CN1540138A - Method for measuring pore pressure in sandstone reservoir of adjustment well in oil field - Google Patents
Method for measuring pore pressure in sandstone reservoir of adjustment well in oil field Download PDFInfo
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- CN1540138A CN1540138A CNA2003101022160A CN200310102216A CN1540138A CN 1540138 A CN1540138 A CN 1540138A CN A2003101022160 A CNA2003101022160 A CN A2003101022160A CN 200310102216 A CN200310102216 A CN 200310102216A CN 1540138 A CN1540138 A CN 1540138A
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Abstract
A method for measuring the pore pressure in oil-bearing sandstone stratum of regulating well in oil field includes such steps as using conventional logging method to measure the deepth of some site in sandstone sludge, the sludge density, the viscosity coefficient of filtered drilling liquid, the resistivity of said drilling liquid and the natural potential value of said site, using mathematical stitistics to determine the diffusion adsorption potential of this region and filter potential coefficient, and calculating the pore pressure of this site by an equation.
Description
Technical field:
The present invention relates to a kind of measuring method of oil field geologic parameter, specifically relate to a kind of measurement method of waterflooding oil field adjustment well sandstone reservoir pore pressure.
Background technology:
To adjust the pore pressure of well sandstone reservoir be to be related to the key parameter of adjusting the win or lose of well wellbore construction to waterflooding oil field, therefore whether accurately just becomes the content that the drilling engineering technician extremely is concerned about to what its actual value was measured.The method of measuring pore pressure in the prior art is generally sound velocity method, this kind method starts from the sixties, its measuring principle is that the compacting situation according to the reservoir exerts an influence to degree of porosity, thereby interval transit time is changed, and then draws the pore pressure value according to the sound wave changing value.At early field life, because the reservoir pore pressure is many near reset pressure, the effect of utilizing sound velocity method to measure is reasonable, and therefore in the past few decades, measuring the reservoir pore pressure by sound velocity method has become the most frequently used a kind of technical scheme of those skilled in the art; But after the oil field is through long-term seperated layer water injection exploitation, because the non-homogeneity of reservoir makes pore pressure on horizontal and vertical very big variation take place all, pressure coefficient excursion in the vertical can reach 0.6-2.3 in a bite well, therefore in this case, utilize sound velocity method will no longer can accurately measure the pore pressure of reservoir.
Summary of the invention:
Utilize sound velocity method can't accurately measure the deficiency of pore pressure in order to solve the oil field that exists in the existing sandstone reservoir pore pressure measuring technique through long-term seperated layer water injection exploitation, the invention provides a kind of method of measuring oil field adjustment well sandstone reservoir pore pressure, but this kind measuring method have the high-precision measuring characteristics of waterflooding oil field adjustment well sandstone reservoir pore pressure.
Technical scheme of the present invention is: this kind measured the method for waterflooding oil field adjustment well sandstone reservoir pore pressure, and its key step is for recording depth value h, drilling fluid density value ρ, drilling fluid filtrate coefficient of viscosity μ, the drilling fluid resistivity R of certain 1 A in the sandstone mud respectively with the well logging conventional method
mAnd this natural potential value E, different curve depth values are proofreaied and correct its small depth error according to the oil reservoir electrical property feature obtain unified depth value H, the head of liquid value P that depth value H and mud density value are multiplied each other and draw this A
1, determine this sandstone area diffusion adsorption potential value E with mathematical statistics method
Da, the electrofiltration potential COEFFICIENT K
f, by formula P
p=P
1-μ (E-E
Da)/R
mK
fCalculate the pore pressure P of certain 1 A in the sandstone reservoir
P '
Wherein determine sandstone area diffusion adsorption potential value E with mathematical statistics method
DaConcrete steps at first producing the graph of a relation of layer of sand natural potential negative anomaly value and pressure reduction under a certain permeability, can draw the shown exceptional value of spontaneous potential curve according to the electrofiltration potential expression formula then and be and spread adsorption potential value E
DaIt is the intersection point of the Trendline and the longitudinal axis; Determine the electrofiltration potential COEFFICIENT K
fConcrete steps at first according to the characteristics of electrofiltration potential and being proportionate property of permeability, make the graph of a relation of pressure reduction electrofiltration potential and permeability when identical or close, the point that wherein looses among the figure is the average through obtaining after the classified statistics, variation according to height infiltration sand permeability influences very little rule to electrofiltration potential then, adopt correlation curve (as resistivity, the velocity of sound, rock density etc.) count the electrofiltration potential COEFFICIENT K
fExpression formula.
Description of drawings:
Fig. 1 is natural potential exceptional value and pressure reduction graph of a relation (is example with the Daqing oil field area)
Fig. 2 is electrofiltration potential and in-place permeability graph of a relation (is example with the Daqing oil field area)
The present invention has following useful effect: owing to take the method for such scheme to utilize nature The correlation of current potential and pressure reduction is so that pressure measurement range substantially exceeds other method, such as the velocity of sound Therefore method is used this method measurement hole pressure and is had the accurately characteristics of measuring.
The specific embodiment:
Below the invention will be further described, at first record depth value h, drilling fluid density value ρ, drilling fluid filtrate coefficient of viscosity μ, the drilling fluid resistivity R of certain 1 A in the sandstone mud respectively with the well logging conventional method
mAnd this natural potential value E:
1, depth calibrator is lowered to from well head, reads by cable and transmit and next signal;
2, will read depth value h carries out depth correction according to the different electrical property features on stratum and draws
Unified depth value H, the purpose of this step is to eliminate by proofread and correct the slight error that different curves are existed on the degree of depth (in well logging on-the-spot and indoorly all can finish);
3, the form that the primitive curve data behind the depth correction are approved according to the well logging private database carries out for example GB 716T form of format conversion, the purpose of this step is by format conversion initial data to be become the operable form of operational software, to satisfy the requirement of Computing;
4, use the drilling fluid density measuring instrument at the ground survey drilling fluid density, read density value
ρ; Use funnel viscosity meter or rotational viscometer to record the drilling fluid filtrate coefficient of viscosity
μ; Use the mud resistivity tester to record drilling fluid resistivity R
mAnd use potentiometer to record this natural potential value E.
The well logging of using in said process (test) instrument is specially:
Ground instrument: DLSIII type numerical control logging system, drilling fluid resistivity measurement instrument, drilling fluid viscosity measuring instrument.
Downhole instrument: high-resolution guard focusing device, natural potential well logging instrument, acoustic velocity log tool, rock density logging instrument etc.
Using method: downhole instrument is sent into the down-hole stratum and oil reservoir are measured with logging winch, cable, and different measuring value such as natural potential, the velocity of sound, resistivity and rock density etc. are sent to the DLSIII type numerical control logging system on ground with digital form, handle, computing and preservation.Use drilling fluid density measuring instrument and viscosity measuring instrument in the ground drilling liquid pool, to measure drilling fluid density and viscosity factor, reading numerical values, and import logging system with other well site data such as well-name, date, measuring well section etc.
Determine this sandstone area diffusion adsorption potential value E with mathematical statistics method
Da, the electrofiltration potential COEFFICIENT K
fDetailed process illustrate with a example in grand celebration oil extraction No.1 Factory area:
Diffusion adsorption potential value E
Da, the electrofiltration potential COEFFICIENT K
fDetermine generally do not take to measure the fluid salinity and permeability is carried out Calculation Method, but use the pressure data of area actual measurement, adopt mathematical statistics method to ask for.When property of drilling fluid and property of pore fluid are relatively stable, the scatter diagram of natural potential and pressure reduction as shown in Figure 1, it is linear for natural potential exceptional value that as can be seen from the figure the reservoir permeability is identical or close and pressure reduction.When pressure reduction convergence 0, the electrofiltration potential value levels off to 0, and at this moment the shown exceptional value of spontaneous potential curve is diffusion adsorption potential value, the i.e. intersection point of the Trendline and the longitudinal axis among Fig. 1.Just can adopt correlation curve to count the diffusion adsorption potential E of different permeability oil reservoirs according to the method
DaExpression formula.
Under the metastable condition of property of drilling fluid, property of pore fluid and pressure reduction, the electrofiltration potential COEFFICIENT K
fBe the physical quantity relevant with oozing property of rock pore.Using actual measurement RFT data divides into groups the oil reservoir individual layer by different pressure reduction, make permeability one electrofiltration potential scatter diagram, be Fig. 2, at the mud stone place, electrofiltration potential is tending towards 0 as seen from the figure, by mud stone when the sandstone transition, electrofiltration potential increases rapidly, when permeability continued to increase, electrofiltration potential had a declining tendency on the contrary, meets the capillary flow potentiodynamic theory.According to this rule, just can adopt correlation curve (as resistivity, the velocity of sound, rock density etc.) to count the electrofiltration potential COEFFICIENT K
fExpression formula.
Claims (2)
1, a kind of method of measuring oil field adjustment well sandstone reservoir pore pressure is characterized in that: depth value h, the drilling fluid density value ρ, drilling fluid filtrate coefficient of viscosity μ, the drilling fluid resistivity R that record certain 1 A in the sandstone mud with the well logging conventional method respectively
mAnd this natural potential value E, different curve depth values are proofreaied and correct its small depth error according to the oil reservoir electrical property feature obtain unified depth value H, the head of liquid value P that depth value H and mud density value are multiplied each other and draw this A
l, determine this sandstone area diffusion adsorption potential value E with mathematical statistics method
Da, the electrofiltration potential COEFFICIENT K
f, by formula P
p=P
l-μ (E-E
Da)/R
mK
fCalculate the pore pressure P of certain 1 A in the sandstone reservoir
P '
2, a kind of mensuration according to claim 1 waterflooding oil field adjust the method for well sandstone reservoir pore pressure, it is characterized in that: determine sandstone area diffusion adsorption potential value E with mathematical statistics method
DaConcrete steps at first producing the graph of a relation of layer of sand natural potential negative anomaly value and pressure reduction under a certain permeability, can draw the shown exceptional value of spontaneous potential curve according to the electrofiltration potential expression formula then and be and spread adsorption potential value E
DaIt is the intersection point of the Trendline and the longitudinal axis; Determine the electrofiltration potential COEFFICIENT K
fConcrete steps at first according to the characteristics of electrofiltration potential and being proportionate property of permeability, make the graph of a relation of pressure reduction electrofiltration potential and permeability when identical or close, the point that wherein looses among the figure is the average through obtaining after the classified statistics, variation according to height infiltration sand permeability influences very little rule to electrofiltration potential then, draws the electrofiltration potential COEFFICIENT K
fExpression formula.
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| CNA2003101022160A CN1540138A (en) | 2003-10-27 | 2003-10-27 | Method for measuring pore pressure in sandstone reservoir of adjustment well in oil field |
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| CNA2003101022160A CN1540138A (en) | 2003-10-27 | 2003-10-27 | Method for measuring pore pressure in sandstone reservoir of adjustment well in oil field |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101936157A (en) * | 2010-08-19 | 2011-01-05 | 中国石油大学(北京) | Method for detecting pore pressure of high pressure saltwater layer by using log information |
| CN101963056A (en) * | 2010-08-19 | 2011-02-02 | 中国石油大学(北京) | Method for predicting carbonate formation pore pressure by using log information |
| CN102621586A (en) * | 2012-03-28 | 2012-08-01 | 康志勇 | Stratum data processing method for identifying stratum attribute |
| CN101775983B (en) * | 2010-02-09 | 2012-10-31 | 中国石油天然气股份有限公司 | Sandstone reservoir water layer resistivity-based stratum data processing method |
| CN105756651A (en) * | 2016-04-18 | 2016-07-13 | 中国海洋石油总公司 | Positive-pressure-drilling water plugging and staged-fracturing production increasing process method for adjustment well |
| CN112818517A (en) * | 2021-01-07 | 2021-05-18 | 大庆石油管理局有限公司 | Low-permeability oilfield drilling fluid density design method |
| CN113625364A (en) * | 2021-08-18 | 2021-11-09 | 西南石油大学 | Shale formation pore pressure calculation method based on double correction |
-
2003
- 2003-10-27 CN CNA2003101022160A patent/CN1540138A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775983B (en) * | 2010-02-09 | 2012-10-31 | 中国石油天然气股份有限公司 | Sandstone reservoir water layer resistivity-based stratum data processing method |
| CN101936157A (en) * | 2010-08-19 | 2011-01-05 | 中国石油大学(北京) | Method for detecting pore pressure of high pressure saltwater layer by using log information |
| CN101963056A (en) * | 2010-08-19 | 2011-02-02 | 中国石油大学(北京) | Method for predicting carbonate formation pore pressure by using log information |
| CN101936157B (en) * | 2010-08-19 | 2013-06-05 | 中国石油大学(北京) | Method for detecting pore pressure of high pressure saltwater layer by using log information |
| 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 |
| CN102621586A (en) * | 2012-03-28 | 2012-08-01 | 康志勇 | Stratum data processing method for identifying stratum attribute |
| CN105756651A (en) * | 2016-04-18 | 2016-07-13 | 中国海洋石油总公司 | Positive-pressure-drilling water plugging and staged-fracturing production increasing process method for adjustment well |
| CN112818517A (en) * | 2021-01-07 | 2021-05-18 | 大庆石油管理局有限公司 | Low-permeability oilfield drilling fluid density design method |
| CN113625364A (en) * | 2021-08-18 | 2021-11-09 | 西南石油大学 | Shale formation pore pressure calculation method based on double correction |
| CN113625364B (en) * | 2021-08-18 | 2022-08-02 | 西南石油大学 | Shale formation pore pressure calculation method based on double correction |
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