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Method for reversing gas humidity on surface of rock core by using cationic fluorocarbon surfactant

A wetting reversal, sandstone technology, applied in the direction of chemical instruments and methods, earth drilling, drilling composition, etc., can solve the problems of danger, inconvenient use, formation damage, etc., to avoid pollution, safe and convenient to use , good water solubility

Active Publication Date: 2013-11-06
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In 2008, Yao Tongyu et al. published an article titled "The Effect of Gas Moisture on the Permeability Characteristics of Condensate Gas Reservoirs" on pages 101-104 of Volume 25, Issue 2 of "Oilfield Chemistry", reporting that dodecylbenzenesulfonic acid Chemical agents such as sodium, cetyltrimethylammonium bromide, octylphenol polyoxyethylene ether OP-15, dimethyl silicone oil GB-2201, and dichlorodimethylsilane can effectively remove the sandstone surface from strong Liquid-wet turns into vapor-wet, but they are inconvenient to use and somewhat dangerous
[0005] The surfactants used in the above methods fail to transform the core surface into an ideal preferential gas-wet surface, where silicones and polymers are inconvenient to use and cause formation damage

Method used

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  • Method for reversing gas humidity on surface of rock core by using cationic fluorocarbon surfactant
  • Method for reversing gas humidity on surface of rock core by using cationic fluorocarbon surfactant
  • Method for reversing gas humidity on surface of rock core by using cationic fluorocarbon surfactant

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The wetting inversion treatment agent is an aqueous solution composed of cetyltrimethylammonium bromide and cationic fluorocarbon surfactant FC911, the mass percentage of FC911 is 0.1%, and the mass percent of cetyltrimethylammonium bromide and FC911 The ratio is 1:99.

[0040] Sandstone surface wetting reversal test method: first slice the sandstone core to make a core slice with a diameter of 2.5cm and a thickness of about 1cm, and polish the surface smooth. Then the core slices were cleaned with ethanol and acetone. Soak the core piece in the wetness inversion treatment agent, treat it at 25° C. for 10 hours, and then take out the core piece to dry or oven dry at room temperature.

[0041] The wettability of the surface of the core slice is measured using the stop-drop method, and the specific measurement method is as follows:

[0042] Put the processed core piece on the instrument stage, then suck water and oil with a micro-sampler, and drop water droplets and oil...

Embodiment 2

[0046] As described in Example 1, the difference is that the mass concentration of FC911 in the wetting inversion treatment agent solution is 0.2%.

[0047] This embodiment measures the contact angle of the rock core surface after the treatment, and the contact angle of the salt water\air\sandstone system is 72° (such as image 3 shown), the contact angle of n-decane\air\sandstone system is 68° (such as Figure 9 shown).

Embodiment 3

[0049] As described in Example 1, the difference is that the mass concentration of FC911 in the wetting inversion treatment agent solution is 0.3%. The surface contact angle of the rock core is measured after the treatment of this embodiment, and the contact angle of the salt water\air\sandstone system is 80° (such as Figure 4 shown), the contact angle of n-decane\air\sandstone system is 74° (such as Figure 10 shown).

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Abstract

The invention relates to a method for reversing gas humidity on the surface of a rock core by using cationic fluorocarbon surfactant. The humidity reserving treatment agent used by the method contains the cationic fluorocarbon surfactant, a quaternary ammonium salt surfactant and a polar fluid, preferably FC911, hexadecyl trimethyl ammonium bromide and water. The invention also provides a method for reversing the humidity on the surface of sandstone into gas humidity, which comprises: pumping a humidity reversing treatment agent which contains 0.1 to 1 weight percent of cationic fluorocarbon surfactant into a rock stratum of a gas oil well till the entire surface of the sandstone in the rock stratum is immersed in the humidity reversing treatment agent; and thus, realizing the reversion into the gas humidity on the surface of the rock core. The method can effectively reserve the liquid humidity on the surface of the sandstone into gas humidity. The method is simple, convenient and easy.

Description

technical field [0001] The invention relates to a method for increasing the output of condensate gas reservoirs and protecting oil and gas layers, in particular to a method for changing the surface wettability of formation rocks from oil-wet or water-wet to intermediate gas-wet by using cationic fluorocarbon surfactants. Background technique [0002] China's oil and gas resources are increasingly becoming a bottleneck restricting my country's social and economic development. The wettability of rock surface in oil and gas layers is not only the key factor controlling the flow and distribution of oil and gas layer fluids in pore media, but also has a great influence on the relative permeability and recovery factor of oil, gas and water in oil and gas layers. In tight low-permeability gas reservoirs, gas permeability is often significantly reduced due to water blockage and condensate accumulation. Water clogs are caused by water injected by hydraulic fracturing. Condensate ac...

Claims

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Application Information

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IPC IPC(8): C09K8/584E21B43/22
Inventor 蒋官澄马莉王彦玲刘承杰金家锋徐超
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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