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Method and device for measuring oil saturation of rock sample

A rock sample and saturation technology, applied in the field of petroleum exploration, can solve problems such as complicated operation, poor timeliness, and unsatisfactory performance, and achieve the effects of high measurement accuracy, fast analysis, and strong real-time performance

Inactive Publication Date: 2018-12-07
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the evaluation of oiliness of reservoirs on the drilling site, this method mainly has the following shortcomings: the data obtained by this method is simulated by the gray value formed by the signal attenuation after X-ray irradiation, not the direct measurement value
Its working principle is to emit X-rays through the X-ray tube, and the rays pass through the measured object. Due to the relationship between the material, density and thickness of the measured object, the rays will have different degrees of attenuation. The difference in gray value is used to distinguish the distribution state of oil, water, rock particles and pores in rock samples; the analysis object of this method is fresh rock samples, and it cannot analyze small particle size cuttings samples, and cannot The oiliness of reservoirs is evaluated for uncored wells; when distinguishing oil, water, rock particles and pores, they are distinguished by gray value, which is subject to large human interference factors and requires extremely high experience for analysts; this technology involves radioactive risks , complex operation, inability to conduct analysis while drilling, poor timeliness, and cannot meet the requirements of timely deployment of on-site construction plans; this method is mainly used to quantitatively analyze the microcosmic occurrence state of tight oil, and is mainly used in the field of oil exploitation, without mentioning oil saturation calculation, and oil saturation is an important parameter for reservoir oiliness evaluation

Method used

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  • Method and device for measuring oil saturation of rock sample
  • Method and device for measuring oil saturation of rock sample
  • Method and device for measuring oil saturation of rock sample

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] see figure 1 A schematic flow chart of a method for determining the oil saturation of a rock sample provided in Embodiment 1 of the present invention, the method includes the following steps:

[0045] S11. Making the collected rock sample of the target layer into a sample to be analyzed;

[0046] Specifically, the collected rock samples of the target layer are fresh core or cutting samples collected at the oil well site. The rock samples collected on site were frozen and sliced, and the samples were cut and ground at a ground temperature of 0-5°C to ensure that the original form of the fluid in the gap would not be destroyed during grinding.

[0047] S12. Calculate the total volume of crude oil in the voids of the sample to be analyzed;

[0048] S13. Perform colored solvent perfusion on the sample to be analyzed, and calculate the volume of the total pores of the rock in the sample to be analyzed after perfusion;

[0049] S14. Calculate the oil saturation S of the sa...

Embodiment 2

[0052] Referring to embodiment one of the present invention and figure 1 For the specific process of steps S11 to S14 described in , after obtaining the sample to be analyzed, it is necessary to calculate the total volume of crude oil in the voids of the sample to be analyzed. For details, see figure 2 Corresponding to the second embodiment of the present invention figure 1 A schematic flow chart of calculating the total volume of crude oil in the void in the step S12 shown in , the step S12 specifically includes:

[0053] S121. Perform laser confocal scanning on the sample to be analyzed to obtain a three-dimensional structure diagram of crude oil and rock skeleton;

[0054] S122, performing stripping processing on the three-dimensional structure stereogram of the crude oil and rock skeleton, to obtain the stereogram of crude oil and the stereogram of rock skeleton;

[0055] S123. Calculate and obtain the total volume of crude oil in voids of the sample to be analyzed acco...

Embodiment 3

[0064] Corresponding to the methods for measuring the oil saturation of rock samples disclosed in Embodiments 1 and 2 of the present invention, Embodiment 3 of the present invention also provides a device for measuring the oil saturation of rock samples, see Figure 4 A schematic structural diagram of a rock sample oil saturation determination device provided in Example 3, the device includes:

[0065] The sample making module 1 is used to make the rock sample of the target layer collected into the sample to be analyzed;

[0066] The first calculation module 2 is used to calculate the total volume of crude oil in the voids of the sample to be analyzed;

[0067] The second calculation module 3 is used for perfusing the sample to be analyzed with a colored solvent, and calculating the volume of the total pores of the rock of the sample to be analyzed after perfusion;

[0068] The third calculation module 4 is used to calculate the oil saturation S of the sample to be analyzed ...

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Abstract

The invention discloses a method and device for measuring the oil saturation of a rock sample. The method comprises the steps that a collected rock sample of a target layer is manufactured into the sample to be analyzed; a total volume of crude oil in voids of the sample to be analyzed is calculated; the sample to be analyzed is subjected to colored solvent perfusion, and the volume of total poresof rock of the sample to be analyzed after perfusion is calculated; and the oil saturation of the sample to be analyzed is calculated through the total volume of the crude oil in the voids and the volume of the total pores of the rock. The purposes of direct measurement of the oil saturation of the rock and real-time rapid analysis of the oil saturation of the rock at a drilling site are realized.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method and device for measuring oil saturation of rock samples. Background technique [0002] In the field of petroleum exploration and development technology, the oil saturation is usually measured, and the oil saturation is the percentage of the ratio of the volume of pores occupied by crude oil in the oil layer to the total pore volume of the rock, and is an important parameter for evaluating the oiliness of the reservoir. [0003] In the current research, the main methods to determine the oil saturation are laboratory analysis, logging simulation calculation and field logging analysis. In the method of laboratory analysis of oil saturation, the loss of oil and water and the shedding of loose rock sample particles will affect the accuracy of the measurement, and the measured data needs to be back-calculated and corrected, which will make the cycle longer. Gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCE21B49/00
Inventor 王舒李油建潘素倩乔兰勇李美君刘丽真
Owner 中石化石油工程技术服务有限公司