Preparation and properties of terpolymeric microspheres for deep profile control in oilfields

Zr-Induced high temperature resistance of polymer microsphere based on double crosslinked structure

“…As an important oil displacement agent in the deep prole control technique of the tertiary recovery phase, polyacrylamide (PAM) microspheres are very effective in increasing and stabilizing crude oil production. 1,2 Because of their exible particle size, good swelling properties, excellent elasticity and good injection properties, PAM microspheres can migrate deep into the reservoir and achieve deep prole control. 3 Though these attractive characteristics could lead to the use of PAM microspheres in the tertiary recovery phase, the enormous challenges of good swelling properties and long-term high temperature performance still remain for the development of advanced prole control and water shutoff materials, including injectable polymer microspheres.…”

Preparation of rosin-based polymer microspheres as a stationary phase in high-performance liquid chromatography to separate polycyclic aromatic hydrocarbons and alkaloids

“…(2) All of the five PAHs can enter into the hole interior of polymers; otherwise, the relationship shows an fold line (19). (3) When the sample enters the hole interior, the mass transfer resistance of the molecules changes according to molecular weights. The diffusion rate quickens when the molecular weight decreases (20).…”

“…The literature contains many examples of self-dual Leonard pairs. For instance (i) ated with an irreducible module for the Terwilliger algebra of the hypercube (see [4, C Leonard pair of Krawtchouk type (see [10, De nition 6.1]); (iii) the Leonard pair assoc module for the Terwilliger algebra of a distance-regular graph that has a spin model i bra (see [1,Theorem], [3,Theorems 4.1, 5.5]); (iv) an appropriately normalized totall (see [11,Lemma 14.8]); (v) the Leonard pair consisting of any two of a modular Leona De nition 1.4]); (vi) the Leonard pair consisting of a pair of opposite generators for bra, acting on an evaluation module (see [5,Proposition 9.2]). The example (i) is a sp examples (iii), (iv) are special cases of (v).…”

“…Polymer microspheres are polymeric materials or polymer composites with sizes ranging from nanometer to micrometer scale and spherical geometrical shapes (1)(2)(3). Polymer microspheres have wide applications in stationary phases, biological medicine and many other fields (4-7).…”

Intelligent sustained‐release microgel for reduced permeability of fluid channels: Synthesis and properties

“…3,4 Profile control agents have been applied in oilfields, including in-situ polymer gels, [5][6][7] particle gels 8,9 and polymer microspheres. 10,11 Microspheres have been successfully used as a deep fluid flow agent with excellent performances, 12 due to their nanometer sizes, good injection properties, and deep migration capabilities. 13,14 Moreover, microspheres have excellent dimensional and thermal stability when used as a pre-crosslinking system.…”