CN113624391B - H in oil field gathering and transportation pipeline 2 S and CO 2 Method for obtaining partial pressure - Google Patents
H in oil field gathering and transportation pipeline 2 S and CO 2 Method for obtaining partial pressure Download PDFInfo
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- CN113624391B CN113624391B CN202010381611.0A CN202010381611A CN113624391B CN 113624391 B CN113624391 B CN 113624391B CN 202010381611 A CN202010381611 A CN 202010381611A CN 113624391 B CN113624391 B CN 113624391B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
- G01N21/783—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour for analysing gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
Abstract
The invention discloses an H in an oil field gathering and transportation pipeline 2 S and CO 2 A partial pressure obtaining method belongs to the field of pipeline corrosion prevention. The method comprises the following steps: acquiring the pipeline pressure and the pipeline temperature inside an oil field gathering and transportation pipeline; sampling a sample from a sampling port of an oil field gathering and transportation pipeline, and obtaining the volume of a gas sample and the volume of a liquid sample contained in the sample; measuring H in a gas sample 2 S gas content and CO 2 Gas content, and simultaneously acquiring the environmental pressure and the environmental temperature of the environment for measurement; based on the parameters, H in the oil field gathering and transportation pipeline is obtained respectively 2 Partial pressure of S and CO 2 Partial pressure of (c). The method can obtain H in the gathering and transportation pipeline of the oil field 2 S and CO 2 Accurate partial pressure under the condition of temperature and pressure.
Description
Technical Field
The invention relates to the field of pipeline corrosion prevention, in particular to an H in an oil field gathering and transportation pipeline 2 S and CO 2 And a partial pressure obtaining method.
Background
At present, contains H 2 S、CO 2 More and more oil fields, H 2 S、CO 2 Under the coexistence condition, the internal corrosion of the oil field gathering and transportation pipeline is easily caused. Research shows that H is in the gathering and transportation pipeline of the oil field 2 S、CO 2 Partial pressure is a key factor in determining the degree of corrosion in the pipeline, so that the H in the pipeline is obtained 2 S and CO 2 Partial pressure ofAs necessary.
In the prior art, H in gas phase after temperature reduction and pressure reduction is carried out on the sampling port of an oil field gathering and transportation pipeline on the site of an oil field 2 S and CO 2 The partial pressure of the pressure is used as H in the pipeline under the state of temperature and pressure 2 S and CO 2 Partial pressure.
In the process of implementing the invention, the inventor finds that the prior art has at least the following technical problems:
due to the influence of temperature and pressure, H in the gas phase is reduced in temperature and pressure 2 S and CO 2 The partial pressures are significantly different from their actual partial pressures in the pipeline, which can cause H pairs 2 S and CO 2 The difference of the corrosion cognition in the oil field gathering and transportation pipeline under the coexistence condition can even cause misjudgment, so that the pipeline is corroded and perforated.
Disclosure of Invention
In view of the above, the present invention provides an H in an oil field gathering and transportation pipeline 2 S and CO 2 The partial pressure obtaining method can obtain H in the oil field gathering and transportation pipeline under the condition of temperature and pressure 2 S and CO 2 The exact partial pressure of (a).
Specifically, the method comprises the following technical scheme:
h in oil field gathering and transportation pipeline 2 S and CO 2 A method of obtaining partial pressure, the method comprising:
acquiring the pipeline pressure and the pipeline temperature inside the oilfield gathering and transportation pipeline;
sampling a sample from a sampling port of the oilfield gathering and transportation pipeline, and acquiring the volume of a gas sample and the volume of a liquid sample contained in the sample;
measuring H in the gas sample 2 S gas content and CO 2 Gas content, simultaneously obtaining the ambient pressure and ambient temperature of the environment in which the measurements are made;
based on the parameters, respectively obtaining H in the oil field gathering and transportation pipeline through the following formula 2 Partial pressure of S and CO 2 Partial pressure of (a);
wherein, P CO2(T1) For CO inside the gathering and transportation pipeline of the oil field 2 Partial pressure;
P H2S(T1) for H inside gathering and transportation pipeline of oil field 2 S, partial pressure;
V g is the volume of the gas sample;
V L is the volume of the liquid sample;
T 0 is ambient temperature, P 0 Is at ambient pressure;
T 1 is the temperature of the pipeline, P 1 Is the pipeline pressure;
K CO2(T0) at a temperature of T 0 CO of 2 The solution equilibrium constant of the gas;
K CO2(T1) at a temperature of T 1 CO of 2 The solution equilibrium constant of the gas;
K H2S(T0) at a temperature of T 0 H of 2 S gas dissolution equilibrium constant;
K H2S(T1) at a temperature of T 1 H of 2 S gas dissolution equilibrium constant;
x H2S as H in gas samples 2 S content, mol%;
x CO2 as CO in gas samples 2 Content, mol%.
In one possible implementation, the obtaining a volume of the gas sample and a volume of the liquid sample contained in the sample includes:
placing the sample obtained from the sampling port into a transparent sampling bottle with scales, sealing and standing;
standing for a set time until gas and liquid in the sample are layered;
the volume of the gas sample and the volume of the liquid sample are read separately.
In one possible implementation, the H in the gas sample is measured by using gas chromatography or a colorimetric tube method, respectively 2 S gas content and CO 2 Gas content.
In one possible implementation, the
Obtained by the following formula:
in one possible implementation, the
Obtained by the following formula:
in one possible implementation, the K CO2(T0) And said K CO2(T1) Are obtained by the following formula:
wherein I is the ionic strength in the liquid sample;
t is T 0 Or T 1 。
In one possible implementation, the ionic strength I in the liquid sample is obtained by the following formula:
wherein m is i Is the ion concentration of the i ion in the liquid sample;
z i is the valence state of i ion in the liquid sample;
the i ions include: mg (magnesium) 2+ 、Ca 2+ 、K + 、Na + 、Cl - 、CO 3 2- 、HCO 3 - And SO 4 2- Ions.
In one possible implementation, the ion concentration of i ions in the liquid sample is measured by a spectrophotometer.
In one possible implementation, the K H2S(T0) And said K H2S(T1) Are obtained by the following formula:
wherein I is the ionic strength in the liquid sample;
t is T 0 Or T 1 。
In one possible implementation, the pipeline pressure and the pipeline temperature are obtained by a pressure gauge and a temperature gauge assembled on the oilfield gathering and transportation pipeline, respectively.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
the method provided by the embodiment of the invention is based on a gas state equation and a substance quantity conservation principle, combines gas dissolution balance, and utilizes the following parameters obtained by measurement: measuring ring for measuring pipeline pressure and pipeline temperature and reducing temperature and pressure inside oil field gathering and transportation pipelineAmbient pressure and ambient temperature of the environment, volume of gas sample and volume of liquid sample contained in the sample, and H in the gas sample 2 S gas content and CO 2 Gas content, calculating the gas fugacity coefficient and H 2 S gas and CO 2 Respectively calculating the dissolved equilibrium constant of the gas by using a formula (1) and a formula (2) to obtain H in the oil field gathering and transportation pipeline 2 Partial pressure of S and CO 2 Partial pressure of (c). The embodiment of the invention provides a method for acquiring H in an oil field gathering and transportation pipeline 2 Partial pressure of S and CO 2 The partial pressure method of (3) is to measure the H in the gathering and transportation pipeline sample after temperature reduction and pressure reduction 2 S partial pressure and CO 2 Partial pressure reduction is carried out to obtain in-situ H in the state of temperature and pressure in the pipeline 2 S partial pressure and CO 2 Partial pressure, can obtain H in the oil field gathering and transportation pipeline in the in-situ state with high precision 2 S gas and CO 2 Partial pressure of gas, favouring H 2 S and CO 2 The corrosion in the oil field gathering and transportation pipeline under the coexistence condition can be more accurately known and judged, and the method has important significance for effectively controlling the corrosion of the pipeline.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 shows an embodiment of the present invention, which provides an H-channel in an oilfield gathering and transportation pipeline 2 S and CO 2 A flow chart of a method for obtaining the partial pressure.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
The embodiment of the invention provides an H in an oil field gathering and transportation pipeline 2 S and CO 2 The method for obtaining the partial pressure is shown in the attached figure 1, and comprises the following steps:
step S1: acquiring pipeline pressure P inside oil field gathering and transportation pipeline 1 And pipe temperature T 1 。
Step S2: sampling from the sampling port of the oil field gathering and transportation pipeline to obtain the volume V of the gas sample contained in the sample g And volume V of liquid sample L 。
And step S3: measuring H in a gas sample 2 S gas content x H2S And CO 2 Gas content x CO2 Simultaneously acquiring the ambient pressure P of the environment in which the measurement is to be made 0 And ambient temperature T 0 。
And step S4: based on the parameters, the H in the oil field gathering and transportation pipeline is respectively obtained through the following formula (1) and formula (2) 2 Partial pressure of S and CO 2 Partial pressure of (a);
wherein, P CO2(T1) For CO inside oil field gathering and transportation pipeline 2 Partial pressure in Pa;
P H2S(T1) for H inside gathering and transportation pipeline of oil field 2 S partial pressure with the unit of Pa;
V g volume of gas sample in m 3 ；
V L Is the volume of the liquid sample in m 3 ；
T 0 Is the ambient temperature in units of K, P 0 Is ambient pressure in Pa;
T 1 is the temperature of the pipeline in units of K, P 1 Is the pipeline pressure in Pa;
K CO2(T0) at a temperature of T 0 CO of 2 The solution equilibrium constant of the gas;
K CO2(T1) at a temperature of T 1 CO of 2 The solution equilibrium constant of the gas;
K H2S(T0) at a temperature of T 0 H 2 S gas dissolution equilibrium constant;
K H2S(T1) at a temperature of T 1 H 2 S gas dissolution equilibrium constant;
x H2S as H in gas samples 2 S content, mol%;
x CO2 as CO in gas samples 2 Content, mol%;
r is an ideal gas constant and has a value of 8.314 J.mol -1 ·K -1 。
The method provided by the embodiment of the invention is based on a gas state equation and a quantity conservation principle of substances, combines gas dissolution balance, and utilizes the following parameters obtained by measurement: pipeline pressure and pipeline temperature inside oilfield gathering and transportation pipeline, environmental pressure and environmental temperature of temperature-reducing and pressure-reducing measurement environment, volume of gas sample and volume of liquid sample contained in sample, and H in gas sample 2 S gas content and CO 2 Gas content, calculating the gas fugacity coefficient and H 2 S gas and CO 2 Respectively calculating the dissolved equilibrium constant of the gas by using a formula (1) and a formula (2) to obtain H in the oil field gathering and transportation pipeline 2 Partial pressure of S and CO 2 Partial pressure of (c). The embodiment of the invention provides a method for acquiring H in a gathering and transportation pipeline of an oil field 2 Partial pressure of S and CO 2 The partial pressure method of (1) is to measure H in the gathering and transportation pipeline sample after temperature and pressure reduction 2 S partial pressure and CO 2 Partial pressure reduction to pipeline internal temperature and pressureIn situ H in the State 2 S partial pressure and CO 2 Partial pressure, can obtain H in the oil field gathering and transportation pipeline in the in-situ state with high precision 2 S gas and CO 2 Partial pressure of gas, favouring H 2 S and CO 2 Under the coexistence condition, the corrosion in the oil field gathering and transportation pipeline can be accurately known and judged, and the method has important significance for effectively controlling the corrosion of the pipeline.
For step S1, the pressure gauge and the thermometer are assembled on the oil field gathering and transportation pipeline, and accurate pipeline pressure P can be obtained by reading the readings of the pressure gauge and the thermometer on the oil field gathering and transportation pipeline 1 And pipe temperature T 1 . The pressure P of the pipeline 1 And pipe temperature T 1 The pressure and the temperature in the oil field gathering and transportation pipeline can be accurately reflected.
Ambient pressure P for the environment in which the measurement is being made 0 And the ambient temperature T 0 Generally speaking, the two are outdoor atmospheric pressure and outdoor atmospheric temperature, respectively.
For step 2, after a sample is taken from the sampling port of the oilfield gathering and transportation pipeline, the volume of the gas sample and the volume of the liquid sample contained in the sample are obtained so as to facilitate the subsequent H pair 2 S gas content and CO 2 And (4) calculating the gas content.
Wherein the following method may be employed to obtain the volume of the gas sample and the volume of the liquid sample contained in the sample:
and (3) placing the sample obtained from the sampling port of the oil field gathering and transportation pipeline into a transparent sampling bottle with scales, sealing and standing, layering gas and liquid in the sample after standing for a set time, and reading the volume of the gas sample and the volume of the liquid sample respectively.
The method comprises the steps that a transparent sampling bottle with a known volume is filled with a sample, after a gas sample and a liquid sample are formed by gas-liquid layering, the volume of the liquid sample is directly read by using scales, and the volume of the liquid sample is subtracted from the volume of the sampling bottle, so that the volume of the gas sample can be obtained.
It is understood that the gases in the gas sample include, but are not limited to: h 2 S gas and CO 2 A gas; as described aboveThe liquid sample is essentially an oilfield production fluid.
In step 3, for H contained in the gas sample 2 S gas and CO 2 The content of gas can be measured by gas chromatography or colorimetric tube method (colorimetric method for short) to obtain H in gas sample 2 S gas content and CO 2 Gas content, i.e. H 2 S gas in mol% of the gas sample, and, CO 2 The gas represents mol% of the gas sample.
For gas chromatography, a gas chromatograph is used and a gas sample is introduced by injection or automatically, carried by a carrier gas through a separation column and to a detector for detection. Due to H 2 S gas and CO 2 The time for the gas to pass through the separation column is different, and the concentration is proportional to the detection signal, so that the H in the gas sample can be accurately obtained 2 S gas content and CO 2 Gas content.
For the colorimetric cylinder method, gas samples are directly and respectively sucked from a sampling bottle twice, the sucked gas samples are respectively led into a colorimetric cylinder containing a specific chemical reagent, and H 2 S gas and CO 2 The gas respectively presents different colors after reacting with specific chemical reagent, and H can be obtained according to the presented color because the presented color has a proportional relation with the concentration 2 S gas content and CO 2 Gas content.
The manner in which the gas fugacity coefficient and the solution equilibrium constant are obtained is described below:
for a temperature of T 0 Pressure of P 0 Gas fugacity coefficient of
Can be obtained by the following formula (3):
for a temperature of T 1 Pressure of P 1 Coefficient of gas fugacity
Can be obtained by the following formula (4):
for CO 2 Gas at a temperature T 0 And a temperature T 1 Solution equilibrium constant K of CO2(T0) And K CO2(T1) Both are obtained by the following formula (5):
wherein I is the ionic strength in the liquid sample; t is T 0 Or T 1 。
T is T 0 Time, K calculated CO2(T) Is K CO2(T0) ；
T is T 1 Time, K calculated CO2(T) Is K CO2(T1) 。
For the ionic strength I in the liquid sample referred to above, it can be obtained by the following formula (6):
wherein m is i Is the ion concentration of the i ion in the liquid sample;
z i is the valence state of i ion in the liquid sample;
the i ions include: mg (Mg) 2+ 、Ca 2+ 、K + 、Na + 、Cl - 、CO 3 2- 、HCO 3 - And SO 4 2- Ions.
The method provided by the embodiment of the invention fully considers the common separation in the gathering and transportation pipeline of the oil fieldSeeds, e.g. Mg 2+ 、Ca 2 + 、K + 、Na + 、Cl - 、CO 3 2- 、HCO 3 - And SO 4 2- Influence of ions, calculating CO by the ionic strength of the above ions in the liquid sample 2 The solution equilibrium constant of the gas can be obviously improved in such a way that the H in the oil field gathering and transportation pipeline in an in-situ state can be obviously improved 2 S partial pressure and CO 2 The accuracy of the partial pressure calculation.
Wherein the ion concentration m of i ions in the liquid sample i Can be measured by a spectrophotometer.
For H 2 S gas at temperature T 0 And a temperature T 1 Solution equilibrium constant K of H2S(T0) And K H2S(T1) Both are obtained by the following formula (7):
wherein T is T 0 Or T 1 。
T is T 0 Then, K is calculated H2S(T) Is K H2S(T0) ；
T is T 1 Then, K is calculated H2S(T) Is K H2S(T1) 。
The invention will be further described by the following specific examples:
step 1, researching a gathering and transportation pipeline of an oil field, and respectively acquiring the pipeline temperature T in the pipeline by using a thermometer and a pressure gauge on the gathering and transportation pipeline of the oil field 1 At 50 ℃ and a pipeline pressure P 1 Is 10MPa.
And 2, taking a sample from the sampling port of the oilfield gathering and transportation pipeline by using a transparent sampling bottle with scales. After the sample is taken back to the laboratory and stands for 24 hours, the volume V of the gas sample is respectively read through the scale marks on the wall of the sampling bottle g 200ml, volume V of liquid sample L Is 300ml.
Step 3, gas is respectively detected by adopting gas chromatographyH in the body sample 2 S gas content x H2S And CO 2 Gas content x CO2 Respectively 2.5mol% and 5mol%, and simultaneously, respectively reading the indoor environment temperature T by a thermometer and a manometer 0 At 25 ℃ and an ambient pressure P 0 Is 1.1MPa.
Step 4, measuring the ion concentration m of various ions in the liquid sample by using a spectrophotometer i Respectively as follows: mg (magnesium) 2+ 800mol/L，Ca 2+ 550mol/L，K + 400mol/L，Na + 300mol/L，Cl - 500mol/L， CO 3 2- 250mol/L，HCO 3 - 300mol/L and SO 4 2- 350mol/L。
From the above ion concentrations, the ion intensity i was calculated to be 2700mol/L by the following formula (6).
Step 5, converting the units of the parameters into standard units, for example, converting the temperature from the DEG C to the K, and then obtaining the H in the oil field gathering and transportation pipeline according to the parameters of the standard units through the following formula (1) and formula (2) respectively 2 Partial pressure of S and CO 2 Partial pressure of (c):
wherein the temperature is T 0 Pressure of P 0 Coefficient of gas fugacity
Can be obtained by the following formula (3):
temperature of T 1 Pressure of P 1 Coefficient of gas fugacity
Can be obtained by the following formula (4):
CO 2 gas at a temperature T 0 And a temperature T 1 Solution equilibrium constant K of CO2(T0) And K CO2(T1) Both obtained by the following formula (5):
H 2 s gas at a temperature of T 0 And a temperature T 1 Solution equilibrium constant K H2S(T0) And K H2S(T1) Both obtained by the following formula (7):
the calculation result is as follows: in the oil field gathering and transportation pipeline, H is in an in-situ state (with temperature and pressure) 2 Partial pressure P of S H2S(T1) 0.11MPa, CO 2 Partial pressure P of CO2(T1) It was 0.055MPa.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. 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 (10)
1. H in oil field gathering and transportation pipeline 2 S and CO 2 The method for obtaining partial pressure is characterized by comprising the following steps:
acquiring the pipeline pressure and the pipeline temperature inside the oilfield gathering and transportation pipeline;
sampling a sample from a sampling port of the oilfield gathering and transportation pipeline, and acquiring the volume of a gas sample and the volume of a liquid sample contained in the sample;
measuring H in the gas sample 2 S gas content and CO 2 Gas content, simultaneously obtaining the ambient pressure and ambient temperature of the environment in which the measurements are made;
based on the parameters, respectively obtaining H in the oil field gathering and transportation pipeline through the following formula 2 Partial pressure of S and CO 2 Partial pressure of (a);
wherein, P CO2(T1) For CO inside the gathering and transportation pipeline of the oil field 2 Partial pressure;
P H2S(T1) for H inside gathering and transportation pipeline of oil field 2 S, voltage division;
V g is the volume of the gas sample;
V L is the volume of the liquid sample;
T 0 is ambient temperature, P 0 Is ambient pressure;
T 1 is the pipe temperature, P 1 Is the pipeline pressure;
K CO2(T0) at a temperature of T 0 CO of 2 The solution equilibrium constant of the gas;
K CO2(T1) at a temperature of T 1 CO of 2 The solution equilibrium constant of the gas;
K H2S(T0) at a temperature of T 0 H 2 S gas dissolution equilibrium constant;
K H2S(T1) at a temperature of T 1 H 2 S gas dissolution equilibrium constant;
x H2S as H in gas samples 2 S content, mol%;
x CO2 as CO in gas samples 2 Content, mol%.
2. The oilfield gathering and transportation pipeline internal H of claim 1 2 S and CO 2 A method for obtaining a partial pressure, wherein the obtaining of a volume of a gas sample and a volume of a liquid sample contained in the sample comprises:
placing the sample obtained from the sampling port into a transparent sampling bottle with scales, sealing and standing;
standing for a set time until gas and liquid in the sample are layered;
the volume of the gas sample and the volume of the liquid sample are read separately.
3. The oilfield gathering and transportation pipeline internal H of claim 1 2 S and CO 2 The method for obtaining partial pressure is characterized in that H in a gas sample is respectively measured and obtained by adopting a gas chromatography or a colorimetric tube method 2 S gas content and CO 2 Gas content.
4. The oilfield gathering and transportation pipeline internal H of claim 1 2 S and CO 2 Method for obtaining partial pressure, characterized in that
Obtained by the following formula: />
5. The oilfield gathering and transportation pipeline internal H of claim 1 2 S and CO 2 Method for obtaining partial pressure, characterized in that
Obtained by the following formula:
6. the oilfield gathering and transportation pipeline internal H of claim 1 2 S and CO 2 Method for obtaining partial pressure, characterized in that said K is CO2(T0) And said K CO2(T1) Are obtained by the following formula:
wherein I is the ionic strength in the liquid sample;
t is T 0 Or T 1 。
7. The oilfield gathering and transportation pipeline internal H of claim 6 2 S and CO 2 The method for obtaining partial pressure is characterized in that the ionic strength I in the liquid sample is obtained by the following formula:
wherein m is i Is the ion concentration of the i ion in the liquid sample;
z i is the valence state of i ion in the liquid sample;
the i ions include: mg (Mg) 2+ 、Ca 2+ 、K + 、Na + 、Cl - 、CO 3 2- 、HCO 3 - And SO 4 2- Ions.
8. The oilfield gathering and transportation pipeline internal H of claim 7 2 S and CO 2 A method for obtaining a partial pressure, characterized in that an ion concentration of i ions in the liquid sample is measured by a spectrophotometer.
9. The oilfield gathering and transportation pipeline internal H of claim 1 2 S and CO 2 Method for obtaining a partial pressure, characterized in that said K is H2S(T0) And said K H2S(T1) Are obtained by the following formula:
wherein I is the ionic strength in the liquid sample;
t is T 0 Or T 1 。
10. The oilfield gathering and transportation pipeline internal H of claim 1 2 S and CO 2 The method for obtaining the partial pressure is characterized in that the pipeline pressure and the pipeline temperature are respectively obtained through a pressure gauge and a thermometer which are assembled on the oil field gathering and transportation pipeline.
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