Microsphere-shaped double-comb type block polymer profile control and flooding agent and preparation method thereof

A block polymer, double-comb type technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of short cross-linking time, poor fluidity, and difficulty in going deep into the formation, and achieves improved solubility, increased Temperature resistance, the effect of increasing the dissolution rate

Active Publication Date: 2017-10-24
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, after long-term field application, it is found that most of the existing control and drive agents have large initial particle size, short cross-linking time, too fast viscosity-increasing speed, and poor fluidity, so that they start to swell before they are injected into the well pipe. , not easy to transport to deep formations
Even if it enters the formation, due to the early expansion of the control and displacement agent in the ground liquid distribution tank, the water blocking particles will be squeezed to rupture by the shear force of the formation and the screen during the pumping process, and then lose the water blocking and regulating ability
[0006] Therefore, the traditional water plugging and flooding agent can only play the role of regulating and flooding at the shallower layer from the water injection well, and it is difficult to penetrate deep into the formation.

Method used

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  • Microsphere-shaped double-comb type block polymer profile control and flooding agent and preparation method thereof
  • Microsphere-shaped double-comb type block polymer profile control and flooding agent and preparation method thereof
  • Microsphere-shaped double-comb type block polymer profile control and flooding agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0044] This embodiment firstly provides a kind of aerosol equipment, its structure is as follows figure 1 As shown, the aerosol device includes:

[0045] Mother liquor tank 1, three spray guns 2, first screening tower 3, second screening tower 4, third screening tower 5, blower 6 and induced draft fan 7;

[0046] Wherein, the mother liquor tank 1 is communicated with the first screening tower 3, and a spray gun 2 is arranged between the mother liquor tank 1 and the first screening tower 3; a plunger pump 8 is arranged on the spray gun 2; the first screening tower 3, the second The screening tower 4 and the third screening tower 5 are connected in sequence; the blower 6 is connected with the first screening tower 3; the induced draft fan 7 is connected with the third screening tower 5; the gun head of the spray gun 2 is set on the first screening tower 3 The upper end of the interior.

[0047] This embodiment provides a method for preparing a microspherical double-comb block ...

Embodiment 2

[0056] This embodiment provides a method for preparing a microspherical double-comb block polymer control and displacement agent, which specifically includes the following steps:

[0057] (1) Solution preparation: in molar parts, acrylamide monomer, epoxyoctane, 2-acrylamido-2-methylpropanesulfonic acid and acrylic acid monomer are prepared according to the ratio of 50:23:19:7 Concentration is 28% aqueous solution, add pH adjusting agent (sodium bicarbonate), adjust pH to 7.5;

[0058] (2) Polymerization process: Continuously feed 99.999% high-purity nitrogen at a constant temperature of 12° C. After 40 minutes, redox composite initiators (composed of diethylenetriamine, potassium persulfate, and potassium bisulfite, each component’s The mass ratio is 3:2:1), and this process continues to feed high-purity nitrogen, and the addition amount of redox composite initiator is monomer (monomer refers to acrylamide monomer, and hexane oxide is prepared to have a concentration of 28% ...

Embodiment 3

[0063] This embodiment provides a method for preparing a microspherical double-comb block polymer control and displacement agent, which specifically includes the following steps:

[0064] (1) Solution preparation: in molar parts, acrylamide monomer, 1,2-epoxydodecane, 2-acrylamidotetradecanesulfonic acid and acrylic acid monomer are in the ratio of 45:25:12:5 It is prepared into an aqueous solution with a concentration of 35%, and a pH regulator (sodium bicarbonate) is added to adjust the pH to 7;

[0065] (2) Polymerization process: Continuously feed 99.999% high-purity nitrogen at a constant temperature of 15°C, and add redox composite initiators (by N,N,N',N'-tetraethylethylenediamine, persulfuric acid) in sequence after 30 minutes Ammonium, ammonium bisulfite, the mass ratio of each component is 4:2:1), this process continues to feed high-purity nitrogen, the addition of redox composite initiator is monomer (monomer refers to acrylamide mono Monomer and hexane oxide are p...

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Abstract

The invention provides a microsphere-shaped double-comb type block polymer profile control and flooding agent and a preparation method thereof. The preparation method comprises the following steps: preparing an acrylamide monomer, long-chain alkylene oxide, acrylyl amino sulfonate and an acrylic avid monomer into a water solution; adding a pH (Potential of Hydrogen) regulator for adjusting the pH value to be 6 to 8; introducing nitrogen gas at the temperature of 0 DEG C to 15 DEG C; adding an oxidation reduction complex initiator and polymerizing for 3h to 10h; hydrolyzing under water-bath temperature of 70 DEG C to 90 DEG C for 1h to 4h; drying at 60 DEG C to 90 DEG C for 4h to 8h; crushing and sieving; dissolving a product into a lipophilic solvent and stirring under the water-bath temperature of 20 DEG C to 35 DEG C for 1h to 4h; heating to 40 DEG C to 50 DEG C and granulating to prepare the microsphere-shaped double-comb type block polymer profile control and flooding agent. The invention further provides the microsphere-shaped double-comb type block polymer profile control and flooding agent prepared by the method provided by the invention. The microsphere-shaped double-comb type block polymer profile control and flooding agent provided by the invention has good adaptability with a reservoir stratum and can effectively enter a deep part of the reservoir stratum, so that an efficient profile control and flooding effect is realized and the crude oil recovery factor is greatly improved.

Description

technical field [0001] The invention relates to a flood control agent and a preparation method thereof, in particular to a microspherical hydrophilic-hydrophobic double-comb block macromolecule polymer flood control agent with controllable swelling time and a preparation method thereof, belonging to polymer polymerization The technical field of material preparation. Background technique [0002] With the continuous acceleration of oilfield exploitation, most oilfields in my country and even in the world have entered the stage of high water cut, which puts forward new requirements and challenges for how to further improve oil recovery. [0003] Nowadays, water injection well control and flooding technology and oil well water plugging technology have become important technical means for tertiary oil recovery, and are also indispensable supporting technologies for improving the water injection development effect of oilfields, realizing stable production of oil reservoirs, and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C08F293/00
CPCC08F293/005C09K8/588
Inventor 薛俊杰朱卓岩欧阳坚王凤王源源陈国浩王超
Owner PETROCHINA CO LTD
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