| abstract |
It is an object of the present invention to provide a composition for treating an underground layer having a highly stable viscosity with respect to a temperature change and having a high water-stopping property. An underground treatment composition containing fine cellulose fibers having a substituent of 0.14 to 2.5 mmol / g is used. The substituent is preferably an anionic group, particularly a phosphate group. The present invention also provides various fluids used during well treatment. The present invention further provides methods for treating underground layers such as drilling of test wells, evaluation wells, exploration wells, exploration wells, development wells, production wells, injection wells, observation wells, service wells, etc .; cementing; fracturing; Provide resource production methods. |