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A drainage aid for fracturing and acidizing
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A technology of fracturing acidification and drainage aids, which is applied in chemical instruments and methods, wellbore/well components, production fluids, etc., and can solve the problem of affecting the flowback efficiency, the large demand for acidified fracturing fluid, and the reduction of crude oil output And other issues
Active Publication Date: 2019-09-20
成都百联油田技术服务有限公司
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However, the problems in the acidified fracturing fluid drainage aid provided by this patent are: (1) the drainage aid uses a quaternary ammonium salt, but does not use a cosolvent. Considering that the rock surface is usually negatively charged, cationic surfactants are prone to The wetting reversal of the rocks hinders the smooth outflow of crude oil. Although the quaternary ammonium salt improves the reverse discharge efficiency to a certain extent, the residual quaternary ammonium salt will greatly reduce the crude oil output during the production process; (2) Alkylphenol polycarbonate Oxyethylene ether is a non-ionic surfactant, which is very stable to acids, bases and oxidants, not easily hydrolyzed, and has good surface activity, but the concentration of its metabolites is far below the minimum limit of acute toxicity of aquatic organisms. In the mid-1980s Some countries have started advocating in favor of restricting or banning the use of these surfactants
[0007] (1) The drainage aid for fracturing acidification of the present invention is a multi-component additive. When it is mixed with the acidified fracturing fluid in advance, the overall volume of the acidified fracturing fluid is large and the viscosity is very high, so it cannot be well The realization of the mixing between the drainage aid and the acidified fracturing fluid, especially the complete mixing of the drainage aid components can not be achieved at all, which greatly affects the drainage efficiency
[0008] (2) Due to the large demand for acidified fracturing fluid, intermittent dosing (mixing the multi-component drainage aid in a separate device in advance and then adding it to the acidified fracturing fluid for mixing) requires a large number of acid storage tanks , the cost of fracturing equipment is high, and the labor intensity of on-site staff is high
[0009] (3) Adding the components of the drainage aid directly into the acidified fracturing fluid with high-intensity stirring and mixing will accelerate the degradation of the polymer additive, and it is difficult to achieve complete mixing between the components of the drainage aid. Effect of cracking and acidizing operation
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Embodiment 2
[0059] This embodiment is a further improvement on Embodiment 1, and repeated content will not be repeated here.
[0060] This example illustrates the mass ratio of the drainage aid for fracturing and acidification and the effect of the drainage aid.
[0061] According to a preferred embodiment, the additional surfactant is a fluorocarbon surfactant, and the fluorocarbon surfactant is anionic fluorocarbon surfactant, cationic fluorocarbon surfactant, zwitterionic fluorocarbon surfactant and any one or more of nonionic fluorocarbon surfactants. The drainage aid of the present invention can effectively fuse and synergize additives such as fluorocarbon surfactants and cationic gemini surfactants, so that the drainage aid has lower surface tension, lower interfacial tension and better Anti-swelling ability, the demulsification and drainage aid is used in the fracturing and acidizing treatment of oilfield reservoirs, which can effectively inhibit the expansion of clay, reduce the ...
example 1
[0071] Example 1: The drainage aid is composed of the following raw materials: 35% of heptamethyltrisiloxane, 10% of monoterpene, 15% of polyoxyethylene lauryl ether, and 40% of water.
[0072] Experiments were carried out on the performance of the obtained nanoemulsion aid drainage agent to promote the flowback of fracturing fluid:
example 2
[0075] Example 2: The drainage aid is composed of the following raw materials: 40% of heptamethyltrisiloxane, 10% of monoterpene, 10% of polyoxyethylene lauryl ether, and 40% of water.
[0076] Experiments were carried out on the performance of the obtained nanoemulsion aid drainage agent to promote the flowback of fracturing fluid:
[0077] Comparative example: fill 40-60 mesh quartz sand into a sand filling tube with a length of 35cm and a diameter of 2.5cm, vibrate up and down 300 times to keep the permeability basically consistent each time, inject 30mL of water into the sand filling tube, and open the lower valve , so that the liquid flows out under the action of gravity, the outflow liquid volume is 7.8mL, and the drainage efficiency (that is, the ratio of the outflowed water volume to the original injected water volume) is 26%.
[0078] Experimental example: Fill 40-60 mesh quartz sand into a sand filling tube with a length of 35cm and a diameter of 2.5cm, vibrate up an...
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Abstract
The invention relates to a discharge aiding method of a discharge aiding agent for fracture acidizing. The discharge aiding method includes the following steps that all components of the discharge aiding agent are mixed and injected into an oil gas well in a time-sharing and asynchronous mode through a mixing device at least provided with an input unit, an injection unit and a control unit; and according to the control information of the control unit, the input unit inputs the components into the injection unit in a time-sharing mode and in a pressurizing mode through designated input pipelines matched with the flow characteristic parameters of the control information. The injection unit comprises a mixing hole channel provided with a first mixer, a second mixer and a third mixer, and at least one input hole formed in the hole wall. Base on the control information which is relevant to time and generated by analysis of the flow characteristic parameters of the components and the component proportion of the discharge aiding agent through the control unit, the injection unit injects the components into the oil gas well according to the designated spraying rate and the designated spraying time of the components injected in a time-sharing mode and / or the designated rate ratio between at least two kinds of components injected simultaneously. According to the discharge aiding method of the discharge aiding agent for the fracture acidizing, the discharge aiding effect is improved obviously.
Description
technical field [0001] The invention relates to the field of drainage aids for fracturing acidification, in particular to a drainage aid method for drainage aids for fracturing acidification. Background technique [0002] For the acid fracturing process, it is a huge challenge to achieve the optimal theoretical flowback rate of the drainage aid at the construction site. The technical difficulty lies in how to improve the mixing degree of the drainage aid, the acidified fracturing fluid and various other additives that need to be added, without affecting the overall stability of the acidified fracturing fluid. Compared with the laboratory, time and cost are the most important factors in the construction site. How to get the best mixing effect in the least time and cost is a problem worth studying. [0003] The fracturing and acidizing process is an important measure for the transformation of low-permeability and ultra-low-permeability oil and gas reservoirs, and a leading te...
Claims
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Application Information
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