METHOD FOR THE COMBINED HYDROGEN AND THERMOBARO CHEMICAL TREATMENT ("TBC-EHR") OF THE NEAR-WELLBORE REGION OF A PRODUCING FORMATION
The invention relates to the oil extraction industry and can be used in the development of hard-to-recover reserves of oil, gas and natural gas condensate in low-permeability, low-porosity, tight reservoirs. According to the present method, prior to injection of a first mixture of a combustible oxid...
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Zusammenfassung: | The invention relates to the oil extraction industry and can be used in the development of hard-to-recover reserves of oil, gas and natural gas condensate in low-permeability, low-porosity, tight reservoirs. According to the present method, prior to injection of a first mixture of a combustible oxidizing composition (COC) and a water-reactive composition (WRC), the lower end of a production string is positioned at the level of upper perforation holes and an organic solvent acting as a buffer is delivered to the perforated interval. After injection of the first COC/WRC mixture, the well annulus is closed and the mixture is driven directly into the near-wellbore region of the producing formation using a kill fluid, the volume of which is equal to the volume of the first COC/WRC mixture. After that, an organic solvent acting as a buffer and a second COC/WRC mixture are injected in succession. Next, the well annulus is closed and the second COC/WRC mixture is driven directly into the near-wellbore region of the producing formation using a kill fluid, the volume of which is greater than the volume of the second COC/WRC mixture. The result is an increase in permeability and additional inflow and a reduction in the viscosity of the well fluids as a result of the formation of additional microfractures and an increase in the length of the perforation channels, thus allowing an improvement in the filtration properties of the formation.
L'invention se rapporte à l'industrie d'extraction du pétrole et peut être utilisée lors de l'exploitation de réserves de pétrole, de gaz et de condensat de gaz difficiles à extraire dans des collecteurs à faible perméabilité, faible porosité et denses. Selon le procédé, avant de pomper un premier mélange de compositions pour SPG et SRG, l'extrémité inférieure d'un tube de pompage-compression (TPC) est disposée au niveau des ouvertures supérieures du forage et on envoie dans l'intervalle de forage un solvant organique jouant le rôle de tampon. Après le pompage du premier mélange de compositions pour SPG et SRG, on obture l'espace tubulaire et on procède à sa compression immédiatement dans la zone de forage de la couche productrice avec un liquide d'obturation de puits dont le volume est égal au volume du premier mélange des compositions de SPG et SRG. Ensuite, on pompe séquentiellement un solvant organique jouant le rôle de tampon et un second mélange de compositions SPG et SRG. On obture ensuite l'espace tubulaire et on effectue une |
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