Method for preparing temperature-resistant anti-salt amphoteric polymer filtrate reducer

A technology of amphoteric polymer and fluid loss reducer, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of low polymerization conversion rate, imidization reaction, slow reaction speed, etc., and achieve the molecular weight of the product. High, good polymerization stability, fast reaction effect
CN101864030AInactive Publication Date: 2010-10-20CHENGDU UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGDU UNIVERSITY OF TECHNOLOGY
Publication Date
2010-10-20
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention relates to a method for preparing a temperature-resistant anti-salt amphoteric polymer filtrate reducer used for drilling fluid. In the filtrate reducer, C6 to C10 paraffin hydrocarbons are used as a continuous phase; Span and Tween are used as a compound non-ionic surface active agent, wherein the mass ratio of the Span to the Tween is 2-4:1-3; three monomers, namely acrylamide(AM), acrylic acid(AA) and styrene sulfonic sodium(SSS), are used as raw materials in a mass ratio of 10:3-6:1-4; and an initiator of ammonium persulphate or redox initiator of ammonium persulphate-sodium bisulphite is added for copolymerization by adopting an opposite micro-emulsion polymerization method to obtain the filtrate reducer. The filtrate reducer provided by the invention has the advantages of higher temperature resistance, salt resistance and filtrate-reducing property, simple preparation method, mild and controllable reaction conditions, high polymerization stability, high reaction speed and high conversion rate.
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Description

1. Technical field

[0001] The invention relates to a temperature-resistant and salt-resistant water-soluble polymer fluid loss reducer and a preparation method thereof. 2. Technical background

[0002] Fluid loss control agent is an important drilling fluid treatment agent used to ensure stable performance of drilling fluid, reduce the invasion of harmful liquid into formation, and ensure regular well diameter and stable well wall. With the increasingly complex strata encountered and the increase in the number of special wells, ultra-deep wells and complex wells, higher requirements are put forward for drilling fluid fluid loss reducers to meet the salt tolerance (NaCl concentration greater than 10%, CaCl2 concentration greater than 5%) and new requirements for temperature resistance (temperatures above 150°C). Gelatinized starch, carboxymethyl cellulose, lignite, etc. are the earliest fluid loss control agents used in drilling fluids. With the deepening of research and th...

Claims

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