CN109025921B - Cover layer sealing performance prediction method for Ordos basin - Google Patents
Cover layer sealing performance prediction method for Ordos basin Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000007789 sealing Methods 0.000 title claims abstract description 23
- 238000006073 displacement reaction Methods 0.000 claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 abstract description 11
- 229910052753 mercury Inorganic materials 0.000 abstract description 9
- 238000011161 development Methods 0.000 abstract description 4
- 238000011158 quantitative evaluation Methods 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 8
- 238000011156 evaluation Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
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- E21B47/00—Survey of boreholes or wells
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- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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Abstract
The invention belongs to the technical field of oil exploitation, and relates to quantitative evaluation of the capping layer sealing performance in the development process of a CCUS project. A method for predicting the closure performance of a cover layer in an Ordos basin comprises the steps of selecting a production well in an area to be evaluated, and reading an initial depth value x of a 4+5 long cover layer on a well logging curve of the production well1And a thickness h; fitting the sound wave time difference curve in a segmented manner, and calculating the sound wave time difference value of the sound wave time difference curve corresponding to the sound wave; and substituting the read thickness value h of the 4+5 long cover layer position and the corresponding sound wave time difference value into a formula, calculating a comprehensive displacement pressure value P, and evaluating the closing performance of the cover layer by P. The prediction method is simple and convenient, and can avoid the problem that a large amount of time and cost are consumed for obtaining the horizontal displacement pressure and the vertical displacement pressure by a high-pressure mercury vapor compression method or a breakthrough pressure method; the method can avoid the inaccuracy caused by measuring the closure of the cover layer by taking the horizontal displacement pressure measured by a high-pressure mercury intrusion method or the vertical displacement pressure measured by breakthrough pressure as an index.
Description
Technical Field
The invention belongs to the technical field of oil exploitation, and relates to quantitative evaluation of the capping layer sealing performance in the development process of a CCUS project.
Background
At the time of the CCUS development, the capping layer was evaluated for its blocking properties to ensure CO2And (5) necessary links of safe sealing. The existing commonly used method for evaluating the sealing performance of the cover layer mostly takes the cover layer displacement pressure as an index, and the higher the displacement pressure is, the better the sealing performance of the cover layer is, and the displacement pressure value is mostly measured by a high-pressure mercury vapor method or a breakthrough pressure method.
However, it is clearly not scientific to measure cap layer closure performance in terms of displacement pressure alone, ignoring the effect of cap layer thickness on it. In addition, the physical property of the rock core in the horizontal direction is superior to that in the vertical direction due to the compaction action of the overlying strata, and mercury generally enters the rock core in the horizontal direction under high pressure, so the displacement pressure measured by the method is more representative of the closure of the cover layer in the horizontal direction, and the displacement pressure obtained by the method is more representative of the closure of the cover layer in the vertical direction due to the directionality of the fluid obtained by the breakthrough pressure method, and the CO is added2The migration direction in the actual cap layer is variable, so that it is not completely accurate to evaluate the sealing performance of the actual cap layer by the displacement pressure obtained by the single high-pressure mercury intrusion method or the breakthrough pressure method.
The rock cores of four wells are respectively utilized to carry out a high-pressure mercury injection experiment and a breakthrough pressure experiment, two kinds of experiments of each well comprise three groups of repeated experiments, the results of the experiments are shown in figure 1, and the experimental test results show that: the repeated test results of the horizontal displacement pressure and the vertical displacement pressure of the four wells have large fluctuation and poor repeatability. To be healdThe calculation result of the combined displacement pressure is not influenced, and the value is only different from the cover layer thickness h and the calculated time difference of the well sound wave
It is related.
In addition, taking the first set of test results as an example, if the horizontal displacement pressure measured by mercury intrusion method is taken as an evaluation index, P isxA>PxB>PxD>PxCThe sequence of the sealing performance of the four well cover layers from good to bad is A well, B well, D well and C well; if the vertical displacement pressure measured by the breakthrough pressure method is taken as an index, P is availableyB>PyC>PyA>PyDThe sealing performance of the four well covers is illustrated to be in a good-to-poor sequence of a well B, a well C, a well A and a well D, and the results of the evaluation of the sealing performance of the cover obtained by the evaluation of the two indexes are quite different, so that only P is used for evaluating the sealing performance of the coverxOr PyThe method of evaluating the closure of the regional cap layer for a single evaluation index is not accurate.
In addition, it takes a lot of time and is expensive to obtain a plurality of horizontal displacement pressures and vertical displacement pressures through experiments.
Disclosure of Invention
The invention aims to solve the problems and provides a method for predicting the capping performance of an Ordos basin, which is mainly used for calculating and developing CO2The sealing performance of the upper covering layer in the oil displacement, sealing and utilization (CCUS) process is used for evaluating the safety of project development.
The technical scheme of the invention is as follows:
a method for predicting the covering layer sealing performance of an Ordos basin comprises the following steps:
step 1: selecting a production well of an area to be evaluated, measuring a logging curve of the production well, and reading an initial depth value x of the 4+5 long cover layer on the logging curve1And its thickness h;
step 2: fitting the acoustic wave time difference curve in the well logging curve in a segmented manner to obtain each segmented fitting function f1(x)、f2(x)、f3(x)…fn(x) And each segmentDepth difference value deltah corresponding to function1、Δh2、Δh3…Δhn(ii) a Calculating the sound wave time difference value corresponding to the sound wave time difference curve of each well by the following formula
Wherein f isi(x) Representing the i-th acoustic time difference curve function, Δ h, of the acoustic time difference curveiRepresenting the corresponding acoustic time difference function fi(x) The depth difference of (d);
and step 3: the read thickness value h of the 4+5 long cover layer bit and the corresponding acoustic wave time difference value
Substituting the pressure value P into the following formula, calculating a comprehensive displacement pressure value P, and evaluating the sealing performance of the cover layer by using P, wherein the larger the value of P is, the better the sealing performance of the cover layer in the area is;
wherein
h＝Δh1+Δh2+…+Δhn(3)。
The invention has the technical effects that:
the method for predicting the cover layer sealing performance of the Ordos basin is simple and convenient, and can avoid the problem that a large amount of time and cost are consumed when the horizontal displacement pressure and the vertical displacement pressure are obtained through a high-pressure mercury pressing method or a breakthrough pressure method; the method can avoid the inaccuracy caused by measuring the closure of the cover layer by taking the horizontal displacement pressure measured by a high-pressure mercury intrusion method or the vertical displacement pressure measured by breakthrough pressure as an index.
Drawings
FIG. 1 shows a horizontal displacement pressure P in the background of the inventionxAnd (4) a result graph of a high-pressure mercury injection experiment is carried out.
FIG. 2 is a diagram of the vertical displacement pressure P in the background art of the present inventionyAnd (5) carrying out a result graph of a breakthrough pressure experiment.
FIG. 3 is a graph of sonic moveout for well A in an embodiment of the present invention.
Fig. 4 is a graph comparing the error in the method provided by the present invention and the empirical formula (4).
Detailed Description
Step 1: selecting A, B, C, D four wells as evaluation objects, wherein the 4 wells are the same as 4 wells in the background technology;
taking A well as an example, the well logging curve is measured to obtain the initial depth value x of the long 4+5 cover layer11183.5m, thickness h 85.3 m.
Step 2: the sound wave time difference curve is segmented to carry out function fitting to obtain a fitting function f1(x)、f2(x)、f3(x)…fn(x) And the depth difference value delta h corresponding to each segment functioniWherein f is1(x)、f2(x)、f3(x)…fn(x) Corresponding depth difference values are respectively delta h1、Δh2、Δh3…Δhn。
To illustrate, f in the fitting function1(x)、f2(x)、f3(x) Respectively as follows:
f1(x)＝5×10184e-0.355x；
f2(x)＝-117.43x2+278371x-2×108；
f3(x)＝-0.1726x6+1230x5-4×106x4+6×109x3-5×1012x2+2×1015x-5×1017；
calculating the corresponding sound wave time difference value of the sound wave time difference curve of each well
Comprises the following steps:
and step 3: substituting the thickness value and the corresponding sound wave time difference value into the following formula, calculating a comprehensive displacement pressure value P, and evaluating the sealing performance of the cover layer by using P, wherein the larger the value of P is, the better the sealing performance of the cover layer in the region is;
according to the same principle, the B, C, D four well thickness values h are 82.8m, 84.7m and 85.6m respectively, and the corresponding sound wave time difference values
227.83 μ s/m, 224.39 μ s/m and 221.65 μ s/m, respectively. The comprehensive displacement pressure values P are respectively 11.44MPa, 11.70MPa and 12.35 MPa.
Comparing the comprehensive displacement pressure values of four wells in the area, PD>PA>PC>PBThe method is characterized in that the sealing performance of the cover layer near the four wells is sequentially from good to bad, namely a well D, a well A, a well C and a well B, and compared with indexes measured by a mercury intrusion method and a breakthrough pressure method in the background art, the results are different.
The P value is in positive correlation with the thickness h of the cover layer and in inverse correlation with the sound wave time difference △ t, the larger the thickness of the cover layer is, the more difficult the fluid flows out of the cover layer, and the better the closure of the cover layer is, the smaller the sound wave time difference △ t is, the more compact the rock is, the more difficult the fluid flows out of the cover layer, and the better the closure of the cover layer is, so the larger the P value is, the better the closure of the cover layer is, and the value range of the P value is 11.42-91.32 MPa.
At present, an empirical formula is mostly adopted for calculating the cap layer displacement pressure, and the formula (4) is generally considered to be more accurate:
P＝70/(0.075Δt-12.5)-4.2 (4)
the displacement pressure of A, B, C, D near the four wells is calculated by formula (4) as follows: 11.69MPa, 11.06MPa, 11.70MPa and 12.77 MPa. I.e., the relative error between the integrated displacement pressure calculated by the method herein and the result calculated by equation (4) is not more than 5%, see fig. 4. The method for predicting the closure of the cover layer by taking the comprehensive displacement pressure as the closure evaluation index of the cover layer is accurate.
Claims (1)
1. A method for predicting the capping performance of an Ordos basin is characterized in that: the method comprises the following steps:
step 1: selecting a production well of an area to be evaluated, measuring a logging curve of the production well, and reading an initial depth value x of the 4+5 long cover layer on the logging curve1And its thickness h;
step 2: fitting the acoustic wave time difference curve in the well logging curve in a segmented manner to obtain each segmented fitting function f1(x)、f2(x)、f3(x)…fn(x) And the depth difference value delta h corresponding to each segment function1、Δh2、Δh3…Δhn(ii) a Calculating the sound wave time difference value corresponding to the sound wave time difference curve of each well by the following formula
Wherein f isi(x) Representing the i-th acoustic time difference curve function, Δ h, of the acoustic time difference curveiRepresenting the corresponding acoustic time difference function fi(x) The depth difference of (d);
and step 3: the read thickness value h of the 4+5 long cover layer bit and the corresponding acoustic wave time difference value
Substituting the pressure value P into the following formula, calculating a comprehensive displacement pressure value P, and evaluating the sealing performance of the cover layer by using P, wherein the larger the value of P is, the better the sealing performance of the cover layer in the area is;
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| EP2659337A1 (en) * | 2010-12-31 | 2013-11-06 | Nokia Corp. | A display apparatus producing audio and haptic output |
| CN104965979A (en) * | 2015-06-16 | 2015-10-07 | 中国石油化工股份有限公司 | Tight sandstone effective reservoir identifying method |
| CN106948811A (en) * | 2017-03-28 | 2017-07-14 | 中国石油大学(北京) | Superimposed Basins dense carbonate cap rock covers the quantitatively characterizing method of performance |
| CN107066749A (en) * | 2017-04-25 | 2017-08-18 | 西安石油大学 | A kind of method that quantitative assessment Seam Roof And Floor covers performance |
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