Foaming material for gas field foam discharging agent, slow dissolving foam discharging agent, and preparation method of slow dissolving foam discharging agent

Abstract

The invention discloses a foaming material for a gas field foam discharging agent, a slow dissolving foam discharging agent, and a preparation method of the slow dissolving foam discharging agent, and belongs to the technical field of the oilfield chemistry. The foaming material comprises, by weight, 1 part of Sapindus mukurossi Gaertn extract, 0.03-0.1 parts of fatty alcohol polyoxyethylene ether AEO18 and 0.01-0.1 parts of lauric diethanolamide. The foaming material can be obtained by compounding the above three components, can mutually enhance surface active substances in the foaming material, improves the stability and environmental disturbance resistance of foams, improves the biodegradability of a surfactant, and reduces the toxicity of the foam discharging agent and the pollution of the foam discharging agent to the environment. PVA and an enteric acrylic resin are added as dressing materials, so the dissolving rate of the foaming material in water can be effectively controlled, thereby the foam discharging agent obtained by using the foaming agent is slowly dissolved in water, has a strong salinity resistance and a strong condensate oil resistance, has a very strong secondary foaming ability, has good compatibility with drugs comprising methanol, a corrosion inhibitor, a scale inhibitor and the like, and does not chemically react with gas or liquid components.

Description

technical field [0001] The invention specifically relates to a foaming material for a gas field foaming agent, a slow-dissolving foaming agent using the foaming material and a preparation method thereof, and belongs to the technical field of oilfield chemistry. Background technique [0002] The formation water produced during the exploitation of gas fields will affect the production of natural gas to varying degrees. In order to help gas wells discharge formation produced water, people have used drainage technologies such as foam drainage, plunger gas lift drainage, ultrasonic atomization drainage, gas lift drainage, split plunger drainage, rod pump drainage, rodless pump drainage, etc. . Foam drainage gas recovery technology has the advantages of simple equipment, easy construction, quick results, low cost, less gas well energy loss, and no impact on gas well production, and has been widely used in gas production at home and abroad. [0003] At present, many domestic manu...

AI Technical Summary

Problems solved by technology

However, for some horizontal wells, the string structure is complex, there are multiple packers in the well, and they cannot be unsealed, resulting in disconnection of the oil casing of the gas well. In order to ensure that the agent can fully flow down, the well needs to be shut down. When the well is shut down, the fluid in the upper part of the tubing will fall back to the bottom of the well. Therefore, in order to make the agent mix with the bottomhole fluid, the well must be shut in for a long enough time. The field test should be at least 6 hours. This not only affects the production rate of the gas well, but also makes it difficult to start the bubble drainage due to the large amount of fluid flowing back to the horizontal section, and the foam drainage effect is poor

Secondly, the horizontal well is a highly deviated well, and the build-up section is long, and the foam is easily broken in the build-up section, which affects the foam discharge effect. At the same time, when the rods are cast, the foam discharge rods can only reach the build-up section and cannot enter the horizontal section. Affect the throwing effect, resulting in poor bubble discharge effect

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