Test method for original water saturation of irregular full-diameter rock samples from sealed coring
A testing method and full-diameter technology, which can be used in soil material testing, material inspection, etc., can solve the problems of irregular appearance and shape of sealed coring cores, can not meet the needs of testing and analysis, and achieve the effect of avoiding the loss of water saturation
Active Publication Date: 2016-03-23
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
In order to avoid the water loss caused by the above method in the process of core processing before testing, at present, airtight core cores are mostly used for test analysis, but the appearance and shape of the existing airtight core cores are irregular, and the dry distillation and distillation methods stipulated in industry standards Cannot meet the needs of test analysis
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Embodiment Construction
[0018] The present invention will be further described below according to the examples.
[0019] The method for testing the original water saturation of the irregular full-diameter rock sample with sealed coring includes the following steps in sequence:
[0020] (1) An irregular full-diameter closed coring wax-sealed core in an oil field has a length of 25 cm, an irregular cross-section, and a weight of W 1 =2.098kg; put it into the measuring cylinder, and calculate the apparent volume V of the wax-sealed rock core 1 =938.5ml
[0021] (2) remove the paraffin wax on the surface of the rock core, and weigh the rock core W 2 =2.049kg; calculate the paraffin wax quality W=0.049kg, look up the table to obtain the paraffin wax density ρ 石 =0.893g / ml, so as to determine the volume V of paraffin wax used in the sealed rock core 2 = 54.8ml.
[0022] (3) Put the wax-free rock core into the extraction device, heat and extract at 380°C for 221 hours, and extract the water volume V w...
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Abstract
The invention discloses a method for testing the original water saturation of a sealed coring irregular full-diameter rock sample. The method comprises the following steps: (1) weighing an irregular wax-sealed rock core taken from a job site, and determining the appearance volume of the wax-sealed rock core; (2) determining the volume of wax used for sealing the rock core; (3) putting the rock core without wax into an extraction device, and heating the rock core at 380 DEG C for extraction until the water volume in a condenser pipe is not increased anymore; (4) taking the rock core out, cleaning, drying and weighing the rock core, and calculating the density of the full-diameter rock core; (5) cutting the two ends of the irregular full-diameter rock core, and calculating the volume of the full-diameter rock core; (6) performing porosity test on the full-diameter rock core after cutting to determine the porosity of the rock core, and calculating the pore volume; (7) calculating the volume of water contained in a rock block which is obtained after cutting off end surface parts of the irregular full-diameter rock core; and (8) calculating the water saturation of the full-diameter rock core. The method disclosed by the invention is simple to operate, high in experimental data accuracy and wide in adaptability, and the loss of the water saturation in a processing link of the rock core in a test by using a conventional method is avoided.
Description
technical field [0001] The invention relates to a method for testing the original water saturation of a full-diameter rock sample with closed coring and irregular appearance and shape in the field of oil and gas exploration and development. Background technique [0002] The original water saturation of oil and gas reservoirs is one of the important parameters in the evaluation of oil and gas reservoir exploration and development, which directly affects the accuracy of oil and gas reservoir reserve calculation and the formulation of development technology policies. There are many methods for determining the initial water saturation of oil and gas reservoirs, which can be roughly divided into two categories according to the determination ideas: one is the direct determination method; the other is the indirect determination method. The direct determination method is the core analysis method; the indirect determination method mainly refers to the logging method (such as resistiv...
Claims
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IPC IPC(8): G01N33/24
Inventor 汪周华顾蒙郭平王子敦杜建芬李赟王昊
Owner SOUTHWEST PETROLEUM UNIV