Low fluorescent film forming filtrate reducer and preparation method thereof

Abstract

The invention relates to a hypofluorescence film forming filtrate reducer and a preparation method thereof, which belong to the technical field of chemical engineering additive for oil drilling. The hypofluorescence film forming filtrate reducer is prepared from cotton cake powder, olefin, 1 percent of aqueous sodium hydroxide solution and span 80. The filtrate reducer has a simple production process, low manufacturing cost, good capacity for high-temperature resistance and salt resistance, hypofluorescence, nontoxicity, small filtration loss amount and good lubricating performance, can meetthe requirement of environmental protection, effectively reduces the dynamic filtration loss amount and dynamic filtration velocity, is favorable for the stability of well wall, improves oil extraction rate of perforation, prevents a drilling fluid and a filtrate from penetrating into a mud shale body, effectively prevents stratum from hydrating, expanding and collapsing, is smooth to pull out and run into holes, prevents blocking and clamping, and solves the problems that the prior filtrate reducer uses mass macromolecular materials, has high price and a complex production process, produces mass substances polluting environment, has poor capacity for resisting high temperature, salt and drill chip contamination and is not favorable for the stability of the well wall. The hypofluorescencefilm forming filtrate reducer can be used for a straight drilling well, an inclined well and a horizontal well.

Description

Technical field: [0001] The invention relates to a low-fluorescence film-forming fluid loss reducer and a preparation method thereof, belonging to the technical field of chemical additives for petroleum drilling. Background technique: [0002] In oil drilling operations, when the drilling fluid flows through the permeable layer under pressure, it will infiltrate, causing the liquid phase of the drilling fluid to seep into the formation. This process is called "water loss". If water loss cannot be well controlled, a large amount of water loss entering the formation will not only induce wellbore instability, but also cause damage to oil and gas formations. At present, the effective way to solve this problem is to add fluid loss control agent in the drilling fluid. [0003] Fluid loss reducer is a chemical additive used in oil drilling. Its main purpose is to seal the fluid between the formations and support the casing to form a solid-free drilling mud system, reduce water los...

AI Technical Summary

Problems solved by technology

Due to the use of a large amount of polymer materials, the fluid loss control agents used in the prior art are not only expensive, the production process is complicated, and a large amount of substances polluting the environment are produced, but also they have poor resistance to high temperature, salt, and cuttings pollution, which is not conducive to well wall Stable, can not meet environmental protection requirements