Research And Application On Water Search And Shutoff Of Naiman Oilfield

Naiman oilfield is a secondary negative tectonic units kailu basin southwest side, the main purpose of the oil layer is Jiufotang, are structural- lithological reservoirs. Jiufotang reservoirs are mainly low porosity and low permeability reservoir low- especially local development in the hole, with the diffusion layer. However, due to poor reservoir properties, a serious shortage of natural energy, the lower one-time recovery, the need to replenish energy development through the water, in order to improve ultimate recovery of oil. Due to the impact of reservoir properties, the field is not no oil fracturing. Crack fracture generated a tremendous impact on the water, along the direction of the crack-prone water channeling, flooding and other phenomena, if not effectively govern, oil displacement efficiency will continue to decline, stable oil difficult.Text mainly through the development of methods and geological conditions Neyman field of research and analysis, application technology research by looking for water, determine the water layers. Selective blocking agent to determine the type and optimize selective blocking agent of the formula. Selective blocking agent is mainly composed of zwitterionic polyacrylamide(CPAM), a crosslinking agent, phenol and organic modifier four kinds of material. Crosslinkers slow heat release formaldehyde, phenol formaldehyde condensation and organic, its condensation products with CPAM crosslinked to form a gel-type blocking agent. By CPAM, crosslinking agents, gel-type organic phenol blocking agent is CPAM- three materials prepared phenolic resin as the main component of the composite gel, in addition, there are some organic hydroxymethyl phenol, methylene group CPAM condensate such as plastic. We can see from the above reaction mechanism: Formaldehyde is released slowly heated cross-linking agent, extending the crosslinking time system is conducive to high-dose treatment, gel-type blocking agent is introduced into the network structure of aromatic rings, improved thermal stability sex.Indoor core simulation experiments show that the selective blocking agent has a certain ability to selectively enter in a certain formation permeability contrast, the right to select the recipe blocking agent can achieve the effect of selective water shutoff. Visual simulation experiments show that the selective blocking agent when the main water shutoff general into the high permeability zones, effective control of the bottom water channels, improve sweep efficiency.