CN116816312A - CO 2 Oil well corrosion prevention method for bottom water-flooding sandstone reservoir and corrosion inhibitor injection device - Google Patents
CO 2 Oil well corrosion prevention method for bottom water-flooding sandstone reservoir and corrosion inhibitor injection device Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 381
- 230000007797 corrosion Effects 0.000 title claims abstract description 374
- 239000003112 inhibitor Substances 0.000 title claims abstract description 194
- 239000003129 oil well Substances 0.000 title claims abstract description 116
- 238000002347 injection Methods 0.000 title claims abstract description 100
- 239000007924 injection Substances 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000005536 corrosion prevention Methods 0.000 title claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 121
- 239000007788 liquid Substances 0.000 claims abstract description 72
- 239000007769 metal material Substances 0.000 claims abstract description 29
- 238000011068 loading method Methods 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 69
- 229910052751 metal Inorganic materials 0.000 claims description 61
- 239000002184 metal Substances 0.000 claims description 61
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 50
- 238000001514 detection method Methods 0.000 claims description 45
- 238000012360 testing method Methods 0.000 claims description 45
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 238000003860 storage Methods 0.000 claims description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 25
- 239000001569 carbon dioxide Substances 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 24
- 239000011259 mixed solution Substances 0.000 claims description 19
- 239000010779 crude oil Substances 0.000 claims description 17
- 230000010365 information processing Effects 0.000 claims description 14
- 238000005086 pumping Methods 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000004945 emulsification Methods 0.000 claims description 3
- 230000001804 emulsifying effect Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 2
- 241000667922 Ougeinia dalbergioides Species 0.000 claims 1
- 239000011435 rock Substances 0.000 claims 1
- 238000004088 simulation Methods 0.000 abstract description 2
- 235000019198 oils Nutrition 0.000 description 59
- 239000000463 material Substances 0.000 description 22
- 238000010438 heat treatment Methods 0.000 description 15
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 238000012795 verification Methods 0.000 description 6
- 230000035484 reaction time Effects 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
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- 230000001276 controlling effect Effects 0.000 description 3
- 238000011835 investigation Methods 0.000 description 3
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- 235000019476 oil-water mixture Nutrition 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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- Mining & Mineral Resources (AREA)
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Abstract
The application discloses a CO 2 Oil well corrosion prevention method for driving bottom water sandstone oil reservoir and corrosion inhibitor injection device, comprising the steps of determining CO 2 The method comprises the steps of (1) a metal material which is used for an oil well of a bottom water sandstone reservoir and needs to be preserved; simulation of CO 2 Driving working conditions of a bottom water sandstone oil reservoir and determining corrosion factors; determining corrosion resistance of a metal material used in an oil well under different corrosion conditions; selecting a corrosion inhibitor according to corrosion resistance and loading the corrosion inhibitor into a corrosion inhibitor injection device, and combining the corrosion resistance of a metal material under different corrosion conditions and the produced liquid in the current set time periodThe corrosion condition is used for determining the concentration required to be reached by the corrosion inhibitor in the produced liquid in the current set time period; and further determining and adjusting the injection quantity and the injection speed of the corrosion inhibitor in the next adjacent set time period so as to ensure that the corrosion rate of the oil well is less than 0.076mm/a. The CO disclosed by the application 2 The oil well corrosion prevention method for the bottom water-flooding sandstone reservoir can effectively solve the problem of CO 2 The oil well corrosion prevention problem of the bottom water-flooding sandstone oil reservoir provides technical support for exploitation of the oil reservoir.
Description
Technical Field
The application belongs to the field of petroleum exploitation, and in particular relates to a CO 2 An oil well corrosion prevention method and a slow release agent injection device for a bottom water-flooding sandstone oil reservoir.
Background
This section provides merely background information related to the application, which is not necessarily prior art.
The bottom water sandstone reservoir belongs to a back-inclined, medium-pore and medium-high permeability sandstone reservoir, and is mainly developed in a horizontal well. The distribution of the bottom water sandstone oil reservoirs at home and abroad is wide, most of the oil reservoirs are in the development stage of high water content at present, the flooding of the oil well is serious, and most of the bottom water sandstone oil reservoirs are stopped or abandoned due to lack of effective treatment means. Recently, a carbon dioxide oil displacement pilot test of the bottom water sandstone oil reservoir is successful, and the test proves that the carbon dioxide oil displacement technology has a good effect on exploitation of the bottom water sandstone oil reservoir. However, bottom water sandstone reservoirs often have high water content (some well groups have a combined water content of up to 93%), high salt content (some well groups have mineralization of 20-21×104mg/L, cl) - The content is 6.8-12×104 mg/L), high temperature (97-110deg.C), low pH (pH 5.8-6.1), and so on, and therefore, CO 2 The oil well corrosion prevention method of the bottom water-flooding sandstone oil reservoir becomes a key whether the oil reservoir can be successfully exploited.
In the practical oil well corrosion prevention research process, CO with different temperatures, different media and different ion contents 2 The corrosion rules and mechanisms are different, the corrosion mechanism is quite complex, and even the same oil well is at the same position, the corrosion conditions can be changed greatly along with the change of time. The high-temperature, high-salt and low-pH value bottom water sandstone oil reservoir has a very special corrosion environment, and related corrosion mechanism research is not performed in the environment, so that CO is given 2 The oil well corrosion prevention work of the bottom water-flooding sandstone reservoir brings great trouble and also gives CO 2 Exploitation of the drive-bottom water sandstone reservoir presents a significant challenge.
Currently aimed at CO 2 The corrosion resistance of the oil well driving the bottom water sandstone reservoir is not betterIn order to solve the corrosion prevention problem, the corrosion prevention effect of the oil well can be achieved only by increasing the amount of the corrosion inhibitor, thus greatly increasing CO 2 The cost of oil well corrosion prevention of the drive-bottom water sandstone reservoir is increased, thereby increasing the exploitation cost of such reservoirs.
Disclosure of Invention
The application provides a CO 2 Oil well corrosion prevention method for driving bottom water sandstone reservoir and slow release agent injection device, and aims to solve CO (carbon monoxide) 2 The oil well corrosion prevention problem of the bottom water-flooding sandstone oil reservoir provides technical support for exploitation of the oil reservoir. The aim is achieved by the following technical scheme:
In a first aspect, the present application provides a CO 2 An oil well corrosion prevention method for a bottom water-flooding sandstone oil reservoir comprises the following steps:
s1: determination of CO 2 The method comprises the steps of (1) a metal material which is used for an oil well of a bottom water sandstone reservoir and needs to be preserved;
s2: preparing a metal sample according to the metal material determined in S1, and simulating CO 2 Corrosiveness test is carried out under the working condition of the flooding bottom water sandstone oil reservoir, and the metal sample is determined to be in CO 2 Corrosion factors of oil wells driving the bottom water sandstone reservoir;
s3: according to the corrosion factors determined in the step S2, determining the corrosion resistance of the metal materials used in the oil well under different corrosion conditions;
s4: selecting a corrosion inhibitor according to the corrosion resistance of the metal material used by the oil well under different corrosion conditions, and loading the selected corrosion inhibitor into a corrosion inhibitor injection device;
s5: determining the concentration required to be reached by the corrosion inhibitor in the produced liquid in the current set time period by combining the corrosion resistance of the metal material under different corrosion conditions and the corrosion conditions of the produced liquid in the current set time period;
s6: and (3) determining and adjusting the injection quantity and the injection speed of the corrosion inhibitor injection device in the next set time period according to the concentration required to be achieved by the corrosion inhibitor in the produced liquid in the current set time period determined in the step (S5) so as to enable the corrosion rate of the oil well to be smaller than 0.076mm/a (millimeter/year).
The application is realized by determiningCO 2 Metallic material to be preserved for oil well of bottom water-flooding sandstone reservoir, and corresponding metallic material is used as sample to simulate CO 2 Corrosiveness test is carried out on working condition environment of the bottom water-flooding sandstone oil reservoir, and CO is further determined 2 And (3) driving corrosion factors of oil wells of the bottom water sandstone reservoir, and carrying out CO based on the corrosion factors 2 The corrosion proof basis of the oil well for driving the bottom water sandstone reservoir can further solve the problem of CO 2 The corrosion prevention problem of the oil well of the oil reservoir of the driving bottom water sandstone can be solved more scientifically by the formulated corrosion prevention method, and technical support can be provided for the exploitation of a large number of stopped and abandoned oil reservoirs.
In addition, the application is realized by the method for preparing the CO 2 The corrosion of the oil well of the oil reservoir of the bottom water sandstone is researched, the analysis of the corrosion condition of the produced liquid is combined, so that the concentration of the corrosion inhibitor required by the oil well of the oil reservoir is determined, the injection quantity and the injection speed of the corrosion inhibitor in the next set time period are further determined according to the mode of adding the corrosion inhibitor, and the corrosion inhibitor injection device is controlled, so that the problems of higher exploitation cost and the like caused by a method of blindly increasing the corrosion inhibitor are avoided.
As some preferred embodiments of the application, the corrosion factors determined in the S2 step further comprise temperature and CO 2 Partial pressure, flow rate and crude water content; the metal sample is at least one of a sample made of P110S steel, a sample made of P110-13Cr steel, a sample made of P110 steel, and a sample made of N80 steel.
As some preferred embodiments of the present application, further optionally in step S2, the temperature is selected in the range of 35 ℃ to 120 ℃; and/or, causing the CO to 2 The partial pressure is selected within the range of 0.5MPa-2.0MPa; and/or, the flow rate is selected to be in the range of 0.5m/s-2..0m/s; and/or, the water content of the crude oil is selected to be 20% -95%.
As some preferred embodiments of the present application, step S3 further includes selectively:
s31: uniformly mixing crude oil and water according to a set proportion to form an oil-water mixed solution, and filling the oil-water mixed solution and a metal sample into a reaction container;
s32: adjusting the temperature in the reaction vessel to a set temperature and adjusting the pressure in the reaction vessel to a set pressure;
s33: adjusting the flow rate of the oil-water mixed solution in the reaction container according to the set flow rate;
S34: reacting the weighed metal sample for a set period of time at a set temperature, a set pressure and a set flow rate;
s35: taking out the reacted metal sample, and cleaning, drying and weighing the metal sample;
s36: and determining the corrosion rate of the metal sample according to the difference of the quality of the metal sample before and after the reaction.
The application adjusts the temperature and the pressure in the reaction vessel before the CO 2 Is fed into the oil-water mixed solution, so that CO can be more truly simulated 2 The corrosion environment of the bottom water-flooding sandstone reservoir is avoided, the influence of oxygen on the test result is avoided, and the research result is more objective and scientific. In addition, CO can be added into the oil-water mixture 2 The test results of (2) are compared, and then the CO can be reflected 2 The corrosion degree of the oil well is CO 2 The anti-corrosion work of the oil displacement oil well provides guidance or reference.
As some preferred embodiments of the present application, further optionally in step S5, the concentration of corrosion inhibitor required to be achieved in the produced liquid for the current set period of time is calculated according to the following formula:
wherein: c is the concentration of the corrosion inhibitor in the produced liquid;
beta is a correction coefficient;
v is the corrosion rate of the produced liquid to the oil well in the detected current set time period;
a is the percentage of carbon dioxide in the produced liquid in the current set time period;
η is the water content in the produced liquid in the current set time period;
C 0 the corrosion inhibitor concentration required for the oil well to reach 0.076mm/a at the corrosion rate.
The method can estimate the concentration required to be reached by the corrosion inhibitor in the produced liquid in the current set time period through the formula, and further can estimate the injection quantity and the injection speed of the corrosion inhibitor in the next set time period according to the value. Based on the formula, the corrosion inhibitor injection device can correct the injection amount and the injection speed of the corrosion inhibitor according to the actual analysis condition of the produced liquid. Through verification, the injection quantity and the injection speed are estimated by adopting the calculation formula, and compared with the traditional corrosion inhibitor injection method, the corrosion inhibitor has the advantages that the better corrosion prevention effect can be achieved, the use quantity of the corrosion inhibitor is less, the corrosion prevention cost of an oil well is effectively reduced, and the method has great popularization significance. In addition, in the specific implementation, the formula can be used as an algorithm for controlling the corrosion inhibitor injection device, so that a foundation for realizing the automatic control of the corrosion inhibitor injection device is provided.
The correction coefficient β is based on CO 2 The correction value set by the complex corrosion factors of the flooding bottom water sandstone oil reservoir is obtained by experimental analysis of the corrosion factors, wherein the corrosion factors comprise temperature, salt content, material selection and flow rate of an oil well and the like. The corrected calculation formula, and the anti-corrosion measures implemented on the oil wells of the oil reservoirs are more reliable according to the calculation formula, so that the problem that the corrosion of the oil wells does not reach the standard due to the change of the corrosion environment is effectively avoided.
As some preferred embodiments of the present application, further optionally in step S6, the determining of the injection amount of the corrosion inhibitor for the next set period of time includes the steps of:
s61: determining the oil production quantity Q of an oil well in a current set time period 1 ；
S62: determining the liquid extraction quantity Q in the current set time period 1 The water content f;
s63: determining an adjacent next set time period injectionConcentration C of corrosion inhibitor in the well 1 ；
Determining the injection quantity Q of the corrosion inhibitor in the next set time period according to the following formula:
according to the application, the injection quantity of the corrosion inhibitor in the next adjacent set time period can be determined through the calculation formula; through verification, compared with the traditional injection quantity setting method, the injection quantity of the corrosion inhibitor determined by adopting the technical mode has the advantages of meeting the corrosion protection requirement, saving the corrosion inhibitor and the like. And provides a basis for controlling the corrosion inhibitor injection device, and avoids various problems (such as increased labor cost, untimely adjustment and the like) caused by manual on-site sampling and the like.
As some preferred embodiments of the present application, further optionally, in step S6, the corrosion inhibitor is injected into the oil well by continuous injection, and the injection speed v of the corrosion inhibitor in the next set time period is calculated by the following formula:
wherein: t is the duration of the next adjacent set time period;
q is the injection amount of the corrosion inhibitor in the next adjacent set time period;
v is the injection rate of the corrosion inhibitor for the next adjacent set time period.
According to the application, the corrosion inhibitor is injected in a continuous injection mode, and the injection speed of the corrosion inhibitor in a set time period can be calculated through the calculation formula; through verification, the injection amount of the corrosion inhibitor determined by the technical mode meets the corrosion protection requirement and has the advantages of saving the corrosion inhibitor.
As some preferred embodiments of the present application, further optionally in step S4, when selecting the corrosion inhibitor, the method comprises the steps of:
s41: selecting a plurality of corrosion inhibitors, and carrying out a water-solubility experiment aiming at each corrosion inhibitor to determine whether the corrosion inhibitors have emulsification tendency;
s42: selecting a corrosion inhibitor without emulsifying tendency, and testing the slow release rate of the corrosion inhibitor under a set condition;
s43: screening out corrosion inhibitors with the slow release rate larger than a set value to evaluate the corrosion rate under the simulated working condition; when the corrosion rate of the metal sample is smaller than 0.076mm/a, the slow release agent is qualified, and when the corrosion rate of the metal sample is larger than or equal to 0.076mm/a, the corrosion inhibitor is unqualified.
As some preferred embodiments of the present application, the current set time period is further selectively set to any one of 1 hour to 72 hours, and the next set time period is set to any one of 1 hour to 72 hours. The application can effectively adjust the implementation of the corrosion prevention process by setting the set time period to any value between 1 hour and 72 hours. The problems caused by the change of the corrosion environment due to overlong adjustment time are avoided, and the too short adjustment time can be avoided.
In a second aspect, the present application discloses a corrosion inhibitor injection device for CO according to any one of the preceding embodiments 2 The implementation of the oil well corrosion prevention method of the bottom water-flooding sandstone reservoir comprises the following steps:
the corrosion inhibitor storage unit is used for storing the corrosion inhibitor;
the corrosion inhibitor variable pumping unit and the corrosion inhibitor storage unit are communicated with the annular space between the oil extraction pipe and the shaft through the corrosion inhibitor variable pumping unit;
the system comprises an information acquisition module, a control module and a control module, wherein the information acquisition module comprises a carbon dioxide content detection unit, a water content detection unit and a corrosion rate detection unit, the carbon dioxide content detection unit is used for detecting the content of carbon dioxide in produced liquid, the water content detection unit is used for detecting the water content in the produced liquid, and the corrosion rate detection unit is used for detecting the corrosion rate of the produced liquid to an oil well;
The control unit is in signal connection with the carbon dioxide content detection unit, the water content detection unit and the corrosion rate detection unit; the corrosion inhibitor variable pumping unit is in signal connection with the control unit;
the information processing module is used for processing the information acquired by the information acquisition module; the information processing module is in signal connection with the control unit, and the information processing module is in signal connection with the information acquisition module.
The foregoing description is only an overview of the embodiments of the present application, and may be implemented in accordance with the content of the specification in order to make the technical means of the embodiments of the present application more clearly understood, and in order to make the above and other objects, features and advantages of the embodiments of the present application more comprehensible, the following specific embodiments of the present application are described in detail.
Drawings
FIG. 1 is a flow chart of the well preservation method of the present application;
FIG. 2 schematically shows a schematic structural view of a corrosion inhibitor injection apparatus;
fig. 3 is a schematic diagram of a monitoring unit of a corrosion inhibitor injection apparatus according to the present application.
The reference numerals are as follows:
1 a corrosion inhibitor variable pumping unit;
2, an information acquisition module;
3 a control unit;
4, an information processing module;
5, an early warning unit;
6, an information storage module;
7, an information remote transmission module;
81 liquid storage tanks, 82 heating components, 83 liquid level meters;
91 production tubing, 92 wellbore, 93 annulus.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, based on the embodiments of the application, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.
In a first aspect, the present application provides a CO 2 The oil well corrosion prevention method for the bottom water-flooding sandstone oil reservoir, as shown in fig. 1, comprises the following steps: s1: determination of CO 2 The method comprises the steps of (1) a metal material which is used for an oil well of a bottom water sandstone reservoir and needs to be preserved; s2: preparing a metal sample according to the metal material determined in S1, and simulating CO 2 Corrosiveness test is carried out under the working condition of the flooding bottom water sandstone oil reservoir, and the metal sample is determined to be in CO 2 Corrosion factors of oil wells driving the bottom water sandstone reservoir; s3: according to the corrosion factors determined in the step S2, determining the corrosion resistance of the metal materials used by the oil well under different corrosion conditions; s4: selecting a corrosion inhibitor according to the corrosion resistance of the metal material used by the oil well under different corrosion conditions, and loading the selected corrosion inhibitor into a corrosion inhibitor injection device; s5: determining the concentration required to be reached by the corrosion inhibitor in the produced liquid in the current set time period by combining the corrosion resistance of the metal material under different corrosion conditions and the corrosion conditions of the produced liquid in the current set time period; s6: and (3) determining and adjusting the injection quantity and the injection speed of the corrosion inhibitor injection device in the next set time period according to the concentration required to be achieved by the corrosion inhibitor in the produced liquid in the current set time period determined in the step (S5) so as to enable the corrosion rate of the oil well to be smaller than 0.076mm/a (millimeter/year).
It should be noted that, there is not necessarily a sequence among S1, S2, S3, S4, S5 and S6, which is merely a symbol representing each step; specifically, for example, S1 is "determine CO 2 Representative symbols of the step of driving a metal material to be preserved used in an oil well of a bottom water sandstone reservoir; likewise, S2, S3, S4, S5 and S6 are also merely representative symbols for each respective step. This writing is used for convenience of description only.
In the present application, the term "metallic material for corrosion protection for oil well" means a material used in CO 2 In the use process of an oil well of a bottom water-flooding sandstone oil reservoir, materials with corrosion conditions exist; metal materials used in, for example, well bores, tubing, sucker rods, etc.; the corrosion prevention technology is mainly used for preventing corrosion of the inner surface of a shaft, the inner surface and the outer surface of an oil pipe, the outer surface of a sucker rod and the like. It should be noted that metals requiring corrosion protectionThe material may be one kind or plural kinds, specifically, for example, one kind, two kinds, three kinds, four kinds, five kinds or six kinds or more, and it is to be noted that a certain numerical value or more includes the present number, for example, six kinds or more include six kinds.
In the present application, the term "analog CO" is used to denote 2 The working condition of the bottom water-flooding sandstone oil reservoir refers to the simulation of CO 2 In the actual use process of an oil well driving a bottom water sandstone reservoir, an anti-corrosion structure, component or assembly is required to be in an environment condition. The operating environment is not particularly limited and is determined based on the specific conditions of the well under investigation.
In the application, the "concentration required to be achieved by the corrosion inhibitor in the produced liquid in the current set time period" refers to the concentration required to be achieved by the corrosion inhibitor when the corrosion rate of the produced liquid to the oil well in the current set time period is less than 0.076 mm/a.
In the present application, the term "corrosion condition of the produced fluid in the current set time period" refers to a corrosion factor that causes corrosion of the produced fluid in the current set time period to the material to be protected used in the oil well, specifically, for example, the water content and CO in the produced fluid 2 Content, etc.
In specific implementation, step S3 may optionally include the following procedure: screening for CO 2 The corrosion factor of the corrosion caused by the bottom water sandstone oil reservoir is driven, and the corrosion factor is used as a test variable; determining a plurality of metal samples which are used for an oil well of a bottom water sandstone reservoir and need to be preserved; the parameters of the test variables are adjusted to form different test conditions, and the corrosion rate of the metal sample is subjected to grouping test; determining the corrosion rate of each metal sample under different set conditions according to the test result, and determining the corrosion resistance of the metal sample under different test conditions through comparison of the corrosion rates; determination of CO based on corrosion resistance of metal samples 2 Anti-corrosion measures of oil wells driving the bottom water sandstone reservoir.
By "corrosiveness factor" is meant a factor that can cause corrosion to the well, optionally including temperature, CO 2 Partial pressure, flow rate and water content of crude oil, but are not limited to, temperature, CO 2 Partial pressure, flow rate, and crude water content. It may also include other factors that can cause corrosion to the well, such as the type of salt, the proportion of salt, etc.
It should be noted that, the structure of the metal sample is not particularly limited, and in the specific implementation, the metal sample is preferably a sheet structure with the same surface area, and when the metal sample is a sheet structure, it may also be called a metal test piece; in order to avoid confusion, the metal sample tested is preferably marked when it is to be embodied.
The term "adjusting parameters of test variables" means adjusting parameters including temperature and CO 2 Parameters such as partial pressure, flow rate, and water content of crude oil. In addition, the term "corrosion resistance" refers to the ability of a metal sample to resist corrosion.
In particular embodiments, the corrosion reaction test may optionally be performed in a reaction vessel.
The application screens the corrosion factors causing corrosion to the bottom water sandstone oil reservoir and screens the CO 2 The corrosion resistance of the metal samples with different materials under different test conditions can be determined by testing the corrosion rates of the metal materials used for the oil well of the flooding bottom water sandstone reservoir in different environments, and the CO is further determined based on the test result 2 The corrosion prevention process of the flooding water sandstone oil reservoir can effectively prevent corrosion of the oil well and can achieve a better corrosion prevention effect. In addition, according to the test result, the method can also guide CO 2 The materials and arrangement of the oil well of the driving bottom water sandstone reservoir can be used for arranging wellbores, oil pipes and the like with different materials according to corrosion conditions at different positions in the well depth direction, so that the built oil well has better corrosion resistance, and the corrosion prevention cost of the oil well can be effectively reduced; in addition, in the construction process of the oil well, materials such as a shaft, an oil pipe and the like can be selected according to different corrosion environments of the oil well at different positions, so that the construction cost of the oil well can be reduced.
In the specific implementation, the corrosion rate of the metal sample is further selectively determined according to the mass difference before and after the reaction of the metal sample, and the calculation formula of the corrosion rate is as follows:
Wherein: v (V) corr Is the corrosion rate in mm/a;
Δm is the weight loss of the metal sample, Δm=m 0 -m 1 ，m 0 For the weight of the metal specimen before corrosion testing, m 1 The weight of the metal sample after corrosion test is g;
ρ is the density of the metal sample in g/cm 3 ；
t is the reaction time, and the unit is h;
s is the surface area of the metal sample in cm 2 。
According to the application, through the calculation formula of the corrosion rate, the corrosion rate of the metal sample can be more accurately calculated through the mass of the metal sample before the test and the mass of the metal sample after the test.
The application is realized by determining CO 2 Metallic material to be preserved for oil well of bottom water-flooding sandstone reservoir, and corresponding metallic material is used as sample to simulate CO 2 Corrosiveness test is carried out on working condition environment of the bottom water-flooding sandstone oil reservoir, and CO is further determined 2 And (3) driving corrosion factors of oil wells of the bottom water sandstone reservoir, and carrying out CO based on the corrosion factors 2 The corrosion proof basis of the oil well for driving the bottom water sandstone reservoir can further solve the problem of CO 2 The corrosion prevention problem of the oil well of the oil reservoir of the driving bottom water sandstone can be solved more scientifically and pertinently by the formulated corrosion prevention method, and technical support can be provided for the exploitation of a large number of stopped and abandoned oil reservoirs.
In addition, the application is realized by the method for preparing the CO 2 Corrosion research of oil wells of a flooding sandstone reservoir is combined with analysis of corrosion conditions of produced fluid, so as to determine the required slowness of the oil wells of the reservoirThe concentration of the corrosion inhibitor is further determined according to the mode of adding the corrosion inhibitor, and the injection quantity and the injection speed of the corrosion inhibitor in the next set time period are determined, so that the corrosion inhibitor injection device is controlled, and the problem of high exploitation cost caused by blindly adding the corrosion inhibitor in the corrosion prevention method is solved.
As some preferred embodiments of the application, the corrosion factors determined in the step S2 further comprise temperature and CO 2 Partial pressure, flow rate and crude water content; the metal sample is at least one of a sample made of P110S steel, a sample made of P110-13Cr steel, a sample made of P110 steel, and a sample made of N80 steel.
The application selects temperature and CO based on early experiments and a large amount of research work 2 Partial pressure, flow rate and crude oil moisture content as CO 2 The main test variables of the oil well of the flooding bottom water sandstone oil reservoir are regulated to form different test conditions, so that the corrosion environment of the oil well of the bottom water sandstone oil reservoir can be better reduced, and the test result based on the corrosion environment can more objectively reflect CO 2 The corrosion environment of the flooding bottom water sandstone oil reservoir is tested to obtain a result of CO 2 The formulation of the corrosion prevention process of the bottom water-flooding sandstone reservoir provides more objective and effective guidance. Specifically, according to analysis of the corrosion factors, the formulation of the corrosion prevention process of the oil well of the oil reservoir is guided, so that the corrosion prevention can reach the corrosion prevention requirement, the waste of the corrosion inhibitor can be avoided, and the exploitation cost of the oil reservoir is further reduced.
It should be noted that, in the bottom water sandstone reservoir, metal products made of P110-13Cr steel, P110S steel, P110 steel and N80 steel (specifically, for example, the well bore is made of P110-13Cr steel, P110S steel, P110 steel and N80 steel) are often used, and because of the materials, the metal products have large differences in price, so it is clear that the study of CO 2 The corrosion cause of the bottom-water-flooding sandstone oil reservoir has important significance for the development and corrosion prevention of the oil reservoir.
The application makes the metal sample include the sample made of P110S steel and the sample made of P110-13Cr steelThe samples of P110 steel and N80 steel can be used as the main study object by using the materials commonly selected for oil wells, and can be based on CO 2 The specific corrosion environment of the bottom water-flooding sandstone oil reservoir is researched, the corrosion rate of each material under different environments and conditions is researched, and according to the corrosion resistance of each metal material under different corrosion environments, the corrosion rate of each metal material is improved to CO 2 The corrosion prevention technology and the corrosion prevention strategy of the bottom water-flooding sandstone reservoir provide more scientific basis. In addition, the corrosion conditions of the samples of the P110S steel, the samples of the P110-13Cr steel, the samples of the P110 steel and the samples of the N80 steel are different in the depth direction of the oil well under different corrosion conditions, the corrosion resistance of the samples is also different, and the samples are not regular and can be circulated, and the obtained test results provide scientific references and bases for the materials of the oil well by taking the materials as test objects, for example, the corrosion resistance of different materials under different corrosion conditions is different, and further, shafts, oil pipes and the like with different materials can be selected according to different depths (different depths and different corrosion conditions) of the same oil well.
As some preferred embodiments of the present application, further optionally in step S2, the temperature is selected in the range of 35 ℃ to 120 ℃; and/or, causing the CO to 2 The partial pressure is selected within the range of 0.5MPa-2.0MPa; and/or, the flow rate is selected to be in the range of 0.5m/s-2.0m/s; and/or, the water content of the crude oil is selected to be 20% -95%.
The application is realized by mixing the temperature and CO 2 The partial pressure, the flow rate and the water content of crude oil are selected to be the numerical ranges, and the CO at different geographic positions can be covered 2 The corrosion environment of the bottom water-flooding sandstone oil reservoir is driven, so that the corrosion environment is researched more fully, and a more comprehensive guidance is provided for the corrosion prevention method of the oil reservoir. Specifically, by mixing the temperature, CO 2 The selected ranges of partial pressure, flow rate and crude oil water content are selected according to the ranges, the selected numerical ranges can cover corrosion environments of different well depths of the bottom water sandstone reservoir, based on the corrosion environments, the different positions of the bottom water sandstone reservoir can be tested, and the material is combined according to the research resultThe materials such as the material cost, the corrosion resistance difficulty, the corrosion resistance cost and the like are selected, the shafts are arranged in the well depth direction according to the corrosion rates of different positions, and the shafts with different materials are specifically selected according to the different positions of the well depth, so that the effects of reducing the cost and the corrosion resistance cost in the oil extraction process are achieved. In particular embodiments, the temperature can be further optionally selected from the group consisting of 35 ℃, 60 ℃, 90 ℃ and 120 ℃; and/or CO 2 The test selection values of the partial pressure comprise 0.5MPa, 1MPa, 1.5MPa and 2MPa; and/or, the test selection values of the flow rate are made to include 0.5m/s, 1m/s, 1.5m/s and 2m/s; and/or, the test selections for the water content of the crude oil include 20%, 50%, 80%, and 95%.
As some preferred embodiments of the present application, step S3 further comprises optionally:
s31: uniformly mixing crude oil and water according to a set proportion to form an oil-water mixed solution, and filling the oil-water mixed solution and a metal sample into a reaction container;
s32: adjusting the temperature in the reaction vessel to a set temperature and adjusting the pressure in the reaction vessel to a set pressure;
s33: adjusting the flow rate of the oil-water mixed solution in the reaction container according to the set flow rate;
s34: reacting the weighed metal sample for a set period of time at a set temperature, a set pressure and a set flow rate;
s35: taking out the reacted metal sample, and cleaning, drying and weighing the metal sample;
s36: and determining the corrosion rate of the metal sample according to the difference of the quality of the metal sample before and after the reaction.
The "set ratio" in S31 is a ratio set according to the test requirement. Specifically, for example, 20% of crude oil, 80% of water, 30% of crude oil, 70% of water, or the like, is selectively set according to the setting of the test conditions in the specific implementation. In practice, the test water is preferably taken from the bottom water sandstone reservoir formation under investigation and the crude oil is taken from the bottom water sandstone reservoir formation under investigation; thus, the corrosion condition of the researched bottom water sandstone reservoir can be more accurately and objectively simulated. Also, in S34, the set temperature, the set pressure, the set flow rate, and the set duration are selectively set according to the setting of the test conditions. In practice, crude oil is preferably collected from a desired corrosion-resistant reservoir, and more preferably water is also collected from a desired corrosion-resistant reservoir.
In step S32, the temperature may be adjusted first, and then the pressure may be adjusted; or, the pressure is adjusted first and then the temperature is adjusted.
According to the application, crude oil and water are mixed according to the set proportion, so that the produced liquid of the bottom water sandstone reservoir is modulated, and the conditions of the tested temperature, pressure and flow rate are further regulated according to the actual corrosion environment of the shaft, so that the corrosion conditions of different corrosion environments can be reflected more accurately, and the research conclusion has more reference significance.
In a preferred embodiment of the present application, in S34, the reaction time period for the metal sample in the reaction vessel is further optionally 72 hours or longer. In specific implementation, the reaction time period can be set to 72 hours, 96 hours, 120 hours, 144 hours, 168 hours, 192 hours, 216 hours or 240 hours selectively; and the like, and is not particularly limited herein, and in practice, the set reaction time period of the metal sample in the reaction vessel is not limited to the above-listed time period, and may be any reaction time period of more than 72 hours.
As some preferred embodiments of the present application, further selectively between S31 and S32, further comprising: CO is processed by 2 And feeding the oil-water mixed solution to remove oxygen in the oil-water mixed solution.
The application adjusts the temperature and the pressure in the reaction vessel before the CO 2 Is fed into the oil-water mixed solution, so that CO can be more truly simulated 2 The corrosion environment of the bottom water-flooding sandstone oil reservoir is avoided, the influence of oxygen on the test result is avoided, and the research result is more objective and more reference. In addition, the oil-water mixture can be fed intoCO 2 The test results of (2) are compared, and then the CO can be reflected 2 The corrosion degree of different materials of the oil well under different corrosion conditions is CO 2 The anti-corrosion work of the oil displacement oil well provides an important reference.
In the concrete implementation, the oil-water mixed solution is filled into a reaction kettle, and sufficient CO is fed into the oil-water mixed solution 2 And (3) gas to remove oxygen in the oil-water mixed solution.
As some preferred embodiments of the present application, further selectively between S31 and S32, further comprising: CO is processed by 2 And feeding the oil-water mixed solution to remove oxygen in the oil-water mixed solution.
The application adjusts the temperature and the pressure in the reaction vessel before the CO 2 Is fed into the oil-water mixed solution, so that CO can be more truly simulated 2 The corrosion environment of the bottom water sandstone reservoir is driven, so that the influence of oxygen on the test result is avoided, and the research result is more objective. In addition, CO can be added into the oil-water mixture 2 The test results of (2) are compared, and then the CO can be reflected 2 The corrosion degree of the metal material of the oil well under different corrosion conditions is CO 2 The anti-corrosion work of the oil displacement oil well provides an important reference.
As some preferred embodiments of the present application, further optionally in the step S5, the concentration of the corrosion inhibitor required to be achieved in the produced liquid for the current set period of time is calculated according to the following formula:
wherein: c is the concentration (Kg/m) of corrosion inhibitor in the produced liquid 3 )；
Beta is a correction coefficient;
v is the corrosion rate (mm/a) of the produced fluid to the oil well in the detected current set time period;
a is the percentage (%) of carbon dioxide in the produced liquid in the current set time period;
η is the water content (%) in the produced liquid in the current set period;
C 0 corrosion inhibitor concentration (Kg/m) required for oil well to reach 0.076mm/a in corrosion rate 3 )。
It should be noted that, the corrosion rate of the produced liquid to the oil well can be detected by the corrosion rate detection device and related detection information can be obtained; similarly, the percentage of carbon dioxide in the produced liquid and the water content in the produced liquid can be detected and obtained by corresponding detection units respectively.
The method can estimate the concentration required to be reached by the corrosion inhibitor in the produced liquid in the set time period through the formula, and further can estimate the injection quantity and the injection speed of the corrosion inhibitor in the next set time period according to the value. Based on the formula, the corrosion inhibitor injection device can correct the injection amount and the injection speed of the corrosion inhibitor according to the actual analysis condition of the produced liquid. Through verification, the injection quantity and the injection speed are estimated by adopting the calculation formula, and compared with the traditional corrosion inhibitor injection method, the corrosion inhibitor has the advantages that the better corrosion prevention effect can be achieved, the use quantity of the corrosion inhibitor is less, the corrosion prevention cost of an oil well is effectively reduced, and the method has great popularization significance. In addition, in the specific implementation, the formula can be used as an algorithm for controlling the corrosion inhibitor injection device, so that a foundation for realizing the automatic control of the corrosion inhibitor injection device is provided.
The correction coefficient β is based on CO 2 The correction value set by the complex corrosion factors of the flooding bottom water sandstone reservoir can be obtained through experimental analysis of the corrosion factors, wherein the corrosion factors comprise temperature, salt content, material selection of an oil well, flow rate of produced liquid and the like. The corrected calculation formula, and the anti-corrosion measures implemented on the oil wells of the oil reservoirs are more reliable according to the calculation formula, so that the problem that the oil wells are not corroded to reach standards due to the deterioration of the corrosion environment is effectively avoided. It should be noted that the correction coefficient β is not less than 0.
As some preferred embodiments of the present application, further optionally in the step S6, the determining of the injection amount of the corrosion inhibitor for the next set period of time includes the steps of:
s61: determining the oil production quantity Q of an oil well in a current set time period 1 (T or m) 3 )；
S62: determining the liquid extraction quantity Q in the current set time period 1 The water content f (%);
s63: determining the concentration C of corrosion inhibitor injected into the oil well in the next set period 1 (Kg/m 3 )
Determining the injection quantity Q (T or m) of the corrosion inhibitor in the next set time period according to the following formula 3 )：
Wherein C is the concentration (Kg/m) of the corrosion inhibitor in the produced liquid 3 ). According to the application, the injection quantity of the corrosion inhibitor in the next adjacent set time period can be determined through the calculation formula; through verification, compared with the traditional injection quantity setting method, the injection quantity of the corrosion inhibitor determined by adopting the technical mode has the advantages of meeting the corrosion protection requirement, saving the corrosion inhibitor and the like. And provide basis for the control of corrosion inhibitor injection device, avoid a great deal of problems that manual on-the-spot sampling etc..
As some preferred embodiments of the present application, in step S6, the corrosion inhibitor is further optionally injected into the oil well by continuous injection, and the injection speed v of the corrosion inhibitor in the next set time period is calculated by the following formula:
wherein: t is the next adjacent set time period.
According to the application, the corrosion inhibitor is injected in a continuous injection mode, and the injection speed of the corrosion inhibitor in a set time period can be calculated through the calculation formula; through verification, the injection amount of the corrosion inhibitor determined by the technical mode meets the corrosion protection requirement and has the advantages of saving the corrosion inhibitor.
As some preferred embodiments of the present application, further optionally in step S4, when selecting the corrosion inhibitor, the method comprises the steps of:
s41: selecting a plurality of corrosion inhibitors, and carrying out a water-solubility experiment aiming at each corrosion inhibitor to determine whether the corrosion inhibitors have emulsification tendency;
s42: selecting a corrosion inhibitor without emulsifying tendency, and testing the slow release rate of the corrosion inhibitor under a set condition;
s43: screening out corrosion inhibitors with the slow release rate larger than a set value to evaluate the corrosion rate under the simulated working condition; when the corrosion rate of the metal sample is smaller than 0.076mm/a, the slow release agent is qualified, and when the corrosion rate of the metal sample is larger than or equal to 0.076mm/a, the corrosion inhibitor is unqualified.
As some preferred embodiments of the present application, the current set time period is further selectively set to any one of 1 hour to 72 hours, and the next set time period is set to any one of 1 hour to 72 hours. The application can adjust the implementation of the corrosion prevention technology in time by setting the set time period to any value between 1 hour and 72 hours. The problems caused by the change of the corrosive environment due to overlong adjustment time are avoided.
It should be noted that, the duration set by the "current setting time period" and the duration set by the "next setting time period" in the present application are not particularly limited, and may be selectively set according to actual production requirements, for example, the "current setting time period" and the "next setting time period" are selectively set to any time period between 1 hour and 72 hours. Specifically, for example, the set time period is set to any one of 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 8 hours, 10 hours, 12 hours, 14 hours, 16 hours, 18 hours, 20 hours, 22 hours, 24 hours, 26 hours, 28 hours, 30 hours, 32 hours, 34 hours, 36 hours, 38 hours, 40 hours, 42 hours, 44 hours, 46 hours, 48 hours, 50 hours, 52 hours, 54 hours, 56 hours, 58 hours, 60 hours, 62 hours, 64 hours, 66 hours, 68 hours, 70 hours, 72 hours; of course, in the implementation, the set period of time is not limited to the above-listed data, and may be any value between 1 hour and 72 hours, for example, 7 hours, 7.5 hours, and the like. In the specific setting, the selective setting is performed according to the actual condition of the oil production well, and the setting is performed according to the information given by the produced liquid. In the implementation, the time periods of the current setting time period and the adjacent next setting time period can be selectively made to be the same, and the time periods of the current setting time period and the adjacent next setting time period can also be made to be different.
In a second aspect, the present application discloses a corrosion inhibitor injection device for CO according to any one of the embodiments 2 As shown in fig. 2, the corrosion inhibitor injection device comprises a corrosion inhibitor storage unit, a corrosion inhibitor variable pumping unit, an information acquisition module, a control unit and an information processing module, wherein the corrosion inhibitor storage unit is used for storing a corrosion inhibitor; the corrosion inhibitor storage unit is communicated with an annular space 93 between the oil production pipe 91 and the shaft 92 through the corrosion inhibitor variable pumping unit 1; the information acquisition module 2 comprises a carbon dioxide content detection unit, a water content detection unit and a corrosion rate detection unit, wherein the carbon dioxide content detection unit is used for detecting the content of carbon dioxide in the produced liquid, the water content detection unit is used for detecting the water content in the produced liquid, and the corrosion rate detection unit is used for detecting the corrosion rate of the produced liquid to an oil well; the control unit 3 is in signal connection with the carbon dioxide content detection unit, the water content detection unit and the corrosion rate detection unit; the corrosion inhibitor variable pumping unit 1 is in signal connection with the control unit 3; the information processing module 4 is used for processing the information acquired by the information acquisition module; the information processing module 4 is in signal connection with the control unit 3, and the information processing module 4 is in signal connection with the information acquisition module 2.
It should be noted that the structure of the corrosion inhibitor storage unit in the present application is not particularly limited, and may be any structure capable of storing the corrosion inhibitor, for example, the corrosion inhibitor storage unit is specifically configured as a tank or a case. Also, the kind of the corrosion inhibitor variable pumping unit 1 is not particularly limited, and it may be any variable pump capable of pumping the corrosion inhibitor and adjusting the pumping flow rate; in specific implementation, the pump can be selectively provided as a gear pump, a vane pump, a plunger pump and the like.
It should be noted that, the information acquisition module 2 in the present application includes, but is not limited to, a carbon dioxide content detection unit, a water content detection unit, and a corrosion rate detection unit; it may also comprise other detection units for information acquisition. For example, in implementation, the information acquisition module 2 may also optionally include a produced fluid metering unit (or produced fluid flow rate detection unit), a temperature detection unit, and so forth.
In the concrete implementation, the information processing module 4 is enabled to calculate the concentration required to be reached by the corrosion inhibitor in the produced liquid according to the carbon dioxide concentration information, the water content information and the corrosion rate information in the produced liquid acquired by the information acquisition module 2; and calculating the injection quantity and the injection speed required by the corrosion inhibitor in the next adjacent set time period according to the liquid production quantity of the oil well in the set time period, the water content of the oil well produced liquid in the set time period, the concentration required to be reached by the corrosion inhibitor in the produced liquid and the concentration of the corrosion inhibitor injected into the oil well.
According to the application, the corrosion inhibitor injection device comprises the control unit 3, and the control unit 3 controls the corrosion inhibitor injection device according to the information acquired by the information acquisition module 2, so that the corrosion inhibitor injection device can automatically adjust the flow of the corrosion inhibitor variable pumping unit 1 according to the processing result after processing the acquired information, and the aim of automatically adjusting the injection quantity and the injection speed of the corrosion inhibitor is fulfilled.
According to the corrosion inhibitor injection device, the information processing module 4 is arranged, the information processing module 4 is used for processing according to the collected carbon dioxide concentration information, the water content information and the corrosion rate information, the injection amount required by the corrosion inhibitor in a set time period is further calculated, and the injection amount information is sent to the control unit 3 so as to control the corrosion inhibitor injection device, so that the automatic control of the corrosion inhibitor injection device is realized. Preferably, the corrosion inhibitor injection device further comprises a remote information transmission unit, so that the remote information transmission is realized, the corrosion inhibitor injection device has a remote control function, and the workload of manual field inspection is reduced.
As some preferred embodiments of the present application, the corrosion inhibitor storage unit further optionally includes a liquid storage tank 81, and a heating assembly 82, wherein the liquid storage tank 81 is used for storing the corrosion inhibitor (as shown in fig. 3), the heating assembly 82 is used for heating the corrosion inhibitor in the liquid storage tank 81, and the heating assembly 82 is in signal connection with the control unit 3; the information acquisition module 2 further comprises a temperature detection unit, the temperature detection unit is used for detecting the temperature of the corrosion inhibitor in the liquid storage tank 81, and the temperature detection unit is in signal connection with the control unit 3.
It should be noted that, the structure and shape of the liquid storage tank 81 in the present application are not particularly limited, and may be a tank capable of storing a certain amount of corrosion inhibitor; the capacity of the reservoir 81 is selectively set, particularly according to the requirements of the well to be protected, to avoid frequent on-site corrosion inhibitor filling by personnel.
It should be noted that, the heating element 82 in the present application is not limited in particular, and may be a heating rod (as shown in fig. 3) disposed inside the liquid storage tank 81 and capable of heating the corrosion inhibitor, or may be a heating element (not shown) wrapped on an outer side wall of the liquid storage tank 81 and capable of heating the corrosion inhibitor, such as an electric blanket. In specific implementation, the heating assembly is preferably heated by adopting an electric heating mode; to avoid fire, the maximum heating temperature of the heating assembly is limited to a safe-to-use temperature range.
It should be noted that the temperature detecting unit in the present application is used to detect the temperature of the corrosion inhibitor in the liquid storage tank 81, and the temperature detecting unit is in signal connection with the control unit 3. In a specific implementation, when the temperature of the corrosion inhibitor in the liquid storage tank 81 detected by the temperature detection unit is lower than a set value, the control unit 3 receives the temperature information detected by the temperature detection unit and controls the heating component 82 to heat the corrosion inhibitor, so as to avoid the problem that the corrosion inhibitor is frozen due to lower ambient temperature. Therefore, the application avoids the problems caused by freezing of the corrosion inhibitor due to too low temperature and the problems caused by the freezing by arranging the temperature detection unit and the heating component.
As some preferred embodiments of the present application, as shown in fig. 3, the corrosion inhibitor injection device further optionally further includes an early warning unit 5, where the early warning unit 5 is in signal connection with the carbon dioxide content detection unit, and the early warning unit 5 is in signal connection with the control unit 3. Preferably, the corrosion inhibitor storage unit can further optionally further comprise a liquid level meter 83, and the liquid level meter 83 is in signal connection with the early warning unit 5.
According to the application, the corrosion inhibitor injection device comprises the early warning unit 5, the early warning unit 5 is in signal connection with the carbon dioxide content detection unit, and when the concentration of carbon dioxide collected by the carbon dioxide content detection unit is greater than a set value, the early warning unit 5 sends out early warning information. The liquid level meter 83 is arranged, so that the corrosion inhibitor in the corrosion inhibitor storage unit can be monitored, the liquid level meter 83 is further connected with the early warning unit 5 in a signal mode, the liquid level of the corrosion inhibitor can be monitored, prompt information is sent to staff, and the staff can timely supplement the corrosion inhibitor.
As some preferred embodiments of the present application, the corrosion inhibitor injection apparatus further optionally further includes an information storage module 6, where the information storage module 6 is in signal connection with the information acquisition module 2 to store information acquired by the information acquisition module 2.
The application sets the information storage module 6, and makes the information collected by the information collection module 2 pass through the information storage module 6 to be stored, and uses the stored information as an important reference of oil displacement technology and corrosion prevention technology.
As some preferred embodiments of the present application, the corrosion inhibitor injection apparatus further optionally further comprises an information remote transmission module 7, the information remote transmission module 7 is in signal connection with the information acquisition module 2, and the information remote transmission module 7 is in signal connection with the control unit 3. According to the application, the information remote transmission function can be realized by arranging the information remote transmission module 7, so that the information remote transmission module is in signal connection with the control unit 3, the corrosion inhibitor injection device can realize remote control, and the inspection times of workers are reduced.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. CO (carbon monoxide) 2 The oil well corrosion prevention method for the bottom water-flooding sandstone oil reservoir is characterized by comprising the following steps of:
s1: determination of CO 2 The method comprises the steps of (1) a metal material which is used for an oil well of a bottom water sandstone reservoir and needs to be preserved;
s2: preparing a metal sample according to the metal material determined in S1, and simulating CO 2 Corrosiveness test is carried out under the working condition of the flooding bottom water sandstone oil reservoir, and the metal sample is determined to be in CO 2 Corrosion factors of oil wells driving the bottom water sandstone reservoir;
s3: according to the corrosion factors determined in the step S2, determining the corrosion resistance of the metal materials used by the oil well under different corrosion conditions;
s4: selecting a corrosion inhibitor according to the corrosion resistance of the metal material used by the oil well under different corrosion conditions, and loading the selected corrosion inhibitor into a corrosion inhibitor injection device;
s5: determining the concentration required to be reached by the corrosion inhibitor in the produced liquid in the current set time period by combining the corrosion resistance of the metal material under different corrosion conditions and the corrosion conditions of the produced liquid in the current set time period;
s6: and (3) determining and adjusting the injection quantity and the injection speed of the corrosion inhibitor injection device in the next set time period according to the concentration required to be achieved by the corrosion inhibitor in the produced liquid in the current set time period determined in the step (S5), so that the corrosion rate of the oil well is smaller than 0.076mm/a.
2. The CO according to claim 1 2 An oil well anticorrosion method for a bottom water-flooding sandstone oil reservoir is characterized in that,
the corrosion factors determined in the step S2 comprise temperature and CO 2 Partial pressure, flow rate and crude water content;
the metal sample is at least one of a sample made of P110S steel, a sample made of P110-13Cr steel, a sample made of P110 steel, and a sample made of N80 steel.
3. The CO according to claim 2 2 The oil well corrosion prevention method of the bottom water-flooding sandstone reservoir is characterized in that in the step S2:
the temperature is selected within the range of 35-120 ℃; and/or the number of the groups of groups,
the CO 2 The partial pressure is selected within the range of 0.5MPa-2.0MPa; and/or the number of the groups of groups,
the flow rate is selected within the range of 0.5m/s-2.0m/s; and/or the number of the groups of groups,
the water content of the crude oil is selected to be 20% -95%.
4. The CO according to claim 1 2 The oil well corrosion prevention method of the bottom water-flooding sandstone reservoir is characterized in that the step S3 comprises the following steps:
s31: uniformly mixing crude oil and water according to a set proportion to form an oil-water mixed solution, and filling the oil-water mixed solution and a metal sample into a reaction container;
s32: adjusting the temperature in the reaction vessel to a set temperature and adjusting the pressure in the reaction vessel to a set pressure;
S33: adjusting the flow rate of the oil-water mixed solution in the reaction container according to the set flow rate;
s34: reacting the weighed metal sample for a set period of time at a set temperature, a set pressure and a set flow rate;
s35: taking out the reacted metal sample, and cleaning, drying and weighing the metal sample;
s36: and determining the corrosion rate of the metal sample according to the difference of the quality of the metal sample before and after the reaction.
5. A CO according to any one of claims 1 to 4 2 Bottom-driving water sandAn oil well corrosion prevention method for a rock oil reservoir is characterized in that,
in the step S5, the concentration required to be reached by the corrosion inhibitor in the produced liquid in the current set time period is calculated according to the following formula:
wherein: c is the concentration of the corrosion inhibitor in the produced liquid;
beta is a correction coefficient;
v is the corrosion rate of the produced liquid to the oil well in the detected current set time period;
a is the percentage of carbon dioxide in the produced liquid in the current set time period;
η is the water content in the produced liquid in the current set time period;
C 0 the corrosion inhibitor concentration required for the oil well to reach 0.076mm/a at the corrosion rate.
6. The CO of claim 5 2 The oil well corrosion prevention method of the bottom water-flooding sandstone oil reservoir is characterized in that in the step S6, the determination of the injection amount of the corrosion inhibitor in the next set time period comprises the following steps:
S61: determining the oil production quantity Q of an oil well in a current set time period 1 ；
S62: determining the liquid extraction quantity Q in the current set time period 1 The water content f;
s63: determining the concentration C of corrosion inhibitor injected into the oil well in the next set period 1 ；
Determining the injection quantity Q of the corrosion inhibitor in the next set time period according to the following formula:
7. the CO of claim 6 2 Driving bottomThe oil well corrosion prevention method of the water sandstone oil reservoir is characterized in that in the step S6, corrosion inhibitors are injected into the oil well in a continuous injection mode, and the calculation formula of the injection speed v of the corrosion inhibitors in the next adjacent set time period is as follows:
wherein: and t is the duration of the next adjacent set time period.
8. The CO according to claim 1 2 The oil well corrosion prevention method of the bottom water-flooding sandstone oil reservoir is characterized by comprising the following steps when a corrosion inhibitor is selected in the step S4:
s41: selecting a plurality of corrosion inhibitors, and carrying out a water-solubility experiment aiming at each corrosion inhibitor to determine whether the corrosion inhibitors have emulsification tendency;
s42, selecting a corrosion inhibitor without emulsifying tendency, and testing the slow release rate of the corrosion inhibitor under the set condition;
s43: screening out corrosion inhibitors with the slow release rate larger than a set value to evaluate the corrosion rate under the simulated working condition; when the corrosion rate of the metal sample is smaller than 0.076mm/a, the slow release agent is qualified, and when the corrosion rate of the metal sample is larger than or equal to 0.076mm/a, the corrosion inhibitor is unqualified.
9. The CO according to claim 1 2 An oil well anticorrosion method for a bottom water-flooding sandstone oil reservoir is characterized in that,
the current set time period is set to any one of 1 hour to 72 hours, and the next set time period is set to any one of 1 hour to 72 hours.
10. A corrosion inhibitor injection device for CO according to any one of claims 1 to 9 2 The implementation of the oil well corrosion prevention method of the bottom water-flooding sandstone reservoir is characterized in that the corrosion inhibitor injection device comprises:
the corrosion inhibitor storage unit is used for storing the corrosion inhibitor;
the corrosion inhibitor variable pumping unit is communicated with the annular space between the oil production pipe and the shaft through the corrosion inhibitor variable pumping unit;
the system comprises an information acquisition module, a control module and a control module, wherein the information acquisition module comprises a carbon dioxide content detection unit, a water content detection unit and a corrosion rate detection unit, the carbon dioxide content detection unit is used for detecting the content of carbon dioxide in produced liquid, the water content detection unit is used for detecting the water content in the produced liquid, and the corrosion rate detection unit is used for detecting the corrosion rate of the produced liquid to an oil well;
the control unit is in signal connection with the carbon dioxide content detection unit, the water content detection unit and the corrosion rate detection unit; the corrosion inhibitor variable pumping unit is in signal connection with the control unit;
The information processing module is used for processing the information acquired by the information acquisition module; the information processing module is in signal connection with the control unit, and the information processing module is in signal connection with the information acquisition module.
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