Method of oilfield development

Details Method of oilfield development Method of oilfield development

E - Fixed Constructions

21

B

E21B 43/38 (2006.01)

Patent

CA 2286245

The invention is referred to the oil industry and namely to methods of oilfield development through waterflood and aims at lowering the costs and raising ecological benefits of methods of near well bore area cleanup from plugging particles through their dispersion and dissolving by the impact of ultrasound in the active liquid media until the deposits turn into a thinly dispersed hydrophobic suspension with the dimensions of solid particles within 0.5-20 µm with further injection of formed suspension into the reservoir to level out injectivity profile and decrease water inflow in producing wells. Active liquid with surface tension on the vapor contact within 20-35 mPa-sec-1 (erg/cm2), density exceeding flood water density by no less that 100 kg/m3 and viscosity equal to water phase viscosity or exceeding it by no more than 20 times is use. The optimum parameters of ultrasound impact are selected based on the results of prior laboratory testing of ultrasound dispersed sediment that was collected form the near well bore area. The testing is performed in various active liquids that provides a thinly dispersed hydrophobic suspension with the dimensions of particles within 0.5- 20 µm. Treating the near well bore area of wells with little sediment or wells that were previously cleaned from sediment through other methods to form thinly dispersed hydrophobic suspension in the near well bore area for its later use to block highly permeable reservoir intervals in place of active liquid media a dispersion of petroleum sludge-waste is injected into the well. The sludge is previously blended with the active liquid media, volume ratio being between 1:10 and 1:5 depending on the content of solid phase in the sludge.

Cette invention se rapporte au domaine de l'industrie pétrolière et concerne notamment des procédés d'exploitation de gisements pétroliers qui permettent de maintenir la pression de la couche selon une technique d'inondation. Cette invention permet de réduire les coûts et d'accroître les caractéristiques de respect de l'environnement des procédés de nettoyage de la zone voisine du fond du puits depuis les couches colmatantes de sédiments. Les sédiments sont dispersés et dissous par ultrasons dans un milieu liquide actif jusqu'à ce qu'ils se transforment en une suspension hydrophobe à dispersion fine dont les particules solides ont une taille de 0,5 à 20 mu m. La suspension ainsi obtenue est pompée dans la couche de manière à équilibrer le profil d'injectivité des puits d'injection et à réduire les infiltrations d'eau dans les puits d'extraction. On utilise en qualité de liquide actif un liquide dont la tension de surface à la limite de la vapeur varie de 20 à 35 mPa.sec<-1> (erg/cm<2>). La densité de ce liquide est supérieure d'au moins 100 kg/m<3> à la densité de l'eau du système d'inondation, tandis que sa viscosité est égale à la viscosité de la phase aqueuse ou est 20 fois supérieure à celle-ci au maximum. Lors de l'exploitation d'un puits où la formation de dépôts est faible, le liquide actif est préalablement mélangé à des déchets pétroliers de déblaiement selon un rapport volumétrique de 1:10 à 1:5.

Affiliated with

Also associated with

Rating

Method of oilfield development does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of oilfield development, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of oilfield development will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1645798