Well Testing/Tubing Conveyed Perforating Technology Of Deep Gas Well

Recently, Daqing oil field has continuously developed peripheral and deep zone and researchedperforating technology, well testing string and well testing technology of deep well & ultra deep well. Butwith exploration and production of Daqing Xujiaweizi oil field, deep gas well perforating and well testingoperation has continuously increased. Existing perforating technology and well testing string and welltesting technology of deep well & ultra deep well can't meet the requirement. Therefore, we should developa set of perforating technology and well testing string and well testing technology that are suitable for deepgas well, such as thermal and overpressure resistant perforation equipment, testing hardware, deep gas welltesting string, and so on.Perforating and well testing operation of deep gas well is different from it of other deep wells. Thereasons are:a. Pressure and temperature are high at downhole.b. Well testing string is long and friction resistance from borehole wall is increased.Geothermal gradient in Daqing oilfield is relative high among our country. For example, total depth ofPushen 1 is 5200m, bottom hole temperature is up to 219℃, average geothermal gradient is 3.98℃/m.Because of friction resistance effect and temperature effect, intensity-requirement to operation stringbecomes higher and higher. Technical description is high for gunpowder temperature of perforating andequipment & instrument of well testing. At the same time, deep gas well of Daqing have some uniquefeathers, such as deep, hypothermic, high pressure, productive, low permeable, leaky after fracturing, andso on. So, there are many technical problems need to be solved in perforating and well testing of deep gaswell: existing MFE tool, packer, seal packing element and pressure gauge can't meet the well testingrequirement of 4000～5000m, 140℃, 35MPa (pressure difference) deep well. Well testing, packing, wellkilling and data measuring are all difficult. It becomes "bottle neck" of deep gas well testing. The technicalproblems are shown as follows:-Bottom hole cut off and flow/shut in operation are very difficult during MFE test, especially in highproductivity well.-Need fluid cushion to balance packer pressure difference during deep well well testing. It will causebackpressure and affect liquidity judgment.-When well temperature exceeds 140℃, electronic pressure gauge become unsteady to lead to dataabsence and gauge damage.-Well killing technology is imperfect and kin fluid leakage is high.To solve the problems mentioned above, research has been carried on in the theme. The achievementhas been widespread applied to deep gas exploration and production of Daqing oil field, especially inXujiaweizi gas field. Perforating and well testing layers are more than 60 layers per year. It solves theproblem about abnormal high temperature and pressure in deep well &ultra deep well. It ensures operationsecurity and successfully performs perforating and well testing tasks. Significant social and economicbenefits achieved.