Soluble metal material performance test method and test system

Abstract

The invention relates to the technical field of test of soluble metal materials for soluble bridge plugs of oil and gas well staged fracturing tools, and discloses a soluble metal material performance test method and test system.The method comprises the steps that a mechanical property test sample of the soluble metal material is sampled; the test sample comprises a tensile sample, a compression sample and a dissolution sample; performing a mechanical property test on the test sample of the soluble metal material under a first condition; and testing the solubility of the test sample of the soluble metal material under a second condition. By testing the mechanical property, the dissolving property and the like of the soluble metal material under different conditions, various properties and laws of the soluble metal material can be mastered more systematically and accurately, and a comprehensive performance testing and evaluating method and system of different materials under different conditions are established; data reference is provided for deeply developing customized and personalized material optimization and matching, and a theoretical basis is provided for product optimization design.

Description

Technical Field

[0001] The invention relates to the technical field of testing soluble metal materials for soluble bridge plugs of staged fracturing tools for oil and gas wells, and in particular to a soluble metal material performance testing method and a testing system. Background Art

[0002] In the development of domestic unconventional oil and gas resources (shale gas, shale oil, tight oil, etc.), more than 90% need reservoir transformation measures to obtain relatively ideal production capacity. In addition, as major oil fields have successively entered the medium and high water content period, the strata to be developed have gradually developed into thin and poor layers. In order to increase oil recovery and improve oil field production efficiency, layered injection and production and multi-stage fracturing of horizontal wells are currently the main technologies for unconventional oil and gas development. Soluble bridge plugs are a core tool in the construction process of horizontal well staged fracturing newly introduced in recent years, and their application is becoming more and more extensive. "Soluble bridge plug + cluster perforation joint operation technology" is the main process technology for horizontal well staged fracturing. Compared with traditional bridge plugs, soluble bridge plugs have the advantages of not being limited by the length of the horizontal section, dissolving by themselves after pressure, no need for drilling and grinding, high operation timeliness, low accident rate, and rapid production. They can significantly reduce engineering risks, greatly improve operation efficiency, and reduce operation costs.

[0003] The main body of the soluble bridge plug currently available on the market is made of soluble magnesium alloy material, which has the characteristics of high strength, pressure resistance of 70MPa, solubility in water, and controllable dissolution time. The strong plasticity, stiffness and processing properties of magnesium alloy materials are far superior to those of degradable polymer materials, and their degradation rate can be effectively controlled by composition design, heat treatment, plastic processing, surface treatment and other methods. As a key soluble material for the preparation of soluble bridge plugs for staged fracturing, it is increasingly widely used. While being widely used, the technological progress and application evaluation of soluble bridge plugs and magnesium alloy materials also face many different production needs and challenges; therefore, domestic and foreign countries have continuously improved the preparation process, optimized the microstructure, adjusted the added elements, and surface treatment processes to make magnesium alloy materials more excellent in mechanical properties and solubility properties.

[0004] At present, the testing and analysis methods of magnesium alloy mechanical properties, corrosion behavior, dissolution rate, etc. have basically formed relatively mature methods in China. However, in the application of soluble magnesium alloy materials in the field of fracturing soluble bridge plugs, the development trend of its testing methods is to put forward different requirements for the performance of soluble materials and soluble bridge plugs based on the actual construction process on site and the differences in multiple aspects such as different formation temperatures, wellbore conditions and downhole operating environments, and to carry out tests on the overall performance and applicability of soluble bridge plugs. Due to the large differences in formation temperature, wellbore conditions and downhole operating environments of major domestic oil and gas fields, the differences in well types, fluids, temperatures, mineralization, casing types and materials, construction processes and dissolution requirements, etc., different requirements are put forward for the performance of soluble materials and soluble bridge plugs, such as: material applicability issues under different conditions, the contradiction between pressure bearing and dissolution, and the problems of pressure bearing stability, reliability and dissolution speed and time. In addition, casing deformation frequently occurs in horizontal wells during hydraulic fracturing, and the same casing requires a series of bridge plugs with different outer diameters, especially in shale gas and shale oil blocks. There is a large demand for small-sized, high-expansion-rate soluble bridge plugs, the slip engagement distance becomes longer, the rubber tube expansion rate becomes higher, and the material performance requirements become higher, which greatly increases the difficulty of material selection and design of soluble bridge plugs. Therefore, the design of soluble bridge plugs and the application of soluble magnesium alloys need to be targeted at different regions, different wellbores and operating conditions, combined with the analysis and testing of indicators and characteristics such as mechanical properties and dissolution rates of different materials, master their various performance indicators and applicable conditions, carry out customized and personalized material selection and optimization design, improve the applicability and reliability of bridge plug products in different wellbores and operating conditions, ensure their stable pressure bearing and controllable dissolution time, thereby promoting technological progress and helping to improve the quality and reduce the cost of unconventional oil and gas resources such as tight oil and gas, shale oil and gas, and horizontal well staged fracturing operations.

[0005] The patent document with announcement number CN203798672U discloses a curved surface specimen tensile performance test fixture, which is used to test the tensile performance of curved surface shape specimens. The fixture consists of a tie rod, a tie rod sleeve, a pressure plate assembly, a connecting pin, a fastening bolt, etc. The fixture has a simple structure and is easy to use. On the basis of meeting the national standard for material tensile performance testing, it realizes the testing of tensile performance indicators of various curved surface shape specimens.

[0006] The patent document with publication number CN113155592A discloses a low-temperature tensile test device for metal materials, which has a simple structure, convenient sample disassembly and assembly, good practicality, and can be widely used in various types of universal testing machines. The metal sample will not be deformed by twisting during installation and stretching, ensuring that the metal sample is unidirectionally stretched during deformation, and a refrigerant storage area is specially set at the bottom of the insulation barrel, which can ensure that the entire stretching process of the sample is carried out under liquid nitrogen conditions, and the deformation temperature of the metal sample cannot be confirmed, which solves the technical problem of the lack of a universal and simple low-temperature tensile test device.

[0007] Patent document with publication number CN103954512A discloses a fracture toughness test device and method for C(T) specimens in a low temperature environment, which accurately measures the loading line displacement of the C(T) specimen immersed in a low temperature liquid medium, while avoiding direct contact between the extensometer and the liquid medium, which may cause it to be easily damaged. The device has a simple and reliable structure and is easy to install and operate.

[0008] The above test devices or methods in the prior art can only test the performance of a certain aspect of metal materials, but cannot evaluate the comprehensive performance of all aspects of metal materials. Therefore, it is urgent to study a new test method or device that can more effectively carry out the mechanical properties, solubility properties and other tests of soluble metal materials under different conditions, and more systematically and accurately grasp the various properties and laws of soluble metal materials. Summary of the invention

[0009] The purpose of the present invention is to provide a soluble metal material performance testing method and test system, to provide a more effective testing method for the performance testing of soluble metal materials used in soluble bridge plugs for staged fracturing tools in oil and gas wells, and to more systematically and accurately grasp the various properties and laws of soluble metal materials by carrying out tests on the mechanical properties, solubility properties, etc. of soluble metal materials under different conditions, to establish a comprehensive performance testing and evaluation method and system for different materials under different conditions, to provide data reference for in-depth customized and personalized material optimization and matching, to provide a theoretical basis for product optimization design, to further improve the comprehensive performance of products, and to better meet and adapt to actual working conditions. To achieve the above purpose, the present invention provides the following technical solutions:

[0010] The present invention provides a method for testing the performance of a soluble metal material, the method comprising the following steps:

[0011] Sampling the mechanical property test specimens of the soluble metal material; the test specimens include: tensile specimens, compression specimens and dissolution specimens;

[0012] Performing a mechanical property test on a test specimen of the soluble metal material under a first condition;

[0013] The dissolution performance test is performed on the test sample of the soluble metal material under the second condition.

[0014] Furthermore, the tensile specimens are sampled at three different axial positions of the bar: R / 4, R / 2 and 3R / 4;

[0015] The compression test specimen is sampled at the radial R / 2 position of the bar;

[0016] The dissolution samples are sampled at two different axial positions R / 2 and 3R / 4; wherein,

[0017] The tensile test specimen is in the shape of a round rod, with a diameter of 5-10 mm and a length of 10-15 times the diameter;

[0018] The compression specimen is in the shape of a round rod, with a diameter of 10-20 mm and a length of 1-3 times the diameter.

[0019] Furthermore, the first condition includes: testing the mechanical properties of different materials under two conditions: different temperatures and different temperature liquid immersion; wherein,

[0020] The different temperatures range from 25°C to 175°C;

[0021] The concentration of the liquid at different temperatures is in the range of 500ppm to 15000ppm in terms of chloride ion concentration; or

[0022] Calculated by mass fraction of potassium chloride or sodium chloride, the range is 0.1% to 3.0%.

[0023] Furthermore, the mechanical properties test includes: a tensile test and a compression test; wherein,

[0024] Tensile test is used to test the tensile strength, plastic extension strength, elongation after fracture and section shrinkage of materials;

[0025] Compression testing is used to measure the yield strength, plastic compressive strength and elastic modulus of a material.

[0026] Furthermore, the second condition includes: a material solubility test in a solution of the same medium at different temperatures; a material solubility test in a solution of the same temperature at different media, wherein:

[0027] The range of the different temperatures is 25°C to 175°C;

[0028] The different media have a concentration of chloride ions ranging from 500ppm to 15000ppm; or,

[0029] Calculated by mass fraction of potassium chloride or sodium chloride, the range is 0.1% to 3.0%.

[0030] The present invention also provides a soluble metal material performance test system.

[0031] The system comprises: a pressure control unit, a temperature control unit, a loading device and a solution compensation unit; wherein,

[0032] The pressure control unit is connected to the loading device via a hydraulic pipeline;

[0033] The temperature control unit is connected to the loading device via a wire;

[0034] The solution compensation unit is connected to the temperature control unit via a liquid injection line;

[0035] The loading device generates an axial load and controls the direction of movement through the pressure input by the pressure control unit;

[0036] The temperature control unit is used to adjust and control the heating temperature;

[0037] The solution compensation unit is used to inject, discharge or compensate liquid or solution to the temperature control unit.

[0038] Furthermore, the pressure control unit includes: a control system and a hydraulic source; wherein,

[0039] The control system and the hydraulic source are connected via a wire.

[0040] Furthermore, the temperature control unit includes: an induction heating system, a temperature measurement module, a pressure gauge, an overflow safety valve and a thermostatic box; wherein,

[0041] The induction heating system and the temperature measurement module are connected via a wire;

[0042] The temperature measurement module is provided with a plurality of temperature sensors, some of which are arranged on the outer surface of the thermostat, and some of which are arranged in the cavity of the thermostat;

[0043] The pressure gauge and the overflow safety valve are arranged on the upper part of the thermostatic box.

[0044] Furthermore, the loading device comprises: a hydraulic piston cylinder and a clamping mechanism, wherein:

[0045] The hydraulic piston cylinder is directly connected to the clamping mechanism, which is composed of a group of symmetrically distributed fixing clamps and is arranged in the thermostatic box cavity of the temperature control unit.

[0046] Furthermore, the solution compensation unit includes: a solution tank, an electric circulation pump, a ball valve, and a liquid injection pipeline, wherein:

[0047] The solution tank is connected to the electric circulation pump through a liquid injection pipeline; the electric circulation pump is connected to a thermostat of a temperature control unit through the liquid injection pipeline, and ball valves are arranged at the upper and lower ends of the thermostat.

[0048] Technical effects and advantages of the present invention:

[0049] The soluble metal material performance testing method and test system of the present invention optimizes the test method of the mechanical properties of the material, and establishes a comprehensive performance test evaluation method and system for different materials under different conditions. By carrying out tests on the mechanical properties, solubility properties and other tests of soluble metal materials under different conditions, it is helpful to systematically and accurately grasp the various mechanical performance indicators of soluble metal materials and the differences and change laws under different conditions, and then through comparative analysis and verification of material test results, it can provide data reference for in-depth customized and personalized material optimization and matching, and provide a theoretical basis for product optimization design. By testing and mastering the comprehensive mechanical properties of materials, it is beneficial to improve the understanding of materials, enhance the matching of materials, meet the needs of specific working conditions in different regions, and further regulate the effective service time of soluble metal materials in specific environments to obtain the best pressure-bearing and solubility properties of soluble bridge plugs, promote the improvement of the comprehensive performance of soluble bridge plug products, and ultimately form a selection method for optimizing soluble metal materials and improving working condition matching under different wellbore conditions, guide the material optimization and structural optimization design of soluble bridge plugs, develop low-cost, high-performance serialized soluble bridge plug products, improve comprehensive performance, promote the improvement of the comprehensive performance of soluble bridge plug products and the industrialization and promotion of bridge plugs, and help improve the quality and reduce the cost of unconventional oil and gas resource development such as tight oil and gas, shale oil and gas, and horizontal well staged fracturing operations.

[0050] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0052] Figure 1 A flow chart of a soluble metal material performance testing method provided by the present invention;

[0053] Figure 2a A schematic diagram of the axial sampling plane of the tensile specimen provided by the present invention;

[0054] Figure 2b A three-dimensional schematic diagram of axial sampling of a tensile specimen provided by the present invention;

[0055] Figure 3a A schematic diagram of the axial sampling plane of the compression specimen provided by the present invention;

[0056] Figure 3b A three-dimensional schematic diagram of axial sampling of a compression specimen provided by the present invention;

[0057] Figure 4a A schematic diagram of the radial sampling plane of the tensile and compression specimens provided by the present invention;

[0058] Figure 4b A three-dimensional schematic diagram of radial sampling of tensile and compression specimens provided by the present invention;

[0059] Figure 5 A schematic diagram of dissolution sample sampling provided by the present invention;

[0060] Figure 6 A schematic diagram of a soluble metal material performance test system provided by the present invention;

[0061] Figure 7 A schematic diagram of a soluble metal material dissolution test device provided by the present invention;

[0062] Figure 8 A schematic diagram of a curve showing the test results of mechanical properties of materials under different temperature conditions provided in Example 1 of the present invention;

[0063] Fig. 9 A schematic diagram of the test results of mechanical properties of materials under different sampling directions provided in Example 2 of the present invention;

[0064] Fig.10 A schematic diagram of a curve showing the relationship between the dissolution rate of a soluble metal material and time provided in Example 3 of the present invention;

[0066] 1. Axial tensile specimen; 2. Axial compression specimen; 3. Radial tensile specimen; 4. Radial compression specimen; 5. Dissolution specimen; 6. Pressure control unit; 61. Control system; 62. Hydraulic source; 7. Temperature control unit; 71. Induction heating system; 72. Temperature measurement module; 73 Pressure gauge; 74. Overflow safety valve; 75. Constant temperature box; 8. Loading device; 81. Hydraulic piston cylinder; 82. Clamping mechanism; 9. Solution compensation unit; 91. Solution tank; 92. Electric circulation pump; 93. Ball valve. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the steps. For example, some steps may be decomposed, while some steps may be combined or partially combined, so the actual execution order may change according to the actual situation.

[0069] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0070] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or sub-modules is not necessarily limited to those steps or sub-modules explicitly listed, but may include other steps or sub-modules not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0071] In order to solve the deficiencies of the prior art, the present invention discloses a method for testing the performance of soluble metal materials. Figure 1 A flow chart of a soluble metal material performance testing method provided by the present invention, such as Figure 1 As shown, the testing method comprises the following steps:

[0072] Step S1, sampling mechanical property test specimens of soluble metal materials, wherein the test specimens include: tensile specimens, compression specimens and dissolution specimens;

[0073] Step S2, performing a mechanical property test on the test sample of the soluble metal material under the first condition, including: mechanical property tests on different materials under two conditions: different temperatures and different temperature liquid immersion;

[0074] Step S3, testing the solubility of the soluble metal material under the second condition, including: testing the solubility of the material in solutions of the same medium and different temperatures; testing the solubility of the material in solutions of the same temperature and different media.

[0075] In step S1 of the present invention, the sampling method for the mechanical property test specimens of the soluble metal material is to take out round rod-shaped tensile specimens, cylindrical compression specimens and rectangular dissolution specimens in different directions and positions of the extruded soluble metal original bar. Figure 2a-2b A schematic diagram of axial sampling of a tensile specimen provided by the present invention, Figure 3a-3b A schematic diagram of axial sampling of a compression specimen provided by the present invention, Figure 4a-4b The schematic diagram of radial sampling of tensile and compression specimens provided by the present invention is shown in the figure, wherein the tensile specimen is sampled at three different axial positions of R / 4, R / 2, and 3R / 4 of the bar, and the compression specimen is sampled at the radial R / 2 position of the bar. The diameter d of the round rod of the tensile specimen is usually selected to be 5-10mm, and the length is selected to be 10-15 times of the diameter. A chuck or an external thread section is left at both ends of the round rod of the tensile specimen for connection with the supporting tooling of the test system to ensure that the specimen can be firmly clamped or reliably fixed during the test, avoiding the influence of the experimental results due to the unreliable clamping or connection. For the compression specimen, a shorter round rod (cylinder) can be selected. Usually, the diameter d of the compression specimen is selected to be 10-20mm, and the specimen length is selected to be 1-3 times of the diameter. Figure 5 The schematic diagram of dissolution sample sampling provided by the present invention is as follows: Figure 5 As shown, the dissolution test does not need to consider the difference between axial and radial directions, and samples are uniformly taken at two different axial positions, R / 2 and 3R / 4. Usually, before sampling the soluble metal material, the metal bar needs to be ultrasonically inspected to ensure that the metal bar itself has no cracks, defects, etc. After sampling the soluble metal material, mechanical property tests and dissolution performance tests are carried out respectively.

[0076] In step S2 of the present invention, the mechanical property testing method of soluble metal materials mainly includes: tensile and compressive mechanical property testing of different materials under two conditions: different temperatures and different temperature liquid immersion; wherein the tensile test mainly tests the tensile strength, plastic extension strength, elongation after fracture, cross-sectional shrinkage, etc. of the material, and the compression test mainly measures the yield strength, plastic compression strength, elastic modulus, etc. of the material. Due to the different application environments and working conditions of fracturing tools, the soluble metal materials must first meet the necessary mechanical properties to ensure stable tool pressure-bearing performance, and the mechanical properties of different soluble metal materials under different conditions are different and unstable. In addition, casing deformation frequently occurs in horizontal wells in shale gas, shale oil and other blocks during hydraulic fracturing. The same casing requires a series of bridge plugs with different outer diameters. The performance requirements of small-sized bridge plugs for metal materials also become higher, which increases the difficulty of material selection. By testing and mastering the comprehensive mechanical properties of materials, it is helpful to improve the understanding of materials, improve the matching of materials, and meet the needs of specific working conditions in different regions. Therefore, the test temperature needs to be selected in combination with the formation and wellbore conditions of wells in different regions, and the performance test of the material should be carried out based on the actual working conditions. Usually, the range of different temperatures can be selected from 25°C to 175°C, preferably 25°C, 50°C, 80°C, 95°C, 125°C, 150°C, 175°C, etc. In terms of chloride ion concentration, the concentration of the liquid is selected from 500ppm to 15000ppm, preferably 500ppm, 1000ppm, 2500ppm, 5000ppm, 10000ppm, 15000ppm, or expressed as the mass fraction of potassium chloride KCl and sodium chloride NaCl content, ranging from 0.1% to 3.0%, preferably 0.1%, 0.2%, 0.5%, 1%, 2%, 3%, so as to optimize and improve the test platform. In addition, the working environment of the soluble bridge plug for fracturing is usually to be sealed and pressure-bearing in a wellbore filled with liquid at a certain temperature. In the actual construction process, it is sealed first and then pressure-bearing, or it needs to be lowered into the bottom of the well the day before and then constructed the next day. Therefore, the soluble bridge plug needs to be immersed in a liquid at a certain temperature for a certain period of time to ensure a certain strength and pressure-bearing capacity. Conventional material heating performance tests usually use a heating oven to heat up the temperature, and the whole is in a dry environment. Therefore, combined with the actual working conditions, the material performance test method proposes a mechanical performance test after immersion in liquids of different temperatures for a certain period of time. After the test, the test results of the two test methods of different temperatures and different temperature liquid immersion are compared and analyzed.

[0077] In step S3 of the present invention, the solubility performance test method of soluble metal materials is mainly divided into: material solubility performance test in solutions of the same medium and different temperatures; material solubility performance test in solutions of the same temperature and different media. Since there are large differences in the dissolution rate and dissolution law of soluble metal materials in liquids of different temperatures, different mineralizations, pH values, etc., and the formation temperature, wellbore conditions, construction processes and dissolution requirements in different regions are all different, different requirements are put forward for the dissolution rate and dissolution time control of soluble metal materials; it is necessary to simulate the actual conditions in different regions, carry out solubility performance tests and analyses of different materials, master their dissolution laws, and provide data references for the optimization and selection of soluble metal materials. The dissolution process of magnesium-aluminum alloy materials as the main soluble metal materials is mainly that magnesium-aluminum alloys undergo electrochemical corrosion in liquids with a certain mineralization (chloride ion concentration, unit ppm) and are in a dissolved state. The concentration of the solution is usually selected from 1000ppm to 10000ppm, preferably 500ppm, 1000ppm, 2500ppm, 5000ppm, 10000ppm, 15000ppm, or expressed as the mass fraction of potassium chloride KCl or sodium chloride NaCl content, ranging from 0.1% to 3.0%, preferably 0.1%, 0.2%, 0.5%, 1%, 2%, 3.0%. The temperature range is selected from 25℃ to 175℃, preferably 25℃, 50℃, 80℃, 95℃, 125℃, 150℃, 175℃, etc. Then, different solution concentrations and different temperatures are selected for combination to carry out the dissolution performance test of the sample. During the dissolution test, the sample is weighed at a certain interval to obtain the weight-time relationship curve, and then the dissolution rate of different soluble metal materials under different conditions is calculated.

[0078] Based on the performance test data of soluble materials under different conditions, the comprehensive performance and laws of the materials are summarized, and the performance comparison analysis of different materials under different conditions is carried out to explore the optimal combination of the best mechanical properties and solubility properties, that is, to optimize the overall solubility performance under the premise of ensuring that the mechanical properties meet the actual application and working conditions, and obtain the best dissolution rate and dissolution time, so as to form a selection method for optimizing the soluble materials under different conditions and improving the matching of working conditions. Finally, the materials after the optimal combination are tested, evaluated and verified under specific working conditions.

[0079] Based on the above test method, the present invention also discloses a soluble metal material performance test system. Figure 6 A schematic diagram of a soluble metal material performance test system provided by the present invention, such as Figure 6 As shown, the test system includes: a pressure control unit 6, a temperature control unit 7, a loading device 8 and a solution compensation unit 9; wherein,

[0080] The pressure control unit 6 includes: a control system 61 and a hydraulic source 62. The control system 61 controls the hydraulic source 62, adjusts the pressure change and the circulation of the hydraulic oil, and acts on the loading device 8, so as to accurately control the axial loading force and loading speed, and can adjust and lock the state in time; it can also automatically identify and record the numerical relationship between the loading force, stroke, and time, and draw a curve.

[0081] The loading device 8 is the actuator of the test system, which is used to clamp or place the tensile and compressive specimens. Its overall design is to fix the specimens and continuously stretch or compress them, and to ensure that the specimens are always in a constant temperature environment or immersed in a liquid at a certain temperature. It is mainly composed of a hydraulic piston cylinder 81 and a clamping mechanism 82, wherein the hydraulic piston cylinder 81 generates an axial load and controls the direction of movement through the pressure input by the control system 61 and the hydraulic source 62; the clamping mechanism 82 is composed of a group of symmetrically distributed fixed clamps, and threads and jaws can be set in the fixed clamps to increase friction resistance and ensure a certain clamping force.

[0082] The temperature control unit 7 is the execution unit of the temperature control and adjustment of the test system. It mainly includes an induction heating system 71, a temperature measurement module 72, a pressure gauge 73, an overflow safety valve 74, a thermostat 75, etc. Among them, the induction heating system 71 is mainly used to set and control the heating temperature, and adjust it in time according to the temperature range. The temperature measurement module 72 is mainly used to measure the temperature on the surface and in the cavity of the thermostat 75, and feed it back to the induction heating system 71 in time, to assist the induction heating system 71 in adjusting and controlling the heating temperature. The temperature measurement module 72 is initially equipped with two temperature sensors, both of which can use high-precision thermal resistance temperature sensors. The patch temperature sensor is tightly attached to the outer surface of the thermostat 75, and the other sensor is connected to the cavity of the thermostat 75. The temperature control will be based on the temperature monitored and fed back by the sensor in the cavity of the thermostat 75. The number of sensors can be increased as needed. When conducting mechanical property tests at different temperatures, no liquid or solution is added to the constant temperature box 75. However, when conducting mechanical property tests under different temperature immersion conditions, the constant temperature box 75 needs to be filled with liquid or solution. The liquid or solution is pumped in or discharged through the solution compensation unit 9, and the solution can be replenished in time. In addition, a pressure gauge 73 and an overflow safety valve 74 are provided on the upper part of the thermostatic box 75. The heating temperature of the thermostatic box 75 is controlled by the set temperature of the induction heating system 71 on the one hand, and is also affected by the pressure of the cavity in the thermostatic box 75. The pressure value is adjusted by the overflow safety valve 74 to heat the solution in the cavity to the specified temperature (if the final heating temperature of the solution is set to 120°C, the overflow pressure of the overflow safety valve 74 should be adjusted to 0.2MPa to ensure that the pressure in the outer cylinder cavity is a constant pressure of 0.2MPa; if the final heating temperature of the solution is set to 150°C, the overflow pressure of the overflow safety valve 74 should be adjusted to 0.5MPa to ensure that the pressure in the outer cylinder cavity is a constant pressure of 0.5MPa).

[0083] The solution compensation unit 9 is mainly composed of a solution tank 91, an electric circulation pump 92, a ball valve 93, and an injection pipeline, wherein ball valves 93 are provided at the upper and lower ends of the constant temperature box 75, which are mainly used to inject, discharge, and timely compensate liquid or solution into the inner cavity of the constant temperature box 75; the injection pipeline connects the various components to establish an injection channel for the liquid or solution.

[0084] The test system also includes a dissolution test device, Figure 7 Schematic diagram of the soluble metal material dissolution test device of the present invention, as shown in Figure 7As shown, the dissolution test device mainly includes: a constant temperature water bath heater and a solution vessel. The constant temperature water bath heater is mainly used to heat the solution vessel or the solution and maintain a constant temperature. The constant temperature water bath heater itself has a solution storage cavity. The solution in the storage cavity can be directly heated. The dissolved sample is placed in a square filter basket and immersed in a solution of a certain temperature for dissolution testing. It is also possible to place several solution vessels, place the dissolved sample at the bottom of the dissolution vessel, fill it with solution, and then heat the solution vessel separately at different temperatures for dissolution testing.

[0085] Example:

[0086] According to the above experimental methods, we conducted targeted material testing experiments:

[0087] Example 1: Tensile tests were performed on the same material at different temperatures.

[0088] Figure 8 This is a schematic diagram of the test results of the mechanical properties of materials under different temperature conditions provided in Example 1 of the present invention. The experimental data are as follows: Figure 8 As shown in the figure, it can be seen that the tensile strength and elongation of the same material at different temperatures are completely different, and it can be clearly analyzed that when the temperature increases, the tensile strength becomes lower, and when the elongation increases to a certain extent, it gradually decreases with the increase of temperature, and the elongation is the largest at 150°C. In summary, this material is more suitable for well conditions with high temperatures.

[0089] Example 2: Tensile and compression tests at different temperatures are performed on radial 1 / 2R sampling tensile specimens, axial 1 / 2R sampling tensile specimens, axial 1 / 2R sampling compression specimens, and radial 1 / 2R sampling compression specimens of the same material.

[0090] Fig. 9 Schematic diagram of the test results of mechanical properties of materials under different sampling directions provided in Example 2 of the present invention. The test analysis results are as follows Fig. 9 As shown in the figure, it can be seen that the tensile strength of the axial 1 / 2R sampling of this material is generally better than the tensile strength of the radial 1 / 2R sampling, and the yield strength is also better for the axial 1 / 2R sampling than for the radial 1 / 2R sampling. And all the same sampling samples have a gradually decreasing strength with the increase of temperature, and the strength change trend is basically the same. The elongation after fracture of the axial 1 / 2R sampling is better than the elongation after fracture of the radial 1 / 2R sampling. The change trend is that the elongation after fracture gradually increases with the increase of temperature, but the increase rates of the two are different.

[0091] Example 3: A dissolution experiment was conducted on a certain material, and the process was regularly recorded and counted, and the dissolution rate in different time periods was calculated. Fig.10The relationship between the dissolution rate of the soluble metal material and time provided in Example 3 of the present invention is shown in FIG. Fig.10 As shown in the figure, we can see that as the dissolution time increases, the dissolution rate gradually decreases, and the curve tends to gradually slow down.

[0092] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for testing the performance of soluble metal materials, characterized in that: The method comprises the following steps: Sampling the mechanical property test specimens of the soluble metal material; the test specimens include: tensile specimens, compression specimens and dissolution specimens; Performing a mechanical property test on a test specimen of the soluble metal material under a first condition; The dissolution performance test is performed on the test sample of the soluble metal material under the second condition.

2. The method for testing the performance of soluble metal materials according to claim 1, characterized in that: The tensile test specimens are sampled at three different axial positions of R / 4, R / 2 and 3R / 4 of the bar; The compression test specimen is sampled at the radial R / 2 position of the bar; The dissolution samples are sampled at two different axial positions R / 2 and 3R / 4; wherein, The tensile test specimen is in the shape of a round rod, with a diameter of 5-10 mm and a length of 10-15 times the diameter; The compression specimen is in the shape of a round rod, with a diameter of 10-20 mm and a length of 1-3 times the diameter.

3. The method for testing the performance of soluble metal materials according to claim 1, characterized in that: The first condition includes: testing the mechanical properties of different materials under two conditions: different temperatures and different temperature liquid immersion; wherein, The range of the different temperatures is 25°C to 175°C; The concentration of the liquid at different temperatures is in the range of 500ppm to 15000ppm in terms of chloride ion concentration; or Calculated by mass fraction of potassium chloride or sodium chloride, the range is 0.1% to 3.0%.

4. The method for testing the performance of soluble metal materials according to claim 3, characterized in that: The mechanical properties test includes: tensile test and compression test; wherein, Tensile test is used to test the tensile strength, plastic extension strength, elongation after fracture and section shrinkage of materials; Compression testing is used to measure the yield strength, plastic compressive strength and elastic modulus of a material.

5. The method for testing the performance of soluble metal materials according to claim 1, characterized in that: The second condition includes: a material solubility test in a solution of the same medium and different temperatures; a material solubility test in a solution of the same temperature and different media, wherein: The different temperatures range from 25°C to 175°C; The different media have a concentration of chloride ions ranging from 500ppm to 15000ppm; or, Calculated by mass fraction of potassium chloride or sodium chloride, the range is 0.1% to 3.0%.

6. A soluble metal material performance test system, the test system is used to implement the test method according to any one of claims 1 to 5, characterized in that: The system comprises: a pressure control unit (6), a temperature control unit (7), a loading device (8) and a solution compensation unit (9); wherein: The pressure control unit (6) is connected to the loading device (8) via a hydraulic pipeline; The temperature control unit (7) is connected to the loading device (8) via a wire; The solution compensation unit (9) is connected to the temperature control unit (7) via a liquid injection pipeline; The loading device (8) generates an axial load and controls the direction of movement through the pressure input by the pressure control unit (6); The temperature control unit (7) is used to adjust and control the heating temperature; The solution compensation unit (9) is used to inject, drain or compensate liquid or solution into the temperature control unit (7).

7. The soluble metal material performance testing system according to claim 6, characterized in that: The pressure control unit (6) comprises: a control system (61) and a hydraulic source (62); wherein: The control system (61) and the hydraulic source (62) are connected via a wire.

8. The soluble metal material performance testing system according to claim 6, characterized in that: The temperature control unit (7) comprises: an induction heating system (71), a temperature measurement module (72), a pressure gauge (73), an overflow safety valve (74) and a constant temperature box (75); wherein: The induction heating system (71) and the temperature measurement module (72) are connected via a wire; The temperature measurement module (72) is provided with a plurality of temperature sensors, some of which are arranged on the outer surface of the thermostatic box (75), and some of which are arranged in the cavity of the thermostatic box (75); The pressure gauge (73) and the overflow safety valve (74) are arranged on the upper part of the thermostatic box (75).

9. The soluble metal material performance testing system according to claim 6, characterized in that: The loading device (8) comprises: a hydraulic piston cylinder (81) and a clamping mechanism (82), wherein: The hydraulic piston cylinder (81) is directly connected to the clamping mechanism (82), which is composed of a group of symmetrically distributed fixing clamps and is arranged in the cavity of the thermostatic box (75) of the temperature control unit (7).

10. The soluble metal material performance testing system according to claim 6, characterized in that: The solution compensation unit (9) comprises: a solution tank (91), an electric circulation pump (92), a ball valve (93), and a liquid injection pipeline, wherein: The solution tank (91) is connected to the electric circulation pump (92) via a liquid injection pipeline; the electric circulation pump (92) is connected to the thermostatic box (75) of the temperature control unit (7) via the liquid injection pipeline, and ball valves (93) are provided at the upper and lower ends of the thermostatic box (75).

Images