CN107503739B - A kind of pressure monitoring method differentiating inflow direction for horizontal well - Google Patents
A kind of pressure monitoring method differentiating inflow direction for horizontal well Download PDFInfo
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Abstract
The present invention provides a kind of pressure monitoring methods that inflow direction is differentiated for horizontal well, comprising the following steps: level monitoring well bottom pressure delta data；Consider the variation of surrounding water injection well working system, designs the interference test between water injection well and horizontal well；Establish the Horizontal Well bottom pressure Plate Analysis under water injection well interference；Analysis is fitted to the bottom pressure data measured, the reservoir parameter under different injection well change water injection rate is obtained, the parameter being fitted under different injection well working system is compared by analysis, determines interwell communication situation, differentiates inflow direction.Of the invention is simple and easy to understand easily operated, due to considering the variation of water injection well water injection rate, therefore it can accurately differentiate horizontal well inflow direction, while carry out horizontal well monitoring pressure interpretation using this method and more tallying with the actual situation, improve the precision of pressure monitoring explanation.
Description
Technical field
The present invention relates to oil-gas mining field more particularly to the horizontal well production fields of LOW PERMEABILITY RESERVOIR.
Background technique
Straight well fills the water, the joint injection-production method of horizontal well production becomes a kind of universal phenomenon in the exploitation of LOW PERMEABILITY RESERVOIR,
Horizontal well production is successively decreased quickly under normal circumstances, once water breakthrough, moisture content is risen rapidly.Pass through Horizontal Well ground potential method, water
Horizontal well well test analysis method etc. can effectively determine the water yield of horizontal well.
In a flooding unit, a bite horizontal well corresponds to more mouthfuls of water injection wells, although the water yield of horizontal well can be determined,
But existing pressure analysis method cannot accurately differentiate these water from which mouthful water injection well.
Such as application No. is the Chinese patent of CN201621039603.3, provide a kind of determined level well water exit position with
The process pipe string of inflow direction, including oil pipe and casing, oil pipe end are equipped with guiding plug wire, each interval are corresponded on oil pipe in the past
Horizontal packer, centralizer and pressure gauge are successively arranged after, wherein set between the centralizer and pressure gauge of the last one interval
There is intelligent switch device, the cable connected with each interval pressure meter is equipped in oil pipe, the host computer connection on the cable and ground passes
Defeated each interval pressure counts.The patent is sealed each interval card according to oil well number of segment, using packer, each card envelope section tripping in pressure
Meter, underground segmentation acquisition in real time, judges well water position；By changing surrounding water injection well working system, each interval pressure is tested
Power situation of change identifies inflow direction.But above-mentioned patent only provides process pipe string, does not provide and differentiates the specific of inflow direction
Method, and conventional method is used, the existing interference effect that water injection well is not accounted for about the model and method of horizontal well, for
The feature fitting effect for producing the decline of later period observed pressure derivative curve is bad.
Summary of the invention
In order to overcome the problems of the prior art, the present invention by being filled the water in straight well, in the flooding pattern of horizontal well production,
The interference test of design level well and surrounding water injection well establishes a kind of novel pressure that inflow direction is differentiated for horizontal well
Monitoring method can determine interwell communication situation, differentiate inflow direction, adjusts water injection well working system for LOW PERMEABILITY RESERVOIR, mentions
High oil well output, has great importance.
The present invention solves technical solution used by aforementioned technical problem: a kind of to differentiate inflow direction for horizontal well
Pressure monitoring method, comprising the following steps:
1. level monitoring well bottom pressure delta data；
2. considering the variation of surrounding water injection well working system, the interference test between water injection well and horizontal well is designed；
3. establishing the Horizontal Well bottom pressure Plate Analysis under water injection well interference；
4. being fitted analysis to the bottom pressure data measured, obtains the reservoir that different injection well changes under water injection rate and join
Number compares the parameter being fitted under different injection well working system by analysis, determines interwell communication situation, differentiates water side
To.
Preferably, step 1. in, Horizontal Well bottom pressure delta data is measured by pressure gauge, pressure gauge tripping in position
It is set to horizontal well deflecting position.
Any of the above-described scheme is preferably, step 2. in, the variation of the water injection well working system specifically includes change water
The injection rate of water injection well around horizontal well.
Any of the above-described scheme is preferably, and the injection rate for changing water injection well around horizontal well includes making horizontal well with certain
One yield production changes the injection rate of certain a bite water injection well around it, keeps the injection rate of other water injection wells constant, measures level
The bottom pressure of well；Successively change the injection rate of other water injection wells around the horizontal well, while keeping the injection of other water injection wells
It measures constant, measures bottom pressure of the horizontal well under water injection well different operating system.The variation of injection rate is theoretically arbitrary,
Range is unlimited, and how much be after all situations of change suitable for actual production are initially how many and variation can be according to practical feelings
Depending on condition.
Any of the above-described scheme is preferably, step 3. in, further comprise according to well logging and complete well geologic information, be arranged mould
The initial parameter of type calculates bottom pressure with the changing value of production time, draws typical plate according to initial parameter.
Any of the above-described scheme is preferably, the initial parameter by being directly acquired in geologic information, including pay thickness,
Porosity, formation fluid viscosity, system compressibility, volume factor, well radius, horizontal well production, original formation pressure.Initially
The given of parameter can be provided according to oil reservoir real data, can also first use conventional horizontal well models fitting, using its result as just
Beginning parameter.
Any of the above-described scheme is preferably, and bottom pressure is dropped with changing value, that is, Horizontal Well bottom pressure of production time, packet
Bottom pressure caused by when including horizontal well production drops and as the pressure recovery caused by Horizontal Well bottom of water injection well water filling around.
Any of the above-described scheme is preferably, and using principle of stacking founding mathematical models, the bottom pressure is with the production time
Changing value meet following relationship,
Wherein,
Δ p --- bottom pressure is poor, atm；
pi--- original formation pressure, atm；
pwf--- bottom pressure, atm；
Kh--- horizontal permeability, D；
Kv--- vertical permeability, D；
φ --- porosity, decimal；
μ --- formation fluid viscosity, cP；
Ct--- system compressibility, atm-1；
η --- piezometric conductivity, Datm/cP；
B --- volume factor, zero dimension；
L --- horizontal well half is long, cm；
H --- core intersection, cm；
(xw,yw,zw) --- horizontal well heel end coordinate position；
qj--- the injection rate of j-th of water injection well, cm3/s；
(xj,yj,zj) --- the shaft bottom coordinate position of j-th of water injection well；
T --- time, s；
τ --- time variable, s.
Any of the above-described scheme is preferably, and the derivation process of the relational expression is
(1) pressure solution when horizontal well individually produces is sought
It introduces
Then horizontal well three dimensional fluid flow partial differential equation can turn to following canonical form:
Primary condition:
p(x,y,z,t)|T=0=pi
Boundary condition:
The instantaneous point source expression formula of above-mentioned model is obtained using Newman product method:
(2) pressure solution when water injection well water filling around is sought
The basis partial differential equation of every mouth water injection well are as follows:
M mouthfuls of water injection well strata pressures are acquired using instantaneous source solution and principle of stacking are as follows:
(3) Bottom Hole Pressure Solution of the horizontal well under water injection well interference is sought
Using principle of stacking, the bottom pressure of the horizontal well under water injection well interference is acquired are as follows:
In above-mentioned derivation process, instantaneous source solution specifically:
Instantaneous point source pressure formula:
Infinity plane line source pressure solution:
Infinity plane band source pressure solution:
Line source pressure solution in strip-form stratum:
Newman product method:
This method is used primarily for solving three-dimensional heat conduction problem, since heat conduction problem mathematically has with Seepage problems
Certain general character, Newman product method can also be applied to the instantaneous source function of multidimensional Seepage problems, i.e. a multidimensional oil reservoir can be seen
Two to three one-dimensional " oil reservoir " intersections or one-dimensional and two-dimentional oil reservoir intersection are done, multidimensional source function is multiple one-dimensional source letters
Several products.After intersection, several one-dimensional shared flow regions constitute a multidimensional flow region；Several one-dimensional shared sources
Remittance distributed area constitutes the distributed area Yuan Hui of a multidimensional；Boundary condition is then provided by the appropriately combined of one-dimensional boundary condition.
Any of the above-described scheme is preferably, 4. the step further comprises comparing and judging to survey bottom pressure at any time
Between variation it is whether equal with computational theory value, if actual measurement bottom pressure difference changes with time relationship and computational theory value phase
Deng then using initial parameter as the practical fitting parameter of horizontal well；If differing, fitting parameter is corrected, until the two is at one
Within acceptable error range, horizontal well actual reservoir parameter is obtained, and then determine interwell communication situation, differentiate water side
To.It is larger to be fitted obtained permeability, flow coefficient and piezometric conductivity, illustrates the infiltration that interwell communication situation is preferable, is fitted
The parameters such as saturating rate, flow coefficient and piezometric conductivity are smaller, illustrate that interwell communication situation is poor.The size of parameter value can reflect
Interwell communication situation；Inflow direction is differentiated by comparing the parameter size being fitted under different injection well working system.Example
Such as when changing the water injection rate of certain mouthful of well, by being fitted the parameters such as obtained permeability, flow coefficient and piezometric conductivity than changing
The result being fitted when the water injection rate of other wells is big, then the production water of the horizontal well can be differentiated mainly from the water injection well.
Any of the above-described scheme is preferably, step 4. in, the described pair of bottom pressure data measured are fitted analysis bag
It includes the Horizontal Well bottom pressure Plate Analysis 3. obtained using step and manual Fitting Analysis is carried out to the bottom pressure data measured
Or automatic Fitting analysis is carried out using computer programming.
Any of the above-described scheme is preferably, and the obtained parameter that is fitted includes reservoir permeability, piezometric conductivity, flowing system
Number, water yield, skin factor, well hole storage coefficient.
Of the invention is simple and easy to understand, easily operated, improves production efficiency.Due to considering water injection well water injection rate
Therefore variation can accurately differentiate horizontal well inflow direction using this method, while carrying out horizontal well monitoring using this method
Pressure interpretation more tallies with the actual situation, and improves the precision of pressure monitoring explanation, is that LOW PERMEABILITY RESERVOIR horizontal well and its surrounding are infused
The adjustment of well working system provides theoretical foundation.It is embodied in:
(1) a kind of pressure monitoring method that inflow direction is differentiated for horizontal well is proposed；
(2) variation for considering water injection well working system around, more meets reality；
(3) the problem of explaining production later period observed pressure derivative curve decline；It is existing about horizontal well at any time
Pressure change model and method do not account for the interference effect of water injection well, for production later period observed pressure derivative curve decline
Feature fitting effect is bad；And this method considers water injection well interference, the new method of proposition can carry out fine with measured data
Fitting, therefore can explain that production later period observed pressure derivative curve decline is interference effect due to water injection well.
(4) in the case where considering water injection well interference, existing technology cannot achieve horizontal well pressure and dynamically be fitted, this
The method of invention can be fitted horizontal well pressure dynamic, and theoretical curve and measured data approximation is enable to coincide together.
Detailed description of the invention
Fig. 1 is an a kind of preferred embodiment of pressure monitoring method that inflow direction is differentiated for horizontal well of the invention
Flow chart.
Fig. 2 is an a kind of preferred embodiment of pressure monitoring method that inflow direction is differentiated for horizontal well of the invention
Pressure gauge tripping in position view.
Fig. 3 is an a kind of preferred embodiment of pressure monitoring method that inflow direction is differentiated for horizontal well of the invention
Horizontal Well bottom pressure Plate Analysis under water injection well interference.
Fig. 4 is an a kind of preferred embodiment of pressure monitoring method that inflow direction is differentiated for horizontal well of the invention
Horizontal well test model (individual well) and measured data are fitted schematic diagram.
Fig. 5 is that the theoretical curve of embodiment illustrated in fig. 4 of the present invention calculated using the method for the present invention and measured data are fitted
Schematic diagram.
Specific embodiment
In order to be further understood that summary of the invention of the invention, the present invention is made below in conjunction with specific embodiment more detailed
Thin description, embodiment only has exemplary effect to the present invention, without the effect of any restrictions；Any this field skill
The insubstantial modifications that art personnel make on the basis of the present invention, all should belong to the scope of protection of the invention.
Embodiment 1
As shown in Figure 1, straight well water filling, horizontal well production flooding pattern in (such as Five-point method pattern, 7 method wells
Net), the present embodiment implements a kind of pressure monitoring method that inflow direction is differentiated for horizontal well, packet by taking Five-point method pattern as an example
Include following steps:
1. level monitoring well bottom pressure delta data；
2. considering the variation of surrounding water injection well working system, the interference test between water injection well and horizontal well is designed；
3. establishing the Horizontal Well bottom pressure Plate Analysis under water injection well interference；
4. being fitted analysis to the bottom pressure data measured, obtains the reservoir that different injection well changes under water injection rate and join
Number compares the parameter being fitted under different injection well working system by analysis, determines interwell communication situation, differentiates water side
To.
As shown in Fig. 2, in the present embodiment, step 1. in, Horizontal Well bottom pressure delta data is measured by pressure gauge, institute
Stating pressure gauge tripping in position is horizontal well deflecting position.
In the present embodiment, step 2. in, the variation of the water injection well working system specifically include change horizontal well around
The injection rate of water injection well.
In the present embodiment, the injection rate for changing water injection well around horizontal well includes keeping horizontal well raw with a certain yield
It produces, water injection well number A, B, C, D respectively, changes the injection rate of A water injection well around it, keep other B, C, D in Five-point method pattern
The injection rate of three mouthfuls of water injection wells is constant, measures the bottom pressure of horizontal well；Then successively change the injection rate of water injection well B, C, D,
It keeps the injection rate of other three mouthfuls of water injection wells constant simultaneously, measures shaft bottom pressure of the horizontal well under water injection well different operating system
Power.
In the present embodiment, step 3. in, further comprise according to well logging and complete well geologic information, the initial of model is set
Parameter calculates bottom pressure with the changing value of production time, draws typical plate according to initial parameter, as shown in figure 3, this
Plate in embodiment is, according to oil field actual conditions, to give some underlying parameter values first in Five-point method pattern, initial to join
Several giving can be provided according to oil reservoir real data, can also first use conventional horizontal well models fitting, using its result as initial
Then parameter changes four mouthfuls of water injection well water injection rates, public with the variation of production time using following bottom pressures in the present embodiment
Formula calculates theoretical bottom pressure and pressure derivative under 6 kinds of different injection amounts, is plotted in log-log coordinate system.
In the present embodiment, the initial parameter includes pay thickness, porosity, formation fluid viscosity, comprehensive compression system
Number, volume factor, well radius, horizontal well production, original formation pressure.
In the present embodiment, bottom pressure is dropped with changing value, that is, Horizontal Well bottom pressure of production time, including horizontal well
Bottom pressure caused by when production drops and as the pressure recovery caused by Horizontal Well bottom of water injection well water filling around.
In the present embodiment, using principle of stacking founding mathematical models, the bottom pressure with the production time changing value
Meet following relationship,
Wherein,
Δ p --- bottom pressure is poor, atm；
pi--- original formation pressure, atm；
pwf--- bottom pressure, atm；
Kh--- horizontal permeability, D；
Kv--- vertical permeability, D；
φ --- porosity, decimal；
μ --- formation fluid viscosity, cP；
Ct--- system compressibility, atm-1；
η --- piezometric conductivity, Datm/cP；
B --- volume factor, zero dimension；
L --- horizontal well half is long, cm；
H --- core intersection, cm；
(xw,yw,zw) --- horizontal well heel end coordinate position；
qj--- the injection rate of j-th of water injection well, cm3/s；
(xj,yj,zj) --- the shaft bottom coordinate position of j-th of water injection well；
T --- time, s；
τ --- time variable, s.
In the present embodiment, the derivation process of the relational expression is
(1) pressure solution when horizontal well individually produces is sought
It introduces
Then horizontal well three dimensional fluid flow partial differential equation can turn to following canonical form:
Primary condition:
p(x,y,z,t)|T=0=pi
Boundary condition:
The instantaneous point source expression formula of above-mentioned model is obtained using Newman product method:
(2) pressure solution when water injection well water filling around is sought
The basis partial differential equation of every mouth water injection well are as follows:
M mouthfuls of water injection well strata pressures are acquired using instantaneous source solution and principle of stacking are as follows:
(3) Bottom Hole Pressure Solution of the horizontal well under water injection well interference is sought
Using principle of stacking, the bottom pressure of the horizontal well under water injection well interference is acquired are as follows:
In the present embodiment, 4. the step further comprises comparing and judging that surveying bottom pressure changes with time
Whether equal with computational theory value, if actual measurement bottom pressure difference changes with time, relationship is equal with computational theory value, will be first
Practical fitting parameter of the beginning parameter as horizontal well；If differing, fitting parameter is corrected, until the two is in an acceptable mistake
Within the scope of difference, horizontal well actual reservoir parameter is obtained, and then determine interwell communication situation, differentiate inflow direction.Fitting obtains
Permeability, flow coefficient and piezometric conductivity it is larger, illustrate that interwell communication situation is preferable, the permeability that is fitted, flowing system
The parameters such as several and piezometric conductivity are smaller, illustrate that interwell communication situation is poor.The size of parameter value can reflect interwell communication feelings
Condition；Inflow direction is differentiated by comparing the parameter size being fitted under different injection well working system.Such as when change certain
When the water injection rate of mouth well, by being fitted note of the parameters such as obtained permeability, flow coefficient and piezometric conductivity than changing other wells
The result being fitted when water is big, then the production water of the horizontal well can be differentiated mainly from the water injection well.
In the present embodiment, step 4. in, the described pair of bottom pressure data measured be fitted analysis including the use of step
Suddenly the Horizontal Well bottom pressure Plate Analysis 3. obtained carries out manual Fitting Analysis or use to the bottom pressure data measured
Computer programming carries out automatic Fitting analysis.
In the present embodiment, the obtained parameter that is fitted includes reservoir permeability, piezometric conductivity, flow coefficient, water outlet
Amount, skin factor, well hole storage coefficient.
In the present embodiment, when changing the water injection rate of well A, by being fitted the parameters ratios such as obtained permeability, piezometric conductivity
The result being fitted when changing the water injection rate of other wells is big, then the production water of the horizontal well can be differentiated mainly from water injection well A.
Of the invention is simple and easy to understand, easily operated, improves production efficiency.Due to considering water injection well water injection rate
Therefore variation can accurately differentiate horizontal well inflow direction using this method, while carrying out horizontal well monitoring using this method
Pressure interpretation more tallies with the actual situation, and improves the precision of pressure monitoring explanation, is that LOW PERMEABILITY RESERVOIR horizontal well and its surrounding are infused
The adjustment of well working system provides theoretical foundation.
Embodiment 2
The present embodiment preferably certain oil field a bite horizontal well, the horizontal well go into operation initial stage Liquid output as 15m3/d.The horizontal well
Surrounding has 6 mouthfuls of water injection wells, respectively number water injection well 1, water injection well 2, water injection well 3, water injection well 4, water injection well 5, water injection well 6, note
Water is respectively 15,20,25,15,20,30m3It is respectively 445,460,457,468,455,450m at a distance from/d, with horizontal well.
The pressure monitoring method that inflow direction is differentiated for horizontal well in the present embodiment, comprising the following steps:
1. level monitoring well bottom pressure delta data；
2. considering the variation of surrounding water injection well working system, the interference test between water injection well and horizontal well is designed；
3. establishing the Horizontal Well bottom pressure Plate Analysis under water injection well interference；
4. being fitted analysis to the bottom pressure data measured, obtains the reservoir that different injection well changes under water injection rate and join
Number compares the parameter being fitted under different injection well working system by analysis, determines interwell communication situation, differentiates water side
To.
According to the method described above, firstly, by pressure gauge tripping in horizontal well deflecting position, when real-time monitoring horizontal well opening well and making production
Bottom pressure changing value.It records the horizontal well under different injection well working system and surveys pressure data, the shaft bottom of (or conversion) will be measured
Pressure difference and time and bottom pressure difference and the derivative curve of time are plotted under log-log coordinate system.
Secondly, giving an initial parameter value, calculated using following formula:
Wherein,
Δ p --- bottom pressure is poor, atm；
pi--- original formation pressure, atm；
pwf--- bottom pressure, atm；
Kh--- horizontal permeability, D；
Kv--- vertical permeability, D；
φ --- porosity, decimal；
μ --- formation fluid viscosity, cP；
Ct--- system compressibility, atm-1；
η --- piezometric conductivity, Datm/cP；
B --- volume factor, zero dimension；
L --- horizontal well half is long, cm；
H --- core intersection, cm；
(xw,yw,zw) --- horizontal well heel end coordinate position；
qj--- the injection rate of j-th of water injection well, cm3/s；
(xj,yj,zj) --- the shaft bottom coordinate position of j-th of water injection well；
T --- time, s；
τ --- time variable, s.
It is calculated using above-mentioned formula, obtains the pressure and pressure derivative plate under log-log coordinate system.The present embodiment
In horizontal well master data it is as shown in table 1.
Certain the fine and close oil field a bite horizontal well underlying parameter of table 1
Then, the difference compared between theoretical value and actual test value illustrates preset parameter value if the two essentially coincides
Rationally；If the two gap is larger, given initial value need to be continued, constantly adjusted, until the two is within reasonable error range.?
Under above-mentioned water injection well water injection rate, measured data and the theoretical curve of horizontal well single-well test model are fitted first, such as Fig. 4
Shown, curve matching effect is poor, and the later stage derivative decline stage is not fitted.Then by side in measured data and this patent
The theoretical curve that method calculates is fitted, as shown in figure 5, curve matching is fine, fitting result are as follows: well stores up coefficient C=1.08m3/
MPa, skin factor S=0.35, effective length 95.6m, horizontal permeability Kb=5.63 × 10-3μm2, flow coefficientPiezometric conductivity η=3221.74 × 10-8μm2·MPa/(mPa·s)。
Finally, differentiating inflow direction.It is real to the water injection rate of 6 mouthfuls of water injection wells around it for the inflow direction for differentiating horizontal well
Dynamic is applied to adjust.Adjustment mode are as follows: successively change 6 mouthfuls of wells water injection rate (while certain mouthful of well water injection rate changes, other 5 mouthfuls
The water injection rate that well keeps original is constant), the daily water-injection rate of every mouthful of water injection well all increases 10m on the basis of the original3.Measure level
Bottom pressure of the well under 6 kinds of different injection well working systems, the measured data under 6 kinds of situations is intended with theoretical curve
It closes, obtains explaining parameter, as shown in table 2.
Fitting parameter result under 26 kinds of water injection well working systems of table
From Table 2, it can be seen that when changing the water injection rate of water injection well 1 and water injection well 5, the permeability that is fitted, flowing
Coefficient and piezometric conductivity are larger, it is possible to judge that the production water of this horizontal well is mainly derived from water injection well 1 and water injection well 5.
Although the present invention has shown and described referring particularly to its preferred embodiment, those skilled in the art can be with
Understand, various changes in form and details can be made without departing from model of the invention described in the appended claims
It encloses.It is described in detail above in conjunction with specific embodiments of the present invention, but is not limitation of the present invention.It is all according to this hair
Any simple modification made to the above embodiment of bright technical spirit, still falls within the range of technical solution of the present invention.
Claims (9)
1. a kind of pressure monitoring method for differentiating inflow direction for horizontal well, comprising the following steps:
1. level monitoring well bottom pressure delta data；
2. considering the variation of surrounding water injection well working system, the interference test between water injection well and horizontal well is designed；
3. establishing the Horizontal Well bottom pressure Plate Analysis under water injection well interference；
4. being fitted analysis to the bottom pressure data measured, the reservoir parameter under different injection well change water injection rate is obtained,
Compare the parameter being fitted under different injection well working system by analysis, determine interwell communication situation, differentiates inflow direction；
Step 3. in, further comprise that the initial parameter of model is arranged according to well logging and complete well geologic information, according to initial ginseng
Number calculates bottom pressure with the changing value of production time, draws typical plate, bottom pressure is with the changing value of production time
Horizontal Well bottom pressure drop, including when horizontal well produces caused by bottom pressure drop and since the water filling of around water injection well is in horizontal well
Pressure recovery caused by shaft bottom；
Using principle of stacking founding mathematical models, the bottom pressure meets following relationship with the changing value of production time,
Wherein,
Δ p --- bottom pressure is poor, atm；
pi--- original formation pressure, atm；
pwf--- bottom pressure, atm；
Kh--- horizontal permeability, D；
Kv--- vertical permeability, D；
φ --- porosity, decimal；
μ --- formation fluid viscosity, cP；
Ct--- system compressibility, atm-1；
η --- piezometric conductivity, Datm/cP；
B --- volume factor, zero dimension；
L --- horizontal well length, cm；
H --- core intersection, cm；
(xw,yw,zw) --- horizontal well heel end coordinate position；
qj--- the injection rate of j-th of water injection well, cm3/s；
(xj,yj,zj) --- the shaft bottom coordinate position of j-th of water injection well；
T --- time, s；
τ --- time variable, s.
2. the pressure monitoring method according to claim 1 for differentiating inflow direction for horizontal well, it is characterised in that: step
1. in, Horizontal Well bottom pressure delta data is measured by pressure gauge, and pressure gauge tripping in position is horizontal well deflecting position.
3. the pressure monitoring method according to claim 1 for differentiating inflow direction for horizontal well, it is characterised in that: step
2. in, the variation of the water injection well working system specifically includes the injection rate for changing water injection well around horizontal well.
4. the pressure monitoring method according to claim 3 for differentiating inflow direction for horizontal well, it is characterised in that: described
The injection rate for changing water injection well around horizontal well includes making horizontal well with a certain yield production, changes certain a bite water injection well around it
Injection rate, keep the injection rate of other water injection wells constant, measure the bottom pressure of horizontal well；Successively change around the horizontal well
The injection rate of other water injection wells, while keeping the injection rate of other water injection wells constant, horizontal well is measured in water injection well different operating
Bottom pressure under system.
5. the pressure monitoring method according to claim 1 for differentiating inflow direction for horizontal well, it is characterised in that: described
Initial parameter by being directly acquired in geologic information, including pay thickness, porosity, formation fluid viscosity, system compressibility,
Volume factor, well radius, horizontal well production, original formation pressure.
6. the pressure monitoring method according to claim 1 for differentiating inflow direction for horizontal well, it is characterised in that: described
The derivation process of relational expression is
(1) pressure solution when horizontal well individually produces is sought
It introduces
Then horizontal well three dimensional fluid flow partial differential equation can turn to following canonical form:
Primary condition:
p(x,y,z,t)|T=0=pi
Boundary condition:
The instantaneous point source expression formula of above-mentioned model is obtained using Newman product method:
(2) pressure solution when water injection well water filling around is sought
The basis partial differential equation of every mouth water injection well are as follows:
M mouthfuls of water injection well strata pressures are acquired using instantaneous source solution and principle of stacking are as follows:
(3) Bottom Hole Pressure Solution of the horizontal well under water injection well interference is sought
Using principle of stacking, the bottom pressure of the horizontal well under water injection well interference is acquired are as follows:
7. the pressure monitoring method according to claim 1 for differentiating inflow direction for horizontal well, it is characterised in that: described
4. step further comprises comparing and judging whether actual measurement bottom pressure changes with time equal with computational theory value, if real
The well logging bottom pressure difference relationship that changes with time is equal with computational theory value, then using initial parameter as the practical fitting of horizontal well
Parameter；If differing, fitting parameter is corrected, until the two within an acceptable error range, obtains horizontal well reality
Reservoir parameter, and then determine interwell communication situation, differentiate inflow direction.
8. the pressure monitoring method according to claim 1 for differentiating inflow direction for horizontal well, it is characterised in that: step
4. in, the described pair of bottom pressure data measured are fitted 3. Horizontal Well bottom pressure point that analysis is obtained including the use of step
Analysis plate carries out manual Fitting Analysis to the bottom pressure data measured or carries out automatic Fitting analysis using computer programming.
9. the pressure monitoring method according to claim 8 for differentiating inflow direction for horizontal well, it is characterised in that: described
Being fitted obtained parameter includes reservoir permeability, piezometric conductivity, flow coefficient, water yield, skin factor, well hole storage coefficient.
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| CN111178785B (en) * | 2020-01-06 | 2023-01-24 | 中国海洋石油集团有限公司 | Horizontal well variable flow oil-water two-phase pressure dynamic evaluation method under drainage well pattern |
| CN112906178B (en) * | 2020-06-22 | 2022-08-30 | 中国海洋石油集团有限公司 | Method for calculating pressure field of horizontal water injection well by using point source function |
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