CN108318345B - Multi-azimuth borehole fracture pressure testing device - Google Patents
Multi-azimuth borehole fracture pressure testing device Download PDFInfo
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- CN108318345B CN108318345B CN201810377093.8A CN201810377093A CN108318345B CN 108318345 B CN108318345 B CN 108318345B CN 201810377093 A CN201810377093 A CN 201810377093A CN 108318345 B CN108318345 B CN 108318345B
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- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 230000007246 mechanism Effects 0.000 claims abstract description 108
- 239000011435 rock Substances 0.000 claims abstract description 57
- 238000006073 displacement reaction Methods 0.000 claims abstract description 28
- 239000000523 sample Substances 0.000 claims description 29
- 239000012530 fluid Substances 0.000 claims description 16
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000005259 measurement Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
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- G—PHYSICS
- 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
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a multi-azimuth angle well fracture pressure testing device which comprises a pressure kettle, a diversion plug, an axial thrust mechanism, a displacement control mechanism, a temperature control mechanism, an acoustic mechanism and an expansion mechanism, wherein the pressure kettle comprises a first fixed side wall, a second fixed side wall and an elastic wall, a first cavity is formed between the first fixed side wall and the second fixed side wall, and the inner side wall of the elastic wall forms a second cavity; the axial thrust mechanism is positioned at the other side of the rock relative to the diversion plug, and can move relative to the pressure kettle; the expansion mechanism comprises an expansion pipe which is arranged on the thrust rod and can deform along the radial direction, and an expansion joint which is arranged on the flow guide plug. The expansion mechanism is independently circulated, so that independent control of the borehole confining pressure and the axial pressure can be realized, meanwhile, control of applying different pressures and different temperatures to the flow passage in the borehole can be realized, and the fracture pressure of the borehole rock can be estimated through the volume deformation of the expansion pipe.
Description
Technical Field
The invention relates to the field of rock mechanics experiments, in particular to a multi-azimuth angle well fracture pressure testing device.
Background
Along with the deep development of oil gas, the vertical drilling depth is close to ten thousand meters, the lengths of open hole sections of different well types are continuously increased, the drilling safety window is narrower and narrower, meanwhile, the temperature environment of deep rock is obviously increased, the temperature of the deep well wall rock can even reach more than 350 ℃ in the high Wen Jingzuan well process, the structure and mechanical properties of the rock can be changed due to the change of the rock temperature, so that the influence rule of the temperature change on the mechanical properties of the rock and damage mechanism is accurately known, the well wall strength is judged and predicted, and the well wall stability in particular in a high-temperature state has important practical significance for safe drilling engineering.
The existing rock mechanical test simulating the complex environment of the deep rock is mainly carried out on a rock mechanical test device represented by a constant-temperature static mechanical test machine, so that the mechanical properties of the rock under the conditions of constant-temperature seepage and static pressure coupling are obtained. As early as the 80 s of the 20 th century, the rock medium acoustic test device is mature, but is limited by the device, the rock acoustic test is not synchronous with the mechanical test all the time, and an acoustic response device capable of meeting the rock high-pressure temperature change state is not provided; the expansion pipe has the characteristics of large expansion volume, uniform deformation and the like, is widely used for well repair, tail pipe and the like in drilling engineering, changes the existing mechanical loading mode and integrates the prior art.
1. For shallow low-temperature stratum, the traditional mechanical test mode is adopted to meet the determination of physical parameters of rock, the method is mature, data acquisition is direct, development of acoustic response test is limited, drilling and core production are not needed in acoustic test, and cost and time are greatly saved; 2. with the development of high-temperature high-pressure wells, the influence of the combined action of high temperature and high pressure on petrophysical parameters is aggravated, and the single temperature or confining pressure environment simulation cannot accurately simulate the required environment. 3. The expansion pipe technology is a novel material technology, and the pressure control of the expansion pipe is difficult.
Therefore, a set of economic and simple indoor measuring method and device are developed and researched, and the method and the device are urgent matters for solving the problem of research on the stability mechanics of the well wall of a deep high Wen Jingzuan well.
Disclosure of Invention
In order to overcome the defects in the prior art, the technical problem to be solved by the invention is to provide a multi-azimuth angle well fracture pressure testing device which can test the fracture pressure of rock under different temperature changes.
The specific technical scheme of the invention is as follows: the utility model provides a diversified angle well hole pressure testing arrangement that breaks, includes autoclave, water conservancy diversion end cap, axial thrust mechanism, displacement control mechanism, temperature control mechanism, acoustic mechanism and expansion mechanism, wherein, autoclave includes first fixed lateral wall, sets up the second fixed lateral wall in the first fixed lateral wall, sets up in the second fixed lateral wall and can radially produce the elastic wall of deformation, form first cavity between first fixed lateral wall and the second fixed lateral wall, the elastic wall inboard encloses and constitutes the second cavity; the flow guide plug is arranged in the elastic wall for accommodating rocks, and a flow guide pipe communicated with the second cavity is arranged on the flow guide plug; the axial thrust mechanism is positioned at the other side of the rock relative to the diversion plug, the axial thrust mechanism can move relative to the pressure kettle, one end of the axial thrust mechanism positioned in the pressure kettle is provided with a diversion mechanism capable of being jointed with the first chamber and the second chamber, and the diversion mechanism comprises a seepage channel capable of communicating the first chamber and the second chamber when the diversion mechanism is jointed with the first chamber and the second chamber; the displacement control mechanism can move radially relative to the second fixed side wall, one end of the displacement control mechanism is positioned in the first cavity, and the other end of the displacement control mechanism is arranged on the elastic wall; the temperature control mechanism comprises a fluid source communicated with the first cavity and a temperature detection unit arranged at the flow guide pipe; the acoustic mechanism comprises an acoustic wave transmitting device arranged on one side of the diversion plug, which is away from the rock, and an acoustic wave receiving device arranged on one side of the seepage plug, which is away from the rock, or an acoustic wave receiving device arranged on one side of the diversion plug, which is away from the rock, and an acoustic wave transmitting device arranged on one side of the seepage plug, which is away from the rock; the expansion mechanism comprises an expansion pipe which is arranged on the thrust rod and can deform along the radial direction, and an expansion joint which is arranged on the flow guide plug, wherein the expansion joint can be connected with the expansion pipe when the seepage plug is connected with the pressure kettle.
Preferably, the pressure kettle comprises an upper cover, the axial thrust mechanism comprises an axial loading mechanism and a thrust rod which can be in transmission connection with the axial loading mechanism and penetrates through the upper cover, one end of the thrust rod, which is positioned in the pressure kettle, is fixedly provided with a sealing cover plate sealed with the upper cover, the seepage plug is fixedly arranged on the sealing cover plate, and the expansion pipe penetrates through the seepage plug.
Preferably, the seepage plug is provided with a protective cover on the side facing away from the rock, and the protective cover is arranged outside the acoustic probe.
Preferably, the autoclave comprises a bottom plate, a liquid guide plug communicated with the first chamber is arranged on the bottom plate, and the liquid guide plug penetrates through the bottom plate.
Preferably, the temperature control mechanism can control the fluid source according to the data obtained by the temperature detection unit, a cavity is formed between the diversion plug and the bottom plate, and the acoustic probe is arranged in the cavity.
Preferably, the seepage interface is provided with a plurality of diversion trenches distributed along the circumferential direction on one side of the seepage interface facing the rock, and each diversion trench is communicated with the seepage channel.
Preferably, the acoustic probe is a periodic acoustic probe, and the acoustic probe includes a transverse wave acoustic probe and a longitudinal wave acoustic probe.
Preferably, the device comprises an inclination angle control device, wherein the inclination angle control device can enable the pressure kettle to rotate so as to enable the pressure kettle to form an included angle relative to the horizontal plane.
Preferably, the displacement control mechanism comprises a displacement sensor.
Preferably, an end of the expansion pipe joint facing away from the expansion pipe is closed.
Preferably, a control unit is included for controlling the axial thrust mechanism, the displacement control mechanism, the temperature control mechanism, the acoustic mechanism.
The invention has the advantages that: the expansion mechanism is independently circulated, so that independent control of the borehole confining pressure and the axial pressure can be realized, meanwhile, control of applying different pressures and different temperatures to a borehole flow channel can be realized, the fracture pressure of borehole rock is calculated through the volume deformation of an expansion pipe, acoustic signals are used for auxiliary measurement, and the relationship between the acoustic signals and mechanical characteristics is established when the underground borehole wall strength is predicted and evaluated, so that a guiding basis is provided for the borehole wall stability prediction of an oil-gas deep well, an ultra-deep well and a high-temperature well.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be.
Fig. 1 is a schematic structural diagram of a multi-azimuth borehole fracture pressure testing device according to an embodiment of the invention.
FIG. 2 is a bottom view of the axial thrust mechanism;
FIG. 3 is a schematic cross-sectional view of FIG. 2;
FIG. 4 is a top view of the autoclave;
FIG. 5 is a cross-sectional view of FIG. 4;
fig. 6 is a schematic diagram of a rock stress test.
Reference numerals of the above drawings: 1-a pressure kettle; a 2-acoustic mechanism; 3-an expansion mechanism; 4-tilt angle control mechanism; 41-a flange connection seat; 42-a console base; 43-supporting rods; 44-hydraulic drive means; 45-screw rod; 46-a hydraulic control box; 5-a control unit; 101-a first fixed sidewall; 102-a second fixed sidewall; 103-a displacement control mechanism; 104 a-upper sealing ram; 104 b-a diversion plug; 105-a liquid guide plug; 106-seepage plugs; 107-percolation interface; 108-sealing the cover plate; 109-upper cover; 110-an elastic wall; 201-transmitting a probe; 202-interface; 203-receiving probes; 301-expanding the tube; 302 a-upper expansion shorting; 302 b-lower expansion shorting; 303-boost line.
Detailed Description
The details of the invention will be more clearly understood in conjunction with the accompanying drawings and description of specific embodiments of the invention. However, the specific embodiments of the invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Given the teachings of the present invention, one of ordinary skill in the related art will contemplate any possible modification based on the present invention, and such should be considered to be within the scope of the present invention.
Referring to fig. 1, 2, 3, 4, and 5, a multi-azimuth angle well fracture pressure testing device in an embodiment of the present application includes: the pressure kettle 1 comprises a first fixed side wall 101, a second fixed side wall 102 arranged in the first fixed side wall 101, and an elastic wall 110 which is arranged in the second fixed side wall 102 and can radially deform, wherein a first chamber is formed between the first fixed side wall 101 and the second fixed side wall 102, and the inner side wall of the elastic wall 110 forms a second chamber; the flow guiding plug 104b is arranged in the elastic wall 110 for accommodating rock, and a flow guiding pipe communicated with the second chamber is arranged on the flow guiding plug 104 b; the axial thrust mechanism is positioned at the other side of the rock relative to the diversion plug 104b, the axial thrust mechanism can move relative to the pressure kettle 1, one end of the axial thrust mechanism positioned in the pressure kettle 1 is provided with a seepage plug 106 which can be jointed with the pressure kettle 1, and the seepage plug 106 is provided with a seepage channel which can be communicated between the first chamber and the second chamber when the seepage plug 106 is jointed with the pressure kettle 1; the displacement control mechanism 103 can move along the radial direction relative to the second fixed side wall 102, one end of the displacement control mechanism 103 is positioned in the first cavity, and the other end of the displacement control mechanism 103 is arranged on the elastic wall 110; the temperature control mechanism comprises a fluid source communicated with the first cavity and a temperature detection unit arranged at the flow guide pipe; the acoustic mechanism 2 comprises an acoustic wave transmitting device arranged on one side of the diversion plug 104b, which is away from the rock, and an acoustic wave receiving device arranged on one side of the seepage plug 106, which is away from the rock, or an acoustic wave receiving device arranged on one side of the diversion plug 104b, which is away from the rock, and an acoustic wave transmitting device arranged on one side of the seepage plug 106, which is away from the rock; the expansion mechanism 3 comprises an expansion pipe 301 which is arranged on the thrust rod and can deform along the radial direction, and a lower expansion short circuit 302b which is arranged on the flow guide plug 104b, wherein the lower expansion short circuit 302b can be connected with the expansion pipe 301 when the seepage plug 106 is connected with the pressure kettle 1.
By means of the structure, fluid entering from the first chamber can enter the elastic wall 110 from the seepage channel of the seepage plug 106, the fluid in the first chamber can provide radial acting force for the elastic wall 110 through the displacement control mechanism 103, the fluid entering the elastic wall 110 can provide axial acting force for rock, and the temperature control mechanism can control the temperature of the fluid in the elastic wall 110 according to the temperature sensor, so that a high-temperature and high-pressure structure of the rock is constructed. Also, the acoustic mechanism 2 may perform acoustic testing of the rock within the elastic wall 110. Meanwhile, control of applying different pressures and different temperatures to the flow passage in the well bore can be realized, and the fracture pressure of the well bore rock is calculated through the volume deformation of the expansion pipe 301.
Referring to fig. 4 and 5, specifically, the autoclave 1 includes a bottom wall, a first fixed side wall 101 provided on the bottom wall, a second fixed side wall 102 provided on the bottom wall, and an elastic wall 110 provided on the bottom wall. The second fixed sidewall 102 is located inside the first fixed sidewall 101, and a gap space therebetween forms a first chamber. The second fixed sidewall 102 is located inside the second fixed sidewall 102, and an inner wall of the second fixed sidewall 102 surrounds to form a second chamber.
The first fixed sidewall 101 has a flange, which may be connected with the upper cover 109 by a flange. The bottom wall can be connected with the inclination angle control mechanism 4 through a flange. The device comprises an inclination angle control device, wherein the inclination angle control device can enable the pressure kettle 1 to rotate so that the pressure kettle 1 forms an included angle relative to the horizontal plane. Specifically, the tilt angle control mechanism 4 includes a flange connection base 41, a console base 42, a support rod 43, a hydraulic driving device 44 (e.g., a jack), a screw 45, and a hydraulic control box 46, and the hydraulic control box 46 can control the hydraulic driving device 44 to extend or retract. The flange connection seat 41 is fixedly provided on the bottom wall. One end of a supporting rod 43 is fixedly arranged on the console base 42, and the other end of the supporting rod 43 is hinged with the flange connecting seat 41. The hydraulic driving device 44 can enable the flange connecting seat 41 to drive the autoclave 1 to rotate relative to the supporting rod 43, so that an included angle is formed between the autoclave and the horizontal plane. A screw 45 is provided between the flange connection seat 41 and the console base 42 for fixing the autoclave 1 when the hydraulic driving device 44 is operated to a predetermined position. A liquid guide plug 105 communicated with the first chamber is also arranged on the bottom wall of the pressure kettle 1.
The first and second fixed sidewalls 101 and 102 may be made of a steel structure. The elastic wall 110 may be made of a high-deformation metal. Wherein the first fixed side wall 101 and the bottom wall may be of unitary construction. The second fixed sidewall 102 may be fixed to the bottom wall by a pin. The elastic wall 110 may be deformed in a radial direction.
A diversion bulkhead 104b is provided at the lower end of the interior of the elastic wall 110. Rock may be placed on the diversion bulkhead 104b and within the second chamber. The diversion plugs 104b and the bottom wall are provided with diversion pipes communicated with the second chamber. The flow guide pipe can discharge the fluid in the second cavity.
Referring to fig. 1, the displacement control mechanism 103 is capable of moving radially with respect to the rigid tub, one end of the displacement control mechanism 103 is located in the first chamber, and the other end of the displacement control mechanism 103 is disposed on the elastic wall 110. The fluid in the first chamber may exert a radial force on the elastic wall 110 by the displacement control mechanism 103, thereby radially deforming the elastic wall 110. The displacement control mechanism 103 further includes a displacement sensor capable of detecting the amount of deformation of the elastic wall 110 in the radial direction.
Referring to fig. 2 and 3, the axial thrust mechanism includes an axial loading device, a thrust rod that can be in transmission connection with the axial loading device and is arranged on the upper cover 109 in a penetrating manner, a sealing cover plate 108 that is sealed with the upper cover 109 is fixedly arranged at one end of the thrust rod in the autoclave 1, and the diversion mechanism includes a seepage plug 106 and a seepage interface 107. The seepage plug 106 is connected with the seepage interface 107 through a bolt, and the seepage interface 107 is fixed on the sealing cover plate 108 through a bolt.
The percolation interface 107 can be sealed with the upper portion of the first chamber and the percolation stopper 106 can be sealed with the upper portion of the second chamber. The seepage interface 107 is provided with a plurality of diversion trenches distributed along the circumferential direction on one side facing the rock, and each diversion trench is communicated with the seepage channel. The seepage channel is communicated with the second chamber, and the diversion trench is communicated with the first chamber. The thrust rod of the axial thrust mechanism is movable relative to the autoclave 1 so as to engage the deflector mechanism with the first fixed side wall 101, the second fixed side wall 102 and the elastic wall, thereby communicating the first chamber with the second chamber.
Referring to fig. 1, in the present embodiment, the temperature control mechanism includes a fluid source communicating with the first chamber and a temperature sensor provided at the draft tube. The temperature control mechanism is capable of controlling the fluid source based on data obtained from the temperature sensor. Specifically, the temperature control mechanism may include an electric heating furnace, a temperature sensor, a temperature display, a signal output interface 202, and a resistance control valve. The liquid inlet of the temperature control mechanism is connected with the liquid inlet box, the outlet of the temperature control mechanism is communicated with the liquid guide plug 105, and the temperature sensor is arranged in the liquid guide groove. The control unit 5 is respectively connected with the signal output interface 202 and the temperature display, controls the position of the resistor control valve, adjusts the size of the heating resistor, stores temperature data and displays the current temperature value.
In this embodiment, the seepage plug 106 is provided with a protective cover on its side facing away from the rock, which protective cover is arranged outside the acoustic wave emitter. A chamber is formed between the diversion plug 104b and the bottom wall, and the acoustic wave receiving device is arranged in the chamber.
The sound wave transmitting device comprises a sound emission probe 201, a wire interface 202, a probe protective shell, a pressing gasket, a bolt and a sealing pin. The acoustic emission probe 201 is built in a protective cover with certain rigidity; the transmitting probe 201 is fixed in the groove of the seepage plug 106, and in order to ensure that the acoustic transmitting probe 201 is well contacted with the seepage plug 106, the end part of the acoustic transmitting probe 201 and the contact surface of the seepage plug 106 are coated with coupling agent respectively; the protection cover is connected with the sealing cover plate 108 through a pressing gasket and a bolt, and the acoustic emission probe 201 is in a sealing state and is used for preventing the acoustic emission probe 201 from being damaged due to the fact that the acoustic emission probe 201 bears the liquid pressure. Wires connect to external devices through interface 202. The sealing pin is connected with the protective cover and the cover plate.
The sound wave receiving device comprises two sealing cavities, a pressing gasket, a pressing pin, a wire outlet and a sealing pin. Longitudinal wave probes and transverse wave probes are respectively arranged in the two sealed cavities. The function of the compression pin and the compression washer is to fasten the two probes in the respective sealed chambers. The sound wave transmitting device and the sound wave receiving device are periodic test probes.
Of course, in a further alternative embodiment, the percolating plug 106 is provided with a protective cover on its side facing away from the rock, which protective cover is arranged outside the sound wave receiving device. A cavity is formed between the diversion plug 104b and the bottom wall, and the acoustic wave emitting device is arranged in the cavity. In particular, the acoustic wave receiving means and the transmitting means comprise periodic acoustic probes. The acoustic wave receiving apparatus includes a transverse wave acoustic receiving probe 203 and a longitudinal wave acoustic receiving probe 203.
The expansion mechanism 3 comprises a pressurizing pipeline 303, an upper sealing pressure head 104a penetrating through the upper cover 109 and communicated with the pressurizing pipeline 303, an expansion short circuit connected with the upper sealing pressure head 104a and penetrating through the protective cover and the seepage plug 106, an expansion pipe 301 connected with the lower end of the upper expansion short circuit 302a, and a lower expansion short circuit 302b arranged on the diversion plug 104b, wherein the lower expansion short circuit 302b can be jointed with the expansion pipe 301 when the seepage plug 106 is jointed with the pressure kettle 1. The booster line 303 may be in communication with an electric furnace to receive the high temperature fluid.
The embodiment of the application further comprises a control unit 5, wherein the control unit 5 is used for controlling the axial thrust mechanism, the displacement control mechanism 103, the temperature control mechanism, the acoustic mechanism 2 and the expansion mechanism 3. Specifically, the control unit 5 includes a signal receiving and converting module, a computer, and processing software, and can implement measurement and control of temperature, pressure, displacement, sound wave, and inclination angle during the test.
The test procedure provided in this example is as follows:
(1) Rock is placed into the rock pressure chamber.
(2) The inclination angle control mechanism 4 is modulated and set to fix the inclination angle.
(3) The acoustic wave transmitting means and the acoustic wave receiving means are turned on and recording is started.
(4) And adjusting the temperature control mechanism, heating the medium in the liquid outlet pipe to a set temperature, injecting fluid into the first chamber to apply confining pressure, and injecting fluid into the expansion pipe 301 to deform the expansion pipe 301.
(5) Pressurizing and heating.
(6) After the experiment is finished, oil is discharged.
(7) Opening the pressure cavity, taking the device out of the test bed, and discharging engineering liquid.
Referring to fig. 6, the method is suitable for synchronous monitoring of rock acoustic wave states in the rock mechanics triaxial experiment process, is suitable for acoustic wave state measurement of rock under different temperature and pressure environments, is suitable for synchronous measurement of mechanical and acoustic wave information of rock around different well types (vertical well, horizontal well and directional well) wellbores under different temperature and pressure environments, and can solve rock acoustic wave state and mechanical parameter measurement under high temperature and high pressure conditions.
The invention has the advantages that: the expansion mechanism 3 is independently circulated, so that independent control of borehole confining pressure and axial pressure can be realized, control of applying different pressures and different temperatures to a borehole flow channel can be realized, the fracture pressure of borehole rock is estimated through the volume deformation of the expansion pipe 301, acoustic signals are used for assisting in measurement, and the relationship between acoustic signals and mechanical characteristics is established when the underground borehole wall strength is predicted and evaluated, so that a guiding basis is provided for the borehole wall stability prediction of an oil-gas deep well, an ultra-deep well and a high-temperature well.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described by differences from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (9)
1. The utility model provides a diversified angle well hole pressure testing arrangement that breaks, its characterized in that includes autoclave, water conservancy diversion end cap, axial thrust mechanism, displacement control mechanism, inclination controlling means, temperature control mechanism, acoustic mechanism and expansion mechanism, wherein, the autoclave includes first fixed lateral wall, sets up the second fixed lateral wall in the first fixed lateral wall, sets up in the second fixed lateral wall and can radially produce the elastic wall of deformation, form first cavity between first fixed lateral wall and the second fixed lateral wall, the elastic wall inboard encloses and constitutes the second cavity; the flow guide plug is arranged in the elastic wall for accommodating rocks, and a flow guide pipe communicated with the second cavity is arranged on the flow guide plug; the axial thrust mechanism is positioned at the other side of the rock relative to the diversion plug, the axial thrust mechanism can move relative to the pressure kettle, one end of the axial thrust mechanism positioned in the pressure kettle is provided with a diversion mechanism capable of being jointed with the first chamber and the second chamber, and the diversion mechanism comprises a seepage plug and a seepage channel capable of communicating the first chamber and the second chamber when the diversion mechanism is jointed with the first chamber and the second chamber; the displacement control mechanism can move radially relative to the second fixed side wall, one end of the displacement control mechanism is positioned in the first cavity, and the other end of the displacement control mechanism is arranged on the elastic wall; the inclination angle control device can enable the pressure kettle to rotate so as to enable the pressure kettle to form an included angle relative to the horizontal plane, and the displacement control mechanism comprises a displacement sensor; the temperature control mechanism comprises a fluid source communicated with the first cavity and a temperature detection unit arranged at the flow guide pipe; the acoustic mechanism comprises an acoustic wave transmitting device arranged on one side of the diversion plug, which is away from the rock, and an acoustic wave receiving device arranged on one side of the seepage plug, which is away from the rock, or an acoustic wave receiving device arranged on one side of the diversion plug, which is away from the rock, and an acoustic wave transmitting device arranged on one side of the seepage plug, which is away from the rock; the expansion mechanism comprises an expansion pipe which is arranged on the thrust rod and can deform along the radial direction, and an expansion joint which is arranged on the flow guide plug, wherein the expansion joint can be jointed with the expansion pipe when the seepage plug is jointed with the pressure kettle.
2. The multi-azimuth angle well fracture pressure testing device according to claim 1, wherein the pressure kettle comprises an upper cover, the axial thrust mechanism comprises an axial loading mechanism and a thrust rod which can be in transmission connection with the axial loading mechanism and is arranged on the upper cover in a penetrating manner, one end of the thrust rod in the pressure kettle is fixedly provided with a sealing cover plate sealed with the upper cover, the seepage plug is fixedly arranged on the sealing cover plate, and the expansion pipe penetrates through the seepage plug.
3. The multi-azimuth wellbore fracture pressure testing device according to claim 1, wherein the seepage plug is provided with a protective cover on a side facing away from the rock, and the protective cover is arranged outside the acoustic mechanism.
4. The multi-azimuth wellbore fracture pressure testing device according to claim 1, wherein the pressure kettle comprises a bottom plate, a liquid guide plug communicated with the first chamber is arranged on the bottom plate, and the liquid guide plug is arranged on the bottom plate in a penetrating manner.
5. The multi-azimuth wellbore fracture pressure testing device of claim 4, wherein the temperature control mechanism is capable of controlling the fluid source according to data obtained by the temperature detection unit, a chamber is formed between the diversion plug and the bottom plate, and an acoustic probe is disposed in the chamber.
6. The multi-azimuth wellbore fracture pressure testing device according to claim 1, wherein the diversion mechanism comprises a seepage interface, a plurality of diversion trenches distributed along the circumferential direction are arranged on one side of the seepage interface facing the rock, and each diversion trench is communicated with the seepage channel.
7. The multi-azimuth wellbore fracturing pressure testing device of claim 1, wherein the acoustic mechanism is a periodic acoustic probe comprising a shear wave acoustic probe and a longitudinal wave acoustic probe.
8. The multi-azimuth wellbore fracture pressure testing device of claim 1, wherein an end of the expansion tube joint facing away from the expansion tube is closed.
9. The multi-azimuth wellbore fracturing pressure test device of claim 1, comprising a control unit for controlling the axial thrust mechanism, the displacement control mechanism, the temperature control mechanism, the acoustic mechanism, and the expansion mechanism.
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| CN109738297B (en) * | 2019-03-01 | 2024-01-05 | 中海石油(中国)有限公司湛江分公司 | Horizontal well borehole deformation infrared monitoring device and method |
| CN110529112B (en) * | 2019-09-06 | 2020-12-01 | 中国石油大学(华东) | Hydraulic soundless directional breaker for rock mass |
| CN111189909A (en) * | 2020-01-09 | 2020-05-22 | 中国石油大学(北京) | Superficial layer water flow sound wave testing device |
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