CN106522928A - Pump stopping wellhead pressure drop measuring transient well test method after acid fracturing - Google Patents
Pump stopping wellhead pressure drop measuring transient well test method after acid fracturing Download PDFInfo
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- 230000001052 transient effect Effects 0.000 title claims abstract description 26
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 12
- 239000011435 rock Substances 0.000 claims abstract description 12
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- 230000001186 cumulative effect Effects 0.000 claims description 3
- 230000000704 physical effect Effects 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 2
- 238000000547 structure data Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 abstract description 4
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- 210000002615 epidermis Anatomy 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005325 percolation Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 210000003491 skin Anatomy 0.000 description 2
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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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
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention relates to a pump stopping wellhead pressure drop measuring transient well test method after acid fracturing. The method comprises the following steps that (1) pressure data in the whole acid fracturing process are recorded; (2) different fluid displacement data are recorded; (3) a well depth structure and the productive section well diameter are obtained; (4) frictional resistance is obtained; (5) well bottom pressure data in the whole acid fracturing process are simulated; (6) the effective reservoir thickness is gained; (7) the weighted porosity of the effective reservoir porosity is gained; (8) a rock compressibility coefficient is gained; (9) the formation pressure is converted, and the well bottom formation temperature is gained; (10) water saturation is obtained; (11) a water injection pressure drop transient well test analysis model is established; (12) all relevant parameter of the selected analytic model are obtained; and (13) all the parameters are obtained for reservoir evaluation. Through the method, the formation parameters are effectively obtained for reservoir evaluation. The test cost is reduced, the test construction risks are reduced, the individual well yield is not influenced, and the dynamic test data gaining rate is increased.
Description
Technical field
The invention belongs to petroleum technology field, is related to termination of pumping well logging mouth Pressure-drop instability well testing side after a kind of acid fracturing
Method.
Background technology
Existing transient well test technology includes two kinds：
1. it is, a kind of to recover transient well test for pressure, be that Oil/gas Well was gone into operation after a period of time, using steel wire well testing winch or
Cable well testing winch is thrown in into high accuracy memory-type or direct reading electronic gauge to shaft bottom, is monitored certain under opening well and making production state
Surface shut-in or downhole closing after time bottom hole pressure bomb measuring point flowing pressure, record bottom hole pressure bomb measuring point pressure after closing well
Recover data, in conjunction with yield data when producing before Oil/gas Well closing well, carry out pressure and recover transient well test analysis.
2., another kind of is drop of pressure transient well test, is thrown in water filling well shaft into high accuracy storage or direct-reading
Formula electronic pressure gauge, records certain hour bottom pressure, then ground or downhole closing under charging state, pressure gauge will be recorded
Bottom pressure landing data after closing well, carry out Pressure-drop instability well test analysis with reference to injection rate data during injection.
The test of transient well test at present, mainly for obtaining strata pressure, reservoir pollution, percolation ability, border condition four
Partial parameters.For border condition is obtained, longer shut-in time for pressure survey is generally required in low permeability reservoir.In HTHP ultra-deep
Under the complex well conditions such as well, deep-well, high-hydrogen sulfide well, live pressure measurement technique is had high demands to test equipment, and process implementing is difficult
Degree is big, causes the admission of well testing test data difficult.And work progress be susceptible to down-hole accident (enter well tool string to be hampered, meet card,
Steel wire or cable fracture, enter well tool string and fall well, cause down-hole fish), having a strong impact on the later stage normally production and safeguards.While by
Recover to affect yield in closing well test pressure, test data acceptance rate is low.Obtain to every formation parameter and Reservoir Analysis evaluation
Bring difficulty.
Normal pressures recover transient well test, be during the normal opening well and making production of Oil/gas Well, from wax removal (test) valve,
Using steel wire or cable, throw in into pit shaft into high accuracy memory-type or direct reading electronic gauge.The life that drives a well is recorded first
Normal processes pressure gauge release position flowing pressure is produced, i.e. stream pressure Monitoring Data.Well head or downhole closing afterwards, electronic pressure gauge note
The process that measuring point pressure recovers after the lower closing well of record, i.e. pressure recover data.Using well test analysis software ripe in the market,
Such as Ecrin, PanSystem etc..Production layer wellbore radius, different fluid density, viscosity, production process gas are input in software
The parameters such as oil ratio, reservoir effective thickness, original temperature, pressure, stratigraphic compression coefficient.And import the stream pressure prison recorded by pressure gauge
Survey data and pressure recovers data, and import opening well and making production process streams pressure monitoring section production information.And then selection pressure is recovered
Section, selects the built-in analytic modell analytical model of software to carry out double logarithmic curve, semilog plot, pressure history curve fitting analysis, reaches double
Logarithmic curve, semilog plot, pressure history curve matching work well, and (include well so as to obtain reservoir items seepage parameters
Cylinder condition, reservoir conditions, boundary condition).
Existing pressure recovers transient well test, and defect is：
1., test before first have to into pit shaft under enter drifting instrument carry out drifting (drifting tool string test depth more than survey
Examination tool string desired depth), it is ensured that pit shaft is unimpeded, ensures that testing tool string (carrying pressure gauge tool string) can enter pre-determined bit down
Put, will not be hampered in way or meet card, it is to avoid down-hole accident occur.This will cause testing cost to increase, simultaneously because many
In well shaft, situation is complicated, tool string in lower going-into-well cylinder often occurs and is hampered, meets card, causes tool string to fall well, causes fish,
Have a strong impact on later stage normally production and maintenance.
2. ground or downhole closing, are had to, pressure buildup test is carried out.Closing well carries out pressure buildup test, serious shadow
Ring yield.
3., have to, using steel wire or cable, throw in into pit shaft into high accuracy memory-type or direct reading electronic gauge.
Testing tool string and electronic pressure gauge test process are resided in tubing string always, if output has corrosive fluid in pit shaft, will
Tool string and electronic pressure gauge are damaged.
4., test period is long, including the monitoring of stream pressure and pressure Restoration monitoring.Time-consuming for whole test, and testing cost is high.
Normal pressures landing transient well test, is during water injection well positive injection, from wax removal (test) valve, using steel wire
Or cable, throw in into pit shaft into high accuracy memory-type or direct reading electronic gauge.The injecting process shaft bottom pressure is recorded first
Power is measured and presses force data, i.e. stream pressure Monitoring Data.Well head or downhole closing afterwards, electronic pressure gauge record measuring point after closing well
The process of drop of pressure, i.e. drop of pressure data.Using well test analysis software ripe in the market, such as Ecrin,
PanSystem etc..Pressure-drop instability well test analysis is carried out with reference to injection rate data during injection.Production layer well is input in software
Cylinder radius, different fluid density, viscosity inject wellbore fluids gas liquid ratio, reservoir effective thickness, reservoir original temperature, pressure, ground
The parameters such as layer compression coefficient.And stream pressure Monitoring Data and the drop of pressure data recorded by pressure gauge are imported, and import water filling
Process streams press monitoring section injection rate information.And then selection pressure landing section, select the built-in analytic modell analytical model of software to carry out double-log bent
Line, semilog plot, pressure history curve fitting analysis, reach double logarithmic curve, semilog plot, pressure history curve matching
Work well, so as to obtain reservoir items seepage parameters (including wellbore conditions, reservoir conditions, boundary condition).
Existing drop of pressure transient well test, defect is：
1., test before first have to into pit shaft under enter drifting instrument carry out drifting (drifting tool string test depth more than survey
Examination tool string desired depth), it is ensured that pit shaft is unimpeded, ensures that testing tool string (carrying pressure gauge tool string) can enter pre-determined bit down
Put, will not be hampered in way or meet card, it is to avoid down-hole accident occur.This will cause testing cost to increase, simultaneously because many
In well shaft, situation is complicated, tool string in lower going-into-well cylinder often occurs and is hampered, meets card, causes tool string to fall well, causes fish,
Have a strong impact on later stage normally production and maintenance.
2., test period is long, including the monitoring of stream pressure and drop of pressure monitoring.Time-consuming for whole test, and testing cost is high.
CN201110208804 discloses draw-down test analysis method for underground shut-in water well with low-permeability storage layer, but which is used for not
Flow-after-flow test technique effect is undesirable.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention to provide termination of pumping well logging mouth Pressure-drop instability examination after a kind of acid fracturing
Well method, the present invention can effectively obtain formation parameter, evaluate reservoir.Testing cost is saved, test construction risk is reduced, not shadow
Well yield is rung, dynamic test data acceptance rate is improved.
The invention provides following technical scheme：
Termination of pumping well logging mouth Pressure-drop instability well-logging method after a kind of acid fracturing, including following steps：
(1) acid fracturing process installs electronic pressure gauge in well head, and the electronic pressure gauge is arranged on acid fracturing process
In on any one wellhead assembly, and the PGS of the electronic pressure gauge can receive stream in tubing string with any one
The interface of body pressure is connected, and records acid fracturing overall process pressure data；
(2) gathered using flowmeter and recorded and inject in the acid fracturing overall process different fluid discharge capacity number in pit shaft
According to；
(3) well depth structured data, tubular column structure data, real bored borehole tiltedly depth data and/or real bored borehole vertical depth number are obtained
According to, and obtain pay interval hole diameter；
(4) the physical properties of fluids feature and different fluid of different fluid in the acid fracturing process injection pit shaft are obtained
Frictional resistance in different displacements and under different shaft column structure；
(5) data acquired in (1), (2), (3) and (4) step are utilized, using acid fracturing software, acid fracturing is simulated
Overall process bottom pressure data；
(6) Effective Reservoirs thickness is asked for using well-log information；
(7) ask for the weighting porosity of Effective Reservoirs porosity；
(8) rock compressibility is asked for using weighting porosity obtained by step (7) using H.N.Hall empirical equations；
(9) hydrostatic level depth, reduced reservoir pressure are measured according to drilling process；And with reference to adjacent well, according to this geological province
Block geothermal gradient, asks for downhole formation temperature；
(10) obtain water saturation；
(11) by every underlying parameter obtained by step (2), (5), (6), (7), (8), (9), (10), call in well test analysis soft
In part, Pressure drop instability well test model is set up；
(12) suitable analytic modell analytical model, the down pressure of water injection transient well test set up by fit procedure (11) point are selected in software
Double logarithmic curve, semilog plot and pressure history curve in analysis model, reach fitting effect well, obtain and select parsing mould
Type correlation parameters；
(13) parameters are obtained, to evaluate reservoir.
In such scheme preferably, in step (1), the acid fracturing overall process pressure data includes acid fracturing
After the completion of construction, the pressure data of termination of pumping well logging mouth reduced pressure process.
In any of the above-described scheme preferably, the electron pressure is calculated as the storage of high accuracy HTHP or direct-reading electricity
Sub- pressure gauge.Such as PPS28 quartz storage pressure gauges, PPS Series Pressure meters.
The tubing string be well head acid fracturing completion tubular column, in the tubing string fluid be acid fracturing during inject liquid, the injection
Liquid is acid solution or fracturing fluid.
In any of the above-described scheme preferably, in step (2), the displacement data i.e. when pit shaft injects fluid, often
Minute injection rate.
Pit shaft is exactly the tubing string that fluid is injected in acid fracturing completion tubular column, it can be understood as pit shaft is exactly acid fracturing injection liquid
One flowing pipe.
In any of the above-described scheme preferably, in step (3), when the pay interval hole diameter is that bore hole is produced, it is naked
Eye section drill bit radius；When producing for sleeve pipe or screen casing, it is sleeve pipe or screen casing inside radius；When producing for oil pipe, it is oil pipe inside radius.
It is all enter well casing post data can from scene acquisition.
In any of the above-described scheme preferably, in step (4), the method for obtaining the frictional resistance is using acidifying pressure
The software input pit shaft and shaft column structural simulation different fluid frictional resistance under different displacements is split, or carries out drop discharge capacity at the scene
Survey injection wellbore fluids frictional resistance.
In any of the above-described scheme preferably, in step (4), the acid fracturing software, be FracproPT softwares,
The StimPlan softwares of NS companies, the Terrfrac softwares of Terra Tek companies, the GOHFER softwares of Marathon companies,
The StimPT softwares of the Mfrac softwares of Meyer companies, the 3D HFODS softwares of Southwest Petrol University or Pinnacle companies.It is excellent
Select the FracproPT softwares of Pinnacle companies.
In any of the above-described scheme preferably, physical properties of fluids feature includes fluid constituent, density, viscosity.
In any of the above-described scheme preferably, the reason of bottom pressure in step (5), is simulated during acid fracturing infusion
By formula：Bottom pressure=well head pressure+head of liquid-frictional resistance；During termination of pumping well logging mouth pressure drop：Bottom pressure=well head pressure
+ head of liquid.
In any of the above-described scheme preferably, in step (5), the acid fracturing software is FracproPT softwares, NS
The StimPlan softwares of company, the Terrfrac softwares of Terra Tek companies, the GOHFER softwares of Marathon companies, Meyer
The StimPT softwares of the Mfrac softwares of company, the 3D HFODS softwares of Southwest Petrol University or Pinnacle companies.It is preferred that
The FracproPT softwares of Pinnacle companies.
In any of the above-described scheme preferably, in step (6), straight well Effective Reservoirs thickness is：It is each little in production well section
The cumulative thickness of the vertical thickness of layer Effective Reservoirs；Horizontal well Effective Reservoirs thickness is：Each substratum Effective Reservoirs top bottom in production well section
Tiltedly deep conversion is vertical depth, asks for each substratum vertical depth thickness and adds up again.
In any of the above-described scheme preferably, in step (6), during without test data, using offset wells correlation value.
In any of the above-described scheme preferably, the Effective Reservoirs porosity in carbonate rock oil field is more than 2%, sandstone oil field
Effective Reservoirs porosity be more than 8%.
Logging method is known, is obtained by logging well and explaining.Setting to different type Effective Reservoirs porosity is different,
Part oil field is more than 8% more than 2%, sandstone Effective Reservoirs porosity according to carbonate rock Effective Reservoirs porosity.Can specifically press
According to different blocks standard, with reference to well log interpretation achievement.
Effective Reservoirs refer to according to oil field regulation, well log interpretation out, more than the reservoir of certain porosity threshold
Just it is referred to as Effective Reservoirs.And the reservoir of certain porosity threshold value is less than, as reservoir porosity is too little, the inside is not almost more
Few petroleum resources, just without extraction value, minimum hole also cannot produced fluid.But as reservoir is not continuous sending out in the vertical
Educate.The porosity of different substratums is different, it may be possible to+one dried layer+of Effective Reservoirs of dried layer+of reservoir+
The combination of individual Effective Reservoirs, then need the Effective Reservoirs for obtaining are weighted according to its thickness, asks for weighting porosity.
In any of the above-described scheme preferably, in step (8), adopted formula is H.N.Hall empirical equations：
Wherein, CfFor rock compressibility.
In step (8), adopted formula can also be that Newman formula or Lee pass bright formula.
In any of the above-described scheme preferably, in step (9), asking for for the strata pressure is by drilling process
The density or proportion of drilling fluid in pit shaft, tries to achieve the static pressure of fluid column using formula P=ρ × g × h, and h is drilling process drilling well
The height of liquid hydrostatic column, wherein temperature are tried to achieve by the formation temperature of block offset well.
In step (10), water saturation also can use other according to ideal situation near wellbore zone oil-water displacement efficiency 100%
Value.
In any of the above-described scheme preferably, in step (11), the drop of pressure transient well test model set up is
Down pressure of water injection transient well test analysis or Numerical Well Test Analysis model.
In any of the above-described scheme preferably, the well test analysis software for EPS Fzc of Britain PanSystem and
Panmesh softwares, the Saphir softwares of KAPPA companies of France, the F.A.S.T.WellTest softwares of Fekete companies,
The Welltest200 softwares of Eclipse companies, the WTSystem softwares of CUP companies, Xi'an Petroleum University MWTWINV3.0 it is soft
Part, Swift softwares of Xi'an Hua Xian oil companies etc..
When the model set up is Numerical Well Test Analysis model, Numerical Well Test Analysis are carried out using above-mentioned software.
In any of the above-described scheme preferably, in step (12), the parameters include wellbore conditions, formation condition
And/or entry listed by boundary condition.
Acid fracturing has become product important measures means in individual well increasing the storage, and the present invention utilizes individual well acid fracturing process well head
High accuracy HTHP electronics pressure gauge is installed, pump pressure landing number pressure is surveyed in termination of pumping after admission acid fracturing pressure process and acid fracturing
According to, with reference to acid fracturing process inject pit shaft fluid flow information, carry out drop of pressure transient well test analysis.So as to effectively obtain ground
Layer parameter, evaluates reservoir.Testing cost is saved, test construction risk is reduced, is not affected well yield, improve dynamic test data
Acceptance rate.
The extension of range of application of the present invention：1., the technology of the present invention method range of application is not limited to clastic reservoir rock, also may be used
It is applied to the reservoirs such as carbonate rock.2., the technology of the present invention method range of application is not limited to acid fracturing construction, also apply be applicable to
The technique that fluid improves Reservoir Seepage ability is injected in pickling, pressure break, hydraulic fracturing etc. into stratum.3. water injection well is can be applicable to,
After record the injecting process well head pump pressure and termination of pumping, pump pressure landing data, with reference to the injecting process discharge capacity information, carry out water injecting pump pressure drop
Transient well test.
The invention has the advantages that：
1., need not into pit shaft under enter any tool string, it is entirely avoided the generation of down-hole accident.
2. pump pressure dropping force data is surveyed in termination of pumping after, enrolling acid fracturing process and acid fracturing, normal after not affecting to go into operation
Production.
3., the data admission of this test is carried out simultaneously with acid fracturing construction, is effectively saved on-site construction time.
4., using memory-type high-precise electronic pressure manometer record acid fracturing process well head pump pressure data, greatly save
Test fund cost.
Description of the drawings
Fig. 1 is one preferred embodiment of termination of pumping well logging mouth Pressure-drop instability well-logging method after a kind of acid fracturing of the invention
DH1-1GH well acid fracturing construction curves；
Fig. 2 be preferred embodiment shown in Fig. 1 DH1-1GH well formation testings after well depth structure；
Fig. 3 is that the prepad fluid of preferred embodiment shown in Fig. 1 enters different displacements well-sinking frictional resistance in well casing post at this；
Fig. 4 is that the main acid of preferred embodiment shown in Fig. 1 enters different displacements well-sinking frictional resistance in well casing post at this；
Fig. 5 is that the clear water of preferred embodiment shown in Fig. 1 enters different displacements well-sinking frictional resistance in well casing post at this；
Fig. 6 is the acid fracturing process bottom pressure simulation of preferred embodiment shown in Fig. 1；
Fig. 7 is that pump pressure drop well Test Analysis Model is surveyed in the acid fracturing termination of pumping of preferred embodiment shown in Fig. 1；
Fig. 8 is that the fitting of pump pressure fall-off test double logarithmic curve is surveyed in the acid fracturing termination of pumping of preferred embodiment shown in Fig. 1
Fig. 9 is that the fitting of pump pressure fall-off test semilog plot is surveyed in the acid fracturing termination of pumping of preferred embodiment shown in Fig. 1
Figure 10 is that pump pressure fall-off test pressure history curve matching is surveyed in the acid fracturing termination of pumping of preferred embodiment shown in Fig. 1
Figure 11 is that the superposition inspection of pump pressure fall-off test semilog is surveyed in the acid fracturing termination of pumping of preferred embodiment shown in Fig. 1
Figure 12 is that the normal pressures of preferred embodiment shown in Fig. 1 recover the fitting of transient well test double logarithmic curve
Figure 13 is the flow chart of preferred embodiment shown in Fig. 1.
Specific embodiment
In order to further appreciate that the technical characteristic of the present invention, the present invention is explained in detail with reference to specific embodiment
State.Embodiment only has exemplary effect to the present invention, not with any restricted effect, those skilled in the art
The modification of any unsubstantiality made on the basis of the present invention, should all belong to protection scope of the present invention.
Embodiment 1：
The geologic aspects of the present embodiment：Selected pressure fall-off test well be DH1-1GH, well not Wei gas injection well, construction location is tower
In tub ground North Tarim Uplift Donghetang fracture anticlinal belt No. 1 anticline of East River, completion method is sleeve pipe, and finishing drilling layer position is Carboniferous System east
River sand rock.
Termination of pumping well logging mouth Pressure-drop instability well-logging method after a kind of acid fracturing, including following steps：
1st, acid fracturing process installs the storage of high accuracy HTHP or direct reading electronic gauge in well head, and record is gone into the well
Mouth pressure, casing pressure data, data must be comprising termination of pumping well logging mouth pump pressure landing data.And it is bent to be depicted as acid fracturing construction
Line chart (Fig. 1).
2nd, gathered using flowmeter and recorded and inject in acid fracturing overall process different fluid displacement data in pit shaft；And
It is depicted as acid fracturing construction curve figure (Fig. 1).
3rd, according to finishing drilling well depth structure and enter well casing rod structure, build down-hole string model, learn pay interval hole diameter
0.07854m。
4th, example well acidizing fracturing process injection downhole well fluid has：Prepad fluid (40 side of consumption, density 1.06g/cm3)、
Main acid (100 side of consumption, density 1.06g/cm3), displacement fluid (25 side of consumption, clear water 1.00g/cm3)；Tie in this completion tubular column
Different liquids are simulated in structure per km frictional resistance, and maps (Fig. 3, Fig. 4, Fig. 5).
5th, using the data acquired in 1,2,3,4 steps, it is converted into acid fracturing overall process bottom pressure data (Fig. 6).
6th, well-log information is utilized, asks for Effective Reservoirs (carbonate rock：Porosity is more than 2%；Sandstone：Porosity is more than
8%.Specifically can be according to different blocks standard, with reference to well log interpretation achievement) thickness.Straight well：In production well section, each substratum is effectively stored up
Layer vertical thickness adds up thickness；Horizontal well：It is vertical depth that in production well section, each substratum Effective Reservoirs top bottom is tiltedly converted deeply, is asked for each little
Layer vertical depth thickness is added up again.The example well is horizontal well, asks for Effective Reservoirs thickness for 29m.Obtain from well logging outcome table 1.
1 DH1-1GH borehole logging tool achievements of table
7th, ask for the weighting porosity 16.88% (table 2) of Effective Reservoirs porosity.
2 DH1-1GH wells Effective Reservoirs of table weight porosity
| Substratum | Thickness m | Porosity % | Thickness and porosity product |
| 1 | 99 | 16.5 | 1633.5 |
| 2 | 23 | 18.8 | 432.4 |
| 3 | 25 | 16.5 | 412.5 |
| 4 | 62 | 19.5 | 1209 |
| 5 | 57 | 14.1 | 803.7 |
| Summation | 266 | 16.88 | 4491.1 |
8th, rock compressibility is asked for using weighting porosity obtained by step 7 using H.N.Hall empirical equations.Bring into and ask
Obtain CfFor 0.000561704.
9th, hydrostatic level depth is measured according to drilling process, conversion shaft bottom payzone section strata pressure is 54.19MPa；And reference
Adjacent well, according to this geology block geothermal gradient, asks for downhole formation temperature for 138 DEG C.
10th, water saturation takes 100%.
11st, by every underlying parameter obtained by step 2,5,6,7,8,9,10, call in the built-in Saphir well testings mould of Ecrin softwares
Block analysis, sets up down pressure of water injection transient well test analysis model (Fig. 7).
12nd, drawdown analysis section is selected in software, obtain double logarithmic curve, semilog plot, pressure history curve.Select
Suitable analytic modell analytical model simultaneously adjusts relevant parameter Fitting Analysis, reaches double logarithmic curve, semilog plot, pressure history curve matching
Well.
This example well select analytic modell analytical model be：Well storage+epidermis+homogeneous reservoir+infinity boundary model, adjustment and institute's modeling
The related parameter of type, so as to reach double logarithmic curve, semilog plot, pressure history curve matching it is good (Fig. 8, Fig. 9, Figure 10,
Figure 11).
Parameters related to analytic modell analytical model is selected are obtained, parameter includes：Wellbore conditions, formation condition, boundary condition institute
Row entry (table 3).
Pump pressure fall-off test achievement parameter is surveyed in 3 DH1-1GH well acidizing pressure breaks termination of pumping of table
Note：Infinitely great border refers to as the testing time is not enough, does not test reservoir boundaries feature.
13rd, parameters are obtained, to evaluate reservoir (example well selects double-log analysis results).
There is no pollution in 1., skin factor -4.27, near wellbore zone, acidfracturing treatment works well.
2. liquid flow coefficient 128.95mD m/mPa s, are injected, percolation ability is general.
The short only 20min of pressure drop time is surveyed in the termination of pumping of example well, if the extended testing system time, double logarithmic curve will be more accurate anti-
Reflect flow through oil reservoir information and boundary condition.
2.4 recover transient well test test achievement contrast with normal pressures
Example well closing well after operation carry out normal pressures recover transient well test test, gained double logarithmic curve form with
Obtained by the technology of the present invention method, double logarithmic curve form is basically identical.It is same to select well storage+epidermis+homogeneous reservoir+infinity side
Boundary's models fitting analysis, obtains good fit effect (Figure 12), and obtains relevant parameter (table 4).
4 DH1-1GH wells normal pressures of table recover transient well test achievement parameter
Note：Infinitely great border refers to as the testing time is not enough, does not test reservoir boundaries feature.
Contrast conclusion：
1., double logarithmic curve form obtained by two kinds of evaluation methods is basically identical；Select the consistent analytic modell analytical model can will be right
Double logarithmic curve, semilog plot, pressure history curve matching are good；Skin factor obtained by two methods Fitting Analysis basic one
Cause, different fluid flow coefficient value in the stratum it is basically identical.
2., extend termination of pumping and survey pressure drop time, double logarithmic curve will more accurately reflect flow through oil reservoir information and boundary condition,
Fitting Analysis parameters obtained will be more accurate.
3. termination of pumping, is carried out to the well after acid fracturing and surveys pump pressure drop transient well test analysis, gained achievement parameter can be preliminary
For evaluating Reservoir Seepage feature, and (after-souring fracturing reform, perforations adding change layer, pressure and recover not to be included to next step measure
Flow-after-flow test test etc.) provide and instruct foundation.
The beneficial effect that the technical scheme of 2.5 the present embodiment is brought
Underground work risk is avoided, dynamic test data admission well number is strengthened, is not affected testing well normal after going into operation
Produce, saved on-site construction time, greatly saved test fund cost.
1., need not into pit shaft under enter any tool string, it is entirely avoided the generation of down-hole accident.
2., can be applicable to any hole condition, including high temperature, high pressure, high-hydrogen sulfide etc..Individual well dynamic will be significantly increased
Test data is enrolled, and contributes to instructing later stage measure and production development.
3. pump pressure dropping force data is surveyed in termination of pumping after, enrolling acid fracturing process and acid fracturing, normal after not affecting to go into operation
Production.
4., the data admission of this test is carried out simultaneously with acid fracturing construction, is effectively saved on-site construction time.
5., using memory-type high-precise electronic pressure manometer record acid fracturing process well head pump pressure data, greatly save
Test fund cost.
Claims (10)
1. a kind of termination of pumping well logging mouth Pressure-drop instability well-logging method after acid fracturing, including following steps：
(1) acid fracturing process installs electronic pressure gauge in well head, and the electronic pressure gauge is appointed during being arranged on acid fracturing
On one wellhead assembly of meaning, and the PGS of the electronic pressure gauge can receive fluid pressure in tubing string with any one
The interface of power is connected, and records acid fracturing overall process pressure data；
(2) gathered using flowmeter and recorded and inject in the acid fracturing overall process different fluid displacement data in pit shaft；
(3) well depth structured data, tubular column structure data, real bored borehole tiltedly depth data and/or real bored borehole vertical depth data are obtained, and
Obtain pay interval hole diameter；
(4) the physical properties of fluids feature and different fluid of different fluid in the acid fracturing process injection pit shaft are obtained not
Frictional resistance with discharge capacity and under different shaft column structure；
(5) data acquired in (1), (2), (3) and (4) step are utilized, using acid fracturing software, the full mistake of acid fracturing is simulated
Journey bottom pressure data；
(6) Effective Reservoirs thickness is asked for using well-log information；
(7) ask for the weighting porosity of Effective Reservoirs porosity；
(8) rock compressibility is asked for using weighting porosity obtained by step (7) using formula；
(9) hydrostatic level depth, reduced reservoir pressure are measured according to drilling process；And with reference to adjacent well, according to this geology block ground
Warm gradient, asks for downhole formation temperature；
(10) obtain water saturation；
(11) by every underlying parameter obtained by step (2), (5), (6), (7), (8), (9), (10), call in well test analysis software
It is interior, set up drop of pressure transient well test model；
(12) suitable analytic modell analytical model is selected in software, the down pressure of water injection transient well test analysis mould set up by fit procedure (11)
Double logarithmic curve, semilog plot and pressure history curve in type, reach fitting effect well, obtain and select analytic modell analytical model phase
Close parameters；
(13) parameters are obtained, to evaluate reservoir.
2. after acid fracturing according to claim 1 termination of pumping well logging mouth Pressure-drop instability well-logging method, it is characterised in that：Step
Suddenly in (1), after the completion of the acid fracturing overall process pressure data includes acid fracturing construction, termination of pumping well logging mouth reduced pressure mistake
The pressure data of journey.
3. after acid fracturing according to claim 1 termination of pumping well logging mouth Pressure-drop instability well-logging method, it is characterised in that：Step
Suddenly, in (3), when the pay interval hole diameter is that bore hole is produced, it is Open-Hole Section drill bit radius；When producing for sleeve pipe or screen casing, it is set
Pipe or screen casing inside radius；When producing for oil pipe, it is oil pipe inside radius.
4. after acid fracturing according to claim 1 termination of pumping well logging mouth Pressure-drop instability well-logging method, it is characterised in that：Step
Suddenly, in (4), the method for obtaining the frictional resistance is to be input into pit shaft and shaft column structural simulation using acid fracturing software
Different fluid frictional resistance under different displacements, or carry out at the scene dropping discharge capacity and surveying injecting wellbore fluids frictional resistance.
5. after acid fracturing according to claim 1 termination of pumping well logging mouth Pressure-drop instability well-logging method, it is characterised in that：Step
Suddenly, in (5), the acid fracturing software is FracproPT softwares, StimPlan softwares, T Terrfrac softwares, GOHFER soft
Part, Mfrac softwares, 3D HFODS softwares or StimPT softwares.
6. after acid fracturing according to claim 1 termination of pumping well logging mouth Pressure-drop instability well-logging method, it is characterised in that：Step
Suddenly, in (6), straight well Effective Reservoirs thickness is：The cumulative thickness of the vertical thickness of each substratum Effective Reservoirs in production well section；Horizontal well has
Imitating reservoir thickness is：It is vertical depth that in production well section, each substratum Effective Reservoirs top bottom is tiltedly converted deeply, asks for each substratum vertical depth thickness again
It is cumulative.
7. after acid fracturing according to claim 1 termination of pumping well logging mouth Pressure-drop instability well-logging method, it is characterised in that：Step
Suddenly, in (8), adopted formula is H.N.Hall empirical equations：
Wherein, CfFor rock compressibility.
8. after acid fracturing according to claim 1 termination of pumping well logging mouth Pressure-drop instability well-logging method, it is characterised in that：Step
Suddenly, in (9), asking for for the strata pressure is the density or proportion by drilling fluid in pit shaft in drilling process, using formula P
=ρ × g × h tries to achieve the static pressure of fluid column, and h is the height of drilling process drilling fluid hydrostatic column, and wherein temperature is by block
What the formation temperature of offset well was tried to achieve.
9. after acid fracturing according to claim 1 termination of pumping well logging mouth Pressure-drop instability well-logging method, it is characterised in that：Step
Suddenly, in (11), the model set up is down pressure of water injection transient well test analysis or Numerical Well Test Analysis model.
10. after acid fracturing according to claim 1 termination of pumping well logging mouth Pressure-drop instability well-logging method, it is characterised in that：
In step (12), the parameters include entry listed by wellbore conditions, formation condition and/or boundary condition.
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| CN108166963A (en) * | 2017-12-13 | 2018-06-15 | 中国海洋石油集团有限公司 | A kind of offshore oil gas well evaluation of Fracturing Effect on Compact Sandstone method |
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| CN108468540A (en) * | 2018-03-29 | 2018-08-31 | 西南石油大学 | A kind of computational methods of hypotonic-special low permeability oil field individual well drainage area |
| CN109101703A (en) * | 2018-07-23 | 2018-12-28 | 中国石油集团川庆钻探工程有限公司 | Method based on well cementation big data subregion piecewise prediction wellbore temperatures |
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| CN110939438A (en) * | 2019-10-14 | 2020-03-31 | 中国石油化工股份有限公司 | Method for evaluating after-pressure by using pressure drop of main fracturing pump stopping |
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