Method and device for evaluating water-out degree of oil layer based on two-dimensional gas chromatography information

Abstract

The application provides an oil layer water flooding degree evaluation method and device based on two-dimensional gas chromatography information. O , D w and D three technical parameters can obtain the water flooding degree of the oil layer, reduces the technical parameters for evaluating the water flooding degree of the oil layer, the evaluation process is simple, the cost is low, the accuracy is high, and the defects of the traditional water flooding layer logging evaluation method, such as technical complexity, high cost and poor accuracy, are overcome.

Description

Technical Field

[0001] This invention belongs to the field of petroleum geological logging technology, and particularly relates to a method and apparatus for evaluating the degree of water flooding in oil reservoirs based on two-dimensional gas chromatography information. Background Technology

[0002] As old oilfields enter the later stages of oil and gas exploration and development, some wells enter a high water-cut state. To improve the efficiency of oil and gas development, it is necessary to evaluate the water-flooded layer condition. Traditional techniques mainly rely on well logging methods for evaluation. To address the need for water-flooded layer evaluation, the logging industry has developed water-flooded layer logging evaluation technologies based on methods such as nuclear magnetic resonance and pyrolysis chromatography. However, these technologies suffer from problems such as technical complexity, high cost, and poor accuracy. Summary of the Invention

[0003] The purpose of this invention is to provide a method for evaluating the degree of water flooding in oil reservoirs based on two-dimensional gas chromatography information. This method involves detecting the two-dimensional gas chromatography information of both the crude oil sample and the separated water sample obtained after oil-water separation from a water-bearing crude oil sample, calculating the water flooding index D, and evaluating the degree of water flooding in the oil reservoir to which the water-bearing crude oil sample belongs. This method is characterized by its simplicity, low cost, and high accuracy, overcoming the problems of technical complexity, high cost, and poor accuracy associated with existing water flooding layer logging evaluation techniques based on methods such as nuclear magnetic resonance and pyrolysis chromatography in the well logging industry.

[0004] One aspect of the present invention provides a method for evaluating the degree of water flooding in oil reservoirs based on two-dimensional gas chromatography information, comprising:

[0005] A water-containing crude oil sample was collected, and crude oil and water samples were obtained through oil-water separation.

[0006] Obtain the two-dimensional gas chromatographic information of the crude oil sample and the two-dimensional gas chromatographic information of the separated water sample, and calculate the oil reservoir water flooding index D;

[0007] Based on the two-dimensional gas chromatography information of the crude oil sample, the two-dimensional gas chromatography information of the separated water sample, and the oil layer water flooding index D, the degree of water flooding of the oil layer to which the water-bearing crude oil sample belongs is evaluated.

[0008] According to a specific embodiment of the present invention, the two-dimensional gas chromatographic information of the crude oil sample includes two-dimensional gas chromatographic information of n-alkanes, two-dimensional gas chromatographic information of cycloalkanes, and two-dimensional gas chromatographic information of monocyclic aromatic hydrocarbons; and / or

[0009] The two-dimensional gas chromatographic information of the separated water sample includes two-dimensional gas chromatographic information of n-alkanes, cycloalkanes, and monocyclic aromatic hydrocarbons of the separated water sample.

[0010] According to a specific embodiment of the present invention, the hydrocarbon value D of a crude oil sample is calculated.O ;

[0011] The hydrocarbon value D of the crude oil sample O The calculations were based on the two-dimensional gas chromatographic information of n-alkanes, cycloalkanes, and monocyclic aromatics from the crude oil sample.

[0012] According to a specific embodiment of the present invention, the hydrocarbon value D of the separated water sample is calculated. W ;

[0013] The hydrocarbon value D of the separated water sample W The results were calculated based on the two-dimensional gas chromatographic information of n-alkanes, cycloalkanes, and monocyclic aromatics of the separated water sample.

[0014] According to a specific embodiment of the present invention, the reservoir water flooding index D is based on the hydrocarbon value D of the crude oil sample. O And the hydrocarbon value D of the separated water sample W Calculated.

[0015] According to a specific embodiment of the present invention, combined with the hydrocarbon value D of the crude oil sample O Hydrocarbon value D of separated water sample W The water flooding index D is used to evaluate the degree of water flooding in the oil layer to which the water-bearing crude oil sample belongs.

[0016] According to a specific embodiment of the present invention, the sample to be tested and the extract are extracted and processed to obtain the extracted sample;

[0017] The extracted sample is subjected to primary component separation to separate at least three categories of components, namely, n-alkane components, cycloalkane components, and monocyclic aromatic components.

[0018] At least the three types of components are modulated respectively to obtain at least the three types of components modulated;

[0019] At least the three types of modulated components are subjected to secondary component separation to obtain at least various n-alkane components, various cycloalkane components, and various monocyclic aromatic components, distinguished by the number of carbon atoms.

[0020] At least the various n-alkane components, cycloalkane components, and monocyclic aromatic components classified by carbon number are subjected to information quantification processing to obtain the two-dimensional gas chromatographic information of the sample to be tested, including the two-dimensional gas chromatographic information of the n-alkane, cycloalkane, and monocyclic aromatic components of the sample to be tested; the sample to be tested is the crude oil sample or the separated water sample.

[0021] The second invention provides an oil reservoir water flooding assessment device based on two-dimensional gas chromatography information. The device is used to implement the method provided in the first invention, comprising:

[0022] A two-dimensional gas chromatography information detection module is used to detect the two-dimensional gas chromatography information of the crude oil sample and the two-dimensional gas chromatography information of the separated water sample;

[0023] The data processing module is used to acquire the two-dimensional gas chromatography information of the crude oil sample and the two-dimensional gas chromatography information of the separated water sample, perform data processing, and evaluate the water flooding degree of the oil layer to which the water-bearing crude oil sample belongs.

[0024] The third invention provides the application of the oil reservoir water flooding degree evaluation method based on two-dimensional gas chromatography information provided in the first invention, or the oil reservoir water flooding degree evaluation device based on two-dimensional gas chromatography information provided in the second invention, in petroleum geological logging.

[0025] The fourth invention provides a hardware storage device having computer execution instructions stored thereon, which, when executed by a processor, implement the steps of the oil reservoir water flooding degree evaluation method based on two-dimensional gas chromatography information provided in the first invention.

[0026] The beneficial effects of this invention are:

[0027] Compared with the prior art, the present invention may have the following advantages:

[0028] 1. It has achieved automation of sample pretreatment, sample injection, and two-dimensional gas chromatography information detection for crude oil samples and separated water samples. It can automatically perform two-dimensional gas chromatography information detection on crude oil samples and separated water samples obtained from oil-water separation of sampled water-containing crude oil samples in a timely manner.

[0029] 2. A creative method for obtaining and calculating the hydrocarbon values ​​D of crude oil samples was proposed. O Hydrocarbon value D of separated water sample w The method for evaluating the water flooding degree of the reservoir to which a water-bearing crude oil sample belongs, based on the reservoir water flooding index D, only requires determining D. O D w The water flooding degree of the oil layer can be obtained from these three technical parameters, which reduces the number of technical parameters required to evaluate the water flooding degree of the oil layer. The evaluation process is simple, low-cost, and highly accurate, overcoming the shortcomings of existing water flooding layer logging evaluation methods based on nuclear magnetic resonance, pyrolysis chromatography, etc. in the logging industry, which are technically complex, costly, and inaccurate. Attached Figure Description

[0030] Figure 1This is a schematic diagram of the steps in the method for evaluating the degree of water flooding in an oil reservoir based on two-dimensional gas chromatography information provided in an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the structure of the oil layer water flooding evaluation device based on two-dimensional gas chromatography information provided in an embodiment of the present invention, wherein 1-sample pretreatment module, 2-automatic injection module, 3-one-dimensional gas chromatography column, 4-modulation module, 5-modulation column, 6-two-dimensional gas chromatography column, 7-control module, 8-display module, 9-information output module, and 10-chassis.

[0032] The above figures are not drawn to actual size and scale. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] For ease of description, some nouns or terms appearing in the embodiments of the present invention will be described in detail below.

[0036] n-Alkanes: Straight-chain alkanes in which carbon atoms are arranged in a straight line in their molecular structure.

[0037] Cycloalkanes: Saturated hydrocarbons whose molecular structure contains alicyclic structures.

[0038] Monocyclic aromatic hydrocarbons: Aromatic hydrocarbons whose molecular structure contains a benzene ring.

[0039] Two-dimensional gas chromatography: Full two-dimensional gas chromatography.

[0040] The two-dimensional gas chromatographic information of n-alkanes referred to in this invention refers to the content of various n-alkanes in crude oil samples (or separated water samples) distinguished by the number of carbon atoms. The two-dimensional gas chromatographic information of cycloalkanes referred to in this invention refers to the content of various cycloalkanes in crude oil samples (or separated water samples) distinguished by the number of carbon atoms. The two-dimensional gas chromatographic information of monocyclic aromatic hydrocarbons referred to in this invention refers to the content of various monocyclic aromatic hydrocarbons in crude oil samples (or separated water samples) distinguished by the number of carbon atoms. All contents referred to in this invention are mass percentages, specifically understood as follows: taking the total mass of all hydrocarbon components extracted by the extractant in the crude oil sample (or separated water sample) as 100%, the content of any extracted hydrocarbon component is the percentage of the mass of that extracted hydrocarbon component relative to the total mass of all hydrocarbon components extracted by the extractant in the crude oil sample (or separated water sample).

[0041] This invention does not limit the technical means for achieving oil-water separation in water-containing crude oil samples. Any technical means capable of achieving oil-water separation in water-containing crude oil samples (such as settling or centrifugation) can be used in this invention.

[0042] The following uses the total carbon number range of n-alkanes as C9-C9. 40 The total carbon number range of cycloalkanes is C9-C6. 40 The total carbon number range of monocyclic aromatic hydrocarbons is C7-C6. 17 The technical solution of the present invention will be described in detail using examples.

[0043] It should be noted that the various carbon number ranges involved in this invention do not constitute a limitation of the invention. In practical applications, those skilled in the art can make appropriate adjustments to the above-mentioned carbon number ranges based on the composition of the aqueous crude oil sample and the crude oil sample and separated water sample obtained after oil-water separation treatment, as well as the detection results of two-dimensional gas chromatography information.

[0044] It should also be noted that the selection of the extraction solution is a prior art. This invention does not specifically limit the type of extraction solution. Generally, commercially available organic solvents that can extract at least n-alkane components, cycloalkane components, and monocyclic aromatic components from crude oil samples and water samples can be used as extraction solutions in this invention.

[0045] Example 1

[0046] This invention provides an oil reservoir water flooding degree evaluation device based on two-dimensional gas chromatography information. This device is used to implement the oil reservoir water flooding degree evaluation method based on two-dimensional gas chromatography information provided by this invention.

[0047] Figure 2 This is a schematic diagram of the structure of the oil reservoir water flooding degree evaluation device based on two-dimensional gas chromatography information provided in an embodiment of the present invention. The following is in conjunction with... Figure 2The oil reservoir water flooding assessment device based on two-dimensional gas chromatography information provided in this embodiment of the invention will be described in detail.

[0048] An oil reservoir water flooding assessment device based on two-dimensional gas chromatography information, used to implement an oil reservoir water flooding assessment method based on two-dimensional gas chromatography information, includes: a two-dimensional gas chromatography information detection module for detecting the two-dimensional gas chromatography information of crude oil samples and separating the two-dimensional gas chromatography information of water samples; and a data processing module (…). Figure 2 (Not shown in the image) is used to obtain two-dimensional gas chromatographic information of crude oil samples and two-dimensional gas chromatographic information of water samples, perform data processing, and evaluate the water flooding degree of the oil layer to which the water-bearing crude oil sample belongs; wherein, the crude oil sample and the water sample are obtained by oil-water separation processing of the water-bearing crude oil sample.

[0049] In this embodiment of the invention, the two-dimensional gas chromatography information detection module includes a sample pretreatment module 1, an automatic sample injection module 2, a one-dimensional gas chromatography column 3, a modulation module 4, a modulation column 5, a two-dimensional gas chromatography column 6, and an information quantification processing module. Figure 2 (not shown in the image);

[0050] The sample pretreatment module 1 is used to automatically and quantitatively extract the extract and the sample to be tested for extraction, obtaining the extracted sample; the automatic injection module 2 is used to automatically and quantitatively inject the extracted sample into the one-dimensional gas chromatography column 1 for primary component separation, obtaining at least three categories of components classified as n-alkane components, cycloalkane components, and monocyclic aromatic components; the modulation module 4 is used to control the modulation column 5, using the modulation column 5 to modulate at least the three categories of components classified as n-alkane components, cycloalkane components, and monocyclic aromatic components, obtaining at least three modulated categories of components, namely modulated n-alkane components, modulated cycloalkane components, and modulated monocyclic aromatic components; the two-dimensional gas chromatography column 6 is used to at least modulate the three categories of components classified as n-alkane components, cycloalkane components, and monocyclic aromatic components. The alkane components, the modulated cycloalkanes, and the modulated monocyclic aromatics are subjected to secondary component separation to obtain at least various n-alkane components, various cycloalkanes, and various monocyclic aromatics components classified by carbon number. The information quantification processing module is used to perform information quantification processing on at least the various n-alkane components, various cycloalkanes, and various monocyclic aromatics components classified by carbon number to obtain the two-dimensional gas chromatographic information of the sample to be tested, including the two-dimensional gas chromatographic information of the n-alkanes, the cycloalkanes, and the monocyclic aromatics of the sample to be tested. The sample to be tested is a crude oil sample or a separated water sample.

[0051] In this embodiment of the invention, the oil reservoir water flooding degree evaluation device based on two-dimensional gas chromatography information further includes a control module 7, and the data processing module and the information quantification processing module are both solidified on the control module 7; furthermore, the oil reservoir water flooding degree evaluation device also includes a display module 8, an information output module 9, and a chassis 10; wherein, the control module 7 is used to control the two-dimensional gas chromatography information detection module, the data processing module, the display module 8, and the information output module 9; the display module 8 and the information output module 9 are respectively used to display and output: two-dimensional gas chromatography information of crude oil samples, two-dimensional gas chromatography information of n-alkanes, two-dimensional gas chromatography information of cycloalkanes, and two-dimensional gas chromatography information of monocyclic aromatic hydrocarbons, two-dimensional gas chromatography information of water samples, two-dimensional gas chromatography information of n-alkanes, two-dimensional gas chromatography information of cycloalkanes, and two-dimensional gas chromatography information of monocyclic aromatic hydrocarbons, and the hydrocarbon value D of crude oil samples. O Hydrocarbon value D of separated water sample W The oil layer water flooding index D, and the evaluation results of the water flooding degree of the oil layer to which the water-bearing crude oil sample belongs; the chassis 10 is used to house the two-dimensional gas chromatography information detection module, data processing module, control module 7, display module 8 and information output module 9.

[0052] Example 2

[0053] This invention provides a method for evaluating the degree of water flooding in oil reservoirs based on two-dimensional gas chromatography information.

[0054] Figure 1 This is a schematic diagram illustrating the steps of the oil reservoir water flooding assessment method based on two-dimensional gas chromatography information provided in an embodiment of the present invention. The following is in conjunction with... Figure 1 The steps of the oil reservoir water flooding assessment method based on two-dimensional gas chromatography information provided in the embodiments of the present invention are described in detail, and further combined with Figure 2 The process of implementing the oil layer water flooding degree evaluation method based on two-dimensional gas chromatography information provided in this embodiment of the invention using the oil layer water flooding degree evaluation device based on two-dimensional gas chromatography information provided in Example 1 is described.

[0055] A method for evaluating the degree of water flooding in an oil reservoir based on two-dimensional gas chromatography information includes: collecting a water-bearing crude oil sample, obtaining a crude oil sample and a separated water sample through oil-water separation processing; acquiring the two-dimensional gas chromatography information of the crude oil sample and the separated water sample, and calculating the water flooding index D; and evaluating the degree of water flooding in the oil reservoir to which the water-bearing crude oil sample belongs based on the two-dimensional gas chromatography information of the crude oil sample, the two-dimensional gas chromatography information of the separated water sample, and the water flooding index D.

[0056] First, collect an appropriate amount (e.g., 500 mL) of water-containing crude oil sample and put it into a sample bottle. Then, extract an appropriate amount (e.g., 100 mL ± 5 mL) of water-containing crude oil sample from the bottle and inject it into a stirrer. Stir the water-containing crude oil sample for 10 minutes and then pour it into a test tube. Let it stand for 24 hours to achieve oil-water separation. The upper layer of the test tube is the crude oil sample, and the lower layer of the test tube is the separated water sample.

[0057] Then, two-dimensional gas chromatography (GC) information detection of crude oil and separated water samples is performed. The following detailed description uses the detection steps of crude oil samples as an example. Under the control of control module 7: Sample pretreatment module 1 automatically and quantitatively extracts crude oil sample (e.g., 20 mL) and injects it into the extraction bottle; it also automatically and quantitatively extracts extractant (e.g., 80 mL) from the extractant container and injects it into the extraction bottle to mix and extract with the crude oil sample, obtaining the extracted sample; Automatic injection module 2 automatically and quantitatively extracts the extracted sample (e.g., 5 μL) and injects it into the one-dimensional gas chromatography column 3 for primary component separation, at least separating components classified as n-alkanes, cycloalkanes, and monocyclic aromatics. Three categories of components; at least three categories of components, distinguished by n-alkane components, cycloalkane components, and monocyclic aromatic components, are transferred to modulation column 5. Modulation module 4 controls modulation column 5 to modulate at least the three categories of components, distinguished by n-alkane components, cycloalkane components, and monocyclic aromatic components, to obtain at least modulated n-alkane components, modulated cycloalkane components, and modulated monocyclic aromatic components. At least the modulated n-alkane components, modulated cycloalkane components, and modulated monocyclic aromatic components are transferred to two-dimensional gas chromatography column 6 for secondary component separation, to separate at least various n-alkane components distinguished by carbon number (e.g., C9-C). 40 Various n-alkanes), and various cycloalkanes classified by carbon number (e.g., C9-C1). 40 Various cycloalkanes) and various monocyclic aromatic hydrocarbons classified by carbon number (e.g., C7-C12). 17 Various monocyclic aromatic hydrocarbons); at least the various n-alkane components, cycloalkane components, and monocyclic aromatic hydrocarbon components classified by carbon number are transmitted to the information quantification processing module for information quantification processing to obtain the two-dimensional gas chromatographic information of the crude oil sample, including the two-dimensional gas chromatographic information of the n-alkane of the crude oil sample (i.e., C9-C1). 40 The content of various n-alkanes), and two-dimensional gas chromatography information of cycloalkanes (i.e., C9-C6). 40 The content of various cycloalkanes) and two-dimensional gas chromatographic information of monocyclic aromatic hydrocarbons (i.e., C7-C6). 17 (Content of various monocyclic aromatic hydrocarbons);

[0058] Under the control of control module 7, the crude oil sample is replaced with an equal amount of separated water sample, and the two-dimensional gas chromatography information of the separated water sample is obtained by detecting it according to the same steps, including the two-dimensional gas chromatography information of n-alkanes of the separated water sample (i.e., C9-C). 40 The content of various n-alkanes), and two-dimensional gas chromatography information of cycloalkanes (i.e., C9-C6). 40 The content of various cycloalkanes) and two-dimensional gas chromatographic information of monocyclic aromatic hydrocarbons (i.e., C7-C6). 17 The content of various monocyclic aromatic hydrocarbons).

[0059] Next, under the control of control module 7, the data processing module automatically acquires the two-dimensional gas chromatographic information of the crude oil sample and separates the two-dimensional gas chromatographic information of the water sample, and automatically calculates the hydrocarbon value D of the crude oil sample. O Hydrocarbon value D of separated water sample W And the oil reservoir water flooding index D;

[0060] Among them, the hydrocarbon value D of the crude oil sample O The following formula was used to calculate the results based on the two-dimensional gas chromatographic information of n-alkanes, cycloalkanes, and monocyclic aromatics from the crude oil sample:

[0061] D NO =q1On 9-10 +q2On 11-15 +q3On 16-20 +q4On 21-25 +q5On 26-30 +q6On 31-35 +q7On 36-40 ;

[0062] D GO =q8Og 9-10 +q9Og 11-15 +q 10 Og 16-20 +q 11 Og 21-25 +q 12 Og 26-30 +q 13 Og 31-35 +q 14 Og 36-40 ;

[0063] D AO =q 15 Oa 7-9 +q 16 Oa 10-12 +q 17 Oa 13-14 +q 18 Oa 15-17 ;

[0064] D O =D NO +D GO +D AO ;

[0065] D NO The value of n-alkane in the crude oil sample is represented by the expression, where On 9-10 On 11-15 On 16-20 On 21-25 On 26-30 On 31-35 On 36-40 C in crude oil samples 9-10 C 11-15 C 16-20 C 21-25 C 26-30 C 31-35 C 36-40 The content of n-alkanes; q1 to q7 are all weighting coefficients, with values ​​ranging independently from 0 to 10, and q1 to q7 are not all 0 at the same time;

[0066] D GO The value of cycloalkanes in the crude oil sample is represented by the expression Og. 9-10 Og 11-15 Og 16-20 Og 21-25 Og 26-30 Og 31-35 Og 36-40 C in crude oil samples 9-10 C 11-15 C 16-20 C 21-25 C 26-30 C 31-35 C 36-40 The content of cycloalkanes; q8 to q 14 All are weighting coefficients, with values ​​independently ranging from 0 to 10, and q8 to q 14 Not both are 0;

[0067] D AO The value of monocyclic aromatic hydrocarbons in the crude oil sample is represented by Oa. 7-9 Oa 10-12 Oa 13-14 Oa 15-17 C in crude oil samples 7-9 C 10-12 C 13-14 C 15-17 The content of monocyclic aromatic hydrocarbons; q 15 to q 18 All are weighting coefficients, with values ​​independently ranging from 0 to 10, and q15 to q 18 Not both are 0;

[0068] Hydrocarbon value D of separated water sample W The following formula was used to calculate the results based on the two-dimensional gas chromatographic information of n-alkanes, cycloalkanes, and monocyclic aromatics from the separated water samples:

[0069] D NW =q 19 Wn 9-10 +q 20 Wn 11-15 +q 21 Wn 16-20 +q 22 Wn 21-25 +q 23 Wn 26-30 +q 24 Wn 31-35 +q 25 Wn 36-40 ;

[0070] D GW =q 26 Wg 9-10 +q 27 Wg 11-15 +q 28 Wg 16-20 +q 29 Wg 21-25 +q 30 Wg 26-30 +q 31 Wg 31-35 +q 32 Wg 36-40 ;

[0071] D AW =q 33 Wa 7-9 +q 34 Wa 10-12 +q 35 Wa 13-14 +q 36 Wa 15-17 ;

[0072] D W =D NW +D GW +D AW ;

[0073] D NW The value of n-alkane in the separated water sample is represented by Wn. 9-10 、Wn 11-15 、Wn 16-20 、Wn21-25 、Wn 26-30 、Wn 31-35 、Wn 36-40 C in the separated water sample 9-10 C 11-15 C 16-20 C 21-25 C 26-30 C 31-35 C 36-40 The content of n-alkanes; q 19 to q 25 All are weighting coefficients, with values ​​independently ranging from 0 to 10, and q 19 to q 25 Not both are 0;

[0074] D GW The value of cycloalkanes in the separated water sample is represented by Wg in its expression. 9-10 Wg 11-15 Wg 16-20 Wg 21-25 Wg 26-30 Wg 31-35 Wg 36-40 C in the separated water sample 9-10 C 11-15 C 16-20 C 21-25 C 26-30 C 31-35 C 36-40 The content of cycloalkanes; q 26 to q 32 All are weighting coefficients, with values ​​independently ranging from 0 to 10, and q 26 to q 32 Not both are 0;

[0075] D AW The value of monocyclic aromatic hydrocarbons in the separated water sample is represented by Wa in its expression. 7-9 Wa 10-12 Wa 13-14 Wa 15-17 C in the separated water sample 7-9 C 10-12 C 13-14 C 15-17 The content of monocyclic aromatic hydrocarbons; q 33 to q 36 All are weighting coefficients, with values ​​independently ranging from 0 to 10, and q 33 to q 36 Not both are 0;

[0076] The reservoir water flooding index D is based on the hydrocarbon value D of the crude oil sample. O And the hydrocarbon value D of the separated water sampleW It is calculated according to the following expression:

[0077]

[0078] In the expression for the reservoir water flooding index D, q 37 and q 38 All are weighting coefficients, q 37 and q 38 All are natural numbers greater than 0.

[0079] Next, under the control of control module 7, the data processing module processes the data based on the hydrocarbon value D of the crude oil sample. O Hydrocarbon value D of separated water sample W The water flooding degree of the oil reservoir to which the water-bearing crude oil sample belongs is automatically evaluated by the intervals of the three values: oil reservoir water flooding index D, and hydrocarbon value D of the crude oil sample. O Hydrocarbon value D of separated water sample W The intervals for the oil reservoir water flooding index (D) and the oil reservoir water flooding index (D) were determined by collecting information on hydrocarbon values ​​of crude oil samples from adjacent drilled wells of water-bearing crude oil samples, hydrocarbon values ​​of separated water samples, oil reservoir water flooding index, and the degree of oil reservoir water flooding, and then using statistical methods.

[0080] Finally, under the control of the control module 7, the display module 8 and the information output module 9 display and output the following information: two-dimensional gas chromatography information of crude oil samples, two-dimensional gas chromatography information of n-alkanes, two-dimensional gas chromatography information of cycloalkanes, and two-dimensional gas chromatography information of monocyclic aromatic hydrocarbons; two-dimensional gas chromatography information of water samples, two-dimensional gas chromatography information of n-alkanes, two-dimensional gas chromatography information of cycloalkanes, and two-dimensional gas chromatography information of monocyclic aromatic hydrocarbons; and the hydrocarbon value D of crude oil samples. O Hydrocarbon value D of separated water sample W The system visualizes the water flooding index D of the oil reservoir and the water flooding degree evaluation results of the oil reservoir to which the water-bearing crude oil sample belongs, as well as the key information and key parameters on which the evaluation results are based.

[0081] The present invention also provides an application example of implementing the oil reservoir water flooding degree evaluation method based on two-dimensional gas chromatography information provided in the embodiments of the present invention using the oil reservoir water flooding degree evaluation device based on two-dimensional gas chromatography information provided in the embodiments of the present invention.

[0082] Application Example 1

[0083] Using the oil reservoir water flooding degree evaluation device based on two-dimensional gas chromatography information provided in Example 1, and the oil reservoir water flooding degree evaluation method based on two-dimensional gas chromatography information provided in Example 2, the water flooding degree of the oil reservoir in well W456 section 6 (4461.7 to 4466.0 meters) and well W456 section 7 (4477.2 to 4484.4 meters) was evaluated.

[0084] The oil-water separation process and the two-dimensional gas chromatography information of the crude oil sample and the separated water sample in the No. 6 section of Well W456 (4461.7 to 4466.0 meters) were carried out according to the following steps: First, 500 mL of oil sample from the No. 6 section of Well W456 (4461.7 to 4466.0 meters) was collected and placed in a sample bottle. Then, 100 mL of oil sample from the No. 6 section of Well W456 (4461.7 to 4466.0 meters) was extracted from the sample bottle and injected into a stirrer. After stirring for 10 minutes, the sample was poured into a test tube and allowed to stand for 24 hours to achieve oil-water separation. The upper layer of the test tube was the crude oil sample, and the lower layer was the separated water sample.

[0085] Then, under the control of control module 7: sample pretreatment module 1 automatically and quantitatively extracts 20 mL of crude oil sample and injects it into the extraction bottle; it also automatically and quantitatively extracts 80 mL of extractant from the extraction liquid container and injects it into the extraction bottle to mix and extract with the crude oil sample, obtaining the extracted sample; automatic injection module 2 automatically and quantitatively extracts 5 μL of the extracted sample and injects it into the one-dimensional gas chromatography column 3 for primary component separation, separating three categories of components: n-alkane components, cycloalkane components, and monocyclic aromatic components; the components are then separated according to the categories of n-alkane components, cycloalkane components, and monocyclic aromatic components. The three categories of components, distinguished by the monocyclic aromatic hydrocarbons, are respectively transferred to modulation column 5. Modulation module 4 controls modulation column 5 to modulate the n-alkane, cycloalkane, and monocyclic aromatic hydrocarbon components, respectively, to obtain modulated n-alkane, modulated cycloalkane, and modulated monocyclic aromatic hydrocarbon components. The modulated n-alkane, modulated cycloalkane, and modulated monocyclic aromatic hydrocarbon components are then transferred to two-dimensional gas chromatography column 6 for secondary component separation, separating various n-alkane components (i.e., C9-C6) according to carbon number. 40 Various n-alkanes), and various cycloalkanes classified by carbon number (i.e., C9-C1). 40 Various cycloalkanes) and various monocyclic aromatic hydrocarbons classified according to carbon number (i.e., C7-C6) 17 Various monocyclic aromatic hydrocarbons); The various n-alkane components, classified by carbon number, the various cycloalkanes, and the various monocyclic aromatic hydrocarbons, classified by carbon number, are respectively transmitted to the information quantification processing module for information quantification processing to obtain the two-dimensional gas chromatographic information of the crude oil sample, including the two-dimensional gas chromatographic information of the n-alkane components of the crude oil sample (i.e., C9-C1). 40The content of various n-alkanes), and two-dimensional gas chromatography information of cycloalkanes (i.e., C9-C6). 40 The content of various cycloalkanes) and two-dimensional gas chromatographic information of monocyclic aromatic hydrocarbons (i.e., C7-C6). 17 (Content of various monocyclic aromatic hydrocarbons);

[0086] Under the control of control module 7, the crude oil sample is replaced with an equal amount of separated water sample, and the two-dimensional gas chromatography information of the separated water sample is obtained by detecting it according to the same steps, including the two-dimensional gas chromatography information of n-alkanes of the separated water sample (i.e., C9-C). 40 The content of various n-alkanes), and two-dimensional gas chromatography information of cycloalkanes (i.e., C9-C6). 40 The content of various cycloalkanes) and two-dimensional gas chromatographic information of monocyclic aromatic hydrocarbons (i.e., C7-C6). 17 (Content of various monocyclic aromatic hydrocarbons);

[0087] Next, following the oil-water separation processing of oil samples from the 4461.7 to 4466.0 meter oil layer in section 6 of well W456, and the two-dimensional gas chromatography (GC) information detection steps for crude oil and separated water samples, the oil samples from the 4461.7 to 4466.0 meter oil layer in section 6 of well W456 were replaced with an equal amount of oil samples from the 4477.2 to 4484.4 meter oil layer in section 7 of well W456. The GC information of the crude oil sample from the 4477.2 to 4484.4 meter oil layer in section 7 of well W456, and the GC information of the separated water sample were obtained. The GC information of the crude oil sample from the 4477.2 to 4484.4 meter oil layer in section 7 of well W456 included the GC information of n-alkanes (i.e., C9-C456). 40 The content of various n-alkanes), and two-dimensional gas chromatography information of cycloalkanes (i.e., C9-C6). 40 The content of various cycloalkanes) and two-dimensional gas chromatographic information of monocyclic aromatic hydrocarbons (i.e., C7-C6). 17 The content of various monocyclic aromatic hydrocarbons); oil-water separation from oil samples in well W456, section 7, from 4477.2 to 4484.4 meters, and two-dimensional gas chromatography information of water samples, including two-dimensional gas chromatography information of n-alkanes (i.e., C9-C6). 40 The content of various n-alkanes), and two-dimensional gas chromatography information of cycloalkanes (i.e., C9-C6). 40 The content of various cycloalkanes) and two-dimensional gas chromatographic information of monocyclic aromatic hydrocarbons (i.e., C7-C6). 17 The content of various monocyclic aromatic hydrocarbons).

[0088] Then, under the control of control module 7: the data processing module automatically acquires the two-dimensional gas chromatography information of crude oil samples from the oil layer of well W456, section 6 (4461.7 to 4466.0 meters), as well as the two-dimensional gas chromatography information of the separated water sample; it also acquires the two-dimensional gas chromatography information of crude oil samples from the oil layer of well W456, section 7 (4477.2 to 4484.4 meters), as well as the two-dimensional gas chromatography information of the separated water sample; and automatically calculates the hydrocarbon value D of the crude oil sample from the formation of well W456, section 6 (4461.7 to 4466.0 meters). O Hydrocarbon value D of separated water sample W And the oil reservoir water flooding index D, and the hydrocarbon value D of crude oil samples from the 4477.2 to 4484.4 meter section of well No. 7 in well W456. O Hydrocarbon value D of separated water sample W And the oil reservoir water flooding index D;

[0089] Among them, the hydrocarbon value D of the crude oil sample O The hydrocarbon value D of the separated water sample was calculated based on the two-dimensional gas chromatography information of n-alkanes, cycloalkanes, and monocyclic aromatics from the crude oil sample. W The reservoir water flooding index D was calculated based on the two-dimensional gas chromatography information of n-alkanes, cycloalkanes, and monocyclic aromatics from the separated water sample; the oil reservoir water flooding index D was calculated based on the hydrocarbon value D of the crude oil sample. O And the hydrocarbon value D of the separated water sample W The calculated hydrocarbon value D of the crude oil sample was obtained. O Hydrocarbon value D of separated water sample W The expression for the reservoir water flooding index D is given in Example 2 above and will not be repeated here;

[0090] The hydrocarbon value D of the crude oil sample from the 4461.7 to 4466.0 meter oil layer in section 6 of well W456. O Hydrocarbon value D of separated water sample W The calculation results of the reservoir water flooding index D and the hydrocarbon values ​​D of crude oil samples from the 4477.2 to 4484.4 meter oil layer in section 7 of well W456. O Hydrocarbon value D of separated water sample W The calculation results of the oil reservoir water flooding index D are shown in Table 1.

[0091] Table 1. Oil layer depth of 4461.7 to 4466.0 meters in section 6 of well W456 and oil layer depth of 4477.2 to 4484.4 meters in section 7 of well W456. O D W and D

[0092]

[0093] Under the control of the control module 7, the data processing module automatically determines the hydrocarbon values ​​D of the crude oil samples from the two oil layers based on the test results shown in Table 1. O Hydrocarbon value D of separated water sample w After determining the intervals to which the oil reservoir water flooding index D belongs, the system automatically assesses that the oil reservoir in well section 6 of W456 (4461.7 to 4466.0 meters) is slightly water flooded, and the oil reservoir in well section 7 of W456 (4477.2 to 4484.4 meters) is moderately water flooded.

[0094] Verification of oil reservoir water flooding degree evaluation results

[0095] The oil testing results of the oil layer in section 6 of well W456 (4461.7 to 4466.0 meters) and section 7 of well W456 (4477.2 to 4484.4 meters) are consistent with the above evaluation results, proving that the above evaluation results are correct.

[0096] Although the present invention describes the steps of the oil reservoir water flooding assessment method based on two-dimensional gas chromatography information in a certain order, this does not imply a limitation on the order in which the steps of the method are implemented. Those skilled in the art can flexibly adjust the order of the steps of the method without affecting its implementation.

[0097] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0098] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0099] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0100] Certain terms are used throughout this application to refer to specific system components. As those skilled in the art will recognize, the same components may often be referred to by different names, and therefore this application is not intended to distinguish components that differ only in name and not in function. The terms "an embodiment" or "embodiment" used in the specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "embodiment" appearing throughout the specification does not necessarily refer to the same embodiment.

[0101] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

[0102] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and / or modifications falling within the scope of the invention, and all changes and / or modifications made according to embodiments of the invention should be covered within the protection scope of the invention.

Claims

1. A method for evaluating the degree of water flooding in oil reservoirs based on two-dimensional gas chromatography information, comprising: A water-containing crude oil sample was collected, and crude oil and water samples were obtained through oil-water separation. Obtain the two-dimensional gas chromatographic information of the crude oil sample and the two-dimensional gas chromatographic information of the separated water sample, and calculate the oil reservoir water flooding index D; Based on the two-dimensional gas chromatography information of the crude oil sample, the two-dimensional gas chromatography information of the separated water sample, and the oil layer water flooding index D, the degree of water flooding of the oil layer to which the water-bearing crude oil sample belongs is evaluated.

2. The method according to claim 1, characterized in that, The two-dimensional gas chromatographic information of the crude oil sample includes two-dimensional gas chromatographic information of n-alkanes, cycloalkanes, and monocyclic aromatics; and / or The two-dimensional gas chromatographic information of the separated water sample includes two-dimensional gas chromatographic information of n-alkanes, cycloalkanes, and monocyclic aromatic hydrocarbons of the separated water sample.

3. The method according to claim 2, characterized in that, Calculate the hydrocarbon value D of the crude oil sample O ; The hydrocarbon value D of the crude oil sample O The calculations were based on the two-dimensional gas chromatographic information of n-alkanes, cycloalkanes, and monocyclic aromatics from the crude oil sample.

4. The method according to claim 3, characterized in that, Calculate the hydrocarbon value D of the separated water sample W ; The hydrocarbon value D of the separated water sample W The results were calculated based on the two-dimensional gas chromatographic information of n-alkanes, cycloalkanes, and monocyclic aromatics of the separated water sample.

5. The method according to claim 4, characterized in that, The reservoir water flooding index D is based on the hydrocarbon value D of the crude oil sample. O And the hydrocarbon value D of the separated water sample W Calculated.

6. The method according to claim 5, characterized in that, Combined with the hydrocarbon value D of the crude oil sample O Hydrocarbon value D of separated water sample W The water flooding index D is used to evaluate the degree of water flooding in the oil layer to which the water-bearing crude oil sample belongs.

7. The method according to claim 2, characterized in that, The sample to be tested and the extract solution were extracted to obtain the extracted sample. The extracted sample is subjected to primary component separation to separate at least three categories of components, namely, n-alkane components, cycloalkane components, and monocyclic aromatic components. At least the three types of components are modulated respectively to obtain at least the three types of components modulated; At least the three types of modulated components are subjected to secondary component separation to obtain at least various n-alkane components, various cycloalkane components, and various monocyclic aromatic components, distinguished by carbon number. At least the various n-alkane components, cycloalkane components, and monocyclic aromatic components classified by carbon number are subjected to information quantification processing to obtain the two-dimensional gas chromatographic information of the sample to be tested, including the two-dimensional gas chromatographic information of the n-alkane, cycloalkane, and monocyclic aromatic components of the sample to be tested; the sample to be tested is the crude oil sample or the separated water sample.

8. A device for evaluating the degree of water flooding in oil reservoirs based on two-dimensional gas chromatography information, characterized in that, The apparatus is used to implement the method as described in any one of claims 1 to 7, comprising: A two-dimensional gas chromatography information detection module is used to detect the two-dimensional gas chromatography information of the crude oil sample and the two-dimensional gas chromatography information of the separated water sample; The data processing module is used to acquire the two-dimensional gas chromatography information of the crude oil sample and the two-dimensional gas chromatography information of the separated water sample, perform data processing, and evaluate the water flooding degree of the oil layer to which the water-bearing crude oil sample belongs.

9. The application of the method for evaluating the degree of water flooding in oil reservoirs based on two-dimensional gas chromatography information according to any one of claims 1 to 7, or the device for evaluating the degree of water flooding in oil reservoirs based on two-dimensional gas chromatography information according to claim 8, in petroleum geological logging.

10. A hardware storage device having computer-executable instructions stored thereon, characterized in that, When the computer execution instructions are executed by the processor, they implement the steps of the oil layer water flooding evaluation method based on two-dimensional gas chromatography information as described in any one of claims 1 to 7.

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