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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

Inactive Publication Date: 2021-05-28
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The third slug is cement, which is used as a sealing agent to increase the strength of the main slug, accounting for 10-20% of the total injected amount. However, it will gel in the oil layer and reduce the relative permeability of the oil phase.
The continuous phase is cyclohexane, which has high cost, and it will be separated after standing, so the stability is not good, and its salt resistance is only 30000mg / L salinity
[0006] The existing relevant literature and patents have not found a salt-tolerant polymer microsphere plugging agent with ultra-low interfacial tension and its preparation method

Method used

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  • Salt-tolerant polymer microsphere blocking agent and preparation method thereof

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preparation example Construction

[0041] like Figure 9 Shown, a kind of preparation method of salt-tolerant polymer microsphere plugging agent comprises the following steps:

[0042] 1) taking raw materials by weight for subsequent use;

[0043] 2) At room temperature, add white oil, fumed silica, sorbitan fatty acid ester, and hydrophilic surfactant to a container equipped with a stirrer, a thermometer, and a reflux condensing device, and stir evenly. 200~300r / min to make solution A;

[0044] 3) Add the weighed acrylamide monomer, acrylic acid, and N,N-methylenebisacrylamide into water, stir to dissolve them completely, then add sodium hydroxide aqueous solution for neutralization, and the neutralization degree is 50-80%. Then add sodium bisulfite, stir to make it dissolve completely, and make solution B; the mass ratio of solution A to solution B is (1~4):1;

[0045] 4) Add solution B into solution A, emulsify at a stirring speed of 500-600r / min for 20-30min, then raise the temperature to 60-70°C, turn o...

Embodiment 1

[0051] Raw material weight ratio: white oil 40wt%, fumed silica 0.5wt%, acrylamide monomer 20wt%, acrylic acid 5wt%, Span-60 5wt%, N,N-methylenebisacrylamide is 0.03wt%, ammonium persulfate is 0.01wt%, sodium bisulfite is 0.015wt%, Tween-80 is 10wt%, and distilled water is the balance. Put white oil, fumed silica, Span-60, and Tween-80 into a reactor equipped with a stirrer, a reflux condenser, and a thermometer, and stir at a speed of 200r / min to make solution A; Add water to dissolve the amide, then add acrylic acid and N,N-methylenebisacrylamide, stir evenly on a magnetic stirrer, add sodium hydroxide aqueous solution to neutralize after completely dissolving, the neutralization degree is 50%, add sulfurous acid Sodium hydrogen is completely dissolved to prepare solution B, then slowly add solution B to A, and emulsify and stir at a speed of 500r / min for 20min, after emulsification is completed, the temperature is raised to 60°C, and ammonium persulfate is formulated into 1...

Embodiment 2

[0053] Raw material weight ratio: white oil 20wt%, fumed silica 1.1wt%, acrylamide monomer 25wt%, acrylic acid 10wt%, Span-40 10wt%, N,N-methylenebisacrylamide 0.08wt%, ammonium persulfate is 0.05wt%, sodium bisulfite is 0.08wt%, OP-10 is 25wt%, tap water is the balance. Put white oil, fumed silica, Span-40, and OP-10 into a reactor equipped with a stirrer, a reflux condenser, and a thermometer, and stir at a speed of 300r / min to make solution A; Add water to dissolve the amide, then add acrylic acid and N,N-methylenebisacrylamide, stir evenly on a magnetic stirrer, add sodium hydroxide aqueous solution to neutralize after completely dissolving, the neutralization degree is 60%, add sulfurous acid Sodium hydrogen is completely dissolved to prepare solution B, then slowly add solution B to A, and carry out emulsification and stirring at a speed of 600r / min for 25min. The aqueous solution was slowly added in batches, and after the initiator was dripped, the stirring reaction wa...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F222/38C08F2/44C08F2/32C08F2/24C08F2/30C09K8/512C09K8/88
CPCC08F220/56C08F2/44C08F2/32C08F2/24C08F2/30C09K8/512C09K8/887
Inventor 赖小娟冯雪婷王磊王淇韩宁杨莛鋆焦想
Owner SHAANXI UNIV OF SCI & TECH
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