CN106194163B - Automatic selection method for interpretation of well testing data of oil-water well - Google Patents
Automatic selection method for interpretation of well testing data of oil-water well Download PDFInfo
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- CN106194163B CN106194163B CN201610607955.2A CN201610607955A CN106194163B CN 106194163 B CN106194163 B CN 106194163B CN 201610607955 A CN201610607955 A CN 201610607955A CN 106194163 B CN106194163 B CN 106194163B
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- 238000012360 testing method Methods 0.000 title claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 238000010187 selection method Methods 0.000 title abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000004458 analytical method Methods 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 238000011084 recovery Methods 0.000 claims description 8
- 210000003746 feather Anatomy 0.000 claims description 6
- 238000007405 data analysis Methods 0.000 claims description 5
- 239000003129 oil well Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 238000007796 conventional method Methods 0.000 abstract description 2
- 238000001595 flow curve Methods 0.000 abstract 1
- 230000035699 permeability Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 241001269238 Data Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
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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
- E21B47/00—Survey of boreholes or wells
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Abstract
The invention discloses an automatic selection method for interpretation of well testing data of an oil-water well, which comprises the following 5 steps: firstly, measuring an actually measured pressure historical curve; secondly, judging whether a plurality of well opening and closing test stages exist, wherein the well opening time is more than 2.5 times of the well closing time, and if so, adopting a deconvolution method; if not, entering a third step; thirdly, performing straight line fitting on the open-hole flow curve, and if the correlation coefficient is greater than 0.95, entering a fourth step; otherwise, selecting a variable yield method; fourthly, drawing a double logarithmic curve, and if radial flow occurs, selecting a conventional method; if no radial flow occurs, step five; fifthly, on a double logarithmic curve without radial flow, if the bifurcation characteristic appears, an early well testing analysis method is adopted; if no bifurcation feature is present, a pressure rate interpretation method is employed. Powerful guarantee is provided for solving the problem of parameter multi-solution and improving the parameter accuracy.
Description
Technical field
The present invention relates to a kind of oil-water well well test data means of interpretation, especially a kind of oil-water well well test data is explained automatic
Selection method.
Background technique
The Well Test Technology of oil/gas well is understanding oil-gas reservoir, carries out hydrocarbon reservoir evaluation and production performance observation and assessed well
The important means of effect.Well test analysis by obtaining stratum dynamic and static state parameters to bottom pressure mutation analysis, as in-place permeability,
Skin factor, bottom-hole storage coefficient, pressure boundary, strata pressure etc. provide section for the formulation and adjustment of Oil and gas field development scheme
Learn foundation.
Currently, main well test analysis means are the modern well test analysis methods using well test curve match.Using the modern times
Well test analysis method explains well test data, and Explanation Accuracy can satisfy Reservoir Analysis for most of test layer,
But then there is a problem of parameters precision difference to some special test curves, it is serious that us can be made to generate mistake to Oil Reservoir Types
Understanding.Conclude and be primarily present following problems: 1, modern well test analysis method build-up analysis method is in radial flow
Calculating parameter can not just calculate reservoir parameter if Radial Flow section does not occur on the basis of dynamic section, also can not just provide survey
Try interpretation results.2, pressure recovery method assumes that a well with constant rate of production q (m3/ d) production tp(h) time, then closing well into
Row pressure recovery test, is calculated by percolation equationk.It, will using constant rate of production calculating if practical well production is unstable
Cause parameter inaccurate.3, build-up analysis method just for closed-in time section explanation, for driving a well for a long time
Pressure information cannot effectively explain, therefore explain reservoir be limited in scope, be unable to full appreciation reservoir boundaries property.For
These problems, applied during Fine structural interpretation early test interpretation method, variable-flow stacking method, numerical solution method,
The new methods such as deconvolution means of interpretation.During well test analysis, multi-purpose modern well test interpretation method, that is, curve plate is quasi- at present
Conjunction method, other methods need the personnel's of explaining rule of thumb subjective judgement, do not have quantitative choosing standard.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of oil-water well well test datas to explain automatic selecting method, solution
The certainly only problem low with parameter multi-solution existing for modern well test analysis method and accuracy.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that: a kind of oil-water well well test data explain from
Dynamic selection method, including 5 steps: first step is in measurement oil well opening well and making production rear closing well recovery time for a period of time
Bottom pressure value obtains the variation relation of bottom pressure and time, draws observed pressure history curve；Second step is judgement
Whether there is the test phase of multiple switching well on observed pressure history curve, and well opening time be 2.5 times of closed-in time with
On, if so, using deconvolution means of interpretation；If it is not, then entering step three；Third step is split well stream moving curve benefit
Straight line fitting is carried out with least square method, if related coefficient is greater than 0.95, enters step four；Otherwise, varying flow rate is selected to explain
Method；4th step is the double logarithmic curve for drawing pressure derivative and time and the double logarithmic curve of pressure and time, if any
Radial flow occurs, then selects the conventional Well Test Data Analysis Method under average flow rate；Such as occur without radial flow, then enters the 5th step
Suddenly；5th step is the double logarithmic curve of the pressure derivative and time that occur in no radial flow and the double-log of pressure and time
On curve, if there is branch feathers, then early well testing analytical method is used；Pressure is used if there are not branch feathers
Rate means of interpretation.
The beneficial effects of the present invention are: comprehensive routine Well Test Data Analysis Method, early stage try according to the scope of application of every kind of method
The principle of the new methods such as well means of interpretation, variable-flow stacking method, pressure rates means of interpretation, deconvolution means of interpretation and spy
Point provides one kind and automatically selects means of interpretation, tries hard to keep to solving the problems, such as that parameter solves to have provided with raising parameter accuracy more
Barrier.
Detailed description of the invention
Fig. 1 is the flow chart that oil-water well well test data of the invention explains automatic selecting method；
Fig. 2 is the pressure curves of embodiment 1；
Fig. 3 is Δ p- Δ t and Δ p'- Δ t log-log graph of the embodiment 1 using varying flow rate means of interpretation；
Fig. 4 is the Δ p- Δ t and Δ p'- Δ t log-log graph that embodiment 1 is explained using conventional method；
Fig. 5 is the pressure curves of embodiment 2；
Fig. 6 is the Δ p- Δ t and Δ p'- Δ t log-log graph of embodiment 2.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and detailed description:
As shown in Figure 1, oil-water well well test data of the invention explains automatic selecting method, including 5 steps: first step
Suddenly it is the bottom pressure value after measuring oil well opening well and making production for a period of time in closing well recovery time, obtains bottom pressure and time
Variation relation draws observed pressure history curve；Second step is judged on observed pressure history curve with the presence or absence of multiple
The test phase of well is switched, and well opening time is 2.5 times of the closed-in time or more, if so, using deconvolution means of interpretation；If
It is not then to enter step three；Third step is split well stream moving curve using least square method progress straight line fitting, if related
Coefficient is greater than 0.95, then enters step four；Otherwise, varying flow rate means of interpretation is selected；4th step be draw pressure derivative with
The double logarithmic curve and pressure of time and the double logarithmic curve of time occur if any radial flow, then select normal under average flow rate
Advise Well Test Data Analysis Method；Such as occur without radial flow, then enters the 5th step；5th step is that occur in no radial flow
On the double logarithmic curve and pressure and the double logarithmic curve of time of pressure derivative and time, if there is branch feathers, then use
Early well testing analytical method；Pressure rates means of interpretation is used if there are not branch feathers.
To make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to embodiment and attached drawing, to this
The embodiment of invention is described in further details.
Embodiment 1
Southern fort 1-3 well perforated interval is 2745.6-2802.6m, and with a thickness of 38.2m, well log interpretation is oil-water common-layer.In
On December 19th, 2005 using oil pipe conveying underbalance perforating+formation testing+flowing back by hydraulic pump (asking production) three make oil testing tech into
Row formation testing, once drive a well 66min, and one time closing well restores 1781min, the secondary drain 60h that drives a well.
Step 1: measurement oil well opening well and making production is for a period of time (66min) afterwards in shut-in pressure recovery time (1781min)
Bottom pressure value obtains the variation relation of bottom pressure and time, draws observed pressure history curve, sees Fig. 2.
Step 2: judge the test phase that whether there is multiple switching well on observed pressure history curve, and well opening time
It is 2.5 times or more of closed-in time.By Fig. 2 and test process it is found that the well be not present multiple switching well, only one open+one pass+
Two open, and therefore, enter step three.
Step 3: split well stream moving curve 13.7h to 14.8h sections carries out straight line fitting using least square method, is intended
Conjunction formula is P=2.3714t-17.091, coefficient R2=0.8674, less than 0.95, therefore select varying flow rate means of interpretation.It closes
Well double-log derivative curve early stage is linear flow, and the later period enters the apparent radial flow stage, sees Fig. 3.It is fitted reservoir parameter are as follows: table
Skin coefficient is -2.47, and permeability is 0.04 × 10-3μm2, radius of investigation 58.9m.And use the Modern test well point of average product
Analysis method, the closing well double-log derivative curve later period intersects, does not occur obvious radial flow, see Fig. 4, therefore fitting parameter precision is not high,
It is fitted the parameter obtained are as follows: skin factor is -4.41, and permeability is 0.571 × 10-3μm2, radius of investigation 50.2m.
Automatically selecting explanation terminates.
Embodiment 2
Between C2-1 layers of test zone 2024.80-2026.80m of 12-54x well, with a thickness of 2m, well log interpretation is oil-water common-layer.
Test technology is made across penetrating connection every survey using MFE on March 9th, 2013 to March 19, test process includes that one open-one close two opens pumping
It draws, wherein the 90min that once drives a well, one time closing well restores 1497min.
Step 1: measurement oil well opening well and making production is for a period of time (90min) afterwards in shut-in pressure recovery time (1497min)
Bottom pressure value obtains the variation relation of bottom pressure and time, draws observed pressure history curve, sees Fig. 5.
Step 2: judge the test phase that whether there is multiple switching well on observed pressure history curve, and well opening time
It is 2.5 times or more of closed-in time.By Fig. 5 and test process it is found that although the well has a multiple switching well, but well opening time
Only 90min, and closing well recovery time is 1497min, well opening time is less than 2.5 times of closed-in time, therefore, enters step
Three.
Step 3: split well stream moving curve 17.5h to 19.24h sections carries out straight line fitting using least square method, is intended
Conjunction formula is P=0.592t-1.6006, coefficient R 2=0.9787, is greater than 0.95, therefore enters step four.
Step 4: the double logarithmic curve of pressure derivative and time and the double logarithmic curve of pressure and time are drawn, there is radial direction
Outflow is existing, sees Fig. 6, then selects the conventional Well Test Data Analysis Method under average flow rate.
The reservoir parameter for selecting " constant bottom-hole storage+radial compound+infinity " models fitting to obtain are as follows: effective permeability
1.05×10-3μm2, flow coefficient 6.18 × 10-3μm2.m/mPa.s, skin factor -1.66, compound radius 7.05m.
Automatically selecting explanation terminates.
In conclusion the contents of the present invention are not limited in the above embodiments, the knowledgeable people in same area can
Can propose other embodiments easily within technological guidance's thought of the invention, but this embodiment is included in this hair
Within the scope of bright.
Claims (1)
1. a kind of oil-water well well test data explains automatic selecting method, which is characterized in that including five steps:
First step: the bottom pressure value in measurement oil well opening well and making production rear closing well recovery time for a period of time obtains shaft bottom
The variation relation of pressure and time draws observed pressure history curve；
Second step: judge the test phase that whether there is multiple switching well on observed pressure history curve, and well opening time
It is 2.5 times or more of closed-in time, if so, using deconvolution means of interpretation；If it is not, then entering step three；
Third step: split well stream moving curve carries out straight line fitting using least square method, if related coefficient is greater than 0.95,
Enter step four；Otherwise, varying flow rate means of interpretation is selected；
4th step: the double logarithmic curve of pressure derivative and the double logarithmic curve of time and pressure and time is drawn, if any diameter
It is existing to outflow, then select the conventional Well Test Data Analysis Method under average flow rate；Such as occur without radial flow, then enters the 5th step
Suddenly；
5th step: entire pressure derivative and the double logarithmic curve of time and pressure and the double logarithmic curve of time are in no radial direction
Outflow is current, if there is branch feathers, then uses early well testing analytical method；Using pressure if there are not branch feathers
Power rate means of interpretation.
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| CN108614902B (en) * | 2016-12-09 | 2021-06-22 | 中国石油化工股份有限公司 | Shale gas well production data analysis method with changed production system |
| CN107587870A (en) * | 2017-09-11 | 2018-01-16 | 中国石油大学(北京) | Shale gas fracturing work down-hole accident monitors and method for early warning and system |
| CN110486009B (en) * | 2019-09-02 | 2023-10-31 | 合肥鼎盛锦业科技有限公司 | Automatic parameter reverse solving method and system for infinite stratum |
| CN112211627B (en) * | 2020-10-30 | 2022-03-11 | 西南石油大学 | Selection method of low-permeability gas reservoir interference well testing test well |
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| US20040251021A1 (en) * | 2003-06-13 | 2004-12-16 | Schlumberger Technology Corporation, Incorporated In The State Of Texas | Apparatus and methods for canceling the effects of fluid storage in downhole tools |
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