CN108678727B - Annular space protection liquid supplementing method and device - Google Patents
Annular space protection liquid supplementing method and device Download PDFInfo
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- CN108678727B CN108678727B CN201810430897.XA CN201810430897A CN108678727B CN 108678727 B CN108678727 B CN 108678727B CN 201810430897 A CN201810430897 A CN 201810430897A CN 108678727 B CN108678727 B CN 108678727B
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- 239000007788 liquid Substances 0.000 title claims abstract description 155
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000001502 supplementing effect Effects 0.000 title claims abstract description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 122
- 239000012530 fluid Substances 0.000 claims abstract description 88
- 239000007789 gas Substances 0.000 claims abstract description 77
- 239000003345 natural gas Substances 0.000 claims abstract description 61
- 238000004519 manufacturing process Methods 0.000 claims abstract description 30
- 238000002637 fluid replacement therapy Methods 0.000 claims abstract description 18
- 238000001802 infusion Methods 0.000 claims abstract description 18
- 238000003860 storage Methods 0.000 claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 57
- 229910052757 nitrogen Inorganic materials 0.000 claims description 29
- 230000001681 protective effect Effects 0.000 claims description 14
- 238000005260 corrosion Methods 0.000 claims description 7
- 230000007797 corrosion Effects 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 abstract description 11
- 238000004364 calculation method Methods 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 description 7
- 239000001569 carbon dioxide Substances 0.000 description 7
- 238000004590 computer program Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- E21B47/00—Survey of boreholes or wells
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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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a method and a device for supplementing an annular protection solution, wherein the method comprises the following steps: acquiring basic data of an annulus fluid infusion well; acquiring the liquid level height of the annular protection liquid; determining the volume of the natural gas in the air of the oil collar according to the basic data of the annular fluid infusion well and the liquid level height of the annular protection fluid; determining the volume and concentration of the annular protection liquid to be filled according to the volume of the natural gas in the air of the oil jacket ring; and (4) performing fluid replacement operation according to the volume and concentration of the annular protection fluid required to be filled. According to the scheme, through the steps of liquid level height measurement, annular natural gas volume calculation, filling protection liquid volume and concentration calculation and the like, the performance of protection liquid in the whole annulus after filling is consistent with design indexes, the protection effect of the annular protection liquid on an oil casing is improved, the safety of a gas well and a pipe column of an injection and production well is ensured, and the safe operation of the gas field and a gas storage reservoir is ensured.
Description
Technical Field
The invention relates to the technical field of gas production engineering, in particular to a method and a device for supplementing an annular protection liquid.
Background
With the rapid development of natural gas, more and more complex gas fields are put into development. In the gas well and the gas storage reservoir injection and production well that contain corrosive media such as carbon dioxide, install packer in the pit mostly, seal and separate oil jacket annular space, avoid the sleeve pipe to bear the high pressure to at oil jacket annular space filling annular space protection fluid, avoid the sleeve pipe to suffer the corruption. In-situ practice has found that leakage from the pipe string or downhole tool threads or body can result in a reduction in the level of the annular protection fluid, or even a total loss of annular protection fluid. If the liquid level of the annular protection liquid is far lower than the designed height, natural gas is inevitably filled above the liquid level, corrosive media such as carbon dioxide in the natural gas can directly contact the inner wall of the sleeve and the outer wall of the oil pipe above the liquid level, the annular protection liquid cannot be protected, and the risk of corrosion failure exists. In addition, if the liquid level is too low, the annular protection liquid cannot effectively balance the pressure difference between the upper part and the lower part of the packer and the pressure inside and outside the oil pipe, and the safety of the packer and the oil pipe is threatened. For wells with balanced annular leakage, the annular liquid level is basically stable, and annular fluid replacement can improve the potential safety hazard caused by the fact that the annular liquid level is lower than the design height. The existing filling mode is to directly fill the original formula annular space protection liquid. However, since natural gas enters the oil sleeve in the air, corrosive media such as carbon dioxide in the oil sleeve inevitably react with components in the annular protection liquid, so that the performance of the annular protection liquid is reduced or loses efficacy, and if the original annular protection liquid is filled, the performance of the protection liquid in the whole annular after filling cannot be ensured to be consistent with the design index, so that the oil sleeve cannot be well protected.
Disclosure of Invention
The embodiment of the invention provides a method and a device for supplementing annular protection liquid, and particularly calculates the volume and the concentration of the annular protection liquid to be filled, so that the performance of the protection liquid in the whole annulus after filling is ensured to be consistent with design indexes, and the protection effect of the annular protection liquid on an oil casing is improved.
The annular protection fluid supplementing method comprises the following steps:
acquiring basic data of an annulus fluid infusion well;
acquiring the liquid level height of the annular protection liquid;
determining the volume of the natural gas in the air of the oil collar according to the basic data of the annular fluid infusion well and the liquid level height of the annular protection fluid;
determining the volume and concentration of the required annular protection liquid according to the volume of the natural gas in the air of the oil collar;
and performing fluid replacement operation according to the volume and the concentration of the required annular protection fluid.
This annular space protection fluid replacement device includes:
the basic data acquisition module is used for acquiring basic data of the annulus fluid infusion well;
the liquid level height acquisition module is used for acquiring the liquid level height of the annular protection liquid;
the natural gas volume determining module is used for determining the volume of the natural gas in the air of the oil collar according to the basic data of the annular fluid replenishing well and the liquid level height of the annular protection fluid;
the volume and concentration determination module of the protection liquid is used for determining the volume and concentration of the required annular protection liquid according to the volume of the natural gas in the air of the oil jacket ring;
and the fluid supplementing control operation module is used for performing fluid supplementing operation according to the volume and the concentration of the required annular protection fluid.
In the embodiment of the invention, through the steps of obtaining basic data of the annular fluid infusion well, measuring the liquid level height of the annular protection fluid, calculating the volume of the annular natural gas, calculating the volume and concentration of the injected protection fluid and the like, the performance of the protection fluid in the whole annulus is ensured to be consistent with the design index after the annular protection fluid is injected, and the protection effect of the annular protection fluid on an oil casing is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for replenishing an environmental protection fluid according to an embodiment of the present invention;
fig. 2 is a structural block diagram of an annular space protection liquid replenishing device provided in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In an embodiment of the present invention, a method for replenishing an environmental protection solution is provided, as shown in fig. 1, the method includes:
step 101: acquiring basic data of an annulus fluid infusion well;
step 102: acquiring the liquid level height of the annular protection liquid;
step 103: determining the volume of the natural gas in the air of the oil collar according to the basic data of the annular fluid infusion well and the liquid level height of the annular protection fluid;
step 104: determining the volume and concentration of the required annular protection liquid according to the volume of the natural gas in the air of the oil collar;
step 105: and performing fluid replacement operation according to the volume and the concentration of the required annular protection fluid.
During specific implementation, collect the basic data of annular fluid infusion well, include: well data, production data, and protection fluid data. The well data mainly refers to the inner diameter of an oil pipe, the outer diameter of the oil pipe, the outer diameter of a sleeve and the wall thickness of the oil pipe of the well, the height of annular nitrogen (when a nitrogen cushion is filled in the annular space of a gas storage well), the annular pressure of the oil sleeve, the components of production fluid and the like; the production data mainly refers to well head temperature, well head pressure, well bottom temperature, producing layer depth, gas production rate, liquid production amount and the like in a certain stable stage; the data of the protective solution mainly refers to a formula, and comprises the mass percent of each component.
In specific implementation, after the data is obtained, the liquid level of the annular protection fluid needs to be measured (step 102).
Specifically, at the wellhead, the liquid level of the annular protection liquid is measured by using a liquid level testing device. The liquid level testing device has a plurality of devices, and the testing device which is simple and convenient and meets the precision requirement can be adopted.
In specific implementation, the volume of the natural gas in the air of the oil jacket ring is calculated in the following manner (step 103).
Firstly, according to the outer diameter of the oil pipe, the outer diameter of the casing pipe and the wall thickness of the pipe, the cross-sectional area of the oil casing annulus can be determined:
wherein: a-annular cross-sectional area, m2；
d is the external diameter of the sleeve, m;
τ -casing wall thickness, m;
φt-tubing outside diameter, m.
The volume of the gas-containing space at the upper part of the annulus can be obtained by measuring the liquid level height of the annulus in combination:
V1＝Ah (2)
wherein: v1-volume of gas-containing annulus, m3；
A-annular cross-sectional area, m2；
h is the annular liquid level height m.
And then, calculating the annular temperature of the oil casing by using data such as the inner diameter of the oil pipe, the temperature of the wellhead, the pressure of the wellhead, the temperature of the bottom of the well, fluid components, gas production, liquid production and the like through professional multiphase flow calculation software (pipeline and the like). Specifically, the oil jacket annular temperature can be determined according to a temperature profile from the wellhead to the annular protection liquid level, or according to the temperature of any point in the range from the wellhead to the annular protection liquid level. If the measured temperature profile is not convenient to obtain, the wellhead temperature can be used instead. Taking the wellhead pressure as the pressure of the whole gas-containing annulus.
And finally, obtaining the volume of the gas in the gas-containing annulus under the standard condition according to the gas state equation according to the pressure of the oil-containing annulus, the volume of the gas-containing space at the upper part of the oil-containing annulus and the temperature of the oil-containing annulus. According to the gas state equation, when the amount of the gas of a certain substance changes from one state to another state, the ratio of the product of the pressure and the volume to the product of the temperature and the volume deviation coefficient is kept constant, and corresponding to the method, the method can obtain the following steps:
wherein:
P1-annular pressure, MPa;
V1-volume of gas-containing annulus, m3；
z1-volume deviation factor, dimensionless;
T1-annulus temperature, K;
P2-atmospheric pressure, 0.1 MPa;
V2volume under standard condition, m3；
T2Room temperature, 273K;
z2and the volume deviation coefficient under the standard condition has no dimension.
In the calculation process, if the temperature variation range from the wellhead to the liquid level of the annular protection liquid is +/-10 ℃, the average value can be taken as the temperature of the whole gas-containing annulus. If the temperature change of the liquid level of the wellhead and the annulus is large, the calculation can be carried out in an integral mode, namely segmented calculation, and finally the volume of the gas in the whole gas-containing annulus under the standard condition is obtained.
The gas-containing ring volume refers to the ring volume containing the natural gas, and the volume under the standard condition refers to the volume of the natural gas under the standard condition. When the gas storage well is filled with 100-200m nitrogen pads in the annulus, the gas in the gas-containing annulus is referred to as including natural gas and nitrogen leaked from the oil pipe into the annulus. The volume of the nitrogen pad under standard conditions needs to be obtained by using the formula (3). The volume of the natural gas in the gas-containing annulus under standard conditions can be obtained:
V＝V2-VN2 (4)
wherein: v-volume of natural gas in gas-containing annulus under standard conditions, m3；
V2Volume of gas in the gas-containing annulus under standard conditions, m3；
VN2Nitrogen cushion nitrogen volume under standard conditions, m3。
In particular, the volume and concentration of the annular protective fluid required is determined (step 104) as follows.
When the nitrogen cushion is not filled at the beginning, the depth of the protection liquid to be filled can be obtained by combining the measured liquid level height of the annular protection liquid; when the nitrogen cushion is filled at the beginning, the liquid level height of the annular protection liquid is measured and the length of the originally designed nitrogen cushion is combined, so that the depth of the protection liquid to be filled can be obtained; then, determining the volume of the annular protection liquid to be filled according to the cross section area of the oil sleeve annulus and the depth of the annular protection liquid to be filled; and determining the concentration of the annular protection liquid to be filled according to the volume of the oil jacket ring air natural gas under the standard condition, the volume of the annular protection liquid to be filled and the mass percentage of each component in the annular protection liquid.
According to the most conservative estimate, the natural gas in the gas-containing annulus is considered to have reacted with the annulus protection fluid and consumed the active ingredients in the protection fluid. Here, mainly corrosive media such as carbon dioxide. The volume of corrosive media such as carbon dioxide can be derived from the volume and gas composition of the natural gas in the annulus. And calculating the consumable effective ingredients of the corrosive media such as the carbon dioxide and the like according to the formula of the annular protection liquid. The calculation method is calculated according to the chemical reaction equation of each component and corrosive media such as carbon dioxide. And combining the formula of the original protection solution to obtain the concentration of the injected annular protection solution:
wherein: eta-concentration of some component in the annular space protective liquid, kg/m3；
m1-the mass of a component, kg, consumed by the natural gas in the annulus;
m2-the mass, kg, of a component in the original environmental protection liquid;
V3volume of annular protection fluid filled, m3。
At this point, the concentration of each component is obtained through calculation, and the annular protection fluid is reconfigured according to the volume needing to be filled.
Finally, the fluid replacement operation is performed according to the volume and concentration of the annulus protection fluid required in the following manner (step 105).
And (3) filling the annular space protection liquid from the oil sleeve annular space by adopting small discharge capacity (lower than the discharge capacity of the annular space protection liquid being replaced) until the annular space protection liquid of all designs is filled. And (4) reversely pumping nitrogen from the annulus to the design pressure (namely the final pressure required to be reserved in the annulus, generally about 5 MPa), and closing a wellhead valve to finish the filling of the protection liquid. This step can be performed automatically by the control device or manually by a technician.
Based on the same inventive concept, the embodiment of the invention also provides an annular protection liquid supplementing device, which is described in the following embodiment. Because the principle of the solution of the annular protection fluid supplementing device is similar to that of the annular protection fluid supplementing method, the implementation of the annular protection fluid supplementing device can refer to the implementation of the annular protection fluid supplementing method, and repeated parts are not described again. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 2 is a block diagram of a structure of an annulus protection fluid replenishing device according to an embodiment of the present invention, as shown in fig. 2, including:
a basic data obtaining module 201, configured to obtain basic data of an annulus fluid infusion well;
the liquid level height acquisition module 202 is used for acquiring the liquid level height of the annular protection liquid;
the natural gas volume determining module 203 is used for determining the volume of the natural gas in the air of the oil collar according to the basic data of the annulus fluid replenishing well and the liquid level height of the annulus protection fluid;
the volume and concentration determination module 204 is used for determining the volume and concentration of the required annular protection liquid according to the volume of the natural gas in the air of the oil collar;
and the fluid replacement control operation module 205 is used for performing fluid replacement operation according to the volume and the concentration of the required annular protection fluid.
This structure will be explained below.
In specific implementation, the basic data comprises well data, production data and annular protection fluid data;
the well data includes tubing inside diameter, tubing outside diameter, casing outside diameter and wall thickness, tubing annulus pressure, and composition of production fluid;
the production data comprises wellhead temperature, wellhead pressure, bottom temperature, producing zone depth, gas production rate and liquid production rate in a stable stage;
the data of the annular protection fluid comprises the mass percentage of each component in the annular protection fluid.
In a specific implementation, the natural gas volume determination module 203 is specifically configured to:
determining the cross-sectional area of the oil sleeve annulus according to the outer diameter of the oil pipe, the outer diameter of the casing pipe and the thickness of the pipe wall;
determining the volume of a gas-containing space at the upper part of the oil sleeve annulus according to the cross section area of the oil sleeve annulus and the liquid level height of the annulus protection liquid;
determining the annular temperature of the oil sleeve according to the inner diameter of the oil pipe and the production data;
and determining the volume of the natural gas in the oil sleeve ring air under the standard condition according to the oil sleeve annular pressure, the volume of the gas-containing space at the upper part of the oil sleeve annular and the oil sleeve annular temperature.
In specific implementation, the volume and concentration determining module 204 of the protection solution is specifically configured to:
determining the depth of the annular protection liquid to be filled according to the liquid level height of the annular protection liquid;
determining the volume of the annular protection liquid to be filled according to the cross sectional area of the oil sleeve annulus and the depth of the annular protection liquid to be filled;
and determining the concentration of the annular protection liquid to be filled according to the volume of the oil jacket ring air natural gas under the standard condition, the volume of the annular protection liquid to be filled and the mass percentage of each component in the annular protection liquid.
When the gas storage well is filled with a nitrogen cushion in the annulus, the well data also comprises the height of the nitrogen cushion in the air of the oil sleeve ring, and the volume of the gas containing space at the upper part of the oil sleeve annulus comprises the volume of natural gas and the volume of the nitrogen cushion;
the natural gas volume determination module 203 is specifically configured to:
determining the volume of gas in the gas-containing annulus under the standard condition and the volume of a nitrogen pad under the standard condition according to the pressure of the oil sleeve annulus, the volume of a gas-containing space at the upper part of the oil sleeve annulus and the temperature of the oil sleeve annulus;
subtracting the volume of the nitrogen cushion under the standard condition from the volume of the gas in the gas-containing annulus under the standard condition to obtain the volume of the natural gas in the air of the oil sleeve ring under the standard condition;
the volume and concentration determination module 204 of the protection solution is specifically configured to:
and determining the depth of the annular protection liquid required to be filled according to the liquid level height of the annular protection liquid and the height of the nitrogen cushion.
In a specific implementation, the natural gas volume determination module 203 is specifically configured to: determining the cross-sectional area of the oil sleeve annulus according to the formula (1); the volume of the gas-containing space above the annulus is determined according to equation (2).
In specific implementation, the volume and concentration determining module 204 of the protection solution is specifically configured to: and (5) determining the concentration of the annular protection fluid to be filled according to the formula (5).
In conclusion, the method ensures that the performance of the protective liquid in the whole annulus is consistent with the design index after filling through the steps of liquid level measurement, calculation of the volume of the annulus natural gas, calculation of the concentration and the dosage of the filling protective liquid, annulus fluid infusion and the like, improves the protective effect of the annulus protective liquid on an oil casing, ensures the safety of a gas well and a tubular column of an injection and production well, ensures the safe operation of the gas field and a gas storage reservoir, and solves the problem that the performance of the protective liquid in the whole annulus after filling cannot be ensured to be consistent with the design index by the conventional annulus fluid infusion method.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. The method for supplementing the environmental protection liquid is characterized by comprising the following steps:
acquiring basic data of an annulus fluid infusion well;
acquiring the liquid level height of the annular protection liquid;
determining the volume of the natural gas in the air of the oil collar according to the basic data of the annular fluid infusion well and the liquid level height of the annular protection fluid;
determining the volume and concentration of the annular protection liquid to be filled according to the volume of the natural gas in the air of the oil collar, the mass percentages of gas components and all components in the annular protection liquid;
and (4) performing fluid replacement operation according to the volume and concentration of the annular protection fluid required to be filled.
2. The annulus protection fluid replacement method of claim 1, wherein the base data comprises well data, production data, and annulus protection fluid data;
the well data includes tubing inside diameter, tubing outside diameter, casing outside diameter and wall thickness, tubing annulus pressure, and composition of production fluid;
the production data comprises wellhead temperature, wellhead pressure, bottom temperature, producing zone depth, gas production rate and liquid production rate in a stable stage;
the data of the annular protection fluid comprises the mass percentage of each component in the annular protection fluid.
3. The annulus protection fluid replacement method according to claim 2, wherein determining the volume of natural gas in the air of the oil collar according to the basic data of the annulus protection fluid well and the liquid level height of the annulus protection fluid comprises:
determining the cross-sectional area of the oil sleeve annulus according to the outer diameter of the oil pipe, the outer diameter of the casing pipe and the thickness of the pipe wall;
determining the volume of a gas-containing space at the upper part of the oil sleeve annulus according to the cross section area of the oil sleeve annulus and the liquid level height of the annulus protection liquid;
determining the annular temperature of the oil sleeve according to the inner diameter of the oil pipe and the production data;
and determining the volume of the natural gas in the oil sleeve ring air under the standard condition according to the oil sleeve annular pressure, the volume of the gas-containing space at the upper part of the oil sleeve annular and the oil sleeve annular temperature.
4. The annulus protection fluid replenishing method according to claim 3, wherein determining the volume and concentration of the annulus protection fluid to be replenished according to the mass percentages of the volume of the natural gas in the air of the oil jacket ring, the gas components and the components in the annulus protection fluid comprises:
determining the depth of the annular protection liquid to be filled according to the liquid level height of the annular protection liquid;
determining the volume of the annular protection liquid to be filled according to the cross sectional area of the oil sleeve annulus and the depth of the annular protection liquid to be filled;
determining the volume of a corrosive medium in the natural gas according to the volume of the natural gas in the oil jacket ring air under a standard condition and the gas components;
determining the mass of components in the corrosion medium consumption protection liquid according to the volume of the corrosion medium in the natural gas and the mass percentage of each component in the annular protection liquid;
and determining the concentration of the annular protection liquid to be filled according to the mass of the components in the corrosion medium consumption protection liquid, the volume of the annular protection liquid to be filled and the mass percentage of each component in the annular protection liquid.
5. The annulus protection fluid replacement method according to claim 4, wherein when the gas storage well fills the annulus with a nitrogen pad, the well data further includes the air nitrogen pad height of the oil jacket annulus, and the volume of the gas containing space above the oil jacket annulus includes the natural gas volume and the nitrogen pad volume;
according to oil jacket annular pressure, the volume and the oil jacket annular temperature in the empty gas containing space in oil jacket annular upper portion, confirm the volume of the aerial natural gas of oil jacket ring under the standard condition, include:
determining the volume of gas in the gas-containing annulus under the standard condition and the volume of a nitrogen pad under the standard condition according to the pressure of the oil sleeve annulus, the volume of a gas-containing space at the upper part of the oil sleeve annulus and the temperature of the oil sleeve annulus;
subtracting the volume of the nitrogen cushion under the standard condition from the volume of the gas in the gas-containing annulus under the standard condition to obtain the volume of the natural gas in the air of the oil sleeve ring under the standard condition;
determining the depth of the annular protection liquid required to be filled according to the liquid level height of the annular protection liquid, and the method comprises the following steps:
and determining the depth of the annular protection liquid required to be filled according to the liquid level height of the annular protection liquid and the height of the nitrogen cushion.
6. The annulus protection fluid replacement method of claim 3, wherein the cross-sectional area of the oil jacket annulus is determined according to the following formula:
wherein A represents the cross-sectional area of the annulus, m2(ii) a d represents the outer diameter of the sleeve, m; τ represents the casing wall thickness, m; phi is atRepresents the outer diameter of the oil pipe, m;
the volume of the gas-containing space above the annulus is determined according to the following formula:
V1＝Ah；
wherein: v1Represents the volume of the gas-containing space at the upper part of the oil sleeve annulus, m3(ii) a A represents the cross-sectional area of the annulus, m2(ii) a h represents the annulus level, m.
7. The annulus protection fluid replacement method according to claim 4, wherein the concentration of the annulus protection fluid to be filled is determined according to the following formula:
wherein eta represents any one of the annular space protective liquidsConcentration in terms of minute, kg/m3；m1Mass, kg, representing the consumption of the corresponding component of the natural gas in the annulus; m is2The mass, kg, of the corresponding components in the original environment-friendly protective solution is shown; v3Indicating the volume of annulus protection fluid filled, m3。
8. The utility model provides an empty protective liquid fluid infusion device of ring which characterized in that includes:
the basic data acquisition module is used for acquiring basic data of the annulus fluid infusion well;
the liquid level height acquisition module is used for acquiring the liquid level height of the annular protection liquid;
the natural gas volume determining module is used for determining the volume of the natural gas in the air of the oil collar according to the basic data of the annular fluid replenishing well and the liquid level height of the annular protection fluid;
the volume and concentration determination module of the protection liquid is used for determining the volume and concentration of the annular protection liquid to be filled according to the volume of the natural gas in the air of the oil jacket ring, the mass percentages of gas components and all components in the annular protection liquid;
and the fluid infusion control operation module is used for carrying out fluid infusion operation according to the volume and concentration of the annular protection fluid to be filled.
9. The annulus protection fluid replacement device of claim 8, wherein the base data comprises well data, production data, and annulus protection fluid data;
the well data includes tubing inside diameter, tubing outside diameter, casing outside diameter and wall thickness, tubing annulus pressure, and composition of production fluid;
the production data comprises wellhead temperature, wellhead pressure, bottom temperature, producing zone depth, gas production rate and liquid production rate in a stable stage;
the data of the annular protection fluid comprises the mass percentage of each component in the annular protection fluid.
10. The annulus protection fluid replenishing device of claim 9, wherein the natural gas volume determining module is specifically configured to:
determining the cross-sectional area of the oil sleeve annulus according to the outer diameter of the oil pipe, the outer diameter of the casing pipe and the thickness of the pipe wall;
determining the volume of a gas-containing space at the upper part of the oil sleeve annulus according to the cross section area of the oil sleeve annulus and the liquid level height of the annulus protection liquid;
determining the annular temperature of the oil sleeve according to the inner diameter of the oil pipe and the production data;
and determining the volume of the natural gas in the oil sleeve ring air under the standard condition according to the oil sleeve annular pressure, the volume of the gas-containing space at the upper part of the oil sleeve annular and the oil sleeve annular temperature.
11. The annulus protection fluid replacement device of claim 10, wherein the volume and concentration determination module of the protection fluid is specifically configured to:
determining the depth of the annular protection liquid to be filled according to the liquid level height of the annular protection liquid;
determining the volume of the annular protection liquid to be filled according to the cross sectional area of the oil sleeve annulus and the depth of the annular protection liquid to be filled;
determining the volume of a corrosive medium in the natural gas according to the volume of the natural gas in the oil jacket ring air under a standard condition and the gas components;
determining the mass of components in the corrosion medium consumption protection liquid according to the volume of the corrosion medium in the natural gas and the mass percentage of each component in the annular protection liquid;
and determining the concentration of the annular protection liquid to be filled according to the mass of the components in the corrosion medium consumption protection liquid, the volume of the annular protection liquid to be filled and the mass percentage of each component in the annular protection liquid.
12. The annulus protection fluid replacement device of claim 11, wherein when a gas storage well fills a nitrogen pad in the annulus, the well data further includes an oil jacket ring air nitrogen pad height, and the volume of the gas containing space above the oil jacket annulus includes a natural gas volume and a nitrogen pad volume;
the natural gas volume determination module is specifically configured to:
determining the volume of gas in the gas-containing annulus under the standard condition and the volume of a nitrogen pad under the standard condition according to the pressure of the oil sleeve annulus, the volume of a gas-containing space at the upper part of the oil sleeve annulus and the temperature of the oil sleeve annulus;
subtracting the volume of the nitrogen cushion under the standard condition from the volume of the gas in the gas-containing annulus under the standard condition to obtain the volume of the natural gas in the air of the oil sleeve ring under the standard condition;
the volume and concentration determination module of the protective solution is specifically configured to:
and determining the depth of the annular protection liquid required to be filled according to the liquid level height of the annular protection liquid and the height of the nitrogen cushion.
13. The annulus protection fluid replenishing device of claim 10, wherein the natural gas volume determining module is specifically configured to:
the cross-sectional area of the oil jacket annulus is determined according to the following formula:
wherein A represents the cross-sectional area of the annulus, m2(ii) a d represents the outer diameter of the sleeve, m; τ represents the casing wall thickness, m; phi is atRepresents the outer diameter of the oil pipe, m;
the volume of the gas-containing space above the annulus is determined according to the following formula:
V1＝Ah；
wherein: v1Represents the volume of the gas-containing space at the upper part of the oil sleeve annulus, m3(ii) a A represents the cross-sectional area of the annulus, m2(ii) a h represents the annulus level, m.
14. The annulus protection fluid replacement device of claim 11, wherein the volume and concentration determination module of the protection fluid is specifically configured to:
determining the concentration of the annular protection fluid to be filled according to the following formula:
wherein eta represents the concentration of any component in the annular space protective liquid, kg/m3；m1Mass, kg, representing the consumption of the corresponding component of the natural gas in the annulus; m is2The mass, kg, of the corresponding components in the original environment-friendly protective solution is shown; v3Indicating the volume of annulus protection fluid filled, m3。
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