CN114414609A - Experiment method for calculating influence of invasion liquid on shale oil momentum based on nuclear magnetic T2 spectrum - Google Patents
Experiment method for calculating influence of invasion liquid on shale oil momentum based on nuclear magnetic T2 spectrum Download PDFInfo
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Abstract
The invention discloses an experimental method for calculating the influence of invasion liquid on shale oil momentum based on a nuclear magnetic T2 spectrum, which comprises the following steps of S1, cutting a shale sample into two cores; performing a saturated oil experiment on the dried rock core, testing a nuclear magnetic T2 spectrum and calculating a spectrum area As(ii) a S2, preparing a slurry solution, adding manganese chloride, performing a wet filtration experiment on the core SHALE-1 by using the slurry solution, testing a nuclear magnetic T2 spectrum, and calculating a spectrum area AOil LAnd SOil L(ii) a S3, reducing the matrix pore saturation for multiple times by adopting a throughput mode for the two rock cores respectively, and testing nuclear magnetic T2 spectrum to calculate the spectrum area A after reducing the matrix pore saturation for each timeCiSaturation S of the remaining oil in the poresOil iAnd oil recovery RFOil i(ii) a S4, calculating the difference of the oil recovery rates of the two cores, wherein the difference is the influence value of the invasion liquid on the momentum; the method and the device can improve the accuracy of evaluation of the crude oil momentum in the shale stratum.
Description
Technical Field
The invention relates to the technical field of exploration and development, in particular to an experimental method for calculating the influence of invasion liquid on shale oil momentum based on a nuclear magnetic T2 spectrum.
Background
Shale oil available reserve (simply called "momentum") evaluation technology usually only calculates the influence of the lost oil quantity caused by the influence of temperature or pressure on the total momentum, and the influence of external invasion fluid on the momentum is ignored in the prior art. During the drilling of oil fields, the mud filtrate under pressure invades the matrix pores of the rock and forms invaded zones with a certain depth. Evaluation of shale formation momentum requires corresponding laboratory analysis on a drilled core sample, and due to invasion, part of the oil in the pores of the core sample is replaced by the invaded fluid. The presence of the invasion fluid may affect the accuracy of formation mobility evaluation.
CO2Is a common oil displacement medium in site, CO2The throughput technology is a common oil displacement technology, and the amount of drivable oil under the action of the technology is the key point of shale oil mobility research. CO22After the core is injected, the oil in the pores and the external invasion liquid can interact with each other, and the invasion liquid can block CO2The contact with oil in partial pores further reduces the recovery ratio obtained in a laboratory, and when the mobility of the formation crude oil is evaluated by using recovery ratio data in the laboratory, the mobility of the formation crude oil is underestimated by an experimental result, so that the resource loss is caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an experimental method for calculating the influence of an invaded liquid on the shale oil momentum based on a nuclear magnetic T2 spectrum, and the method can improve the accuracy of evaluation of the shale oil momentum.
The technical scheme adopted by the invention is as follows:
an experimental method for calculating the influence of invasion liquid on the momentum of shale oil based on nuclear magnetic T2 spectrum comprises the following steps,
s1, core pretreatment: cutting a shale sample into two cores, and respectively recording the coresSHALE-1 and core SHALE-2; drying the rock core, and performing a saturated oil experiment on the dried rock core; testing nuclear magnetism T2 spectrum of the rock core under the saturated oil state and calculating the spectral area AsAt this time, the pore oil saturation SOil s＝100％；
S2 slurry wetting test of core SHALE-1: preparing a slurry solution, adding manganese chloride, and performing a wet filtration experiment on the rock core SHALE-1 by using the slurry solution to simulate an invasion state; testing nuclear magnetic T2 spectrum of core SHALE-1 after wet filtration experiment and calculating spectral area AOil LCalculating the saturation S of the residual oil in the core SHALE-1Oil L,SOil L＝AOil L/As*100％；
CO of S3, core SHALE-1 and core SHALE-22Throughput experiment: reducing the porosity saturation of the matrix for multiple times by adopting a throughput mode for the two rock cores respectively, and testing a nuclear magnetic T2 spectrum to calculate the spectrum area A after reducing the porosity saturation of the matrix for each timeCiCalculating the saturation S of the residual oil in the pore space of the core in each huff and puff experiment processOil iAnd oil recovery RFOil i(ii) a Wherein S isOil i＝ACi/As*100％；RFOil i＝100-SOil i；
And S4, calculating the difference of the oil recovery rates of the two cores, wherein the difference is the influence value of the invasion liquid on the momentum.
Further, calculating the difference of the oil recovery rates of the two cores specifically comprises:
drawing two cores in CO2Oil phase recovery RF during huff and puffOil iPlate, two cores obtained in CO2And calculating the difference of the oil recovery rates of the two cores according to the change curve of the oil phase recovery rate in the handling process.
Further, the concentration of the manganese chloride is 20 g/L.
Further, the method for reducing the porosity saturation of the matrix for multiple times by respectively handling two cores specifically comprises the following three stages:
s31, swallowing: opening a gas inlet end valve of the core holder and closing a gas outlet end valve of the core holder, and injecting a determined amount of carbon dioxide into the core;
s32, braising: closing a gas inlet end valve of the core holder, sealing carbon dioxide in the core, enabling gas to diffuse into the pores of the core, and maintaining for about 12-24 hours;
s33, spit: opening the gas valve at the front end of the core to release CO2，CO2The molecules will carry water and oil out of the core pores.
Further, performing a saturated oil experiment on the dried rock core, specifically, putting the rock core into a sample chamber of a saturation tank, and injecting oil into a liquid chamber of the saturation tank; then simultaneously vacuumizing the sample chamber and the liquid chamber to remove air in the sample chamber and the liquid chamber; and then, injecting oil in the fluid chamber into the sample chamber to immerse the core, pressurizing to 32MPa, and keeping for 24 hours to saturate the sample with oil.
Further, performing a wet filtration experiment on the core SHALE-1 by using the slurry solution to simulate an invasion state, specifically, loading a saturated oil core into a holder of slurry circulation equipment, and applying confining pressure to wrap the core to perform the wet filtration experiment; the tail end of the core holder is closed, the front end of the core holder is connected with a slurry circulating pipeline, and slurry solution flows through the front end face of the core from top to bottom; in the process that the front end slurry solution scours the end face of the rock core, part of slurry filtrate can diffuse and invade into the pores of the rock core and replace oil in the pores, and particles in the slurry can be accumulated at the front end of the rock core to form a mud cake; the wet filtration test was terminated after 24 hours of flushing, and a state in which an invading fluid was present was established.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
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In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 shows two cores in CO2Oil recovery RF during huff and puffOil iAnd (7) making a plate.
Detailed Description
Embodiments of the present invention will be described in detail with reference to specific embodiments. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
The application relates to an experimental method for evaluating the influence of invasion liquid on shale oil momentum, which comprises the following steps,
s1, core pretreatment:
s11, cutting a SHALE sample into two sections to obtain two cores, and respectively recording the two cores as a core SHALE-1 and a core SHALE-2; core SHALE-1 for developing CO containing invasion fluid2Huff and puff experiment, core SHALE-2 used for CO without invasion liquid2And (4) carrying out throughput experiments.
S12, drying the core (including core SHALE-1 and core SHALE-2, the same below); specifically, the rock core is placed in an oven to be dried, wherein the drying temperature is 200 ℃, and the drying time is 24 hours.
And S13, performing a saturated oil experiment on the dried core. Firstly, putting a rock core into a sample chamber of a saturation tank, and injecting oil into a liquid chamber of the saturation tank; then simultaneously vacuumizing the sample chamber and the liquid chamber to remove air in the sample chamber and the liquid chamber; and then, injecting oil in the fluid chamber into the sample chamber to immerse the core, pressurizing to 32MPa, and keeping for 24 hours to saturate the sample with oil.
Testing nuclear magnetism T2 spectrum of the rock core under the saturated oil state and calculating the spectral area AsAt this time, the pore oil saturation SOil s＝100％，AsReflecting the state of fully saturated oil in the pores.
S2 slurry wetting test of core SHALE-1:
s21, preparing a slurry solution and adding manganese chloride.
The material for preparing the slurry solution is a commercial product, and the slurry solution is obtained after water is added according to the specification. Manganese chloride with the concentration of 20g/L is added into the prepared slurry solution so as to shield nuclear magnetic signals of water in the slurry solution.
S22, performing a wet filtration experiment on the core SHALE-1 by using the slurry solution prepared in the step S21 to simulate an invasion state.
Specifically, a saturated oil core is loaded into a holder of slurry circulation equipment, and confining pressure is applied to wrap the core to carry out a moisture filtration experiment; the tail end of the core holder is closed, the front end of the core holder is connected with a slurry circulating pipeline, and slurry solution flows through the front end face of the core from top to bottom; in the process that the front end slurry solution scours the end face of the rock core, part of slurry filtrate can diffuse and invade into the pores of the rock core and replace oil in the pores, and particles in the slurry can be accumulated at the front end of the rock core to form a mud cake; the wet filtration test was completed after 24 hours of flushing, at which time some of the oil in the core was replaced by the invaded mud filtrate, and the oil saturation was less than 100%, thus creating a state in which invaded fluid was present.
S23, testing nuclear magnetic T2 spectrum of rock core SHALE-1 after wet filtration experiment and calculating spectral area AOil LAnd according to the spectral area AOil LCalculating the saturation S of the residual oil in the core SHALE-1Oil L。
Taking out a sample after the wet filtration experiment is finished, washing away mud cakes by using a manganese chloride solution with the concentration of 20g/L, and wiping fluid on the surface of the core SHALE-1 by using filter paper; nuclear magnetic T2 spectral calculation spectral area A of test core SHALE-1Oil L；
At the moment, the nuclear magnetic spectrum area reflects the saturation S of the residual oil in the core SHALE-1Oil L，SOil L＝AOil L/As*100％。
CO of S3, core SHALE-1 and core SHALE-22Throughput experiment: respectively loading two cores into a core holder, respectively reducing the matrix pore saturation for multiple times in a huff and puff mode for the two cores, and testing a nuclear magnetic T2 spectrum to calculate the spectrum area after reducing the matrix pore saturation for each timeACiCalculating the saturation S of the residual oil in the pore space of the core in each huff and puff experiment processOil iAnd oil recovery RFOil i。
Reducing the porosity saturation of the matrix for multiple times by adopting a huff and puff mode for the two cores respectively, and specifically comprises the following three stages:
s31, swallowing: and opening a gas inlet end valve of the core holder and closing a gas outlet end valve of the core holder, and injecting a determined amount of carbon dioxide into the core.
S32, braising: and closing a gas inlet end valve of the core holder, and sealing carbon dioxide in the core to ensure that gas is diffused into the pores of the core and is maintained for about 12-24 hours.
S33, spit: opening the gas valve at the front end of the core to release CO2，CO2The molecules will carry water and oil out of the core pores.
Repeating the steps for 3-6 times, and respectively measuring and calculating nuclear magnetic T2 spectrums of the two rock cores to calculate the spectrum area A after each timeCi。
Since the addition of manganese chloride to the slurry solution shields the nuclear magnetic signal of water, the reaction is carried out in CO2Spectral area A of nuclear magnetic T2 spectrum of core SHALE-1 in huff and puff experimentCiSpectral area A of nuclear magnetic T2 spectrum of core SHALE-2CiAll reflect the state of the remaining oil in its pores; spectral area A from nuclear magnetic T2 spectra of two coresCiRespectively calculating the saturation S of the residual oil of the two cores in each handling experiment processOil iAnd oil recovery RFOil i。
Wherein S isOil i＝ACi/As*100％；
RFOil i＝100-SOil i。
And S4, calculating the difference of the oil recovery rates of the two cores, wherein the difference is the influence value of the invasion liquid on the momentum.
Specifically, two cores were drawn at CO2Oil phase recovery RF during huff and puffOil iPlate, two cores obtained in CO2Oil phase recovery ratio variation curve during huff and puff, according to the variationThe difference in oil recovery from the two cores was calculated from the curves.
The plotted plate is shown in fig. 1.
In FIG. 1, the abscissa is the throughput run, where "CO" is2 Throughput round 0 "represents the initial state; for core SHALE-1, which represents the end of the core SHALE-1 wet out test, after the core SHALE-1 wet out test, a portion of the oil was replaced with the invasion fluid, thus, in "CO" condition2The recovery at the 0 "position of the huff and puff run is not the true recovery of the core SHALE-1, which represents the portion of oil lost after being replaced by water; while for core SHALE-2, it did not invade the fluid at "CO2There was no oil loss during the 0 "phase of the throughput run, so the recovery rate was 0. "CO2Throughput runs 1-4 "represent 4 runs of CO2 throughput processes, respectively. Oil recovery RF with core on ordinateOil iWhich corresponds to the cumulative amount of oil produced at each stage, is an increasing process.
As can be seen from FIG. 1, the oil recovery of core SHALE-1 is higher than that of core SHALE-2 because the core SHALE-1 contains invasion fluid, which displaces a portion of the oil; in CO2During the 1 st round and the 2 nd round of the huff-puff experiment, as the rock core SHALE-1 contains the invasion liquid, part of the invasion liquid can be produced while oil is produced, and the oil recovery rate is slowly increased; and also in CO2In the 1 st round and the 2 nd round of the huff and puff experiment, as the rock core SHALE-2 does not contain invasion liquid, the oil recovery rate is greatly improved; in CO2In the 3 rd round of the huff and puff experiment, the invaded liquid in the rock core SHALE-1 is basically and completely produced, and the recovery ratio of the oil of the invaded liquid appears in the synchronous change of the recovery ratio of the oil in the rock core SHALE-2; the recovery factor values of the two cores are basically stable by the 4 th round, and the oil recovery factor of the 4 th round represents the CO2Maximum movable volume that can be obtained by throughput experiments; and calculating the difference value of the recovery ratio of the 4 th round of the two rock cores to obtain the influence value of the invasion liquid on the momentum.
The method adopts an experimental mode to simulate the invasion process of the invasion liquid and respectively develop CO in parallel samples without the invasion liquid and parallel samples with the invasion liquid2The oil displacement experiment is taken out and treated, the influence value of the invasion liquid on the momentum can be quantitatively calculated, the influence rule of the invasion liquid on the momentum can be quantified, and the accuracy of evaluation of the momentum of crude oil in the shale stratum can be improved.
In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral combinations thereof; may be an electrical connection; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, systems, and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, system, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, systems, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (6)
1. An experimental method for calculating the influence of an invasion liquid on the momentum of shale oil based on a nuclear magnetic T2 spectrum is characterized by comprising the following steps,
s1, core pretreatment: cutting a SHALE sample into two cores, and respectively recording the cores as a core SHALE-1 and a core SHALE-2; drying the rock core, and performing a saturated oil experiment on the dried rock core; testing nuclear magnetism T2 spectrum of the rock core under the saturated oil state and calculating the spectral area AsAt this time, the pore oil saturation SOil s＝100％；
S2 slurry wetting test of core SHALE-1: preparing a slurry solution, adding manganese chloride, and performing a wet filtration experiment on the rock core SHALE-1 by using the slurry solution to simulate an invasion state; testing nuclear magnetic T2 spectrum of core SHALE-1 after wet filtration experiment and calculating spectral area AOil LCalculating the saturation S of the residual oil in the core SHALE-1Oil L,SOil L＝AOil L/As*100％；
CO of S3, core SHALE-1 and core SHALE-22Throughput experiment: reducing the porosity saturation of the matrix for multiple times by adopting a throughput mode for the two rock cores respectively, and testing a nuclear magnetic T2 spectrum to calculate the spectrum area A after reducing the porosity saturation of the matrix for each timeCiCalculating the saturation S of the residual oil in the pore space of the core in each huff and puff experiment processOil iAnd oil recovery RFOil i(ii) a Wherein S isOil i＝ACi/As*100％；RFOil i＝100-SOil i；
And S4, calculating the difference of the oil recovery rates of the two cores, wherein the difference is the influence value of the invasion liquid on the momentum.
2. The experimental method for calculating the influence of invasion liquid on shale oil momentum based on nuclear magnetic T2 spectrum according to claim 1, wherein the difference of oil recovery ratio of two cores is calculated by:
drawing two cores in CO2Oil phase recovery RF during huff and puffOil iPlate, two cores obtained in CO2And calculating the difference of the oil recovery rates of the two cores according to the change curve of the oil phase recovery rate in the handling process.
3. The experimental method for calculating the influence of an invaded fluid on the momentum of shale oil based on nuclear magnetic T2 spectrum according to claim 1, wherein the concentration of manganese chloride is 20 g/L.
4. The experimental method for calculating the influence of invasion liquid on shale oil momentum based on nuclear magnetic T2 spectrum according to claim 1, wherein the method for reducing the matrix pore saturation for multiple times by means of throughput for two cores respectively comprises the following three stages:
s31, swallowing: opening a gas inlet end valve of the core holder and closing a gas outlet end valve of the core holder, and injecting a determined amount of carbon dioxide into the core;
s32, braising: closing a gas inlet end valve of the core holder, sealing carbon dioxide in the core, enabling gas to diffuse into the pores of the core, and maintaining for about 12-24 hours;
s33, spit: opening the gas valve at the front end of the core to release CO2，CO2The molecules will carry water and oil out of the core pores.
5. The experiment method for calculating the influence of the invaded liquid on the shale oil momentum based on the nuclear magnetic T2 spectrum according to claim 1, wherein the dried rock core is used for a saturated oil experiment, specifically, the rock core is firstly placed in a sample chamber of a saturation tank, and oil is injected into a liquid chamber of the saturation tank; then simultaneously vacuumizing the sample chamber and the liquid chamber to remove air in the sample chamber and the liquid chamber; and then, injecting oil in the fluid chamber into the sample chamber to immerse the core, pressurizing to 32MPa, and keeping for 24 hours to saturate the sample with oil.
6. The experiment method for calculating the influence of the invasion liquid on the SHALE oil momentum based on the nuclear magnetic T2 spectrum according to claim 1, wherein the slurry solution is used for carrying out a moisture filtration experiment on a rock core SHALE-1 to simulate an invasion state, specifically, a saturated oil rock core is loaded into a holder of slurry circulation equipment, and confining pressure is applied to wrap the rock core to carry out the moisture filtration experiment; the tail end of the core holder is closed, the front end of the core holder is connected with a slurry circulating pipeline, and slurry solution flows through the front end face of the core from top to bottom; in the process that the front end slurry solution scours the end face of the rock core, part of slurry filtrate can diffuse and invade into the pores of the rock core and replace oil in the pores, and particles in the slurry can be accumulated at the front end of the rock core to form a mud cake; the wet filtration test was terminated after 24 hours of flushing, and a state in which an invading fluid was present was established.
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