CN110243669B - Integrated multifunctional rock mechanical parameter testing experimental device capable of simulating reservoir measure conditions of oil reservoir and working method - Google Patents
Integrated multifunctional rock mechanical parameter testing experimental device capable of simulating reservoir measure conditions of oil reservoir and working method Download PDFInfo
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
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Abstract
The invention relates to an integrated multifunctional rock mechanical parameter testing experimental device capable of simulating oil reservoir measure conditions and a working method thereof, wherein the experimental device comprises a rock core holder, a loading device and a control analysis device; and putting the core into a core cavity, installing all parts of the core holder in place, and loading confining pressure for the core holder according to experimental requirements so as to provide stress for the core. And then, according to an experimental target, testing mechanical parameters of the rock core, and collecting and analyzing the mechanical properties of the rock by using a strain gauge and stress-strain collection computer related software. The invention can realize the test of mechanical parameter performance of various rock samples on the same experimental device, realizes the multiple functions of one machine, does not need to replace experimental equipment and experimental equipment, greatly saves the experimental cost and improves the experimental efficiency. The integrated multifunctional rock mechanical parameter testing experimental device is scientific and reasonable in structural design, convenient to operate and use and accurate and reliable in experimental result.
Description
Technical Field
The invention relates to an integrated multifunctional rock mechanical parameter testing experimental device capable of simulating oil reservoir measure conditions and a working method, and belongs to the technical field of rock mechanical property testing.
Background
The development of the oil and gas industry is not independent of the exploration of human beings on stratum rocks, and the mastering of basic mechanical properties (tensile strength, compressive strength, shear strength, elastic modulus, Poisson ratio and the like) of the stratum rocks is important for the development of oil and gas. Therefore, the testing devices for rock mechanics parameters are endless.
At present, rock mechanical parameter test experimental devices such as a rock tensile strength test experiment, a shear strength test experiment, a compressive strength test experiment, a compression deformation experiment and the like mostly have the following problems: a single rock mechanical parameter testing device can only complete a single testing task, and if a plurality of rock mechanical parameter testing tasks are to be completed, the device needs to be selected according to the type of the rock mechanical parameters to be tested; even if some rock mechanical parameter tests can realize parts in a plurality of projects, such as testing devices capable of realizing tensile strength, uniaxial compression strength and triaxial compression strength of rocks, corresponding clamps and auxiliary tools are also equipped, each test experiment needs to be replaced by a corresponding clamp, and the operation is extremely complicated; of course, there are also students who propose multifunctional rock mechanical property testing machines, but the structure is still complicated, and the needs of integrating reservoir simulation measures and rock mechanical parameter tests cannot be simultaneously completed.
Therefore, in order to explore the integrated test of the basic properties (tensile strength, compressive strength, shear strength, elastic modulus and Poisson ratio) of rock mechanics after the oil reservoir measures are taken for saturated rocks, and comprehensively consider the defects of the current rock mechanics property test testing machine, the invention designs a multifunctional indoor experimental device and a method which are suitable for integrating the tests of the compressive strength, the tensile strength, the shear strength, the compression deformation test and the like of the rock after the measures for the saturated rocks and the oil reservoir, namely a multifunctional rock mechanics parameter test experimental device and a method which can simulate the conditions of the measures for the oil reservoir.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an integrated multifunctional mechanical parameter testing experimental device which can simulate the reservoir measure conditions of an oil reservoir and can respectively carry out mechanical property testing experiments such as rock tensile strength, uniaxial compressive strength, triaxial compressive strength, direct shear strength and the like on one experimental device.
The invention also provides a working method of the integrated multifunctional mechanical parameter testing experimental device for the rock mechanical parameter testing experiment.
The technical scheme of the invention is as follows:
an integrated multifunctional rock mechanical parameter testing experimental device capable of simulating oil reservoir measure conditions comprises a rock core holder, a loading device and a control analysis device;
the core holder comprises a cylinder body, a rubber sleeve is arranged in the cylinder body, a hollow area in the rubber sleeve is a core cavity, and a confining pressure pressurizing port, a confining pressure relief port, an upper loading shaft and a lower loading shaft are arranged on the cylinder body; the left core plug and the right core plug are arranged at two ends of the cylinder body and are respectively connected with the cylinder body in a sealing mode through a left steel cover and a right steel cover, the left core plug comprises a left upper loading shaft and a left lower loading shaft which are arranged in parallel, the left upper loading shaft is provided with a liquid inlet, the right core plug comprises a right upper loading shaft and a right lower loading shaft which are arranged in parallel, the right upper loading shaft is provided with a wire outlet hole, and the right lower loading shaft is provided with a liquid outlet;
the loading device comprises a left hydraulic jack, a right hydraulic jack, an upper loading device and a lower loading device; the left hydraulic jack and the right hydraulic jack have the same structure and comprise an upper pressurizing port, a lower pressurizing port, an upper pressure relief port, a lower pressure relief port, an upper impact shaft and a lower impact shaft; the upper loading device is provided with a fixed loading shaft which is in contact with the upper loading shaft, and the lower loading device is a single-cavity hydraulic jack;
the control analysis device comprises a stress strain acquisition computer, a strain gauge, a hand pump a, a hand pump b, a three-way valve a, a three-way valve b, a three-way valve c and a three-way valve d; the stress-strain acquisition computer is connected with the strain gauge and then is connected into the wire outlet hole; the hand pump a is connected with a port 1 of the three-way valve a, a port 2 of the three-way valve a is connected with a confining pressure pressurizing port on the cylinder body, and a port 3 of the three-way valve a is connected with a pressurizing port of the lower loading device; the hand pump b is connected with the port 1 of the three-way valve b, the port 2 of the three-way valve b is connected with the port 1 of the three-way valve c, and the port 3 of the three-way valve b is connected with the port 1 of the three-way valve d; the interface 2 of the three-way valve c is connected with the upper pressurizing port of the right hydraulic jack, and the interface 3 of the three-way valve c is connected with the lower pressurizing port of the right hydraulic jack; and a port 2 of the three-way valve d is connected with an upper pressurizing port of the left hydraulic jack, and a port 3 of the three-way valve d is connected with a lower pressurizing port of the left hydraulic jack.
Preferably, an upper backing plate and a lower backing plate are arranged between the rubber sleeve and the wall of the cylinder body.
Preferably, the cylinder body is provided with an upper sliding sleeve and a lower sliding sleeve, the upper loading shaft penetrates through the upper sliding sleeve to be in contact with the upper backing plate, and the lower loading shaft penetrates through the lower sliding sleeve to be in contact with the lower backing plate.
Preferably, the single-cavity hydraulic jack comprises a supporting seat, a cavity and a loading shaft, the cavity is arranged on the supporting seat, the loading shaft is arranged in the cavity, and a pressurizing port and a pressure relief port are formed in the cavity.
Preferably, the supporting seat is provided with a bolt hole and fixedly mounted on the ground through a foundation bolt.
Preferably, the left hydraulic jack and the right hydraulic jack are both single-cylinder double-cavity hydraulic jacks, and the upper impact shaft and the lower impact shaft are respectively positioned in the upper cavity and the lower cavity. The advantage of this design lies in, adopts the single cylinder double-cavity hydraulic jack of mutual independent operation, can control upper impact axle and lower impact axle respectively, and then realizes that a quick-witted is multi-functional finally to the independent impact loading operation of core plug upper and lower loading axle respectively of upper impact axle and lower impact axle, realizes multiple experimental mode on this experimental apparatus.
A working method of an integrated multifunctional rock mechanical parameter testing experimental device capable of simulating oil reservoir measure conditions comprises the following steps:
(1) manufacturing a rock core according to experimental requirements;
(2) putting the core into the core cavity, and sealing the core holder;
(3) simulating reservoir measure conditions of the oil reservoir of the core in the core holder through the liquid inlet to prepare an experiment;
(4) starting to test different rock mechanical parameters, wherein when the rock triaxial pseudo-compression strength test is carried out, a confining pressure pressurizing port is opened, and a rock core is loaded with confining pressure by using a hand pump;
(5) starting a strain gauge and a strain acquisition computer and related software, and establishing a new task;
(6) according to different rock mechanical parameter test experiment requirements, a hand-operated pump is used for providing pressure for a left hydraulic jack and/or a right hydraulic jack, so that the left hydraulic jack and/or the right hydraulic jack can impact different core plug loading shafts, and the core can be loaded;
(7) clicking a starting button of software on a stress-strain acquisition computer, and recording the loading change process of the rock core in a stressed state;
(8) ending the experiment until the core is fractured;
(9) stopping software operation, and storing experimental data;
(10) changing the core, and repeating the experimental steps (3) - (9);
(11) and unloading the pressure relief and arranging the experimental equipment, and processing experimental data.
The invention has the beneficial effects that:
1) the integrated multifunctional rock mechanical parameter testing experimental device capable of simulating the oil reservoir measure conditions can simulate the oil reservoir measure conditions through the rock sample holding device and can also perform rock mechanical parameter testing experiments on rock cores before and after the oil reservoir measure conditions (without taking out the rock cores).
2) The integrated multifunctional rock mechanical parameter testing experimental device capable of simulating the oil reservoir measure conditions can realize the testing of mechanical parameter performance of various rock samples after measures on the same experimental device, realizes multiple purposes of one machine, does not need to replace experimental equipment and experimental equipment, greatly saves the experimental cost and improves the experimental efficiency.
3) The integrated multifunctional rock mechanical parameter testing experimental device capable of simulating the oil reservoir measure conditions is unique, scientific and reasonable in structural design, convenient and safe to operate and use, and accurate and reliable in experimental result.
Drawings
FIG. 1 is a schematic diagram of a core holder according to the present disclosure;
FIG. 2a is a schematic structural diagram of a left hydraulic jack in the loading device according to the present invention;
FIG. 2b is a schematic structural diagram of a right hydraulic jack in the loading device according to the present invention;
FIG. 3a is a schematic structural diagram of an upper loading device in the loading device of the present invention;
FIG. 3b is a schematic structural diagram of a lower loading device of the present invention;
FIG. 4 is a schematic view of the loading position of the entire loading apparatus of the present invention;
FIG. 5 is a schematic view of the connection relationship of the whole experimental apparatus according to the present invention;
wherein: 1 cylinder body, 1-1 upper backing plate, 1-2 rubber sleeve, 1-3 annular space, 1-4 upper right loading shaft (core plug), 1-5 wire outlet holes, 1-6 liquid outlet holes, 1-7 lower right loading shaft (core plug), 1-8 right steel cover, 1-9 core cavity, 1-10 lower backing plate, 1-11 lower sliding sleeve, 1-12 lower loading shaft, 1-13 lower sealing cover, 1-14 confining pressure pressurizing port, 1-15 lower left loading shaft (core plug), 1-16 upper left loading shaft (core plug), 1-17 liquid inlet hole, 1-18 left steel cover, 1-19 upper sliding sleeve, 1-20 upper loading shaft, 1-21 confining pressure relief port and 1-22 upper sealing cover; 2 right hydraulic jack, 2-1 right hydraulic jack top pressure relief opening, 2-2 right hydraulic jack upper cavity, 2-3 right hydraulic jack top pressure relief opening, 2-4 right hydraulic jack bottom pressure relief opening, 2-5 right hydraulic jack bottom pressure relief opening, 2-6 right hydraulic jack bottom cavity, 2-7 right hydraulic jack bottom impact shaft, 2-8 right hydraulic jack top impact shaft, 3 bottom hydraulic jack, 3-1 bottom hydraulic jack pressure relief opening, 3-2 support seat, 3-3 bottom hydraulic jack cavity, 3-4 foundation bolt, 3-5 bottom hydraulic jack pressure relief opening, 3-6 bottom hydraulic jack loading shaft; 4 left hydraulic jacks, 4-1 left hydraulic jack upper impact shaft, 4-2 left hydraulic jack lower impact shaft, 4-3 left hydraulic jack lower cavity, 4-4 left hydraulic jack lower pressure relief port, 4-5 left hydraulic jack lower pressure relief port, 4-6 left hydraulic jack upper pressure relief port, 4-7 left hydraulic jack upper pressure relief port, 4-8 left hydraulic jack upper cavity; 5, fixing a loading device, and 5-1 fixing a loading shaft; 6 a strain gauge; 7 stress strain acquisition computer; 8, a hand pump a; the three-way valve comprises a9 three-way valve a, a 1 interface of the 9-1 three-way valve a, a 2 interface of the 9-2 three-way valve a and a 3 interface of the 9-3 three-way valve a; 10 hand pump b; the three-way valve b11, the port 1 of the three-way valve b 11-1, the port 2 of the three-way valve b 11-2 and the port 3 of the three-way valve b 11-3; a 1 port of a 12-three-way valve c, a 12-1 three-way valve c, a 2 port of the 12-2 three-way valve c and a 3 port of the 12-3 three-way valve c; the three-way valve d13, the port 1 of the three-way valve d 13-1, the port 2 of the three-way valve d 13-2 and the port 3 of the three-way valve d 13-3.
Detailed Description
The present invention will be further described by way of examples, but not limited thereto, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1 to 5, this embodiment provides an integrated multifunctional rock mechanical parameter testing experimental apparatus capable of simulating reservoir measures for rock mechanical parameter testing experiments, and the apparatus mainly includes three major parts, namely a core holder, a loading device and a control and analysis device. The core holder is used for placing cores with different characteristics (cores with different characteristics are manufactured according to different rock mechanical parameter experiment requirements), and meanwhile, different measure conditions (realized by water injection and acid injection) of an oil reservoir can be simulated; the loading device is used for providing external force to load the rock sample so that the rock sample is deformed until the rock sample is broken; the control analysis device is used for collecting and analyzing the experimental data of the rock sample under different conditions.
The core holder comprises a cylindrical cylinder body 1, the cylinder body 1 is horizontally and transversely arranged, and two ends of the cylinder body are provided with a left steel cover 1-18, a right steel cover 1-8, a left core plug and a right core plug; the left core plug and the right core plug are respectively divided into an upper part and a lower part which are stacked together, namely a left upper loading shaft 1-16, a left lower loading shaft 1-15, a right upper loading shaft 1-4 and a right lower loading shaft 1-7. A rubber sleeve 1-2 is arranged in the cylinder body 1, and an annular space 1-3 between the rubber sleeve 1-2 and the wall of the cylinder body is provided with an upper backing plate 1-1 and a lower backing plate 1-10. The hollow area in the rubber sleeve 1-2 is a core cavity 1-9, one end of the left core plug and one end of the right core plug are inserted into the rubber sleeve 1-2, and the other end of the left core plug and the other end of the right core plug penetrate through the cylinder body and are assembled through the left steel cover 1-18 and the right steel cover 1-8 and sealed by the left steel cover and the right steel cover. The cylinder body 1 is provided with a confining pressure pressurizing port 1-14, a confining pressure relief port 1-21, an upper sliding sleeve 1-19 and a lower sliding sleeve 1-11. An upper loading shaft 1-20 is arranged in the upper sliding sleeve 1-19 and is sealed by an upper sealing cover 1-22, and a lower loading shaft 1-12 is arranged in the lower sliding sleeve 1-11 and is sealed by a lower sealing cover 1-13. The upper left loading shaft 1-16 is provided with a liquid inlet 1-17, the lower right loading shaft 1-7 is provided with a liquid outlet 1-6, and the upper right loading shaft 1-4 is provided with a wire outlet 1-5 for the strain gauge wiring of the transformer 6.
The loading device comprises a left hydraulic jack 4, a right hydraulic jack 2, an upper fixed loading device 5 and a lower hydraulic jack 3. The left hydraulic jack 4 and the right hydraulic jack 2 have the same structure and are single-cylinder and double-cavity hydraulic jacks. The left hydraulic jack 4 mainly comprises an upper pressurizing port 4-6, an upper pressure relief port 4-7, an upper impacting shaft 4-1, an upper cavity 4-8, a lower pressurizing port 4-5, a lower pressure relief port 4-4, a lower impacting shaft 4-2 and a lower cavity 4-3. The upper fixed loading device 5 is provided with a fixed loading shaft 5-1. The lower hydraulic jack 3 is a single-shaft single-cavity hydraulic jack and mainly comprises a pressurizing port 3-1, a pressure relief port 3-5, a loading shaft 3-6 and a cavity 3-3, wherein the cavity 3-3 is placed on a supporting seat 3-2, and the supporting seat is fixed by foundation bolts 3-4. The upper fixed loading device 5 is matched with the lower hydraulic jack 3 for use.
The control analysis device comprises a strain gauge 6, a stress strain acquisition computer 7, a hand pump a8 and a three-way valve a9, wherein the three-way valve a9 comprises a 1 interface 9-1 of the three-way valve a, a 2 interface 9-2 of the three-way valve a, a 3 interface 9-3 of the three-way valve a, a hand pump b10 and a three-way valve b11, the three-way valve b11 comprises a 1 interface 11-1 of the three-way valve b, a 2 interface 11-2 of the three-way valve b, a 3 interface 11-3 of the three-way valve b and a three-way valve c12, the three-way valve c12 comprises a 1 interface 12-1 of the three-way valve c, a 2 interface 12-2 of the three-way valve c, a 3 interface 12-3 of the three-way valve c and a three-way valve d13, and the three-way valve d13 comprises a 1 interface 13-1 of the three-way valve d, a 2 interface 13-2 of the three-way valve d and a 3 interface 13-3 of the three-way valve d. Wherein, the stress-strain acquisition computer 7 is connected with the strain gauge 6 and then is connected with the wire outlet holes 1-5; the hand pump a8 is connected with the 1 interface 9-1 of the three-way valve a9, the 2 interface 9-2 of the three-way valve a9 is connected with the confining pressure pressurizing port 1-10 on the cylinder body 1, and the 3 interface 9-3 of the three-way valve a9 is connected with the pressurizing port 3-1 of the lower hydraulic jack 3; the hand pump b10 is connected with the 1 interface 11-1 of the three-way valve b11, the 2 interface 11-2 of the three-way valve b11 is connected with the 1 interface 12-1 of the three-way valve c12, and the 3 interface 11-3 of the three-way valve b11 is connected with the 1 interface 13-1 of the three-way valve d 13; a 2 interface 12-2 of the three-way valve c12 is connected with an upper pressurizing port 2-3 of the right hydraulic jack 2, and a 3 interface 12-3 of the three-way valve c12 is connected with a lower pressurizing port 2-4 of the right hydraulic jack 2; the 2 interface 13-2 of the three-way valve d13 is connected with the upper pressurizing port 4-6 of the left hydraulic jack 4, and the 3 interface 13-3 of the three-way valve d13 is connected with the lower pressurizing port 4-5 of the left hydraulic jack 4.
The working principle of the invention is as follows:
the device can be used for carrying out mechanical parameter test experiments on the rock core meeting the experiment requirements, so that the basic rule of the mechanical property of the rock is explored, different oil reservoir conditions can be simulated through the rock core holder, and different oil reservoir conditions can be simulated through water injection or acid injection before the experiments (corresponding liquid is injected through the liquid inlet and is discharged through the liquid outlet). The confining pressure pressurizing port is used for loading confining pressure on the rock core, and the pressurizing liquid is water; the confining pressure relief port is used for unloading confining pressure after the experiment is finished; the rubber sleeve is used for isolating the rock core and liquid water applying confining pressure; the left and right loading shafts (core plugs) have triple functions, are firstly used for plugging the core to provide a channel for a cable, are used as the loading shafts during the test of the compressive strength of the core, and are finally used as the loading shafts during the test of the shear strength of the core by direct shearing of the core, and are divided into an upper part and a lower part to play a role; the upper sliding sleeve and the lower sliding sleeve are used for sealing and providing a sliding channel of the upper loading shaft and the lower loading shaft; the upper and lower loading shafts are used as loading shafts when the tensile strength of the rock is measured and are matched with the upper and lower sliding sleeves for use. The upper and lower base plates are designed according to the Brazilian splitting idea and used for dispersing stress concentration acting on the rock during testing the tensile strength of the rock, directly loading the rock core and testing the tensile strength of the rock core.
Firstly, putting a rock core into a rock core cavity, installing all parts of the rock core holder in place, and loading confining pressure (pseudo-triaxial) for the rock core according to experimental needs to provide triaxial stress for the rock core. And then according to an experimental target, performing oil reservoir measure simulation (water injection or acid injection), finally performing mechanical parameter test on the rock core, and acquiring and analyzing the mechanical property of the rock by using a strain gauge and stress-strain acquisition computer related software.
Example 2:
an experimental method for testing the compressive strength of rock (rock compression deformation experiment) utilizes the experimental device described in embodiment 1, and the specific operation process is as follows:
the compression strength test can be divided into a uniaxial compression strength test and a triaxial (true triaxial and pseudo triaxial) compression strength test, and the experimental device only provides conditions for testing the uniaxial and pseudo triaxial compression strengths.
Uniaxial compressive strength test experiment:
(1) drilling a core according to experimental requirements, and polishing the drilled core for later use;
(2) the attached experimental set-up is shown in FIG. 5. When connecting the equipment, the upper loading shaft 1-20 and the fixed loading shaft 5-1 of the upper fixed loading device 5 are in a critical contact state (no force contact);
(3) putting the core prepared in the step (1) into a core cavity 1-9, sequentially matching a left core plug, a right core plug, a left steel cover 1-18 and a right steel cover 1-8, and assembling the whole core holder to prepare for an experiment;
(4) performing reservoir measure condition simulation (water injection, acid injection and the like) on the core in the core holder cylinder body 1 through the liquid inlets 1-17 to prepare for subsequent experiments;
(5) starting the strain gauge 6 and the strain acquisition computer 7 and related software to establish a new task;
(6) opening all interfaces of a three-way valve b11, a three-way valve c12 and a three-way valve d13, and simultaneously pressurizing a left hydraulic jack 4 and a right hydraulic jack 2 by using a hand-operated pump b10 to ensure that impact shafts of the left and right hydraulic jacks act on left and right core plugs at two ends of the cylinder body 1 under the action of the same force;
(7) starting the experiment, clicking a start button of software on the stress-strain acquisition computer 7, and recording the loading change process of the rock in a stressed state;
(8) ending the experiment until the core is fractured;
(9) stopping software operation, and storing experimental data;
(10) changing the rock core, and repeating the experimental steps (3) - (9) to obtain a plurality of groups of experimental data;
(11) and unloading the pressure relief and arranging the experimental equipment, and processing experimental data.
Simulated triaxial compressive strength test experiment:
(1) drilling a core according to experimental requirements, and polishing the drilled core for later use;
(2) the attached experimental set-up is shown in FIG. 5. When connecting the equipment, the upper loading shaft 1-20 and the fixed loading shaft 5-1 of the upper fixed loading device 5 are in a critical contact state (no force contact);
(3) putting the core into the core cavity 1-9, sequentially matching a left core plug, a right core plug, a left steel cover 1-18 and a right steel cover 1-8, and assembling the whole core holder to prepare for an experiment;
(4) performing reservoir measure condition simulation (water injection, acid injection and the like) on the core in the core holder cylinder body 1 through the liquid inlets 1-17 to prepare for subsequent experiments;
(5) opening a 2 interface 9-2 and a 1 interface 9-1 of a three-way valve a9, closing a 3 interface 9-3, loading confining pressure on a rock core in a rock core cavity 1-9 by using a hand pump a8, and ensuring that the loading confining pressure meets the condition of pseudo-triaxial stress according to experimental requirements;
(6) starting the strain gauge 6 and the strain acquisition computer 7 and related software to establish a new task;
(7) opening all interfaces of a three-way valve b11, a three-way valve c12 and a three-way valve d13, and simultaneously pressurizing a left hydraulic jack 4 and a right hydraulic jack 2 by using a hand-operated pump b10 to ensure that impact shafts of the left and right hydraulic jacks act on left and right core plugs at two ends of the cylinder body 1 under the action of the same force;
(8) starting the experiment, clicking a start button of software on the stress-strain acquisition computer 7, and recording the loading change process of the rock in a stressed state;
(9) ending the experiment until the core is fractured;
(10) stopping software operation, and storing experimental data;
(11) changing the rock core, and repeating the experimental steps (3) - (10) to obtain a plurality of groups of experimental data;
(12) and unloading the pressure relief and arranging the experimental equipment, and processing experimental data.
The strain gauge, the stress-strain acquisition computer and related software are all in the prior art, and the used rock core is manufactured into a corresponding rock sample according to experimental requirements (the rock sample manufacturing process is also in the prior art); corresponding analysis processing is carried out on a plurality of groups of experimental data obtained after the experiment is finished by adopting a conventional means, namely, the subsequent data processing and analyzing process is not the protection scope of the application.
Example 3:
an experimental method for testing tensile strength of rock utilizes the experimental device described in embodiment 1, and the specific operation process is as follows:
(1) drilling a core according to experimental requirements, and polishing the drilled core for later use;
(2) the attached experimental set-up is shown in FIG. 5. When connecting the equipment, the upper loading shaft 1-20 and the fixed loading shaft 5-1 of the upper fixed loading device 5 are in a critical contact state (no force contact);
(3) putting the core into the core cavity 1-9, sequentially matching a left core plug, a right core plug, a left steel cover 1-18 and a right steel cover 1-8, and assembling the whole core holder to prepare for an experiment;
(4) performing reservoir measure condition simulation (water injection, acid injection and the like) on the core in the core holder cylinder body 1 through the liquid inlets 1-17 to prepare for subsequent experiments;
(5) starting the strain gauge 6 and the strain acquisition computer 7 and related software to establish a new task;
(6) opening a 3 interface 9-3 and a 1 interface 9-1 of a three-way valve a9, closing a 2 interface 9-2, pressurizing through a pressurizing port 3-1 of a lower hydraulic jack 3 by using a hand pump a8, ensuring that a loading shaft 3-6 of the lower hydraulic jack 3 acts on a lower loading shaft 1-12, simultaneously ensuring that a fixed loading shaft 5-1 of an upper fixed loading device 5 acts on an upper loading shaft 1-20, and simultaneously ensuring that the forces of the upper fixed loading device and the lower hydraulic jack acting on the rock core holder are in equal and opposite directions.
(7) Starting the experiment, clicking a start button of software on the stress-strain acquisition computer 7, and recording the loading change process of the rock in a stressed state;
(8) ending the experiment until the core is fractured;
(9) stopping software operation, and storing experimental data;
(10) changing the rock core, and repeating the experimental steps (3) - (9) to obtain a plurality of groups of experimental data;
(11) and unloading the pressure relief and arranging the experimental equipment, and processing experimental data.
Example 4:
an experimental method for testing the shear strength of the rock utilizes the experimental device described in embodiment 1, and the specific operation process is as follows:
(1) drilling a core according to experimental requirements, and polishing the drilled core for later use;
(2) the attached experimental set-up is shown in FIG. 5. When connecting the equipment, the upper loading shaft 1-20 and the fixed loading shaft 5-1 of the upper fixed loading device 5 are in a critical contact state (no force contact);
(3) putting the core into the core cavity 1-9, sequentially matching a left core plug, a right core plug, a left steel cover 1-18 and a right steel cover (1-8), and assembling the whole core holder to prepare for an experiment;
(4) performing reservoir measure condition simulation (water injection, acid injection and the like) on the core in the core holder cylinder body 1 through the liquid inlets 1-17 to prepare for subsequent experiments;
(5) starting the strain gauge 6 and the strain acquisition computer 7 and related software to establish a new task;
(6) opening all the interfaces of the three-way valve b11, opening the 1 interface 12-1 and the 2 interface 12-2 of the three-way valve c12, closing the 3 interface 12-3, opening the 1 interface 13-1 and the 3 interface 13-3 of the three-way valve d13, closing the 2 interface 13-2, supplying pressure to the lower pressurizing port 4-5 of the left hydraulic jack 4 and the upper pressurizing port 2-3 of the right hydraulic jack 2 through the 1 interface 11-1 of the three-way valve b11 by using the hand pump b10, and ensuring that the lower impacting shaft 4-2 of the left hydraulic jack 4 and the upper impacting shaft 2-8 of the right hydraulic jack 2 act on the left lower loading shaft 1-15 and the right upper loading shaft 1-4 with the same force;
(7) starting the experiment, clicking a start button of software on the stress-strain acquisition computer 7, and recording the loading change process of the rock in a stressed state;
(8) ending the experiment until the core is fractured;
(9) stopping software operation, and storing experimental data;
(10) changing the rock core, and repeating the experimental steps (3) - (10) to obtain a plurality of groups of experimental data;
(11) and unloading the pressure relief and arranging the experimental equipment, and processing experimental data.
Claims (4)
1. An integrated multifunctional rock mechanical parameter testing experimental device capable of simulating oil reservoir measure conditions comprises a rock core holder, a loading device and a control analysis device; it is characterized in that the preparation method is characterized in that,
the core holder comprises a cylinder body, a rubber sleeve is arranged in the cylinder body, a hollow area in the rubber sleeve is a core cavity, and a confining pressure pressurizing port, a confining pressure relief port, an upper loading shaft and a lower loading shaft are arranged on the cylinder body; the left core plug and the right core plug are arranged at two ends of the cylinder body and are respectively connected with the cylinder body in a sealing mode through a left steel cover and a right steel cover, the left core plug comprises a left upper loading shaft and a left lower loading shaft which are arranged in parallel, the left upper loading shaft is provided with a liquid inlet, the right core plug comprises a right upper loading shaft and a right lower loading shaft which are arranged in parallel, the right upper loading shaft is provided with a wire outlet hole, and the right lower loading shaft is provided with a liquid outlet;
the loading device comprises a left hydraulic jack, a right hydraulic jack, an upper loading device and a lower loading device; the left hydraulic jack and the right hydraulic jack have the same structure and comprise an upper pressurizing port, a lower pressurizing port, an upper pressure relief port, a lower pressure relief port, an upper impact shaft and a lower impact shaft; the upper loading device is provided with a fixed loading shaft which is in contact with the upper loading shaft, and the lower loading device is a single-cavity hydraulic jack;
the control analysis device comprises a stress strain acquisition computer, a strain gauge, a hand pump a, a hand pump b, a three-way valve a, a three-way valve b, a three-way valve c and a three-way valve d; the stress-strain acquisition computer is connected with the strain gauge and then is connected into the wire outlet hole; the hand pump a is connected with a port 1 of the three-way valve a, a port 2 of the three-way valve a is connected with a confining pressure pressurizing port on the cylinder body, and a port 3 of the three-way valve a is connected with a pressurizing port of the lower loading device; the hand pump b is connected with the port 1 of the three-way valve b, the port 2 of the three-way valve b is connected with the port 1 of the three-way valve c, and the port 3 of the three-way valve b is connected with the port 1 of the three-way valve d; the interface 2 of the three-way valve c is connected with the upper pressurizing port of the right hydraulic jack, and the interface 3 of the three-way valve c is connected with the lower pressurizing port of the right hydraulic jack; the interface 2 of the three-way valve d is connected with the upper pressurizing port of the left hydraulic jack, and the interface 3 of the three-way valve d is connected with the lower pressurizing port of the left hydraulic jack;
an upper backing plate and a lower backing plate are arranged between the rubber sleeve and the wall of the cylinder body;
an upper sliding sleeve and a lower sliding sleeve are arranged on the cylinder body, an upper loading shaft penetrates through the upper sliding sleeve to be in contact with the upper backing plate, and a lower loading shaft penetrates through the lower sliding sleeve to be in contact with the lower backing plate;
the left hydraulic jack and the right hydraulic jack are both single-cylinder double-cavity hydraulic jacks, and the upper impact shaft and the lower impact shaft are respectively positioned in the upper cavity and the lower cavity.
2. The integrated multifunctional rock mechanical parameter testing experimental device as claimed in claim 1, wherein the single-cavity hydraulic jack comprises a supporting seat, a cavity and a loading shaft, the cavity is arranged on the supporting seat, the loading shaft is arranged in the cavity, and a pressure inlet and a pressure relief inlet are arranged on the cavity.
3. The integrated multifunctional rock mechanical parameter testing experimental device as claimed in claim 2, wherein the supporting seat is provided with bolt holes, and the supporting seat is fixedly installed on the ground through anchor bolts.
4. A working method of the integrated multifunctional rock mechanical parameter testing experimental device as claimed in any one of claims 1-3, comprising the following steps:
(1) manufacturing a rock core according to experimental requirements;
(2) putting the core into the core cavity, and sealing the core holder;
(3) simulating reservoir measure conditions of the oil reservoir of the core in the core holder through the liquid inlet to prepare an experiment;
(4) starting to test different rock mechanical parameters, wherein when the rock triaxial pseudo-compression strength test is carried out, a confining pressure pressurizing port is opened, and a rock core is loaded with confining pressure by using a hand pump;
(5) starting a strain gauge and a strain acquisition computer and related software, and establishing a new task;
(6) according to different rock mechanical parameter test experiment requirements, a hand-operated pump is used for providing pressure for a left hydraulic jack and/or a right hydraulic jack, so that the left hydraulic jack and/or the right hydraulic jack can impact different core plug loading shafts, and the core can be loaded;
(7) clicking a starting button of software on a stress-strain acquisition computer, and recording the loading change process of the rock core in a stressed state;
(8) ending the experiment until the core is fractured;
(9) stopping software operation, and storing experimental data;
(10) changing the core, and repeating the experimental steps (3) - (9);
(11) and unloading the pressure relief and arranging the experimental equipment, and processing experimental data.
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| CN110954406B (en) * | 2019-12-19 | 2020-08-18 | 浙江中星制针股份有限公司 | High alumina porcelain insulating material mechanical strength check out test set |
| CN113804248B (en) * | 2021-08-24 | 2023-09-22 | 中国石油大学(华东) | Nondestructive ground stress testing device and method using digital speckle and finite element technology |
| CN113848163A (en) * | 2021-09-26 | 2021-12-28 | 中国石油大学(华东) | Core holder for porosity and permeability test under high-temperature high-pressure true triaxial stress |
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