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Sandstone wettability evaluating method

An evaluation method and wettability technology, which is used in the preparation of test samples, soil material testing, material inspection products, etc., and can solve the problem of complex testing process, inability to accurately reflect the wetting status, and sensitive to neutral wet samples. problems such as poor performance, to achieve the effect of reducing the siphon phenomenon

Inactive Publication Date: 2015-09-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

The contact angle method is simple and fast. It is the most intuitive and simple method to measure the wettability of crude oil and brine on polished minerals. It is also the best method for pure fluids and artificial cores, but there are many uncertainties. , poor repeatability; the testing process of Amott method is complicated, but it is less sensitive to samples with neutral wetting; the testing process of USBM method is relatively simple, and it is more sensitive to samples with neutral wetting
However, none of them can accurately reflect the wettability of sandstone reservoir conditions.

Method used

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  • Sandstone wettability evaluating method

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Embodiment Construction

[0014] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0015] figure 1 It is a flow chart of a specific embodiment of the sandstone-based wettability evaluation method of the present invention. In step 101, a core slice is prepared. After the rock core sample to be tested is sliced, it is ground into a rock core slice with a thickness of less than 0.2 cm by polishing machine. The process goes to step 102.

[0016] In step 102, the crude oil sample to be tested is dropped on the surface of the core slice. At room temperature, drop 1.5 μL of the crude oil sample to be tested on the surface of the core slice prepared according to step 101. The process goes to step 103.

[0017] In step 103, the core slice is immersed in the solution in the sample chamber of the dynamic contact angle measuring instr...

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Abstract

The invention provides a sandstone wettability evaluating system. The sandstone wettability evaluating method comprises the following steps: 1, preparing a rock core slice; 2, adding a crude oil sample to be measured to the surface of the rock core slice in a dropwise manner; 3, immersing the rock core slice in a solution in a sample groove of a dynamic contact angle determination instrument; and 4, detecting the dynamic change of the contact angle of the crude oil with the interface of the rock slice. The sandstone wettability evaluating method overcomes the problem of unable determination of the contact angle of the crude oil on the surface of the rock in an aqueous solution with high oil-water interface activity and strong wetting reversion ability, and realizes control of the ambient temperature in the dynamic determination process.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a sandstone-based wettability evaluation method. Background technique [0002] Low-permeability reservoirs generally have the problems of deep burial, poor reservoir physical properties, poor seepage capacity, and unsuitable production technology. The wettability of reservoirs is dominated by hydrophilic sandstone. The contradiction of "no injection and no production" in permeable reservoirs can effectively improve the water flooding recovery of low permeability oilfields. However, a lot of research work on wettability control has been carried out for carbonate and limestone fractured reservoirs at home and abroad, mainly including wettability evaluation methods, wettability control technologies, and rock changes from oil-wet to water-wet. However, there is no research report on the use of wettability control technology to enhance oil recovery in sandstone reservoir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N33/24
Inventor 张继超程玉桥马宝东周敏张书栋汤战宏张文张林彦丁玉娟林永红
Owner CHINA PETROLEUM & CHEM CORP
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