Experiment on Nanoparticle Active Oil Water Plugging Agent in Tahe Gas Field

doi:10.7657/XJPG20210214

Abstract

Abstract:

The gel was used in Tahe gas field to plug water in the early production stage and a significant effect was obtained in vertical wells, but it could not meet long-term water control requirements for horizontal wells. Aiming at the water plugging characteristics in horizontal wells, a nanoparticle active-oil water plugging agent was developed, which was composed of nanoparticles, emulsifier imidazoline and diesel. The water plugging agent is easy to be injected, and can form a kind of water-in-oil emulsion due to micro shear force of the formation water. The viscosity of the water-in-oil emulsion will increase under the action of high temperature and nanoparticles. The Jamin effect of the emulsion prevents the formation water from entering highly permeable channels, thereby reducing the water production rate. In the low-permeability channels, the nanoparticles in the system change the wettability of the reservoir to release the water lock of the channels. The emulsion will be diluted by condensate oil, so it will not block the gas channels. Laboratory evaluations show that the system has good selective water control capabilities with strong erosion resistance and a maximum residual resistance coefficient of 27, which can reduce the water production rate and restore gas production in gas wells.

Key words: Tahe gas field, condensate gas reservoir, horizontal well, water lock, emulsion, nanoparticle, water plugging agent, wettability, water production rate

CLC Number:

TE37

YANG Liping, GE Jijiang, SUN Xiangyu. Experiment on Nanoparticle Active Oil Water Plugging Agent in Tahe Gas Field[J]. Xinjiang Petroleum Geology, 2021, 42(2): 218-223.

Figures/Tables 6

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Table 1

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