Study On Comprehensive Control Of Water Injection Failure Well In Ordovician Oil Reservoir In Tahe Oilfield

With the scale enlargement of tahe oilfield development and the increase of recovery degree, formation energy falling, especially in tahe area and twelve just area of in-depth development, expanding scale of single well water injection, increasing water injection rounds, crude oil recovery degree increase near wellbore area, part of the water injection well effect gradually becomes poor, currently has165water injection for the well failure. Unit water injection development for water injection for a long time also lead to some unit effect shall become null and void variation, appear even water channeling, ending in2012has13well group has accumulated failure. Water injection development effect variation led to the rapid decline of oil Wells, restricts the oilfield efficient development process, so research on comprehensive governance failure Wells water injection is particularly important.This paper first analyzed from water injection for oil well production characteristics, study waterflood failure cause and the reservoir model, failure reasons of the ordovician carbonate reservoir water flooding has carried on the detailed analysis and summary, the content including failure reason analysis and unit for oil filling failure reason analysis. Then through consulting a large number of documents, combined with the feature of carbonate reservoir geological characteristics and development, puts forward corresponding countermeasures on water injection failure Wells. For water injection for oil well failure of governance methods mainly include acid defuse plugging, gas injection production, Chemical degreasing, and turn to try the unit4kinds, such as water injection unit for water injection well group governance method main failure are adjusted for asymmetric unstable water injection, profile control injection water, chemical displacement and periodic whole whole change the fluid field of mining, large pump in oil and gas injection for six. In the process of making countermeasures, we conducted a series of field test, the CRS surfactant field test in2Wells, Apollo enzyme profile field test4Wells, the water injection test in2Wells and asymmetric eight unstable water injection well group, test success rate of75%.This subject system of the tahe carbonate fractured-vuggy reservoir waterflood failure Wells are analyzed, the reason of failure is summarized four types of failure causes and set up effective measures. System is demonstrated for the first time the tahe carbonate fractured-vuggy reservoir waterflood expires feasibility for oil, gas injection effect evaluation experiment, established the principle of selecting well, and unit of gas injection development countermeasures are put forward. And evaluation of the tahe carbonate fractured-vuggy reservoir unit failure after water injection profile control water plugging, Apollo biological enzyme, the governance effect of CRS surfactants, established the principle of selecting well, and based on the hydrodynamics of asymmetric unstable water injection injection-production method and periodic whole note whole mining field test, and the evaluation of the effect.