Co Flooding Lifting Technology in Oil Well with High Gas-Oil Ratio in Low Permeability Oilfield

2013 ◽  
Author(s):  
Feng Wang ◽  
Ruo Sheng Pan ◽  
Dongmei Ma ◽  
Yingan Zhang ◽  
Guojun Yin
Keyword(s):  
Low Permeability ◽  
Oil Well ◽  
Gas Oil

ASSESSMENT OF OIL WELL PRODUCTIVITY IN LOW-PERMEABILITY RESERVOIRS IN THE FIELDS OF EASTERN SIBERIA

2017 ◽  
pp. 30-36
Author(s):  
R. V. Urvantsev ◽  
S. E. Cheban
Keyword(s):  
Oil Recovery ◽  
Large Scale ◽  
Oil And Gas ◽  
Oil Extraction ◽  
Low Permeability ◽  
Oil Well ◽  
Eastern Siberia ◽  
Development Costs ◽  
Traditional Fields ◽  
Low Permeability Reservoirs

The 21st century witnessed the development of the oil extraction industry in Russia due to the intensifica- tion of its production at the existing traditional fields of Western Siberia, the Volga region and other oil-extracting regions, and due discovering new oil and gas provinces. At that time the path to the development of fields in Eastern Siberia was already paved. The large-scale discoveries of a number of fields made here in the 70s-80s of the 20th century are only being developed now. The process of development itself is rather slow in view of a number of reasons. Create a problem of high cost value of oil extraction in the region. One of the major tasks is obtaining the maximum oil recovery factor while reducing the development costs. The carbonate layer lying within the Katangsky suite is low-permeability, and its inventories are categorised as hard to recover. Now, the object is at a stage of trial development,which foregrounds researches on selecting the effective methods of oil extraction.

The Application of Dynamic Development Data in Low-Permeability Reservoir Water Flooded Layer Identification

2015 ◽  
Vol 733 ◽  
pp. 148-151 ◽  
Author(s):  
Mei Ling Zhang ◽  
Fei Guo ◽  
Jian Hua Lin
Keyword(s):  
Analysis Data ◽  
Identification Accuracy ◽  
Water Flooding ◽  
Low Permeability ◽  
Oil Well ◽  
Reservoir Water ◽  
Low Permeability Reservoir ◽  
Development Data ◽  
Single Well ◽  
Sand Bodies

Due to the influence of the environment of measurement and complex pore structure in low-permeability reservoir, we use single-well logging data alone to discriminate the degree of reservoir flooded has multiple solutions. In the water flooding procedures, water well and oil well have formed a dynamic developing unit. And with the water propelling, some sand bodies were flooded by water before the well was drilled. The dynamic information of developed wells in connected sand bodies (such as moisture rate and minimum layer water absorption profile, etc.), can reflect the level of water-flooded in some degree. This paper construct the rules of distinguishing the water flooded layer by dynamic analysis data on the basic of dynamic developing unit, which has prolonged the identification accuracy of water flooded layer degree of low-permeability reservoir efficiently.

scholarly journals Productivity Prediction Model of Vertical Artificial Fracture Well and Analysis of Influence Factor in Low Permeability Reservoir

2015 ◽  
Vol 8 (1) ◽  
pp. 420-426 ◽  
Author(s):  
Chengli Zhang ◽  
Dezhi Liang ◽  
Daiyin Yin ◽  
Guoliang Song
Keyword(s):  
Numerical Simulation ◽  
Pressure Gradient ◽  
Influence Factor ◽  
Low Permeability ◽  
Oil Well ◽  
Low Permeability Reservoir ◽  
Fracture Length ◽  
Capacity Model ◽  
Start Up ◽  
Artificial Fracture

Based on the analysis of seepage mechanism of fracturing wells in low permeability reservoir, this paper establishes the capacity model of the vertical fractured well production under the factors of Start-up pressure gradient, pressure sensitive effect and the artificial fracture length. The numerical simulation is compiled and software calculates the capacity model by using numerical simulation. This simulation technique verifies the validity of the model and numerical method. On this basis, we study the influence of the included angle of artificial fracture and well array direction, artificial fracture length, start-up pressure gradient and production pressure difference to the capacity of the oil well.

Structural Design for Oil Well Pump with Soft Sealing and Small Diameter Piston

2013 ◽  
Vol 655-657 ◽  
pp. 359-364
Author(s):  
Wen Hui Yan ◽  
Ping Gao ◽  
Yong Chen
Keyword(s):  
Small Diameter ◽  
Control Technique ◽  
Low Permeability ◽  
Oil Well ◽  
Working Process ◽  
Daily Production ◽  
Maintenance Cycle ◽  
Sealing Ring ◽  
Soft Seal ◽  
Selection Of

For the low pumping demand of daily production per well of low permeability oilfield, a diameter of 25mm soft sealing small diameter piston-type subsurface pump is designed, and an external traveling valve to ensure that the valve still application of standard parts is adopted, while reducing the pump barrel diameter. In order to solve the problems of pump leakage increasing with wear, automatically compensate for soft seal ring is adopted in piston design. The liquid pressure of the pump barrel is changed in the pump working process, so that the sealing ring is deformed outwardly. When the pump reaches the upper stroke, the gap between the pump barrel and the piston reduced, and further improve the sealing effect. The innovation of structure and the selection of new materials can reduce the difficulty of pump processing, as well as can extend the maintenance cycle. This paper introduces the overall structure and sealing characteristics of soft sealing small diameter piston-type subsurface pump. If the soft sealing small diameter piston-type subsurface pump and real-time variable frequence control technique of pumping unit combined, a more reasonable machine rod pump combination can be provided to achieve ultra-low permeability oilfield stripped well efficiently pumping.

Study on the Production Decline Laws for Vertical Fracture Well in Low-Permeability Gas Reservoirs

2014 ◽  
Vol 527 ◽  
pp. 81-87
Author(s):  
Yi Ning Wang ◽  
Xiao Dong Wu ◽  
Rui He Wang ◽  
Feng Peng Lai ◽  
Bei Lin Qi ◽  
...  
Keyword(s):  
Superposition Principle ◽  
Stable State ◽  
Asymmetry Factor ◽  
Low Permeability ◽  
Oil Well ◽  
Gas Reservoirs ◽  
Well Productivity ◽  
Vertical Fracture ◽  
Fracture Length ◽  
Well Production

The vertical fracture was asymmetrical about the wellbore or two wings of a fracture are not certainly in a line for the complex geo-stress in the possession of fracturing of the gas reservoirs. In view of the low permeability reservoir after fracturing developing the asymmetrical vertical fracture and non-coplanar fractures, based on the non-steady seepage theory, using the potential function theory, superimposition principle and numerical analysis method, a performance prediction model for the vertical fracture in low-permeability gas reservoirs was deduced with pressure drop superposition principle. The production decline laws were analyzed by practical cases. The result shows that the initial production of the vertical fracture is relatively high but soon followed by a sharp decline. Then, the production keeps in a relatively stable state and declines slowly in the middle and later. The fracture asymmetry factor has little effect on the gas well productivity. The non-coplanar angles have greater effect on the oil well productivity in the initial stage. The more the fracture length and the bigger the flow conductivity, the higher the oil well production and the faster the decline rate will be. However, the increase amplitude will be getting smaller and smaller along with the fracture length and flow conductivity.

Research on Protecting Formation Low-Damage Workover Fluid in Low Permeability Reservoir

2019 ◽  
Vol 18 (06) ◽  
pp. 1850049
Author(s):  
Zhang Hanshi ◽  
Jiang Guancheng ◽  
Bi Hongxun ◽  
Zhu Kuanliang
Keyword(s):  
Treatment Process ◽  
Field Application ◽  
Low Permeability ◽  
Oil Well ◽  
Water Sensitivity ◽  
Flow Test ◽  
Evaluation Test ◽  
Water Blocking ◽  
Actual Field ◽  
Low Permeability Reservoirs

During the workover treatment process, poorly compatible workover fluids infiltrating into reservoir could cause serious formation damage. To tackle the aformentioned issues, in this work, low-damage workover fluid was systematically studied. By investigating reservoir damage mechanisms, chemical property study, compatibility evaluation test and core flow test, we obtain three kinds of workover fluids suitable for different blocks in Nanpu oilfield. Attractively, JRYL workover fluid which contains antiswelling agents can effectively prevent water sensitivity, and the permeability recovery values of JRYL workover fluid to NP1-5 and PG2 core are 95.3% and 86.9%, respectively. JRYD workover fluid which contains antiswelling agents and anti-waterblocking agent can prevent both water sensitivity and water blocking damage, and the permeability recovery value of JRYD workover fluid to NP403X1 core is 89.4%. JRYJ workover fluid suitable for high pressure formation can prevent water sensitivity and water blocking damage, and the permeability recovery value of the JRYJ workover fluid to NP403X1 core is 95.1%. The actual field application in Nanpu oilfield indicates that these workover fluids can not only reduce the oil well recovery time after workover treatment, but also increase production recovery rate. These results display great potential to efficiently develop low permeability reservoirs.

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