Radial expansion interstitial testing device and method for static breakers

Abstract

The application belongs to the technical field of geotechnical engineering, and particularly relates to a static breaking agent radial expansion pressure indirect testing device and method, which comprises an external constraint system, the external constraint system comprises a seamless circular tube, the seamless circular tube is a tube body with one end closed and one end open; a rigid constraint frame, the rigid constraint frame is internally provided with the seamless circular tube, the seamless circular tube is internally provided with a radial expansion pressure testing tube, and the radial expansion pressure testing tube is filled with the static breaking agent; and a data acquisition and analysis system, the data acquisition and analysis system comprises an array type film pressure sensor, the array type film pressure sensor is pasted on an outer wall of the seamless circular tube, the array type film pressure sensor is connected with an input end of an industrial personal computer, and each measuring point pressure value of the array type film pressure sensor is recorded and analyzed through the industrial personal computer. The radial expansion pressure of the static breaking agent can be quickly solved, the change rule of the radial expansion pressure with time can be recorded in real time, and the accuracy of the measurement result is improved.

Description

Technical Field

[0001] This invention belongs to the field of geotechnical engineering technology, specifically relating to an indirect testing device and method for the radial expansion pressure of static fracturing agents. Background Technology

[0002] Static crushing technology involves mixing a static crushing agent (SCA) with water and filling the pores of a rock. The high radial expansion pressure generated during the hydration reaction of the SCA "quietly" crushes the rock. During the crushing process, the static crushing agent releases a large amount of heat, reaching temperatures of 140–150°C.

[0003] The magnitude of radial expansion pressure determines the rock fracturing effect, and scholars both domestically and internationally have conducted extensive research on radial expansion pressure testing. The resistance strain gauge method is a commonly used method for testing the radial expansion pressure of static fracturing agents. Its principle involves measuring the strain value by attaching a resistance strain gauge to the outer or inner wall of a steel pipe and then inferring the radial expansion pressure generated by the static fracturing agent. While the principle of the resistance strain gauge method is relatively simple, the test results are significantly affected by temperature, and the strain gauge attachment process is complex, cannot be reused, and has a high testing cost.

[0004] Existing static fracturing agent radial expansion pressure measurement equipment utilizes peripheral blocks and top and bottom baffles to form a closed chamber, which is filled with static fracturing agent. The radial expansion pressure of the static fracturing agent is calculated by dividing the reading of the force gauge between the fixed block and the peripheral block by the cross-sectional area of ​​the closed chamber. Existing methods for testing the radial expansion pressure of static fracturing agents establish a numerical relationship between the radial expansion pressure inside the simulated test tube and the pressure on the outer wall of the simulated test tube based on numerical simulation. Then, the radial expansion pressure of the static fracturing agent inside the simulated test tube is inferred by measuring the pressure value on the outer wall of the simulated test tube using a pressure sensor.

[0005] While the above two methods solve the problem of complex bonding processes for resistance strain gauges and their inability to be reused, existing radial expansion pressure testing methods cannot achieve multi-point radial expansion pressure testing at a low cost. In fact, due to the static fracturing agent filling process, the radial expansion pressure values ​​at each point are not the same. Therefore, using the radial expansion pressure value of one point as the result of the static fracturing agent radial expansion pressure test is not accurate. Summary of the Invention

[0006] The purpose of this invention is to provide an indirect testing device and method for the radial expansion pressure of static cracking agents, which can quickly calculate the radial expansion pressure of static cracking agents and record the change of radial expansion pressure over time in real time, thereby improving the accuracy of the measurement results.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An indirect testing device for the radial expansion pressure of a static decomposing agent, comprising:

[0009] An external constraint system, the external constraint system comprising a seamless circular tube, the seamless circular tube being a tube body with one end closed and the other end open;

[0010] A rigid constraint frame, wherein a seamless circular tube is installed inside the rigid constraint frame, a radial expansion pressure test tube is installed inside the seamless circular tube, and the radial expansion pressure test tube is filled with a static breaking agent;

[0011] The data acquisition and analysis system includes an array-type thin-film pressure sensor, which is attached to the outer wall of a seamless circular tube. The array-type thin-film pressure sensor is connected to the input terminal of an industrial control computer, which records and analyzes the pressure values ​​of each measuring point of the array-type thin-film pressure sensor.

[0012] The rigid constraint frame includes a bottom constraint steel plate at the bottom and a top constraint steel plate at the top. A large-diameter groove is provided in the center of the bottom constraint steel plate, and an oil outlet hole and a small-diameter groove opposite to the large-diameter groove are provided in the center of the top constraint steel plate. Through holes are opened on the edges of the bottom constraint steel plate and the top constraint steel plate. The two ends of the screw pass through the through holes of the bottom constraint steel plate and the top constraint steel plate, respectively, and are locked by hexagonal nuts.

[0013] The open end face of the seamless round tube has an annular groove, the closed end of the seamless round tube is installed in the large-diameter groove, the open end is matched with the top constraint steel plate, and an O-ring is installed in the annular groove.

[0014] The radial expansion pressure test tube is a split type, consisting of two symmetrical semi-circular tube segments axially divided. Its top end is embedded in a small-diameter groove in the top constraint steel plate. The split structure makes it easy to remove the solidified static breaking agent after the test is completed by disassembling the split radial expansion pressure test tube, so that the split radial expansion pressure test tube can be reused.

[0015] The aforementioned static cracking agent radial expansion pressure indirect testing device further includes a servo oil source control system. The servo oil source control system includes a servo oil source and a connector. The connector is installed on the oil outlet of the top constraint steel plate. The servo oil source is connected to the connector through a hydraulic oil pipe. When the servo oil source control system is set, the radial expansion pressure test tube is not filled with static cracking agent.

[0016] A method for testing the radial expansion pressure of a static breaker using an indirect testing device includes the following steps:

[0017] Step 1: Assemble the indirect test device for radial expansion pressure of static breaker agent, and fill the split radial expansion pressure test tube with static breaker agent;

[0018] The screw is passed through the bottom constraint steel plate and fixed with a nut. A seamless round tube is placed in the large-diameter groove of the bottom constraint steel plate, and the array-type thin-film pressure sensor is glued to the outer wall of the seamless round tube. Two semi-circular tube segments are fitted together to form a split-type radial expansion pressure test tube, which is then placed inside the seamless round tube. A static rupture agent cartridge with the same inner diameter as the split-type radial expansion pressure test tube is soaked in water and placed inside the split-type radial expansion pressure test tube; or a slurry-like static rupture agent (i.e., static rupture agent diluted with water) is poured into the split-type radial expansion pressure test tube. The small-diameter groove on the top constraint steel plate is embedded into the upper end of the split-type radial expansion pressure test tube, and the split-type radial expansion pressure test tube and the seamless round tube are fixed between the bottom and top constraint steel plates with hexagonal nuts. After the above work is completed, the array-type thin-film pressure sensor is connected to the industrial control all-in-one computer via wires.

[0019] Step 2: Establish the radial expansion pressure at each measuring point as a function of the static fracturing agent hydration reaction time.

[0020] Open the industrial control all-in-one computer and call the radial expansion pressure P generated by the static breaking agent inside the split radial expansion pressure test tube. r The average outer wall pressure F of the seamless circular tube measured by the array-type thin-film pressure sensor o The numerical model between; click the "Start Acquisition of Radial Expansion Pressure" button, and the industrial control all-in-one computer will display in real time the radial expansion pressure P generated by the static breaking agent in the separate radial expansion pressure test tube, measured at each measuring point of the array-type thin-film pressure sensor. r Curve showing the change in hydration reaction time (h) of the static fracturing agent;

[0021] Step 3: Calculate the average maximum radial expansion pressure.

[0022] After the data collection is completed, the average maximum radial expansion pressure value is automatically output. The calculation formula is as follows:

[0023]

[0024] In the formula: - Average maximum radial expansion pressure, MPa; N - Number of measuring points in the array-type thin-film pressure sensor; P r1max P r2max ...P rNmax - The maximum radial expansion pressure value measured at the Nth membrane pressure sensor measuring point.

[0025] In step 2, the radial expansion pressure P generated by the static breaking agent inside the split-type radial expansion pressure test tube... rThe average outer wall pressure F of the seamless circular tube measured by the array-type thin-film pressure sensor o The numerical model between them is established according to the following method:

[0026] Step 2.1: Assemble the indirect test device for the radial expansion pressure of the static fracture agent and fill the split radial expansion pressure test tube with hydraulic oil;

[0027] The screw is passed through the bottom constraint steel plate and fixed with a nut. A seamless round tube is placed in the large-diameter groove of the bottom constraint steel plate, and the array-type thin-film pressure sensor is glued to the outer wall of the seamless round tube. Two semi-circular tube segments are embedded to form a split radial expansion pressure test tube, which is then placed inside the seamless round tube, and hydraulic oil is injected until the oil level is flush with the top of the seamless round tube. The small-diameter groove on the top constraint steel plate is inserted into the upper end of the split radial expansion pressure test tube, and the split radial expansion pressure test tube and the seamless round tube are fixed between the bottom and top constraint steel plates with a hexagonal nut. The connector is installed in the oil outlet hole and connected to the servo oil source via a hydraulic oil pipe. After the above work is completed, the array-type thin-film pressure sensor is connected to the industrial control all-in-one computer via a wire.

[0028] Step 2.2: Establish the radial expansion pressure P generated by the static fracturing agent inside the split-type radial expansion pressure test tube. r The average outer wall pressure F of the seamless circular tube measured by the array-type thin-film pressure sensor o Numerical models between

[0029] Turn on the industrial control all-in-one computer; simultaneously start the servo hydraulic power control system. The hydraulic power source injects oil and pressurizes the split radial expansion pressure test tube through hydraulic oil pipes and connectors to simulate the radial expansion pressure P generated by the static fracturing agent. r When the oil pressure reaches the set value, click the "Seamless Circular Tube Outer Wall Pressure Value Acquisition" button to collect the pressure values ​​of the seamless circular tube's outer wall measured at various points by the array-type diaphragm pressure sensor in real time, and automatically calculate the average outer wall pressure value. The calculation formula is as follows:

[0030]

[0031] In the formula: - The average pressure value calculated when the oil pressure is the set value; N - The number of measuring points of the array-type thin-film pressure sensor; F o-设定值-1 F o-设定值-2 ...F o-设定值-N - The pressure value measured at the Nth diaphragm pressure sensor measuring point when the oil pressure is the set value;

[0032] After the data collection is completed, the industrial control computer automatically fits the curve of the average pressure value changing with the oil pressure, and outputs the radial expansion pressure P generated by the static fracturing agent in the split radial expansion pressure test tube.r The average outer wall pressure F of the seamless circular tube measured by the array-type thin-film pressure sensor o Numerical models between them.

[0033] The technical effects of this invention are as follows:

[0034] 1. This invention, through the use of seamless steel pipes and an array-type thin-film pressure sensor, indirectly calculates the radial expansion pressure of the static breaking agent inside the split radial expansion pressure test tube by measuring the pressure on the outer wall of the seamless circular pipe. This enables multi-point measurement, direct reading, and real-time recording of the radial expansion pressure variation over time. Simultaneously, it avoids the impact of high temperatures during the expansion process of the static breaking agent on the measurement accuracy and service life of the array-type thin-film pressure sensor, thus improving the accuracy of the measurement results and extending the service life of the array-type thin-film pressure sensor.

[0035] 2. This invention arranges an array-type thin-film pressure sensor on the outer wall of a seamless circular tube, and uses an indirect method to test the radial expansion pressure value generated inside the split radial expansion pressure test tube. This achieves the purpose of measuring high radial expansion pressure with a small-range array-type thin-film pressure sensor, reduces the wear of the array-type thin-film pressure sensor, improves the service life of the array-type thin-film pressure sensor, and reduces testing costs.

[0036] 3. This invention can test the radial expansion pressure of static fracturing agent in boreholes of different diameters by replacing the split radial expansion pressure test tubes with different inner diameters.

[0037] 4. The device of the present invention is reusable, low in cost, and meets environmental protection requirements. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the indirect testing device for the radial expansion pressure of static decomposing agents.

[0039] Figure 2 A schematic diagram of the rigid constraint frame in the indirect testing device for the radial expansion pressure of static fracturing agent;

[0040] Figure 3 for Figure 2 A schematic diagram of direction AA;

[0041] Figure 4 for Figure 2 A schematic diagram of the BB direction;

[0042] Figure 5 This is a schematic diagram of the external constraint system in the indirect testing device for the radial expansion pressure of static decomposing agent.

[0043] Figure 6 Top view of the external constraint system in the indirect test device for radial expansion pressure of static destructive agent;

[0044] Figure 7 This is a schematic diagram of a split-type radial expansion pressure test tube in an indirect testing device for static decomposing agents.

[0045] Figure 8 for Figure 7 CC-direction schematic diagram;

[0046] Figure 9 This is a schematic diagram of the data acquisition and analysis system in the indirect testing device for the radial expansion pressure of static decomposing agents.

[0047] Figure 10 A schematic diagram of a numerical model analysis device for the radial expansion pressure generated by the static breaking agent inside the split radial expansion pressure test tube and the average outer wall pressure of the seamless circular tube measured by an array-type thin-film pressure sensor.

[0048] Figure 11 A schematic diagram of the servo oil source control system in the numerical model analysis device for the radial expansion pressure generated by the static breaking agent inside the split radial expansion pressure test tube and the average outer wall pressure of the seamless circular tube measured by the array-type thin film pressure sensor.

[0049] Figure 12 Taking a 90mm borehole as an example, the radial expansion pressure change curve of the static breaking agent in the split radial expansion pressure test tube as a function of hydration reaction time (h) was measured using the device of the present invention (taking measuring point 1 in the thin film pressure sensor as an example).

[0050] Figure 13 The numerical model analysis device uses the radial expansion pressure generated by the static fracturing agent inside the split-type radial expansion pressure test tube and the average outer wall pressure of the seamless circular tube measured by the array-type diaphragm pressure sensor to obtain the curve of the average pressure value as a function of oil pressure. Based on this curve, the numerical model of the radial expansion pressure generated by the static fracturing agent inside the split-type radial expansion pressure test tube and the average outer wall pressure of the seamless circular tube measured by the array-type diaphragm pressure sensor is input into the industrial control integrated computer to obtain... Figure 8 The radial expansion pressure variation curve is shown.

[0051] 1. Rigid constraint frame; 1-1. Bottom constraint steel plate; 1-2. Top constraint steel plate; 1-3. Screw; 1-4. Hexagonal nut; 1-5. Large diameter groove; 1-6. Oil outlet; 1-7. Small diameter groove; 2. External constraint system; 2-1. Seamless round tube; 2-2. Annular groove; 2-3. O-ring; 3. Split-type radial expansion pressure test tube; 3-1. Semi-circular tube segment; 4. Data acquisition and analysis system; 4-1. Array-type thin-film pressure sensor; 4-2. Industrial control all-in-one computer; 5-1. Connector; 5-2. Hydraulic oil pipe; 5-3. Servo oil source; 6. Static breaking agent. Detailed Implementation

[0052] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0053] In this embodiment of the invention, a static fracturing agent 6 is used for blasting a 90mm borehole in a mine. The radial expansion pressure generated by the static fracturing agent 6 in the borehole is tested using an indirect testing device and method.

[0054] Example 1

[0055] like Figure 1 As shown, an indirect testing device for the radial expansion pressure of a static decomposing agent includes...

[0056] External constraint system 2, the external constraint system 2 includes a seamless circular tube 2-1, the seamless circular tube 2-1 is a tube body with one end closed and the other end open;

[0057] A rigid constraint frame 1, wherein a seamless circular tube 2-1 is installed inside the rigid constraint frame 1, a radial expansion pressure test tube is installed inside the seamless circular tube 2-1, and a static breaking agent 6 is filled inside the radial expansion pressure test tube;

[0058] The data acquisition and analysis system 4 includes an array-type thin-film pressure sensor 4-1, which is attached to the outer wall of the seamless circular tube 2-1. The array-type thin-film pressure sensor 4-1 is connected to the input end of the industrial control computer 4-2, and the pressure values ​​of each measuring point of the array-type thin-film pressure sensor 4-1 are recorded and analyzed by the industrial control computer 4-2.

[0059] In this embodiment, the array-type thin-film pressure sensor 4-1 is a 5×1 array-type thin-film pressure sensor. In other embodiments besides this one, the array-type thin-film pressure sensor 4-1 can also be 3×3, 5×3, 4×4 or other models.

[0060] Because stress attenuates during its transmission within the seamless circular tube 2-1, the stress on the outer wall is much smaller than the stress on the inner wall. Meanwhile, for a given fixed material, the stress P on the inner wall of the seamless circular tube 2-1 is... r and external wall pressure F o There is a certain correspondence between them: P r =f(F o Based on the above principle, the pressure on the outer wall of the seamless circular tube 2-1 can be directly tested by a small-range array-type thin-film pressure sensor 4-1, which can obtain the high radial expansion pressure generated by the static breaking agent 6 inside the seamless circular tube 2-1; at the same time, the array-type thin-film pressure sensor 4-1 can avoid friction damage during the test and can be reused.

[0061] like Figures 2 to 4As shown, the rigid constraint frame 1 includes a bottom constraint steel plate 1-1 at the bottom and a top constraint steel plate 1-2 at the top. A large-diameter groove 1-5 is provided in the center of the bottom constraint steel plate 1-1, and a stepped oil outlet hole 1-6 and a small-diameter groove 1-7 opposite to the large-diameter groove 1-5 are provided in the center of the top constraint steel plate 1-2. Through holes are opened on the edges of the bottom constraint steel plate 1-1 and the top constraint steel plate 1-2. The two ends of the screw 1-3 pass through the through holes of the bottom constraint steel plate 1-1 and the top constraint steel plate 1-2 respectively, and are locked by hexagonal nuts 1-4. The oil outlet hole 1-6, the small-diameter groove 1-7 and the large-diameter groove 1-5 are coaxially arranged.

[0062] In this embodiment, the bottom constraint steel plate 1-1 and the top constraint steel plate 1-2 are made of high-strength rigid material, with a length × width × thickness of 200 × 200 × 20 mm; the large diameter groove 1-5 has a diameter of 130 mm and a depth of 10 mm; the oil outlet hole 1-6 has a diameter of 60 mm; and the small diameter groove 1-7 has an inner diameter of 70 mm, an outer diameter of 90 mm, and a depth of 10 mm.

[0063] like Figure 5 and Figure 6 As shown, the open end face of the seamless round tube 2-1 is provided with an annular groove 2-2, the closed end of the seamless round tube 2-1 is installed in the large diameter groove 1-5, the open end is matched with the top constraint steel plate 1-2, and an O-ring 2-3 is installed in the annular groove 2-2.

[0064] In this embodiment, the seamless round tube 2-1 has an inner diameter of 110mm, an outer diameter of 130mm, a length of 160mm, a closed end thickness of 10mm, and is made of 15CrMo alloy steel; the annular groove 2-2 has an inner diameter of 140mm and an outer diameter of 150mm.

[0065] like Figure 7 and Figure 8 As shown, the split-type radial expansion pressure test tube 3 is sized to match the seamless circular tube 2-1 and is placed inside the seamless circular tube 2-1. It consists of two symmetrically divided semi-circular tube segments 3-1 along the axis, with their top ends embedded in the small-diameter grooves 1-7 of the top constraint steel plate 1-2. The inner diameter of the semi-circular tube segment 3-1 is 70mm, the thickness is 10mm, and the length is 160mm. The split-type structure facilitates the removal of the expanded and solidified static breaking agent 6 after the test is completed by disassembling the split-type radial expansion pressure test tube 3, making the split-type radial expansion pressure test tube 3 reusable.

[0066] like Figures 9 to 11As shown, the static cracking agent radial expansion pressure indirect testing device further includes a servo oil source control system. The servo oil source control system includes a servo oil source 5-3 and a connector 5-1. The connector 5-1 is installed on the oil outlet 1-6 of the top constraint steel plate 1-2. The servo oil source 5-3 is connected to the connector 5-1 through a hydraulic oil pipe 5-2. When the servo oil source control system is set, the split radial expansion pressure testing tube 3 is not filled with static cracking agent 6.

[0067] A method for testing the radial expansion pressure of a static fracturing agent using an indirect testing device, such as... Figure 12 and Figure 13 As shown, it includes the following steps:

[0068] Step 1: Establish the radial expansion pressure P generated by the static breaking agent 6 inside the split radial expansion pressure test tube 3. r The average outer wall pressure F of the seamless circular tube 2-1 measured by the array-type thin-film pressure sensor 4-1 o Numerical models between

[0069] Step 1.1: Assemble the indirect test device for the radial expansion pressure of the static fracture agent, and fill the split radial expansion pressure test tube 3 with hydraulic oil;

[0070] Pass the screw 1-3 through the bottom constraint steel plate 1-1 and fix the bottom constraint steel plate 1-1 with a nut; place the seamless round tube 2-1 into the large-diameter groove 1-5 in the bottom constraint steel plate 1-1, and attach the 5×1 array-type diaphragm pressure sensor 4-1 to the outer wall of the seamless round tube 2-1 with adhesive; insert the two semi-circular tube segments 3-1 into the seamless round tube 2-1 to form a split radial expansion pressure test tube 3, and fill it with No. 68 hydraulic oil until the hydraulic oil level is above the upper end of the seamless round tube 2-1. Align the top with the bottom constraint steel plate 1-2; embed the small diameter groove 1-7 on the top constraint steel plate 1-2 into the upper end of the split radial expansion pressure test tube 3, and fix the split radial expansion pressure test tube 3 and the seamless round tube 2-1 between the bottom constraint steel plate 1-1 and the top constraint steel plate 1-2 with the hexagonal nut 1-4; install the connector 5-1 in the oil outlet hole 1-6, and connect it to the servo oil source 5-3 through the hydraulic oil pipe 5-2; after the above work is completed, connect the array-type thin film pressure sensor 4-1 to the industrial control all-in-one computer 4-2 through the wire;

[0071] Step 1.2: Establish the radial expansion pressure P generated by the static breaking agent 6 inside the split radial expansion pressure test tube 3. r The average outer wall pressure F of the seamless circular tube 2-1 measured by the array-type thin-film pressure sensor 4-1 o Numerical models between

[0072] Turn on the industrial control all-in-one computer 4-2 and simultaneously start the servo oil source control system; the oil source injects oil and pressurizes it into the split radial expansion pressure test tube 3 through the hydraulic oil pipe 5-2 and connector 5-1 to simulate the radial expansion pressure P generated by the static breaking agent 6. r When the oil pressure reaches the set value of 20MPa, click the button to collect the pressure value of the outer wall of the seamless round tube 2-1. The pressure values ​​measured at each point of the array-type diaphragm pressure sensor 4-1 will be collected in real time, and the average outer wall pressure value will be automatically calculated. The calculation formula is as follows:

[0073]

[0074] In the formula: - The calculated average pressure value when the oil pressure is 20MPa; N - The number of measuring points of the array-type thin-film pressure sensor; F o-20-1 F o-20-2 …F o-20-N - The pressure value measured at the Nth diaphragm pressure sensor measuring point when the oil pressure is 20MPa;

[0075] Step 1.3: After data acquisition, continue injecting oil and pressurizing to 40, 60, 80, and 100 MPa respectively. Then, click "Acquisition of Pressure Value on the Outer Wall of Seamless Circular Tube 2-1" again. Real-time acquisition of the pressure values ​​on the outer wall of the seamless circular tube 2-1 measured at each point by the array-type diaphragm pressure sensor, and automatic calculation of the average pressure value at 40, 60, 80, and 100 MPa. After the 100 MPa oil pressure data acquisition is completed, the Matlab software built into the industrial control all-in-one computer 4-2 automatically fits the curve of the average pressure value changing with the oil pressure, as shown below. Figure 13 As shown, the radial expansion pressure P generated by the static breaking agent 6 inside the split-type radial expansion pressure test tube 3 is... r The average outer wall pressure F of the seamless circular tube 2-1 measured by the array-type thin-film pressure sensor 4-1 o The numerical model analysis results between them are P r =2F o ;

[0076] Step 2: Drain the hydraulic oil from the split radial expansion pressure test tube 3 in Step 1.1, and immerse the static rupture agent 6 roll with a diameter of 90 mm and a length of 150 mm in water at a temperature of 20°C for 10 minutes before placing it into the split radial expansion pressure test tube 3.

[0077] Step 3: Establish the curves of radial expansion pressure at each measuring point as a function of static fracturing agent hydration reaction time.

[0078] Open the industrial control all-in-one computer 4-2 to call the radial expansion pressure P generated by the static breaking agent 6 inside the split radial expansion pressure test tube 3. r The average outer wall pressure F of the seamless circular tube 2-1 measured by the array-type thin-film pressure sensor 4-1o Numerical model between; click the "Start Acquisition of Radial Expansion Pressure" button, such as Figure 12 As shown, taking measuring point 1 of the array-type thin-film pressure sensor 4-1 as an example, the industrial control integrated computer 4-2 displays in real time the radial expansion pressure P generated by the static breaking agent 6 in the split radial expansion pressure test tube 3 measured by each measuring point of the array-type thin-film pressure sensor 4-1. r Curve showing the change in hydration reaction time (h) of static fracturing agent 6;

[0079] Step 4: Calculate the average maximum radial expansion pressure.

[0080] After the data collection is completed, the average maximum radial expansion pressure value is automatically output. The calculation formula is as follows:

[0081]

[0082] In the formula: - Average maximum radial expansion pressure, MPa; N - Number of measuring points in the array-type thin-film pressure sensor; P r1max P r2max ...P rNmax - The maximum radial expansion pressure value measured at the Nth membrane pressure sensor measuring point;

[0083] The system automatically calculated the average maximum radial expansion pressure to be 69.9 MPa.

[0084] Example 2

[0085] The difference between Example 2 and Example 1 is as follows:

[0086] Step 1 involves filling the split-type radial expansion pressure test tube 3 with static breaking agent 6. This is done by mixing water and static breaking agent 6 at a water-cement ratio of 20%, stirring thoroughly with a glass rod, and then pouring the mixture into the split-type radial expansion test tube using a funnel.

[0087] The radial expansion pressure P generated by the static breaking agent 6 inside the split radial expansion pressure test tube 3 is... r The average outer wall pressure F of the seamless circular tube 2-1 measured by the array-type thin-film pressure sensor 4-1 o The numerical model analysis results between them are P r =2F o The system automatically calculated the average maximum radial expansion pressure to be 69.9 MPa.

Claims

1. An indirect testing device for the radial expansion pressure of a static decomposing agent, characterized in that, include An external constraint system, the external constraint system comprising a seamless circular tube, the seamless circular tube being a tube body with one end closed and the other end open; A rigid constraint frame, wherein a seamless circular tube is installed inside the rigid constraint frame, a radial expansion pressure test tube is installed inside the seamless circular tube, and the radial expansion pressure test tube is filled with a static breaking agent; A data acquisition and analysis system includes an array-type thin-film pressure sensor, which is attached to the outer wall of a seamless circular tube. The array-type thin-film pressure sensor is connected to the input terminal of an industrial control computer, and the pressure values ​​of each measuring point of the array-type thin-film pressure sensor are recorded and analyzed by the industrial control computer. The rigid constraint frame includes a bottom constraint steel plate at the bottom and a top constraint steel plate at the top. A large-diameter groove is provided in the center of the bottom constraint steel plate, and an oil outlet hole and a small-diameter groove are provided in the center of the top constraint steel plate. Through holes are opened on the edges of the bottom constraint steel plate and the top constraint steel plate. The two ends of the screw pass through the through holes of the bottom constraint steel plate and the top constraint steel plate, respectively, and are locked by hexagonal nuts. The open end face of the seamless round tube is provided with an annular groove, the closed end of the seamless round tube is installed in the large-diameter groove, the open end is matched with the top constraint steel plate, and an O-ring is installed in the annular groove. The radial expansion pressure test tube is a split radial expansion pressure test tube, which is composed of two symmetrical semi-circular tube pieces that are axially divided. Its top end is embedded in a small-diameter groove in the top constraint steel plate. The split structure makes it easy to remove the solidified static breaking agent after the test is completed by disassembling the split radial expansion pressure test tube, so that the split radial expansion pressure test tube can be reused. It also includes a servo oil source control system, which includes a servo oil source and a connector. The connector is installed on the oil outlet of the top constraint steel plate. The servo oil source is connected to the connector through a hydraulic oil pipe. When the servo oil source control system is set, the split radial expansion pressure test tube is not filled with static breaking agent.

2. The method for testing the radial expansion pressure of a static fracturing agent using an indirect testing device for radial expansion pressure of a static fracturing agent according to claim 1, characterized in that, Includes the following steps: Step 1: Assemble the indirect test device for radial expansion pressure of static breaker agent, and fill the split radial expansion pressure test tube with static breaker agent; The screw is passed through the bottom constraint steel plate and fixed with a nut. A seamless round tube is placed in the large-diameter groove of the bottom constraint steel plate, and the array-type thin-film pressure sensor is glued to the outer wall of the seamless round tube. Two semi-circular tube segments are fitted together to form a split-type radial expansion pressure test tube, which is then placed inside the seamless round tube. A static rupture agent cartridge with the same inner diameter as the split-type radial expansion pressure test tube is soaked in water and placed inside the split-type radial expansion pressure test tube; or a slurry-like static rupture agent (i.e., static rupture agent diluted with water) is poured into the split-type radial expansion pressure test tube. The small-diameter groove on the top constraint steel plate is embedded into the upper end of the split-type radial expansion pressure test tube, and the split-type radial expansion pressure test tube and the seamless round tube are fixed between the bottom and top constraint steel plates with hexagonal nuts. Finally, the array-type thin-film pressure sensor is connected to the industrial control all-in-one computer via wires. Step 2: Establish the curves of radial expansion pressure at each measuring point as a function of static fracturing agent hydration reaction time; Open the industrial control all-in-one computer and call the radial expansion pressure P generated by the static breaking agent inside the split radial expansion pressure test tube. r The average outer wall pressure F of the seamless circular tube measured by the array-type thin-film pressure sensor o The numerical model between; click the "Start Acquisition of Radial Expansion Pressure" button, and the industrial control all-in-one computer will display in real time the radial expansion pressure P generated by the static breaking agent in the separate radial expansion pressure test tube, measured at each measuring point of the array-type thin-film pressure sensor. r Curve showing the change in hydration reaction time (h) of the static fracturing agent; Step 3: Calculate the average maximum radial expansion pressure. After the data collection is completed, the average maximum radial expansion pressure value is automatically output. The calculation formula is as follows: （1） In the formula: Average maximum radial expansion pressure, MPa; N-Number of measuring points in an array-type thin-film pressure sensor; P r1max P r2max ...P rNmax - The maximum radial expansion pressure value measured at the Nth membrane pressure sensor measuring point.

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