Hydrocarbons Minister Carlos Villegas says the form of payment for the shares will be agreed upon in future negotiations.
Ashmore and Shell controlled about 50 percent of Transredes, with state energy company Yacimientos Petroliferos Fiscales Bolivianos, or YPFB, owning 37 percent.
Transredes'' pipelines transport natural gas to Brazil and Argentina.
President Evo Morales signed a decree recently obliging Shell and Ashmore to sell their shares to YPFB. He did not give the price.
Villegas said that exports to Brazil and Argentina won''t be affected.