A clay-free drilling fluid for protecting low-permeability reservoirs and its preparation method and application
A low-permeability reservoir and drilling fluid technology, applied in the field of drilling fluids, can solve the problems of reduced reservoir permeability, low recovery value of reservoir core permeability, unsatisfactory reservoir protection effect, etc., and achieves good rheological performance, The effect of increasing the recovery value
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment
[0042] The present invention will be described in detail through examples below, but the present invention is not limited thereby. In the following preparation examples, examples and comparative examples, unless otherwise specified, the materials used are all commercially available, and the methods used are all conventional methods in the art.
[0043] Hydrophobic associative polyacrylamide, purchased from Chengdu Chunfeng Petroleum Technology Co., Ltd.;
[0044] The structural formula of the waterproof lock agent is C 8 f 17 SO 2 NHCH 2 CH 2 CH 2 Si(OCH 2 CH 3 ) 3 , purchased from Chengdu Chunfeng Petroleum Technology Co., Ltd.;
[0045] Potassium formate, sulfonated bitumen, sulfonated lignite resin and polymer alcohol were provided by China Petroleum Group Drilling Engineering Technology Research Institute.
[0046] The nano-membrane structure reservoir protection agent is prepared according to the following preparation examples 1-4.
[0047] 2-Acrylamido-2-methy...
preparation example 1
[0054] 1. Preparation of organic montmorillonite
[0055] Put 5g of sodium montmorillonite, 3g of cetyltrimethylammonium chloride and 100ml of distilled water in a 250ml flask, stir at 120rpm in a water bath at 80°C for 4h, let stand overnight, remove the upper solution, filter, and wash with deionized water to no Cl - (with a concentration of 0.01mol / L AgNO 3 solution test), dried in a vacuum oven at 70°C, and crushed through a 300-mesh sieve to obtain organic montmorillonite (O-MMT).
[0056] 2. Preparation of nano-membrane structure plugging agent
[0057] (1) In a three-necked flask equipped with a thermometer and a mechanical stirrer, add styrene, benzyl dithiobenzoate and azobisisobutyronitrile at a molar ratio of 400:1:0.4, and add styrene 5% by weight of organic montmorillonite, after sealing the reaction device, the air in the system was removed by freezing and vacuuming, filled with nitrogen, and circulated for 3 times, fully stirred under the protection of nitrog...
preparation example 2
[0060] Prepare organic montmorillonite according to the method of preparation example 1, and the preparation method of nano-membrane structure sealing agent is as follows:
[0061] (1) In a three-necked flask equipped with a thermometer and a mechanical stirrer, add p-methylstyrene, cumyl dithiobenzoate and azobisisoheptanonitrile at a molar ratio of 200:1:0.3, And add organic montmorillonite accounting for 3% by weight of p-methylstyrene, seal the reaction device, remove the air in the system by freezing and evacuating, fill with nitrogen, cycle 3 times, fully stir under the protection of nitrogen, and heat at 130 ° C The reaction was carried out in an oil bath. After reacting for 2.5 hours, the reaction system was cooled with an ice-water bath, and the product was precipitated in methanol, filtered, and then dried in vacuum at 70° C. to obtain poly-p-methylstyrene / montmorillonite nanocomposite macromolecular chain transfer agent.
[0062] (2) In the there-necked flask equip...
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com