Method of treating the near-wellbore zone of the reservoir

摘要

The invention describes a method for treating near-wellbore zones involving the steps of injecting a magnesium metal with a catalyst into the desired area of the formation to be treated. Subsequently, combustive-oxidizing solution (COS) is injected into the zone of the formation to be treated. The COS initially reacts with the magnesium, which in turn initiates a vigorous oxidation reaction of the COS. The reaction gases and heat produced by the COS oxidation reaction are harnessed to enhance the productivity of the well by creating fractures in the treatment zone and by melting of paraffin and resin deposits in the treatment zone. As a final step, acid is injected into the formation to react with the formation thereby further enhancing the porosity of the fractures. In one embodiment, the COS uses ammonium nitrate as the oxidizer, and in another, urea or ethylene glycol may be added as a reaction fuel.

主权项

1. A method of treating a near-wellbore formation zone of a geological reservoir comprising the following steps:
a. delivering a mixture of granular magnesium and catalyst to a desired treatment area within the near-wellbore formation zone; b. delivering a combustive-oxidizing solution (COS) to the desired treatment area, the COS capable of reacting with the magnesium; c. permitting the COS to react with the magnesium and the catalyst in the treatment area to increase the temperature and initiate an exothermic oxidation reaction of the COS, whereby the COS is decomposed without an explosion due to the catalyst and the catalyst reduces the temperature required to initiate the exothermic oxidation reaction of the COS to produce COS oxidation reaction gases and heat; d. creating a localized zone of high pressure and high temperature in the treatment area from the COS oxidation reaction gases and heat; and e. creating newly-formed fractures in the treatment area of the near-wellbore formation with the pressure resulting from the COS oxidation reaction gases.