Salt-tolerant polymer microsphere blocking agent and preparation method thereof

A technology of polymer and plugging agent, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., and can solve problems such as high cost, poor stability, and reduced oil phase relative permeability
CN112851856AInactive Publication Date: 2021-05-28SHAANXI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHAANXI UNIV OF SCI & TECH
Publication Date
2021-05-28
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a salt-resistant polymer microsphere plugging agent and a preparation method thereof. The polymer microsphere plugging agent is prepared from the following raw materials: white oil, fumed silica, an acrylamide monomer, acrylic acid, sorbitan fatty acid ester, N,N-methylene bisacrylamide, ammonium persulfate, sodium hydrogen sulfite, a hydrophilic group surfactant, water and the like. The salt-tolerant polymer microspheres with ultralow interfacial tension are synthesized by adopting an inverse emulsion polymerization method, a prepared polymer microsphere plugging agent is novel polymer microspheres with ultralow interfacial tension, the interfacial tension can reach 4.3*10 <-3> mN / m, the salt tolerance can reach 50000 mg / L of mineralization degree, and the problems that existing polymer microspheres are low in interfacial tension and poor in salt tolerance are solved.
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Description

technical field

[0001] The invention belongs to the technical field of oil field exploitation chemicals, in particular to a salt-resistant polymer microsphere plugging agent with ultra-low interfacial tension and a preparation method thereof. Background technique

[0002] Polyacrylamide microspheres are a class of widely used water-absorbing resins, which are used in deep profile control and water plugging in oilfields, mainly for deep profile control in oilfields with strong heterogeneity, high water content, and large pores. New technology developed for the effect.

[0003] In the prior art, Chinese patent CN1888374A discloses a high-temperature and high-salt water blocking method, which adopts three-segment injection water blocking method, and the first slug is added with a plugging agent, accounting for 10-20% of the total injected amount; After 0.5-1.5 hours of plugging agent injection, shut down the well and wait for solidification, causing the plugging agent to gel a...

Claims

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