Deep Well Ultra Deep Shaft Electric Pumping Technology in Tarim Oilfield

Keywords: Pumping deep well ultra-deep well application 1 Overview Tarim oil field buried depth of 3 500m ~ 6 000m, formation temperature of 100 ~ 146 ℃, loose and prone to sand reservoir and CO2 and other corrosive media, which determines the characteristics of the choice of high Head, high temperature level and sand-resistant pump. Since December 9, 1991 in Lunnan Oil Field LN2-3-4 wells after the successful pump test, gradually increasing the electric pump production efforts. The unique series of electric submersible pump production technology has been formed in Tarim Oilfield. 2 ordinary electric pump production technology Tarim Oilfield electric submersible pump unit has the following characteristics: Displacement range: from 50m3 / d ~ 600m3 / d; head high: displacement head 1 500m ~ 3 500m; high temperature resistance: resistance Temperature level 120 ℃, 150 ℃. 3 sand anti-corrosion pump technology In 2001, the East River oil wells serious sand, corrosion. Ordinary pump can not meet the sand, corrosion of the bad conditions. Pump caused by pump, serious corrosion, frequent damage. Seriously affected the normal production. Tarim Oilfield Development Division of Donghe Oilfield sand corrosion and disintegration of a number of sets of sand card unit in-depth study, and electric pump manufacturers joint research, developed for the East River oil sand resistance corrosion pump. 3.1 Sand-Resistant Design 3.1.1 Designing Carbide Bearings Several hard bearings are designed between the pump ends and at the guide vanes at regular intervals. Bearing, the outer ring is a new type of high wear-resistant materials, the outer surface of the outer sleeve with a plastic o-ring, bearing, inner ring, outer ring, "O" ring and other combinations to form a rigid plastic bearings. Hard bearing high hardness (1250HV), the radial clearance decreases, even if the sand (800HV) into the friction pair, it will not wear. 3.2.2 Design a new structure of the impeller (1) Remove the impeller seal ring friction parts, reducing the sand card occurred to improve the efficiency of the pump. (2) The design of the housing of the guide shell allows the well fluid to smoothly enter the impeller and reduce the deposition of sand. Avoid sand into the guide vane friction pair. This structure can reduce the radial wear of the guide vane wheel hub. (3) Selection of new impeller wear-resistant material gasket, extend the life of thrust washer and guide vane. (4) In-pump thrust ring structure In high lift, axial well bearing a large well condition, inlay thrust ring structure can withstand the axial force of each impeller and pump shaft, both to achieve radial righting, But also to achieve axial unloading, reduce bearing pressure bearing pressure bearing. (5) Inlet joints of hard alloy and sand-resistant refill with submersible pump installed on the upper and lower joints of the pump are equipped with sand-control carbide core and sleeve of carbide to reach the upper and lower shaft head, and improve the pump and separator and protector Coupling accuracy, to ensure the reliable operation of submersible pumps. (6) to improve the pump head, pump pump structure designed to use special external hexagonal bolts to improve the pump head, pump seat structure, connecting bolts double, increase the wall thickness of the pump seat. This increase the strength of the connection between the various components, to prevent the bolts caused by vibration loosening, fatigue fracture or shear damage caused by the crew fell. (7) design of sand protection protector In the actual use of the process, the first mechanical seal in direct contact with the well fluid, the first mechanical seal of the movable and static ring material graphite and ceramics to cemented carbide ( Tungsten carbide), greatly improving the protection of the first level of mechanical seal sand resistance. (8) design Sand separator By analyzing the key vulnerable points, the separator under the joint, the separation shell, diversion shell three bearing parts, the choice of hard wear-resistant material bearings, played a sand control wear. 3.2 anti-corrosion treatment 3.2.1 The appearance of the unit with nickel-phosphorus alloy coating after spraying temperature 200 ℃ anti-corrosion coating. 3.2.2 Submersible pumps, protectors, separators, motor joints using stainless steel or nickel-phosphorus alloy surface layer, and then spray 200 ℃ corrosion-resistant coating. 3.2.3 submersible pumps, separator shell surface using nickel-phosphorus alloy layer. 3.2.4 cable armor made of stainless steel. 3.2.5 cable shield stainless steel. 3.2.6 Connection bolts 12.9 stainless steel. 3.2.7 Each connection spline sleeve using Monel material. 3.2.8 cable head shell coated with anti-corrosion coating. 3.2.9 single-flow valve, drain valve made of stainless steel or nickel-phosphorus alloy surface layer. 4 submersible pump supporting technology 4.1 Development of well selection pump software In 2000, Tarim Oil Exploration and Production Research Institute based on the actual situation of the Tarim Oilfield, developed a pump selected well pump software. The software provides a scientific basis for well selection and optimization of electric pump wells. 4.2 Automatic Pump Monitoring Technology (RTU Technology) It can be in the joint control center within the center of the station, 24 hours a day continuous monitoring of pump wells wellhead hydraulic pressure, nesting, temperature signal, and pump status signal, the pump operating current , Operating voltage, and in the emergency room control center remote stop pump function. 4.3 Inverter control technology In order to adjust the output of electric pump well and the purpose of new drilling and measure well for production, the inverter was introduced into field test in HD1-8H well in 2003. The downhole pump is a 50m3 / d-2500m electric pump, the inverter adjusts the frequency range of 40.3 ~ 53HZ, electric pump displacement adjustment range of 29 ~ 79t / d. Test results are good. 4.4 Application of electric pump two-stage separator Currently electric pump supporting rotary separator, gas-liquid separation effect of 30% (gas-liquid volume ratio), can not be used in high gas oil than the well. Pump double stage separator, can improve the gas-liquid separation effect (10 ~ 20%), to solve the pump in the high gas oil than the well to smooth operation. 4.5 Application of electric pump shroud For the ancient oil field in the Lun Gu oil pump thin oil injection heavy oil recovery. Application of electric pump shroud technology to solve the problem in the oil well pump motor cooling. 4.6 Sand Control Machinery Sand Control In view of the increasing exasperation of electric pump well sand, mechanical sand control experiment has been carried out in some electric pump wells in Donghe Oilfield since 1999. The process is characterized in that a hanger is used to set the sand control tube in the middle of the oil well or hang on the tail of the motor so as to prevent sand from entering the pump body and tubing and improve the operating environment of the pump unit to prolong the service life of the pump unit . 4.7 CJ-6 deep well surface tester In 1997 December and Jinggangshan plant cooperation developed CJ-6 (3000m) deep well surface tester, the instrument reliability, high sensitivity, accurate test, with the test 3000 m above the level of performance. Successfully solved the Tarim Oilfield ultra-deep plane mining surface monitoring. 4.8 pump electronic pressure gauge pressure measurement technology In 1996 the United States imported GRC underground permanent electronic pressure gauge. In 1997 July LN10 wells in the use of electronic pressure gauge its own cable hanging to the middle of the reservoir, carried out the first case of underground pump pressure gauge monitoring test. After the improvement, solves the mutual interference between the electric pump power cable and the pressure gauge cable current, accurately obtains the formation temperature and the pressure. This technology has successfully solved the problem of direct formation pressure measurement under the electric pump well pump. 4.9 Capillary Manometry Technology 94 - 95 The introduction of capillary pressure measurement system from the United States (PRUETT) company in the installation and use, by comparison, the pressure measured by the capillary pressure measurement system pressure gauge and the pressure gauge less deviation. Pump inlet pressure pump to solve the pump well pressure monitoring problems, and can be measured continuously underground pressure. 4.10 DPT Pressure Measurement Technology DPT underground electronic pressure gauge is a long-term high temperature and pressure in the environment stable working electronic equipment, directly linked to the pump, can accurately record down to 3 years of high precision downhole pressure and temperature data, the East River Oilfield electric pump wells using DPT pressure measurement technology to obtain the underground static and dynamic pressure data, to optimize the control of production pressure, the electric pump well mining more reasonable, try to avoid or reduce the formation of sand. 5 Tarim Oilfield pump management technology 5.1 pump quality control Strict pump procurement contract, due to the quality of electric pump operation less than 400 days, do not pay the unit costs, and deduct operating costs 100,000 yuan. At the same time increase incentives, electric pump operation on the basis of 400 days for each additional 100 days, reward pump 10%, up to 140% of unit costs. Pump quality problems occur two times to stop service for more than 1 year. 5.2 Optimized well selection pump work Using the pump design software developed by the Institute of the entire field of electric pump wells to re-verify the next electric pump wells to provide a reliable scientific basis. For new transfer pump wells, through the pump design software for scientific election well pump. 5.3 Strengthen the management of construction operations According to Tarim Electric pump technical management standards, starting from the five aspects of electric pump matching, testing, on-site operation, overhaul and fault judgment, strict control on unit matching, unit quality, construction quality and fault diagnosis and treatment is carried out to ensure Electric pump unit put into operation successfully and smoothly. 5.4 & nbsp;

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