CN111198153A - Scaling corrosion rate evaluation system for gas well oil casing - Google Patents
Scaling corrosion rate evaluation system for gas well oil casing Download PDFInfo
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- CN111198153A CN111198153A CN202010028763.2A CN202010028763A CN111198153A CN 111198153 A CN111198153 A CN 111198153A CN 202010028763 A CN202010028763 A CN 202010028763A CN 111198153 A CN111198153 A CN 111198153A
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Abstract
The invention provides a system for evaluating the scaling corrosion rate of an oil casing of a gas well, which comprises the following components: the device comprises a reaction kettle, a stirring device detachably connected with the reaction kettle, a vacuumizing device communicated with the interior of the reaction kettle, an air inlet device communicated with the interior of the reaction kettle, a pulley assembly connected with the stirring device, a heating device used for heating the reaction kettle, a temperature monitoring device used for monitoring the temperature of the interior of the reaction kettle, a pressure sensor used for monitoring the pressure of the interior of the reaction kettle and a liquid discharge valve arranged on the reaction kettle; the reaction kettle is provided with a sample inlet, and a sample rack is arranged below the interior of the reaction kettle; the stirring device comprises a rotating motor and a stirring piece connected with the rotating motor, the stirring device extends into the reaction kettle through the sample inlet, and the pulley component drives the stirring device to lift. The invention is suitable for high-temperature and high-pressure dynamic scaling corrosion experiments, can simultaneously consider scaling and corrosion of stratum water to the pipe column, and is used for evaluating the corrosion and scaling rate of oil field produced liquid to the pipe column.
Description
Technical Field
The invention relates to the field of gas well production equipment, in particular to a system for evaluating the scaling corrosion rate of a gas well oil casing.
Background
Along with increasing attention on environmental protection and shortage of water resources, oil field water injection is increasingly reinjected by oil extraction sewage. However, the oil extraction wastewater contains a large amount of Ca2+、Ba2+、SO4 2-Easily form CaCO during recycling3、CaSO4、BaSO4Scale, causingThe diameter of the pipeline is reduced, the flow cross section area is reduced, and pressure loss is caused. Pipeline scaling also tends to cause under-scale corrosion, which in the severe cases causes pipeline blockage. Carbonate scale is easier to handle, while sulfate scale is difficult to remove by traditional methods due to its compact structure and high hardness.
Oil casing fouling and corrosion caused by wellbore fluid accumulation generated in the gas well production process seriously affect the service life of the gas well. In addition, natural gas contains a certain amount of CO2、H2S, and H ionized by dissolving in water+Will corrode the tube wall to produce FeCO3Insoluble corrosion products such as FeS and the like are attached to the pipe wall, so that the flow of the gas well is reduced, and the normal production of the gas well is influenced. Therefore, the simulation of the scaling and corrosion processes in the tubular column under different temperature and pressure conditions and the performance evaluation of the corrosion and scale inhibitor are very important.
At present, the standard of the petroleum industry recommends a static method to evaluate the scaling rate of oil field water and the corrosion inhibition efficiency of a corrosion inhibitor, namely, a certain amount of oil field water produced liquid and a scale inhibitor are mixed according to a certain proportion and heated to the formation temperature for a period of time, and then the scaling efficiency is evaluated by comparing the scaling degrees of the oil field water added with different scale inhibitors. The static evaluation method is simple in process and easy to implement, but the scaling difference caused by the flowing of the fluid cannot be considered, and in addition, the scaling phenomenon caused by bottom hole accumulated liquid in the production process of the natural gas well can also influence the H in the water+The corrosion of ions to the production string is in the oilfield field, scaling and corrosion inside the production string often occur simultaneously, and a static scaling rate evaluation method and simple dynamic corrosion cannot reflect the actual corrosion of the shaft and the scaling field.
Disclosure of Invention
The invention provides a scaling corrosion rate evaluation system for an oil casing of a gas well, aiming at solving the technical problem that the influence of scaling and corrosion of formation water cannot be considered simultaneously when the existing equipment is used for measurement.
The specific technical scheme is as follows:
the system for evaluating the scaling corrosion rate of the oil casing of the gas well is characterized by comprising the following components in percentage by weight: the device comprises a reaction kettle, a stirring device detachably connected with the reaction kettle, a vacuumizing device communicated with the interior of the reaction kettle, an air inlet device communicated with the interior of the reaction kettle, a pulley assembly connected with the stirring device, a heating device used for heating the reaction kettle, a temperature monitoring device used for monitoring the temperature of the interior of the reaction kettle, a pressure sensor used for monitoring the pressure of the interior of the reaction kettle and a liquid discharge valve arranged on the reaction kettle;
the reaction kettle is provided with a sample inlet, and a sample rack is arranged below the reaction kettle;
the stirring device comprises a rotating motor and a stirring piece connected with the rotating motor, the stirring device extends into the reaction kettle through the sample inlet, and the pulley component drives the stirring device to lift.
Further, the system for evaluating the scaling corrosion rate of the gas well oil casing further comprises a control device and a speed inductor, wherein the speed inductor is connected between the control device and the rotating motor; the temperature monitoring device and the pressure sensor are connected with the control device; the control device comprises a temperature sensor, and the temperature sensor is connected with the heating device and the temperature monitoring device.
Further, be connected with reation kettle sealing head between rotating electrical machines with the stirring piece, reation kettle sealing head will the sample entry seals.
Further, the vacuumizing device comprises a vacuum pump, a buffer tank and a communicating pipe; the communicating pipe is communicated with the vacuum pump, the buffer tank and the reaction kettle, and a three-way valve, a vacuumizing valve and an air outlet valve are installed on the communicating pipe between the buffer tank and the reaction kettle.
Further, the pulley assembly comprises a pulley assembly channel, a balance head arranged in the pulley assembly channel, a pulley arranged in the pulley assembly channel and a connecting line for connecting the balance head with the pulley.
Further, the air inlet device comprises a one-way valve and an air inlet valve which are arranged at the bottom of the reaction kettle, and the one-way valve is connected with the air inlet valve.
Furthermore, the reaction kettle sealing head is provided with a through hole, the stirring piece is connected with the reaction kettle sealing head through a connecting piece matched with the through hole, and the connecting piece is arranged in the through hole;
the connecting piece is provided with a stirring piece connecting hole matched with the stirring piece and communicating pipe connecting holes respectively arranged on two sides of the stirring piece connecting hole, and the communicating pipes are communicated with the vacuum pump and the reaction kettle by connecting one side of the communicating pipe connecting holes.
Further, the heating device comprises a heat insulation layer wrapped on the outer wall of the reaction kettle and a heating resistance wire arranged on the outer wall of the reaction kettle, and the heating resistance wire is connected with the temperature sensor.
Further, the reaction kettle was made of 316L steel.
Further, the system for evaluating the scaling corrosion rate of the gas well oil casing further comprises an installation frame, the reaction kettle, the stirring device, the vacuumizing device, the air inlet device, the pulley assembly, the heating device, the temperature monitoring device, the pressure sensor and the control device are all installed on the installation frame, and rollers are installed at the bottom of the installation frame.
Compared with the prior art, the invention has the beneficial effects that: (1) the device is suitable for high-temperature and high-pressure dynamic scaling corrosion experiments, and can be used for evaluating the corrosion and scaling rate of the produced liquid of the oil field to the pipe column by setting the sample frame in consideration of the scaling and corrosion of the formation water to the pipeline; (2) obtaining different fluid relative speeds, further discussing the influence of the speeds of different fluids relative to the pipeline on the scaling and corrosion rates of the pipeline, and accurately controlling the relative speeds; (3) the real temperature and pressure of the oil field can be simulated, and the testing precision is improved.
Drawings
FIG. 1 is a diagram of a system for evaluating the scaling corrosion rate of a gas well oil casing;
FIG. 2 is a view of the connector structure;
a reaction kettle-1, a stirring device-2, a vacuumizing device-3, an air inlet device-4, a pulley assembly-5, a heating device-6, a temperature monitoring device-7, a pressure sensor-8, a control device-9, a speed sensor-10, a mounting rack-11, a sample-12, a liquid discharge valve-101, a sample inlet-102, a sample rack-103, a rotating motor-201, a stirring piece-202, a reaction kettle sealing head-203, a perforation-2031, a connecting piece-204, a stirring piece connecting hole-2041, a communicating pipe connecting hole-2042, a vacuum pump-301, a buffer tank-302, a communicating pipe-303, a three-way valve-304, a vacuumizing valve-305, an air outlet valve-306 and a one-way valve-401, an air inlet valve-402, a pulley assembly channel-501, a balance head-502, a pulley-503, a connecting line-504, a heat insulation layer-601, a resistance wire-602, a rotating speed display-901, a temperature sensor-902 and a roller-1101.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Examples
A gas well oil casing scaling corrosion rate evaluation system comprises: reation kettle 1, with reation kettle 1 can dismantle agitating unit 2 of connection, with the evacuating device 3 of the inside intercommunication of reation kettle 1, with the air inlet unit 4 of the inside intercommunication of reation kettle 1, with pulley assembly 5 that agitating unit 2 is connected, be used for heating reation kettle 1's heating device 6, be used for the control reation kettle internal temperature's temperature monitoring device 7, be used for the control reation kettle internal pressure's pressure sensor 8 and setting are in tapping valve 101 on reation kettle 1, temperature monitoring device 7 is temperature probe.
The reaction kettle 1 is provided with a sample inlet 102, and a sample rack 103 is arranged below the reaction kettle 1; a certain space is formed between the test sample 12 and the kettle bottom of the reaction kettle 1, and the corrosive liquid is at the kettle bottom of the reaction kettle 1 during detection so as to investigate the influence of accumulated liquid at the bottom of the kettle on the actual scale formation and corrosion of a shaft.
The stirring device 2 comprises a rotating motor 201 and a stirring piece 202 connected with the rotating motor 201, the stirring device 2 extends into the reaction kettle 1 through the sample inlet 102, the pulley assembly 5 drives the stirring device 2 to lift, and the pulley assembly 5 comprises a pulley assembly channel 501, a balance head 502 arranged in the pulley assembly channel 501, a pulley 503 arranged in the pulley assembly channel 501 and a connecting line 504 connecting the balance head 502 and the pulley 503.
The system for evaluating the scaling corrosion rate of the oil casing of the gas well further comprises a control device 9 and a speed sensor 10, wherein the control device 9 comprises a temperature sensor 902 and a rotating speed display 901, and the speed sensor 10 is connected between the rotating speed display 901 of the control device 9 and the rotating motor 201; the pressure sensor 8 is connected to the control device 9, and the temperature monitoring device 7 is connected to the temperature sensor 902.
The rotary motor 201 with be connected with reation kettle seal head 203 between the stirring piece 202, reation kettle head 203 is connected with reation kettle 1 with helicitic texture, reation kettle seal head 203 will sample entry 102 seals to this guarantees reation kettle 1's sealed environment.
The vacuum pumping device 3 comprises a vacuum pump 301, a buffer tank 302 and a communicating pipe 303; the communicating pipe 303 communicates the vacuum pump 301, the buffer tank 302 and the reaction kettle 1, a three-way valve 304, a vacuum pumping valve 305 and an air outlet valve 306 are installed on the communicating pipe between the buffer tank 302 and the reaction kettle 1, the vacuum pumping device 2 can realize the relative motion between the static sample and multiple groups of media under the vacuum condition, and the vacuum pump 301 can provide the vacuum environment.
The air inlet device 4 comprises a one-way valve 401 and an air inlet valve 402 which are arranged at the bottom of the reaction kettle 1, and the one-way valve 401 is connected with the air inlet valve 402.
The reaction kettle sealing head 203 is provided with a through hole 2031, the stirring piece 202 is connected with the reaction kettle sealing head 203 through a connecting piece 204 matched with the through hole 2031, and the connecting piece 204 is arranged in the through hole;
connecting piece 204 seted up with stirring piece 202 matched with stirring piece connecting hole 2041 and separately locate the communicating pipe connecting hole 2042 of stirring piece connecting hole 2041 both sides, communicating pipe is through connecting one of them side communicating pipe connecting hole 2042 intercommunication vacuum pump 301 with reation kettle 1, be connected with communicating pipe 303 between opposite side communicating pipe connecting hole 2042 and pressure sensor 8.
The test gas (gas in the production of the simulated gas well) enters from the gas inlet valve 402 and then flows through the communicating pipe connecting hole 2042.
The heating device 6 comprises a heat insulation layer 601 wrapped on the outer wall of the reaction kettle 1 and a heating resistance wire 602 arranged on the outer wall of the reaction kettle 1, the heating resistance wire 602 is connected with the temperature sensor 902, and the reaction heating device 6 is combined with the temperature monitoring device 7 to control the temperature inside the reaction kettle 1.
The reaction kettle has the volume of 700ml, is made of 316L steel, is resistant to carbon dioxide corrosion, and has the highest pressure bearing capacity of 32MPa and the highest working temperature of 180 ℃.
The gas well oil casing scaling corrosion rate evaluation system further comprises an installation frame, the reaction kettle 1, the stirring device 2, the vacuumizing device 3, the air inlet device 4, the pulley assembly 5, the heating device 6, the temperature monitoring device 7, the pressure sensor 8 and the control device 9 are all installed on the installation frame 11, and rollers 1101 are installed at the bottom of the installation frame 11.
The use method of the invention comprises the following steps:
during operation, firstly, the reaction kettle 1 is cleaned, a corrosive medium is added into the reaction kettle 1, then, a clean cylindrical sample 12 is weighed and then is placed into the reaction kettle 1, after the sample is stably placed, the heating device 6 is opened, the temperature is adjusted to an experimental temperature, the rotating speed of the stirring piece 202 is adjusted to an experimental speed, the gas outlet valve 306 and the gas inlet valve 402 are closed, the vacuumizing valve 305 is opened, then, the vacuum pump 301 is started, after vacuumizing for 1h, the vacuum pump and the vacuumizing valve 305 are closed, the pressure of the reaction kettle is increased to an experimental pressure, then, the gas speed of the gas inlet valve 402 is adjusted, gas circulates in the reaction kettle 1, after a period of reaction, the pulley assembly 5 is lifted, the stirring device 2 is taken out, the liquid discharge valve 101 is opened, corrosive liquid is discharged, the cylindrical sample is taken out and weighed, and the scaling and corrosion rate are.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A system for evaluating the scaling corrosion rate of an oil casing of a gas well is characterized by comprising the following components: the device comprises a reaction kettle (1), a stirring device (2) detachably connected with the reaction kettle (1), a vacuumizing device (3) communicated with the interior of the reaction kettle (1), an air inlet device (4) communicated with the interior of the reaction kettle (1), a pulley assembly (5) connected with the stirring device (2), a heating device (6) used for heating the reaction kettle (1), a temperature monitoring device (7) used for monitoring the temperature in the reaction kettle, a pressure sensor (8) used for monitoring the pressure in the reaction kettle (1) and a liquid discharge valve (101) arranged on the reaction kettle (1);
the reaction kettle (1) is provided with a sample inlet (102), and a sample rack (103) is arranged below the reaction kettle (1);
the stirring device (2) comprises a rotating motor (201) and a stirring piece (202) connected with the rotating motor (201), the stirring device (2) extends into the reaction kettle (1) through the sample inlet (102), and the pulley component (5) drives the stirring device (2) to lift.
2. A gas well oil casing scaling corrosion rate evaluation system as claimed in claim 1, characterized in that the gas well oil casing scaling corrosion rate evaluation system further comprises a control device (9) and a speed sensor (10), the speed sensor (10) being connected between the control device (9) and the rotary electric machine (201); the temperature monitoring device (7) and the pressure sensor (8) are connected with the control device (9); the control device (9) comprises a temperature sensor (902), and the temperature sensor (902) is connected with the heating device (6) and the temperature monitoring device (7).
3. The system for evaluating the scaling corrosion rate of the oil well casing of the gas well as the method as claimed in claim 1, characterized in that a reaction vessel sealing head (203) is connected between the rotating motor (201) and the stirring member (202), and the reaction vessel sealing head (203) seals the sample inlet (102).
4. The scaling corrosion rate evaluation system for the oil well casing of the gas well as recited in claim 1, characterized in that the vacuum pumping device (3) comprises a vacuum pump (301), a buffer tank (302) and a communicating pipe (303); communicating pipe (303) intercommunication vacuum pump (301), buffer tank (302) and reation kettle (1), three-way valve (304), evacuation valve (305) and air outlet valve (306) are installed to buffer tank (302) with communicating pipe between reation kettle (1).
5. The gas well oil casing scaling corrosion rate evaluation system as claimed in claim 1, characterized in that the pulley assembly (5) comprises a pulley assembly passage (501), a balance head (502) arranged inside the pulley assembly passage (501), a pulley (503) arranged inside the pulley assembly passage (501), and a connecting line (504) connecting the balance head (502) and the pulley (503).
6. Gas well oil casing scaling corrosion rate evaluation system according to claim 1, characterized in that the air inlet device (4) comprises a one-way valve (401) and an air inlet valve (402) arranged at the bottom of the reaction kettle (1), and the one-way valve (401) is connected with the air inlet valve (402).
7. Gas well oil casing scaling corrosion rate evaluation system according to claim 2 or 3 or 4, characterized in that the reactor head (203) is provided with a perforation (2031), the stirring element (202) is connected with the reactor head (203) through a connecting element (204) matched with the perforation (2031), and the connecting element (204) is arranged in the perforation (2031);
connecting piece (204) seted up with stirring piece (202) matched with stirring piece connecting hole (2041) and branch locate stirring piece connecting hole (2041) both sides communicating pipe connecting hole (2042), communicating pipe (303) are through connecting one of them side communicating pipe connecting hole (2042) intercommunication vacuum pump (301) with reation kettle (1).
8. The gas well oil casing scaling corrosion rate evaluation system as claimed in claim 2, characterized in that the heating device (6) comprises an insulating layer (601) wrapped on the outer wall of the reaction kettle (1) and a heating resistance wire (602) arranged on the outer wall of the reaction kettle (1), wherein the heating resistance wire (602) is connected with the temperature sensor (902).
9. Gas well oil casing scaling corrosion rate evaluation system according to claim 1, characterized in that the reaction vessel (1) is made of 316L steel.
10. The system for evaluating the scaling corrosion rate of the oil well casing of the gas well according to claim 2, characterized by further comprising a mounting rack (11), wherein the reaction kettle (1), the stirring device (2), the vacuumizing device (3), the air inlet device (4), the pulley assembly (5), the heating device (6), the temperature monitoring device (7), the pressure sensor (8) and the control device (9) are all mounted on the mounting rack (11), and rollers (1101) are mounted at the bottom of the mounting rack (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010028763.2A CN111198153A (en) | 2020-01-11 | 2020-01-11 | Scaling corrosion rate evaluation system for gas well oil casing |
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| CN202010028763.2A CN111198153A (en) | 2020-01-11 | 2020-01-11 | Scaling corrosion rate evaluation system for gas well oil casing |
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