Dissoluble polymeric microsphere deep profile modifying and flooding agent and preparation method thereof

A technology for adjusting the displacement agent and polymer, which is applied in the field of deep displacement adjusting agent for decomposable polymer microspheres, can solve the problems of limited promotion and use, harsh application conditions, poor temperature and salt resistance, and achieves simple construction process and initial performance. Low viscosity, easy injection effect

Inactive Publication Date: 2015-08-12
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that colloidal disperse gel (CDG), a single-fluid control and displacement agent, has the potential of deep control and displacement (Guo Zhidong et al., Research on Oil Displacement Characteristics of CDG and Polymer, Oilfield Chemistry, 2009, 26(1): 84- 90); but because of its harsh application conditions and poor temperature and salt resistance, its domestic promotion and use is limited
In recent years, polymer microspheres have been proved to be a new type of material due to their environmental protection, controllable size, high strength, easy elastic deformation, good chemical stability, and the characteristics of "going in, blocking, and moving" to the formation. Excellent deep control and flooding agent (Wang Dailiu et al., Cross-linked polymer microsphere deep control and flooding technology and its application, Oil and Gas Geology and Recovery, 2008,15(2):82-88); Chinese patent "contains core-shell structure Preparation method of gel microsphere emulsion deep control and displacement agent and emulsion deep control and displacement agent (Patent No. CN 102399345 A), but strictly speaking, it can only be a deep profile control agent, which only enters the deep formation Plugging the high permeability layer forces the liquid flow to divert to increase the swept volume, but does not improve the oil washing efficiency

Method used

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  • Dissoluble polymeric microsphere deep profile modifying and flooding agent and preparation method thereof
  • Dissoluble polymeric microsphere deep profile modifying and flooding agent and preparation method thereof
  • Dissoluble polymeric microsphere deep profile modifying and flooding agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Weigh 42g white oil, 6.5g Span80, 1g OP-10, 0.8g decomposable cross-linking agent polyethylene glycol diacrylate (200) and mix them evenly, put them in a beaker as the oil phase, and weigh 25g Deionized water, 20g acrylamide (AM), 5g 2-acrylamide-2-methylpropanesulfonic acid (AMPS) are placed in a beaker as the water phase, and after completely dissolving, adjust the pH of the system with a mass fraction of 20% NaOH solution to 7-8. Mix the above-mentioned water phase and oil phase, stir with a high-shear emulsifier at a speed of 10,000r / min for 30 minutes to obtain a water-in-oil dispersion system, transfer the above-mentioned dispersion system into a three-necked flask, and pass nitrogen gas for 1 hour at the same time, add trigger Add 0.04g of V-50, and react for 3 hours at 300r / min to obtain a milky white emulsion product. If a solid powder product is required, take an appropriate amount of the product and centrifuge it with acetone / ethanol (volume ratio...

Embodiment 2

[0018] Example 2: Prepare a decomposable polymer microsphere dispersion system with a mass fraction of 0.3% with tap water, age in a 90°C thermostat, take the dispersion samples after aging for 0d, 1d, 3d, and 10d respectively, and observe under a polarizing microscope its morphology and structure, and measure the viscosity of the system. The results are shown in Table 1.

[0019] Table 1 Decomposition process of decomposable polymer microsphere deep control agent

[0020] Aging days (d)

0

1

3

7

Average particle size of microspheres (μm)

12.3

38.6

partial decomposition

completely decomposed

Viscosity (mPa·s)

2.5

3.3

15.4

27.8

[0021] From Table 1, observed under a microscope, the initial state of the microspheres is a spherical structure, the average particle size is 12.3 microns, and the viscosity is equivalent to water. It can be seen that the microspheres have a small size and are easy to injec...

Embodiment 3

[0023] Example 3: Prepare a decomposable polymer microsphere dispersion system with a mass fraction of 0.3% with clear water, add different amounts of NaCl (0g / L, 5g / L NaCl, 10g / L NaCl), and age at 90°C for different days , take it out, and measure the viscosity of the aqueous dispersion system of the decomposable polymer microsphere deep control and drive agent for different aging days. The results are shown in Table 2.

[0024] Table 2 Effect of salinity on the decomposition performance of decomposable polymer microspheres

[0025]

[0026] It can be seen from Table 2 that after aging for 1 day, the viscosity of the aqueous dispersion system of the decomposable polymer microsphere deep control and flooding agent is low, which is basically equivalent to water, which shows that it has good injectability. You can enter the deep ground. With the increase of the aging days, the viscosity of the system showed an upward trend, and reached the maximum at about 7 days, reaching ...

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Abstract

The invention discloses a dissoluble polymeric microsphere deep profile modifying and flooding agent and a preparation method thereof. The deep profile modifying and flooding agent is copolymerized by an acrylamide monomer, a temperature-resistant and salt-resistant monomer and a dissoluble crosslinking monomer, wherein the preparation method is a reversed phase suspension polymerization method. The dissoluble crosslinking monomer is a polyethylene glycol diacrylate monomer, has temperature dependency and is adaptive to different oil reservoir temperatures by adjusting the dosage and controlling the decomposition temperature and time. The dissoluble polymeric microsphere deep profile modifying and flooding agent has a micrometer size, is matched with the oil reservoir pore throat size, low in initial viscosity, easy to enter into the oil reservoir deep part, initially expanded with water immersion, similar to a deep profile control agent, and is capable of blocking a high permeable layer to promote the fluid diversion. Under the oil reservoir temperature, the deep profile modifying and flooding agent is gradually decomposed into a linear polymer, so that the water phase is tackified and the late polymer deep oil displacement is realized. A system is injected, a double function of the deep profile modifying and the deep oil displacement can be realized and a potential application value is obtained.

Description

technical field [0001] The invention relates to a decomposable polymer microsphere deep control and drive agent suitable for oil reservoir deep control and displacement, belonging to the field of oil field chemistry. Background technique [0002] Due to the heterogeneity of the reservoir itself and long-term water flooding development, at present, most oil fields in my country have entered the stage of high water cut / ultra-high water cut, facing problems such as low water injection development efficiency and difficulty in tapping the remaining oil potential. Therefore, how to improve water flooding efficiency and delay production decline is the main problem facing the current tertiary oil recovery technology. Long-term practice has proved that changing the liquid flow direction and improving the sweep coefficient through profile control and water plugging are effective measures to realize oilfield water control and oil stabilization technology. However, conventional profile...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/58C08F222/20C08F2/32C09K8/588
Inventor 于小荣蒲万芬朱强娟贾虎金发扬
Owner SOUTHWEST PETROLEUM UNIV
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