Tight reservoir volume fracturing fracture locking energization simulation device

Abstract

The utility model discloses a tight reservoir volume fracturing crack locking energization simulation device, which comprises an operation rack, a heating groove box and a locking cavity shell, the heating groove box is arranged on the operation rack, a heating wire is arranged on the inner side wall of the heating groove box, the bottom of the locking cavity shell is inserted into the heating groove box, and the locking cavity shell is arranged on the operation rack. A top frame is installed on the operation rack in a supporting mode through stand columns, a hydraulic cylinder is installed on the top frame, the tail end of a piston rod of the hydraulic cylinder extends to the position below the top frame and is fixedly provided with a lifting frame, and a plurality of spring pressure detection pieces are installed at the bottom of the lifting frame. And the bottom of the spring pressure detection piece is connected and provided with a cavity pressure frame through a spring. The device has the beneficial effects that the compression spring is matched with the hydraulic cylinder for pressure simulation, so that a rock sample can be deformed more conveniently, the displacement of the rock sample can be measured more easily through pressure change, the measurement is more accurate, the chamber can be heated, and the sample can be taken out conveniently.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas production simulation devices, in particular to a tight reservoir volume fracturing crack closure energy enhancement simulation device. Background Art

[0002] When exploiting oil and gas in tight reservoirs, it is necessary to inject a large amount of fracturing fluid for energy enhancement. However, the underground reservoir conditions are relatively complex, so a tight reservoir volume fracturing crack closure energy enhancement simulation experiment is usually carried out. In the patent announcement number CN108843297A, a tight reservoir volume fracturing crack closure energy enhancement simulation device and method are introduced. The displacement of the sample during the fracturing process is measured by a displacement sensor, which can only be measured through the displacement monitoring point, and the measurement results at different points are different. The single measurement of the side displacement of the sample has poor accuracy. Secondly, the sample is pressed by a single hydraulic structure, and the displacement effect of the sample during the fracturing process is poor. In addition, the chamber is brushed with resin. After the simulation is completed, the resin hardens and is inconvenient to remove. Utility Model Content

[0003] The purpose of the utility model is to provide a tight reservoir volume fracturing crack closure energy enhancement simulation device in order to solve the above problems.

[0004] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0005] A device for simulating volume fracturing crack closure and energizing of a dense reservoir, comprising an operating bench, a heating tank box and a locking chamber shell, wherein the heating tank box is mounted on the operating bench, a heating wire is arranged on the inner side wall of the heating tank box, the bottom of the locking chamber shell is inserted into the heating tank box, the operating bench is supported by a top frame and a hydraulic cylinder is mounted on the top frame, the piston rod end of the hydraulic cylinder extends to the bottom of the top frame and is fixedly mounted with a lifting frame, a plurality of spring pressure detection parts are mounted on the bottom of the lifting frame, a chamber pressure frame is mounted on the bottom of the spring pressure detection part through a spring connection, the spring pressure detection part is composed of a sensor frame, a pressure sensor and a spring slide, a pressure sensor is mounted on the bottom of the sensor frame, a limit slide is slidably inserted on the spring slide, the top end of the limit slide is fixedly mounted on the operating bench, and a limit stopper is mounted on the bottom end of the limit slide.

[0006] Furthermore, a liquid inlet pipe is provided above the locking chamber shell, liquid discharge pipes are installed on both sides of the locking chamber shell, and liquid discharge valves are installed on the liquid discharge pipes.

[0007] Furthermore, a leg frame is installed on the bottom support of the operating platform, a weighing frame is installed on the leg frame, and a liquid receiving tank box is placed on the weighing frame.

[0008] Furthermore, the outer top fixing sleeve of the locking chamber shell is provided with an edge ring.

[0009] Furthermore, a control display is installed on the column.

[0010] The beneficial effects are: the tight reservoir volume fracturing crack closure energization simulation device described in the utility model performs pressure simulation through a plurality of compression springs in cooperation with a hydraulic cylinder, which can make the rock sample more convenient to deform, and the displacement of multiple points can be more easily measured through pressure changes, the measurement is more accurate, and the chamber can be heated to facilitate the removal of samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of a tight reservoir volume fracturing crack closure energy enhancement simulation device described in the utility model;

[0012] Figure 2 It is an enlarged schematic diagram of structure A of a tight reservoir volume fracturing crack closure energization simulation device described in the utility model.

[0013] The following are the descriptions of the reference numerals:

[0014] 1. Operating table; 2. Heating tank box; 3. Locking chamber shell; 4. Column; 5. Top frame; 6. Spring pressure detection component; 61. Sensor frame; 62. Pressure sensor; 63. Limit slide column; 64. Spring slide; 65. Limit stopper; 7. Chamber pressure frame; 8. Lifting frame; 9. Control display; 10. Drain pipe; 11. Drain valve; 12. Leg frame; 13. Weighing frame; 14. Liquid receiving tank box; 15. Along the ring; 16. Liquid inlet pipe; 17. Hydraulic cylinder; 18. Spring. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings:

[0016] like Figure 1-Figure 2 As shown, a tight reservoir volume fracturing crack closure energy enhancement simulation device is composed of an operating platform 1, a heating tank box 2 and a closure chamber shell 3;

[0017] The heating tank box 2 is installed on the operating table 1. A heating wire is provided on the inner side wall of the heating tank box 2, which is used to heat the inside of the box. The bottom of the locking chamber shell 3 is inserted into the heating tank box 2. When performing simulation, a dense reservoir rock sample is placed in the chamber of the locking chamber shell 3, which is provided with cracks and locking points. The method for making the dense reservoir rock sample is a public method in the industry and is not further described here. In order to ensure the sealing during the simulation process, a resin brushing operation is usually performed in the locking chamber shell 3. The heating tank box 2 is used for heating after the experiment is completed, so that the gap between the heating tank box 2 and the locking chamber shell 3 generates heat and is evenly heated, so that the wall is separated, which is convenient for sample removal;

[0018] The operating table 1 is supported by a column 4 and a top frame 5 is installed. A hydraulic cylinder 17 is installed on the top frame 5. The piston rod end of the hydraulic cylinder 17 extends to the bottom of the top frame 5 and is fixedly installed with a lifting frame 8. A plurality of spring pressure detection parts 6 are installed at the bottom of the lifting frame 8. The bottom of the spring pressure detection part 6 is connected to a chamber pressure frame 7 through a spring 18. The chamber pressure frame 7 is used to be pressed onto the dense reservoir rock sample to apply a quantitative pressure to simulate the bottom pressure. During the pressing process, the spring 18 is gradually compressed and stops after reaching the specified pressure. When performing the locking energization experiment, the spring 18 will be subjected to secondary extrusion to undergo a small displacement deformation. The deformation amount can be used to judge the displacement amount, which is obtained by calculating the elastic force change.

[0019] like Figure 1-Figure 2 As shown, the utility model also discloses the following more optimized specific structures:

[0020] The spring pressure detection component 6 is composed of a sensor frame 61, a pressure sensor 62 and a spring slide 64. The spring slide 64 is arranged below the sensor frame 61. The pressure sensor 62 is installed at the bottom of the sensor frame 61. The spring slide 64 is pressed onto the pressure sensor 62 under the top pressure of the spring to achieve pressure measurement. A limit slide 63 is slidably inserted on the spring slide 64. The top end of the limit slide 63 is fixedly installed on the operating table 1, and the bottom end of the limit slide 63 is installed with a limit stop body 65.

[0021] A liquid inlet pipe 16 is provided above the locking chamber shell 3 , which does not hinder the operation of the chamber press frame 7 . Liquid discharge pipes 10 are installed on both sides of the locking chamber shell 3 , and liquid discharge valves 11 are installed on the liquid discharge pipes 10 .

[0022] The bottom support of the operating table 1 is equipped with a leg frame 12, and a weighing frame 13 is installed on the leg frame 12. The weighing frame 13 is an existing commonly used weighing structure, and a pressure sensor is provided on it, which will not be further described here. A liquid collecting tank box 14 is placed on the weighing frame 13 for collecting and weighing the discharged liquid.

[0023] Notches are provided on the two side walls of the heating tank box 2 to avoid obstructing the invisibility of the drain pipe 10 . A fixed sleeve on the outer top of the locking chamber shell 3 is provided with an edge ring 15 , which is used to be pressed onto the top groove edge of the locking heating tank box 2 .

[0024] A control display 9 is mounted on the column 4 for displaying the pressing pressure and the weighing weight.

[0025] like Figure 1-Figure 2 The tight reservoir volume fracturing crack closure energy enhancement simulation device shown in the figure obtains the tight reservoir rock sample according to the chamber size of the closure chamber shell 3 before use, and makes a seam through a seam making machine, then brushes resin in the chamber and places the tight reservoir rock sample in the chamber;

[0026] The hydraulic cylinder is started to press the frame downward until the simulated downward pressure reaches the specified pressure. Liquid is fed from the liquid inlet pipe 16 at a certain pressure through an external flushing device. The end of the liquid inlet pipe 16 is inserted into the liquid inlet cavity of the dense reservoir rock sample. During the simulated fracturing process, the top of the dense reservoir rock sample will undergo a certain deformation, driving the spring 18 to undergo a secondary compression. The compression amount is the displacement amount, and the pressure at the liquid inlet and liquid discharge ends of the gap changes, which will also cause the spring pressure detection component 6 at different positions to detect different pressures, making the collected data more accurate.

[0027] Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements shall fall within the scope of the present invention to be protected.

Claims

1. A tight reservoir volume fracturing crack closure energy enhancement simulation device, characterized by: The invention comprises an operating table, a heating trough box and a locking chamber shell, wherein the heating trough box is installed on the operating table, a heating wire is provided on the inner side wall of the heating trough box, the bottom of the locking chamber shell is inserted into the heating trough box, the operating table is supported by a top frame and installed with a hydraulic cylinder, the piston rod end of the hydraulic cylinder extends to the bottom of the top frame and is fixedly installed with a lifting frame, a plurality of spring pressure detection parts are installed at the bottom of the lifting frame, the bottom of the spring pressure detection part is connected with a chamber pressure frame through a spring, the spring pressure detection part is composed of a sensor frame, a pressure sensor and a spring slide, the bottom of the sensor frame is installed with a pressure sensor, a limit slide is slidably inserted on the spring slide, the top end of the limit slide is fixedly installed on the operating table, and a limit stopper is installed at the bottom end of the limit slide.

2. A tight reservoir volume fracturing crack closure energization simulation device according to claim 1, characterized in that: A liquid inlet pipe is arranged above the locking chamber shell, liquid discharge pipes are installed on both sides of the locking chamber shell, and liquid discharge valves are installed on the liquid discharge pipes.

3. A tight reservoir volume fracturing crack closure energization simulation device according to claim 1, characterized in that: The bottom support of the operating platform is equipped with a leg frame, a weighing frame is installed on the leg frame, and a liquid receiving tank box is placed on the weighing frame.

4. A tight reservoir volume fracturing crack closure energization simulation device according to claim 1, characterized in that: The outer top fixing sleeve of the locking cavity shell is provided with an edge ring.

5. The device for simulating crack closure and energization of volume fracturing in tight reservoirs according to claim 1, characterized in that: A control display is installed on the column.

Images