A kind of self-foaming foam drainage agent and preparation method thereof

Abstract

The invention discloses a self-foaming-type foaming drainage agent. The self-foaming-type foaming drainage agent comprises, by weight, 20-40 parts of soapberry fruit saponin, 8-25 parts of sodium fatty acid methyl ester sulfonate, 8-25 parts of 1-hydroxyethylidene-1,1-diphosphonicacid, 10-30 parts of sodium bicarbonate and 10-30 parts of tartrate. The preparation method comprises the following steps of S1, weighing: weighing the raw materials according to the above ratio for next use, S2, drying: drying the weighed raw materials so that water content is less than 3%, and S3, pressing: adding all the dried raw materials into a mixer, carrying out stirring for 4-8min, transferring the mixture into a hydraulic press and carrying out processing to obtain round rod-shaped solids which are the self-foaming-type foaming drainage agents. The self-foaming-type foaming drainage agent realizes natural gas well foaming drainage of a water-blocked gas well or a natural gas well with a weak stratum capability, has dual effects of gaslifting and a foaming drainage agent, has a strong self-foaming capacity and a high liquid carrying rate and can produce effects fast. The preparation method has simple and convenient processes, has a low production cost, is environmentally friendly and is suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a self-foaming foam drainage agent used in the foam drainage revival process of water-flooded gas wells and a preparation method thereof. Background technique [0002] In the middle and later stages of natural gas well production, due to the decline in the energy of the gas well itself, the formation water also enters the wellbore along with the natural gas and accumulates at the bottom of the well or near the wellbore, resulting in a decline in the gas production of the gas well. After a while it is drowned in water and cannot be mined. [0003] At present, in order to solve the problem that the production of gas wells is affected by formation water, the method adopted is to inject foaming agent, or put foam rods or foam balls through the tubing to foam the bottom fluid so as to utilize the lower natural gas flow rate. It can remove the effusion and preve...

AI Technical Summary

Problems solved by technology

However, using gas to lift trucks or borrowing natural gas from high-pressure gas wells will cost a lot to revive a well and take a long time, ranging from tens of thousands to hundreds of thousands

Moreover, after a period of production, the revived gas well is easily drowned if the fluid in the wellbore is not discharged in time

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