A kind of natural carboxylate-polymer microsphere binary compound flood control system and its preparation and application

A binary compound and polymer technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of low saturation and low degree of recovery

Inactive Publication Date: 2011-12-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These profile control methods mainly improve the seepage conditions near the water injection wells, and increase the swept volume near the water injection wells. However, the remaining oil saturation near the water injection wells is small, so the recovery factor is not greatly improved.

Method used

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  • A kind of natural carboxylate-polymer microsphere binary compound flood control system and its preparation and application
  • A kind of natural carboxylate-polymer microsphere binary compound flood control system and its preparation and application
  • A kind of natural carboxylate-polymer microsphere binary compound flood control system and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Example 1: Determination of oil-water interfacial tension between natural mixed carboxylate and Gudao East heavy oil

[0067] Raw material: natural mixed carboxylate 3.0g.

[0068] Natural mixed carboxylate is composed of the following ingredients: animal oil soap 2%, peanut oil soap 4%, soybean oil soap 2%, cottonseed oil soap 90%, tea saponin 2%. For the preparation method, refer to CN1069913A (CN96109015.4).

[0069] Sewage 997g, sewage after oil-water separation in the east area of ​​Gudao Oil Production Plant.

[0070] Add the above raw materials into a mixer with stirring, and stir at room temperature for 3-4 hours.

[0071] Experimental process: when the temperature is 70°C and the speed is 5000 rpm, the lowest interfacial tension measured is 3.2×10 -4 mN / m.

Embodiment 2

[0072] Example 2: Evaluation of plugging performance of polymer microspheres

[0073] 1. Preparation of polymer microspheres:

[0074] (1) Preparation of water-soluble monomer solution: Dissolve 10g of water-soluble anionic monomer 2-acrylamido-2-methylpropanesulfonic acid in 12g of deionized water, add 2.5g of dispersant polyvinylpyrrolidone, stir, and then add 31g of acrylamide monomer is fully stirred until the solution is clear and free of solid insolubles, then the solution is adjusted to pH = 7 with NaOH solution, 0.25g of cross-linking agent polyethylene glycol diacrylate is added, and stirred for 1 to 2 hours;

[0075] (2) Emulsion system preparation: Take 10g of Span-80 and dissolve it in 22g of toluene. After fully dissolving, gradually add the water-soluble monomer solution in step (1) and fully stir to obtain a transparent emulsion polymerization reaction system;

[0076] (3) photopolymerization reaction: 1g photoinitiator benzoin methyl ether is dissolved with 1....

Embodiment 3

[0085] Example 3: Preparation of Binary Composite Regulating and Flooding System

[0086]Raw materials: the polymer microspheres of Example 2 and the natural mixed carboxylate of Example 1.

[0087] Suspending agent: partially hydrolyzed polyacrylamide (HPAM), molecular weight 18 million, degree of hydrolysis 28%, product of Shengli Oilfield Polymer Co., Ltd.

[0088] Water: Sewage from the east area of ​​Gudao Oil Production Plant of Shengli Oilfield.

[0089] Preparation: Take 300.0g concentration of 1.0% polymer microsphere mother liquor, swell at constant temperature for 15 days at 70°C, add 3.0g natural mixed carboxylate, 0.5g suspending agent HPAM, and 696.5g sewage into a mixer with stirring, Stir at room temperature for about 4 hours.

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Abstract

The invention relates to a natural carboxylate-polymer microballoon binary composite control system, and a preparation and application thereof. The binary composite control system comprises raw materials of: 0.1-0.5% of polymer microballoon, 0.05-0.5% of natural mixed carboxylate, 0.05% of suspending agent polyacrylamide and the balance of water. The binary composite control system of the invention has effects of profile control and plugging, strong oil scrubbing ability, and can effectively solve a problem of crude oil recovery ratio increase after polymer flooding and avoid damages to stratum and oil extraction equipment caused by alkali.

Description

technical field [0001] The invention relates to a binary compound control and flooding system for enhancing oil recovery after polymer flooding, in particular to a binary compound control and flooding system composed of natural mixed carboxylate and polymer microspheres, which is suitable for the technical field of tertiary oil recovery in oil fields. Background technique [0002] Oil is known as the "blood" of industry and is an important strategic material. The exploitation of crude oil can be divided into three stages: the first stage refers to the self-spraying of crude oil by the pressure of the formation, which is called primary oil recovery, and the recovery rate is about 15wt%; in the later stage of self-spraying, water can be injected from the well Maintaining the formation pressure is called secondary oil recovery, and the recovery rate is about 15-20wt%. After water flooding, the residual oil in the formation still accounts for 60-70wt%, which needs to be driven o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588
Inventor 于丽赵英渊宋岱锋肖建洪陈辉王晓晴焦静静
Owner SHANDONG UNIV
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