Spherical solid foam scrubbing agent for natural gas fluctuation horizontal well

Abstract

The invention relates to a spherical solid foam scrubbing agent for a natural gas fluctuation horizontal well in gas field foam drainage gas recovery production. Lifting can be automatically controlled at a horizontal extension section of a horizontal well to improve the drainage gas recovery effect of the horizontal well. According to the technical scheme, the spherical solid foam scrubbing agent is a multi-layer concentric sphere and is prepared from 25-45% of sodium dodecyl sulfate, 10-35% of fatty alcohol-polyoxyethylene ether, 10-25% of acrylic resin, 0-40% of sodium bicarbonate and 5-10% of urea. The spherical solid foam scrubbing agent is composed of multiple foam scrubbing spheres, and foam scrubbing agents with different formulas and densities are adopted for manufacturing 3-9 layers to form a concentric sphere which is pressed and toasted to be dry to form the spherical solid foam scrubbing agent; the foam scrubbing agent is placed into the horizontal well, sunk and dissolved and ascends to the extension section of the whole horizontal well, and foam drainage gas recovery is achieved. By means of the spherical solid foam scrubbing agent, the drainage efficiency of the horizontal well is improved, accumulated liquid can be smoothly drained, and use is convenient, easy and economical.

Description

technical field [0001] The invention relates to a spherical solid foaming agent for undulating horizontal wells of natural gas, in particular to the field of foam drainage and gas recovery production in gas fields. The spherical solid foaming agent can automatically control the lifting in the undulating horizontal well section. Background technique [0002] As the development of the gas field enters the middle and late stages, the flow rate of natural gas in the gas layer will gradually decrease, more and more water will be produced, and the gas-water ratio will become smaller and smaller. At that time, the water in the gas layer will accumulate at the bottom of the well, which will suppress the pressure at the bottom of the well and seriously affect the production of the gas well. Foam drainage gas recovery is the most widely used and effective method to effectively discharge the bottom well fluid. [0003] At present, domestic and foreign drainage gas recovery techniques ...

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Problems solved by technology

For example, Chinese patent 201310402751.1 discloses "foam volleyball for gas wells and its preparation method", the application number is 200620033796.1, and the Chinese patent "A Hollow Solid Drainage Aid" uses a solid downhole throwing method for injecting the foaming agent. Chinese patent 201420202087.6 The disclosed method and technology of "Natural Gas Well Foaming Agent Intelligent Delivery Device" is widely used in vertical wells, but not applicable to horizontal wells, because the traditional dosing process can only put medicines at the starting point of the horizontal extension section of horizontal wells But it is impossible to make the foaming agent can be put into the end of the horizontal extension section of the horizontal well

Application No. 201210047727.6 of the Chinese patent "A Method for Foam Drainage Gas Recovery in Horizontal Gas Wells of Natural Gas" is used in horizontal well drainage and gas recovery, but it cannot be applied to undulating horizontal well sections. Therefore, foam drainage in undulating horizontal wells In the gas, the blowing agent can be put into the end of the horizontal extension section to generate foam in the entire horizontal wellbore, which is of great significance to the effect of horizontal well drainage and gas recovery

[0004] According to literature research, there is no report on the idea, product, process design method and theoretical basis of a spherical solid foam drainage agent used in undulating horizontal wells in terms of drainage and gas recovery technology using spherical solid foam drainage agents.

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