Pressurizing and heating testing device
By designing a pressurization and heating test device, the problem of large errors in the test results of the interaction parameters between fracturing fluid and coal and rock was solved. Precise control of temperature and pressure was achieved, accurate test data was provided, and the reliability and accuracy of fracturing fluid testing were improved.
Patent Information
- Application Number
- CN202522147657.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-11
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-10-11
AI Technical Summary
Existing tests for the interaction parameters between fracturing fluid and coal/rock have significant errors in the test results, and cannot simultaneously and accurately control temperature and pressure, leading to inaccurate test results.
A pressurization and heating test device is designed, which uses a cylindrical cylinder made of high-strength alloy steel, with an adjustable pressure moving piston and resistance heating wire inside. Combined with multiple heating controllers and temperature sensors, it can achieve precise control and detection of temperature and pressure.
It enables precise testing of the interaction between fracturing fluid and coal rock, provides accurate temperature and pressure data, reduces energy consumption, and improves the reliability and accuracy of the test.
Smart Images
Figure CN223597649U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to fracturing fluid test technical field, especially in kind of pressurization temperature rise testing device. BACKGROUND
[0002] In the field of coal mining and related energy development, fracturing technology is a very critical and widely used means. By injecting fracturing fluid into the coal seam, the permeability of the coal seam can be improved, the desorption and migration of coalbed methane can be promoted, and the recovery rate of coalbed methane can be improved, which is of great significance to energy supply and sustainable development of energy industry.
[0003] However, during the fracturing operation, the interaction between the fracturing fluid and the coal rock is extremely complex. The fracturing fluid not only changes the physical and mechanical properties of the coal rock, but also causes a series of physical and chemical changes in the coal seam, among which the heat release gas phenomenon is particularly significant. This phenomenon is directly related to the production performance and ultimate recovery of coalbed methane wells. Accurate understanding of how much the pressure of the coal rock can be raised, how much the temperature can be raised after adding fracturing fluid in a closed space, and the relationship between the effectiveness of the fracturing fluid and the amount of temperature and pressure is crucial for optimizing fracturing process parameters and improving fracturing effect. At present, although there are some devices on the market for testing related parameters of coal rock and fracturing fluid, most of them have single function and cannot meet the accurate control and detection of temperature and pressure at the same time, making it difficult to achieve precise adjustment of temperature at different positions, resulting in large test result error and unable to provide accurate and reliable reference for actual fracturing operation. Therefore, the present application provides a pressurization temperature rise testing device to meet the demand. UTILITY MODEL CONTENT
[0004] The technical problem to be solved by the utility model is to provide a pressurization temperature rise testing device to solve the problem of large test result error in the existing interaction parameter test between fracturing fluid and coal rock.
[0005] To solve the above technical problems, the utility model provides the following technical scheme:
[0006] A pressurization temperature rise testing device, comprising a cylinder body, the bottom end of the cylinder body is provided with a plugging plate, an adjustable pressure dynamic piston is arranged at the top end of the inside of the cylinder body, the inside of the cylinder body is provided with a coal rock block, a feed pipe is arranged at the top end of the side wall of the cylinder body for adding fracturing fluid into the cylinder body, resistance heating wires are wound outside the cylinder body for heating the cylinder body, and a temperature sensor and a pressure sensor are further arranged outside the cylinder body for detecting the temperature and pressure inside the cylinder body.
[0007] Optionally, a pressure rod is connected to the top of the dynamic piston, the top end of the pressure rod extends out of the cylinder body and is connected with a pressure disc.
[0008] Optionally, the inner bottom of the cylinder is provided with a fixed piston fixed on the sealing plate.
[0009] Optionally, the resistance heating wire is made of nickel-chromium alloy material, and the winding density is 10-25 turns / cm.
[0010] Optionally, the outer side of the cylinder is wrapped with a ceramic sheet, and the outer side of the ceramic sheet is wrapped with a shell, the shell is composed of multiple segments, the end of each two adjacent segments is provided with an ear, and a connecting screw is threadedly connected between the pair of ears.
[0011] Optionally, the cylinder is a cylindrical core holder made of high-strength alloy steel, the annular pressure chamber is formed between the fixed piston and the movable piston, the sealing pressure range of the annular pressure chamber is 0-60 MPa, and the coal rock block is located in the annular pressure chamber.
[0012] Optionally, the ceramic sheet and the shell have a filling layer therebetween, and the filling layer is made of rock wool.
[0013] Optionally, a groove is formed around the outer side wall of the cylinder, and the resistance heating wire is embedded in the groove.
[0014] Optionally, the heating power range of the resistance heating wire is 0-6 kW, a plurality of heating controllers for controlling the resistance heating wire are arranged on the outer side of the cylinder, the plurality of heating controllers are distributed along the height direction of the cylinder, the plurality of heating controllers control the resistance heating wire in sections, the temperature control accuracy of the heating controller is ±0.5℃, and a plurality of temperature sensors are also arranged along the height direction of the cylinder.
[0015] Optionally, the top end of the cylinder is provided with a fixed ring plate, the middle section of the outer side of the cylinder is provided with a center ring plate, a plurality of pull rods are arranged between the sealing plate, the center ring plate and the fixed ring plate, the plurality of pull rods are uniformly distributed around the cylinder, a clamping groove is formed in the lower surface of the sealing plate, a stop block embedded in the clamping groove is connected to the bottom end of the pull rod, and a nut abutting against the fixed ring plate is arranged at the top end of the pull rod.
[0016] Compared with the prior art, the utility model has at least the following beneficial effects:
[0017] In the above scheme, the resistance heating wire is controlled and heated in sections by the plurality of heating controllers, the temperature control accuracy can reach ±0.5℃, the heating temperature in the cylinder can be accurately controlled, and the requirement for temperature under different test conditions can be met. Meanwhile, the movable piston can adjust the pressure, the sealing pressure range of the annular pressure chamber is 0-60 MPa, the test under different pressure conditions can be realized, and an accurate test environment is provided for studying the effect of fracturing fluid on coal rock blocks under different temperatures and pressures.
[0018] By arranging multiple temperature sensors along the height direction of the cylinder, the temperature changes at different positions inside the cylinder can be detected in real time, and the temperature distribution of the coal rock and the fracturing fluid during the heating process can be comprehensively understood. At the same time, the pressure sensor can accurately detect the pressure change inside the cylinder, and by analyzing the temperature and pressure data, the effectiveness of the fracturing fluid and the relationship between the amount of the fracturing fluid and the temperature and pressure can be deeply studied, thereby providing a scientific basis for the selection and use of the fracturing fluid.
[0019] By wrapping the ceramic sheet outside the cylinder, and using rock wool material for the filling layer between the ceramic sheet and the shell, the heat insulation performance is good, heat loss can be effectively reduced, heating efficiency can be improved, and energy consumption can be reduced. BRIEF DESCRIPTION OF DRAWINGS
[0020] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the present application and, together with the description, further serve to explain the principles of the present application and to enable a person skilled in the relevant art to implement and use the present application.
[0021] Figure 1 is a schematic diagram of the three-dimensional structure of the pressurization and temperature increase testing device;
[0022] Figure 2 is a schematic diagram of the internal structure of the pressurization and temperature increase testing device;
[0023] Figure 3 is Figure 1 is an enlarged view of A in FIG. 1;
[0024] Figure 4 is Figure 2 is an enlarged view of B in FIG. 1;
[0025] Figure 5 is Figure 2 is an enlarged view of C in FIG. 1.
[0026] REFERENCE NUMERALS:
[0027] 1, cylinder; 2, plugging plate; 3, pressure rod; 4, pressure disc; 5, heating controller; 6, temperature sensor; 7, pressure sensor; 8, feeding pipe; 9, center ring plate; 10, fixed ring plate; 11, pull rod; 12, fixed piston; 13, coal rock; 14, movable piston; 15, shell; 16, ear piece; 17, connecting screw; 18, ceramic sheet; 19, filling layer; 20, groove; 21, resistance heating wire; 22, clamping groove; 23, stop block.
[0028] As shown in the drawings, in order to clearly realize the structure of the embodiment of the utility model, specific structures and devices are marked in the drawings, but this is only for the need of illustration, and is not intended to limit the utility model in the specific structure, device and environment, and the ordinary skilled in the art can adjust or modify these devices and environment according to specific needs. DETAILED DESCRIPTION
[0029] The utility model provides a kind of pressurization temperature test device provided in the following in combination with drawing and specific embodiment is described in detail.Meanwhile, it is explained here that, in order to make embodiment more detailed, the following embodiment is best, preferred embodiment, and some public technical personnel can also be implemented using other alternative ways;And part of drawing is only for more specific description of embodiment, and is not intended to be specific to the utility model.
[0030] It should be noted that in the specification, "one embodiment", "embodiment", "exemplary embodiment", "some embodiments" and the like indicate that the described embodiment can include specific features, structures or characteristics, but not necessarily every embodiment includes the specific features, structures or characteristics.In addition, when describing specific features, structures or characteristics in combination with embodiments, it should be within the knowledge of the skilled in the art to realize such features, structures or characteristics in combination with other embodiments (whether or not explicitly described).
[0031] Generally, the term can be understood at least partly from the use in context.For example, depending at least partly on context, the term "one or more" used herein can be used to describe any feature, structure or characteristic in singular sense, or can be used to describe combination of features, structures or characteristics in plural sense.In addition, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but can instead, depending at least partly on context, allow the existence of other factors not necessarily explicitly described.
[0032] It can be understood that the meaning of "on", "above" and "above" in the utility model should be interpreted in the broadest way, so that "on" not only means "directly on" something, but also includes the meaning of "on" something with intervening characteristics or layers, and "above" or "above" not only means "above" or "above" something, but also can include the meaning of "above" or "above" something without intervening characteristics or layers.
[0033] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.
[0034] like Figures 1-2 As shown, an embodiment of this utility model provides a pressurization and heating testing device, mainly used for testing the performance of fracturing fluid after adding it into a confined space. It includes a cylinder 1, which is made of high-strength alloy steel and is cylindrical. The bottom of the cylinder 1 is sealed by a sealing plate 2, which fits tightly with the cylinder 1 to ensure good sealing. An adjustable pressure piston 14 is installed at the top of the cylinder 1. A pressure rod 3 is connected to the top of the piston 14, and the top of the pressure rod 3 extends out of the cylinder 1 and is connected to a pressure plate 4. A hydraulic device or other power mechanism acts on the pressure plate 4, causing the pressure rod 3 and the piston 14 to move up and down.
[0035] like Figures 1-2 As shown, a fixed piston 12 is arranged at the bottom of the cylinder 1. The fixed piston 12 is fixed on the sealing plate 2. An annular pressure chamber is formed between the moving piston 14 and the fixed piston 12. The sealing pressure range of the annular pressure chamber is 0 to 60 MPa. The coal and rock block 13 used for testing is located in the annular pressure chamber.
[0036] like Figure 1 , Figure 2 and Figure 4 As shown, a resistance heating wire 21 is wound around the outside of the cylinder body 1. A groove 20 is formed around the outer wall of the cylinder body 1. The resistance heating wire 21 is made of nickel-chromium alloy, with a winding density of 10-25 turns / cm, and is embedded in the groove 20 for heating the cylinder body 1. The heating power range of the resistance heating wire 21 is 0-6kW. Multiple heating controllers 5 are mounted on the outside of the cylinder body 1, distributed along the height direction of the cylinder body 1, which can control the heating of the resistance heating wire 21 in segments. The temperature control accuracy of the heating controllers 5 is ±0.5℃.
[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the cylinder body 1 is externally wrapped with ceramic pieces 18, the ceramic pieces 18 are externally wrapped with an outer shell 15, the outer shell 15 is composed of multiple segments, the end of each two adjacent segments of the outer shell 15 is provided with an ear piece 16, a pair of ear pieces 16 are threadedly connected with a connecting screw 17, and the multiple segments of the outer shell 15 are fixed together through the connecting screw 17. The ceramic pieces 18 and the outer shell 15 are provided with a filling layer 19 therebetween, the filling layer 19 is made of rock wool and plays a role of heat insulation and heat preservation.
[0038] As shown in Figure 1 and Figure 2 , the cylinder body 1 is provided with a feeding pipe 8 at the top end of the side wall, which is used for adding fracturing fluid into the cylinder body 1, and the cylinder body 1 is further provided with a temperature sensor 6 and a pressure sensor 7, and a plurality of temperature sensors 6 are also arranged along the height direction of the cylinder body 1, which are used for detecting the temperature and pressure at different positions inside the cylinder body 1.
[0039] As shown in Figure 1 , Figure 2 and Figure 5 , the cylinder body 1 is provided with a fixed ring plate 10 at the top end, and a center ring plate 9 is arranged at the middle section of the cylinder body 1, a plurality of pull rods 11 are arranged between the plugging plate 2, the center ring plate 9 and the fixed ring plate 10, and the plurality of pull rods 11 are uniformly distributed around the cylinder body 1. The lower surface of the plugging plate 2 is provided with a clamping groove 22, the bottom end of the pull rod 11 is connected with a stop block 23 which is embedded into the clamping groove 22, and the top end of the pull rod 11 is provided with a nut which abuts against the fixed ring plate 10, so that the whole device is fixed through the nut, thereby ensuring the stability of the device during the test.
[0040] The working principle of the technical scheme of the utility model is as follows:
[0041] The hydraulic equipment and other power mechanisms are used to drive the moving piston 14 to move upwards to above the feeding pipe 8, at this time, a certain space is formed inside the cylinder body 1, which is prepared for adding fracturing fluid. The fracturing fluid is added into the cylinder body 1 through the feeding pipe 8, and the fracturing fluid contacts the coal rock block 13 after entering the cylinder body 1. The power mechanism drives the moving piston 14 to below the feeding pipe 8 and then continuously pressurizes, the moving piston 14 moves downwards, the space inside the cylinder body 1 is compressed, the fracturing fluid fully acts on the coal rock block 13, and pressure is generated on the coal rock block 13. The resistance heating wire 21 starts to work, the cylinder body 1 is heated, the heat is transmitted to the coal rock block 13 and the fracturing fluid inside the cylinder body 1 through the cylinder body 1, so that the temperature of them is increased. The plurality of heating controllers 5 can control the heating of the resistance heating wire 21 in sections, the heating temperature at different positions is accurately controlled according to the test requirement. The temperature sensor 6 and the pressure sensor 7 detect the temperature and pressure changes inside the cylinder body 1 in real time, and transmit the data to the external data acquisition and processing system. Through the analysis of these data, it can be concluded that how much the pressure holding pressure can be increased, how much the heating temperature can be increased, and the effectiveness of the fracturing fluid and the relationship between the temperature and the pressure, so that the test of the performance of the fracturing fluid is realized.
[0042] The utility model covers any alternative, modification, equivalent method and scheme which are made on the essence and range of the utility model. In order to make the public have the thorough understanding of the utility model, the specific details are explained in the following preferred embodiment of the utility model, and the utility model can also be completely understood without the description of these details for the person skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the utility model, the well-known method, process, flow, element and circuit etc. are not explained in detail.
[0043] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled person in the art, without departing from the principle of the utility model, a number of improvements and refinements can also be made, and these improvements and refinements should also be regarded as the protection range of the utility model.
Claims
1. A pressurization and heating test device, comprising a cylinder (1), characterized in that: The cylinder (1) has a sealing plate (2) at the bottom end, and an adjustable pressure moving piston (14) is configured at the top inside the cylinder (1). The cylinder (1) is filled with coal and rock blocks (13). The top of the side wall of the cylinder (1) is provided with a feed pipe (8) for adding fracturing fluid into the cylinder (1). The cylinder (1) is wrapped with a resistance heating wire (21) for heating the cylinder (1). The cylinder (1) is also provided with a temperature sensor (6) and a pressure sensor (7) for detecting the internal temperature and pressure of the cylinder (1).
2. The pressurization and heating test device according to claim 1, characterized in that, The top of the moving piston (14) is connected to a pressure rod (3), the top of the pressure rod (3) extends out of the cylinder (1) and is connected to a pressure plate (4).
3. The pressurization and heating test device according to claim 1, characterized in that, A fixed piston (12) is disposed at the bottom of the cylinder (1), and the fixed piston (12) is fixed on the sealing plate (2).
4. The pressurization and heating test device according to claim 1, characterized in that, The resistance heating wire (21) is made of nickel-chromium alloy and has a winding density of 10 to 25 turns / cm.
5. The pressurization and heating test device according to claim 1, characterized in that, The cylinder body (1) is covered with a ceramic sheet (18), and the ceramic sheet (18) is covered with a shell (15). The shell (15) is composed of multiple segments, and each end of an adjacent shell (15) is provided with an ear piece (16). A connecting screw (17) is threaded between a pair of ear pieces (16).
6. The pressurization and heating test device according to claim 3, characterized in that, The cylinder (1) is a cylindrical core holder made of high-strength alloy steel. An annular pressure chamber is formed between the fixed piston (12) and the moving piston (14). The sealing pressure range of the annular pressure chamber is 0 to 60 MPa. The coal and rock block (13) is located in the annular pressure chamber.
7. The pressurization and heating test device according to claim 5, characterized in that, There is a filling layer (19) between the ceramic sheet (18) and the outer shell (15), and the filling layer (19) is made of rock wool.
8. The pressurization and heating test device according to claim 1, characterized in that, The cylinder body (1) has a groove (20) around its outer side wall, and the resistance heating wire (21) is embedded in the groove (20).
9. The pressurization and heating test device according to claim 1, characterized in that, The heating power range of the resistance heating wire (21) is 0 to 6 kW. The cylinder (1) is equipped with multiple heating controllers (5) for controlling the heating of the resistance heating wire (21). The multiple heating controllers (5) are distributed along the height direction of the cylinder (1). The multiple heating controllers (5) control the heating of the resistance heating wire (21) in segments. The temperature control accuracy of the heating controllers (5) is ±0.5℃. The temperature sensors (6) are also arranged in multiple ways along the height direction of the cylinder (1).
10. The pressurization and heating test device according to claim 1, characterized in that, The top of the cylinder (1) is provided with a fixed ring plate (10), and the middle section of the outer side of the cylinder (1) is provided with a center ring plate (9). Multiple tie rods (11) are passed through the sealing plate (2), the center ring plate (9), and the fixed ring plate (10). The multiple tie rods (11) are evenly distributed around the cylinder (1). The lower surface of the sealing plate (2) is provided with a slot (22). The bottom end of the tie rod (11) is connected to a stop block (23) embedded in the slot (22). The top end of the tie rod (11) is provided with a nut that abuts against the fixed ring plate (10).