CN115372197A - Evaluation method for quantifying clay imbibition oil displacement effect based on imbibition-ion diffusion lag time - Google Patents
Evaluation method for quantifying clay imbibition oil displacement effect based on imbibition-ion diffusion lag time Download PDFInfo
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- 238000005213 imbibition Methods 0.000 title claims abstract description 105
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 73
- 238000009792 diffusion process Methods 0.000 title claims abstract description 48
- 230000000694 effects Effects 0.000 title claims abstract description 48
- 239000004927 clay Substances 0.000 title claims abstract description 43
- 238000011156 evaluation Methods 0.000 title claims abstract description 20
- 239000011435 rock Substances 0.000 claims abstract description 66
- -1 salt ions Chemical class 0.000 claims abstract description 44
- 230000008859 change Effects 0.000 claims abstract description 33
- 238000010521 absorption reaction Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 11
- 230000008961 swelling Effects 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 7
- 239000000725 suspension Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000011002 quantification Methods 0.000 claims 2
- 230000007547 defect Effects 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000036962 time dependent Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses an evaluation method for quantifying clay imbibition oil displacement effect based on imbibition-ion diffusion lag time, which comprises the following steps: completely immersing the dried rock core in the imbibition solution, and monitoring the water absorption quality of the rock core and the concentration of salt ions in the imbibition solution in real time until the water absorption quality of the rock core and the concentration of the salt ions in the imbibition solution are stable; normalizing the data of the change of the water absorption quality of the rock core along with the time and drawing to obtain a curve of the change of the normalized rock core imbibition amount along with the time; normalizing the data of the salt ion concentration in the imbibition solution along with the change of time and drawing to obtain a curve of the salt ion diffusion quantity in the normalized imbibition solution along with the change of time; and calculating the oil displacement strength by using the data of the two curves, and evaluating the oil displacement effect of the clay by absorbing and expanding. The method overcomes the defect that the conventional imbibition oil displacement evaluation method cannot evaluate the oil displacement effect of clay imbibition, and achieves the aim of quantifying the oil displacement effect of clay imbibition by imbibition-ion diffusion lag time.
Description
Technical Field
The invention belongs to the field of petroleum engineering natural gas development, is mainly used for evaluating an oil displacement effect, and particularly relates to an evaluation method for quantifying a clay imbibition oil displacement effect based on imbibition-ion diffusion lag time.
Background
With the shortage of oil and gas resources, the research and development of efficient unconventional oil and gas resources, particularly compact oil resource technology, is imperative.
Because tight reservoirs are usually extremely low in porosity and permeability, pore throat structures are very complex, and conventional production methods cannot be completely applied to development of the reservoirs. The capillary force phenomenon is very obvious based on the tiny pore throats, and the method which is proposed in recent years and uses the capillary force as the driving force to enable fluid in cracks to enter rocks so as to displace oil gas in rock pores is very effective for exploiting compact oil reservoirs, and the exploiting mode is a so-called imbibition oil extraction mode.
The method can accurately and effectively evaluate the oil displacement effect in the imbibition process, and is an important precondition for scientifically formulating a reasonable production system and developing the maximum benefit. By researching the prior art, the conventional imbibition oil displacement evaluation method mainly comprises an imbibition volume method and an imbibition mass method. However, in the two methods, certain differences exist between the ionic change caused by the absorption and swelling of clay and the permeation of fracturing fluid into a reservoir through a porous medium, namely the conventional method does not consider the diffusion of salt ions, so that the absorption and swelling oil displacement effect of clay cannot be accurately and quantitatively evaluated.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an evaluation method for quantifying the oil displacement effect of clay imbibition based on imbibition-ion diffusion lag time.
The technical scheme adopted by the invention is as follows:
an evaluation method for quantifying clay imbibition oil displacement effect based on imbibition-ion diffusion lag time comprises the following steps:
completely immersing the dried rock core in the imbibition solution, and monitoring the water absorption quality of the rock core and the concentration of salt ions in the imbibition solution in real time until the water absorption quality of the rock core and the concentration of the salt ions in the imbibition solution are stable;
normalizing the data of the change of the water absorption quality of the rock core along with the time and drawing to obtain a curve of the change of the normalized rock core imbibition amount along with the time;
normalizing the data of the salt ion concentration in the imbibition solution along with the time change and drawing to obtain a curve of the salt ion diffusion quantity in the normalized imbibition solution along with the time change;
and calculating the oil displacement strength of the oil reservoir by utilizing the balance value of the curve of the change of the seepage capacity of the normalized rock core along with the time, the balance value of the curve of the change of the diffusion capacity of salt ions in the normalized seepage solution along with the time, the time point when the water absorption quality of the rock core is stable and the time point when the concentration of the salt ions in the seepage solution is stable, and evaluating the oil displacement effect of the clay by absorbing according to the oil displacement strength of the oil reservoir.
Preferably, the calculation formula of the swelling oil displacement strength is as follows:
in the formula, N i The balance value is a decimal of a balance value of a curve of the seepage and suction amount of the normalized rock core along with the change of time; n is a radical of d Normalizing the balance value of a curve of the diffusion capacity of the salt ions in the imbibition solution along with the change of time, wherein the balance value is decimal; t is a unit of 1 The unit is h, and the time point is the time point when the water absorption quality of the rock core is stable; t is 2 : the time point when the concentration of the salt ions in the imbibition solution is stable is h; t is a unit of o ＝T 2 -T 1 ，T o The unit is h for the oil displacement time by suction expansion; d o : the absorption swelling oil displacement strength is h -1 。
Preferably, when the oil displacement effect of the clay by suction expansion is evaluated according to the oil displacement intensity by suction expansion: the higher the value of the oil displacement strength of the oil displacement by suction, the better the oil displacement effect of the oil displacement by suction of the clay.
Preferably, the core is dried and dehydrated, and the dried core is obtained after the core reaches a constant weight.
Preferably, the process of completely immersing the dried rock core in the imbibition solution and monitoring the water absorption quality of the rock core and the concentration of salt ions in the imbibition solution in real time comprises the following steps:
the rock core is suspended on an analytical balance by using a suspension line which is not elastic and does not penetrate the imbibition solution, the rock core is vertically suspended in a container containing the imbibition solution, the liquid level in the container is adjusted to enable the rock core to be completely immersed in the imbibition solution, the water absorption quality of the rock core is monitored in real time by the analytical balance, and meanwhile, the salt ion concentration in the imbibition solution is monitored in real time by a conductivity measuring instrument.
Preferably, the analytical balance has a measurement accuracy of not less than 0.00001g; the diameter of the suspension wire is not more than 0.13mm.
Preferably, the resolution of the conductivity measuring instrument is 0.1-2000 mu S/cm.
Preferably, the dried rock core is completely immersed in the imbibing solution, and the process of monitoring the water absorption quality of the rock core and the concentration of salt ions in the imbibing solution in real time is carried out in a constant-temperature constant-humidity environment.
The invention has the following beneficial effects
Due to the fact that certain difference exists between the ion change caused by the clay imbibition effect and the fact that fracturing fluid is imbibed into a reservoir through a porous medium, the method achieves the purpose of quantifying the oil displacement effect under the clay imbibition effect by considering the difference between an imbibition curve and an ion diffusion curve, is simple to operate, and has important significance for unconventional reservoir imbibition extraction and qualitative evaluation of the oil displacement effect.
Drawings
FIG. 1 is a schematic flow diagram of an evaluation method for quantifying the oil displacement effect of clay imbibition based on the imbibition-ion diffusion lag time according to the present invention;
FIG. 2 is a schematic diagram of experimental data processing and analysis flow in the method for quantifying the oil displacement effect of clay imbibition based on imbibition-ion diffusion lag time according to the present invention;
FIG. 3 (a) is a graph of normalized imbibition and normalized salt ion diffusion for cores A1 of examples of the invention as a function of time, and FIG. 3 (b) is a graph of normalized imbibition and normalized salt ion diffusion for cores A2 of examples of the invention as a function of time.
Detailed Description
The technical solution of the present invention is further specifically explained below by referring to the drawings and examples, but the present invention is not limited to the examples.
The invention aims to provide an evaluation method and a system for quantifying the oil displacement effect of clay imbibition based on imbibition-ion diffusion lag time, based on the imbibition principle, by drawing a normalized rock core imbibition amount time-dependent curve (namely a liquid amount change curve of fluid flowing into a rock core under the action of capillary force) and a normalized imbibition solution salt ion diffusion amount time-dependent curve (namely a salt ion change curve of fluid flowing out of the rock core under the action of concentration difference), and can be used for quantifying the oil displacement effect of clay imbibition on the premise of considering the salt ion diffusion lag effect.
Referring to fig. 1, the evaluation method for quantifying the oil displacement effect of clay imbibition based on imbibition-ion diffusion lag time comprises the following steps:
s1, firstly, measuring and recording the original size and mass of a rock core before an experiment, and drying a rock core sample in a constant temperature box at 105 ℃ until the mass of the rock core sample does not change any more;
s2, suspending the core on a high-precision analytical balance by using an inelastic impermeable thin wire, vertically suspending the core in a beaker filled with imbibition liquid, and adjusting the liquid level to ensure that the core sample suspended on the thin wire is completely immersed in the imbibition liquid;
s3, inserting the detection end of the conductivity measuring instrument into the imbibing solution while recording the water absorption mass of the rock core by the balance, realizing dynamic monitoring of the salt ion concentration, and recording the change of the water absorption mass of the rock core along with time and the change of the salt ion diffusion amount along with time;
s4, taking out the rock core after the water absorption quality of the rock core and the diffusion quantity of salt ions in the imbibition solution reach stable values, and quantifying the oil displacement effect of clay imbibition through water absorption quality balance and ion diffusion balance lag time;
and S5, finally, because the water absorption quality of the rock core and the salt ion diffusion amount in the imbibition solution are not in an order of magnitude, normalization treatment needs to be carried out on the rock core and the imbibition solution, and the oil displacement effect of clay imbibition is analyzed.
Referring to fig. 2, fig. 3 (a) and fig. 3 (b), in S5, the process of processing the experimental data and analyzing the oil displacement effect of clay swelling includes the following steps:
s5.1, drawing a curve I of the normalized rock core imbibition amount along with time and a curve II of the normalized imbibition solution along with time, and reflecting the oil displacement effect of clay imbibition through the curve difference of the normalized rock core imbibition amount and the curve I of the normalized imbibition solution along with time.
S5.2, recording the balance value of the normalized rock core imbibition amount time-dependent curve I as N i And the equilibrium value of the curve II of the diffusion quantity of the salt ions in the normalized imbibition solution with the change of time is recorded as N d And recording the dynamic balance time point of core imbibition as T 1 And the dynamic equilibrium time point of the salt ion diffusion in the imbibition solution is recorded as T 2 。
Oil displacement time T by suction expansion o ＝T 2 -T 1 (ii) a Strength of oil displacement by suction expansion
Oil displacement intensity D o The higher the oil displacement effect, the better the clay swelling oil displacement effect.
Wherein, N i : normalizing the balance value and decimal of the curve I of the change of the rock core imbibition with time; n is a radical of d : normalizing the balance value and decimal of the diffusion quantity of the salt ions in the imbibition solution along with the change of the time curve II; t is 1 : a dynamic balance time point of core imbibition, h; t is 2 : a time point of dynamic equilibrium of salt ion diffusion in the imbibition solution, h; t is o : absorbing oil displacement time, h; d o : swelling oil displacement intensity, h -1 。
Examples
The evaluation method for quantifying the oil displacement effect of clay imbibition based on the imbibition-ion diffusion lag time is developed for the A1 core and the A2 core respectively, and comprises the following steps (in the following experiment process, experimental equipment is placed in a constant temperature and humidity box, so that the experiment disturbance caused by temperature, humidity and air flow is avoided):
firstly, measuring and recording the original size and mass of a rock core before an experiment, and drying a rock core sample in a constant temperature box at 105 ℃ until the mass of the rock core sample does not change any more, such as S1 in figure 1;
secondly, suspending the core on a high-precision analytical balance by using an inelastic impermeable thin wire, vertically suspending the core in a beaker filled with imbibition liquid, and adjusting the liquid level height to ensure that the core sample suspended on the thin wire is completely immersed in the imbibition liquid, as shown in S2 in the figure 1; in the embodiment, a high-precision analytical balance Mettle XPF205 is adopted, and the measurement precision of the high-precision analytical balance Mettle XPF205 reaches 0.00001g; the sample is suspended by using an inelastic and impermeable thin wire with the diameter of 0.13mm, so that the influence on the experimental result due to the liquid level drop is avoided;
step three, inserting the detection end of the conductivity measuring instrument into the imbibing solution while recording the water absorption mass of the rock core by the balance, realizing dynamic monitoring of the salt ion concentration, and recording the change of the water absorption mass of the rock core along with time and the change of the salt ion diffusion amount along with time, such as S3 in the figure 1; in the embodiment, the conductivity of the solution is monitored by using a multi-functional conductivity measuring instrument of Mettler Seven Excellence, and the resolution ratio is 0.1-2000 mu S/cm;
taking out the rock core after the water absorption quality of the rock core and the diffusion quantity of salt ions in the imbibition solution reach stable values, and quantifying the oil displacement effect of clay imbibition through water absorption quality balance and ion diffusion balance lag time, such as S4 in the figure 1;
and step five, processing and analyzing the experimental data, such as S5 in FIG. 1. Respectively drawing a curve I of the normalized rock core imbibition amount along with time, a curve II of the normalized imbibition solution along with time, and reflecting the oil displacement effect of clay imbibition through the curve difference of the curve I and the curve II, as shown in the figure 3 (a) and the figure 3 (b).
The results of the curves show: the normalized imbibition curves of the A1 core and the A2 core along with the time and the normalized salt ion diffusion quantity along with the time have significant differences, and the following table 1 indicates the relevant data of the A1 core and the A2 core.
TABLE 1
| A1 | A2 | |
| Normalized imbibition quantity balance value N i | 0.91 | 0.89 |
| Normalized ion diffusion balance value N d | 0.79 | 0.35 |
| Imbibition dynamic equilibrium time point T 1 | 20.33 | 19.21 |
| Dynamic equilibrium time point T of ion diffusion 2 | 57.26 | 24.47 |
| Time to drive oil T o | 36.93 | 5.26 |
| Oil displacement intensity D o | 0.003 | 0.103 |
The calculation shows that the oil displacement strength of the A2 core is 0.103h -1 While the oil displacement strength of the A1 core is only 0.003h -1 Therefore, the clay swelling oil displacement effect of the A2 rock core is better.
According to the scheme, the defect that the conventional imbibition flooding evaluation method cannot evaluate the oil displacement effect of clay imbibition is overcome, and the purpose of quantifying the oil displacement effect of clay imbibition by imbibition-ion diffusion lag time is achieved.
The above description is only an example of the present invention, and any person skilled in the art may modify the above technical solution. Therefore, any simple modifications or equivalent substitutions made according to the technical solution of the present invention belong to the scope of the claims of the present invention.
Claims (8)
1. An evaluation method for quantifying clay imbibition oil displacement effect based on imbibition-ion diffusion lag time is characterized by comprising the following steps:
completely immersing the dried rock core in an imbibition solution, and monitoring the water absorption quality of the rock core and the concentration of salt ions in the imbibition solution in real time until the water absorption quality of the rock core and the concentration of the salt ions in the imbibition solution are stable;
normalizing the data of the change of the water absorption quality of the rock core along with the time and drawing to obtain a curve of the change of the normalized rock core imbibition amount along with the time;
normalizing the data of the salt ion concentration in the imbibition solution along with the change of time and drawing to obtain a curve of the salt ion diffusion quantity in the normalized imbibition solution along with the change of time;
and calculating the oil displacement strength of the oil reservoir by utilizing the balance value of the curve of the change of the seepage capacity of the normalized rock core along with the time, the balance value of the curve of the change of the diffusion capacity of salt ions in the normalized seepage solution along with the time, the time point when the water absorption quality of the rock core is stable and the time point when the concentration of the salt ions in the seepage solution is stable, and evaluating the oil displacement effect of the clay by absorbing according to the oil displacement strength of the oil reservoir.
2. The evaluation method for quantifying the oil displacement effect of the clay swelling based on the imbibition-ion diffusion lag time as recited in claim 1, wherein the calculation formula of the oil displacement strength of the swelling is as follows:
in the formula, N i The balance value is a decimal balance value of a curve of the change of the seepage capacity of the normalized rock core along with time; n is a radical of d Normalizing the balance value of the curve of the diffusion quantity of the salt ions in the imbibition solution along with the change of time, wherein the balance value is decimal; t is 1 The unit is h, and the time point is the time point when the water absorption quality of the rock core is stable; t is 2 : the time point when the concentration of the salt ions in the imbibing solution is stable is h; t is o ＝T 2 -T 1 ，T o The unit is the oil displacement time of imbibition, and is h; d o : the absorption swelling oil displacement strength is h -1 。
3. The evaluation method for quantifying the oil displacement effect of the clay swelling based on the imbibition-ion diffusion lag time as claimed in claim 1, wherein when the oil displacement effect of the clay swelling is evaluated according to the oil displacement intensity of the swelling: the higher the value of the oil displacement strength of the oil displacement by suction, the better the oil displacement effect of the oil displacement by suction of the clay.
4. The evaluation method for quantifying the clay imbibition oil displacement effect based on the imbibition-ion diffusion lag time as claimed in claim 1, wherein the dry core is obtained by drying and removing water from the core until the core reaches a constant weight.
5. The evaluation method for quantifying the clay imbibition oil displacement effect based on the imbibition-ion diffusion lag time as claimed in claim 1, wherein the process of completely immersing the dried rock core in the imbibition solution and monitoring the water absorption quality of the rock core and the concentration of salt ions in the imbibition solution in real time comprises the following steps:
the method comprises the following steps of suspending a rock core on an analytical balance by using a suspension line which is inelastic and does not penetrate a imbibition solution, vertically suspending the rock core in a container containing imbibition solution, adjusting the height of a liquid level in the container to enable the rock core to be completely immersed in the imbibition solution, monitoring the imbibition quality of the rock core in real time through the analytical balance, and monitoring the concentration of salt ions in the imbibition solution in real time through a conductivity measuring instrument.
6. The method for evaluating the effect of clay imbibition flooding based on the imbibition-ion diffusion lag time quantification of claim 5, wherein the measurement accuracy of an analytical balance is not lower than 0.00001g; the diameter of the suspension wire is not more than 0.13mm.
7. The method for evaluating the effect of clay imbibition and oil displacement based on the imbibition-ion diffusion lag time quantification of claim 5, wherein the resolution of the conductivity measuring instrument is 0.1 to 2000 μ S/cm.
8. The evaluation method for quantifying the clay imbibition oil displacement effect based on the imbibition-ion diffusion lag time as claimed in claim 1, wherein the dry rock core is completely immersed in the imbibition solution, and the process of monitoring the water absorption quality of the rock core and the concentration of salt ions in the imbibition solution in real time is carried out in a constant temperature and humidity environment.
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