Wetting reversal surfactant for drilling fluid
A technique of surfactant and wetting reversal, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as the drop of demulsification voltage, the reduction of oil well production, and the increase of drilling fluid loss, and achieve the goal of breaking Increased milk voltage, no effect on rheology, and good compatibility
Active Publication Date: 2011-02-16
SICHUAN ZHENGRONG IND +1
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Problems solved by technology
[0002] As the drilling progresses, the hydrophilic cuttings in the formation continuously invade the oil-based drilling fluid, and the existence of a large amount of hydrophilic substances makes it difficult to control the rheology of the drilling fluid, the fluid loss of the drilling fluid increases, and the demulsification voltage increases significantly. decline
At the same time, during the drilling, completion, production and stimulation of oil wells, water accumulates on the well wall, causing water plugging, which reduces the permeability of crude oil, that is, hinders the flow of crude oil from the formation to the oil well, and reduces the production of the oil well. If the well wall is soaked, it is very easy to cause the instability of the well wall and easily cause accidents such as oil well collapse
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[0023] The present invention will be further described below in conjunction with embodiment;
[0024] A wetting inversion surfactant for drilling fluid, the wetting inversion surfactant is made of the following ingredients by weight percentage:
[0025] Lauryltrimethylammonium Bromide 10%
[0026] Heavy Oil 15%
[0027] Fatty acids 20%
[0028] water 55%
[0029] The method for preparing the wetting and inverting surfactant for drilling fluid is: add water and dodecyltrimethylammonium bromide into a rotating high-speed stirring tank in sequence according to the above formula, then add heavy oil and fatty acid, Stir for 60 minutes and discharge.
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The invention discloses a wetting reversal surfactant for drilling fluid. The wetting reversal surfactant is characterized by comprising the following components in percentage by weight: 10 percent of dodecyltrimethylammonium bromide, 15 percent of heavy oil, 20 percent of fatty acid and 55 percent of water. The surfactant does not have influence on the performance of the drilling fluid and has positive charges so as to be mutually absorbed to a hydrophilic rock layer around an oil well with negative charges; the surfactant is adhered to a rock core through a cationic surfactant; the wetting reversal surfactant is covered by a hydrophobic lipophilic group layer; and thus the hydrophilic rock layer is reversed into a lipophilic hydrophobic rock layer to fulfill the aim of replenishing oil and stopping water.
Description
technical field [0001] The present invention relates to a wetting inversion surfactant for drilling fluid. Background technique [0002] As the drilling progresses, the hydrophilic cuttings in the formation continuously invade the oil-based drilling fluid, and the existence of a large amount of hydrophilic substances makes it difficult to control the rheology of the drilling fluid, the fluid loss of the drilling fluid increases, and the demulsification voltage increases significantly. decline. At the same time, during the drilling, completion, production and stimulation of oil wells, water accumulates on the well wall, causing water plugging, which reduces the permeability of crude oil, that is, hinders the flow of crude oil from the formation to the oil well, and reduces the production of the oil well. If the well wall is soaked, it is very easy to cause well wall instability and accidents such as oil well collapse. Contents of the invention [0003] In view of the abov...
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IPC IPC(8): C09K8/03C09K8/584
Inventor 王刚毅何纶
Owner SICHUAN ZHENGRONG IND
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