Gelling agent for gelled acid system and preparation and application thereof

A technology of gelling agent and gelling acid, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., which can solve the problem of instability of gelling agent, inability to use high-temperature deep well reservoirs, and limited temperature resistance of gelling acid system and other problems, to achieve the effect of good temperature resistance, good practicability, and simple preparation process

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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing gelling agents are unstable (degraded) under high temperature conditions, resulting in limited temperature resistance of the gelling acid system and cannot be used in high-temperature deep well reservoirs

Method used

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  • Gelling agent for gelled acid system and preparation and application thereof
  • Gelling agent for gelled acid system and preparation and application thereof
  • Gelling agent for gelled acid system and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0039] Examples 1-4: Preparation of gelling agent.

[0040] (1) Prepare 20% sodium hydroxide solution, and use the solution to neutralize the 2-acrylamido-2-methylpropanesulfonic acid in the three-necked flask.

[0041] (2) After the neutralization reaction is completed, lower the temperature in the three-neck flask to 10°C, add acryloyloxyethyltrimethylammonium chloride, acrylamide, etc., and water in sequence, and stir evenly.

[0042] (3) Nitrogen gas was passed into the neutralization three-necked bottle to drive away oxygen for 40 minutes to obtain a comonomer mixture.

[0043] (4) Put the comonomer mixture into the polymerization chamber in batches, add the set initiator, seal the reaction for 5 hours, and synthesize the jelly-state gelling agent.

[0044] (5) Take out the jelly-state gelling agent, cut and granulate, dry, pulverize, and sieve to obtain the finished product of dried gelling agent granules.

[0045]Examples 1-4 The composition of the comonomer mixture, ...

Embodiment 5-10

[0049] Examples 5-10: Preparation of gelled acid systems for oil and gas wells.

[0050] The gelling agents prepared in the above-mentioned Examples 1-4 were used to prepare cross-condensing acid systems for oil and gas wells. The preparation method was as follows: add part of the analytically pure hydrochloric acid to an appropriate amount of water and stir evenly to form a 15-25% solution Stir at 15-30°C, add the gelling agent evenly into the prepared hydrochloric acid solution, stop stirring for 0.5-1h, seal the container, let it stand for 3-5h to fully swell and mature evenly; continue stirring for 0.5 After ~1 hour, add multifunctional additives (corrosion inhibitor, iron ion stabilizer, demulsifier and drainage aid) according to the proportion, and after stirring evenly, the temperature-resistant gelling acid system for acidification and acid fracturing of oil and gas wells (that is, oil and gas well with gelled acid systems).

[0051] Determination of the rheology and ...

Embodiment 11

[0059] Example 11: Core flooding experiment under simulated formation conditions (95°C).

[0060] The gelled acid system prepared in Example 5 was subjected to a core displacement experiment under simulated formation conditions (95° C.) using a short core acidizing flow tester.

[0061] Experimental method: Through the core displacement experiment, record the pressure, flow rate at both ends of the core and the basic parameters of the core and fluid during the experiment, and calculate the change process and change of the core permeability before acidification, during acidification and after acidification according to Darcy's formula To analyze the improvement of the core permeability by the gelled acid system; at the same time, by injecting liquid paraffin into the acidified core, after the core cools, the paraffin solidifies in the pore channels of the core, leaving a model of the acid-rock reaction. Reflect the etched form and characteristics of acid and rock.

[0062] The...

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Abstract

The invention relates to a gelling agent for gelled acid system and preparation and application thereof. The gelling agent is a copolymer of three monomers, i.e., acryloyloxyethyl trimethyl ammonium chloride, acrylamide and 2-acrylamide-2-methyl propyl sulfonate, and has a molecular weight of 8000000-15000000 Dalton, and as to ratios of the three monomers, a molar ratio of the acrylamide to the 2-acrylamide-2-methyl propyl sulfonate is (0.20-96.75):1, and a molar ratio of the acryloyloxyethyl trimethyl ammonium chloride to the 2-acrylamide-2-methyl propyl sulfonate is (7.40-201.21):1. The gelling agent prepared herein and the gelled acid system have good temperature tolerance, good retardancy and good corrosion inhibition and are applicable to reforming of deep-well high-temperature reservoirs.

Description

technical field [0001] The invention belongs to the technical field of oil field reservoir reconstruction, and in particular relates to a gelling agent used in a gelling acid system and its preparation and application. Background technique [0002] Carbonate reservoirs occupy a very important position in the world's oil and gas fields. According to the statistics of 14 super giant oil fields in the world's oceans, 83% of the reservoirs come from carbonate rock deposits. Carbonate oil and gas fields have been found in 57 sedimentary basins in nearly 40 countries and regions in the world, and their oil and gas reserves account for 48% and 28% of the world's total oil and gas reserves, respectively. Accounting for about 60% and 30% of the world's total oil and gas production, a large number of carbonate oil and gas reservoirs have been proved in many oil and gas fields in China. [0003] Fracturing and acidizing is a commonly used stimulation technology for carbonate reservoi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/34C08F220/56C08F220/58C09K8/74
Inventor 吴川张祖国蒋建方苏建政张汝生龙秋莲
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