Foaming agent for highly mineralized water containing barium-strontium ions and gas condensate and preparation method thereof

Abstract

The invention discloses a foaming agent for highly mineralized water containing barium-strontium ions and gas condensate and a preparation method thereof. The foaming agent contains the following components in mass percentage: 40%-50% of amphoteric surfactants, 10%-20% of nonionic surfactants, 5%-10% of barium-strontium ion inhibitors, 3%-5% of pH regulators and 15%-42% of solvents. The preparation method comprises the following steps of: A, adding the amphoteric surfactants and the nonionic surfactants into a stainless steel reactor by the proportions in a formula, heating to 50-60 DEG C, and then stirring for 20 min-50 min; B, adding the solvents and stirring for 20 min-30 min; and C, finally adding the barium-strontium ion inhibitors and the pH regulators, and continuously stirring for20 min-30 min. The foaming agent can have good foaming performance and liquid-carrying capacity in a formation water medium which contains 1000 mg / L-3000 mg / L of barium-strontium ions and has the gascondensate of not more than 30% and the total mineralization degree of not more than 250 g / L. In experiments, when the addition amount of the foaming agent is 3 g / L, the foaming height is greater than 150 mm, and the liquid-carrying amount is greater than 150 ml / 15 min.

Description

technical field [0001] The invention relates to the technical field of natural gas well exploitation, in particular to a foaming agent for high salinity water containing barium and strontium ions and condensate oil and a preparation method thereof. technical background [0002] During the production of gas reservoirs with water, with the production of natural gas, formation water with high salinity and condensate oil containing various ions continuously enters the wellbore along with the natural gas. If the gas has enough energy, it can absorb the The liquid is brought to the surface, and there is no effusion at the bottom of the well. In the middle and late stage of natural gas exploitation, the formation water is becoming more and more serious, and the formation energy is also seriously insufficient, so the gas cannot completely bring water and condensate oil to the ground. If it is not discharged in time, the gas well will be flooded due to the deposition in the downhole...

AI Technical Summary

Problems solved by technology

[0004] At present, the foam drainage gas recovery process is mostly used in the production of water-filled gas reservoirs in China. Although these foaming agents have achieved certain results in field application, they have the following shortcomings: (1) Due to the current impact of these foaming agents on barium-strontium-containing The medium with high salinity of ions is not highly targeted, and the foaming agent and barium and strontium ions form insoluble precipitates, which cause fouling or blockage of the tubing

(2) The foaming agent has poor ability to resist condensate oil, and oil-water emulsification occurs with condensate oil. On the one hand, the performance of the foaming agent is reduced, and the emulsion may block the oil pipe

Images