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CN104265279A - Logging-while-drilling curve prediction method under fault condition - Google Patents

Logging-while-drilling curve prediction method under fault condition Download PDF

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Publication number
CN104265279A
CN104265279A CN201410367695.7A CN201410367695A CN104265279A CN 104265279 A CN104265279 A CN 104265279A CN 201410367695 A CN201410367695 A CN 201410367695A CN 104265279 A CN104265279 A CN 104265279A
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Prior art keywords
well
curve
logging
prediction
track
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CN201410367695.7A
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CN104265279B (en
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胡振平
姜艳玲
吉人
吴胜
吴宝玉
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CNPC Chuanqing Drilling Engineering Co Ltd
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CNPC Chuanqing Drilling Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B47/00Survey of boreholes or wells
    • E21B47/02Determining slope or direction
    • E21B47/022Determining slope or direction of the borehole, e.g. using geomagnetism
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00Testing 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

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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 (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The invention discloses a logging while drilling curve prediction method under fault conditions, which comprises the following steps: and on the basis of reference well information beside a logging-while-drilling operation well, combining a track along with drilling and a stratum model, calculating a logging prediction curve along a well track, comparing the logging prediction curve with an actual drilling curve, judging whether the established stratum model is correct or not, and correcting the stratum model. The invention not only can utilize the small layer comparison result of the reference well, but also can accurately express various faults, and can predict the curve along the well track under the control of the fault and the stratum position, thereby improving the accuracy of the predicted curve.

Description

Well logging during curve prediction method under tomography condition
Technical field
The present invention relates to a kind of well logging during curve prediction method under tomography condition, belong to drilling prospection development technique field.
Background technology
In the exploration and development of Sichuan Basin stone carbon system reservoir, often can bore and run into high-dip structure and tomography.The method supposition carrying out at present curve prediction in well logging during do not have tomography or tomography vertical carry out, such as, 06 phase in 2010 " oil drilling technology " disclosed a kind of log Forecasting Methodology based on SVMs, set up SVM prediction model by offset well to predict current borehole logging tool curve, introduce Measurement While Drilling Data simultaneously and carry out upgrading with brill to the log of current Jing Zuantouchu.
And tomography often exists and is not vertical under conditions down-hole, the curve prediction carried out under assumed conditions obviously can not meet on-the-spot actual needs, and prior art mainly exists following shortcoming: 1. stratigraphic horizon line does not have geological Significance; 2. adopt line of demarcation to manage fault block, line of demarcation does not have geological Significance; 3. the layer bit line between fault block does not set up correlation, and when operating the layer position of a fault block, other fault block can not synchronously change; 4. curve prediction can not be carried out to when there is reverse fault.
Summary of the invention
The object of the invention is to overcome the problems referred to above that prior art exists, a kind of well logging during curve prediction method under tomography condition is provided.The present invention not only can utilize the detail correlation of reservoir bed result with reference to well, and can carry out accurate expression to all kinds of tomography, carries out the curve prediction along well track, improve the precision of prediction curve under the control of tomography and stratigraphic horizon.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of well logging during curve prediction method under tomography condition, it is characterized in that: based on the reference well information that well logging during well in operation is other, in conjunction with the track of drilling well and stratigraphic model, calculate the logging prediction curve along well track, logging prediction curve is bored curve comparison with real, judge that whether the stratigraphic model set up is correct, formation model is revised.
Described method specifically comprises the steps:
A, to reference to well interval of interest, determine the layer position (degree of depth) of representative curve;
B, in the layer position of the representative curve determined, calculate well track, calculate the vertical depth of indicatrix value and substratum;
C, by step b result of calculation import stratigraphic model, set up the relation of well track and stratigraphic model, adopt chained list manage stratigraphic model, each fault block has a tomography and multiple bed boundary;
D, according to the stratigraphic model relation set up, judge the fault block residing for point on well track, then judge this layer position residing for point successively;
At the bottom of point in e, respectively calculation procedure d to layer top and layer, the vertical distance of two line segments, represents with L1 and L2 respectively;
F, calculating well track current point correspond to reference to well vertical depth TVD;
G, then find the value of indicatrix according to the size of TVD;
H, prediction is carried out to each point of well track obtain a continuous print logging prediction curve;
I, logging prediction curve is bored curve comparison with real, judge that whether the stratigraphic model set up is correct, formation model is revised.
In described step a, select the meticulous division of well logging Qu Jinhang that cross directional variations is stable, take natural gamma (GR), resistivity (RT) curve as calibration curve, determine the layer position of representative curve.
In described step b, input well oblique angle (DEV) and direction of deflection (DAZ), application curvature method calculates well track, and calculating with vertical depth is the indicatrix value of index and the vertical depth of substratum.
In described step f, if the corresponding vertical depth with reference to well in layer top is TVD1, at the bottom of layer, the corresponding vertical depth with reference to well is TVD2, then well track current point corresponding to the design formulas with reference to well vertical depth is:
In described step g, the value design formulas of indicatrix is:
In above formula, V is the curve values of corresponding TVD, T1 be before any vertical depth, T2 be after any vertical depth, V1 be before any curve values, V2 be after any curve values.
Employing the invention has the advantages that:
One, there is the prediction curve along well track in situation in energy calculation of complex tomography of the present invention, by with real comparative analysis of boring curve, can differentiate that whether correctly stratigraphic model, and guides the correction of stratigraphic model, thus improve the reservoir Drilling ratio of geologic steering drilling, improve drilling benefit.
Two, the present invention is because adopt the stratum detail correlation of reservoir bed, can mark off stratum variations in detail longitudinally and laterally subtly; Adopt visual Modifying model, make the correction of stratigraphic model become directly perceived and quick; Employ fault block management, make prediction curve become possibility in case there being reverse fault to deposit; Employ the layer position administrative skill with STRATIGRAPHIC SIGNIFICANCE, make curve prediction be convenient to realize.
Accompanying drawing explanation
Fig. 1 judges that for the present invention the fault block residing for point on well track judges the layer position schematic diagram residing for this point more successively.
Detailed description of the invention
Technical problem to be solved by this invention: one is solve with reference to well stratum detail stratigraphic division problem; Two is relations of well track and stratigraphic model; Three is well logging during curve prediction problems under tomography condition; Four is solve problem computational methods realized by computer language.Below be specifically described.
A kind of well logging during curve prediction method under tomography condition, comprise: based on the reference well information that well logging during well in operation is other, in conjunction with the track of drilling well and stratigraphic model, calculate the logging prediction curve along well track, logging prediction curve is bored curve comparison with real, judge that whether the stratigraphic model set up is correct, formation model is revised.
Described method specifically comprises the steps:
A, to carefully analyze with reference to well interval of interest, select the meticulous division of well logging Qu Jinhang that cross directional variations is more stable, take natural gamma (GR), resistivity (RT) curve as calibration curve, determine the layer position (degree of depth) of representative curve; Meticulous division can adopt prior art.
B, in the layer position of the representative curve determined, input well oblique angle (DEV) and direction of deflection (DAZ), application curvature method calculate well track, calculating with vertical depth is the indicatrix value of index and the vertical depth of substratum.
C, by step b result of calculation import stratigraphic model, set up the relation of well track and stratigraphic model, adopt chained list manage stratigraphic model, each fault block has a tomography and multiple bed boundary.
D, according to tomography, the stratigraphic model relation set up, first judge the fault block residing for point on well track, then judge this layer position residing for point successively, as shown in Figure 1.
At the bottom of point in e, respectively calculation procedure d to layer top and layer, the vertical distance of two line segments, represents with L1 and L2 respectively.
F, set the corresponding vertical depth with reference to well in layer top as TVD1, at the bottom of layer, the corresponding vertical depth with reference to well is TVD2, then well track current point corresponds to the design formulas with reference to well vertical depth and is:
G, then can find the value of indicatrix according to the size of TVD, its design formulas is:
In above formula, V is the curve values of corresponding TVD, T1 be before any vertical depth, T2 be after any vertical depth, V1 be before any curve values, V2 be after any curve values.
H, prediction is carried out to each point of well track just can obtain a continuous print logging prediction curve.
I, logging prediction curve is bored curve comparison with real, just can judge whether correctly set up stratigraphic model, and then formation model is revised.
To sum up, there is the prediction curve along well track in situation in energy calculation of complex tomography of the present invention, by with real comparative analysis of boring curve, can differentiate that whether stratigraphic model correct, and guide the correction of stratigraphic model, be conducive to the Drilling ratio of raising reservoir.The easy-to-use computer language of algorithm realizes.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the technical solution adopted in the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.The technological means that the present invention does not elaborate, all can adopt prior art means.

Claims (6)

1. well logging during curve prediction method under a tomography condition, it is characterized in that: based on the reference well information that well logging during well in operation is other, in conjunction with the track of drilling well and stratigraphic model, calculate the logging prediction curve along well track, logging prediction curve is bored curve comparison with real, judge that whether the stratigraphic model set up is correct, formation model is revised.
2. well logging during curve prediction method under tomography condition according to claim 1, it is characterized in that, described method specifically comprises the steps:
A, to reference to well interval of interest, determine the layer position of representative curve;
B, in the layer position of the representative curve determined, calculate well track, calculate the vertical depth of indicatrix value and substratum;
C, by step b result of calculation import stratigraphic model, set up the relation of well track and stratigraphic model, adopt chained list manage stratigraphic model, each fault block has a tomography and multiple bed boundary;
D, according to the stratigraphic model relation set up, judge the fault block residing for point on well track, then judge this layer position residing for point successively;
At the bottom of point in e, respectively calculation procedure d to layer top and layer, the vertical distance of two line segments, represents with L1 and L2 respectively;
F, calculating well track current point correspond to reference to well vertical depth TVD;
G, then find the value of indicatrix according to the size of TVD;
H, prediction is carried out to each point of well track obtain a continuous print logging prediction curve;
I, logging prediction curve is bored curve comparison with real, judge that whether the stratigraphic model set up is correct, formation model is revised.
3. well logging during curve prediction method under tomography condition according to claim 2, it is characterized in that: in described step a, select the meticulous division of well logging Qu Jinhang that cross directional variations is stable, take natural gamma (GR), resistivity (RT) curve as calibration curve, determine the layer position of representative curve.
4. well logging during curve prediction method under the tomography condition according to Claims 2 or 3, it is characterized in that: in described step b, input well oblique angle (DEV) and direction of deflection (DAZ), application curvature method calculates well track, and calculating with vertical depth is the indicatrix value of index and the vertical depth of substratum.
5. well logging during curve prediction method under tomography condition according to claim 4, it is characterized in that: in described step f, if the corresponding vertical depth with reference to well in layer top is TVD1, the corresponding vertical depth with reference to well is TVD2 at the layer end, then well track current point corresponding to the design formulas with reference to well vertical depth is: .
6. well logging during curve prediction method under tomography condition according to claim 5, is characterized in that: in described step g, and the value design formulas of indicatrix is:
In above formula, V is the curve values of corresponding TVD, T1 be before any vertical depth, T2 be after any vertical depth, V1 be before any curve values, V2 be after any curve values.
CN201410367695.7A 2014-07-30 2014-07-30 Logging-while-drilling curve prediction method under fault condition Expired - Fee Related CN104265279B (en)

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CN107091081A (en) * 2017-06-02 2017-08-25 中国石油天然气股份有限公司 Method and system for early warning of drilling fault in drilling process
CN108547611A (en) * 2018-03-01 2018-09-18 杭州迅美科技有限公司 Horizontal well complex environment is with brill electromagnetic wave resistivity logging rapid simulation method
CN108625842A (en) * 2017-03-22 2018-10-09 中国石油化工股份有限公司 A kind of wellbore trace control method and system
CN110231660A (en) * 2019-05-15 2019-09-13 防灾科技学院 The method of the dislocation amount of buried active fault is determined using magnetic susceptibility log method
CN112901070A (en) * 2019-12-03 2021-06-04 中国石油天然气股份有限公司 Horizontal well tracking while drilling method and control method for controlling drilling direction of drill bit
CN113379907A (en) * 2020-03-10 2021-09-10 中国石油天然气股份有限公司 Method and device for constructing fault block geological model
CN113743175A (en) * 2020-10-21 2021-12-03 中国石油天然气集团有限公司 Stratum inclination angle analysis method and device, computer equipment and storage medium
CN114564800A (en) * 2022-02-25 2022-05-31 北京金阳普泰石油技术股份有限公司 Vertical thickness longitudinal fitting method and system for horizontal well logging curve

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108625842A (en) * 2017-03-22 2018-10-09 中国石油化工股份有限公司 A kind of wellbore trace control method and system
CN107091081A (en) * 2017-06-02 2017-08-25 中国石油天然气股份有限公司 Method and system for early warning of drilling fault in drilling process
CN107091081B (en) * 2017-06-02 2020-11-03 中国石油天然气股份有限公司 Method and system for early warning of drilling fault in drilling process
CN108547611A (en) * 2018-03-01 2018-09-18 杭州迅美科技有限公司 Horizontal well complex environment is with brill electromagnetic wave resistivity logging rapid simulation method
CN108547611B (en) * 2018-03-01 2022-02-11 杭州迅美科技有限公司 Method for rapidly simulating logging of electromagnetic wave resistivity while drilling in complex environment of horizontal well
CN110231660A (en) * 2019-05-15 2019-09-13 防灾科技学院 The method of the dislocation amount of buried active fault is determined using magnetic susceptibility log method
CN112901070A (en) * 2019-12-03 2021-06-04 中国石油天然气股份有限公司 Horizontal well tracking while drilling method and control method for controlling drilling direction of drill bit
CN113379907A (en) * 2020-03-10 2021-09-10 中国石油天然气股份有限公司 Method and device for constructing fault block geological model
CN113743175A (en) * 2020-10-21 2021-12-03 中国石油天然气集团有限公司 Stratum inclination angle analysis method and device, computer equipment and storage medium
CN113743175B (en) * 2020-10-21 2024-05-31 中国石油天然气集团有限公司 Stratum inclination analysis method and device, computer equipment and storage medium
CN114564800A (en) * 2022-02-25 2022-05-31 北京金阳普泰石油技术股份有限公司 Vertical thickness longitudinal fitting method and system for horizontal well logging curve

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