-to-digital converter 14, which converts it into a digital signal. The optical-to-digital converter 14 then transmits the digital signal to the control display console 12 to form experimental data. The experimenter records the height at this time as h1, and the pressurization experiment ends.

[0020] After the pressurization experiment, disconnect the pressurization switch; close the pressure relief switch and start the rebound experiment. At this time, the pressurization single-flow solenoid valve 9 is not energized and is in the closed state; the pressure relief single-flow solenoid valve 10 is open, the pressure relief oil circuit is unobstructed, the pressure relief pump 8 starts to operate, the pressure in the oil circuit decreases, the pressure rod of the hydraulic press 4 begins to move upward, and the pressure of the inner rod 3 of the pressure mold piston on the test material decreases. When the pressure drops to 0MPa, the timer 13 connected to the 0MPa pressure sensor controller 5 starts timing for 2 minutes. After 2 minutes, the timer 13 connected to the 0MPa pressure sensor controller 5 controls the laser rangefinder 1 to start. The laser rangefinder 1 measures the height of the inner rod 3 of the pressure mold piston. The measured optical data is transmitted by the laser rangefinder 1 to the optical-to-digital converter 14 to be converted into a digital signal. The optical-to-digital converter 14 then transmits the digital signal to the control display console 12 to form experimental data, namely the rebound height data, which is recorded again by the experimenter at this time as h2. The pressure relief single-flow solenoid valve 10 remains connected, and the pressure relief pump 8 continues to operate until the oil in the pressure relief tank has completely flowed back. Once the pressure relief switch is disconnected, the test sample compaction module inside the outer cylinder 2 of the pressure mold piston can be cleaned.

[0021] Dividing the recorded experimental data h2 and h1 yields the value of the rebound rate S.

[0022] It should be noted that in this implementation, the timer 13 connected to the 0MPa pressure sensor controller 5 is set to 2 minutes, and the timer 13 connected to the adjustable pressure sensor controller 6 is set to 1 minute. The timing duration can be adjusted according to the actual situation, as long as the experimental requirements are met.

[0023] In summary, this embodiment can achieve automated timing, pressurization, and measurement according to the settings, and realize the automatic measurement of the rebound height of the drilling fluid elastic plugging material, saving time and effort, reducing experimental result deviations, and improving experimental accuracy.

Claims

1. An automatic pressure testing machine suitable for drilling fluid elastic plugging materials, characterized in that, Includes a hydraulic press, a 0MPa pressure sensor controller, an adjustable pressure sensor controller, a control display panel, a pressurizing pump, a pressure relief pump, a pressurizing single-flow solenoid valve, a pressure relief single-flow solenoid valve, and a hydraulic oil tank. The 0MPa pressure sensor controller and the adjustable pressure sensor controller are located on the pressure rod of the hydraulic press; The hydraulic press is connected to the hydraulic oil tank by a pressurizing pipeline consisting of a pressurizing single-flow solenoid valve and a pressurizing pump, and a pressure relief pipeline consisting of a pressure relief single-flow solenoid valve and a pressure relief pump. The control panel is equipped with a pressure switch that controls the pressurization line and the adjustable pressure sensor controller, and a pressure relief switch that controls the pressure relief line and the 0MPa pressure sensor controller.

2. The automatic pressure testing machine for drilling fluid elastic plugging materials according to claim 1, characterized in that, The hydraulic press also includes an outer cylinder for placing elastic material and an inner rod for the die piston that matches the inner diameter of the outer cylinder. The inner rod of the die-casting piston is located below the pressure rod that moves up and down in the hydraulic press, and the outer cylinder of the die-casting piston is located below the inner rod of the die-casting piston.

3. An automatic pressure testing machine for drilling fluid elastic plugging materials according to claim 2, characterized in that, The outer cylinder of the molding die piston is also equipped with laser rangefinders on both sides for measuring the height of the inner rod of the molding die piston. The laser rangefinders are connected to the control display console through an optical-to-digital converter.

4. An automatic pressure testing machine for drilling fluid elastic plugging materials according to claim 3, characterized in that, A timer for controlling the start of the laser rangefinder is provided between the 0MPa pressure sensor controller and the laser rangefinder, as well as between the adjustable pressure sensor controller and the laser rangefinder. The timer controls the laser rangefinder to start after the timer expires.

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