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Temperature-resistant polymer microsphere with double cross-linked structure and preparation method thereof

A double cross-linking and polymer technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor stability of the profile control system and lower recovery effect, and achieve good swelling performance, single The effect of good dispersion and good application prospects

Inactive Publication Date: 2020-12-18
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Description
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  • Application Information

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Problems solved by technology

With the increase of high-temperature and high-salt oil reservoirs in China, the further increase of temperature and salt concentration, the problem of thermal degradation of chemical profile control agents and the problem of viscosity reduction in high-salt environment make the stability of the profile control system worse and improve The recovery effect is reduced

Method used

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  • Temperature-resistant polymer microsphere with double cross-linked structure and preparation method thereof
  • Temperature-resistant polymer microsphere with double cross-linked structure and preparation method thereof
  • Temperature-resistant polymer microsphere with double cross-linked structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] The preparation of the temperature-resistant polymer microsphere of embodiment 1 double crosslinking structure

[0076] (1) Add the emulsifier (Tween60 and Span80, the mass ratio of which is 3.62:8.38) to 10# white oil to obtain the oil phase; put the oil phase in a 250mL three-necked flask in a water bath at 50°C, connect the device, and adjust The stirring speed is 300rpm, and the temperature of the water bath is adjusted to 20°C after 30 minutes;

[0077] (2) Prepare the water phase; weigh the monomers (N-vinylpyrrolidone (NVP), 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and acrylamide (AM)), N,N'- Methylbisacrylamide (MBA) and cross-linking agent 2 (organometallic cross-linking agent or polyethyleneimine (PEI)), dissolved in deionized water, adding potassium persulfate (KPS), stirring until clear, to obtain the water phase ;

[0078] (3) Adjust the stirring speed of the oil phase in step (1), then add the water phase dropwise to the oil phase, stir and emuls...

Embodiment 2

[0080] 1. Selection of stirring speed

[0081] Under the same situation of other reaction conditions (oil-water mass ratio 2:1, emulsifier 10%, monomer 17%, crosslinking agent MBA0.05%, zirconium citrate 1.0%, KPS 0.2%, NaHSO 3 0.2%,), only change the stirring speed of step (3) in the embodiment 1, have selected six different stirring speeds (300,350,400,450,500,550rpm) successively from small to large to prepare heat-resistant polymer microspheres . The relationship between the average particle size of the microspheres prepared in the experiment and the stirring speed is shown in Table 1. As can be seen from the data in Table 1, the average particle diameter of the microspheres significantly decreases with the increase of the mechanical stirring speed. When the stirring speed was 300rpm, the average particle diameter of the microsphere dry powder was 873.2nm, and when the stirring speed was 550rpm, the The average particle size of the dry powder is only 230.3nm. According ...

Embodiment 3

[0108] The characterization of embodiment 3 polymer microspheres

[0109] The microspheres of the three preferred cross-linking systems were characterized. The morphology and molecular structure of the microspheres prepared under the optimal conditions were characterized by infrared spectroscopy, nuclear magnetic resonance spectroscopy and SU8010 scanning electron microscopy. The elemental distribution of the ball was analyzed.

[0110] 1. Zr Microsphere-0.25: The preparation method is the same as in Example 1; the formula is as follows: oil-water ratio 2 / 1, stirring speed 550rpm, emulsifier 10%, monomer 17%, MBA 0.05%, zirconium citrate 0.25%, KPS 0.2 %, NaHSO 3 0.2%.

[0111] 2. Al Microspheres-0.25: The preparation method is the same as in Example 1; the formula is as follows: oil-water ratio 2 / 1, stirring speed 550rpm, emulsifier 10%, monomer 17%, MBA 0.05%, aluminum citrate 0.25%, KPS 0.2 %, NaHSO 3 0.2%.

[0112] 3. PEI Microsphere-0.2: The preparation method is ...

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Abstract

The invention discloses a temperature-resistant polymer microsphere with a double cross-linked structure and a preparation method of the temperature-resistant polymer microsphere, and belongs to the technical field of oilfield chemistry. The temperature-resistant polymer microsphere is prepared from an oil phase, a water phase and an initiator 2, wherein the oil phase is composed of an emulsifierand oil, and the water phase is composed of a monomer, a cross-linking agent 1, a cross-linking agent 2, an initiator 1 and water; the monomers are N-vinylpyrrolidone, 2-acrylamide, 2-methyl propanesulfonic acid and acrylamide; wherein the cross-linking agent 1 is N,N'-methylene bisacrylamide; and the cross-linking agent 2 is an organic metal cross-linking agent and / or polyethyleneimine. The powder of the temperature-resistant polymer microspheres prepared by the method is regular spherical, good in monodispersity and good in swelling property, and a dispersion system can be stable at the temperature of 120 DEG C for more than 50 days. The temperature-resistant polymer microsphere has a good application prospect in deep profile control of high-temperature oil and gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a heat-resistant polymer microsphere with a double crosslinked structure and a preparation method thereof. Background technique [0002] From the end of the 1950s to the 1970s, oil well water plugging was the main profile control water plugging technology in my country. Oilfields mainly used water plugging in production wells, using water glass, cement, resin, etc. as the main plugging agents. In the early 1980s, oilfields mainly used cross-linked polymer gel to adjust the near-well water absorption profile and industrial profile. The profile control agent for water injection well profile control and water shutoff technology was mainly high-strength gel, and the role of high-strength gel in profile control and water shutoff The idea is to achieve the purpose of blocking through physical blocking. At the end of the 1980s, oil development workers first proposed to injec...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F226/10C08F222/38C08F2/32C08J3/24C08L33/26C08L79/02C08K5/098C09K8/512
CPCC08F2/32C08F220/56C08J3/24C08J3/246C08J2333/26C08J2479/02C08K5/098C09K8/5083C09K8/512C08F220/585C08F226/10C08F222/385
Inventor 林梅钦向煜琪杨子浩张娟吕其超
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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