Liquid plugging agent and preparation method thereof

Abstract

The invention discloses a liquid plugging agent and a preparation method thereof. The preparation method comprises the following steps: 1, preparing colloidal particles: dissolving 5-10g of an activating agent into 10-30g of water to obtain an activating agent solution, adding the activating agent solution into 2-8g of latex, and stirring until the liquid is clear to obtain cured colloidal particles; 2, emulsifying colloidal particles: dissolving 5-10g of a terminating agent into 20-50g of water, adding the cured colloidal particles into a terminating agent solution, and emulsifying a mixed solution of the colloidal particles and the terminating agent to obtain an emulsion; and 3, preparing the liquid plugging agent: dissolving 10-15g of a stabilizer in 40-60g of water, adding the prepared stabilizer solution into the emulsion prepared in the step 2, and emulsifying by using an emulsifier to obtain a final liquid plugging agent. The prepared emulsion type plugging agent with responsiveness to the pressure difference can form a tough coupling object at the position of the pressure difference, the remaining plugging agent is still kept in a liquid state, good flowability is kept, the adaptive capacity to complex underground conditions is improved, and the construction risk is low.

Description

technical field [0001] The invention belongs to the field of oil field exploration and development. Specifically relates to a liquid blocking agent and a preparation method. Background technique [0002] Some oilfields have the typical characteristics of low pressure, low permeability, and low production. When the oil well was first put into production, it was put into production by conventional sanding fracturing. The sanding fracture was an important seepage channel near the well. Crude oil has been basically produced, but due to low permeability and low formation pressure, it is difficult to recover crude oil from lateral fractures. The remaining oil is enriched in the lateral direction of the original fractures, forming a batch of low-yield, low-efficiency, and low-recovery oil wells, which seriously affects the development benefits of the oilfield. Repeated stimulation of old wells has become an important means of treating low-yield and low-efficiency wells. Conventio...

AI Technical Summary

Problems solved by technology

The remaining oil is enriched in the lateral direction of the original fractures, forming a group of low-yield, low-efficiency, and low-production oil wells, which seriously affects the development benefits of the oilfield

Repeated stimulation of old wells has become an important means of treating low-yield and low-efficiency wells. Conventional refracturing technology has long extension of fractures, which makes it easy to communicate with the water injection front, but has a high risk of water breakthrough. It is difficult to realize lateral remaining oil production. Plugging fracturing has gradually become the main means of repeated reconstruction because it can inhibit the extension of fracture length and increase the net pressure inside the seal. However, there are still some problems in temporary plugging fracturing, such as unsatisfactory temporary plugging effect, difficult control of temporary plugging pressure increase, and high construction risk.