Research Article
Study and Application of Polymer Film-Forming Shielding Plugging Drilling Fluid System
Table 1
Sand bed leakage experiment.
| | Formula |
(g/cm3) | FL
(mL) | Experiment condition
(0.7 MPa, 30 min, 20~40 mesh quartz sand, room temperature) |
| | Emulsion slurry system | 1.49 | 4 | Instantaneous loss | | Slurry + 1% MFDJ | 1.49 | 3.6 | Instantaneously soak to 6 cm and 10 minutes later soak to 8.5 cm. There is no increase. Forcing to 1.2 MPa, there are also no changes. | | Slurry + 2% MFDJ | 1.49 | 3 | Instantaneously soak to 2.8 cm and 10 minutes later soak to 3.5 cm. There is no increase. Forcing to 1.2 MPa, there are also no changes. | | Slurry + 3% MFDJ | 1.50 | 2.8 | Instantaneously soak to 2 cm and 10 minutes later soak to 2.5 cm. There is no increase. Forcing to 1.2 MPa, there are also no changes. | | Slurry + 4% MFDJ | 1.50 | 2.4 | Instantaneously soak to 1.7 cm and 10 minutes later soak to 2 cm. There is no increase. Forcing to 1.2 MPa, there are also no changes. |
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MFDJ is a kind of polymer film-forming shielding plugging addictive.
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