CN-121997519-A - Method, device, equipment and storage medium for predicting shale oil imbibition efficiency

CN121997519ACN 121997519 ACN121997519 ACN 121997519ACN-121997519-A

Abstract

The present disclosure relates to the field of unconventional shale oil and gas reservoir exploration technologies, and in particular, to a method, apparatus, device, and storage medium for predicting shale oil imbibition efficiency. According to the oil seepage and extraction efficiency characterization method, the content of oil in different pore-size intervals after the saturated oil is pressurized by the core is rapidly quantified through the two-dimensional nuclear magnetic resonance technology under the condition of not damaging the core, and then the respective oil seepage and extraction efficiency function and the whole critical lower limit of the different pore-size intervals of the shale oil under the stratum condition established by the method are utilized, so that the oil seepage and extraction efficiency of the whole shale oil core can be rapidly, accurately and quantitatively characterized. The method can be used for rapidly, accurately and uninjured determination of the efficiency for shale oil core imbibition under the condition of no harm to the core, and provides an effective means for revealing interaction reaction mechanism of shale oil reservoir rock and injection medium, oil extraction mechanism of shale oil reservoir rock Dan Shenxi, oil recovery mechanism of shale oil reservoir improvement and the like. The method has important engineering value and scientific significance for promoting the effective economic development of shale reservoirs in China.

Inventors

TANG JIEYUN
XU MINGZI
GAO YANG
LU FANG
Dong Zuhua
Bi Wanting
DONG XIAOYU
ZHANG XIANGYU
LU YINLONG
FU WEI
CUI XIANGDONG
ZHANG SHUTIAN
JIANG MEIZHONG
ZHANG HONG
SUN SHIQIANG

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241106

Claims (20)

1. A method of predicting efficiency for shale oil imbibition, the method comprising: Drilling a shale oil sample in a region to be measured, establishing a sample two-dimensional nuclear magnetic template, and determining a sample saturated oil signal quantity; Determining the oil signal quantity after the sample imbibition according to the comprehensive imbibition efficiency curve and the sample saturated oil signal quantity; And calculating to obtain the shale oil imbibition efficiency of the area to be measured according to the saturated oil signal quantity of the sample and the oil signal quantity after imbibition of the sample.
2. A method of predicting shale oil imbibition efficiency as set forth in claim 1, wherein, The comprehensive imbibition efficiency curve is obtained by the following method: Preparing a plurality of rock samples with different physical characteristics; Respectively measuring two-dimensional nuclear magnetism of a plurality of rock samples to establish a two-dimensional nuclear magnetism template of the rock samples, and dividing a plurality of seepage areas; Determining a saturated oil signal quantity and a imbibition oil signal quantity based on a rock sample two-dimensional nuclear magnetic template; and respectively establishing comprehensive imbibition efficiency curves for a plurality of imbibition areas according to the saturated oil signal quantity and the imbibition oil signal quantity.
3. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, Measuring the two-dimensional nuclear magnetism of a plurality of rock samples respectively to establish a rock sample two-dimensional nuclear magnetism template, comprising: Washing and drying the sample, measuring two-dimensional nuclear magnetism, and determining the positions of kerogen, clay bound water and structural water.
4. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, Respectively measuring two-dimensional nuclear magnetism on a plurality of rock samples to establish a rock sample two-dimensional nuclear magnetism template, and further comprising: Washing the sample with oil and saturated water, measuring the two-dimensional nuclear magnetism, and determining the position of the water.
5. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, Respectively measuring two-dimensional nuclear magnetism on a plurality of rock samples to establish a rock sample two-dimensional nuclear magnetism template, and further comprising: And (3) washing oil and saturated water of the sample, performing centrifugal treatment, and determining the position of the bound water through two-dimensional nuclear magnetism after centrifugation.
6. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, Respectively measuring two-dimensional nuclear magnetism on a plurality of rock samples to establish a rock sample two-dimensional nuclear magnetism template, and further comprising: And drying the sample, saturating the oil, measuring the two-dimensional nuclear magnetism, and determining the position of the oil.
7. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, Respectively measuring two-dimensional nuclear magnetism on a plurality of rock samples to establish a rock sample two-dimensional nuclear magnetism template, and further comprising: And drying the sample, saturating the oil, centrifuging, measuring the two-dimensional nuclear magnetism, and determining the position of the movable oil.
8. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, Dividing a plurality of imbibition areas, including: And dividing the imbibition area on the two-dimensional nuclear magnetic pattern plate according to the ratio of T 1 、T 2 to T 1 /T 2 of different imbibition areas.
9. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, Determining a saturated oil signal and a imbibition post-oil signal, comprising: Loading the core after oil washing into a piston container, vacuumizing for M1 hours, saturating simulated shale oil under the pressure K, placing an incubator for aging for M2 hours, and taking out the core for weighing; The method comprises the steps of measuring a T 1 spectrum and a T 2 spectrum of saturated oil by adopting two-dimensional nuclear magnetic resonance on the premise of not damaging a rock core, dividing an oil-water area on a two-dimensional nuclear magnetic pattern plate, selecting an oil signal display area containing bound oil and mesoporous oil, and quantifying oil signal amounts W x, saturation in different aperture spaces under the state of saturated oil of each rock core by software, wherein x is a T 2 coordinate value.
10. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, Determining the saturated oil signal quantity and the imbibition oil signal quantity, further comprising: Placing a saturated oil core into a piston container, adding a imbibition medium, placing the piston container into an incubator to be set to the stratum temperature and pressurizing to the reservoir pressure to carry out imbibition experiments, taking out the core after the experiment D1 days, weighing, and testing the imbibition T 1 spectrum and the imbibition T 2 spectrum by using a two-dimensional nuclear magnetic resonance technology; The software quantifies the oil signal quantity W x, After imbibition in different aperture spaces after imbibition of each rock core, wherein x is a T 2 coordinate value.
11. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, According to the saturated oil signal quantity and the imbibition oil signal quantity, respectively establishing comprehensive imbibition efficiency curves for a plurality of imbibition areas, wherein the comprehensive imbibition efficiency curves comprise: Calculating imbibition efficiency I of the same T 2 position of the same imbibition area; Respectively establishing one-dimensional functional relations of respective apertures T 2 and imbibition efficiency I for different imbibition areas, and obtaining different T 2 coordinate imbibition efficiency curves of different imbibition areas of each rock sample according to the one-dimensional functional relations; Based on the imbibition efficiency curve, the imbibition rates of shale oil cores with different physical property levels are integrated to obtain the comprehensive imbibition efficiency curve of different T 2 coordinates of different imbibition areas of shale oil in the target area.
12. A method of predicting shale oil imbibition efficiency as set forth in claim 11, wherein, Calculating the imbibition efficiency I of the same T 2 position of the same imbibition area comprises the following steps: Summing oil signal quantities of the same imbibition region at the same T 2 position, obtaining a saturated oil signal quantity W x①, saturation of the first imbibition region according to the saturated oil signal quantity W x, saturation , and obtaining an imbibition oil signal quantity W x①, After imbibition of the first imbibition region according to the imbibition oil signal quantity W x, After imbibition , wherein the numeral ① represents the imbibition region; And calculating the calculated imbibition efficiency of the same T 2 position of the first imbibition region according to the saturated oil signal quantity W x①, saturation of the first imbibition region and the imbibition oil signal quantity W x①, After imbibition of the first imbibition region, and operating the same other imbibition regions to obtain imbibition efficiency of the same T 2 position of different imbibition regions.
13. A method of predicting shale oil imbibition efficiency as set forth in claim 12, wherein, The calculated imbibition efficiency of the same T 2 position of the first imbibition region is calculated according to the saturated oil signal quantity W x①, saturation of the first imbibition region and the oil signal quantity W x①, After imbibition after imbibition of the first imbibition region, and the calculated imbibition efficiency comprises the following steps: The imbibition rate of each oil signal position of different T 2 coordinates in the two-dimensional nuclear magnetic resonance chart is calculated by the following formula: I x ＝(W x①, saturation -W x①, After imbibition )/W x①, saturation ; Wherein I x represents the imbibition value of the rock sample at the point T 2 =x, W x①, After imbibition represents the imbibition oil signal quantity at the point T 2 =x of the first imbibition region, and W x①, saturation represents the oil signal quantity at the saturated oil state at the point T 2 =x of the first imbibition region.
14. A method of predicting shale oil imbibition efficiency as set forth in claim 11, wherein, Based on the imbibition efficiency curve, the imbibition rates of shale oil cores with different physical property levels are integrated, and the method comprises the following steps: The method comprises the steps of (1) averaging or weighting and averaging the imbibition efficiency of shale oil cores with different physical property grades at the same T 2 position to obtain comprehensive imbibition efficiency; And establishing a comprehensive imbibition efficiency curve according to the corresponding relation between the T 2 position and the comprehensive imbibition efficiency.
15. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, Drilling a shale oil sample in a region to be measured, establishing a sample two-dimensional nuclear magnetic template, and determining a sample saturated oil signal quantity, wherein the method comprises the following steps: And (3) drilling a shale oil sample in a target area, measuring a sample T 1 spectrum and a sample T 2 spectrum by adopting a two-dimensional nuclear magnetic resonance technology on the premise of not damaging a rock core, and quantifying oil signal quantity sample saturated oil signal quantity W x, Sample of in different aperture spaces under the state of the rock core sample by software, wherein x is a T 2 coordinate value.
16. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, Determining the oil signal quantity after the sample imbibition according to the comprehensive imbibition efficiency curve and the sample saturated oil signal quantity, comprising: dividing a plurality of imbibition areas according to T 1 、T 2 、T 1/ T 2 critical values of different imbibition areas based on a sample two-dimensional nuclear magnetic template; Adding the saturated oil signal quantity of the sample at the same T 2 position in different imbibition areas to obtain the saturated oil signal quantity of the sample at the T 2 position; And obtaining the oil signal quantity after imbibition of the sample at the position T 2 according to the comprehensive imbibition efficiency curve and the saturated oil signal quantity of the sample at the position T 2 .
17. The method for predicting shale oil imbibition efficiency of claim 16, Obtaining the oil signal quantity after imbibition of the sample at the position T 2 according to the comprehensive imbibition efficiency curve and the saturated oil signal quantity of the sample at the position T 2 , and further comprising: The oil signal W x, After imbibition after T 2 coordinate imbibition is calculated, and the formula is as follows: W x, After imbibition ＝W x, Sample of ×(1-I x ); wherein I x represents the value of the bleed of the sample at T 2 =x, W x, Sample of represents the saturated oil signal at T 2 =x, and W x, After imbibition represents the oil signal at T 2 =x after bleed.
18. A method of predicting shale oil imbibition efficiency as set forth in claim 2, wherein, According to the saturated oil signal quantity of the sample and the oil signal quantity after the imbibition of the sample, the shale oil imbibition efficiency of the area to be measured is calculated, and the method comprises the following steps: Summing the saturated oil signal quantity data of all samples to obtain W Sum total , Sample of ; Summing the oil signal quantity data after imbibition of all samples to obtain W Sum total , After imbibition ; The oil signal amount sum W Sum total , Sample of of the sample saturated oil and the oil signal amount sum W Sum total , After imbibition of the shale oil core after imbibition are used for calculating the imbibition efficiency I of the shale oil core, and the formula is as follows: I=(W Sum total , Sample of -W Sum total , After imbibition )/W Sum total , Sample of ; Wherein W Sum total , Sample of represents the sum of saturated oil signal amounts of the sample, W Sum total , After imbibition represents the sum of oil signal amounts of the shale oil core after imbibition, and I represents the imbibition efficiency of the sample.
19. The device for predicting the shale oil imbibition efficiency is characterized by comprising a saturated oil signal quantity determining unit, an imbibition oil signal quantity determining unit and an imbibition efficiency measuring unit; The saturated oil signal quantity determining unit is used for drilling shale oil samples in the area to be measured, establishing a sample two-dimensional nuclear magnetic template and determining sample saturated oil signal quantity; The oil signal quantity determining unit after imbibition is also used for determining the oil signal quantity after imbibition of the sample according to the comprehensive imbibition efficiency curve and the saturated oil signal quantity of the sample; the efficiency measuring unit for imbibition is also used for calculating and obtaining the efficiency for shale oil imbibition of the area to be measured according to the saturated oil signal quantity of the sample and the oil signal quantity after imbibition of the sample.
20. The electronic equipment is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus; a memory storing a computer program; a processor for implementing a method of predicting shale oil imbibition efficiency as claimed in any one of claims 1 to 18 when executing a computer program stored on a memory.

Description

Method, device, equipment and storage medium for predicting shale oil imbibition efficiency Technical Field The present disclosure relates to the field of unconventional shale oil and gas reservoir exploration technologies, and in particular, to a method, apparatus, device, and storage medium for predicting shale oil imbibition efficiency. Background Shale oil, which refers to petroleum resources contained in shale-based shale formations, includes petroleum in shale pores and cracks, and also includes petroleum resources in tight carbonate or clastic adjacent layers and interlayers in shale formations. The shale oil reservoir develops a multi-scale pore throat structure, the micro-nano pore throat is widely developed, and compared with a conventional reservoir, the shale oil reservoir has higher capillary force and more obvious imbibition oil displacement effect. Imbibition oil extraction means that when the cracks around the matrix rock block are filled with water, the injected water in the cracks or large pore canals is sucked into the matrix rock block by capillary force and crude oil in the matrix is replaced, so that the redistribution of oil and water outside the matrix is realized. The imbibition exists in a plurality of key stages such as shale oil reservoir volume fracturing and water injection development, is one of important factors influencing shale oil productivity, and has important significance in improving shale oil recovery ratio by clearing imbibition characteristics and evaluating imbibition efficiency. In the prior art, the efficiency for evaluating shale oil seepage and absorption is mainly characterized by adopting a self-seepage and absorption oil discharge indoor test, and the method is divided into a mass method, a volume method and a nuclear magnetic resonance method. The mass method is to treat shale rock core, then put the shale rock core into a pre-prepared imbibition solution, the mass of the rock core changes in the imbibition process, and the change of the mass along with time is monitored by an electronic balance. The volumetric method was performed using a laboratory self-made water absorption instrument. And (3) putting the treated rock core into a pre-prepared imbibition solution, and recording the change of the volume of the discharged oil along with time. The nuclear magnetic resonance method is to distinguish the fluid movement conditions in different aperture spaces according to the T 2 spectrogram of nuclear magnetic resonance diagnosis in the process of the percolation experiment. Mass and volume metering is relatively cumbersome and subject to large errors. The nuclear magnetic method has precise measurement, but the oil-water signal can not be distinguished by simple one-dimensional nuclear magnetic method, and the water signal is eliminated by adding heavy water or soaking strong water. In addition, the methods can obtain the efficiency for imbibition only by carrying out imbibition experiments for a long time (more than 1 month), and the core after carrying out the chemical agent imbibition experiments is polluted and damaged to a certain extent, so that other experiments cannot be carried out. In view of the foregoing, a new method for rapidly predicting shale oil imbibition efficiency is needed. Disclosure of Invention In view of the above problems, the present disclosure provides a method, an apparatus, a device, and a storage medium for predicting efficiency for shale oil imbibition, which are used for solving the problems of overlong experimental period and pollution damage to a core in the existing efficiency evaluation method for shale oil imbibition. In a first aspect, a method of predicting efficiency for shale oil imbibition, the method comprising: Drilling a shale oil sample in a region to be measured, establishing a sample two-dimensional nuclear magnetic template, and determining a sample saturated oil signal quantity; Determining the oil signal quantity after the sample imbibition according to the comprehensive imbibition efficiency curve and the sample saturated oil signal quantity; And calculating to obtain the shale oil imbibition efficiency of the area to be measured according to the saturated oil signal quantity of the sample and the oil signal quantity after imbibition of the sample. Further, the comprehensive imbibition efficiency curve is obtained by the following method: The comprehensive imbibition efficiency curve is obtained by the following method: Preparing a plurality of rock samples with different physical characteristics; Respectively measuring two-dimensional nuclear magnetism of a plurality of rock samples to establish a two-dimensional nuclear magnetism template of the rock samples, and dividing a plurality of seepage areas; Determining a saturated oil signal quantity and a imbibition oil signal quantity based on a rock sample two-dimensional nuclear magnetic template; and respectively establishing comprehensive imbibition effic