阅读说明：本技术 一种利用色谱图版识别高凝油的方法 (Method for identifying high-condensation oil by using chromatographic plate ) 是由 徐婕 宋义民 姜维寨 孟庆峰 戴广阔 李毅逵 陈永红 王金友 陈京原 颜怀羽 乔 于 2019-11-12 设计创作，主要内容包括：本发明涉及利用色谱图版识别高凝油的方法,进行岩石热解气相色谱分析,计算相对峰面积＝分析样品的各饱和烃组分含量/样品质量；计算分析样品中的蜡主要成分及轻质成分的峰面积,分别记作M<Sub>1</Sub>、M<Sub>2</Sub>,并求取高凝油敏感参数蜡轻比及蜡总比；以蜡轻比为X轴,以蜡总比为Y轴,建立二维直角坐标系,把解释目标区已经试油证实的样本点的蜡轻比和蜡总比数据在二维直角坐标系中进行交汇,进行曲线拟合；把需要解释层的相应参数在图版中交汇,依据交汇出的点所处图版位置对其原油性质进行判断。本发明可有效地解决随钻过程中原油性质的判识,为后期试采工艺的优选提供技术支撑,从而提高试采成功率。(The invention relates to a method for identifying high pour point oil by using a chromatographic plate, which is used for carrying out rock pyrolysis gas chromatography analysis, and calculating the relative peak area, namely the content of each saturated hydrocarbon component/the quality of an analysis sample; calculating peak areas of main wax component and light component in the sample, and respectively recording as M 1 、M 2 And calculating the light wax ratio and the total wax ratio of high pour point oil sensitive parameters; establishing a two-dimensional rectangular coordinate system by taking the wax light ratio as an X axis and the wax total ratio as a Y axis, and intersecting the wax light ratio of sample points which are proved by oil testing in an explanation target area and the wax total ratio data in the two-dimensional rectangular coordinate system to perform curve fitting; and (4) intersecting the corresponding parameters of the layers to be explained in the plate, and judging the crude oil property of the layers according to the plate position where the intersected point is located. The invention can effectively solve the problem of the identification of the crude oil property in the process of drilling at the later stageThe optimization of the trial production process provides technical support, so that the trial production success rate is improved.)

1. A method for identifying high pour point oil by using a chromatographic plate is characterized by comprising the following steps: the method comprises the following steps:

s1, performing rock pyrolysis gas chromatography by using a borehole wall coring or rock core sample, obtaining the content of each saturated hydrocarbon component of the analysis sample according to a spectrogram, and calculating a relative peak area, wherein the relative peak area is the content/sample mass of each saturated hydrocarbon component of the analysis sample;

s2, calculating peak areas of the main wax component and the light component in the analysis sample according to the spectrogram in the step S1, and respectively recording the peak areas as M₁、M₂And calculating the light wax ratio and the total wax ratio of high pour point oil sensitive parameters;

wherein, the light ratio of the high pour-point oil sensitive parameter wax is as follows: m₁/M₂(ii) a The total ratio of wax is: m₁Relative peak area;

s3, establishing a two-dimensional rectangular coordinate system by taking the wax light ratio as an X axis and the wax total ratio as a Y axis, intersecting the wax light ratio and the wax total ratio data of sample points which are confirmed by oil testing in an explanation target area in the two-dimensional rectangular coordinate system, and fitting a curve according to the high pour point oil sample points or the normal oil sample points to obtain a boundary trend line of the high pour point oil and the normal oil, thereby establishing a chart plate taking the trend line as the boundary of a high pour point oil area and a normal oil area;

and S4, intersecting the corresponding parameters of the layers to be explained in the plate, judging the crude oil property according to the plate position of the intersected point, judging as high-condensation oil if the intersected point is in a high-condensation oil area, and judging as normal oil if the intersected point is in a normal oil area.

2. The method for identifying high pour point oil by using chromatographic plate as claimed in claim 1, wherein: the peak area of the main component of the wax isThe peak area of the light component is

Technical Field

The invention belongs to the technical field of special oil and gas identification while drilling, and particularly relates to a method for identifying high-condensation oil by using a chromatographic chart.

Background

At present, the interpretation and evaluation of gas logging hydrocarbon reservoirs mainly judge the fluid properties according to the height of the display value of the total hydrocarbon, the curve form and the composition of hydrocarbon components, and predict the density of crude oil according to the pyrolysis parameters of rocks to distinguish heavy oil from medium oil.

However, the probe area in the hope develops a special medium oil, the wax content of the special medium oil is 33-40%, the freezing point is 40-67 ℃, the wax precipitation temperature is 60-74 ℃, and the special medium oil belongs to high-condensation oil. In the process of well logging interpretation and evaluation, because high pour point oil is difficult to effectively identify, contradiction between an oil layer and a dry layer exists in interpretation. The logging response characteristic reaction is an oil layer, the logging response characteristic is a dry layer, and crude oil is in a solidification state at the temperature lower than 40 ℃, so that the flowability of the crude oil is poor, and the conventional pilot production process is difficult to effectively produce the crude oil. At present, no effective technology exists in the logging industry for identifying high-pour-point oil in the process of drilling, and a method for distinguishing the high-pour-point oil from normal oil is urgently needed.

Therefore, based on the problems, the method for identifying the high-pour-point oil by using the chromatographic chart, which can effectively solve the problem of identification of crude oil properties in the process of drilling and provides technical support for optimization of a later pilot production process so as to improve the success rate of pilot production, has important practical significance.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides a method for identifying high-pour-point oil by using a chromatographic chart, which can effectively solve the problem of identification of crude oil properties in the process of drilling and provide technical support for optimization of a later trial production process so as to improve the success rate of trial production.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

a method for identifying high pour point oil using a chromatography plate, the method comprising the steps of:

s1, performing rock pyrolysis gas chromatography by using a borehole wall coring or rock core sample, obtaining the content of each saturated hydrocarbon component of the analysis sample according to a spectrogram, and calculating a relative peak area, wherein the relative peak area is the content/sample mass of each saturated hydrocarbon component of the analysis sample;

s2, calculating peak areas of the main wax component and the light component in the analysis sample according to the spectrogram in the step S1, and respectively recording the peak areas as M₁、M₂And calculating the light wax ratio and the total wax ratio of high pour point oil sensitive parameters;

wherein, the light ratio of the high pour-point oil sensitive parameter wax is as follows: m₁/M₂(ii) a The total ratio of wax is: m₁Relative peak area;

s3, establishing a two-dimensional rectangular coordinate system by taking the wax light ratio as an X axis and the wax total ratio as a Y axis, intersecting the wax light ratio and the wax total ratio data of sample points which are confirmed by oil testing in an explanation target area in the two-dimensional rectangular coordinate system, and fitting a curve according to the high pour point oil sample points or the normal oil sample points to obtain a boundary trend line of the high pour point oil and the normal oil, thereby establishing a chart plate taking the trend line as the boundary of a high pour point oil area and a normal oil area;

and S4, intersecting the corresponding parameters of the layers to be explained in the plate, judging the crude oil property according to the plate position of the intersected point, judging as high-condensation oil if the intersected point is in a high-condensation oil area, and judging as normal oil if the intersected point is in a normal oil area.

It is noted that paraffin is a mixture of solid higher alkanes, and the main component has the molecular formula of C_nH_2n+2Wherein n is 17-35, the main component is straight-chain alkane, and a small amount of alkane with individual branched chains and monocyclic cycloalkane with long side chains; among the linear alkanes is mainly n-docosane (C)₂₂H₄₆) And n-octacosane (C)₂₈H₅₈) The wax in crude oil is generally straight-chain paraffin with more than C17, the branched chain is few, and the carbon number of the wax molecule is high and can reach more than 70; the difference in physical properties is large due to the difference in molecular weight of the waxes in the high pour point oil. The statistical results of the SulGrozni oil field show that: the greater the number of carbon atoms of the wax in the crude oil, the higher the melting point of the wax (i.e., the wax melting temperature), and the smaller the number of carbon atoms of the wax in the crude oil, the lower the melting point of the wax; since wax exists in the high pour point oil in a molecular form, melting and precipitation of the wax are physical phenomena, namely, the wax precipitation temperature is closely related to the highest carbon number of the wax in the crude oil, namely, the smaller the highest carbon number of the wax in the crude oil is, the lower the wax precipitation temperature is; the greater the highest number of carbon atoms of the wax in the crude oil, the higher the wax precipitation temperature.

By analogy with the component characteristics, dominant peaks, oil sources, n-alkane peak areas and chromatographic spectrograms of red wax, white wax, high pour point oil and normal oil, the relatively high alkane peaks of the spectrograms of the paraffin are concentrated at C24-C27, so that a calculation formula of the peak area of the main component of the wax is obtained, wherein the peak area of the main component of the wax is

The peak area of the light component isIn addition, C is_nH_2n+2(n.ltoreq.19) are all light, but C of paraffin_nH_2n+2(10. ltoreq. n. ltoreq.15) has a lower relative peak area and is more representative of high pour point oil, so C is selected_nH_2n+2(10. ltoreq. n. ltoreq.15) as a light component.

The invention has the advantages and positive effects that:

1. the method effectively solves the problem of rapidly identifying the high pour point oil while drilling, provides scientific basis for the selection of a pilot production process, and improves the overall benefit of exploration and development;

2. aiming at the difficulty that the identification of the high-pour-point oil is exploration at present, no effective identification method is used for identifying the high-pour-point oil, and after the method is established, theoretical basis and technical support are laid for the effective identification of the high-pour-point oil, and a favorable basis is provided for the quick and accurate identification of the high-pour-point oil for exploration, so that a basis is provided for the selection of an oil testing process.

Drawings

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.

FIG. 1 is a schematic diagram of a high pour point oil chromatography identification plate for identification in a certain area according to an embodiment of the present invention;

Detailed Description

First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any individual technical features described or implicit in the embodiments mentioned herein may still be continued in any combination or subtraction between these technical features (or their equivalents) to obtain still further embodiments of the invention that may not be mentioned directly herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The present invention will be specifically described with reference to fig. 1.