| 摘要 |
<p>An oil or gas well cleaning method includes inserting tubing, suchas a coiled tubing (60), into a well bore (10), for example, into a production pipe (30) in a well bore (10). A cleaning fluid containing a flocculant is passed into the well and the flocculant in the cleaning fluid is mixed with solid particles (11) in the well bore (10) to flocculate the particles. The cleaning fluid and the flocculated particles are then removed from the well. In one embodiment, the cleaning fluid containing the flocculant is discharged from the lower end of the tubing (60) into the well, and the cleaning fluid with the flocculated particules is removed from the well via the production pipe (30). Alternatively, the cleaning fluid containing the flocculant may be introduced into the well through the production pipe (30), and the cleaning fluid with the flocculated particles may be removed via the tubing (60). The flocculant may also serve as a friction reducer to reduce the friction between the cleaning fluid, the solids, the production pipe (30), and the tubing (60).</p> |
