CN104500054B - The determination method and device of formation pore pressure - Google Patents
The determination method and device of formation pore pressure Download PDFInfo
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- CN104500054B CN104500054B CN201410778684.8A CN201410778684A CN104500054B CN 104500054 B CN104500054 B CN 104500054B CN 201410778684 A CN201410778684 A CN 201410778684A CN 104500054 B CN104500054 B CN 104500054B
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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
- E21B49/005—Testing the nature of borehole walls or the formation by using drilling mud or cutting data
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Abstract
A kind of determination method and device of formation pore pressure is the embodiment of the invention provides, wherein, the method includes：The mud flow rate parameter of Real-time Collection mud pump inlet, the mud flow rate parameter of back pressure pump intake and drilling fluid return flow；Mud flow rate parameter, the mud flow rate parameter of the back pressure pump intake and the drilling fluid return flow according to the mud pump inlet for gathering, calculate down-hole drilling fluids inlet flow rate and return the magnitude relationship between outflow；According to down-hole drilling fluids inlet flow rate and the magnitude relationship and formation condition information between outflow are returned, the difference of formation pore pressure and shaft bottom drilling well liquid columnpressure is calculated in real time；According to the formation pore pressure and the difference and known shaft bottom drilling well head of liquid of shaft bottom drilling well liquid columnpressure, formation pore pressure is calculated in real time.The program can improve the degree of accuracy of formation pore pressure result of calculation.
Description
Technical field
The present invention relates to oil, gas drilling technical field, the determination method of more particularly to a kind of formation pore pressure
And device.
Background technology
Formation pore pressure refers to oil, the pressure of gas and water in formation pore, relevant with depth where stratum, general performance
For the liquid column hydrostatic pressure that stratum connects with earth's surface.Additionally, sealing condition of the formation pore pressure also with construction is relevant, dome structure
Top influenceed by overlying surface layer pressure, abnormal pressure stratum can be formed.Formation pore pressure is for petroleum works
It is an important engineering geology parameters, probing and exploitation with petroleum resources suffer from substantial connection.Formation pore pressure is
It is determined that the basic basis of reasonable drilling fluid density, and drilling fluid density directly affects drilling engineering safety and efficiency, be to realize
Balanced drilling and the key parameter of under balance pressure drilling.So accurately being calculated formation pore pressure and analysis contributes to excellent
Change Drilling Design, ensure drilling safety, improve drilling efficiency.
The measurement evaluation method of current formation pore pressure can be divided three classes according to the sequencing of drilling process：It is pre- before boring
Detected after survey, measurement while drilling, brill.Wherein, prediction before drilling is mainly by seismic data to predict formation pore pressure, but typically
Precision is relatively low, it is impossible to real reflection formation pore pressure information；Detection is to detect formation pore using well-log information after brill
Pressure, detects that accuracy is higher after brill, be current most accurate pore pressure evaluation method, but detection belongs to and detects afterwards after boring
Construction guidance cannot be provided to the drilling engineering for carrying out in real time；Measurement while drilling is using the well logging money gathered in drilling process
Material and the change of well logging data real-time detection formation pore pressure, detect, its advantage is energy compared to prediction before drilling and after boring
It is enough to find formation pore pressure change in time, redjustment and modification drilling fluid density and well structure design are and guided, therefore be stratum
Pore pressure determines the Main Trends of The Development of technology.
Conventional formation pore pressure measuring while drilling method mainly has d at presentcIndex method, mud shale densimetry, standard are bored
Fast method, rock strength method etc..Wherein again with dcThe most extensive, the d of index method applicationcIndex method is that a form of standardization is bored
Fast method, is characterized in easy to use, can in time provide PRESSURE DATA, while certain precision can be ensured.Its principle is to utilize
The influence of mud shale Compaction Law and bottom hole pressure difference to rate of penetration calculates formation pore pressure.Specific method is as follows：First
To collect data (every meter of the pressure of the drill of well depth, rotating speed, when boring, mud balance, bit diameter, normal strata pressure equivalent mud
Slurry proportion) substitute into formula (1), the dc exponent datas on the normal pressure stratum according to a bite well, onset index normal trend line.
Wherein, N is rotating speed, r/m；When T is to bore, min/m；W is the pressure of the drill, KN；D is drill bit straight well, mm；ρnIt is normal stratum
Pore pressure grad equivalent density, g/cm3；ρmIt is drilling fluid density, g/cm3。
After setting up normal trend line, the d of corresponding well depth is tried to achievecValue, by itself and the actual d for calculatingcValue compares, and uses
Corresponding formation pore pressure computation model (for example, logarithm method, equivalent depth method, anti-inference method, method of Eaton), quantitatively to calculate
Go out the size of formation pore pressure.
Although dcIndex method is widely used, but still there is limitation.dcIndex method assumes drilling well bar during shifting onto
Part and lithology are constant, while the influence of bit factor and hydraulic factors is not considered yet, at the influence factor of rate of penetration
Reason is excessively idealized, but in fact these factors can have large effect to the result of calculation of formation pore pressure really, make
The result of calculation degree of accuracy for obtaining formation pore pressure is low.
The content of the invention
A kind of determination method of formation pore pressure is the embodiment of the invention provides, knot is calculated to improve formation pore pressure
The degree of accuracy of fruit.The method includes：The mud flow rate parameter of Real-time Collection mud pump inlet, the drilling fluid stream of back pressure pump intake
Amount parameter and drilling fluid return flow；The mud flow rate parameter of the mud pump inlet according to collection, the back pressure are pumped into
Mouthful mud flow rate parameter and the drilling fluid return flow, calculate down-hole drilling fluids inlet flow rate and return between outflow
Magnitude relationship；According to down-hole drilling fluids inlet flow rate and the magnitude relationship and formation condition information between outflow are returned, in real time meter
Calculate the difference of formation pore pressure and shaft bottom drilling well liquid columnpressure；According to the formation pore pressure and shaft bottom drilling fluid column
The difference of pressure and known shaft bottom drilling well head of liquid, calculate formation pore pressure in real time.
In one embodiment, according to the formation pore pressure and shaft bottom drilling well liquid columnpressure difference and described known
Shaft bottom drilling well head of liquid, formation pore pressure is calculated in real time, including：When drilling fluid inlet flow rate is returned equal to drilling fluid
During outflow, formation pore pressure is calculated by below equation：
PP=PBHP=PAF+P1
Wherein, PPIt is formation pore pressure, PBHPIt is shaft bottom drilling well liquid columnpressure, P1It is liquid column hydrostatic pressure, PAFIt is annular space
Frictional resistance.
In one embodiment, according to the formation pore pressure and shaft bottom drilling well liquid columnpressure difference and described known
Shaft bottom drilling well head of liquid, formation pore pressure is calculated in real time, including：When drilling fluid inlet flow rate is returned less than drilling fluid
During outflow, formation pore pressure is calculated by below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, PPIt is formation pore pressure, q is formation fluid flow velocity, and K is stratum
Porosity, S is skin factor, and t is time of measuring interval after overflow occurs, and h is formation thickness, and φ is formation porosity, and c is ground
Layer fluid compressibility, rwIt is drilling well radius, γ is Euler's constant, and μ is fluid viscosity, and e is constant.
In one embodiment, according to the formation pore pressure and shaft bottom drilling well liquid columnpressure difference and described known
Shaft bottom drilling well head of liquid, formation pore pressure is calculated in real time, including：When drilling fluid inlet flow rate is returned more than drilling fluid
During outflow, formation pore pressure is calculated by below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, PPIt is formation pore pressure, Q is wastage, and K permeates for stratum
Rate, h is formation thickness, and B is water volume coefficient, and μ is fluid viscosity, reIt is drainage radius, rwIt is drilling well radius, s is skin effect
Coefficient.
In one embodiment, also include：After calculating formation pore pressure in real time, from the formation pore for calculating
Remove in pressure data more than the first preset value or the numerical value less than the second arranges value, first preset value is more than described second
Arranges value.
In one embodiment, also include：After being calculated formation pore pressure in real time, according to the earth bore for calculating
Gap pressure calculates formation fracture pressure in real time.
The embodiment of the present invention additionally provides a kind of determining device of formation pore pressure, to improve formation pore pressure calculating
The degree of accuracy of result.The device includes：Acquisition module, for mud flow rate parameter, the back pressure of Real-time Collection mud pump inlet
The mud flow rate parameter and drilling fluid return flow of pump intake；Magnitude relationship computing module, for the mud according to collection
The mud flow rate parameter of stock pump entrance, the mud flow rate parameter of the back pressure pump intake and the drilling fluid return flow,
Calculate down-hole drilling fluids inlet flow rate and return the magnitude relationship between outflow；Pressure differential computing module, for being bored according to underground
Well liquid inlet flow rate and the magnitude relationship and formation condition information between outflow are returned, formation pore pressure and well are calculated in real time
The difference of bottom drilling well liquid columnpressure；Formation pore pressure computing module, for according to the formation pore pressure and shaft bottom drilling well
The difference of liquid head of liquid and known shaft bottom drilling well head of liquid, calculate formation pore pressure in real time.
In one embodiment, when drilling fluid inlet flow rate is equal to drilling fluid return flow, the formation pore pressure
Computing module calculates formation pore pressure by below equation：
PP=PBHP=PAF+P1
Wherein, PPIt is formation pore pressure, PBHPIt is shaft bottom drilling well liquid columnpressure, P1It is liquid column hydrostatic pressure, PAFIt is annular space
Frictional resistance.
In one embodiment, when drilling fluid inlet flow rate is less than drilling fluid return flow, the formation pore pressure
Computing module calculates formation pore pressure by below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, PPIt is formation pore pressure, q is formation fluid flow velocity, and K is stratum
Porosity, S is skin factor, and t is time of measuring interval after overflow occurs, and h is formation thickness, and φ is formation porosity, and c is ground
Layer fluid compressibility, rwIt is drilling well radius, γ is Euler's constant, and μ is fluid viscosity, and e is constant.
In one embodiment, when drilling fluid inlet flow rate is more than drilling fluid return flow, the formation pore pressure
Computing module calculates formation pore pressure by below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, PPIt is formation pore pressure, Q is wastage, and K permeates for stratum
Rate, h is formation thickness, and B is water volume coefficient, and μ is fluid viscosity, reIt is drainage radius, rwIt is drilling well radius, s is skin effect
Coefficient.
In one embodiment, also include：Screening module, after calculating formation pore pressure in real time, from calculating
Remove in the formation pore pressure data for drawing more than the first preset value or the numerical value less than the second arranges value, described first presets
Value is more than second arranges value.
In one embodiment, also include：Formation fracture pressure computing module, for being calculated formation pore pressure in real time
After power, formation fracture pressure is calculated according to the formation pore pressure for calculating in real time.
In embodiments of the present invention, by gathering the drilling well of the mud flow rate parameter, back pressure pump intake of mud pump inlet
Flow quantity parameter and drilling fluid return flow come the magnitude relationship between determining down-hole drilling fluids inlet flow rate and returning outflow,
And according to down-hole drilling fluids inlet flow rate and return magnitude relationship and formation condition information between outflow and calculate stratum in real time
The difference of pore pressure and shaft bottom drilling well liquid columnpressure, finally, according to formation pore pressure and shaft bottom drilling well liquid columnpressure it
Difference and known shaft bottom drilling well head of liquid, calculate formation pore pressure in real time.Pass through down-hole drilling fluids inlet flow rate
The difference of formation pore pressure and shaft bottom drilling well liquid columnpressure is derived with the magnitude relationship between outflow is returned, and then is drawn
Formation pore pressure, with the prior art pass through dcIndex method compared determining formation pore pressure, it is to avoid drilling condition, rock
Property the factor such as change calculate stratum pore pressure cell the influence of result, and shaft bottom drilling fluid column is calculated by hydraulic formula
Pressure, it is contemplated that the influence of the factor such as bite type and bit wear and hydraulics, such that it is able to improve formation pore pressure meter
Calculate the degree of accuracy of result.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, not
Constitute limitation of the invention.In the accompanying drawings：
Fig. 1 is a kind of flow chart of the determination method of formation pore pressure provided in an embodiment of the present invention；
Fig. 2 is a kind of structured flowchart of the determining device of formation pore pressure provided in an embodiment of the present invention.
Specific embodiment
It is right with reference to implementation method and accompanying drawing to make the object, technical solutions and advantages of the present invention become more apparent
The present invention is described in further details.Here, exemplary embodiment of the invention and its illustrating for explaining the present invention, but simultaneously
It is not as a limitation of the invention.
Inventor find, in drilling process, drilling fluid is pumped into well by slush pump, by drill string, annular space, liquid qi leel from
Device, vibratory sieve, return to mud pit, assume that drilling fluid is incompressible liquid during this, and gateway mud flow rate should be abided by
Keep conservation of mass principle；If gateway flow produces deviation, prove to there is flowing between formation fluid and downhole well fluid.
Regardless of whether the flowing for being formation fluid or downhole well fluid is all by drilling well liquid columnpressure and formation pore pressure in pit shaft
Difference drive.It is assumed that underground overflow occurs at nearly drill bit with leakage, flowed by the gateway of accurate measurement drilling fluid
Amount is poor, and the difference of drilling well liquid columnpressure and formation pore pressure is just inversely derived using seepage flow formula, then by hydraulics
Formula calculates drilling well liquid columnpressure in pit shaft, you can obtain formation pore pressure, therefore, inventor proposes to be based on drilling fluid
Gateway difference in flow come the method that determines formation pore pressure, and be based on d in the prior artcIndex method is compared, to improve ground
Layer pore pressure calculates the degree of accuracy of result.
Based on this, in embodiments of the present invention, there is provided a kind of determination method of formation pore pressure, as shown in figure 1, should
Method includes：
Step 101：The mud flow rate parameter of Real-time Collection mud pump inlet, the mud flow rate parameter of back pressure pump intake
And drilling fluid return flow；
Step 102：The drilling well of the mud flow rate parameter, the back pressure pump intake of the mud pump inlet according to collection
Flow quantity parameter and the drilling fluid return flow, the size for calculating down-hole drilling fluids inlet flow rate and returning between outflow are closed
System；
Step 103：According to down-hole drilling fluids inlet flow rate and the magnitude relationship and formation condition information between outflow are returned,
The difference of formation pore pressure and shaft bottom drilling well liquid columnpressure is calculated in real time；
Step 104：According to the difference and known shaft bottom drilling well of the formation pore pressure and shaft bottom drilling well liquid columnpressure
Head of liquid, calculates formation pore pressure in real time.
Flow as shown in Figure 1 is understood, in embodiments of the present invention, is joined by the mud flow rate for gathering mud pump inlet
Number, the mud flow rate parameter of back pressure pump intake and drilling fluid return flow determine down-hole drilling fluids inlet flow rate and return out
Magnitude relationship between flow, and according to down-hole drilling fluids inlet flow rate and return the magnitude relationship and formation condition between outflow
Information calculates the difference of formation pore pressure and shaft bottom drilling well liquid columnpressure in real time, finally, according to formation pore pressure and well
The difference of bottom drilling well liquid columnpressure and known shaft bottom drilling well liquid columnpressure, calculate formation pore pressure in real time.Lead to
Cross down-hole drilling fluids inlet flow rate and return the magnitude relationship between outflow and derive formation pore pressure and shaft bottom drilling fluid liquid
The difference of column pressure, and then draw formation pore pressure, and passes through d in the prior artcIndex method determines formation pore pressure phase
Than, it is to avoid the factor such as drilling condition, variation of lithological calculates stratum pore pressure cell the influence of result, and by hydraulic formula
To calculate shaft bottom drilling well liquid columnpressure, it is contemplated that the influence of the factor such as bite type and bit wear and hydraulics, so that can
To improve the degree of accuracy of formation pore pressure result of calculation.
During specific implementation, mud flow rate parameter, the backpressure pump of mud pump inlet can be at a time interval gathered
The mud flow rate parameter and drilling fluid return flow of entrance, and then determine that drilling fluid pumps into and return the situation of output, between the time
Every optional：Δ t=t2-t1=1min~10min.
In specific implementation process, can in the following manner come according to down-hole drilling fluids inlet flow rate and return between outflow
Magnitude relationship, determine formation pore pressure, for example：
When drilling fluid inlet flow rate is equal to drilling fluid return flow, then it is considered that formation pore pressure and shaft bottom drilling well
The difference of liquid head of liquid is zero, and formation pore pressure is equal to shaft bottom drilling well liquid columnpressure, specifically, can be according to below equation
To calculate formation pore pressure：
PP=PBHP=PAF+P1 (2)
Wherein, PPIt is formation pore pressure, PBHPIt is shaft bottom drilling well liquid columnpressure, the shaft bottom drilling well liquid columnpressure can
Tried to achieve with according to hydraulic formula, P1It is liquid column hydrostatic pressure, PAFIt is annular space frictional resistance,
ρESDIt is Equivalent Static drilling fluid density, unit g/cm3, drilling fluid Static Density is not identical everywhere in pit shaft, but with temperature
Degree, pressure have certain relation, therefore consider that pressure, temperature, with the pit shaft regularity of distribution, obtain the equal yield density of drilling fluid to count
Calculation can improve computational accuracy, ρgIt is annular pressure lost, unit：g/cm3, annular pressure lost need to be liquid-tight according to site specific such as drilling well
The suitable stream of the factors such as degree, drilling fluid rheology, drilling well pumpage, concentration of cuttings, temperature, borehole size and BHA selection
Varying model is calculated；G is acceleration of gravity, is 9.8N/kg；H is well depth.
When drilling fluid inlet flow rate is less than drilling fluid return flow, then provably layer fluid is flowed into pit shaft, be there occurs
Overflow.In this case, it is believed that be under balance pressure drilling, then may be referred to the formation fluid rate of outflow and ground during under balance pressure drilling
The relation of the difference of layer pore pressure and shaft bottom drilling well liquid columnpressure calculates formation pore pressure and shaft bottom drilling fluid column pressure
The difference of power, and then formation pore pressure is calculated, specifically, formation pore pressure can be determined according to below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, unit M Pa；PPIt is formation pore pressure, unit M Pa；Q is ground
Layer fluid flow velocity, K is formation pore rate, and S is skin factor, and t is time of measuring interval after overflow occurs, and h is formation thickness, φ
It is formation porosity, c is formation fluid compressibility, rwIt is drilling well radius, γ is Euler's constant, such as γ=0.57721, μ
It is fluid viscosity, units MPa s；E is constant, typically about 2.71828, it is an Infinite Cyclic number.
When drilling fluid inlet flow rate is more than drilling fluid return flow, then prove that having downhole well fluid to be flowed into stratum works as
In, there occurs leakage.This process is identical with oil field development the injecting process, because the drilling process time is relatively short, can assert
It is stationary flow, by the special relation for deriving pressure difference and wastage and leak-off velocity in leakage of Darcy formula, is surveyed by measurement device
Amount leak-off velocity and wastage, it is then anti-to release the difference of formation pore pressure and shaft bottom drilling well liquid columnpressure, and then calculate
Formation pore pressure, specifically, formation pore pressure can be determined according to below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, unit M Pa；PPIt is formation pore pressure, unit M Pa；Q is leakage
Vector, unit m3/h；K is in-place permeability, unit m D；H is formation thickness, m；B is water volume coefficient；μ is fluid viscosity,
Unit M Pas；reIt is drainage radius, unit m；rwIt is drilling well radius, unit m；S is skin effect coefficient.
During specific implementation, in order to further improve the precision of formation pore pressure result of calculation, in the present embodiment, in real time
After calculating formation pore pressure, remove from the formation pore pressure data for calculating more than the first preset value or be less than
The numerical value of the second arranges value, first preset value is more than second arranges value, for example, the first preset value can be 2, second
Arranges value can be 1, be screened with to the formation pore pressure being calculated so that formation pore pressure result of calculation is more accurate
Really.
During specific implementation, after formation pore pressure is calculated, can also be according to the formation pore pressure for calculating
Formation fracture pressure is calculated in real time, for example, the formation fracture pressure of different leakages is as follows with formation pore pressure relation：
(1) pressure break leakage, the leakage pressure of pressure break leakage is believed that and is approximately equal to fracture pressure.Completely stratum is broken
Split pressure is pit shaft circumferential stress and Tensile Strength of Rock sum.According to Linear elastic mechanics are theoretical and plane strain is it is assumed that can be with
The fracture pressure for obtaining well is：
pf=3 δh-δH+St-αPP (5)
Wherein, pfIt is fracture pressure；δHIt is the main crustal stress of maximum horizontal；δhIt is the main crustal stress of minimum level；α is effective stress system
Number；PPIt is formation pore pressure, unit M Pa；StIt is Tensile Strength of Rock, unit M Pa.
(2) crack autgmentability leakage, crack autgmentability leakage occurs mainly in strong stress sensitivity stratum, expands for crack
Malleability is missed, and there is critical crack width.When more than critical crack width, wellbore liquid leaching loss speed substantially increases, and then
Develop into drilling fluid leakage.By means such as classical force theory or numerical simulations, it is possible to try to achieve pit shaft head of liquid and split
The relation of the effective normal stress in seam face.
Wherein, Pf2It is fracture pressure；ωcIt is critical crack width, unit：mm；ωoIt is initial maximum fracture width, it is single
Position：mm；KnIt is crack rigidity；PpIt is formation pore pressure, unit：M Pa；E is coefficient, can be true according to specific formation lithology condition
It is fixed；V is coefficient, can be determined according to specific formation lithology condition.
(3) large-scale crack cave leakage, for large-scale crack solution cavity stratum, leakage channel size is larger, drilling fluid
Stratum is easily entered, missing need only overcome flow resistance of the drilling fluid in seam_cavern type, therefore the leakage pressure of such leakage
Power is：
pf3=pp+ps (7)
Wherein, pf3It is leakage pressure, ppIt is formation pore pressure, unit M Pa；psIt is the pressure loss of drilling fluid leakage,
Unit M Pa.
Based on same inventive concept, a kind of determining device of formation pore pressure is additionally provided in the embodiment of the present invention, such as
Described in the following examples.Due to the determination of the principle and formation pore pressure of the determining device solve problem of formation pore pressure
Method is similar, thus the determining device of formation pore pressure implementation may refer to formation pore pressure determination method reality
Apply, repeat part and repeat no more.Used below, term " unit " or " module " can realize the software of predetermined function
And/or the combination of hardware.Although the device described by following examples is preferably realized with software, hardware, or soft
The realization of the combination of part and hardware is also that may and be contemplated.
Fig. 2 is a kind of structured flowchart of the determining device of the formation pore pressure of the embodiment of the present invention, as shown in Fig. 2 bag
Include：Acquisition module 201, magnitude relationship computing module 202, pressure differential computing module 203 and formation pore pressure computing module
204.The structure is illustrated below.
Acquisition module 201, the drilling fluid of mud flow rate parameter, back pressure pump intake for Real-time Collection mud pump inlet
Flow parameter and drilling fluid return flow；
Magnitude relationship computing module 202, is connected with acquisition module 201, for the mud pump inlet according to collection
Mud flow rate parameter, the mud flow rate parameter of the back pressure pump intake and the drilling fluid return flow, calculate underground and bore
Well liquid inlet flow rate and return the magnitude relationship between outflow；
Pressure differential computing module 203, is connected with magnitude relationship computing module 202, for according to down-hole drilling fluids entrance stream
The magnitude relationship and formation condition information between outflow are measured and returned, formation pore pressure and shaft bottom drilling fluid liquid are calculated in real time
The difference of column pressure；
Formation pore pressure computing module 204, is connected with pressure differential computing module 203, for according to the formation pore
The difference and known shaft bottom drilling well head of liquid of pressure and shaft bottom drilling well liquid columnpressure, calculate formation pore pressure in real time
Power.
In one embodiment, when drilling fluid inlet flow rate is equal to drilling fluid return flow, the formation pore pressure
Computing module calculates formation pore pressure by below equation：
PP=PBHP=PAF+P1
Wherein, PPIt is formation pore pressure, PBHPIt is shaft bottom drilling well liquid columnpressure, P1It is liquid column hydrostatic pressure, PAFIt is annular space
Frictional resistance.
In one embodiment, when drilling fluid inlet flow rate is less than drilling fluid return flow, the formation pore pressure
Computing module calculates formation pore pressure by below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, PPIt is formation pore pressure, q is formation fluid flow velocity, and K is stratum
Porosity, S is skin factor, and t is time of measuring interval after overflow occurs, and h is formation thickness, and φ is formation porosity, and c is ground
Layer fluid compressibility, rwIt is drilling well radius, γ is Euler's constant, and μ is fluid viscosity, and e is constant.
In one embodiment, when drilling fluid inlet flow rate is more than drilling fluid return flow, the formation pore pressure
Computing module calculates formation pore pressure by below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, PPIt is formation pore pressure, Q is wastage, and K permeates for stratum
Rate, h is formation thickness, and B is water volume coefficient, and μ is fluid viscosity, reIt is drainage radius, rwIt is drilling well radius, s is skin effect
Coefficient.
In one embodiment, also include：Screening module, after calculating formation pore pressure in real time, from calculating
Remove in the formation pore pressure data for drawing more than the first preset value or the numerical value less than the second arranges value, described first presets
Value is more than second arranges value.
In one embodiment, also include：Formation fracture pressure computing module, for being calculated formation pore pressure in real time
After power, formation fracture pressure is calculated according to the formation pore pressure for calculating in real time.
In embodiments of the present invention, by gathering the drilling well of the mud flow rate parameter, back pressure pump intake of mud pump inlet
Flow quantity parameter and drilling fluid return flow come the magnitude relationship between determining down-hole drilling fluids inlet flow rate and returning outflow,
And according to down-hole drilling fluids inlet flow rate and return magnitude relationship and formation condition information between outflow and calculate stratum in real time
The difference of pore pressure and shaft bottom drilling well liquid columnpressure, finally, according to known shaft bottom drilling well head of liquid and formation pore pressure
The difference of power and shaft bottom drilling well liquid columnpressure, calculates formation pore pressure in real time.Pass through down-hole drilling fluids inlet flow rate
The difference of formation pore pressure and shaft bottom drilling well liquid columnpressure is derived with the magnitude relationship between outflow is returned, and then is drawn
Formation pore pressure, with the prior art pass through dcIndex method compared determining formation pore pressure, it is to avoid drilling condition, rock
Property the factor such as change calculate stratum pore pressure cell the influence of result, and shaft bottom drilling fluid column is calculated by hydraulic formula
Pressure, it is contemplated that the influence of the factor such as bite type and bit wear and hydraulics, such that it is able to improve formation pore pressure meter
Calculate the degree of accuracy of result.
Obviously, those skilled in the art should be understood that each module or each step of the above-mentioned embodiment of the present invention can be with
Realized with general computing device, they can be concentrated on single computing device, or be distributed in multiple computing devices
On the network for being constituted, alternatively, the program code that they can be can perform with computing device be realized, it is thus possible to by it
Store and performed by computing device in the storage device, and in some cases, can be held with different from order herein
The shown or described step of row, or they are fabricated to each integrated circuit modules respectively, or by the multiple in them
Module or step are fabricated to single integrated circuit module to realize.So, the embodiment of the present invention is not restricted to any specific hard
Part and software are combined.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the embodiment of the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made
Any modification, equivalent substitution and improvements etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of determination method of formation pore pressure, it is characterised in that including：
The mud flow rate parameter of Real-time Collection mud pump inlet, the mud flow rate parameter of back pressure pump intake and drilling fluid are returned out
Flow；
The mud flow rate parameter of the mud pump inlet, the mud flow rate parameter of the back pressure pump intake according to collection and
The drilling fluid return flow, calculates down-hole drilling fluids inlet flow rate and returns the magnitude relationship between outflow；
According to down-hole drilling fluids inlet flow rate and the magnitude relationship and formation condition information between outflow are returned, calculate ground in real time
The difference of layer pore pressure and shaft bottom drilling well liquid columnpressure；
According to the formation pore pressure and the difference and known shaft bottom drilling well head of liquid of shaft bottom drilling well liquid columnpressure, in real time
Calculate formation pore pressure；
According to the formation pore pressure and the difference and the known shaft bottom drilling well head of liquid of shaft bottom drilling well liquid columnpressure,
Formation pore pressure is calculated in real time, including：
When drilling fluid inlet flow rate is less than drilling fluid return flow, formation pore pressure is calculated by below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, PPIt is formation pore pressure, q is formation fluid flow velocity, and K is formation pore
Rate, S is skin factor, and t is time of measuring interval after overflow occurs, and h is formation thickness, and φ is formation porosity, and c is ground laminar flow
Body compressibility, rwIt is drilling well radius, γ is Euler's constant, and μ is fluid viscosity, and e is constant.
2. the determination method of formation pore pressure as claimed in claim 1, it is characterised in that according to the formation pore pressure
And the difference of shaft bottom drilling well liquid columnpressure and the known shaft bottom drilling well head of liquid, calculate formation pore pressure in real time
Power, including：
When drilling fluid inlet flow rate is equal to drilling fluid return flow, formation pore pressure is calculated by below equation：
PP=PBHP=PAF+P1
Wherein, PPIt is formation pore pressure, PBHPIt is shaft bottom drilling well liquid columnpressure, P1It is liquid column hydrostatic pressure, PAFIt is annular space frictional resistance.
3. the determination method of formation pore pressure as claimed in claim 1, it is characterised in that according to the formation pore pressure
And the difference of shaft bottom drilling well liquid columnpressure and the known shaft bottom drilling well head of liquid, calculate formation pore pressure in real time
Power, including：
When drilling fluid inlet flow rate is more than drilling fluid return flow, formation pore pressure is calculated by below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, PPIt is formation pore pressure, Q is wastage, and K is in-place permeability, and h is
Formation thickness, B is water volume coefficient, and μ is fluid viscosity, reIt is drainage radius, rwIt is drilling well radius, s is skin effect coefficient.
4. the determination method of formation pore pressure as claimed any one in claims 1 to 3, it is characterised in that also include：
After calculating formation pore pressure in real time, remove default more than first from the formation pore pressure data for calculating
It is worth or less than the numerical value of the second arranges value, first preset value is more than second arranges value.
5. the determination method of formation pore pressure as claimed any one in claims 1 to 3, it is characterised in that also include：
After being calculated formation pore pressure in real time, formation fracture pressure is calculated according to the formation pore pressure for calculating in real time
Power.
6. a kind of determining device of formation pore pressure, it is characterised in that including：
Acquisition module, the mud flow rate ginseng of mud flow rate parameter, back pressure pump intake for Real-time Collection mud pump inlet
Number and drilling fluid return flow；
Magnitude relationship computing module, for mud flow rate parameter, the backpressure pump of the mud pump inlet according to collection
The mud flow rate parameter and the drilling fluid return flow of entrance, calculate down-hole drilling fluids inlet flow rate and return between outflow
Magnitude relationship；
Pressure differential computing module, for according to down-hole drilling fluids inlet flow rate and returning the magnitude relationship and stratum bar between outflow
Part information, calculates the difference of formation pore pressure and shaft bottom drilling well liquid columnpressure in real time；
Formation pore pressure computing module, for the difference according to the formation pore pressure and shaft bottom drilling well liquid columnpressure and
The shaft bottom drilling well head of liquid known, calculates formation pore pressure in real time；
When drilling fluid inlet flow rate is less than drilling fluid return flow, the formation pore pressure computing module passes through below equation
Calculate formation pore pressure：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, PPIt is formation pore pressure, q is formation fluid flow velocity, and K is formation pore
Rate, S is skin factor, and t is time of measuring interval after overflow occurs, and h is formation thickness, and φ is formation porosity, and c is ground laminar flow
Body compressibility, rwIt is drilling well radius, γ is Euler's constant, and μ is fluid viscosity, and e is constant.
7. the determining device of formation pore pressure as claimed in claim 6, it is characterised in that when drilling fluid inlet flow rate is equal to
During drilling fluid return flow, the formation pore pressure computing module calculates formation pore pressure by below equation：
PP=PBHP=PAF+P1
Wherein, PPIt is formation pore pressure, PBHPIt is shaft bottom drilling well liquid columnpressure, P1It is liquid column hydrostatic pressure, PAFIt is annular space frictional resistance.
8. the determining device of formation pore pressure as claimed in claim 6, it is characterised in that when drilling fluid inlet flow rate is more than
During drilling fluid return flow, the formation pore pressure computing module calculates formation pore pressure by below equation：
Wherein, PBHPIt is shaft bottom drilling well liquid columnpressure, PPIt is formation pore pressure, Q is wastage, and K is in-place permeability, and h is
Formation thickness, B is water volume coefficient, and μ is fluid viscosity, reIt is drainage radius, rwIt is drilling well radius, s is skin effect coefficient.
9. the determining device of the formation pore pressure as any one of claim 6 to 8, it is characterised in that also include：
Screening module, after calculating formation pore pressure in real time, from the formation pore pressure data for calculating
Fall more than the first preset value or the numerical value less than the second arranges value, first preset value is more than second arranges value.
10. the determining device of the formation pore pressure as any one of claim 6 to 8, it is characterised in that also include：
Formation fracture pressure computing module, after being calculated formation pore pressure in real time, according to the earth bore for calculating
Gap pressure calculates formation fracture pressure in real time.
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| CN105986814B (en) * | 2015-02-13 | 2019-12-13 | 中国石油化工股份有限公司 | Method for obtaining fracture healing index |
| CN106368691B (en) * | 2015-07-24 | 2021-05-28 | 中国石油化工股份有限公司 | Three-dimensional abnormal pore pressure prediction method based on rock physics seismic information |
| CN105626056B (en) * | 2015-12-22 | 2019-01-18 | 中国石油天然气集团公司 | A kind of method and apparatus of determining target area three-dimensional formation pore pressure |
| CN107642356B (en) * | 2016-07-20 | 2021-01-29 | 中国石油天然气股份有限公司 | Stratum pore pressure prediction method and device based on fracture leakage information |
| CN109458171B (en) * | 2018-10-23 | 2022-04-22 | 西南石油大学 | Novel method for measuring stratum leakage pressure with narrow safe density window |
| CN110146424B (en) * | 2019-05-08 | 2021-02-02 | 中国石油大学(北京) | Device and method for simulating stratum respiration effect |
| CN112241510A (en) * | 2019-07-16 | 2021-01-19 | 中石化石油工程技术服务有限公司 | Fault sealing logging evaluation method |
| CN114320265A (en) * | 2020-09-25 | 2022-04-12 | 中石化石油工程技术服务有限公司 | Well leakage early detection method based on underground engineering parameter measurement |
| CN115293462B (en) * | 2022-10-08 | 2023-01-10 | 西南石油大学 | Method for predicting size range of leakage channel based on deep learning |
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| US7984770B2 (en) * | 2008-12-03 | 2011-07-26 | At-Balance Americas, Llc | Method for determining formation integrity and optimum drilling parameters during drilling |
| CN101963056B (en) * | 2010-08-19 | 2014-04-09 | 中国石油大学(北京) | Method for predicting carbonate formation pore pressure by using log information |
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