CN114036782B - Method for calculating true value and background value of well gas logging - Google Patents
Method for calculating true value and background value of well gas logging Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005259 measurement Methods 0.000 claims abstract description 46
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 40
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 40
- 238000005553 drilling Methods 0.000 claims abstract description 38
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 37
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 16
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 10
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 7
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 4
- 239000001273 butane Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 4
- 239000001294 propane Substances 0.000 claims description 4
- 230000017105 transposition Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 2
- 230000005251 gamma ray Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 110
- 238000011161 development Methods 0.000 abstract description 2
- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract description 2
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- 238000010586 diagram Methods 0.000 description 2
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- 230000004043 responsiveness Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Abstract
The invention discloses a method for calculating a true value and a background value of a drilling gas survey, and belongs to the technical field of petroleum and natural gas exploration and development. The method comprises the steps of representing a gas measurement total hydrocarbon display value in a drilling process by using a superposition relation of a real value and a background value, establishing a correlation formula with gas measurement values of all components, carrying out mathematical calculation on the formula by using gas measurement data corresponding to different well depths, and obtaining a fitting value of each coefficient so as to obtain the real value and the background value of the gas measurement total hydrocarbon respectively. According to the method, the gas measurement true value and the background value can be corrected and calculated, the problem that the gas measurement background value is not easy to determine is solved while the full hydrocarbon gas measurement true value is determined, the interference of the gas measurement background value is eliminated, the oil-gas containing condition of the stratum is objectively reflected, and the accurate response of the gas measurement value to the oil-gas content of the stratum is improved.
Description
Technical Field
The invention relates to a method for calculating a true value and a background value of a drilling gas survey, belonging to the technical field of petroleum and natural gas exploration and development.
Background
In the process of petroleum drilling, when an oil-gas layer is opened, oil gas enters drilling fluid through permeation and diffusion effects, then the drilling fluid is carried to the ground for detection, the content of all hydrocarbon and each component gas is detected by using gas analysis equipment, the oil-gas-containing information of a stratum can be reflected, the oil-gas-containing information is used for discovering and evaluating underground oil gas display, the detected component gas generally comprises methane C1Ethane C2Propane C3Butane C4Pentane C5. However, the relationship between the total hydrocarbon number and the components has not been agreed upon. From the isocarbon response, the total hydrocarbon value TG is approximately in accordance with the following equation:
TG=C1+2C2+3C3+4C4+5C5
however, in practical application, it is found through a gas measurement data table that after the above addition correction, each component value sometimes has a large error with the measured total hydrocarbon value. The total hydrocarbon number is not simply the algebraic sum of the volume fraction values of the individual components and should be given by a certain factor.
The actual full hydrocarbon gas measurement value in the drilling process is a combination of multiple gases and can be basically divided into two parts: one is the bit-broken gas, which is the true value of gas logging in the drilling process, i.e. the gas logging reflecting the oil-gas condition of the formation; another type is background values that need to be removed from the field survey values. The measured gas value measured on site is substantially the result of the superposition of the real gas value and the background value. Under the interference of the gas measurement background value, the gas measurement value measured in the drilling site can not objectively reflect the oil-gas containing condition of the stratum and should be removed.
The gas measurement background value is a combination of a plurality of gases and basically comprises the following three parts: firstly, gas in the circulating drilling fluid returns to the ground, and after passing through a purification and solid control circulating system, the gas in the drilling fluid does not completely escape and reenters a shaft to be mixed with broken gas of a drill bit to form background gas of a gas measurement value, and the value is influenced by factors such as the performance of the drilling fluid, drilling fluid solid control equipment and the like; secondly, a large amount of hydrocarbon source rocks exist in the stratum at the upper part of the drilled well hole, or the drilled reservoir stratum exists, and because the shaft of the drilled reservoir stratum has a plurality of pressure systems, the stratum gas enters the shaft under the action of differential pressure; and thirdly, the drilling fluid additive is cracked under the action of high temperature and high pressure at the bottom of the well, a certain amount of hydrocarbon gas can be generated, and if more organic treating agents are added, a higher background value can be generated.
The above three parts all have the possibility of generating background gas which has no obvious difference in composition from the drill bit crushing gas. Therefore, the subtraction of the background value of the gasometry is very difficult. For the processing of the gas measurement background value, a method for roughly processing gas measurement data by using a base value deduction method is proposed, but for most wells, the influence of the background value is complex and difficult to determine, and the difficulty of using the base value deduction method is high.
Disclosure of Invention
The invention aims to provide a method for calculating the true value and the background value of the gas logging of the well, aiming at overcoming the defects and shortcomings of the prior art, the method can be used for calculating the true value and the background value of the gas logging, solving the difficulty that the background value of the gas logging is difficult to determine, eliminating the interference of the background value of the gas logging, objectively reflecting the oil-gas content of the stratum and improving the accurate responsiveness of the gas logging value to the oil-gas content of the stratum.
The invention is realized by adopting the following technical scheme:
a method for calculating a true value and a background value of a gas logging in a well is characterized by comprising the following steps:
1. the gas measured total hydrocarbon display TG during drilling is expressed by the following equation:
TG=TGtrue value+TGBackground value
Wherein, TGTrue valueThe correlation formula with each component is as follows:
TGtrue value=a1 C1+a2C2+a3C3+a4C4+a5C5
TGBackground valueThe expression is as follows: TG (glass transition temperature) deviceBackground value=a0Representing a gas measurement background value under the current well depth;
establishing a correlation formula of the gas logging total hydrocarbon display value in the drilling process, the gas logging values of all components and the gas logging background value:
TG=a0+a1 C1+a2C2+a3C3+a4C4+a5C5 formula 1
Wherein TG represents a gas-measured total hydrocarbon display value at a certain well depth during drilling, C1-C5The gas values of the components methane, ethane, propane, butane and pentane at the corresponding depths are shown as a1-a5Represents each component C1-C5A weighting coefficient of0Is a gas background value;
2. gas logging data tables corresponding to n well depth data are obtained by detecting gas logging of all hydrocarbons and all components in the well drilling process and are respectively recorded as
TG=[TG1,TG2,…TGn]T
C1=[C1-1,C1-2,..C1-n]T
C2=[C2-1,C2-2,..C2-n]T
C3=[C3-1,C3-2,..C3-n]T
C4=[C4-1,C4-2,..C4-n]T
C5=[C5-1,C5-2,..C5-n]T
In the formula [. C.]TIndicating transposition, 1, 2 … n in the subscripts represent different well depth data, TG1,… TGn represents the gas-measured total hydrocarbon values, C, corresponding to well depth data 1, 2 … n, respectively1=[C1-1,C1-2,..C1-n]TRespectively represent methane C corresponding to well depth data 1 and 2 … n1Gas measuring value, and the rest components are analogized in the same way; formula 1 can be arranged as:
3. The gas measurement value corresponding to each well depth is taken into 2, and the fitted a is solved through mathematical software0-a5Specific value of (a) to be solved for0-a5The value of (a) is taken into the gas measurement value of each component in the gas measurement data table, and a is obtained1C1-i+a2C2-i+a3C3-i+a4C4-i+a5C5-iNamely the true value of the gas-logging total hydrocarbon under the well depth data i (1, 2 … n), a0The gas logging background value is obtained, and thus the real value and the background value of the gas logging whole hydrocarbon of the well drilling are obtained respectively.
The method divides a gas logging data table of well depth data obtained in the drilling process into a plurality of sections to respectively obtain gas logging true values and background values of different well sections, and when the gas logging display is influenced by the change of field working conditions (assuming that the well depth data is m at the moment), the well depth data corresponding to the gas logging value used in the calculation of the section is m, namely the well depth data are respectively calculated under different working conditions, so that the accuracy and the adaptability of a calculation model are enhanced.
The invention has the following beneficial effects:
the invention establishes the mathematical relationship between the gas measurement total hydrocarbon value and the gas measurement value and the background value of each component, and can separate and obtain the gas measurement true value and the background value by actually measuring the gas measurement data on site, without detection equipment, the operation is convenient and accurate, the difficulty that the gas measurement background value is not easy to determine is solved, and the interference of the gas measurement background value is eliminated.
The invention can respectively calculate the gas measurement true value and the background value of different well sections according to the change of the field condition in the drilling process, and has strong applicability.
The invention can not only correct the gas measurement value recorded in real time, but also correct the data recorded in early stage.
Drawings
The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:
FIG. 1 is a calculation model diagram of the true value and the background value of the total hydrocarbon gas logging in a certain well section in the drilling process of a certain well.
Detailed Description
As the best mode of execution of the invention, the invention discloses a method for calculating the true value and the background value of the whole hydrocarbon of the well gas logging, which comprises the following steps:
1. the gas measured total hydrocarbon display TG during drilling is expressed by the following equation:
TG=TGtrue value+TGBackground value
Wherein, TGTrue valueThe correlation formula with each component is as follows:
TGtrue value=a1 C1+a2C2+a3C3+a4C4+a5C5
TGBackground valueThe expression is as follows: TG (gamma-ray) in a single phaseBackground value=a0Representing a gas measurement background value under the current well depth;
establishing a correlation formula between the gas measurement total hydrocarbon display value and the gas measurement value of each component in the drilling process:
TG=a0+a1 C1+a2C2+a3C3+a4C4+a5C5 formula 1
Wherein TG represents a gas-measured total hydrocarbon display value at a certain well depth during drilling, C1-C5The gas values of the components methane, ethane, propane, butane and pentane at the corresponding depths are shown as a1-a5Represents each component C1-C5A weighting coefficient of0A gas measurement background value;
2. gas logging data tables corresponding to n well depth data are obtained by detecting gas logging of all hydrocarbons and all components in the well drilling process and are respectively recorded as
TG=[TG1,TG2,…TGn]T
C1=[C1-1,C1-2,..C1-n]T
C2=[C2-1,C2-2,..C2-n]T
C3=[C3-1,C3-2,..C3-n]T
C4=[C4-1,C4-2,..C4-n]T
C5=[C5-1,C5-2,..C5-n]T
Wherein, the design is as follows.]TIndicating transposition, 1, 2 … n in the subscripts represent different well depth data, TG1,… TGn represents the gas-measured total hydrocarbon values, C, corresponding to well depth data 1, 2 … n, respectively1=[C1-1,C1-2,..C1-n]TRespectively represent methane C corresponding to well depth data 1 and 2 … n1Gas measuring value, and the rest components are analogized in the same way; formula 1 can be arranged as:
3. The gas measurement value corresponding to each well depth is brought into 2, and the data is obtained through mathematicsSoftware solves the fitted a0-a5Specific value of (a) to be solved for0-a5The value of (a) is taken into the gas measurement value of each component in the gas measurement data table, and a is obtained1C1-i+a2C2-i+a3C3-i+a4C4-i+a5C5-iNamely the true value of the gas-logging total hydrocarbon under the well depth data i (1, 2 … n), a0The gas logging background value is obtained, and thus the real value and the background value of the gas logging whole hydrocarbon of the well drilling are obtained respectively.
The method can divide the gas logging data table of all well depth data in the drilling process into a plurality of sections to respectively obtain gas logging actual values and background values of different well sections, and when field working conditions change, for example, drilling oil gas layers, additives are mixed in drilling fluid and the like (assuming that the well depth data is m at the moment) influence gas logging display, the well depth data corresponding to the gas logging values used in the calculation of the section is m, namely, the calculation is respectively carried out under different working conditions, so that the accuracy and the adaptability of a calculation model are enhanced.
FIG. 1 is a calculation model diagram of the true value and the background value of the total hydrocarbon gas logging in a certain well section in the drilling process of a certain well. The model is based on calculation software to obtain a0-a5And respectively calculating the fitting values to obtain a true value and a background value of the gas measurement total hydrocarbon, and comparing the fitting values with the actual value of the total hydrocarbon to reflect the influence of the background value on the gas measurement.
Therefore, according to the invention, the field actual measurement total hydrocarbon value can be converted into the real total hydrocarbon value and the background value, and the values of the two parts are respectively obtained, so that the difficulty that the gas measurement background value is difficult to determine is solved, the interference of the gas measurement background value is eliminated, the oil-gas containing condition of the stratum is objectively reflected, and the accurate responsiveness of the gas measurement value to the oil-gas content of the stratum is improved.
Claims (2)
1. A method for calculating a true value and a background value of a gas logging in a well is characterized by comprising the following steps:
a. the gas logging whole hydrocarbon display TG during drilling is expressed by the following equation:
TG=TGtrue value+TGBackground value
Wherein, TGTrue valueThe correlation formula with each component is as follows:
TGtrue value=a1 C1+a2C2+a3C3+a4C4+a5C5
TGBackground valueThe expression is as follows: TG (gamma-ray) in a single phaseBackground value=a0Representing a gas measurement background value under the current well depth;
establishing a correlation formula of the gas logging total hydrocarbon display value in the drilling process, the gas logging values of all components and the gas logging background value:
TG=a0+a1 C1+a2C2+a3C3+a4C4+a5C5 formula 1
Wherein TG represents a gas-measured total hydrocarbon display value at a certain well depth during drilling, C1-C5The gas values of the components methane, ethane, propane, butane and pentane at the corresponding depths are shown as a1-a5Represents each component C1-C5A weighting coefficient of0Is a gas background value;
b. gas logging data tables corresponding to n well depth data are obtained by detecting gas logging of all hydrocarbons and all components in the well drilling process and are respectively recorded as
TG=[TG1,TG2,…TGn]T
C1=[C1-1,C1-2,..C1-n]T
C2=[C2-1,C2-2,..C2-n]T
C3=[C3-1,C3-2,..C3-n]T
C4=[C4-1,C4-2,..C4-n]T
C5=[C5-1,C5-2,..C5-n]T
Wherein, the design is as follows.]TIndicating transposition, 1, 2 … n in the subscripts representing differencesWell depth data, TG1,… TGn represents the gas-measured total hydrocarbon values, C, corresponding to well depth data 1, 2 … n, respectively1=[C1-1,C1-2,..C1-n]TRespectively represent methane C corresponding to well depth data 1 and 2 … n1Measuring gas value, and repeating the steps for the rest components; formula 1 can be arranged as:
c. The gas measurement value corresponding to each well depth is taken into 2, and the fitted a is solved through mathematical software0-a5Specific value of (a) to be solved for0-a5The value of (a) is taken into the gas measurement value of each component in the gas measurement data table, and a is obtained1C1-i+a2C2-i+a3C3-i+a4C4-i+a5C5-iNamely the true value of the gas-logging total hydrocarbon under the well depth data i (1, 2 … n), a0The gas logging background value is obtained, and thus the real value and the background value of the gas logging whole hydrocarbon of the well drilling are obtained respectively.
2. The method for calculating the true value and the background value of the gas logging in the well drilling according to claim 1, wherein the method divides a gas logging data table of the well depth data obtained in the well drilling process into a plurality of sections to respectively obtain the true value and the background value of the gas logging in different well sections, and when the gas logging display is influenced by the change of the field working conditions, namely the well depth data m at the moment is assumed, the well depth data corresponding to the gas logging value used in the calculation in the section is m.
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Inventor after: Shi Xiaofeng Inventor before: Shi Xiaofeng Inventor before: Zhou Jianli |
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| CB03 | Change of inventor or designer information |