Polymer microsphere modifying and flooding agent for high-temperature and high-salinity oil reservoir as well as preparation method and application thereof

A technology of high temperature and high salt, adjusting flooding agent, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of environmental pollution, complex preparation process, fast gel forming speed, etc., to improve viscosity and salt resistance Temperature capability, simple preparation process, and the effect of increasing regularity

Inactive Publication Date: 2020-03-27
成都新驱势石油技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this kind of gel particles is still prepared by using acrylamide or acrylic acid as a monomer, it is still seriously affected by factors such as temperature, salinity, and formation shear, and the preparation process is complicated and difficult to control.
[0004] CN 102127410A discloses a slow-swelling pre-crosslinked gel body swelling granule and its preparation method. It is formulated with speed control agent, performance modifier, water, etc. However, when the cross-linking agent is chromium cross-linked or phenolic resin cross-linked, the gelling speed is fast, the applicable temperature of the oil reservoir does not exceed 80 ℃, and the salinity resistance No more than 10,000 mg / L. When plugging formation fractures or large pores, the concentration of the agent is high and the cost is high. Because the raw materials are highly toxic to the human body and seriously pollute the environment, the scope of application is narrow, which is not conducive to large-scale oil fields. Promote application

Method used

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  • Polymer microsphere modifying and flooding agent for high-temperature and high-salinity oil reservoir as well as preparation method and application thereof
  • Polymer microsphere modifying and flooding agent for high-temperature and high-salinity oil reservoir as well as preparation method and application thereof
  • Polymer microsphere modifying and flooding agent for high-temperature and high-salinity oil reservoir as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The high-temperature and high-salt oil reservoir polymer microspheres in this example are prepared through the following steps:

[0033] S1. Dissolve 2g Span-80 and 0.5g diallyl phthalate in 40g kerosene solvent, heat to 40°C, pass N 2 Deoxidize for 10 minutes, and prepare an oil phase solution;

[0034] S2. Dissolve 2g of acrylamide, 0.2g of vinylpyrrolidone and 0.4g of OP-10 in 100mL of deoxygenated distilled water, then neutralize with NaOH solution to pH 8, pass N 2 Deoxidize for 10 minutes, and prepare an aqueous solution;

[0035] S3. Under the condition that the stirring speed is 300r / min, take 30% of the aqueous phase solution prepared in S2 and drop it into the oil phase solution at a speed of 0.5ml / s, then add 0.1g azobisisobutyronitrile and 4g 2-Acrylamido-2-methylpropanesulfonic acid sodium salt was stirred for 30 minutes, and while the stirring speed was kept constant, the remaining aqueous phase was added to it at a speed of 3ml / s, and the temperature wa...

Embodiment 2

[0038] The high-temperature and high-salt oil reservoir polymer microspheres in this example are prepared through the following steps:

[0039] S1. Dissolve 4g of Span60 and 3g of diallyl fumarate in 50g of cyclohexane solvent, heat to 45°C, pass N2 to remove oxygen for 10min, and prepare an oil phase solution;

[0040] S2. Dissolve 5g of acrylic acid, 1g of 2-acetamidostyrene and 0.8g of Tween-60 in 100mL of deoxygenated distilled water, then neutralize it with NaOH solution until the pH is 9, pass N2 to deoxygenate for 10min, and prepare an aqueous phase solution;

[0041] S3. Adjust the stirring to 800r / min, drop 30% of the water phase solution into the oil phase solution at a rate of 1ml / s and mix, then add 0.3g of azobisisoheptanonitrile and 10g of ethylene glycol dimethacrylate Stir the ester for 30 minutes. While maintaining the constant stirring speed, add the remaining aqueous solution at a rate of 2ml / s, and raise the temperature to 70°C at the same time, and react f...

Embodiment 3

[0044] The high-temperature and high-salt oil reservoir polymer microspheres in this example are prepared through the following steps:

[0045] S1. Dissolve 3g Span60 and 2g diallyl methacrylate in 45g petroleum ether solvent, heat to 45°C, pass N 2 Deoxidize for 10 minutes, and prepare an oil phase solution;

[0046] S2. Dissolve 3g of methacrylamide, 0.6g of 3-acetamido-4-vinylpyridine and 0.6g of OP-10 in 100mL of deoxygenated distilled water, then neutralize with NaOH solution to pH 8, pass N 2 Deoxidize for 10 minutes, and prepare an aqueous solution;

[0047] S3. Adjust the stirring to 600r / min, drop 30% of the water phase solution into the oil phase solution at a rate of 1.5ml / s and mix, then add 0.2g of azobisisobutyronitrile and 8g of trimethylpropanetriacrylate The methyl ester was stirred for 30 minutes, and while the stirring speed was kept constant, the remaining aqueous solution phase was added into it at a rate of 4ml / s, and the temperature was raised to 70°C at...

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Abstract

The invention discloses a polymer microsphere modifying and flooding agent for a high-temperature and high-salinity oil reservoir as well as a preparation method and application of the polymer microsphere modifying and flooding agent. The modifying and flooding agent is prepared from an oil-soluble emulsifier, an oil-soluble unsaturated diene monomer, an acrylamide monomer, an aromatic ring-containing olefin monomer, a water-soluble emulsifier, an oil-soluble initiator, a cross-linking agent, water and an oily solvent through water-in-oil-in-water double emulsion polymerization. The polymer microsphere profile modifying and flooding agent prepared by the invention is not easy to degrade in a medium with high mineralization degree, molecules of the modifying and flooding agent do not contain groups easy to hydrolyze, so that the rigidity of a polymer molecular chain is increased, the tackifying, salt resistance and temperature resistance of a polymer are improved, and meanwhile, the polymer microsphere modifying and flooding agent is relatively high in breakthrough pressure gradient, relatively strong in expansibility and relatively good in plugging performance; the preparation process is simple, and drying and granulation processes after the conventional polymer microsphere modifying and flooding agent is prepared are omitted.

Description

technical field [0001] The invention belongs to the field of water well deep control and displacement, and in particular relates to a polymer microsphere control and displacement agent for high-temperature and high-salt oil reservoirs, a preparation method and application thereof. Background technique [0002] At present, there are two types of deep liquid flow diversion profile control agents, one is gel type, and the other is particle type. Under formation conditions, gel-type profile control agents are prone to non-crosslinking and formation due to the influence of various factors such as on-site preparation, shearing, degradation, salinity, temperature, water quality, formation adsorption and dissolution of crosslinking agents, etc. The gel condition is poor, or the stability of gel formation is poor, and the granular deep profile control agent has poor temperature and salt resistance, low shear resistance, and is easy to break under high pressure. Neither is ideal. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/516C09K8/512C09K8/588
CPCC09K8/5083C09K8/512C09K8/516C09K8/588
Inventor 罗东辉金发扬赵金姝
Owner 成都新驱势石油技术开发有限公司
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