Research On Compatibility Of Injection Water And Stratum

Keep the bottom pressure is the key technology to improve the means of oil recovery,water injection into the method to keep the bottom pressure and enhance oil recovery is the most important. At present, with water flooding development of Xinmin oil field after 22 years, with the note well water injection, enough water, fine water injection work unceasingly thorough, the contradiction between water work have become increasingly prominent, as the primary key for the good of the reservoir water injection water injection is urgent. Especially in Xinmin Oilfield by cleaning water mixed injection, compatibility is poor,harm to the reservoir, how to clear water compatibility to harm and improve the water quality of reservoir is the key project of the compatibility problems need to be solved next.On the ground of water recovery after the treatment of crude oil and the mixed sewage decontamination prolapse, mixed injection water injection indexes directly by the clean water and sewage mixed compatibility effect, once the compatibility difference will lead to inject exceed the standard index of water quality, ground systems work effect is reduced, increasing the burden of ground system, at the same time as the transport of the injected water and injection may cause the ground system is affected by corrosion, column pipe underground,increase the ground system was put into operation and downhole operation input, at the same time formation is irreversible damage, the final engineering system inputs increased, oilfield development economic benefits are affected.In the stratum due to compatibility of injected water and formation water will bring harm to the reservoir, causing reservoir spaces are affected, and the irreversibility of the damage, once the reservoir parameter change will reduce reservoir economic development benefit. If the injection will aggravate the reservoir rock properties change in compatibility between water and the rock, eventually leads to lower recovery rate, causing the oil to shorten the development cycle, oil production decline.In order to ultimately improve the economic benefit of oilfield production, maintain the reservoir parameters stability, starting from the core properties of surface water treatment process, gradually to improve the compatibility of the supporting surface of the injected water,compatibility and the rock of water injection, compatibility of water and ground layer water injection study, formation of surface water treatment technology and water injection the process has the characteristic of Xinmin.