CN213842978U - Drilling tool material corrosion test bed under simulated drilling environment - Google Patents
Drilling tool material corrosion test bed under simulated drilling environment Download PDFInfo
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- CN213842978U CN213842978U CN202022905958.9U CN202022905958U CN213842978U CN 213842978 U CN213842978 U CN 213842978U CN 202022905958 U CN202022905958 U CN 202022905958U CN 213842978 U CN213842978 U CN 213842978U
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- 238000005260 corrosion Methods 0.000 title claims abstract description 49
- 230000007797 corrosion Effects 0.000 title claims abstract description 49
- 239000000463 material Substances 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 title claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 77
- 238000002347 injection Methods 0.000 claims abstract description 36
- 239000007924 injection Substances 0.000 claims abstract description 36
- 238000004088 simulation Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 239000000243 solution Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 42
- 239000007788 liquid Substances 0.000 claims description 40
- 238000004321 preservation Methods 0.000 claims description 33
- 238000002474 experimental method Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 description 24
- 230000005855 radiation Effects 0.000 description 6
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 3
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910001961 silver nitrate Inorganic materials 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000004580 weight loss Effects 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910000856 hastalloy Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000002791 soaking Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a drilling tool material corrosion test platform under simulation drilling environment, including switch board, rotary power system, high temperature high pressure reaction cauldron system, high-pressure solution injection and pressurize system and sample clamping device, rotary power system sets up on the switch board, and high temperature high pressure reaction cauldron system sets up on the switch board, and high pressure solution injection and pressurize system set up on the switch board, and sample clamping device sets up on rotary power system, the utility model discloses go on in controllable temperature and the controllable reation kettle of cauldron internal medium pressure, adopt the rotatory mode of sample to realize the counter flow simulation, utilize to rotate sealing device and guarantee the cauldron internal pressure, solve the unable simulation corrosion environment problem of simulation drilling experimental facilities among the prior art, realize controllable temperature, pressure, three-field coupling of velocity of flow corrosion environment simulation under the well, simultaneously deployable temperature, pressure, And (3) testing the corrosion performance of the drilling tool material under the coupling of three fields of flow velocity, analyzing the corrosion behavior and optimizing the drilling process parameters.
Description
Technical Field
The utility model relates to a drilling engineering and the interdisciplinary field of material corruption, especially a drilling tool material corrosion test platform under simulation drilling environment.
Background
According to dynamic assessment (2015) of national oil and gas resources, the recoverable resource amount of petroleum in China is 301 hundred million tons, however, most of 198 million tons of resources to be explored are buried below 5000m, and a scientific innovation strategy of 'three deep-soil' clearly provides 'oil and gas exploration technical capability of 6500-10000 m depth and implementation of a ten thousand meter scientific drilling plan', and with continuous complication of oil and gas exploration and development objects, the well depth is continuously increased, the rock hardness, the bottom hole pressure and the temperature are more and more complex, so that the problems of low rock breaking efficiency, short service life of a drill bit, aggravation of corrosion of drilling tool materials, slow drilling speed and the like are caused.
Whether deep oil and gas drilling or deep continental scientific drilling, corrosion under the conditions of high temperature, high pressure and high flushing in the well is increasingly becoming an important influence factor for restricting the application of drilling tool materials, for example, when an aluminum alloy drilling rod is used in the national continental scientific drilling engineering 'Pinkou second well', the drilling tool materials in the well are corroded to different degrees due to the fact that the PH value and the temperature of the drilling fluid are high and the soaking time is long, and the service life is influenced. Therefore, it is necessary to research the corrosion behavior and corrosion mechanism of drilling tool material in complex working condition environment in the well, but the present testing machines used at home and abroad to simulate the downhole working condition usually only can satisfy the simulation of high temperature and high pressure conditions for the mechanical properties of the drilling tool material, however, the corrosion behavior of the flushing fluid flowing at high speed in the well to the drilling tool material is also very important, which results in that most of the present simulated drilling experimental equipments can not satisfy the research requirements of the downhole environment to the corrosion behavior of the drilling tool material, the utility model relates to a drilling tool material corrosion test bench under the simulated drilling environment, which can realize the multi-field coupling downhole simulated environment with the simultaneous regulation and control of temperature, pressure, flow rate and corrosion liquid PH, and can be used for the research of the influence rules and corrosion performance evaluation of each influencing factor to the corrosion behavior of the drilling tool material under the complex conditions in the well, strives to provide experimental equipment support for designing and developing novel drilling tool materials with excellent corrosion resistance.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the problem among the above-mentioned background art, and provide a drilling tool material corrosion test platform under simulation drilling environment.
A drilling tool material corrosion test stand under a simulated drilling environment comprises a control cabinet, a rotary power system, a high-temperature high-pressure reaction kettle system, a high-pressure solution injection and pressure maintaining system and a sample clamping device, wherein the rotary power system is arranged on the control cabinet;
the control cabinet comprises a control panel, a box body and a fixed base, wherein the box body is used for placing the reaction kettle and a control circuit, the fixed base is fixed on the ground, the box body is fixedly arranged on the fixed base, and the control panel is used for controlling and displaying the temperature and the pressure of the reaction kettle and the rotating speed of the speed regulating motor;
the rotary power system comprises a motor rotary support, a motor rotary rod, a speed regulating motor, a motor fixing device and a rotary shaft, wherein the motor rotary support is fixed on a box body, the motor rotary rod is movably connected with the motor rotary support, the motor rotary rod can slide up and down and horizontally rotate along the motor rotary support, the motor rotary rod is locked and fixed on the motor rotary support through a nut mechanism, the speed regulating motor is fixed on the motor rotary rod and can lift in the vertical direction and twist in the horizontal direction along with the motor rotary rod, the rotary shaft is detachably connected with the speed regulating motor, the rotary shaft drives a sample to rotate in a corrosive medium in a reaction kettle to simulate the flow speed, and the speed regulating motor regulates the rotary speed to change the simulated flow speed;
the high-temperature high-pressure reaction kettle system comprises a pressure gauge, an isolation valve, a kettle cover and a heat radiation seat, a kettle cover heat preservation device, a first corrosive liquid inlet, a heating heat preservation device, a reaction kettle, a kettle bottom heat preservation and support device, a temperature sensor and a corrosive liquid outlet valve, wherein the reaction kettle is arranged on a box body, the heating heat preservation device is arranged outside the reaction kettle and is used for heating the pressure kettle, the kettle cover and the heat radiation seat are arranged on the reaction kettle, the kettle cover heat preservation and support device is arranged on the kettle cover and the heat radiation seat, the kettle bottom heat preservation and support device is arranged at the bottom of the reaction kettle, the kettle cover heat preservation device and the kettle bottom heat preservation and support device ensure that the temperature of the reaction kettle is constant and controllable, the pressure gauge and the temperature sensor are used for measuring the temperature and the pressure in the reaction kettle in real time, the isolation valve is arranged between the pressure gauge and the reaction kettle, the first corrosive liquid inlet is arranged at the upper part of the reaction kettle, and the corrosive liquid outlet valve is arranged at the lower part of the reaction kettle, before the experiment is started, the corrosive medium is pressed in through the first corrosive liquid inlet, and after the experiment is finished, the corrosive medium is discharged through the corrosive liquid outlet valve;
a rotary sealing device is arranged between the rotary shaft and the reaction kettle, the rotary sealing device adopts an inverted V-shaped structure to seal the rotary contact position of the rotary shaft and the reaction kettle, and the reaction kettle is ensured not to have pressure leakage in the process of high-speed rotation of the rotary shaft;
the high-pressure solution injection and pressure maintaining system comprises a piston container, a second corrosive liquid inlet, a control valve, an injection pump and a pressurizing pedal, wherein the top of the piston container is communicated with the first corrosive liquid inlet through a pipeline, the side wall of the piston container is provided with the second corrosive liquid inlet, corrosive media enter the piston container from the second corrosive liquid inlet, the bottom of the piston container is communicated with the injection pump through a pipeline, the control valve is arranged on the pipeline between the piston container and the injection pump, the pressurizing pedal is arranged on the injection pump, the corrosive media are pressed into the reaction kettle from the piston container by pushing the piston through the injection pump by stepping the pressurizing pedal, and the control valve is closed to maintain pressure after the injection is finished;
the sample clamping device consists of a reducing rod body and a nut, the reducing rod body is fixed at the front end of the rotating shaft, a sample is a hollow cylinder with the inner diameter of 10mm and the outer diameter of 15mm, the diameter of the upper part of the reducing rod body is 15mm, the diameter of the lower part of the reducing rod body is 10mm, the lower end of the reducing rod body is provided with a thread, the sample is stringed at the lower part of the rod body, and the tail end of the sample is locked by the nut;
specifically, the speed regulating motor drives the rotating shaft to rotate, the rotating shaft drives the reducing rod body to rotate, the sample rotates in the reaction kettle along with the reducing rod body, the simulation of the flow velocity is realized, and the controllable regulation of the flow velocity is realized by regulating the rotating speed of the speed regulating motor;
the reaction vessel and the piston vessel are made of corrosion resistant Ha-type steel.
The utility model has the advantages that:
the utility model discloses drilling tool material corrosion test platform under simulation drilling environment goes on in the controllable reation kettle of medium pressure in controllable temperature and cauldron, adopt the rotatory mode of sample to realize the simulation to the velocity of flow, utilize and rotate the pressure in the sealing device assurance cauldron, the problem of the unable simulation corrosion environment of experimental facilities that drills into simulation among the prior art has been solved, controllable temperature has been realized, pressure, the simulation of three-field coupling underground corrosion environment of velocity of flow, the temperature can be expanded simultaneously, pressure, the three-field coupling underground drilling tool material corrosion behavior test of velocity of flow, corrosion behavior analysis and drilling process parameter are preferred.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
Referring to fig. 1, a drilling tool material corrosion test stand under a simulated drilling environment comprises a control cabinet, a rotary power system, a high-temperature high-pressure reaction kettle system, a high-pressure solution injection and pressure maintaining system and a sample clamping device, wherein the rotary power system is arranged on the control cabinet, the high-temperature high-pressure reaction kettle system is arranged on the control cabinet, the high-pressure solution injection and pressure maintaining system is arranged on the control cabinet, and the sample clamping device is arranged on the rotary power system;
the control cabinet comprises a control panel 1, a box body 2 and a fixed base 3, wherein the box body 2 is used for placing a reaction kettle 15 and a control circuit, the fixed base 3 is fixed on the ground, the box body 2 is fixedly arranged on the fixed base 3, and the control panel 1 is used for controlling and displaying the temperature and the pressure of the reaction kettle 15 and the rotating speed of the speed regulating motor 6;
the rotary power system comprises a motor rotating support 4, a motor rotating rod 5, a speed regulating motor 6, a motor fixing device 7 and a rotating shaft 17, wherein the motor rotating support 4 is fixed on the box body 2, the motor rotating rod 5 is movably connected with the motor rotating support 4, the motor rotating rod 5 can slide up and down along the motor rotating support 4 and horizontally rotate, the motor rotating rod 5 is locked and fixed on the motor rotating support 4 through a nut mechanism, the speed regulating motor 6 is fixed on the motor rotating rod 5 and can lift in the vertical direction and twist in the horizontal direction along with the motor rotating rod 5, the rotating shaft 17 is detachably connected with the speed regulating motor 6, the rotating shaft 17 drives a sample to rotate in a corrosive medium in the reaction kettle 15 to simulate the flow velocity, and the speed regulating motor 6 regulates the rotating velocity to change the simulated flow velocity;
the high-temperature high-pressure reaction kettle system comprises a pressure gauge 8, an isolation valve 9, a kettle cover and heat radiation seat 10, a kettle cover heat preservation device 11, a first corrosive liquid inlet 13, a heating heat preservation device 14, a reaction kettle 15, a kettle bottom heat preservation and support device 16, a temperature sensor 19 and a corrosive liquid outlet valve 20, wherein the reaction kettle 15 is arranged on a box body 2, the heating heat preservation device 14 is arranged outside the reaction kettle 15 to heat the pressure kettle, the kettle cover and heat radiation seat 10 is arranged on the reaction kettle 15, the kettle cover heat preservation device 11 is arranged on the kettle cover and heat radiation seat 10, the kettle bottom heat preservation and support device 16 is arranged at the bottom of the reaction kettle 15, the kettle cover heat preservation device 11 and the kettle bottom heat preservation and support device 16 ensure that the temperature of the reaction kettle 15 is constant and controllable, the pressure gauge 8 and the temperature sensor 19 are used for measuring the temperature and the pressure in the reaction kettle in real time, the isolation valve 9 is arranged between the pressure gauge 8 and the reaction kettle 15, a first corrosive liquid inlet 13 is arranged at the upper part of the reaction kettle 15, a corrosive liquid outlet valve 20 is arranged at the lower part of the reaction kettle 15, corrosive media are pressed in through the first corrosive liquid inlet 13 before the experiment is started, and the corrosive media are discharged through the corrosive liquid outlet valve 20 after the experiment is finished;
a rotary sealing device 12 is arranged between the rotary shaft 17 and the reaction kettle 15, the rotary sealing device 12 adopts an inverted V-shaped structure, the rotary contact position of the rotary shaft 17 and the reaction kettle 15 is sealed, and the reaction kettle is ensured not to have pressure leakage in the process of high-speed rotation of the rotary shaft;
the high-pressure solution injection and pressure maintaining system comprises a piston container 21, a second corrosive liquid inlet 22, a control valve 23, an injection pump 24 and a pressurizing pedal 25, wherein the top of the piston container 21 is communicated with the first corrosive liquid inlet 13 through a pipeline, the side wall of the piston container 21 is provided with the second corrosive liquid inlet 22, corrosive media enter the piston container 21 from the second corrosive liquid inlet 22, the bottom of the piston container 21 is communicated with the injection pump 24 through a pipeline, the control valve 23 is arranged on the pipeline between the piston container 21 and the injection pump 24, the pressurizing pedal 25 is arranged on the injection pump 24, the corrosive media are pressed into the reaction kettle from the piston container 21 by pushing a piston through the injection pump by stepping the pressurizing pedal 25, and the control valve is closed to realize pressure maintaining after the injection;
the sample clamping device is composed of a reducing rod body and a nut, the reducing rod body is fixed at the front end of the rotating shaft 17, the sample 18 is a hollow cylinder with the inner diameter of 10mm and the outer diameter of 15mm, the diameter of the upper portion of the reducing rod body is 15mm, the diameter of the lower portion of the reducing rod body is 10mm, the lower end of the reducing rod body is provided with threads, the sample is stringed at the lower portion of the rod body, and the tail end of the sample is locked by the nut.
Specifically, the speed regulating motor 6 drives the rotating shaft 17 to rotate, the rotating shaft 17 drives the reducing rod body to rotate, the sample rotates in the reaction kettle 15 along with the reducing rod body, the simulation of the flow speed is realized, and the controllable regulation of the flow speed is realized by regulating the rotating speed of the speed regulating motor 6;
the reaction vessel 15 and the piston vessel 21 are made of corrosion resistant hastelloy steel.
To make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments are further described. For clarity of description and experimental parameter selection, the following assumptions were made:
1. neglecting the influence of the surface temperature, especially the temperature change along with the four seasons and the day and night alternation.
2. Assuming that the actual surface temperature is a constant, the local annual average temperature can be selected according to the actual drilling position, and 10 ℃ is adopted in the embodiment.
3. Assuming that the temperature gradient of the stratum below the earth surface is increased by 3 ℃/100m, the temperature gradient actually measured locally can be taken when the corrosion performance of the drilling tool material at a specific position is tested.
4. Neglecting hydrogen sulfide H2Influence of S on the pH of the drilling fluid corrosive liquid, i.e. assuming that the test environment does not contain H2S。
5. The simulated pressure is calculated according to the liquid column pressure of the depth of the stratum, and the density of the corrosion liquid in the embodiment is selected to be the clear water density.
6. Assuming an actual drilling environment, the friction, torque and pressure losses in the well are neglected, i.e. the rotational speed of the drilling rig can be equal to the actual drilling rate of the drilling tool in the well.
The first embodiment is as follows: the working conditions of 1500m petroleum drilling underground environment, formation temperature of about 55 ℃, rotating speed of 60r/min, liquid column pressure of 15MPa and drilling fluid pH value of 8 are simulated.
Firstly weighing a sample, stringing the sample on the lower part of a reducing rod body, locking the tail end of the reducing rod body by a nut, extending a rotating shaft 17 into a reaction kettle 15, installing a rotary sealing device 12, covering a kettle cover and a heat radiating seat 10, and placing a kettle cover heat preservation device 11.
The rotating rod 5 of the motor is horizontally rotated to enable the speed regulating motor 6 to reach a specified position to lock a horizontal nut, the rotating rod 5 of the motor is moved up and down to connect the rod body of the rotating rod with the speed regulating motor 6, a vertical nut is locked, and the position is fixed.
The drilling fluid with the pH value of 8 enters the piston container 21 from the second corrosive fluid inlet 22, the pressurizing pedal 25 is trampled, a piston is pushed by the injection pump 24 to press corrosive media into the reaction kettle 15 from the piston container 21, after the reaction kettle 15 is filled with the drilling fluid, the piston container 21 is still filled with the drilling fluid, the pressure in the reaction kettle 15 is further increased by injection, heating is started at the moment, the temperature reaches 55 ℃, the kettle bottom heat preservation and supporting device 16 is started to preserve heat, the pressure gauge 8 is observed at the same time, the injection is stopped when the pressure reaches 15MPa, and the control valve is closed to preserve the pressure.
And (4) turning on the speed regulating motor 6, regulating the rotating speed to 60r/min, presetting the experiment time to 96h, and carrying out the experiment.
After the test is finished, the speed regulating motor 6 and the kettle bottom heat preservation and support device 16 are closed, when the temperature is reduced to room temperature, the corrosive liquid outlet valve 20 is opened to release the pressure, the drilling fluid is discharged after the pressure is reduced to atmospheric pressure, the connection between the rotary shaft 17 and the speed regulating motor 6 is opened, the speed regulating motor 6 is moved to a proper position by the rotary rod 5 of the motor, the kettle cover and the heat dissipation seat 10 are opened, the rotary sealing device 12 is taken out, the rotary shaft 17 is taken out, the sample which is finished in the test is cleaned in a mixed solution of 200g/L chromic acid and 2g/L silver nitrate, the residual drilling fluid and the corrosion products on the surface are removed, and then the sample is weighed. And evaluating the corrosion performance by utilizing the weight loss before and after the corrosion, observing and evaluating the corrosion appearance of the surface of the sample, and further researching the corrosion behavior of the sample.
The second embodiment: the underground environment of a 3000m petroleum drilling well is simulated, the stratum temperature is about 100 ℃, the rotary table and a bottom hole screw drilling tool are driven in a combined mode, the rotating speed of the drilling tool is 120r/min, the liquid column pressure is 30MPa, and the pH value of the drilling fluid is 10.
Firstly weighing a sample, stringing the sample on the lower part of a reducing rod body, locking the tail end of the reducing rod body by a nut, extending a rotating shaft 17 into a reaction kettle 15, installing a rotary sealing device 12, covering a kettle cover and a heat radiating seat 10, and placing a kettle cover heat preservation device 11.
The rotating rod 5 of the motor is horizontally rotated to enable the speed regulating motor 6 to reach a specified position to lock a horizontal nut, the rotating rod 5 of the motor is moved up and down to connect the rod body of the rotating rod with the speed regulating motor 6, a vertical nut is locked, and the position is fixed.
The drilling fluid with the pH value of 10 enters the piston container 21 from the second corrosive fluid inlet 22, the pressurizing pedal 25 is trampled, a piston is pushed by the injection pump 24 to press corrosive media into the reaction kettle 15 from the piston container 21, after the reaction kettle 15 is filled with the drilling fluid, the piston container 21 is still filled with the drilling fluid, the pressure in the reaction kettle 15 is further increased by injection, heating is started at the moment, the temperature reaches 100 ℃, the kettle bottom heat preservation and supporting device 16 is started to preserve heat, the pressure gauge 8 is observed at the same time, the injection is stopped when the pressure reaches 30MPa, and the control valve is closed to preserve pressure.
And (4) turning on the speed regulating motor 6, regulating the rotation speed to 120r/min, presetting the experiment time to 96h, and carrying out the experiment.
After the test is finished, the speed regulating motor 6 and the kettle bottom heat preservation and support device 16 are closed, when the temperature is reduced to room temperature, the corrosive liquid outlet valve 20 is opened to release the pressure, the drilling fluid is discharged after the pressure is reduced to atmospheric pressure, the connection between the rotary shaft 17 and the speed regulating motor 6 is opened, the speed regulating motor 6 is moved to a proper position by the rotary rod 5 of the motor, the kettle cover and the heat dissipation seat 10 are opened, the rotary sealing device 12 is taken out, the rotary shaft 17 is taken out, the sample which is finished in the test is cleaned in a mixed solution of 200g/L chromic acid and 2g/L silver nitrate, the residual drilling fluid and the corrosion products on the surface are removed, and then the sample is weighed. And evaluating the corrosion performance by utilizing the weight loss before and after the corrosion, observing and evaluating the corrosion appearance of the surface of the sample, and further researching the corrosion behavior of the sample.
The third embodiment is as follows: the underground environment of a geological survey well of 1000m is simulated, the stratum temperature is about 40 ℃, the rotating speed of a drilling tool is 360r/min, the liquid column pressure is 10MPa, and the pH value of the drilling fluid is 7.5.
Firstly weighing a sample, stringing the sample on the lower part of a reducing rod body, locking the tail end of the reducing rod body by a nut, extending a rotating shaft 17 into a reaction kettle 15, installing a rotary sealing device 12, covering a kettle cover and a heat radiating seat 10, and placing a kettle cover heat preservation device 11.
The rotating rod 5 of the motor is horizontally rotated to enable the speed regulating motor 6 to reach a specified position to lock a horizontal nut, the rotating rod 5 of the motor is moved up and down to connect the rod body of the rotating rod with the speed regulating motor 6, a vertical nut is locked, and the position is fixed.
The drilling fluid with the pH value of 10 enters the piston container 21 from the second corrosive fluid inlet 22, the pressurizing pedal 25 is trampled, a piston is pushed by the injection pump 24 to press corrosive media into the reaction kettle 15 from the piston container 21, after the reaction kettle 15 is filled with the drilling fluid, the piston container 21 is still filled with the drilling fluid, the pressure in the reaction kettle 15 is further increased by injection, heating is started at the moment, the temperature reaches 40 ℃, the kettle bottom heat preservation and supporting device 16 is started to preserve heat, the pressure gauge 8 is observed at the same time, the injection is stopped when the pressure reaches 10MPa, and the control valve is closed to preserve the pressure.
And (4) turning on the speed regulating motor 6, regulating the rotation speed to 360r/min, presetting the experiment time to be 24h, and carrying out the experiment.
After the test is finished, the speed regulating motor 6 and the kettle bottom heat preservation and support device 16 are closed, when the temperature is reduced to room temperature, the corrosive liquid outlet valve 20 is opened to release the pressure, the drilling fluid is discharged after the pressure is reduced to atmospheric pressure, the connection between the rotary shaft 17 and the speed regulating motor 6 is opened, the speed regulating motor 6 is moved to a proper position by the rotary rod 5 of the motor, the kettle cover and the heat dissipation seat 10 are opened, the rotary sealing device 12 is taken out, the rotary shaft 17 is taken out, the sample which is finished in the test is cleaned in a mixed solution of 200g/L chromic acid and 2g/L silver nitrate, the residual drilling fluid and the corrosion products on the surface are removed, and then the sample is weighed. And evaluating the corrosion performance by utilizing the weight loss before and after the corrosion, observing and evaluating the corrosion appearance of the surface of the sample, and further researching the corrosion behavior of the sample.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (2)
1. The utility model provides a drilling tool material corrosion test platform under simulation drilling environment which characterized in that: the device comprises a control cabinet, a rotary power system, a high-temperature high-pressure reaction kettle system, a high-pressure solution injection and pressure maintaining system and a sample clamping device, wherein the rotary power system is arranged on the control cabinet;
the control cabinet comprises a control panel (1), a box body (2) and a fixed base (3), wherein the box body (2) is used for placing a reaction kettle (15) and a control circuit, the fixed base (3) is fixed on the ground, the box body (2) is fixedly arranged on the fixed base (3), and the control panel (1) is used for controlling and displaying the temperature and the pressure of the reaction kettle (15) and the rotating speed of a speed regulating motor (6);
the rotary power system comprises a motor rotary support (4), a motor rotary rod (5), a speed regulating motor (6), a motor fixing device (7) and a rotary shaft (17), wherein the motor rotary support (4) is fixed on the box body (2), the motor rotary rod (5) is movably connected with the motor rotary support (4), the motor rotary rod (5) can slide up and down and horizontally rotate along the motor rotary support (4), the motor rotary rod (5) is locked and fixed on the motor rotary support (4) through a nut mechanism, the speed regulating motor (6) is fixed on the motor rotary rod (5) and can lift in the vertical direction and twist in the horizontal direction along with the motor rotary rod (5), the rotary shaft (17) is detachably connected with the speed regulating motor (6), and the rotary shaft (17) drives a sample to rotate in a corrosive medium in the reaction kettle (15) to simulate the flow rate, the speed regulating motor (6) regulates the rotating speed to change the magnitude of the simulated flow speed;
the high-temperature high-pressure reaction kettle system comprises a pressure gauge (8), an isolating valve (9), a kettle cover and heat radiating seat (10), a kettle cover heat preservation device (11), a first corrosive liquid inlet (13), a heating heat preservation device (14), a reaction kettle (15), a kettle bottom heat preservation and supporting device (16), a temperature sensor (19) and a corrosive liquid outlet valve (20), wherein the reaction kettle (15) is arranged on a box body (2), the heating heat preservation device (14) is arranged outside the reaction kettle (15) to heat the pressure kettle, the kettle cover and the heat radiating seat (10) are arranged on the reaction kettle (15), the kettle cover heat preservation device (11) is arranged on the kettle cover and the heat radiating seat (10), the kettle bottom heat preservation and supporting device (16) is arranged at the bottom of the reaction kettle (15), the temperature of the reaction kettle (15) is kept constant and controllable by the kettle cover heat preservation device (11) and the kettle bottom heat preservation and supporting device (16), the pressure gauge (8) and the temperature sensor (19) are used for measuring the temperature and the pressure in the reaction kettle in real time, an isolation valve (9) is arranged between the pressure gauge (8) and the reaction kettle (15), a first corrosive liquid inlet (13) is arranged at the upper part of the reaction kettle (15), a corrosive liquid outlet valve (20) is arranged at the lower part of the reaction kettle (15), a corrosive medium is pressed in through the first corrosive liquid inlet (13) before an experiment is started, and is discharged through the corrosive liquid outlet valve (20) after the experiment is finished;
a rotary sealing device (12) is arranged between the rotary shaft (17) and the reaction kettle (15), the rotary sealing device (12) adopts an inverted V-shaped structure, the rotary contact position of the rotary shaft (17) and the reaction kettle (15) is sealed, and the reaction kettle is ensured not to have pressure leakage in the process of high-speed rotation of the rotary shaft;
the high-pressure solution injection and pressure maintaining system comprises a piston container (21), a second corrosive liquid inlet (22), a control valve (23), an injection pump (24) and a pressurizing pedal (25), the top of a piston container (21) is communicated with a first corrosive liquid inlet (13) through a pipeline, a second corrosive liquid inlet (22) is formed in the side wall of the piston container (21), corrosive media enter the piston container (21) through the second corrosive liquid inlet (22), the bottom of the piston container (21) is communicated with an injection pump (24) through a pipeline, a control valve (23) is arranged on the pipeline between the piston container (21) and the injection pump (24), a pressurizing pedal (25) is arranged on the injection pump (24), the corrosive media are pressed into a reaction kettle from the piston container (21) by pushing a piston through the injection pump by stepping on the pressurizing pedal (25), and the control valve is closed to realize pressure maintaining after the injection is finished;
the sample clamping device is composed of a reducing rod body and a nut, the reducing rod body is fixed at the front end of a rotating shaft (17), a sample (18) is a hollow cylinder with the inner diameter of 10mm and the outer diameter of 15mm, the diameter of the upper portion of the reducing rod body is 15mm, the diameter of the lower portion of the reducing rod body is 10mm, the lower end of the reducing rod body is provided with threads, the sample is stringed at the lower portion of the rod body, and the tail end of the sample is locked by the nut.
2. The drill tool material corrosion test stand for simulating a drilling environment according to claim 1, wherein: the reaction vessel (15) and the piston vessel (21) are made of corrosion-resistant Ha-type steel.
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