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A multi-functional high temperature resistant composite well killing fluid and its preparation method and application

A multi-functional, well-killing fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high temperature resistance, corrosion side effects, oil and gas layer damage, etc. High temperature performance, low oil layer damage effect

Inactive Publication Date: 2017-05-10
BEIJING BODA SHIKE SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Based on the above-mentioned shortcomings, the present inventors have devoted themselves to research, aiming at the oil and gas layer damage, corrosion side effects and intolerance caused by the solid phase in the killing fluid flowing into the formation caused by the killing fluid in the production and workover process of the existing oil and gas wells. Many defects such as high temperature, through in-depth research, after paying a lot of creative work, thus obtained a multifunctional anti-high temperature killing fluid, and then completed the present invention

Method used

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  • A multi-functional high temperature resistant composite well killing fluid and its preparation method and application
  • A multi-functional high temperature resistant composite well killing fluid and its preparation method and application
  • A multi-functional high temperature resistant composite well killing fluid and its preparation method and application

Examples

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preparation example 1

[0055] Preparation Example 1: Preparation of Quaternary Ammonium Salt Cationic Polymer

[0056] Add epichlorohydrin dropwise in diethylamine, wherein the mol ratio of diethylamine and epichlorohydrin is 1.1:1; add ammonium persulfate-sodium bisulfite initiator system again after dropwise addition, wherein over The molar ratio of ammonium sulfate to sodium bisulfite is 1.5:1, and the ratio of the total molar amount of the two to the molar amount of epichlorohydrin is 0.06:1; the reaction temperature is controlled between 15-20°C, and the After adding the reagent, raise the temperature to 40°C and react for 40 minutes; after the reaction, filter the resulting reaction mixture, then wash it with ethyl acetate and n-hexane in sequence, and dry it in a vacuum oven at 70-80°C for 1-2 Hour, obtain light yellow viscous liquid, be described quaternary ammonium salt cationic polymer, name Q1, after measuring its number average molecular weight is 30000-35000.

preparation example 2

[0057] Preparation Example 2: Investigation of Initiator Consumption During Preparation of Quaternary Ammonium Salt Cationic Polymer

[0058] Add epichlorohydrin dropwise in diethylamine, wherein the mol ratio of diethylamine and epichlorohydrin is 1.2:1; Add ammonium persulfate-sodium bisulfite initiator system again after dropwise addition, wherein over The molar ratio of ammonium sulfate to sodium bisulfite is 1.5:1, and the ratio of the total molar amount of the two to the molar amount of epichlorohydrin is shown in Table 1 below; the reaction temperature is controlled between 15-20°C, After the initiator was added, the temperature was raised to 40°C for 40 minutes; after the reaction, the resulting reaction mixture was filtered, then washed with ethyl acetate and n-hexane in sequence, and dried in a vacuum oven at 70-80°C for 1 -2 hours, to obtain a light yellow viscous liquid, namely to obtain the quaternary ammonium salt cationic polymer, its designation and number aver...

preparation example 3

[0062] Preparation Example 3: Investigation of Temperature During Preparation of Quaternary Ammonium Salt Cationic Polymer

[0063] Add epichlorohydrin dropwise in diethylamine, wherein the mol ratio of diethylamine and epichlorohydrin is 1.1:1; add ammonium persulfate-sodium bisulfite initiator system again after dropwise addition, wherein over The molar ratio of ammonium sulfate to sodium bisulfite is 1.5:1, and the ratio of the total molar amount of the two to the molar amount of epichlorohydrin is 0.06:1; the reaction temperature is controlled between 15-20°C, and the After the addition of the reagent, the temperature was raised to the temperature shown in Table 2 below and reacted for 40 minutes; after the reaction, the resulting reaction mixture was filtered, then washed with ethyl acetate and n-hexane in sequence, placed in a vacuum oven at 70- Dry at 80°C for 1-2 hours to obtain a light yellow viscous liquid, that is, to obtain a quaternary ammonium salt cationic polym...

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Abstract

The invention relates to a multifunctional type high-temperature-resistant composite well control fluid. The well control fluid comprises the following components in parts by weight (the weight part sum of all components is 100): 3-5 parts of quaternary ammonium salt cationic polymer, 1-3 parts of thickener, 2-4 parts of high-temperature-resistant leak-off agent, 15-60 parts of density modifier, 1-3 parts of auxiliaries, and the balance of water. The invention further provides a preparation method of the multifunctional type high-temperature-resistant composite well control fluid. Research findings prove that the well control fluid has multiple excellent effects, can be used for petroleum exploration and development, and has good industrial application potential and market values in industry.

Description

technical field [0001] The present invention relates to a composition for oil and gas well production and workover during oilfield development, more particularly to a multi-functional compound anti-high temperature well killing fluid and its preparation method and use, belonging to Petroleum exploration and oil and gas development technology field. Background technique [0002] In the oil and gas well workover operation in the field of petroleum development, in order to balance the pressure of formation fluid, it is necessary to add well killing fluid to the wellbore to balance the pressure of formation fluid, so as to ensure the safety of workover operation. [0003] In addition, due to the water-sensitivity phenomenon of formation viscous minerals and the flow of solid phase particles in the well killing fluid into oil and gas layers, it is also necessary to add various substances such as anti-swelling agents and anti-high temperature fluid loss reducers to the well killin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12C08G73/00
CPCC09K8/12
Inventor 雒贵明刘平德
Owner BEIJING BODA SHIKE SCI & TECH DEV
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