A platform testing device and method for ball valve type pressure-holding coring drill bits

Abstract

This invention discloses a platform testing device and method for ball valve-type pressure-holding coring drill bits, relating to the field of oil and gas drilling coring technology. It employs an integrated grouting and sand-injection platform, utilizing the high-pressure jetting action of a sand mixer to directly inject grout into the high-pressure pipeline. A one-way valve effectively prevents mud from flowing back into the sand mixer from the high-pressure pipeline. The mixing ratio can be changed at any time during injection, achieving continuous testing. Real-time data acquisition, through pressure and flow sensors recording data before and after sand injection, and comparing this data with pressure gauge and electromagnetic flowmeter data during mud injection, allows analysis of the reliability of ball valve reversal under different sand contents. It can also test the resistance and flow loss during system circulation, and analysis reveals the ball valve's operating limits. The test observation window is open and transparent, allowing for direct observation of the ball valve's reversal state under different sand contents. The operation steps are simple.

Description

Technical Field

[0001] This invention relates to the field of core drilling technology in oil and gas, and in particular to a platform testing device and method suitable for ball valve type pressure-holding core drilling tools. Background Technology

[0002] Currently, the most common method for testing pressure-holding coring tools is to use well core drilling. This involves conducting core drilling operations in the field. On the one hand, this method is very labor-intensive, as the entire coring process is carried out underground, and the ball valve's flipping status cannot be effectively observed in real time during the testing process. On the other hand, for ball valve-type pressure-holding coring tools, field drilling tests cannot test the effectiveness of the ball valve's flipping under multi-proportion sand mixing conditions. The sand content of the formation in the same area remains basically constant. If different proportions of sand content need to be tested, the well location needs to be moved. This requires drilling several wells in different areas, which is cumbersome and extremely costly. Summary of the Invention

[0003] To address the above technical problems, this invention provides a platform testing device and method suitable for ball valve type pressure-holding coring drill bits, which can conveniently and quickly perform ball valve overturning platform testing under various sand content conditions.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] This invention provides a platform testing device and method suitable for ball valve type pressure-holding coring drill bits, including a mud tank, a mud pump, a high-pressure pipeline, a sand mixer, a derrick, a swivel, a power head, a simulated wellbore, a return slurry trough, and a mud sedimentation tank; the inlet of the mud pump is connected to the mud tank; the swivel and the power head are both located on the upper part of the derrick, and the bottom of the swivel is connected to the top of the power head; the outlet of the mud pump is connected to the inlet of the swivel through the high-pressure pipeline, and the bottom of the power head is connected to the pressure-holding coring drill bit through a drill pipe; the outlet of the sand mixer is connected to the high-pressure pipeline; the simulated wellbore is located on the lower part of the derrick, and the wellhead of the simulated wellbore is connected to the mud sedimentation tank through the return slurry trough.

[0006] Optionally, the simulated wellbore is an plexiglass tube.

[0007] Optionally, the simulated wellbore is equipped with pressure and flow sensors, which are connected to the data logger.

[0008] Optionally, a check valve is provided between the outlet of the sand mixer and the high-pressure pipeline.

[0009] Optionally, an electromagnetic flow meter is installed on the high-pressure pipeline.

[0010] Optionally, the mud pump is equipped with a pressure gauge.

[0011] The present invention also discloses a method for a platform testing device based on the above-mentioned ball valve type pressure-holding coring drill bit, wherein a certain proportion of slurry is pre-mixed and added to the sand mixer, pressure and flow sensors are connected to the simulated wellbore, and connected to the data logger via signal lines;

[0012] During the system operation, the mud pump is turned on, and after mud is seen spraying out from below the drill string through the simulated wellbore, the sand mixer is turned on to continuously inject sand into the high-pressure pipeline.

[0013] During the injection process, ground personnel record the changes in pressure gauges and electromagnetic flow meters in real time. At the same time, staff on the platform use data loggers to read the readings of pressure and flow sensors connected to the simulated wellbore, and monitor and record the pressure and flow of the returned mud in real time.

[0014] After injecting for a certain period of time, observe the sand content in the mud returned from the return slurry tank, then turn off the mud pump and sand mixer, unlock the drill string assembly, lower the retrieval spearhead, and lift the pressure-maintaining coring drill string to perform a flip-off closing operation on the ball valve; observe the state of the ball valve on the pressure-maintaining coring drill string after flipping it through the simulated wellbore to see if it can be completely closed;

[0015] By changing the sand mixing ratio and repeating the above operation, the ball valve flipping behavior of the ball valve type pressure-holding coring drill bit under different sand content conditions was obtained, providing guidance for the subsequent application of the drill bit in engineering practice.

[0016] Optionally, on the ground, after the staff assembles the pressure-holding coring tool, they manually test the ball valve of the pressure-holding coring tool in a mud-free state. If the ball valve operates normally and remains fully open, the assembled drill string is lowered into the simulated wellbore.

[0017] The present invention achieves the following technical effects compared to the prior art:

[0018] (1) The testing method in this invention uses an integrated grouting and sand injection platform. The high-pressure jetting action of the sand mixer directly injects mortar into the high-pressure pipeline. A one-way valve is installed at the injection tee position to effectively prevent the mud in the high-pressure pipeline from flowing back into the sand mixer. At the same time, due to the function of the one-way valve, the mixing ratio can be changed at any time during the injection process, thereby achieving the effect of continuous testing.

[0019] (2) The test method in this invention adopts real-time data acquisition. The data is recorded by pressure and flow sensors to compare the changes before and after sand injection, as well as the data of pressure gauge and electromagnetic flow meter during mud injection. On the one hand, the reliability of ball valve flipping under different sand content conditions can be analyzed; on the other hand, the resistance and flow loss in the system circulation process can be tested. Through analysis, the limit state of ball valve operation can be obtained.

[0020] (3) The test observation window in this invention is open and transparent. Through the plexiglass, the flipping state of the ball valve under different sand content conditions can be observed more intuitively, and the operation steps are simple. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the platform testing device of the present invention applicable to ball valve type pressure-holding coring drill.

[0023] Explanation of reference numerals in the attached diagram: 1. Mud pit; 2. Mud pump; 3. Pressure gauge; 4. High-pressure pipeline; 5. Electromagnetic flow meter; 6. Sand mixer; 7. Check valve; 8. Water tap; 9. Power head; 10. Pressure-holding coring tool; 11. Acrylic glass tube; 12. Pressure and flow sensor; 13. Data logger; 14. Mud sedimentation tank; 15. Return slurry trough. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1:

[0026] like Figure 1As shown, this embodiment provides a platform testing device suitable for ball valve type pressure-holding coring drill bits, including a mud tank 1, a mud pump 2, a high-pressure pipeline 4, a sand mixer 6, a derrick, a swivel 8, a power head 9, a simulated wellbore, a return slurry channel 15, and a mud sedimentation tank 14; the inlet of the mud pump 2 is connected to the mud tank 1; the swivel 8 and the power head 9 are both located on the upper part of the derrick, and the bottom of the swivel 8 is connected to the top of the power head 9; the outlet of the mud pump 2 is connected to the inlet of the swivel 8 through the high-pressure pipeline 4, and the bottom of the power head 9 is connected to the pressure-holding coring drill bit 10 through the drill pipe; the outlet of the sand mixer 6 is connected to the high-pressure pipeline 4; the simulated wellbore is located on the lower part of the derrick, and the wellhead of the simulated wellbore is connected to the mud sedimentation tank 14 through the return slurry channel 15.

[0027] In this specific embodiment, for easier and more intuitive observation, the simulated well shaft is made of transparent material. In this specific embodiment, the simulated well shaft is an plexiglass cylinder 11.

[0028] Pressure and flow sensors 12 are installed on the simulated wellbore, and these sensors 12 are connected to a data logger 13. The pressure and flow sensors 12 are used for real-time data acquisition. More specifically, the pressure and flow sensors 12 can be either a pressure and flow sensor capable of detecting both pressure and flow simultaneously, or a pressure sensor and a flow sensor can be used to detect pressure and flow separately.

[0029] A one-way valve 7 is installed between the outlet of the sand mixer 6 and the high-pressure pipeline 4. The mixing ratio can be changed at any time during the injection process, thereby achieving the effect of continuous testing.

[0030] An electromagnetic flow meter 5 is installed on the high-pressure pipeline 4. A pressure gauge 3 is installed on the mud pump 2. By comparing the changes in data before and after sand injection recorded by the pressure and flow sensors 12, as well as the data from the pressure gauge 3 and electromagnetic flow meter 5 during mud injection, the reliability of the ball valve's overturning under different sand contents can be analyzed. On the other hand, the resistance and flow loss during the system circulation process can be tested, and the ultimate state of the ball valve under operation can be obtained through analysis.

[0031] Example 2:

[0032] This embodiment provides a method for a platform testing device based on the ball valve type pressure-holding coring drill bit in Embodiment 1. The mud in the mud tank 1 is pumped into the high-pressure pipeline 4 by the mud pump 2. At the same time, the sand mixer 6 directly injects the sand in a pre-set ratio into the high-pressure pipeline 4 containing mud. The mixed mud then flows down the high-pressure pipeline 4 through the swivel 8 and the power head 9, enters the annulus of the pressure-holding coring drill bit 10, exits the drill bit through the ball valve and drill bit, and enters the simulated wellbore. Under pressure, it flows back up along the inner wall of the simulated wellbore and enters the mud sedimentation tank 14 through the return mud tank 15. The mud mixed with sand is recycled after sedimentation in the sedimentation tank.

[0033] The method in this embodiment is as follows:

[0034] Pre-mixed mortar of a certain proportion is added to the sand mixer 6. The pressure and flow sensor 12 is connected to the simulated wellbore and connected to the data logger 13 via a signal line.

[0035] During the system operation, turn on the mud pump 2, and after seeing mud spraying out from below the drill string through the simulated wellbore, turn on the sand mixer 6 to continuously inject sand into the high-pressure pipeline 4.

[0036] During the injection process, ground personnel record the changes of pressure gauge 3 and electromagnetic flow meter 5 in real time. At the same time, the staff on the platform use data logger 13 to read the readings of pressure and flow sensor 12 connected to the simulated wellbore, and monitor and record the pressure and flow of the returned mud in real time.

[0037] After injecting for a certain period of time, observe the sand content in the mud returned from the return slurry 15, then turn off the mud pump 2 and the sand mixer 6, unlock the drill string assembly, lower the retrieval spearhead, and lift the pressure-maintaining coring drill string 10 to perform a flip-off closing operation on the ball valve; observe the state of the ball valve on the pressure-maintaining coring drill string 10 after flipping it through the simulated wellbore to see if it can be completely closed;

[0038] By changing the sand mixing ratio and repeating the above operation, the ball valve flipping behavior of the ball valve type pressure-maintaining coring drill bit 10 under different sand content conditions was obtained, providing guidance for the subsequent application of the drill bit in engineering practice.

[0039] Optionally, on the ground, after the staff assembles the pressure-holding coring tool 10, they manually operate the ball valve of the pressure-holding coring tool 10 to perform a flip test in the absence of mud. If the ball valve flips normally and remains fully open, the assembled drill tool assembly is lowered into the simulated wellbore.

[0040] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for testing a platform for a ball valve-type pressure-holding coring drill bit, the platform testing device comprising a mud tank, a mud pump, a high-pressure pipeline, a sand mixer, a derrick, a swivel, a power head, a simulated wellbore, a return slurry trough, and a mud sedimentation tank; the inlet of the mud pump is connected to the mud tank; the swivel and the power head are both located on the upper part of the derrick, and the bottom of the swivel is connected to the top of the power head; the outlet of the mud pump is connected to the inlet of the swivel via the high-pressure pipeline, and the bottom of the power head is connected to the pressure-holding coring drill bit via a drill pipe; the outlet of the sand mixer is connected to the high-pressure pipeline; the simulated wellbore is located on the lower part of the derrick, and the wellhead of the simulated wellbore is connected to the mud sedimentation tank via the return slurry trough, characterized in that... Pre-mixed mortar of a certain proportion is added to the sand mixer. The pressure and flow sensors are connected to the simulated wellbore and then connected to the data logger via signal lines. During the system operation, the mud pump is turned on, and after mud is seen spraying out from below the drill string through the simulated wellbore, the sand mixer is turned on to continuously inject sand into the high-pressure pipeline. During the injection process, ground personnel record the changes in pressure gauges and electromagnetic flow meters in real time. At the same time, staff on the platform use data loggers to read the readings of pressure and flow sensors connected to the simulated wellbore, and monitor and record the pressure and flow of the returned mud in real time. After injecting for a certain period of time, observe the sand content in the mud returned from the return slurry tank, then turn off the mud pump and sand mixer, unlock the drill string assembly, lower the retrieval spearhead, and lift the pressure-maintaining coring drill string to perform a flip-off closing operation on the ball valve; observe the state of the ball valve on the pressure-maintaining coring drill string after flipping it through the simulated wellbore to see if it can be completely closed; By changing the sand mixing ratio and repeating the above operation, the ball valve flipping behavior of the ball valve type pressure-holding coring drill bit under different sand content conditions was obtained, providing guidance for the subsequent application of the drill bit in engineering practice.

2. The method for testing a platform using a ball valve-type pressure-holding coring drill bit according to claim 1, characterized in that, The simulated wellbore is made of plexiglass.

3. The method for testing a platform using a ball valve-type pressure-holding coring drill bit according to claim 1, characterized in that, The simulated wellbore is equipped with pressure and flow sensors, which are connected to the data logger.

4. The method for testing a platform using a ball valve-type pressure-holding coring drill bit according to claim 1, characterized in that, A one-way valve is installed between the outlet of the sand mixer and the high-pressure pipeline.

5. The method for testing a platform using a ball valve-type pressure-holding coring drill bit according to claim 1, characterized in that, An electromagnetic flow meter is installed on the high-pressure pipeline.

6. The method for testing a platform using a ball valve-type pressure-holding coring drill bit according to claim 1, characterized in that, The mud pump is equipped with a pressure gauge.

7. The method for testing a platform using a ball valve-type pressure-holding coring drill bit according to claim 1, characterized in that, On the ground, after assembling the pressure-holding coring tool, the staff manually operated the ball valve of the pressure-holding coring tool to perform a flip test in the absence of mud. The ball valve flipped normally and was kept fully open. The assembled drill tool assembly was then lowered into the simulated wellbore.

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