Micro-suspension self-selection water shutoff and profile control agent and application method thereof

Abstract

A micro-suspension self-selection water shutoff and profile control agent. A layer self-selection water shutoff and profile control agent applied to oil deposit with middle and high water content can carry out self-selection water shutoff and profile control in a layer of complex oil deposit with middle and high water content, a lateral well and a secondary big pore channel. The water shutoff and profile control agent comprises 5-50% of asphalt, 1-5% of olefin, 0.5-1.0% of octadearyl dimethyl ammonium chloride, 0.1-0.15% of carboxymethyl cellulose sodium, 5-15% of stable control agent sodium hydroxide aqueous solution and the balance of water. The preparation method comprises step of processing the raw materials into stable micro fluid suspension with a particle size of 1 mum-1mm through machinery crushing and grinding by a colloid mill. The invention has the following beneficial effects: the water shutoff and profile control agent can be applied to layer self-selection water shutoff and profile control of oil deposit with high water content; a main agent asphalt can be dissolved in light oil completely but not in water; plastic colloid can be precipitated; and blocking of different strength can be realized through reasonable selection and assembly of softening points of the main agent.

Description

technical field [0001] The invention relates to the technical field of oilfield development, and provides a self-selective plugging adjustment based on asphalt and paraffin as main materials and an application method, which can be used for selective water plugging in layers. Background technique [0002] At present, oil well water plugging and profile control technology has always been an effective means for oilfields to improve the effect of water injection development and achieve stable production of oil reservoirs. There are two main categories of existing self-selective plugging technologies. [0003] One type is polymer hydrogel, which is characterized by relying on viscous resistance to control the water flow velocity, and has a certain degree of expansion in water and a certain degree of shrinkage in oil, so it has certain selectivity, but the plugging strength is low; [0004] One is emulsified heavy oil and modified asphalt, which are characterized by oil solubilit...

AI Technical Summary

Problems solved by technology

Emulsified heavy oil to change the wetting phase on the rock surface and Jamin effect to play a water blocking role, with strong selectivity and low strength; modified asphalt relies on loose accumulation, mainly mechanical plugging, which limits selectivity

[0005] After the oilfield enters high water-cut or ultra-high water-cut production, the original heterogeneity of the reservoir and the long-term water drive heterogeneity are further intensified, and high-permeability channels or large pores are gradually formed in the oil layer, which makes the formation pressure field and streamline field form a fixed pattern. , the water flow dominant channel is formed between the oil and water wells, resulting in a "short circuit" of water flooding. The existing plugging and adjusting technology cannot well satisfy the complex oil-water movement relationship, especially for the plugging of the horizontal well development that can realize the self-selective regulation of the water production channel in the layer. Adjustment and application technology are immature