New temporary blocking Workover technology in Changqing oilfield

• As of March 9, the Changqing oilfield Technology Research Institute developed low-voltage low-damage of temporary blocking Workover technology in gas well, in sulige gas field of 18 wells were a temporary success, fast production test wells, yield stability and rising.
  The sulige gas field of Changqing oilfield development, gas wells in sandstone reservoir of SG has reached more than 7,000 more than, more than 70% gas double packer or Packers more pipe string. As the gas field recovery level increases, the pressure decreases, and snubbing, it is difficult to solve this type of gas pipe blockage, deformation, check the perforations caused by Workover problems. Pressure coefficient is lower than 0.9 per cent of the gas well in the conventional prevailing brine fluid into the fluid loss of production capacity, production difficulties and problems.
  For these problem, technicians in full research both at home and abroad temporarily blocking technology of based Shang, combines oilfield actual, clear has "temporarily blocking across water, and fast complex produced" of research ideas, innovation proposed "low concentration anti-expanded segment plug + temporarily blocking liquid segment plug" of double slug temporarily blocking pressure wells liquid system, that used low concentration anti-expanded segment plug reduced water lock hurt, used temporarily blocking liquid segment plug in shot hole segment near formed temporarily blocking layer, reduced upper pressure wells liquid to formation of leakage. After 3 years of continued research, technicians filter has more than 20 over species high sucking water material, while supporting has high strength short fiber, and raised agent, and protection agent, enhanced stable, eventually success development has low cost temporarily blocking pressure wells liquid system, formed has for 3 species repair wells type of temporarily blocking process, achieved has "Note have into, and blocking have live, and row obtained, and low hurt" of target.
  For general repair wells liquid water lock, storage layer hurt problem, technicians development has low voltage wells low hurt temporarily blocking pressure wells liquid system, liquidity good, easy returned to row, storage layer hurt rate low, effective solution has repair wells process of storage layer protection problem, single wells temporarily blocking pressure wells liquid cost more original system reduced 70%; supporting development pressure wells liquid with sucking water resin and efficient clay stable agent, design has fast disassembly type distribution liquid tank, through site application, sharply upgrade has job efficiency and temporarily blocking effect. For replaced tubing, and salvage bridge Plug and fill shot new layer, repair wells in the exists of problem, research formed has new of 3 species storage layer temporarily blocking process, and General pressure wells process compared to, into to liquid volume reduced 50%, job time shortened 10 days; research formed of negative pressure row liquid method, achieved has job wells fast row liquid, complex produced time shortened 6 days, effective improve job efficiency and security, reduced has storage layer hurt.
  Low damage low pressure gas well of temporary blocking Workover technology successfully applied, not only solved the low pressure gas well Workover fluid production and reservoir protection in the process of problem, increased job security, low process costs and avoided homework well and yield effect of water locking injury, an increase of 36 million cubic meters of the gas, significant economic benefits.
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