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Appl. Sci. 2017, 7(6), 594; doi:10.3390/app7060594

Zwitterionic Polymer P(AM-DMC-AMPS) as a Low-Molecular-Weight Encapsulator in Deepwater Drilling Fluid

1
School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
2
National Engineering Laboratory for Testing and Detection Technology of Subsea Equipments, Qingdao 266580, China
3
Tianjin Ruiyang Offshore Engineering Company Limited, Tianjin 300450, China
*
Author to whom correspondence should be addressed.
Academic Editor: Peter Van Puyvelde
Received: 9 April 2017 / Revised: 24 May 2017 / Accepted: 31 May 2017 / Published: 8 June 2017
(This article belongs to the Section Materials)
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Abstract

In deepwater oil and gas drilling, the high-molecular-weight encapsulator aggravates the thickening of the drilling fluid at low temperatures. Therefore, it is hard to manage the downhole pressure, and drilling fluid loss occurs. In this paper, a zwitterionic polymer P(AM-DMC-AMPS) which was the terpolymer of acrylamide, methacrylatoethyl trimethyl ammonium chloride, and 2-acrylamido-2-methylpropane sulfonic acid, was developed as a low-molecular-weight encapsulator. It was characterized by Fourier transform infrared spectrum analysis, nuclear magnetic resonance, and gel permeation chromatography. Moreover, the low-temperature rheology, shale inhibition and filtration properties of water-based drilling fluids (WBDFs) containing different encapsulators were experimentally investigated and compared. The results showed that the molecular weight of P(AM-DMC-AMPS) was about 260,000, much lower than that of the conventional encapsulators. In the deepwater drilling temperature range 4–75 °C, WBDF containing P(AM-DMC-AMPS) had lower and more stable rheological property because of its short molecular chains. The high shale recovery rate and low swelling rate indicated its strong shale inhibition performance, owing to its adsorption on the clay surface and the wrapping effect through both hydrogen bonding and electrostatic interaction. It also improved the filtration property of WBDF, and was compatible with other WBDF components. This product is expected to simultaneously realize the good encapsulation performance and low-temperature rheological property for deepwater drilling fluid. View Full-Text
Keywords: low-molecular-weight encapsulator; deepwater drilling fluid; low-temperature rheological property; shale inhibition; filtration property; zwitterionic polymer low-molecular-weight encapsulator; deepwater drilling fluid; low-temperature rheological property; shale inhibition; filtration property; zwitterionic polymer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhao, X.; Qiu, Z.; Zhang, Y.; Zhong, H.; Huang, W.; Tang, Z. Zwitterionic Polymer P(AM-DMC-AMPS) as a Low-Molecular-Weight Encapsulator in Deepwater Drilling Fluid. Appl. Sci. 2017, 7, 594.

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