An improved borehole water pressure testing device

Abstract

The invention discloses an improved drilling water pressure test equipment, comprising a first water pump, an electromagnetic flowmeter, a second water pump, a water pump pressure regulator, a drilling water pressure data processing terminal, a first water storage tank, a side pressure controller, a water stop plug, a water pressure sensor, a drill bit and a drilling cleaning device, a first water valve, a second water valve, a third water valve, a fourth water valve, a second water storage tank, and a hydraulic press; the electromagnetic flowmeter is arranged on a pipeline connecting the water pump and the drilling cleaning device, the water pressure sensor and the electromagnetic flowmeter are connected to the drilling water pressure data processing terminal through a circuit, the first water pump and the second water pump are respectively connected to the second water storage tank and the two sides of the first water storage tank, one end of the water pump pressure regulator is connected to the drilling water pressure data processing terminal through a circuit, the other end of the water pump pressure regulator is connected to the second water pump, the first water pump is connected to the drilling cleaning device through a first water pipe, and the second water pump is connected to the drilling cleaning device through a second water pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of borehole water pressure testing, in particular to an improved borehole water pressure testing device. Background Art

[0002] The water pressure test is an in-situ test that presses water (generally within 1MPa) into the borehole and calculates the development of rock mass cracks and water permeability based on the water absorption of the rock mass (generally within 100L / min). The water pressure test uses special water-stopping equipment to isolate a certain length of the borehole test section, and then presses water into this section of the borehole with a fixed water pressure. The water penetrates into the rock mass through the cracks around the hole wall, and the amount of water that eventually penetrates will tend to a stable value. The strength of the rock mass permeability can be determined based on the water pressure, the length of the test section, and the amount of water that has been stably infiltrated.

[0003] In the prior art, the drilling, cleaning and water pressure test steps of the borehole water pressure test are all operated by their own equipment, which lacks synchronization of operation and increases the workload, especially in the rocky areas of northwest China where it is inconvenient to move the equipment. In addition, most of the existing water stop plugs are fixed to the drill rod, and their positions are basically unable to move during the work in the test section area. In the face of complex underground rock formations, if you want to move the position of the test section, you need to move the entire drill rod, which greatly reduces the automation of the equipment and makes the water stop plug more prone to damage.

[0004] In the existing water pressure test process, manual ball valves are generally used to adjust the pressure. Operators need to check the flow meter and pressure gauge on site and then process the data. The manual process is not very timely and is prone to errors. The pipeline will cause loss to the pressure gauge reading and generate errors. Summary of the invention

[0005] The purpose of the present invention is to provide an improved drilling water pressure test equipment, so that the drilling device and the cleaning device are integrated into an integrated device; and the water-stop device can achieve rapid adjustment of the position in the underground test section, realize automatic multiple measurements, and reduce errors.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] An improved drilling water pressure test device, comprising a first water pump, an electromagnetic flow meter, a second water pump, a water pump pressure regulator, a drilling water pressure data processing terminal, a first water storage tank, a side pressure controller, a water stop plug, a water pressure sensor, a drill bit and a drilling cleaning device, a first water valve, a second water valve, a third water valve, a fourth water valve, a second water storage tank, and a hydraulic press;

[0008] The electromagnetic flowmeter is arranged on the pipeline connecting the water pump and the borehole cleaning equipment, the water pressure sensor and the electromagnetic flowmeter are connected to the borehole water pressure data processing terminal through the circuit, the first water pump and the second water pump are connected to the second water storage tank and the two sides of the first water storage tank respectively, one end of the water pump pressure regulator is connected to the borehole water pressure data processing terminal through the circuit, and the other end of the water pump pressure regulator is connected to the second water pump, the first water pump is connected to the borehole cleaning equipment through the first water pipe, the second water pump is connected to the borehole cleaning equipment through the second water pipe, and the first water pump and the second water pump are connected through the third water pipe. The first water valve is arranged on the first water pipe, the second water valve and the third water valve are arranged on the third water pipe, and the fourth water valve is arranged on the second water pipe. The first water pump and the second water pump can inject water and pump water into the borehole cleaning equipment through the first water pipe and the second water pipe to realize the cleaning and water pressure test of the borehole.

[0009] The hydraulic press support points are arranged on the ground on both sides of the borehole to bear pressure on the borehole part and the side pressure controller. The side pressure controller and the water stop plug are arranged on the outside of the borehole cleaning equipment. The side pressure controller is arranged near the upper end of the water stop plug, and the drill bit is connected to the end of the drill rod.

[0010] Furthermore, the side pressure controller and the water stop plug can move up and down outside the drilling cleaning equipment.

[0011] Furthermore, it also includes a first bracket, a second bracket, a pulley, a motor, and a belt. The side pressure controller is installed on the first bracket, the water stop plug is installed on the second bracket, the first bracket and the second bracket are installed on the belt, and the motor can drive the pulley to drive the belt to rotate.

[0012] Furthermore, the motor is a servo motor.

[0013] Compared with the prior art, the present invention has the following significant advantages:

[0014] (1) The integrated design of drilling and flushing makes the equipment more convenient to operate; (2) The water stop plug is made removable, which is conducive to the operability and accuracy of the test; (3) The upper end of the water stop plug is treated with side pressure, which increases the reliability of the test and helps to extend the service life of the water stop plug; (4) The terminal can be used to monitor and adjust the water pressure in real time, and record and report it, which greatly improves the accuracy and reliability of the test; (5) The degree of intelligence is improved, reducing human errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the overall structure of the improved drilling water pressure test equipment.

[0016] Figure 2 for Figure 1 Cross-section view at AA in the middle. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] Combination Figure 1 , an improved borehole water pressure test equipment, which can perform a borehole water pressure test on a rock formation area, pressurize water (generally within 1MPa) into the borehole, and calculate the development of rock mass fissures and water permeability according to the rock mass water absorption (generally within 100L / min). The equipment includes a first water pump 1, an electromagnetic flowmeter 2, a second water pump 3, a water pump pressure regulator 4, a borehole water pressure data processing terminal 5, a first water storage tank 6, a side pressure controller 7, a water stop plug 8, a water pressure sensor 9, a drill bit 10 and a borehole cleaning device 11, a first water valve 12, a second water valve 13, a third water valve 14, a fourth water valve 15, a second water storage tank 16, and a hydraulic press 17;

[0019] The electromagnetic flowmeter 2 is arranged on the pipeline connecting the water pump 3 and the borehole cleaning equipment 11, the water pressure sensor 9 and the electromagnetic flowmeter 2 are connected to the borehole water pressure data processing terminal 5 through the circuit, the first water pump 1 and the second water pump 3 are connected to the second water storage tank 16 and the first water storage tank 6 on both sides respectively, one end of the water pump pressure regulator 4 is connected to the borehole water pressure data processing terminal 5 through the circuit, and the other end of the water pump pressure regulator 4 is connected to the second water pump 3, the first water pump 1 is connected to the borehole cleaning equipment 11 through the first water pipe, the second water pump 3 is connected to the borehole cleaning equipment 11 through the second water pipe, and the first water pump 1 and the second water pump 3 are connected through the third water pipe. The first water valve 12 is arranged on the first water pipe, the second water valve 13 and the third water valve 14 are arranged on the third water pipe, and the fourth water valve 15 is arranged on the second water pipe. The first water pump 1 and the second water pump 3 can inject water and pump water into the borehole cleaning equipment 11 through the first water pipe and the second water pipe to realize the cleaning and water pressure test of the borehole.

[0020] The support points of the hydraulic press 17 are set on the ground on both sides of the borehole to bear pressure on the borehole part and the side pressure controller 7. The side pressure controller 7 and the water-stop plug 8 are set on the outside of the drilling cleaning equipment 11. The side pressure controller 7 is set near the upper end of the water-stop plug 8, and the drill bit 10 is connected to the end of the drill rod.

[0021] The drilling water pressure data processing terminal 5 adopts a PC to collect the instantaneous pressure value transmitted by the water pressure sensor and the flow value of the electromagnetic flowmeter, and perform data analysis, thereby reducing human errors and greatly improving the efficiency of the test work.

[0022] The water pump pressure regulator 4 receives instructions from the borehole water pressure data processing terminal 5 to adjust the water pump output pressure.

[0023] The drilling cleaning equipment 11 and the drilling equipment are designed to be integrated. The water pump 1 and the water pump 3 are respectively connected to the second water tank 16 and the first water tank 6. The integrated operation of water inlet and outlet during drilling, cleaning and testing is realized through the control of water valves 12, 13, 14 and 15. Water can flow from the water pipe through the drilling cleaning equipment 11 into the borehole, clean the borehole, clean the soil, dust, rock debris, etc. therein, and flow out from the water pipe on the other side.

[0024] Furthermore, the side pressure controller 7 and the water stop plug 8 can move up and down outside the drilling cleaning device 11 .

[0025] Furthermore, it also includes a first bracket 22, a second bracket 18, a pulley 19, a motor 20, and a belt 21. The side pressure controller 7 is installed on the first bracket 22, and the water stop plug 8 is installed on the second bracket 18. The first bracket 22 and the second bracket 18 are installed on the belt 21. The motor can drive the pulley 19 to drive the belt 21 to rotate. The water stop plug 8 adopts terminal intelligent control. Without moving the drill rod, it can be moved to perform the water stopping function at different distances in the test section, real-time adjustment, and multiple measurements, which increases the accuracy of the test results. The side pressure control equipment 7 adopts terminal intelligent control and electromagnetic slide rail control movement. It can be fixed in position after the water stop plug 8 is fixed, and bears part of the side pressure.

[0026] Furthermore, the motor 20 is a servo motor, which can achieve precise control of the rotation of the motor through closed-loop pulse positioning, thereby achieving precise positioning with an accuracy of up to 0.001 mm.

[0027] The improvement of the present invention enables the drilling device and the drilling cleaning device to be integrated into an integrated device; and enables the water-stop device to quickly adjust its position in the underground test section, realize automatic multiple measurements, and reduce errors; at the same time, the pressure gauge, flow meter and terminal are integrated, and the water pressure process is intelligently monitored and adjusted, thereby recording the most stable experimental data.

[0028] The test method of the integrated intelligent drilling water pressure test equipment has the following specific steps:

[0029] Step 1: Select appropriate drilling equipment, especially the drill bit 10, according to the shape, size and depth of the hole setting. After adjusting the position of the entire equipment, prepare for the drilling operation according to the test setting.

[0030] Step 2: Adjust the drilling equipment and start drilling in the rock test section. First, fill the water tank 6 with cleaning fluid. Do not stop the drilling operation. When the borehole reaches a certain depth, close the water valves 12, 13, and 14, open the water valve 15, and then control the switch of the water pump 3 to make it work. After injecting enough cleaning fluid into the borehole, open the water valve 12 and control the switch of the water pump 1 to make it work, thereby completing the cleaning work in the drilling operation.

[0031] Step 3: After drilling and cleaning, turn off pumps 1 and 3 and control the Figure 2 The servo motor drives the belt 21 to achieve precise adjustment of the position of the water stop plug 8 and the side pressure controller 7, and starts the water stop plug 8 to stop water in the drilling test section. After the water stop work is completed, the drilling equipment and the side pressure controller 7 are fixed in the vertical load direction by the hydraulic press 17.

[0032] Step 4: After the drilling and water stopping work is completed, close the water valve 12, open the water valves 13, 14, and 15, turn on the water pump 3 to start injecting water into the test section through the connected pipes and the pipes in the cleaning equipment, and start the water pressure test. The time when the index of the electromagnetic flowmeter 2 does not fluctuate significantly is taken as the test start time, and the PC terminal 5 begins to process, analyze, and record the reading of the electromagnetic flowmeter 2 and the data of the water pressure sensor 9. The PC terminal 5 issues instructions to the water pump pressure regulator 4 based on the real-time data monitoring to adjust the output pressure of the water pump 3.

[0033] Step 5. Adjust the length of the test section and conduct multiple tests on the borehole. Repeat steps 3 and 4 to obtain the pressure and flow values ​​under the conditions of different length test sections of the same borehole. According to the calculation principle q = Q / (P×L), where q is the permeability, the unit is Lu (1Lu is equal to the amount of water pressed into the test section per minute per meter at a test pressure of 1MPa); Q is the pressurized flow rate, the unit is L / min; L is the length of the test section, the unit is m; P is the pressure acting in the time period, the unit is MPa. Based on n measurements, use the formula q = (q1+q2+…+q n ) / n to obtain the average of the test results, effectively avoiding the error caused by a single test and obtaining the final rock permeability.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An improved drilling water pressure test equipment, characterized in that: It comprises a first water pump (1), an electromagnetic flow meter (2), a second water pump (3), a water pump pressure regulator (4), a borehole water pressure data processing terminal (5), a first water storage tank (6), a side pressure controller (7), a water stop plug (8), a water pressure sensor (9), a drill bit (10), a borehole cleaning device (11), a first water valve (12), a second water valve (13), a third water valve (14), a fourth water valve (15), a second water storage tank (16), and a hydraulic press (17); The electromagnetic flowmeter (2) is arranged on a pipeline connecting the water pump (3) and the borehole cleaning device (11); the water pressure sensor (9) and the electromagnetic flowmeter (2) are connected to the borehole water pressure data processing terminal (5) through a circuit; the first water pump (1) and the second water pump (3) are connected to the second water storage tank (16) and the first water storage tank (6) on both sides respectively; one end of the water pump pressure regulator (4) is connected to the borehole water pressure data processing terminal (5) through a circuit; the other end of the water pump pressure regulator (4) is connected to the second water pump (3); the first water pump (1) is connected to the borehole cleaning device (11) is connected via a first water pipe, the second water pump (3) is connected to the borehole cleaning device (11) via a second water pipe, the first water pump (1) and the second water pump (3) are connected via a third water pipe, the first water valve (12) is arranged on the first water pipe, the second water valve (13) and the third water valve (14) are arranged on the third water pipe, and the fourth water valve (15) is arranged on the second water pipe, the first water pump (1) and the second water pump (3) can inject water into and pump water from the borehole cleaning device (11) via the first water pipe and the second water pipe, thereby achieving borehole cleaning and water pressure testing, The support points of the hydraulic press (17) are arranged on the ground at both sides of the borehole to bear pressure on the borehole part and the side pressure controller (7); the side pressure controller (7) and the water stop plug (8) are arranged outside the borehole cleaning device (11); the side pressure controller (7) is arranged near the upper end of the water stop plug (8); and the drill bit (10) is connected to the end of the drill rod; The side pressure controller (7) and the water stop plug (8) are capable of moving up and down on the outside of the drilling cleaning device (11); It also includes a first bracket (22), a second bracket (18), a pulley (19), a motor (20), and a belt (21); the side pressure controller (7) is mounted on the first bracket (22); the water stop plug (8) is mounted on the second bracket (18); the first bracket (22) and the second bracket (18) are mounted on the belt (21); and the motor can drive the pulley (19) to drive the belt (21) to rotate.

2. The improved drilling water pressure test equipment according to claim 1, characterized in that: The motor (20) is a servo motor.

Images