CN114813811B - Light hydrocarbon content recovery method and device - Google Patents
Light hydrocarbon content recovery method and device Download PDFInfo
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Abstract
The invention provides a light hydrocarbon content recovery method which comprises the steps of taking a part of samples to be detected to measure original free hydrocarbon content to obtain original free hydrocarbon content of the samples to be detected, measuring the porosity and the free hydrocarbon content after quick loss of the rest samples to be detected to obtain porosity parameters of the samples to be detected and the free hydrocarbon content after quick loss, and fitting based on the original free hydrocarbon content, the free hydrocarbon content after quick loss and the porosity parameters to obtain a recovery relation. According to the invention, through researching the light hydrocarbon scattering process after a typical fresh core sample is placed, the relation between the scattered free hydrocarbon content and the physical property (porosity) and the original free hydrocarbon content of the sample is established, and according to the free hydrocarbon recovery correction relation of the typical sample, the recovery correction of the free hydrocarbon content of other core samples at the same region and the same horizon can be realized.
Description
Technical Field
The invention relates to the technical field of oil and gas exploration and development, in particular to a light hydrocarbon content recovery method and device.
Background
Free hydrocarbon is used as the most realistic movable oil component in shale retention oil, is usually characterized by pyrolysis S1 (hydrocarbon content released by heating unit rock to 300 ℃), is mainly liquid light hydrocarbon, and is unstable and easy to volatilize and lose. The content of the organic matter increases with the increase of the thermal maturity of the shale layer, and changes with the different types of organic matters. The free hydrocarbon components retained in the shale can cause different degrees of loss when being placed at the room temperature through coring, especially during the normal-temperature sample crushing process, and the higher the maturity of the shale is, the larger the hydrocarbon loss amount is.
The prior art is as follows:
1) Zhu Rifang, comparing the analysis test data of fresh samples after being processed under the freezing airtight condition and sample injection analysis and being placed for 30 days under the conventional condition, and considering that the evolution degree is in the mature evolution stage, the S1 light hydrocarbon loss rate is about 50% on average. In addition, the C14-component content is obtained by carrying out chromatographic analysis on crude oil produced by a natural section, so that a light hydrocarbon recovery method of a conventional sample chloroform asphalt A is established, and the light hydrocarbon loss amount at the Ro of 0.9% is considered to be about 30%. However, for samples of different oil contents and permeabilities, it does not indicate differences in light hydrocarbon loss rates and recovery methods;
2) Patent CN105223340 discloses a method for correcting chloroform asphalt A by using group component data, which is similar to Zhu Rifang literature in concept, but has a color layer effect in the migration process of crude oil, and the light hydrocarbon content in the crude oil cannot completely represent the original light hydrocarbon content in rock;
3) Wang Juan on the basis of the establishment of the former method, the light hydrocarbon content of rock samples in different mature stages is obtained by utilizing a low-boiling point solvent to perform light hydrocarbon closed low-temperature extraction, the light hydrocarbon recovery coefficient in the east-camping concave chloroform extraction process is established, and is considered to be consistent with the light hydrocarbon recovery coefficient obtained by a natural evolution profile method, but the light hydrocarbon loss method in the sample placement process cannot be recovered and calculated;
4) Patent CN103543470 discloses a light hydrocarbon correction method for simulating and calculating the ratio of light hydrocarbons (C6-13) to heavy hydrocarbons (c13+) of organic matters in different evolution stages by using a hydrocarbon generation dynamics method, and establishes a heavy hydrocarbon recovery method for the sunk residual hydrocarbons of the citizens on the basis of recovering the S1 heavy hydrocarbons, but the method is only suitable for a closed system without oil-gas migration, and has poor applicability for a common open shale oil system with oil-gas micro-migration;
5) Patent CN109633778 discloses a method for establishing a light hydrocarbon recovery coefficient by comparing a sample placed at normal temperature under the condition of liquid nitrogen freezing, but the method only recovers the light hydrocarbon loss in the sample crushing process, but does not consider the influence of the time length of the core placement;
6) JARVIE compares the S1 values of the sample after long-term placement with the fresh side-wall core sample, and considers that the difference of the free hydrocarbon content of the sample after long-term placement can reach about 5 times. And Chen et al calculate the light hydrocarbon loss ratio of different evolution stages of the type I kerogen by using a hydrogen index material balance method, consider that after entering an oil production window, the light hydrocarbon loss amount decreases with the increase of the evolution degree before Ro reaches 1.3%, and after Ro reaches 1.3%, the light hydrocarbon loss amount increases rapidly with the increase of the evolution degree, both of which do not relate to a specific recovery correction method;
Experimental research shows that the loss of light free hydrocarbon is a continuous process, the free hydrocarbon content S1 measured in a laboratory is greatly different along with the time of placing a core sample, the light hydrocarbon loss amount established based on an actual measurement value after placing the sample and the recovery result without considering the time of placing the sample cannot truly represent the original oil content information of the sample, the light hydrocarbon recovery correction needs to be based on a fresh sample, but the large-scale exploratory well deployment is difficult in the current low-oil-price environment, so that the light hydrocarbon recovery correction method developed based on a part of fresh sample is an effective method.
Accordingly, the present invention provides a light hydrocarbon content recovery method and apparatus.
Disclosure of Invention
To solve the above problems, the present invention provides a light hydrocarbon content recovery method comprising the steps of:
Taking a part of the sample to be measured to measure the original free hydrocarbon content, so as to obtain the original free hydrocarbon content of the sample to be measured;
measuring the porosity and the content of free hydrocarbon after quick loss of the residual sample to be measured, and obtaining the porosity parameter and the content of free hydrocarbon after quick loss of the sample to be measured;
and obtaining a restoration relation based on the original free hydrocarbon content, the free hydrocarbon content after the rapid loss and the porosity parameter fitting.
According to one embodiment of the invention, the method further comprises:
selecting core samples with different lithology combinations and different oil abundance as the samples to be measured aiming at a new drilling core;
and (3) carrying out liquid nitrogen freezing preservation on the sample to be tested, and then sending the sample to be tested to a laboratory.
According to one embodiment of the invention, the method further comprises:
and under the state of liquid nitrogen freezing, taking a part of samples to be detected, performing closed crushing, and performing rock pyrolysis analysis on the crushed samples to obtain the original free hydrocarbon content of the samples to be detected.
According to one embodiment of the invention, the method further comprises:
After the residual sample to be measured is recovered to normal temperature, the residual sample to be measured is divided into two parts, wherein the first part of the residual sample to be measured is used for measuring the porosity, and the second part of the residual sample to be measured is used for measuring the free hydrocarbon content after quick loss.
According to one embodiment of the invention, the method further comprises:
And under the room temperature condition, carrying out helium porosity measurement on the first part of the residual sample to be measured to obtain the porosity parameter of the sample to be measured.
According to one embodiment of the invention, the method further comprises:
and taking a part of samples from the second part of samples to be measured at preset intervals, performing closed sample crushing under a liquid nitrogen freezing state, performing pyrolysis analysis on the crushed samples to obtain the current free hydrocarbon content, and recording the free hydrocarbon content after the last pyrolysis as the free hydrocarbon content after the rapid dissipation when the difference between the free hydrocarbon contents after the two adjacent pyrolysis is not greater than a preset threshold value.
According to one embodiment of the invention, the method further comprises:
drawing a scatter diagram by taking the porosity parameter divided by the free hydrocarbon content after the rapid loss as a horizontal axis and taking the original free hydrocarbon content divided by the free hydrocarbon content after the rapid loss as a vertical axis;
And performing curve fitting based on the scatter diagram to obtain the recovery relation.
According to one embodiment of the invention, the recovery relation is expressed by the following formula:
Wherein S1 o represents the original free hydrocarbon content, S1 T represents the free hydrocarbon content after the rapid loss, a and b represent coefficients, and Φ represents the porosity parameter.
According to one embodiment of the invention, the method further comprises:
Obtaining free hydrocarbon content and porosity parameters of a core sample at the same horizon as the region where the sample to be measured is located after rapid loss;
And combining the recovery relation, and calculating to obtain the original free hydrocarbon content of the core sample at the same horizon as the region where the sample to be measured is located.
According to another aspect of the present invention, there is also provided a light hydrocarbon content recovery apparatus for recovering the content of original free hydrocarbons by the light hydrocarbon content recovery method as set forth in any one of the above, the apparatus comprising:
the original free hydrocarbon content module is used for taking a part of the sample to be detected to measure the original free hydrocarbon content, so as to obtain the original free hydrocarbon content of the sample to be detected;
The rapid free hydrocarbon content dissipation module is used for measuring the porosity of the residual sample to be tested and the free hydrocarbon content after rapid free hydrocarbon dissipation to obtain the porosity parameter of the sample to be tested and the free hydrocarbon content after rapid free hydrocarbon dissipation;
And a restoration relation module, which is used for obtaining a restoration relation based on the original free hydrocarbon content, the free hydrocarbon content after rapid loss and the porosity parameter fitting.
According to the light hydrocarbon content recovery method and device provided by the invention, through researching the light hydrocarbon loss process after a typical fresh core sample is placed, the relation between the free hydrocarbon content after loss and the physical property (porosity) and the original free hydrocarbon content of the sample is established, and according to the free hydrocarbon recovery correction relation of the typical sample, the recovery correction of the free hydrocarbon content of other core samples at the same region and the same horizon can be realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention, without limitation to the invention. In the drawings:
FIG. 1 shows a flow chart of a light hydrocarbon content recovery method according to one embodiment of the invention;
FIG. 2 shows a key parameter fit graph of a Qianjiang pit a well in three typical core segments, according to one embodiment of the invention;
FIG. 3 shows a plot of raw free hydrocarbon content recovery value versus current free hydrocarbon content value for a section of a B-well three-section core in a Qianjiang pit according to one embodiment of the invention;
FIG. 4 is a graph showing the comparison of the recovery of the original free hydrocarbon content of a B-well three-section core of a Qianjiang pit by various methods according to one embodiment of the invention, and
Fig. 5 shows a block diagram of a light hydrocarbon content recovery apparatus according to one embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 shows a flow chart of a light hydrocarbon content recovery method according to one embodiment of the invention.
Referring to fig. 1, in step S101, a portion of a sample to be measured is taken for measuring the original free hydrocarbon content, so as to obtain the original free hydrocarbon content of the sample to be measured.
Specifically, under the state of liquid nitrogen freezing, taking a part of samples to be detected, performing closed crushing, and performing rock pyrolysis analysis on the crushed samples to obtain the original free hydrocarbon content of the samples to be detected.
In one embodiment, 5-10 g of sample to be measured is selected, the sample is subjected to closed crushing under the liquid nitrogen freezing state, and rock pyrolysis analysis is performed on the crushed sample in time, so that the original free hydrocarbon content of the sample is obtained.
In one embodiment, the sample to be tested may be obtained by first selecting core samples of different lithology combinations and different oil abundance as the sample to be tested for the new drill core. Then, the sample to be tested is sent to a laboratory for testing after being frozen and preserved by liquid nitrogen.
Referring to fig. 1, in step S102, the porosity and the content of free hydrocarbons after rapid dissipation are measured for the remaining sample to be measured, so as to obtain the porosity parameter and the content of free hydrocarbons after rapid dissipation of the sample to be measured.
Specifically, after the residual sample to be measured is recovered to normal temperature, the residual sample to be measured is divided into two parts, wherein the first part of the residual sample to be measured is used for measuring the porosity, and the second part of the residual sample to be measured is used for measuring the free hydrocarbon content after quick loss.
Further, under the condition of room temperature, carrying out helium porosity measurement on the first part of the residual sample to be measured to obtain the porosity parameter of the sample to be measured.
Further, taking a part of samples from the second part of samples to be measured at preset time intervals, performing closed breaking under the liquid nitrogen freezing state, performing pyrolysis analysis on the broken samples to obtain the current free hydrocarbon content, and recording the free hydrocarbon content after the last pyrolysis as the free hydrocarbon content after the rapid dissipation when the difference between the free hydrocarbon contents after the two adjacent pyrolysis is not more than a preset threshold value.
In one embodiment, at intervals of 1 month, a part of samples are taken from the second part of samples to be measured which are placed at normal temperature, frozen, sealed and crushed, pyrolyzed, the current free hydrocarbon content is obtained, the comparison between the current free hydrocarbon content and the free hydrocarbon content obtained in the last pyrolysis is carried out, the two test results differ by not more than 10%, the end of the rapid loss process is judged, and the free hydrocarbon content obtained in the last pyrolysis, namely the S1 T value, is recorded.
As shown in fig. 1, in step S103, a recovery relation is obtained based on the original free hydrocarbon content, the free hydrocarbon content after rapid loss, and the porosity parameter fitting.
Specifically, step S103 includes the steps of:
S1031, a scatter diagram is drawn by taking the porosity parameter divided by the free hydrocarbon content after the rapid loss as a horizontal axis and taking the original free hydrocarbon content divided by the free hydrocarbon content after the rapid loss as a vertical axis.
S1032, curve fitting is carried out based on the scatter diagram, and a recovery relation is obtained.
Specifically, the recovery relation is expressed by the following formula:
Wherein, S1 o represents the original free hydrocarbon content, S1 T represents the free hydrocarbon content after quick loss, a and b represent coefficients, and Φ represents a porosity parameter.
Specifically, in the fitting process, the values of the coefficients a and b are determined, and a recovery relation is obtained.
In one embodiment, the method further comprises:
S104, obtaining free hydrocarbon content and porosity parameters of the core sample at the same horizon as the region where the sample to be measured is located after rapid loss.
S105, combining the recovery relation, and calculating to obtain the original free hydrocarbon content of the core sample at the same horizon as the region where the sample to be measured is located.
To sum up, in order to overcome the defects of the prior method, the invention establishes the relation between the content of the scattered free hydrocarbon and the physical properties (porosity) and the original content of the free hydrocarbon of the sample through researching the light hydrocarbon scattering process after a typical fresh core sample is placed. And according to the free hydrocarbon recovery correction relation of the typical sample, the recovery correction of the free hydrocarbon content of other core samples at the same region and the same horizon can be realized.
In one embodiment, jiang Han basin Qianjiang is selected to be recessed into a three-section a-well 10-meter core for example, and lithology such as a layer/lamellar argillaceous dolomite, dolomite mudstone, argillite limestone and glauberite is mainly developed.
According to on-site core observation, 10 typical samples are selected as modeling data sources, closed freezing sample crushing and porosity testing experiments are carried out, the original free hydrocarbon content S1 o, the S1 T value after quick loss and the corresponding porosity phi value are obtained, the results are shown in table 1, and the fitting results are shown in fig. 2.
Table 1 Qianjiang values of key parameters of a typical core of a well of a certain A-well of a certain type
As can be seen from the fitting result of FIG. 2, the value a is 1.2514, the value b is 0.2157, the values are put into a recovery relation after finishing, and the following recovery relation is established:
S1o＝S1T×1.2514×e^(0.2157*(Ф/S1T))
And then, carrying out recovery calculation on other well cores at the same layer of the zone, carrying out original free hydrocarbon recovery correction on 38 core samples of a certain B well sinking three section of the Jiang Han basin Qianjiang by using the above formula, wherein the 35 samples are the samples which are placed for a long time under the condition that no measures are taken in a core warehouse, and the recovery result is shown in Table 2.
Table 2 Qianjiang recovery of free hydrocarbon S1 from a three-section core of a well B
Comparison of the recovered values with the current measured S1 T values (FIG. 3) shows that the recovered free hydrocarbon content (original free hydrocarbon content S1 o) is generally different from the light hydrocarbon loss under different physical conditions, but generally has correlation, which also shows that the maturity controls the fluidity of hydrocarbon fluids and the loss of hydrocarbons, and the maturity controls the proportion of light hydrocarbons, namely the basis of the volatilization loss of light hydrocarbons.
Compared with the recovery results (figure 4) of the B well sample by two methods which are more applied in the industry at present, the method has comparability with the two methods in the prior art, but the results are inconsistent and affected by the pore-permeation condition of the rock sample, and the calculated result of the method shows the heterogeneity of the sample and is more reasonable and objective.
Fig. 5 shows a block diagram of a light hydrocarbon content recovery apparatus according to one embodiment of the invention. The light hydrocarbon content recovery apparatus 500 comprises an original free hydrocarbon content module 501, a fast-loss free hydrocarbon content module 502, and a recovery relationship module 503.
The raw free hydrocarbon content module 501 is configured to take a portion of the sample to be measured to determine the raw free hydrocarbon content of the sample to be measured.
The fast free hydrocarbon content dissipating module 502 is configured to perform porosity measurement and fast free hydrocarbon content measurement on the remaining sample to be measured, and obtain a porosity parameter of the sample to be measured and the fast free hydrocarbon content.
The recovery relation module 503 is configured to obtain a recovery relation based on the original free hydrocarbon content, the free hydrocarbon content after rapid loss, and the porosity parameter fitting.
In summary, the light hydrocarbon content recovery method and device provided by the invention establish the relation between the free hydrocarbon content after the light hydrocarbon is scattered and the physical property (porosity) of the sample and the original free hydrocarbon content through researching the light hydrocarbon scattering process after a typical fresh core sample is placed, and can realize recovery correction of the free hydrocarbon content of other core samples at the same region and the same horizon according to the free hydrocarbon recovery correction relation of the typical sample.
It is to be understood that the disclosed embodiments are not limited to the specific structures, process steps, or materials disclosed herein, but are intended to extend to equivalents of these features as would be understood by one of ordinary skill in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention are disclosed above, the embodiments are only used for the convenience of understanding the present invention, and are not intended to limit the present invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.
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| CN119619207B (en) * | 2023-09-13 | 2025-12-12 | 中国石油天然气集团有限公司 | Evaluation method for light hydrocarbon component content in low-permeability reservoirs |
| CN120214004A (en) * | 2023-12-26 | 2025-06-27 | 中国石油天然气股份有限公司 | Method, equipment and storage medium for evaluating movable oil content in shale |
| CN118671219B (en) * | 2024-06-14 | 2025-12-02 | 中国石油大学(北京) | A method for recovering hydrocarbons in tight rock cores |
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| CN106153490B (en) * | 2015-04-21 | 2019-03-08 | 中国石油化工股份有限公司 | Utilize the method for being detained hydrocarbon content in chloroform bitumen A evaluation shale |
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