Composition for solid precipitation and inhibition of oil and gas well

Abstract

The invention discloses a composition for solid precipitation and inhibition of an oil and gas well. The composition for solid precipitation and inhibition per 100 parts by weight is prepared from the following components: 0.08 to 0.13 part by weight of ferrocyanide, 0.005 to 0.02 part by weight of a polyether type surfactant, 0.005 to 0.02 part by weight of a hydrophobic modified cationic polymer and the balance of water. The composition can be put in the oil and gas well with hypersalinity; the ferrocyanide can be used for changing the charge distribution on the surface of metal cations, and the hydrophobic modified cationic polymer can be used for adsorbing anions in hydrops of the oil and gas well, so that the metal cations such as sodium ions can be prevented from being combined with the anions to form inorganic salts so as to be separated out from the hydrops of the oil and gas well, and the inhibition rate is 90 percent or more; the polyether type surfactant can be directionally adsorbed on the surface of hydrocarbon organisms such as paraffin, a polar surface can be formed, non-polar hydrocarbon organisms such as paraffin crystal can be prevented from being continuous crystallized and separated out, and the inhibition rate is 53 percent or more; the ferrocyanide, the hydrophobic modified cationic polymer and the polyether type surfactant can promote each other and are capable of commonly inhibiting the inorganic salts and the hydrocarbon organisms such as the paraffin from being separated out.

Description

technical field [0001] The composition for inhibiting solid phase deposition of oil and gas wells according to the present invention. Background technique [0002] There are many large saline basins rich in oil and gas resources in my country, such as Bohai Bay Basin, Sichuan Basin, Jianghan Basin, and Tarim Basin. The Qianjiang sag in the center of the Jianghan Basin is a unique inland high-salinity sodium chloride salt lake deposit in my country. The extremely thick salt rock layer and salt structures such as salt domes, salt anticlines, and salt noses in the sag play an important role in the formation of oil and gas fields. obvious control effect. Oil and gas fields in saline basins generally have formation water with high salinity. For example, the formation water salinity of Tertiary oilfields in the western Qaidam Basin reaches 190-350g / L, and the formation water salinity of Wenzhong block oilfields in Zhongyuan Oilfield reaches as high as 300g / L. ~350g / L, the oilfiel...

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Problems solved by technology

And these solid phase deposits often accumulate in the well wall, the pipe wall of the lift pipe, the oil pump and the ground manifold system for crude oil collection and treatment, which often cause pump jams and oil pipe blockage, requiring frequent pump inspection operations, and even oil and gas overhaul At the same time, the formation will be blocked, resulting in a decrease in the permeability of the formation near the wellbore, and even causing oil and gas wells to fail to produce oil and gas in severe cases

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