Cross-linking agent and organogel water blocking agent and its preparation method and application

A technology of organic gel and water blocking agent, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well parts, etc., which can solve the problems of polymers such as weak temperature resistance and salinity resistance, and achieve thermal stability Good, the agent is safe and non-toxic, and the effect of increasing the benefit and recovery rate

Active Publication Date: 2022-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing polymer gel plugging agent system, due to the weak temperature resistance and salinity resistance of the polymer, there is still a big gap between these polymer gel plugging agent systems and the application requirements of the oil field

Method used

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  • Cross-linking agent and organogel water blocking agent and its preparation method and application
  • Cross-linking agent and organogel water blocking agent and its preparation method and application
  • Cross-linking agent and organogel water blocking agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Chemical modification of crosslinking agent: take 40g polyethyleneimine (PEI, M=3.0×10 3 , 30 wt% aqueous solution) was placed in a reaction flask with a condenser, a thermometer, a stirring bar and an addition funnel. While stirring, take 9ml of acetic anhydride into the addition funnel and slowly add it into the reaction flask. After the addition of acetic anhydride is complete, stir the reactant at 60°C to 70°C for 3 hours, cool to room temperature and take it out. The degree of carboxylation was 45% by titration method, and the pH value of the solution was adjusted to 7.0 with 50 wt% sodium hydroxide solution. The concentration of PEI in the product was adjusted to 12 wt% with water to obtain polymer modified crosslinking agent PEI-A 1#.

[0050] (2) Preparation of polymer organogel water blocking agent solution: take 1.25g polyacrylamide (M=8.0×10 6 , degree of hydrolysis 3%) add 60g water, stir for 4 hours until polyacrylamide is completely dissolved; then t...

Embodiment 2

[0064] (1) Chemical modification of crosslinking agent: take 40g polyethyleneimine (PEI, M=1.5×10 4 , 35wt% aqueous solution) was placed in a reaction flask with a condenser, a thermometer, a stirring bar and an addition funnel. While stirring, put 12ml of acetic anhydride into the addition funnel and slowly add it into the reaction flask. After the addition of acetic anhydride is complete, stir the reactant at 60°C to 70°C for 3 hours, cool it to room temperature, take it out, and take a small amount for use. The degree of carboxylation was tested by titration, and the result was 50%, and the pH value of the solution was adjusted to 7.0 with 50 wt% sodium hydroxide solution. The concentration of PEI in the product was adjusted to 12 wt% with water to obtain polymer modified cross-linking agent PEI-A 2#.

[0065] (2) Polymer organogel water blocking agent solution preparation: get 0.8g acrylamide / tert-butyl acrylate copolymer (acrylamide 95wt% in the copolymer, tert-butyl acr...

Embodiment 3

[0074] (1) Preparation of polymer organogel water blocking agent solution: take 0.2g polyacrylamide (M=1.2×10 7 , degree of hydrolysis 10%) add 75g water, stir 4 hours to dissolving completely, then add mineral salt according to the prescription of preparing simulated brine to form simulated brine (total salinity of solution=201240mg / L, the total amount of calcium and magnesium ions 5000mg / L, sodium chloride 18.5wt%, anhydrous calcium chloride 1.14wt%, magnesium sulfate hexahydrate 0.865wt%), after stirring and dissolving, add 0.4g polymer modified cross-linking agent PEI-A 2# , 0.2g sodium bicarbonate, 0.3g edetate sodium salt, 0.5g glycine, make up the total mass of the solution with water to 100g, stir well and set aside.

[0075] (2) Gelling time and thermal stability test: After the polymer organogel water blocking agent solution is prepared, put the solution into a vial and seal it with a cap, put it in a 90°C oven, observe and record the gelling time, Placed in an oven...

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Abstract

The invention discloses a crosslinking agent, which comprises an amino and / or imine group-containing polymer modified by a carboxylating agent; the invention also discloses a method for preparing the crosslinking agent, an organic gel plug Water agent and its application in oil field. The crosslinking agent and water shutoff agent provided by the invention are suitable for water shutoff construction in oil fields, especially for selective shutoff of oil reservoirs under harsh conditions such as high temperature deep wells, large pores, high salinity, and ultra-high calcium and magnesium ions. It has strong plugging ability, adjustable gelling time, and is easy to use, which is of great significance to the efficient development of my country's oilfields and the stabilization of oil production and precipitation.

Description

technical field [0001] The invention belongs to the field of water shutoff agents for oilfield development, and in particular relates to crosslinking agents and organogel water shutoff agents and their preparation methods and applications. Background technique [0002] Most of my country's onshore oilfields have entered the stage of high water cut development, and the comprehensive water cut of oil well production fluid is often above 90%, and the efficiency of water flooding is very low. At the same time, the separation and treatment of water in the produced fluid will generate huge economic costs. According to statistics, the world petroleum industry spends about 4.5×10 per year to deal with excess water production. 10 Dollar. Therefore, in order to increase oil production and reduce water production, water plugging and profile control technology came into being. [0003] At present, the most commonly used water plugging and profile control technology in oil fields is c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/04C09K8/512E21B33/138
CPCC09K8/512E21B33/138C08G73/0213C08G73/0206
Inventor 赵梦云张汝生黄志文张锁兵马玉生范凌霄王晓峰郑承纲
Owner CHINA PETROLEUM & CHEM CORP
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