CN102243196B - Method for quickly detecting saturation exponent n in laboratory - Google Patents
Method for quickly detecting saturation exponent n in laboratory Download PDFInfo
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- CN102243196B CN102243196B CN2011101056405A CN201110105640A CN102243196B CN 102243196 B CN102243196 B CN 102243196B CN 2011101056405 A CN2011101056405 A CN 2011101056405A CN 201110105640 A CN201110105640 A CN 201110105640A CN 102243196 B CN102243196 B CN 102243196B
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Abstract
The invention provides a method (three-point method) for quickly detecting a saturation exponent n in a laboratory. The method realizes the following three particular targets: (1) on the premise that capillary force and resistivity balance are ensured, the water saturation and resistivity of a core can be measured accurately; (2) the experiment testing period is shortened to 2 weeks from 2 months; and (3) whether the relationship between the resistance increase and the water saturation of rock conforms to the Archie relationship or not can be judged, and the saturation exponent n is given if the relationship between the resistance increase and the water saturation of rock conforms to the Archie relationship. The three-point method can efficiently detect reservoir saturation without risk.
Description
Technical field
The present invention relates to measure in the exploration geophysics field method of rock electricity parameter, specifically is the method for a kind of laboratory fast measuring reservoir SEXP n.
Background technology
A Erqi (Archie) electrically tests according to the clean sandstone formation core and has set up resistivity Magnification (R
I) and WS (Sw) and formation factor (F
F) and the relation of factor of porosity (φ), i.e. A Erqi (Archie) formula:
R
I＝Rt/Ro＝1/S
n W (1)
F
F＝R
0/Rw＝1/φ
m (2)
In the formula, Rt is the true resistivity of the rock core of saturated local water and hydrocarbon, and Ro is the resistivity of complete water bearing sand, and Rw is the stratum resistivity of water, and m is a cementation exponent, and n is a SEXP.A Erqi (Archie) formula has been set up the tie of contact between porosity measurement and resistivity measurement, and has constituted the theoretical foundation of the original oil-containing of application of electrical measurement well data quantitative evaluation " clean formation " (gas) saturation degree.Usually, regard cementation exponent m that comprises in the Archie formula and SEXP n as characterising parameter, be loosely referred to as litho-electric parameters (have be called Archie parameter), and confirm that the process of litho-electric parameters is called rock core and electrically tests to experiment the rock electrical properties.From the desirability to the reservoir exact evaluation, the electrical experimental technique of rock core, Study on Technology are the emphasis of reservoir rocks Physical Experiment research always.
Current experimental determination reservoir SEXP n mainly contains two kinds of methods:
(1) common method:
Use hydro-extractor or common displacement system to change rock core water containing saturability apace, measure rock core WS and resistivity after mathematics manipulation obtain.The concrete operations step is: 1. rock core to preparing, measure saturation degree Sw and resistivity Rt under its original state; 2. centrifuge speed or displacement working pressure are set, change plunger rock core water containing saturability Sw, measure the resistivity Rt under this WS Sw state with the mode that increases or fall (moisture) saturation degree; 3. increase centrifuge speed or displacement working pressure gradually, 2. repetitive process no longer changes (maximum (top) speed or working pressure that concrete numerical value depends on hydro-extractor or driving device) to WS Sw; 4. calculate the resistance Magnification I under the different water cut saturation degree Sw state, under log-log coordinate, draw the X plot (Fig. 1) of resistance Magnification I and WS Sw, obtain SEXP n behind the power function fitting; The prerequisite that this method obtains: the two is " linearity " relation, also claims Archie relation, the right and wrong Archie relation relative with it.The characteristics of this way are that the experiment test cycle is short, and shortcoming is not consider that (the balance here is meant: when hole contained two fluids more than mutually, the micro Distribution adjustment of hole internal flow needed spended time to the balance of capillary force and resistivity.The result of final balance is that rock core water containing saturability, oil (gas) the water micro Distribution of experimental observation is stable; Pressure, constant resistivity), so the experiment measuring precision is not high.
(2) recommend method (baffle method):
In order to ensure capillary pressure and resistivity balance; Improve the measuring accuracy of SEXP n; The way that recommend in the laboratory is to adopt the mode of capillary pressure and resistivity translocation to accomplish the measurement of SEXP n (device is seen Fig. 2, is to have used semi-permeable dividing plate at the fluid outlet end with the difference of practices well device).The measuring process of this method: 1. measure saturation degree Sw and resistivity Rt under the rock core original state; The working pressure that displacement (non-wetting phase drive row wetting phase) 2. is set or sucks (the non-wetting phase of wetting phase drive row) changes the WS of rock core lentamente, measures the WS Sw and the resistivity Rt of rock core to capillary pressure and the resistivity balance; 3. increase working pressure gradually, 2. repeating step no longer changes (irreducible water saturation Swi or irreducible oil (gas) saturation degree state Sor) to WS, finishes the experiment measuring of WS Sw and resistivity Rt.4. calculate the resistance Magnification I under the different water cut saturation degree Sw state, under log-log coordinate, draw the X plot of resistance Magnification I and WS Sw, obtain SEXP n behind the power function fitting; The prerequisite that this method obtains remains the two and is " linearity " relation, also claims Archie relation.There is following problem in this recommendation way: owing to will consider capillary force and the resistivity balance after saturation degree changes; Often need to stablize 7-10 days at each displacement working pressure point (corresponding) with the WS of rock core; If obtain the resistivity of 5-7 WS state; The experiment measuring of accomplishing SEXP n needs about 2 months, and the test period of experiment is long.Accurately obtaining under the prerequisite of SEXP n; How accomplishing experiment test apace is a realistic problem, extremely important to the formulation of the quick evaluation (requiring to accomplish in week at 1-2) of the oily reservoir of some preparatory reconnaissance borehole, appraisal well and follow-up completion decision-making.
A kind of " two-point method " arranged in the prior art, that is: confirm SEXP n with the resistance Magnification of the saturation degree state of WS 100% and these 2 pore fluid distributional stabilities of irreducible water saturation Swi.This method has the advantage that need not consider capillary force and resistivity balance.Although the proposition of this method is an accuracy of measurement of wanting to improve SEXP n, for the situation that meets Archie relation a kind of quick measuring method of can yet be regarded as.But owing to reasons such as wetting state, pore textures, the relation of Rock resistivity Magnification and WS possibly not deferred to the Archie relation, non-Archie relation shown in Figure 3 promptly occurs.Can't know in advance under the situation whether the Archie formula is suitable for, use " two point method " to have risk.
Summary of the invention
In order to solve existing problem in the above-mentioned prior art, the object of the invention is exactly the method that will design a kind of laboratory fast measuring reservoir SEXP n.This method will realize following 3 objectives: 1. under the prerequisite of guaranteeing capillary force and resistivity balance, accurately measure the WS and the resistivity of rock core; 2. the experiment test cycle was foreshortened to for 2 weeks from 2 months; Whether the relation that 3. can judge Rock resistivity Magnification and WS defers to the Archie relation, as meets and then provide SEXP n.
A kind of laboratory fast measuring reservoir SEXP n " three point method " proposed particularly.This method principal feature is: 1) guaranteeing only to measure the measurement that the resistivity of rock core under 3 WS states is accomplished SEXP n under capillary force and the resistivity balance prerequisite---i.e. the origin of " three point method "; 2) adopt relative permeability and resistivity translocation mode to accomplish the measurement of reservoir WS index n; 3) experiment test can be accomplished within 2 weeks.
For achieving the above object, the present invention takes following technical scheme:
The measuring method of the intermediate-wet reservoir SEXP n of a kind of oily expelling water or gas drive water process comprises the steps:
1) with the saturated plunger rock core that has prepared of stratum water evacuation pressurization;
2) rock core places relative permeability and resistivity translocation system, and the measurement rock core water containing saturability is 100% o'clock resistivity R
o
3) use in-place oil, refining oil or helium displacement rock core water containing saturability to oil, water that permeability is equated or gas, water equate permeability, stop displacement, measured and wait the resistivity Rwhe that oozes a Swhe to the resistivity balance in balance 7-10 days;
4) continuing displacement to water relative permeability is 0, measures the resistivity Rwi of rock core at irreducible water saturation Swi;
5) calculate WS be 100%, etc. ooze point, and the resistance Magnification I of these three saturation degrees of irreducible water; Under log-log coordinate, draw the X plot of resistance Magnification I and WS Sw; If WS and resistance Magnification are linear, then power function fitting provides SEXP n.
According to one embodiment of the invention, preparation plunger rock core comprises: choose, drilling, washing oil, desalinization of soil by flooding or leaching step.
A kind of Bian Shui, Di Shui or etc. salinity inject the measuring method that water gets into the SEXP n of oily reservoir process, comprise the steps:
1) with the saturated plunger rock core that has prepared of stratum water evacuation pressurization, the measurement rock core water containing saturability is 100% o'clock resistivity R
o, it is used for the calculated resistance Magnification;
2) rock core places relative permeability and resistivity translocation system, and using in-place oil or refining oil, helium displacement rock core to water relative permeability is 0, measures the resistivity Rwi of rock core at irreducible water saturation Swi;
3) water displacing oil to oil, water equate that to permeability perhaps gas drive oil to oil, gas phase equate permeability, stop displacement, and measurement waited the resistivity Rwhe that oozes a Swhe to the resistivity balance in balance 7-10 days;
4) relative permeability of continuation water drive to oil phase or gas phase is 0, measures the resistivity R of rock core at residual oil saturation Sor
Or
5) calculate irreducible water saturation, etc. ooze the resistance Magnification I of point, these three saturation degrees of remaining oil gas; Under log-log coordinate, draw the X plot of resistance Magnification I and WS Sw; If WS and resistance Magnification are linear, then power function fitting provides SEXP n.
According to one embodiment of the invention, preparation plunger rock core comprises: choose, drilling, washing oil, desalinization of soil by flooding or leaching step.
According to one embodiment of the invention, the rock core in the step 3) was done the aging recovery of wettability.
The measuring method of the intermediate-wet reservoir SEXP n of a kind of oily expelling water or gas drive water process; This measuring method is used relative permeability and resistivity translocation system; This system comprises constant speed and constant pressure pump (1), HASSLER clamper (5), intelligent LCR appearance, (6), electronic balance (7); This measuring method comprises the steps:
1) with the saturated plunger rock core that has prepared of stratum water evacuation pressurization;
2) rock core places HASSLER clamper (5), uses intelligent LCR appearance (6) measuring resistance r, calculates following formula and obtains resistivity Ro;
In the formula: L is a spread of electrodes, and S is the rock sample cross-sectional area;
3) start constant speed and constant pressure pump (1), adopt constant voltage mode oil expelling water or gas drive water to oil, water that permeability is equated or gas, water equate permeability; Measuring definite grade of the water yield by electronic balance (7) oozes a little; Close constant speed and constant pressure pump and HASSLER clamper endpiece valve, use intelligent LCR appearance (6) measuring resistance r, measure to wait and oozes a resistance r, calculate etc. and to ooze a resistivity Rwhe to invariable;
5) restart constant speed and constant pressure pump (1), adopting the relative permeability of constant voltage mode oil expelling water or gas drive water to water is 0, i.e. the resistivity r of irreducible water saturation Swi is measured in no longer water outlet of endpiece, calculates the resistivity Rwi of irreducible water saturation;
6) calculate WS be 100%, etc. ooze resistance Magnification I under point, these three saturation degree states of irreducible water; Under log-log coordinate, draw the X plot of resistance Magnification I and WS Sw; If WS and resistance Magnification are linear, then power function fitting provides SEXP n.
A kind of Bian Shui, Di Shui or etc. salinity inject the measuring method that water gets into the SEXP n of oily reservoir process; This measuring method is used relative permeability and resistivity translocation system, and this system comprises constant speed and constant pressure pump (1), HASSLER clamper (5), intelligent LCR appearance (6), electronic balance (7): this measuring method comprises the steps:
1) with the saturated plunger rock core that has prepared of stratum water evacuation pressurization,
2) rock core places HASSLER clamper (5), uses intelligent LCR appearance (6) measuring resistance r, calculates WS and be 100% resistivity Ro;
3) start the constant speed and constant pressure pump, adopting constant voltage mode oil expelling water or gas drive water to water relative permeability is zero, measures irreducible water saturation S
WiResistivity r under the state
Wi, calculate resistivity R under the irreducible water saturation state
Wi
5) adopt water displacing oil or water drive gas to oil, water two phase relative permeability identical pointses or gas, water two phase relative permeability identical pointses; Close constant speed and constant pressure pump and HASSLER clamper endpiece valve; Use intelligent LCR appearance measuring resistance r to invariable, measure to wait and ooze a resistance r
Whe, calculate etc. and to ooze a resistivity R
Whe
6) restart the constant speed and constant pressure pump, continuing water displacing oil or water drive gas is 0 to oil relative permeability, i.e. the irreducible oil state; Measure residual oil saturation S
OrResistivity r under the state
Or, calculate resistivity R under the residual oil saturation state
Or
7) calculate irreducible water saturation, etc. ooze resistance Magnification I under point, these three saturation degree states of remaining oil gas, drafting resistance Magnification I and WS S under log-log coordinate
wX plot, if WS and resistance Magnification are linear, then power function fitting provides SEXP n.
According to one embodiment of the invention, preparation plunger rock core comprises: choose, drilling, washing oil, desalinization of soil by flooding or leaching step.
According to one embodiment of the invention, the rock core in the step 3) was done the aging recovery of wettability.
Description of drawings:
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, does not constitute qualification of the present invention.In the accompanying drawings:
Fig. 1 is resistance Magnification I and WS S
WThe X plot synoptic diagram shows resistance Magnification I and WS S
WRelation be " linearity ", behind the power function fitting, can obtain saturation parameters n.
Fig. 2 measures way---the device synoptic diagram of capillary pressure curve and resistivity translocation that recommend in reservoir SEXP n laboratory; Be to use semi-permeable dividing plate to guarantee drive row oil (gas), water lentamente with the main difference of common method, the monitoring that cooperates aquifer yield, pressure and resistivity is to guarantee to obtain the WS and the resistivity of capillary force and resistivity equilibrium state.
The positive curvature and the negative curvature curve synoptic diagram of Fig. 3 right and wrong Archie relation have been described Archie relation and 2 kinds of possible non-Archie relations.
Fig. 4 is that " three point method " of the reservoir SEXP n of oil (gas) expelling water process measured process flow diagram.
Fig. 5 is that " three point method " of the reservoir SEXP n of water displacing oil (gas) process measured process flow diagram.
Fig. 6 is oil (gas) expelling water process " three point method " measuring resistance Magnification and a saturation degree X plot, show available WS 100%, etc. ooze resistivity measurement judgement resistance Magnification I and the WS S under a Swhe, these 3 saturation degree states of irreducible water saturation Swi
WRelation whether defer to Archie relation and provide SEXP n.
Fig. 7 is water displacing oil (gas) process " three point method " measuring resistance Magnification and saturation degree X plot, show available irreducible water saturation Swi, etc. the resistivity measurement of oozing under a Swhe, these 3 saturation degree states of residual hydrocarbon saturation Sor judge resistance Magnification I and WS S
WRelation whether defer to Archie relation and provide SEXP n.
Fig. 8 is instance oil (gas) expelling water process " three point method " measuring resistance Magnification and saturation degree X plot.
Fig. 9 is instance water displacing oil (gas) process " three point method " measuring resistance Magnification and saturation degree X plot.
Figure 10 is relative permeability and resistivity translocation system.Among the figure: 1, constant speed and constant pressure pump; 2, fluid line; 3, intermediate receptacle; 4, tensimeter; 5, Hassler clamper claims that also Haas reins in clamper; 6, intelligent LCR measuring is also claimed intelligent LCR measuring instrument; 7, electronic balance; 8, oil-water separator; 9, power lead.
Embodiment
The concrete technological approaches of realizing goal of the invention: reduce rock core saturation degree control number, shorten capillary force and resistivity equilibration time.Major technique foundation: 1) whether defer to the Archie relation, only measure the resistivity of rock core under 3 equally distributed saturation degree states and just can observe resistance Magnification and WS and whether exist " linearity " to concern if want to judge the relation of Rock resistivity Magnification and WS; 2) rock core water containing saturability is 100% o'clock, and monophasic fluid is only arranged in the hole---salt solution exists, and capillary pressure and resistivity are stable; Distinguish not flow state of corresponding salt solution, oil gas when irreducible water saturation Swi, residual hydrocarbon saturation Sor state, capillary pressure and resistivity also are stable.If choosing these 3 saturation degree states measures rock core resistivity, needn't consider the equilibrium problem of capillary pressure and resistivity; 3) if choose 2 of aforementioned 3 saturation degree states; Add a middle WS state between 2 species saturation states; Ooze a Swhe as waiting,, also can in 2 weeks, take into account the measurement that capillary force and resistivity balance are accomplished SEXP n even if need balance 7-10 days; 4) if the relation of resistance Magnification and WS meets the Archie relation; Consider that reservoir SEXP n is the engineering reality of confirming with the resistance Magnification and the saturation data merging of m the variant rock core of rerum natura; The irreducible water saturation Swi of each rock core, etc. to ooze a Swhe, residual hydrocarbon saturation Sor different; Then on the resistance Magnification of oil (gas) expelling water process and the WS X plot 2m+1 diffusing point arranged; 3m diffusing point arranged on the resistance Magnification of water displacing oil (gas) process and the WS X plot, if m is enough big, the plate of making also satisfies the requirement of calculation of reserves; 5) even if the relation of resistance Magnification and WS does not meet the Archie relation, above-mentioned observation data also can guarantee to observe the Changing Pattern of rock core resistivity with WS carefully, to set up new saturation equation.
The present invention realizes through following mode:
At first, the measurement requirement of clear and definite reservoir SEXP n is confirmed choosing of " 3 points ".If the SEXP n when obtaining oil (gas) and getting into reservoir (being equivalent to oil gas becomes to hide), choose WS 100%, etc. ooze a Swhe, these 3 saturation degree states of irreducible water saturation Swi are carried out experiment measuring and are got final product; If the SEXP n when obtaining water and getting into oily reservoir (being similar to limit, end water water logging), choose irreducible water saturation Swi, etc. ooze a Swhe, these 3 saturation degree states of residual hydrocarbon saturation Sor are carried out experiment and are got final product.
Secondly, will test with rock core according to test request pack into relative permeability and resistivity translocation device, the resistivity measurement of pressing 3 saturation degree states of Fig. 4, oily (gas) expelling water process of operation steps shown in Figure 5 completion, water displacing oil (gas) process.
At last, draw the resistance Magnification and the WS X plot (Fig. 6, Fig. 7) of oil (gas) expelling water, water displacing oil (gas) process, power function fitting is confirmed SEXP n.
Describe the present invention in detail below in conjunction with accompanying drawing and embodiment.
Scheme one, the measuring process (Fig. 4) of the intermediate-wet reservoir SEXP n of oil (gas) expelling water process is:
1) prepares (make and clean) good plunger rock core with water evacuation pressurization in stratum is saturated;
2) rock core places relative permeability and resistivity translocation system, and the measurement rock core water containing saturability is 100% o'clock resistivity R
o
3) use in-place oil or refining oil, helium displacement rock core water containing saturability to oil (gas), water that permeability is equated, stop displacement, measured and wait the resistivity Rwhe that oozes a Swhe to the resistivity balance in balance 7-10 days;
4) continuing displacement to water relative permeability is 0, measures the resistivity Rwi of rock core at irreducible water saturation Swi;
5) calculate WS be 100%, etc. ooze point, and the resistance Magnification I of these three saturation degrees of irreducible water; Under log-log coordinate, draw the X plot of resistance Magnification I and WS Sw; If WS and resistance Magnification are linear, then power function fitting provides SEXP n.(explain: the resistivity of these three saturation degree states has only been surveyed in experiment).
Scheme two, limit, Di Shui, etc. salinity inject the measuring process (Fig. 5) that water gets into the SEXP n of oily reservoir process and be:
1) prepare (make and clean) good plunger rock core with water evacuation pressurization in stratum is saturated, the measurement rock core water containing saturability is 100% o'clock resistivity R
o(only supplying the calculated resistance Magnification to use);
2) rock core places relative permeability and resistivity translocation system; Using in-place oil or refining oil, helium (rock core done wetting state " wear out " recovery) displacement rock core to water relative permeability is 0, and the measurement rock core is at the resistivity Rwi of irreducible water saturation Swi;
3) water displacing oil (gas) to oil (gas), water equate permeability, stop displacement, measure and wait the resistivity Rwhe that oozes a Swhe to the resistivity balance in balance 7-10 days;
4) continuing water drive to oil (gas) phase relative permeability is 0, measures the resistivity R of rock core at residual oil saturation Sor
Or
5) calculate irreducible water saturation, etc. ooze the resistance Magnification I of point, these three saturation degrees of remaining oil gas; Under log-log coordinate, draw the X plot of resistance Magnification I and WS Sw; If WS and resistance Magnification are linear, then power function fitting provides SEXP n.(explain: the resistivity of 4 saturation degrees has been surveyed in experiment, but only used irreducible water saturation, etc. ooze point, these three state of saturation of remaining oil gas resistivity confirm SEXP n, remain " three point method ").
Scheme one: the practical measuring examples (see figure 8) of the intermediate-wet reservoir SEXP n of oil (gas) expelling water process:
1) at first 10 samples have been done the pre-service before the experiment, comprise choose, drilling, washing oil, the desalinization of soil by flooding or leaching;
2) 10 samples are vacuumized the saturated local water of pressurization;
3) put into 10 HASSLER clampers 5 shown in Figure 10; Use intelligent LCR appearance 6 measuring resistance r; Calculate resistivity Ro (
L is a spread of electrodes, and S is the rock sample cross-sectional area);
4) start constant speed and constant pressure pump 1, the relative permeability of employing constant voltage mode oil (gas) expelling water to oil (gas), water equates, measures definite grade of the water yield by electronic balance 7 and oozes a little.Close constant speed and constant pressure pump and HASSLER clamper 5 endpiece valves, use intelligent LCR appearance 6 measuring resistance r, measure to wait and oozes a resistance r, calculate etc. and to ooze a resistivity Rwhe to invariable;
5) restart constant speed and constant pressure pump 1, adopting the relative permeability of constant voltage mode oil (gas) expelling water to water is 0 (producing water ratio equals 0, i.e. no longer water outlet of endpiece), measures the resistivity r of irreducible water saturation Swi, calculates the resistivity Rwi of irreducible water saturation;
6) calculate full fully water, etc. ooze resistance Magnification I under point, these three saturation degree states of irreducible water; (point that looses in the circle of Fig. 8 upper left corner is the resistance Magnification of irreducible water saturation to the X plot of drafting resistance Magnification I and WS Sw under log-log coordinate; The point that looses in the circle of the lower right corner oozes resistance Magnification a little for waiting); If WS and resistance Magnification are linear, then power function fitting provides SEXP n.In this example, Fig. 8 is last to show 21 diffusing points altogether: wherein: 1. each rock core when WS 100%, resistance Magnification I be 1,10 block of rock core the point that looses is all arranged is (100%, 1), 1 diffusing point of demonstration on the figure; 2. the pore structure characteristic of each rock core is different, and the irreducible water saturation Swi of 10 blocks of rock cores is different, and the resistance Magnification is also different, and 10 diffusing points (in the circle of upper left side) are therefore arranged; 3. same, the grade of 10 blocks of rock cores is oozed a difference, and the resistance Magnification is also different, therefore have 10 diffusing points (100% and irreducible water saturation Swi between).Show on the figure: the resistance Magnification I of every block of rock core and WS meet the Archie relation, confirm that SEXP n is 2.08; The result that surveys and baffle method identical, but accomplishing whole test durations is merely 10-14 days.
Scheme two: Bian Shui, Di Shui or etc. salinity inject the practical measuring examples (Fig. 9) that water gets into the SEXP n of oily reservoir process.
1) rock sample pre-service before the experiment.Comprise the choosing of 8 samples, drilling, washing oil, desalinization of soil by flooding or leaching etc.;
2) rock sample is vacuumized the saturated local water of pressurization;
3) the water rock sample (rock sample done wetting state " wear out " recovery) of will satisfying is put into the HASSLER clamper, uses intelligent LCR appearance measuring resistance r, calculates resistivity R
0(only supplying the calculated resistance Magnification to use);
4) start the constant speed and constant pressure pump, adopting constant voltage mode oil (gas) expelling water to water relative permeability is zero, measures irreducible water saturation S
WiResistivity r under the state
Wi, calculate resistivity R under the irreducible water saturation state
Wi
5) adopt water displacing oil (gas) to oil (gas), water two phase relative permeability identical pointses, close constant speed and constant pressure pump and HASSLER clamper endpiece valve, use intelligent LCR appearance measuring resistance r, measure to wait and oozes a resistance r, calculate etc. and to ooze a resistivity R to invariable
Whe
6) restart the constant speed and constant pressure pump, continuing water displacing oil (gas) is 0 to oil relative permeability, i.e. the irreducible oil state.Measure residual oil saturation S
OrResistivity r under the state
Or, calculate resistivity R under the residual oil saturation state
Or
7) calculate irreducible water saturation, etc. ooze resistance Magnification I under point, these three saturation degree states of remaining oil gas, drafting resistance Magnification I and WS S under log-log coordinate
wX plot, as shown in Figure 9.This example has been selected 8 rock samples altogether for use, and the point that looses in the ellipse of the upper left corner is irreducible water saturation and resistance Magnification, and the point that looses in the centre is oval is to wait to ooze a saturation degree and resistance Magnification, and the point that looses in the ellipse of the lower right corner is residual hydrocarbon saturation and resistance Magnification.Show resistance Magnification I and WS S on the figure
wMeet the Archie relation.When b=1, power function fitting draws SEXP n=1.94; Survey the result and baffle method is identical.Accomplishing whole test durations is merely 12-15 days.
Above-described specific embodiment; The object of the invention, technical scheme and beneficial effect have been carried out further explain, and institute it should be understood that the above is merely specific embodiment of the present invention; And be not used in qualification protection scope of the present invention; All within spirit of the present invention and principle, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the measuring method of the intermediate-wet reservoir SEXP n of oily expelling water or gas drive water process comprises the steps:
1) with the saturated plunger rock core that has prepared of stratum water evacuation pressurization;
2) rock core places relative permeability and resistivity translocation system, and the measurement rock core water containing saturability is 100% o'clock resistivity R
o
3) use in-place oil, refining oil or helium displacement rock core water containing saturability to oil, water that permeability is equated or gas, water equate permeability, stop displacement, measured and wait the resistivity Rwhe that oozes a Swhe to the resistivity balance in balance 7-10 days;
4) continuing displacement to water relative permeability is 0, measures the resistivity Rwi of rock core at irreducible water saturation Swi;
5) calculate WS be 100%, etc. ooze point, and the resistance Magnification I of these three saturation degrees of irreducible water; Under log-log coordinate, draw the X plot of resistance Magnification I and WS Sw; If WS and resistance Magnification are linear, then power function fitting provides SEXP n.
2. method according to claim 1, preparation plunger rock core comprises: choose, drilling, washing oil, desalinization of soil by flooding or leaching step.
A Bian Shui, Di Shui or etc. salinity inject the measuring method that water gets into the SEXP n of oily reservoir process, comprise the steps:
1) with the saturated plunger rock core that has prepared of stratum water evacuation pressurization, the measurement rock core water containing saturability is 100% o'clock resistivity R
o, it is used for calculated resistance Magnification I;
2) rock core places relative permeability and resistivity translocation system, and using in-place oil, refining oil or helium displacement rock core to water relative permeability is 0, measures the resistivity Rwi of rock core at irreducible water saturation Swi;
3) water displacing oil to oil, water equate that to permeability perhaps gas drive oil to oil, gas phase equate permeability, stop displacement, and measurement waited the resistivity Rwhe that oozes a Swhe to the resistivity balance in balance 7-10 days;
4) relative permeability of continuation water drive to oil phase or gas phase is 0, measures the resistivity R of rock core at residual oil saturation Sor
Or
5) calculate irreducible water, etc. ooze the resistance Magnification I of point, these three saturation degrees of irreducible oil; Under log-log coordinate, draw the X plot of resistance Magnification I and WS Sw; If WS and resistance Magnification are linear, then power function fitting provides SEXP n.
4. method according to claim 3, preparation plunger rock core comprises: choose, drilling, washing oil, desalinization of soil by flooding or leaching step.
5. method according to claim 3, the rock core in the step 3) were done the aging recovery of wettability.
6. the measuring method of the intermediate-wet reservoir SEXP n of oily expelling water or gas drive water process; This measuring method is used relative permeability and resistivity translocation system, and this system comprises that constant speed and constant pressure pump (1), Haas rein in clamper (5), intelligent LCR measuring instrument (6), electronic balance (7): this measuring method comprises the steps:
1) with the saturated plunger rock core that has prepared of stratum water evacuation pressurization;
2) rock core places Haas to rein in clamper (5), uses intelligent LCR measuring instrument (6) measuring resistance r, and utilizing computes to obtain WS is 100% resistivity R
o
In the formula: L is a spread of electrodes, and S is the rock sample cross-sectional area;
3) start constant speed and constant pressure pump (1), adopt constant voltage mode oil expelling water or gas drive water to oil, water that permeability is equated or gas, water equate permeability; Measuring definite grade of the water yield by electronic balance (7) oozes a little; Close constant speed and constant pressure pump and Haas and rein in clamper endpiece valve, use intelligent LCR measuring instrument (6) measuring resistance r to invariable, measure to wait and oozes a resistance r, calculate etc. and to ooze a resistivity Rwhe;
5) restart constant speed and constant pressure pump (1), adopting the relative permeability of constant voltage mode oil expelling water or gas drive water to water is 0, i.e. the resistivity r of irreducible water saturation Swi is measured in no longer water outlet of endpiece, calculates the resistivity Rwi of irreducible water saturation;
6) calculate WS be 100%, etc. ooze resistance Magnification I under point, these three saturation degree states of irreducible water; Under log-log coordinate, draw the X plot of resistance Magnification I and WS Sw; If WS and resistance Magnification are linear, then power function fitting provides SEXP n.
7. method according to claim 6, preparation plunger rock core comprises: choose, drilling, washing oil, desalinization of soil by flooding or leaching step.
A Bian Shui, Di Shui or etc. salinity inject the measuring method that water gets into the SEXP n of oily reservoir process; This measuring method is used relative permeability and resistivity translocation system, and this system comprises that constant speed and constant pressure pump (1), Haas rein in clamper (5), intelligent LCR measuring instrument (6), electronic balance (7): this measuring method comprises the steps:
1) with the saturated plunger rock core that has prepared of stratum water evacuation pressurization,
2) rock core places Haas to rein in clamper (5), uses intelligent LCR measuring instrument (6) measuring resistance r, calculates WS and be 100% resistivity R
o
3) start the constant speed and constant pressure pump, adopting constant voltage mode oil expelling water or gas drive water to water relative permeability is zero, measures irreducible water saturation S
WiResistivity r under the state
Wi, calculate resistivity R under the irreducible water saturation state
Wi
5) adopt water displacing oil or water drive gas to oil, water two phase relative permeability identical pointses or gas, water two phase relative permeability identical pointses; Close constant speed and constant pressure pump and Haas and rein in clamper endpiece valve; Use intelligent LCR measuring instrument measuring resistance r to invariable, measure to wait and ooze a resistance r
Whe, calculate etc. and to ooze a resistivity R
Whe
6) restart the constant speed and constant pressure pump, continuing water displacing oil or water drive gas is 0 to oil relative permeability, i.e. the irreducible oil state; Measure residual oil saturation S
OrResistivity r under the state
Or, calculate resistivity R under the residual oil saturation state
Or
7) calculate irreducible water, etc. ooze resistance Magnification I under point, these three saturation degree states of remaining oil gas, drafting resistance Magnification I and WS S under log-log coordinate
wX plot, if WS and resistance Magnification are linear, then power function fitting provides SEXP n.
9. method according to claim 8, preparation plunger rock core comprises: choose, drilling, washing oil, desalinization of soil by flooding or leaching step.
10. method according to claim 8, the rock core in the step 3) were done the aging recovery of wettability.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135732A (en) * | 2006-08-31 | 2008-03-05 | 中国石油大学(北京) | Formation fluid saturation degree evaluating method |
| CN101649738A (en) * | 2008-08-13 | 2010-02-17 | 中国石油天然气集团公司 | Method for determining stratum water saturation |
| CN101929973A (en) * | 2009-06-22 | 2010-12-29 | 中国石油天然气股份有限公司 | Quantitative calculation method for hydrocarbon saturation of fractured reservoir |
-
2011
- 2011-04-26 CN CN2011101056405A patent/CN102243196B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101135732A (en) * | 2006-08-31 | 2008-03-05 | 中国石油大学(北京) | Formation fluid saturation degree evaluating method |
| CN101649738A (en) * | 2008-08-13 | 2010-02-17 | 中国石油天然气集团公司 | Method for determining stratum water saturation |
| CN101929973A (en) * | 2009-06-22 | 2010-12-29 | 中国石油天然气股份有限公司 | Quantitative calculation method for hydrocarbon saturation of fractured reservoir |
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| Publication number | Priority date | Publication date | Assignee | Title |
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