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Fluid loss reducer for drilling fluid and its preparation method and application

A fluid loss reducing agent, drilling fluid technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of poor fluid loss reducing ability, poor temperature resistance and salt resistance, complex synthesis methods, etc. The effect of low, strong filtration loss reduction ability and simple synthesis method

Active Publication Date: 2015-08-19
北京培康佳业技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are many fluid loss reducers used in the oil field drilling process, most of which are polymer products (mainly copolymerized from acrylic acid, acrylonitrile, acrylamide, etc.), which have poor temperature and salt resistance. Unsatisfactory fluid loss reduction effect in saturated brine drilling fluid
In drilling fluids with higher concentrations of organic salts, the fluid loss control effect is even worse, and sometimes even fails completely
This kind of product has poor filter loss reduction ability, more dosage is added when preparing drilling fluid, and the synthesis method is more complicated, and the price of synthetic monomer is more expensive, resulting in higher cost of the prepared drilling fluid

Method used

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  • Fluid loss reducer for drilling fluid and its preparation method and application
  • Fluid loss reducer for drilling fluid and its preparation method and application
  • Fluid loss reducer for drilling fluid and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 32 parts of water according to the weight ratio and add it to the kneader (Nantong Fanshi Machinery Co., Ltd. SYH1500 kneader), add 4.5 parts of cotton cellulose, 2.0 parts of AMPS and 1.0 part of NNDMA under stirring, and stir at room temperature for 20 minutes until uniform . Stop stirring, add 0.001 parts of 10% FeCl successively 2 aqueous solution and 0.0002 parts of tert-butyl hydroperoxide to initiate the reaction. After the above raw materials were reacted for 3 hours, a cellulose graft copolymer gel was obtained. Take the gel out of the kneader, granulate it with a jelly crushing granulator, add 0.75 parts of 20% NaOH aqueous solution to hydrolyze and neutralize for 1.5 hours to obtain graft copolymer particles, and dry it at 110°C for 6 hours Pulverize, promptly make the fluid loss control agent for drilling fluid of this embodiment.

Embodiment 2

[0027] Get 35 parts of water by weight and join in the kneader (Nantong Fanshi Machinery Co., Ltd. SYH1500 type kneader), add 5.0 parts of wood pulp cellulose, 2.5 parts of AMPS and 1.5 parts of NNDMA under stirring, stir after 20 minutes at normal temperature to uniform. Stop stirring, add 0.001 parts of 10% FeCl successively 2 aqueous solution and 0.00025 parts of tert-butyl hydroperoxide to initiate the reaction. After reacting the above raw materials for 3.5 hours, a cellulose graft copolymer gel was obtained. The gel was taken out from the kneader, granulated with a jelly crushing granulator, and then 1.6 parts of 15% NaOH aqueous solution was added for hydrolysis and neutralization for 2 hours to obtain graft copolymer particles, which were dried at 115°C for 6.5 hours Pulverize, promptly make the fluid loss control agent for drilling fluid of this embodiment.

Embodiment 3

[0029] Take 36 parts of water according to the weight ratio and add it to the kneader (Nantong Fanshi Machinery Co., Ltd. SYH1500 kneader), add 6.0 parts of cotton cellulose, 3.0 parts of AMPS and 1.5 parts of NNDMA under stirring, and stir at room temperature for 20 minutes until uniform . Stop stirring, add 0.002 parts of 10% FeCl successively 2 aqueous solution and 0.0002 parts of tert-butyl hydroperoxide to initiate the reaction. After the above raw materials were reacted for 4 hours, a cellulose graft copolymer gel was obtained. The gel is taken out from the kneader, granulated with a jelly crushing granulator, and then added with 1.8 parts of 20% NaOH aqueous solution for hydrolysis and neutralization for 1 hour to obtain graft copolymer particles, which are then dried at 120°C for 5.5 hours Pulverize, promptly make the fluid loss control agent for drilling fluid of this embodiment.

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Abstract

The invention provides a filtrate reducer used for drilling fluids as well as a preparation method and an application thereof. The preparation method comprises the following steps that cellulose, 2-acrylamide-2-methyl propane sulfonic acid, N,N-dimethylacrylamide and water are mixed at the weight ratio of (4.2-6.6): (1.8-3.3): (0.7-1.7): (30-36), then an initiating agent is added into the mixture to trigger a reaction, granulation is conducted after the reaction lasts for 2-5 hours, alkaline matter is added into the mixture and is hydrolyzed and neutralized under a heating condition, then the mixture is dried and smashed, and the salt-tolerant filtrate reducer used for the drilling fluids is obtained. The compounding method of the filtrate reducer is simple, low in cost and high in filtrate reduction capacity. The drilling fluids obtained after the salt-tolerant filtrate reducer obtained with the method is added to the drilling fluids in an oil field have the advantages of good salt-tolerant and calcium-resistant effects, low filter loss and the like.

Description

technical field [0001] The invention relates to a fluid loss reducer for oilfield drilling fluid and its preparation method and application, specifically a salt-resistant fluid loss reducer prepared from cellulose as the main raw material for oilfield drilling fluid and its preparation method. Preparation method and application. Background technique [0002] In oil drilling operations, fluid loss reducers are added to the drilling fluid to reduce the fluid loss of the drilling fluid. Filtrate reducer is an important treatment agent for drilling fluid to ensure the stability of drilling fluid performance, reduce the loss of harmful gases to the formation, protect the oil and gas layers, ensure the stability of the well wall and regular well diameter. [0003] At present, there are many fluid loss reducers used in the oil field drilling process, most of which are polymer products (mainly copolymerized from acrylic acid, acrylonitrile, acrylamide, etc.), which have poor temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/02C08F220/58C08F220/54C08F8/12C09K8/035
Inventor 姚少全
Owner 北京培康佳业技术发展有限公司
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