CN106194163A - 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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- CN106194163A CN106194163A CN201610607955.2A CN201610607955A CN106194163A CN 106194163 A CN106194163 A CN 106194163A CN 201610607955 A CN201610607955 A CN 201610607955A CN 106194163 A CN106194163 A CN 106194163A
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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 2
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000004458 analytical method Methods 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 210000003746 feather Anatomy 0.000 claims description 7
- 238000011084 recovery Methods 0.000 claims description 6
- 238000007405 data analysis Methods 0.000 claims description 5
- 239000003129 oil well Substances 0.000 claims description 5
- 238000007796 conventional method Methods 0.000 abstract description 2
- 238000001595 flow curve Methods 0.000 abstract 1
- 230000035699 permeability Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 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
- 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
-
- 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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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
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 automatically
System of selection.
Background technology
The Well Test Technology of Oil/gas Well is understanding oil-gas reservoir, carries out hydrocarbon reservoir evaluation and production performance observation and assessment completion
The important means of effect.Well test analysis by bottom pressure mutation analysis is obtained stratum dynamic and static state parameters, as in-place permeability,
Skin factor, bottom-hole storage coefficient, pressure boundary, strata pressure etc., for formulation and the adjustment offer section of Oil and gas field development scheme
Learn foundation.
At present, main well test analysis means are the modern well test analysis methods utilizing well test curve match.Use the modern times
Well test data is explained by well test analysis method, and for major part test layer, Explanation Accuracy can meet Reservoir Analysis,
But the problem that some special test curves then exist parameters precision difference, serious can make us that Oil Reservoir Types is produced mistake
Understanding.Conclude and be primarily present problems with: 1, modern well test analysis method build-up analysis method is at radial flow
Calculate parameter on the basis of dynamic section, if Radial Flow section does not occur, just cannot calculate reservoir parameter, survey the most just cannot be provided
Examination interpretation results.2, pressure restoration methods assumes that a bite well is with constant rate of production q (m3/ d) produce tpH () time, then closing well enters
Row pressure buildup test, is calculated by percolation equationk.If real well yield is unstable, then using constant rate of production to calculate will
Cause parameter inaccurate.3, build-up analysis method is just for the explanation of a closed-in time section, for driving a well for a long time
Pressure information can not effectively explain, therefore explain reservoir be limited in scope, it is impossible to full appreciation reservoir boundaries character.For
These problems, apply 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, the i.e. curve plate of current multiplex modern well test interpretation method is intended
Conjunction method, other method needs explanation personnel rule of thumb subjective judgment, does not has quantitative choosing standard.
Summary of the invention
The technical problem to be solved is to provide a kind of oil-water well well test data and explains automatic selecting method, solves
The most only use the parameter multi-solution of modern well test analysis method existence and the problem that degree of accuracy is low.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is: a kind of oil-water well well test data is explained certainly
Dynamic system of selection, including 5 steps: first step be measure oil well opening well and making production a period of time after in closing well recovery time
Bottom pressure value, obtains the variation relation of bottom pressure and time, draws observed pressure history curve；Second step is to judge
Whether there is the test phase of multiple switching well on observed pressure history curve, and well opening time be 2.5 times of the closed-in time with
On, the most then use deconvolution means of interpretation；If it is not, then enter step 3；3rd step is split well stream moving curve profit
Carry out fitting a straight line with method of least square, if correlation coefficient is more than 0.95, then enter step 4；Otherwise, varying flow rate is selected to explain
Method；4th step is to draw pressure derivative and the double logarithmic curve of time and pressure and the double logarithmic curve of time, if any
Radial flow occurs, then select the conventional Well Test Data Analysis Method under average discharge；As not having radial flow to occur, then enter the 5th step
Suddenly；5th step is the double-log at the double logarithmic curve of the pressure derivative occurred without radial flow and time and pressure with time
On curve, if there is branch feathers, then use early well testing analytical method；Without occurring that branch feathers then uses pressure
Speed means of interpretation.
The invention has the beneficial effects as follows: according to the scope of application of every kind of method, comprehensive conventional Well Test Data Analysis Method, in early days examination
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, it is provided that one automatically selects means of interpretation, has provided tried hard to keep to solution parameter many solutions problem and raising parameter degree of accuracy
Barrier.
Accompanying drawing explanation
Fig. 1 is the flow chart of the oil-water well well test data explanation automatic selecting method of the present invention；
Fig. 2 is the pressure curves of embodiment 1；
Fig. 3 is Δ p-Δ t and the Δ p'-Δ t log-log graph that embodiment 1 utilizes varying flow rate means of interpretation；
Fig. 4 is the embodiment 1 Δ p-Δ t that utilizes conventional method to explain and Δ p'-Δ t log-log graph；
Fig. 5 is the pressure curves of embodiment 2；
Fig. 6 is Δ p-Δ t and the Δ p'-Δ t log-log graph of embodiment 2.
Detailed description of the invention
With detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings:
As it is shown in figure 1, the oil-water well well test data of the present invention explains automatic selecting method, including 5 steps: first step
Suddenly it is to measure the bottom pressure value in closing well after oil well opening well and making production a period of time recovery time, obtains bottom pressure and time
Variation relation, draws observed pressure history curve；Second step is to judge whether exist repeatedly on observed pressure history curve
Switch the test phase of well, and well opening time is more than 2.5 times of closed-in time, the most then use deconvolution means of interpretation；If
Not, then step 3 is entered；3rd step is that split well stream moving curve utilizes method of least square to carry out fitting a straight line, if relevant
Coefficient is more than 0.95, then enter step 4；Otherwise, varying flow rate means of interpretation is selected；4th step be draw pressure derivative with
The double logarithmic curve of time and pressure and the double logarithmic curve of time, occur if any radial flow, then select under average discharge is normal
Rule Well Test Data Analysis Method；As not having radial flow to occur, then enter the 5th step；5th step is occurring without radial flow
Pressure derivative and the double logarithmic curve of time and pressure, with on the double logarithmic curve of time, if there is branch feathers, then use
Early well testing analytical method；Without occurring that branch feathers then uses pressure rates means of interpretation.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, to this
The embodiment of invention is described in further details.
Embodiment 1
Fort, south 1-3 well perforated interval is 2745.6-2802.6m, and thickness is 38.2m, and well log interpretation is oil-water common-layer.In
Within 2005, December uses oil pipe conveying underbalance perforating+formation testing+flowing back by hydraulic pump (seeking product) three to enter as oil testing tech on the 19th
Row formation testing, once drive a well 66min, and closing well recovers 1781min, and secondary drives a well discharge opeing 60h.
Step one: measure in oil well opening well and making production a period of time (66min) shut-in pressure recovery time (1781min) afterwards
Bottom pressure value, obtains the variation relation of bottom pressure and time, draws observed pressure history curve, sees Fig. 2.
Step 2: judge whether to exist on observed pressure history curve the test phase of multiple switching well, and well opening time
It it is more than 2.5 times of the closed-in time.From Fig. 2 and test process, there is not multiple switching well in this well, only one open+one pass+
Two open, and therefore, enter step 3.
Step 3: split well stream moving curve 13.7h to 14.8h section utilizes method of least square to carry out fitting a straight line, 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.Close
Well double-log derivative curve is linear flow in early days, and the later stage enters the obvious radial flow stage, sees Fig. 3.Matching reservoir parameter is: table
Skin coefficient is-2.47, and permeability is 0.04 × 10-3μm2, radius of investigation is 58.9m.And use the Modern test well of average product to divide
Analysis method, closing well double-log derivative curve later stage intersection, obvious radial flow does not occurs, sees Fig. 4, therefore fitting parameter precision is the highest,
The parameter that matching obtains is: skin factor is-4.41, and permeability is 0.571 × 10-3μm2, radius of investigation is 50.2m.
Automatically select explanation to terminate.
Embodiment 2
Between 12-54x well C2-1 layer test zone 2024.80-2026.80m, thickness is 2m, and well log interpretation is oil-water common-layer.
Using MFE to make test technology across penetrating connection every survey on March 9th, 2013 to March 19, test process includes that one open-one close two is opened and takes out
Drawing, the most once drive a well 90min, and one time closing well recovers 1497min.
Step one: measure in oil well opening well and making production a period of time (90min) shut-in pressure recovery time (1497min) afterwards
Bottom pressure value, obtains the variation relation of bottom pressure and time, draws observed pressure history curve, sees Fig. 5.
Step 2: judge whether to exist on observed pressure history curve the test phase of multiple switching well, and well opening time
It it is more than 2.5 times of the closed-in time.From Fig. 5 and test process, although there is multiple switching well in this well, but well opening time
Being only 90min, and closing well recovery time is 1497min, well opening time is less than 2.5 times of the closed-in time, therefore, enters step
Three.
Step 3: split well stream moving curve 17.5h to 19.24h section utilizes method of least square to carry out fitting a straight line, is intended
Conjunction formula is P=0.592t-1.6006, coefficient R 2=0.9787, more than 0.95, therefore enters step 4.
Step 4: draw the double logarithmic curve of pressure derivative and the double logarithmic curve of time and pressure and time, have radially
Flow out existing, see Fig. 6, then select the conventional Well Test Data Analysis Method under average discharge.
Step 5: at the double-log of the double logarithmic curve of the pressure derivative occurred without radial flow and time and pressure with time
On curve, branch feathers does not occur, sees Fig. 6, then use pressure rates means of interpretation." constant bottom-hole storage+radial direction is multiple in selection
Close+infinitely great " reservoir parameter that obtains of models fitting is: effective permeability 1.05 × 10-3μm2, flow coefficient 6.18 × 10-3μ
m2.m/mPa.s, skin factor-1.66, compound radius 7.05m.
Automatically select explanation to terminate.
In sum, present disclosure is not limited in the above embodiments, and the knowledgeable people in same area can
Can propose other embodiment within technological guidance's thought of the present invention easily, but this embodiment is included in this
Within the scope of bright.
Claims (1)
1. an oil-water well well test data explains automatic selecting method, it is characterised in that include five steps:
First step: measure the bottom pressure value in closing well after oil well opening well and making production a period of time recovery time, obtain shaft bottom
Pressure and the variation relation of time, draw observed pressure history curve；
Second step: judge whether to exist on observed pressure history curve the test phase of multiple switching well, and well opening time
It is more than 2.5 times of the closed-in time, the most then uses deconvolution means of interpretation；If it is not, then enter step 3；
3rd step: split well stream moving curve utilizes method of least square to carry out fitting a straight line, if correlation coefficient is more than 0.95, then
Enter step 4；Otherwise, varying flow rate means of interpretation is selected；
4th step: draw the double logarithmic curve of pressure derivative and the double logarithmic curve of time and pressure and time, if any footpath
Existing to flowing out, then select the conventional Well Test Data Analysis Method under average discharge；As not having radial flow to occur, then enter the 5th step
Suddenly；
5th step: at the double-log of the double logarithmic curve of the pressure derivative occurred without radial flow and time and pressure with time
On curve, if there is branch feathers, then use early well testing analytical method；Without occurring that branch feathers then uses pressure
Speed means of interpretation.
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| CN201610607955.2A CN106194163B (en) | 2016-07-26 | 2016-07-26 | Automatic selection method for interpretation of well testing data of oil-water well |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108614902A (en) * | 2016-12-09 | 2018-10-02 | 中国石油化工股份有限公司 | A kind of shale gas well creation data analysis method producing system variation |
| CN110486009A (en) * | 2019-09-02 | 2019-11-22 | 合肥鼎盛锦业科技有限公司 | A kind of automatic reverse method of parameter and system on infinity stratum |
| CN112211627A (en) * | 2020-10-30 | 2021-01-12 | 西南石油大学 | Selection method of low-permeability gas reservoir interference well testing test well |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614902A (en) * | 2016-12-09 | 2018-10-02 | 中国石油化工股份有限公司 | A kind of shale gas well creation data analysis method producing system variation |
| 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 |
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| CN110486009A (en) * | 2019-09-02 | 2019-11-22 | 合肥鼎盛锦业科技有限公司 | A kind of automatic reverse method of parameter and system on infinity stratum |
| 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 |
| CN112211627A (en) * | 2020-10-30 | 2021-01-12 | 西南石油大学 | Selection method of low-permeability gas reservoir interference well testing test well |
| 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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