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Abstract Hundreds of horizontal and deviated cluster wells will be drilled in Halfaya oil field. Placing a nearly 3900 meter long and slim column of cement slurry along 7" production casing/liner in 8 1/2" hole proves to be a great challenge operation done on these wells. The long cement isolation interval translates into large temperature differences between the bottom hole and the top of cement with high circulating pressure during cementing job. In this case, the temperature difference can reach to 60∼70°C and Max. Inclination range is nearly 90 degree. On the other hand, the complicated geological conditions such as: abnormally high pressure (Max. PFP: 2.15g/cm) with gypsum/salt zones, potential fractured losses and the presence of H2S, CO2 and high salinity aquifer etc. have also brought great difficulties for cementing. So, all these factors results in poor cementing quality in existing wells. This paper focuses on how we developed a new and high performance cement formulation and supporting technologies to effectively solve the cementing difficulties in this oilfield. The new developed cement slurry with density range from 1.30g/cm to 1.90g/cm has gotten high performance like leak resistance, good rheology ability and especially has good early strength development at the top of cement column. This technology can ensure the cement sets uniformly along the long column and ensure proper zonal isolation. Up to now, 12 wells cementing job have been conducted successfully, 95% of the CBL/VDL well logs show excellent cementing bonding quality. This paper discuss the details of a properly designed cement system and cementing operation and show field implementation result as kind of reference to the future similar cementing cases.
- Geology > Mineral (0.48)
- Geology > Rock Type > Sedimentary Rock (0.47)
- Asia > Middle East > Kuwait > Jahra Governorate > Arabian Basin > Widyan Basin > Lower Fars Formation (0.99)
- Asia > Middle East > Iraq > Maysan Governorate > Arabian Basin > Widyan Basin > Mesopotamian Basin > Halfaya Field > Mishrif Formation (0.99)
- Asia > Middle East > Iraq > Basra Governorate > Arabian Basin > Widyan Basin > Mesopotamian Basin > West Quma Field > Yamama Formation (0.93)
Integrated Formation Evaluation for Cretaceous Carbonate Khasib II of AD Oilfield, Iraq
Zhao, Limin (RIPED, Petrochina) | Liu, He (RIPED, Petrochina) | Guo, Rui (RIPED, Petrochina) | Feng, Mingsheng (RIPED, Petrochina) | Zhang, Zhaowu (RIPED, Petrochina) | Zhang, Yaowen (PetroChina Co. Ltd. Beijing) | Wang, Jun (PetroChina Co. Ltd. Beijing)
Abstract AD oilfield is located in the southeast of Iraq and structurally it is a long axis gentle anticline in Mesoptamian foredeep. This oilfield is in the development planning stage. The accurate formation evaluation plays an important role in making development strategy. In this paper, integrated evaluations of major target formation, Cretaceous carbonate Khasib II were introduced with the combinations of available data. Khasib II was mainly deposited within marine carbonate platform shoals and distributed stably in the full field with an average thickness of 40m. Based on the core data, four rock types are defined. Upwards lithology varies from planktonic foram micritc wackestone through green algae packstone to bioclastic and calcarenite grainstone. The porosities are almost same, about 25% while permeability varies in a large range for different lithology. Lower Khasib II planktonic foram limestone has no more than 1mD in permeability and no higher than 1ohm.m in resistivity while Upper Khasib II limestones have 10mD in average permeability and high resistivity. Reservoir spaces are mainly pores and vugs while fractures are not developed. Pore types are mainly intragranular pores, intergranular pores and intercrystal pores. Two throat types, the tubular throat and the lamellar throat are identified which are the major control factors for leading to the difference of permeability in lower and upper Khasib II. Test results show that lower planktonic foram limestone is dry and upper limestones produce oil which can be inferred that the low resistivity for lower Khasib II is resulted from the lithology rather than water. Reservoir distribution, petrophysical properties and fluid distribution for upper Khasib II are analyzed.
- Asia > Middle East > Kuwait > Arabian Basin > Widyan Basin > Mesopotamian Basin (0.99)
- Asia > Middle East > Iraq > Basra Governorate > Arabian Basin > Widyan Basin > Mesopotamian Basin > Khasib Formation (0.99)
Vane Pump-Another Promising Artificial Lift Form?
Wang, Tongbin (Riped, Petrochina) | Shen, Zejun (Riped, Petrochina) | Pei, Xiaohan (Riped, Petrochina) | Hao, Zhongxian (Riped, Petrochina) | Zhang, Lixin (Riped, Petrochina) | Wang, Quanbin (Riped, Petrochina) | Liu, He (Riped, Petrochina) | Qian, Jie (Riped, Petrochina)
Abstract In thermal production well, beam pumping lifting is still the major artificial lift form in spite of its high cost on surface equipments and huge energy consumption. In conventional progressive cavity pump (PCP), the interior stator is made of synthetic elastomer, the steam temperature is too high for it to work. For the lift in high-temperature wells, in a long time, we did not have a good solution that can balance both mechanical efficiency and high temperature resistance. We developed a new lift manner by using vane pump as the down-hole pump to lift oil to the surface. According to the down-hole conditions, we redesigned the structure of vane pump with small radial size and transporting fluids axially. As same as PCP, the vane pump lift system and its rotor is driven by a surface drive head through the rotating rod strings. There is no initial tightness between the rotor and the stator of the vane pump that are all made up of metal elements. It can resist the temperature of 250 °C and be used in high oil-gas ratio well and heavy oil well. The vane pump's flow rate is about 5 to 100 cubic meters per day, and the pressure rating can reach 20MPa. The vane pumps have been deployed in five steam flooding wells. Compared with the beam pumping unit with the similiar liquid-producing capacity, the energy consumption of vane pump is 30 percent lower. Until now, the longest operation time span is 11 mouths, and all pumps are in good condition. Maybe in the near future, vane pump lift system will become another important artificial lift form. In this paper we will discuss the design of vane pump and its artificial lift system, its benefits and case histories in details. Key words: Artificial lift, vane pump, multiple-stage vane pump, thermal production well
- Europe > United Kingdom > North Sea > Central North Sea > Central Graben > Greater Stella Area > Block 30/6a > Stella Field > Stella Ekofisk Formation > A2 Well (0.99)
- Europe > United Kingdom > North Sea > Central North Sea > Central Graben > Greater Stella Area > Block 30/6a > Stella Field > Stella Andrew Formation > A2 Well (0.99)
- Europe > United Kingdom > North Sea > Central North Sea > Central Graben > Greater Stella Area > Block 30/6-2 > Stella Field > Stella Ekofisk Formation > A2 Well (0.99)
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