CN114320270B - CO in drilling fluid of high-temperature high-pressure stratum system 2 Content prediction method - Google Patents
CO in drilling fluid of high-temperature high-pressure stratum system 2 Content prediction method Download PDFInfo
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Abstract
The invention belongs to the technical field of petroleum exploration, and discloses CO in drilling fluid of a high-temperature high-pressure stratum system 2 A content prediction method. The invention uses the method of CO 2 Research on the action relation and logging evaluation of drilling fluid, and changing the pH value, temperature and pressure of the drilling fluid to simulate the underground shaft environment and summarize CO under the conditions 2 Law of influence of action with drilling fluid and calculate CO 2 The amount of reaction and dissolution in the drilling fluid. The method can build CO suitable for common drilling fluid 2 The dissolution amount calculation model is used for realizing quantitative evaluation of CO in the stratum in the process of high alkaline slurry drilling and logging operation 2 The content has great reference significance for judging the acidification degree of the drilling fluid and adding alkali.
Description
Technical Field
The invention belongs to the technical field of petroleum exploration, and in particular relates to CO in drilling fluid of a high-temperature high-pressure stratum system 2 Reaction experiment device and CO thereof 2 A content prediction method.
Background
High-temperature, high-pressure and high-acid oil and gas reservoirs become important alternative energy sources in China, and along with continuous deep petroleum and natural gas exploration and development, the successive investment and development of high-temperature, high-pressure and high-yield deep wells are carried out, so that the oil and gas exploitation environment is more and more severe. CO in China 2 The gas reservoir has large resource quantity and relatively rich distribution, and the mouth basin of the Oryza sativa, the Song sea and the Zhujiang in the southwest of China can be found to have high CO content 2 Due to CO 2 Chemical reaction characteristics, which lead to large deviation between the gas content in gas logging and the actual content of the stratum/shaft, even failure to detect CO 2 . Due to CO 2 The content can not be accurately detected, so that blowout accidents can be caused, and finally the drilling safety and well completion judgment are affected. At present, domestic and foreign scholars aim at CO 2 A great deal of research on solubility in solvents and dissolution rules is performed, and a relevant calculation model is established. However, these calculation models are mostly applied to the research of chemical engineering field problems such as purification, desulfurization and the like of natural gas or synthetic gas. Thus, CO in drilling fluids 2 Analysis and detection of the dissolution content become a problem to be solved in deep well drilling and logging work.
CN205607955U discloses a CO in crude oil 2 The system sequentially comprises an air injection part, an inlet pressure regulating part, a foam testing part and an outlet pressure regulating part, wherein the pressure in the transparent reaction kettle can be precisely controlled through the joint regulation of two-stage valves of the inlet pressure regulating part, the temperature of the transparent reaction kettle can be precisely controlled by utilizing circulating water between a constant-temperature water bath and a transparent water sleeve, and the CO injected into the reaction kettle can be precisely metered by utilizing a gas flowmeter 2 Volume, and thus obtain CO in crude oil at set temperature and pressure 2 Is a solvent for the polymer.
CN110110774A discloses a CO based on multi-model fusion 2 Method for predicting solubility in ionic liquids, which method uses the number of original samplesThe training set and the test set are divided, and then the ANN, SVM and ELM sub-models are established by using the training set. And a linear fusion model is established by adopting a method of minimizing the sum of squares of errors and an information entropy method respectively and is applied to test concentration, so as to test the prediction performance of the model. The research result obtained by the invention can accurately predict CO 2 The solubility in the ionic liquid provides an effective and feasible modeling method for predicting physical and chemical parameters of substances, and also provides important guidance for evaluating and screening the ionic liquid with high selectivity.
CN111157510A discloses an in situ on-line measurement of CO 2 The device of the invention comprises a confocal microscopic Raman spectrometer, a high-pressure ventilation pipeline, a circulating balance pipeline system, a cold and hot table and the like, and the invention utilizes the high-pressure ventilation pipeline to quantitatively supply CO in batches 2 CO injection in alkane systems 2 Detecting and recording CO 2 CO at gradient concentration 2 CO in alkane systems 2 The peak height ratio value of C-H stretching vibration peak of Fermi double bond and alkane is plotted as CO 2 The concentration is a standard curve with the abscissa and the peak height ratio is the ordinate, and then the CO is measured 2 Solubility in alkanes.
CN102621023a discloses a kind of CO 2 -a method for measuring solubility of a small molecule-polymer system, the quartz crystal microbalance device of the invention comprising a high-pressure cell and a frequency feedback device connected thereto; the quartz crystal microbalance is used for preparing CO by the micro-balance, and the micro-balance also comprises a small molecular pool, a gas supply device, a vacuum pump, a filtering device and at least one gas circulating pump 2 The solubility measurement is carried out on the small molecule-polymer system, the operation is simple, and the measured saturation solubility of the small molecule and the common saturation solubility of the small molecule and the carbon dioxide are accurate.
CN103454391a discloses a high CO content 2 The invention relates to a method for testing the solubility of natural gas in stratum water, which adopts an isothermal flash evaporation volumetric method to test CO at different temperatures 2 The solubility in pure water is compared with literature experimental data to verify the reliability of the new method; then testing different pressure and different CO at the formation temperature 2 Content dissolution of natural gas in formation waterDegree. To accurately find high C0 content 2 Gas reservoir phase parameters and CO 2 Effective burying provides important basic data and application value.
CN106093309a discloses supercritical CO under the condition of interface update 2 The device comprises a gas cylinder, a pressure reducing valve, a pressure digital display meter, a booster pump, an oil bath heating container, a pressure chamber 1, an overflow valve, an oil pump, a pressure sensor, a control system, a pressure chamber 2, a magnetic coupling, an external driving motor and a replaceable mixing element. The experimental device has the mutual influence on shearing rate, homogeneous phase rheological property, solubility and dissolution amount under different temperature and pressure conditions, and the supercritical CO is influenced by technological parameters such as temperature, pressure, rotating speed and the like and the structure of a mixing element 2 The effect of the dissolution rate in the polymer melt was investigated. Further validation of CO 2 New theory of dissolution and diffusion in polymer melt.
The above methods and most studies are mainly directed to CO 2 Solubility in organic solutions, polymers, most solubility calculation models are semi-empirical models, CO 2 The lack of solubility experimental value in aqueous solution is one of factors limiting model accuracy, and under high-temperature and high-pressure conditions, CO with high reliability 2 Solubility experimental data and CO in hydrocarbon reservoir exploration formations 2 Solubility in drilling fluids is low due to the lack of CO 2 Dissolution property research in drilling fluid, difficulty in accurately predicting CO 2 Content, and drilling fluid safety density window is very narrow, CO 2 After gas invasion, the well bore flow becomes complex, well kick, blowout and other underground accidents are easy to occur, and well drilling safety and well completion judgment are seriously affected.
Disclosure of Invention
The invention aims at CO appearing in a research area 2 The problem of great deviation between the gas logging value and the actual content in stratum well bore is to provide a predictive evaluation of CO in well stratum 2 Method for establishing content of CO suitable for common drilling fluid in research area 2 The dissolution amount calculation model is used in the process of drilling and logging in high alkaline mudRealizes quantitative evaluation of CO in stratum 2 Content provides technical services.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a CO 2 Reaction device for gas and high-temperature high-pressure stratum system drilling fluid, wherein the reaction device comprises CO 2 Gas steel bottle, intermediate container, booster pump, high-temperature high-pressure reaction kettle, CO 2 The gas outlet of the gas steel cylinder is connected with a 1# gas inlet valve at the top of the intermediate container through a pressure reducing valve, the 2# gas inlet valve at the bottom of the intermediate container is connected with a booster pump, the gas outlet of the intermediate container is connected with a gas inlet on the side wall of the high-temperature high-pressure reaction kettle through a 3# gas inlet valve, a stirring device and a heating device are arranged in the high-temperature high-pressure reaction kettle, a gas outlet valve is further arranged on the side wall of the high-temperature high-pressure reaction kettle, and a liquid outlet valve is arranged at the bottom of the high-temperature high-pressure reaction kettle.
Further, the pressure measuring and data displaying device is also included, and for example, the pressure measuring and data displaying device can display measuring result data and the like with a terminal such as a computer, a mobile phone and the like.
The invention particularly provides a method for utilizing the reaction device to carry out CO treatment on drilling fluid of a high-temperature high-pressure stratum system 2 The content prediction method comprises the following steps:
(1) Building CO 2 A gas and drilling fluid reaction device: by CO 2 The connection of the gas steel bottle, the intermediate container, the booster pump, the air compressor and the high-temperature high-pressure reaction kettle is used for building CO 2 A gas and drilling fluid reaction device;
(2)CO 2 the reaction process of the gas and the drilling fluid comprises the following steps: the pressure is kept constant by a booster pump, and CO in the reaction 2 The reduction of the gas volume is equal to the compression volume of the booster pump, and the compression factor method is adopted to calculate the CO at high temperature and high pressure 2 Gas reaction amount;
(3) Determination of drilling fluid and CO 2 Ion concentration changes before and after the reaction;
(4) Calculation of CO in drilling fluid Using multiple regression analysis 2 Solubility, study of reaction factors and CO 2 Correlation between solubility, get multiple regression equation, the said reaction factor includes ion concentration change, pH value, temperature, pressure;
(5) Substituting the reaction factors into the multiple regression equation obtained in the step (4) to predict the CO in the drilling fluid 2 Solubility of the polymer.
Further, CO in step (1) 2 The connection relation between the gas and the drilling fluid reaction device is as follows: CO 2 The gas outlet of the gas steel bottle is connected with the gas inlet of the intermediate container, the valve at the bottom of the intermediate container is connected with the booster pump, the gas outlet of the intermediate container is connected with the gas inlet on the side wall of the high-temperature high-pressure reaction kettle through the gas inlet valve, the stirring device and the heating device are arranged in the high-temperature high-pressure reaction kettle, the gas outlet is further arranged on the side wall of the high-temperature high-pressure reaction kettle, the gas outlet is connected with the gas outlet valve, the bottom of the high-temperature high-pressure reaction kettle is provided with the liquid outlet, and the liquid outlet is connected with the liquid outlet valve.
Further, the specific process in the step (2) is as follows: starting a booster pump, setting constant pressure of 5MPa, opening an air inlet valve of a high-temperature high-pressure reaction kettle communicated with an air outlet of an intermediate container when the pressure of the booster pump is increased to 5MPa, heating the high-temperature high-pressure reaction kettle, wherein the high-temperature high-pressure reaction kettle is in a pressurizing and heating process, starting a stirring device, controlling the rotating speed to be 600-700 revolutions per minute, and keeping the constant pressure of 5MPa for more than 2 hours; and then sequentially closing the booster pump and the stirring device, stopping heating the high-temperature high-pressure reaction kettle, slowly opening the gas outlet valve of the reaction kettle, opening the liquid outlet valve of the reaction kettle when the pressure of the reaction kettle is reduced to 0, receiving a test sample, collecting redundant drilling fluid, and pouring the redundant drilling fluid into a waste liquid pool.
Further, CO in the drilling fluid in the step (4) 2 The solubility calculation equation is:
C T ＝(n before the reaction -n After the reaction )/V Drilling fluid
C T For CO in drilling fluids 2 Solubility; v (V) Drilling fluid In m 3 ；
Wherein P is pressure, unit Mpa; t is temperature, and the unit is K; v is the volume, the unit is m 3 ；ZFor compression factor, z= 0.8972-0.063248x+0.004795y+0.00216 x 2 +8.041×10 -5 xy-1.58810 -6 y 2 -2.259×10 -5 x 3 -2.259×10 -6 x 2 y+3.211×10 -8 xy 2 +8.097×10 -8 x 4 +1.347×10 -8 x 3 y-2.679×10 -11 x 2 y 2 (R 2 ＝0.9915)
Wherein: x is pressure, unit is MPa, y is temperature, unit is K;
further, the multiple regression equation in step (4) is as follows:
three parameter equations: c (C) T ＝0.3663*pH+6.1303*[CO 3 2- ]+3.6302*[HCO 3 - ]，R 2 ＝0.7896；
Five parameter equations: c (C) T ＝0.0032*P+0.054*T-1.94*pH+47.96*[CO 3 2- ]+3.23*[HCO 3 - ]，R2＝0.8784；
Seven parameter equation: c (C) T ＝-0.2032*P+0.0896*T-2.4976*pH+77.9870*[CO 3 2- ]+9.5727*[HCO 3 - ]+0.0003*△[Ca 2+ ]+0.0112*△[Mg 2+ ]，R 2 ＝0.9126。
Preferably, in step (4), a plurality of the multiple regression equations are used for calculation to mutually verify.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a method for predicting and evaluating CO in a drilling stratum 2 Method for establishing content of CO suitable for common drilling fluid in research area 2 The dissolution amount calculation model is used for realizing quantitative evaluation of CO in the stratum in the process of high alkaline slurry drilling and logging operation 2 Content provides technical services.
2. The invention sequentially adopts temperature to CO 2 Solubility influence experiment in drilling fluid, pressure vs. CO 2 After five steps of solubility influence experiment in drilling fluid, drilling fluid water quality test evaluation, ion content determination in drilling fluid, rule analysis and prediction model establishment, temperature and pressure are inducedConditions such as concentration of each ion to CO 2 Influence law of action with drilling fluid is established based on ion concentration change CO 2 And a model for predicting chemical reaction quantity and dissolution quantity of drilling fluid. The method can be used for establishing CO suitable for common drilling fluid in research areas 2 The dissolution amount calculation model is used for realizing quantitative evaluation of CO in the stratum in the process of high alkaline slurry drilling and logging operation 2 The content provides technical service, and achieves the aim of avoiding exploration misjudgment and error well completion, reducing and even avoiding serious economic loss and safety accidents.
3. In actual operation, the [ CO ] is measured according to actual conditions 3 2- ]、[HCO 3 - ]、T、P、[Ca 2+ ]、[Mg 2+ ]And (3) carrying out prediction by adopting a regression equation, and averaging prediction results of several methods to realize tuning of the overall calculation result. Several regression equations (three-parameter equation, five-parameter equation and seven-parameter equation) are adopted for prediction, and meanwhile, the mutual verification function is achieved.
Drawings
FIG. 1 is CO 2 A schematic diagram of a gas and drilling fluid reaction device;
FIG. 2 is a graph showing compression factors at different pressure and temperatures.
In the figure, a 1-CO2 gas cylinder, a 11-pressure reducing valve 11, a 2-intermediate container, a 21-1# air inlet valve, a 22-2# air inlet valve, a 3-booster pump, a 4-high temperature high pressure reaction kettle, a 41-3# air inlet valve, a 42-air outlet valve, a 43-heating device, a 44-liquid outlet valve and a 45-stirring device are shown.
Detailed Description
The invention will now be illustrated by means of specific examples for a better understanding of the invention, without however being limited thereto.
1. Building CO 2 Gas and drilling fluid reaction device
CO 2 The reaction device of the gas and the high-temperature high-pressure stratum system drilling fluid is shown in figure 1, and comprises CO 2 A gas steel cylinder 1, an intermediate container 2, a booster pump 3 and a high-temperature high-pressure reaction kettle 4.CO 2 The gas outlet of the gas steel cylinder is connected with the No. 1 inlet at the top of the intermediate container through a pressure reducing valve 11The air valve 21, the 2# air inlet valve 22 of middle container bottom connects the booster pump, and the gas outlet of middle container passes through 3# air inlet valve 41 and connects the air inlet on the high temperature high pressure reaction kettle lateral wall, establishes agitating unit 45 and heating device 43 in the high temperature high pressure reaction kettle, still is equipped with air outlet valve 42 on the high temperature high pressure reaction kettle lateral wall, and high temperature high pressure reaction kettle bottom is equipped with liquid outlet valve 44.
By CO 2 The gas cylinder 1 is filled with high-pressure gas into an intermediate container 2 (high-temperature high-pressure sample preparation device), and is pressurized to 5Mpa. Drilling fluid is filled in the high-temperature high-pressure reaction kettle 4, the intermediate container 2 is communicated with the high-temperature high-pressure reaction kettle 4, and the pressure of the reaction system is increased to a preset pressure, such as 10MPa and CO, through the booster pump 3 2 In the reaction process of gas and drilling fluid, the pressure is kept constant by the booster pump 3, and CO is reacted 2 The reduction of the gas volume is equal to the compression volume of the booster pump, and the compression factor method is adopted to calculate the CO at high temperature and high pressure 2 Gas reaction amount.
2. CO 2 Reaction process of gas and drilling fluid
The experiment aims at researching the content of key ions or the variation, the temperature, the pressure, the pH and the CO in the reaction process under the condition through a high-temperature high-pressure test 2 The relation of the dissolution reaction amount is used for establishing an equation for CO 2 The dissolution reaction amount was predicted.
High pressure CO is injected into the intermediate container through the gas cylinder 2 Gas and CO is fed through booster pump 3 2 The gas is compressed to a preset pressure in the middle container 2, the upper end of the pressure reducing valve is connected with the upper end of the middle container, after the connection is completed, whether the gas loosens or not is checked, the upper end valve of the middle container is opened, the gas cylinder main valve is opened slightly, the pressure reducing valve is opened slowly, and the pressure is increased to 5MPa, and the pressure is kept for 5-10 minutes.
Sequentially closing the pressure reducing valve 11 and the outlet valve of the intermediate container; after the valve at the upper end of the intermediate container 2 is closed, the connecting bolt is lightly screwed for emptying, the connecting pipeline is removed after the right representation number of the pressure reducing valve is reset to zero, the pressure reducing valve is lightly screwed, gas between the pressure reducing valve and the gas cylinder is emptied, and the pressure reducing valve is closed. And injecting the gas and the drilling fluid in the intermediate container 2 into the high-temperature high-pressure reaction kettle. Measuring 500ml of drilling fluid by using a measuring cylinder, and pouring the drilling fluid into a high-temperature high-pressure reaction kettle; the upper end of the reaction kettle is well arranged, the bolt is sealed, a cooling water interface is well connected, a motor connecting wire is well connected, the interface at the upper end of the intermediate container is connected with the gas inlet of the reaction kettle, and the interface at the lower end of the intermediate container is connected with the interface of the displacement pump; and sequentially opening an air inlet valve of the reaction kettle and a valve at the upper end of the middle container, fully opening the valve at the upper end of the middle container after the pressure of the reaction kettle is stable in representation number, and recording data (initial pressure and initial temperature).
And starting a booster pump, setting constant pressure of 5MPa, opening a valve at the lower end of the intermediate container when the pump pressure is increased to about 5MPa, and starting to heat the reaction kettle body, wherein the device is in a boosting and heating process. Turning on the stirring device, controlling the rotation speed between 600-700 revolutions, and keeping the constant pressure of 5MPa for more than 2 hours.
Sequentially closing a displacement pump, a stirring motor and a kettle body to heat, slowly opening a high-temperature high-pressure reaction kettle air outlet valve, waiting for the pressure drop of the reaction kettle to be 0, opening a reaction kettle liquid outlet valve, receiving about 150ml of sample, collecting redundant drilling fluid, and pouring into a waste liquid pool.
3. Analysis by multiple regression
CO 2 In the reaction process of gas and drilling fluid, the pressure of an air compressor is kept constant through a booster pump, and CO in the reaction 2 The reduction of the gas volume is equal to the compression volume of the booster pump, and the compression factor method is adopted to calculate the CO at high temperature and high pressure 2 Gas reaction amount. Drawing a three-dimensional fishing net diagram (figure 2) by adopting Origin software through temperature, pressure and compression factor data, and fitting through stepwise regression to obtain the three-dimensional fishing net diagram:
Z＝0.8972-0.06348x+0.004795y+0.00216x 2 +8.041×10 -5 xy-1.58810 -6 y 2 -2.259×10 -5 x 3 -2.259×10 -6 x 2 y+3.211×10 -8 xy 2 +8.097×10 -8 x 4 +1.347×10 -8 x 3 y-2.679×10 -11 x 2 y 2 (R 2 ＝0.9915)；
wherein Z is a compression factor, x is pressure, the unit is MPa, y is temperature, and the unit is K.
By using the above equation, the temperature and pressure are substituted to obtain the compression factor Z.
CO according to temperature, pressure 2 The volume reduction, denoted as V, was calculated as CO 2 Is prepared from the following components by dissolving and reacting:
thereby calculating the test temperature and CO under the pressure 2 Solubility C in drilling fluid T ＝(n Before the reaction -n After the reaction )/V Drilling fluid
C T For CO in drilling fluids 2 Solubility; v (V) Drilling fluid In m 3 。
And (3) testing the water quality of drilling fluid: measuring drilling fluid and CO 2 pH and Na of drilling fluid before and after high-temperature high-pressure reaction + 、K + 、Ca 2+ 、Mg 2+ 、Fe 2+ 、CO 3 2- 、HCO 3 - Plasma concentration, and calculate the amount of change of the corresponding ion, experimental data are as follows:
TABLE 1CO 2 Statistical table of reaction experiment with drilling fluid
4. Rule analysis and establishment of prediction model
Based on the results of the ion concentration analysis and CO 2 The reaction amount and dissolution amount in the drilling fluid are summarized as conditions of temperature, pressure, concentration of each ion and the like for CO 2 Influence law of action with drilling fluid, and establishing CO based on ion concentration change by using multiple regression analysis method 2 Chemical reaction amount and dissolution amount prediction model of drilling fluid:
according to CO 2 Obtaining a correlation equation from the reaction data of the drilling fluid through regression analysis, and obtaining the actual meaning of regression each item and the convenience and convenience in equation use according to the correlation of the equationThe degree is broken down to obtain the following three equations:
(1) Three-parameter linear equation C T ＝0.3663*pH+6.1303*[CO 3 2- ]+3.6302*[HCO 3 - ](R 2 = 0.7896); wherein [ CO ] 3 2- ]、[HCO 3 - ]The unit is mol/L.
When the equation is used, the parameters to be tested are fewer, the test is convenient, the meaning is clear, and the engineering practice is convenient.
(2) Five parameter equations: c (C) T ＝0.0032*P+0.054*T-1.94*pH+47.96*[CO 3 2- ]+3.23*[HCO 3 - ](r2= 0.8784); wherein [ CO ] 3 2- ]、[HCO 3 - ]The unit is mol/L, the unit is thermodynamic temperature K, and the unit is test pressure MPa.
The equation has higher correlation, and takes chemical factors and physical factors of the reaction into consideration, but the temperature pressure is continuously changed in the process of flowing drilling fluid from the bottom of a well to the top of the well, and the simulation experiment process is a relatively static process. Is used under the condition that the application process is approximately unchanged in pressure and temperature.
(3) Seven parameter equation: c (C) T ＝-0.2032*P+0.0896*T-2.4976*pH+77.9870*[CO 3 2- ]+9.5727*[HCO 3 - ]+0.0003*△[Ca 2+ ]+0.0112*△[Mg 2+ ](R 2 = 0.9126); wherein [ CO ] 3 2- ]、[HCO 3 - ]The unit is mol/L, the unit is thermodynamic temperature K, the unit is test pressure MPa, and the unit is delta Ca 2+ ]、△[Mg 2+ ]Is Ca 2+ 、Mg 2+ The difference between the outlet concentration and the inlet concentration is in mg/L.
The equation is complex, the parameters to be tested are more, but the correlation is highest.
5. Application of prediction method-prediction of CO in drilling fluid 2 Solubility of
Testing actual production well and actual measurement of CO 2 And comparing and verifying the equation fitting data.
The prediction deviation of the carbon dioxide prediction equation is small in general, but the prediction deviation of the multi-parameter equation is small in comparison with the less parameter equation through the actual production data, and the exception is caused because the prediction equation is obtained under relatively limited conditions and test times, and the predicted independent variable is selected in a limited range. Thus, the prediction of the model needs to be discussed under the allowable deviation to make sense. The prediction result deviation can be controlled within 30% by using 7 parameter equation or adopting a method of averaging the prediction results of multi-parameter equation, so that the prediction result deviation is controllable and the application is convenient.
In actual operation, the [ CO ] is measured according to actual conditions 3 2- ]、[HCO 3 - ]、T、P、[Ca 2+ ]、[Mg 2+ ]And (5) carrying out prediction by adopting a regression equation. Under the condition of condition permission, seven parameter equations are preferably selected, or the prediction results of the several equations are averaged, and the prediction results of the several methods are averaged, so that the tuning of the overall calculation result is realized. Several regression equations (three-parameter equation, five-parameter equation and seven-parameter equation) are adopted for prediction, and meanwhile, the mutual verification function is achieved.
In actual operation, due to the difference of working conditions of different blocks, the differences of drilling fluid composition, working pressure temperature, rock stratum structure and the like, the equation form disclosed by the invention is adopted for CO 2 Content (volume percent or molar concentration) of [ CO ] 3 2- ]、[HCO 3 - ]、T、P、[Ca 2+ ]、[Mg 2+ ]The correction of the regression equation is carried out by the equal parameters, so that the correction is more suitable for specific work, and the patent is also the right content which should be protected.
Claims (3)
1. CO in drilling fluid of high-temperature high-pressure stratum system 2 The content prediction method is characterized by comprising the following steps: the method comprises the following steps:
(1) Building CO 2 A gas and drilling fluid reaction device: by CO 2 The connection of the gas steel bottle, the intermediate container, the booster pump, the air compressor and the high-temperature high-pressure reaction kettle is used for building CO 2 A gas and drilling fluid reaction device; wherein CO 2 The connection relation between the gas and the drilling fluid reaction device is as follows: CO 2 The gas outlet of the gas steel bottle is connected with the gas inlet of the intermediate container, the valve at the bottom of the intermediate container is connected with the booster pump, the gas outlet of the intermediate container is connected with the gas inlet on the side wall of the high-temperature high-pressure reaction kettle through the gas inlet valve, the stirring device and the heating device are arranged in the high-temperature high-pressure reaction kettle, the gas outlet is also arranged on the side wall of the high-temperature high-pressure reaction kettle, the gas outlet is connected with the gas outlet valve, the bottom of the high-temperature high-pressure reaction kettle is provided with the liquid outlet, and the liquid outlet is connected with the liquid outlet valve;
(2)CO 2 the reaction process of the gas and the drilling fluid comprises the following steps: the pressure is kept constant by a booster pump, and CO in the reaction 2 The reduction of the gas volume is equal to the compression volume of the booster pump, and the compression factor method is adopted to calculate the CO at high temperature and high pressure 2 Gas reaction amount;
(3) Determination of drilling fluid and CO 2 Ion concentration changes before and after the reaction;
(4) Calculation of CO in drilling fluid Using multiple regression analysis 2 Solubility, study of reaction factors and CO 2 Correlation between solubility, get multiple regression equation, the said reaction factor includes ion concentration change, pH value, temperature, pressure; wherein, CO in drilling fluid 2 The solubility calculation equation is:
C T ＝(n before the reaction -n After the reaction )/V Drilling fluid
C T For CO in drilling fluids 2 Solubility; v (V) Drilling fluid In m 3 ；
n is CO 2 The amount of the substance is such that,
wherein P is pressure, unit Mpa; t is temperature, and the unit is K; v is the volume, the unit is m 3 The method comprises the steps of carrying out a first treatment on the surface of the Z is a compression factor, Z= 0.8972-0.063248x+0.004795y+0.00216 x 2 +8.041×10 -5 xy-1.58810 -6 y 2 -2.259×10 -5 x 3 -2.259×10 -6 x 2 y+3.211×10 -8 xy 2 +8.097×10 -8 x 4 +1.347×10 -8 x 3 y-2.679×10 -11 x 2 y 2 (R 2 ＝0.9915)，
Wherein: x is pressure, unit is MPa, y is temperature, unit is K;
the multiple regression equation is as follows:
three parameter equations: c (C) T ＝0.3663*pH+6.1303*[CO 3 2- ]+3.6302*[HCO 3 - ]，R 2 ＝0.7896；
Five parameter equations: c (C) T ＝0.0032*P+0.054*T-1.94*pH+47.96*[CO 3 2- ]+3.23*[HCO 3 - ]，R 2 = 0.8784; or (b)
Seven parameter equation: c (C) T ＝-0.2032*P+0.0896*T-2.4976*pH+77.9870*[CO 3 2- ]+9.5727*[HCO 3 - ]+0.0003*△[Ca 2+ ]+0.0112*△[Mg 2+ ]，R 2 ＝0.9126；
Wherein [ CO ] 3 2- ]、[HCO 3 - ]CO respectively 3 2- 、HCO 3 - The unit is mol/L; delta [ Ca ] 2+ ]、△[Mg 2+ ]Respectively Ca 2+ 、Mg 2+ The difference between the outlet concentration and the inlet concentration in mg/L;
(5) Substituting the reaction factors into the multiple regression equation obtained in the step (4) to predict the CO in the drilling fluid 2 Solubility of the polymer.
2. The CO in a drilling fluid for a high temperature and high pressure formation system of claim 1 2 The content prediction method is characterized in that the specific process in the step (2) is as follows: opening a booster pump, setting constant pressure to 5MPa, opening an air inlet valve of the high-temperature high-pressure reaction kettle communicated with an air outlet of the intermediate container when the pressure of the booster pump is increased to 5MPa, and heating the high-temperature high-pressure reaction kettle, wherein the high-temperature high-pressure reaction kettle is in supercharging and heatingStarting a stirring device arranged in the high-temperature high-pressure reaction kettle, controlling the rotating speed to be 600-700 revolutions per minute, and keeping the constant pressure of 5MPa for more than 2 hours; and then sequentially closing the booster pump and the stirring device, stopping heating the high-temperature high-pressure reaction kettle, slowly opening the gas outlet valve of the reaction kettle, opening the liquid outlet valve of the reaction kettle when the pressure of the reaction kettle is reduced to 0, taking a test sample, collecting redundant drilling fluid, and pouring the redundant drilling fluid into a waste liquid pool.
3. The CO in a drilling fluid for a high temperature and high pressure formation system of claim 1 2 The content prediction method is characterized in that in the step (4), a plurality of multiple regression equations are adopted for calculation so as to mutually prove.
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