CN108005649B - Method for distinguishing formation fluid properties by gas measurement efficiency value - Google Patents
Method for distinguishing formation fluid properties by gas measurement efficiency value Download PDFInfo
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- CN108005649B CN108005649B CN201711348811.0A CN201711348811A CN108005649B CN 108005649 B CN108005649 B CN 108005649B CN 201711348811 A CN201711348811 A CN 201711348811A CN 108005649 B CN108005649 B CN 108005649B
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- 238000005259 measurement Methods 0.000 title claims abstract description 105
- 239000012530 fluid Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000015572 biosynthetic process Effects 0.000 title abstract description 9
- 238000004364 calculation method Methods 0.000 claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 description 97
- 238000005553 drilling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007621 cluster analysis Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012850 discrimination method Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/0875—Well testing, e.g. testing for reservoir productivity or formation parameters determining specific fluid parameters
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a method for judging the property of formation fluid by using gas measurement efficiency value, which comprises the following steps: a. establishing a gas measurement efficiency value calculation method according to a gas release mode of a gas measurement display section; b. calculating the gas measurement efficiency value of a gas measurement display section in a drilled oil testing section in the area according to a gas measurement efficiency value calculation method, and preferably selecting a fluid judgment value according to the difference of oil testing results; c. and forming a gas measurement efficiency value fluid interpretation model of the region by combining a gas measurement efficiency value calculation formula and a fluid judgment value. The method introduces a new parameter gas measurement efficiency value and a calculation method thereof, expands the means of logging interpretation, and simultaneously takes the gas measurement efficiency value of the gas measurement display section as a parameter for fluid judgment, thereby not only more fully reflecting the gas measurement characteristics of gas measurement display, but also overcoming the limitation existing when the gas measurement peak value is taken as the gas measurement display characteristics.
Description
Technical Field
The invention relates to a method for judging the property of formation fluid by using a gas measurement efficiency value, belonging to the technical field of petroleum and natural gas exploration and development.
Background
The gas logging parameters are important parameters for well logging interpretation, particularly for fluid interpretation, the gas logging parameters are basically used, and the gas logging parameters are mainly distinguished by a chart or other methods according to the proportion difference of all hydrocarbons and components in gas logging data. However, as the drilling process and the performance of the drilling fluid are increasingly complicated, the response accuracy of gas logging parameters to the properties of the formation fluid is reduced, the method effect is deteriorated, and the following problems mainly exist:
1. the current gas measurement parameter-based fluid interpretation method mainly finds an effective fluid discrimination mode through cluster analysis of regional gas measurement data. However, under complex drilling process conditions, the clustering effect becomes poor, and a discrimination mode cannot be established.
2. The gas-logging parameter-based fluid interpretation methods all use depth-domain gas-logging data, which are depth-corresponding gas-logging maxima, wherein the time-domain effects are neglected.
3. The gas measurement parameters are seriously influenced by engineering parameters, but the current fluid interpretation method uses gas measurement data which is not corrected by the engineering parameters, and has limitation.
4. The current fluid interpretation method applies single-point data, namely gas measurement data of a certain depth point, and does not consider information contained in the change of the gas measurement data in the depth.
Disclosure of Invention
The invention aims to provide a method for distinguishing the formation fluid property by using a gas measurement efficiency value aiming at the defects and the defects of the prior art, introduces a new parameter gas measurement efficiency value and a calculation method thereof, expands the means of logging interpretation, and simultaneously takes the gas measurement efficiency value of a gas measurement display section as a parameter for distinguishing the fluid, thereby more fully embodying the gas measurement characteristics of gas measurement display and overcoming the limitation of taking a gas measurement peak value as the gas measurement display characteristics.
The invention is realized by adopting the following technical scheme:
a method for distinguishing the stratum fluid property by using gas measurement efficiency value is characterized by comprising the following steps:
a. establishing a gas measurement efficiency value calculation method according to a gas release mode of a gas measurement display section;
b. calculating the gas measurement efficiency value of a gas measurement display section in a drilled oil testing section in the area according to a gas measurement efficiency value calculation method, and preferably selecting a fluid judgment value according to the difference of oil testing results;
c. and forming a gas measurement efficiency value fluid interpretation model of the region by combining a gas measurement efficiency value calculation formula and a fluid judgment value.
In the step a, according to the gas release mode of the gas measurement display section, a calculation method for establishing a gas measurement efficiency value is as follows: the gas measurement reflects the amount of gas released from the formation, is recorded on a time axis, and is influenced by the gas measurement baseline. According to the gas release and collection mode of the gas measurement display section, the calculation formula for deducing the gas release rate (gas measurement efficiency) is as follows:
in the step b, according to the difference of the oil testing results, the preferable fluid discrimination values are as follows: and calculating the gas measurement efficiency value of the gas measurement display section in the drilled oil testing section in the area by using a gas measurement efficiency value calculation method, classifying the gas measurement efficiency value of the gas measurement display section according to the oil testing result of each oil testing section, and preferably selecting a fluid judgment value with the maximum coincidence rate as a target.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention truly reflects the hydrocarbon gas overflow rate (gas measurement efficiency) of the gas measurement display section by establishing a gas measurement efficiency value calculation method. And establishing a stratum fluid discrimination method according to the difference of gas measurement efficiency of gas measurement display sections in the stratum with different fluid properties, wherein a new parameter gas measurement efficiency value (gas overflow rate) and a calculation method thereof are introduced, and a logging interpretation means is expanded.
2. The invention takes the gas measurement efficiency value of the gas measurement display section as the parameter for fluid discrimination, not only fully embodies the gas measurement characteristics of gas measurement display, but also overcomes the limitation of taking the gas measurement peak value as the gas measurement display characteristics.
3. The invention applies two engineering parameters of drilling fluid discharge and drilling time to improve the accuracy of gas measurement efficiency value calculation, and is obviously better than the prior gas measurement interpretation method.
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 preferred graph of the gas measurement efficiency value interpretation fluid determination value of GM region of the present invention.
Detailed Description
Referring to the attached drawings of the specification, the best mode of the invention discloses a method for judging the property of formation fluid by using gas measurement efficiency value, which comprises the following steps:
a. establishing a gas measurement efficiency value calculation method according to a gas release mode of a gas measurement display section;
b. and calculating the gas measurement efficiency value of the gas measurement display section in the drilled oil testing section in the area according to the gas measurement efficiency value calculation method, and preferably selecting the fluid judgment value according to the difference of the oil testing results.
c. And forming a gas measurement efficiency value fluid interpretation model of the region by combining a gas measurement efficiency value calculation formula and a fluid judgment value.
In the step a, according to the gas release mode of the gas measurement display section, a calculation method for establishing a gas measurement efficiency value is as follows: the gas measurement reflects the amount of gas released from the formation, is recorded on a time axis, and is influenced by the gas measurement baseline. According to the gas release and collection mode of the gas measurement display section, the calculation formula for deducing the gas release rate (gas measurement efficiency) is
However, conventional gas survey data is recorded with depth as the axis, so equation 2 is transformed into an integral in the depth domain.
In the step b, according to the difference of the oil testing results, the preferable fluid discrimination values are as follows: and calculating the gas measurement efficiency value of the gas measurement display section in the drilled oil testing section in the area by using a gas measurement efficiency value calculation method. And classifying the gas measurement efficiency values of the gas measurement display sections according to the oil measurement results of the oil measurement sections, and preferably selecting the fluid discrimination value with the maximum coincidence rate.
According to the method, a gas measurement efficiency value calculation method is established according to the gas release and acquisition mode of the gas measurement display section, and the gas overflow rate of the gas measurement display section is truly reflected. And preferably selecting the fluid discrimination value according to the difference of the gas measurement efficiency values of the gas measurement display sections in the stratum with different fluid properties. And obtaining a regional gas measurement efficiency value fluid interpretation model by combining a gas measurement efficiency value calculation method and a fluid discrimination value.
Claims (1)
1. A method for distinguishing the stratum fluid property by using gas measurement efficiency value is characterized by comprising the following steps:
a. establishing a gas measurement efficiency value calculation method according to a gas release mode of a gas measurement display section;
b. calculating the gas measurement efficiency value of a gas measurement display section in a drilled oil testing section in the area according to a gas measurement efficiency value calculation method, and preferably selecting a fluid judgment value according to the difference of oil testing results;
c. forming a gas measurement efficiency value fluid interpretation model of the region by combining a gas measurement efficiency value calculation formula and a fluid discrimination value;
in the step a, according to the gas release mode of the gas measurement display section, a calculation method for establishing a gas measurement efficiency value is as follows: according to the gas release and collection mode of the gas measurement display section, the calculation formula for deducing the gas release rate is as follows:
transform equation 2 into the integral of the depth domain:
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| CN109403960B (en) * | 2018-09-06 | 2022-03-29 | 中国石油集团川庆钻探工程有限公司 | Method for judging reservoir fluid properties by logging gas peak-logging state |
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