Integrated technology of injection-plugging-profile control in Haiwaihe Oilfield
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The technology of integrated injection - plugging - profile control has been proposed for Haiwaihe Oil- field in accordance with the problems occurred during water flooding.With well group as flooding unit,the tech- niques of fracturing and block removing,stratified waterflooding,in- depth profile control,and chemical water plugging for oil and water wells are integrated and optimized to improve recovery factor.Field application has seen good result,daily oil production has sustained over 1 000 t/d for 3 years,thus realizing efficient develop- ment of the oilfield.Keywords:
Water flooding
Injection well
Oil Production
Water cut
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Weigang Oilfield is characterized by many faults and serious reservoir heterogeneity. Therefore, cyclic waterflooding pilot tests were carried out on a well group in the oilfield. The test results show that, cyclic waterflooding can not only decrease water cut, increase crude oil yield, but also improve the vertical liquid production profils of oil wells.
Water cut
Oil well
Pilot test
Oil Production
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The geological reserves of south Gudao Oilfield were 2271.6×104t,it's reservoir characters were multilayer,thin reservoir,fault zones and poor reservoirs,which determined that it was difficult for oilfield management and development.At present,the recovery percent was only 5.3%,recovery ratio was 11.3%,it had a good foundation for tapping the potential.Fine geological research was conducted on Layers Ng5-6 and Ng1+2～4for implementing supporting adjustment techniques,for the highly controlled well pattern of middle Ng5-6 heavy oil layer,a fine evaluation was performed on the heterogeneity of reservoirs and fluids to implement sub-zoning and low efficient waterflooding transferred to thermal recovery,for Ng1+2～4 heavy-oil layer with poor well pattern control and complex structure,structural and reverse reservoir interpretations were carried out to clarify the resources and adjust the strata development for the purpose of raising the oil porduction level of reserves.Improving the development effect and enhancing oil recovery and for effective development of the south Gudao Oilfield.
Fault block
Foundation (evidence)
Lead (geology)
Oil reserves
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In consideration of the problems existed for waterflooding in water injection unit in Shuanghe Oilfield, the adjustment measures for multiple well water injections have been restudied for recent years under the conditions for basically perfecting the water injection and production well patterns, thus the reserves in the waterflooding unit of Shuanghe Oilfield are continuously raised, the production indexes of water cut and production depletion are properly controlled, by which the waterflooding adjustment at the late stage of extra-high water content can be guided in waterflooding oilfields.
Water cut
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Wushi 1-4 heavy oilfield characterizes as high viscosity,thin layer,and complicated relationship of oil and gas and water.In the paper,the reasonably way of developing the gas and oil is analyzed.The incorporated geologic characteristics of the oilfield are analogized with the similar heavy oilfield,the deliverability in this oilfield is analyzed with the data of well test,the oil recovery of steam flooding is calculated,and advisably development schema of the oilfield is presented.
Water flooding
Oil viscosity
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Xia'ermen Oilfield Eh2Ⅱ oil formation was a general heavy oil reservoir with thin oil layer,strong heterogeneity and high oil viscosity.After water injection,polymer flooding and water injection have been used for polymer flooding development for more than 20 years.There was low recovery percent,low production velocity,low producing degree,high water-cut,the effect of development has been worse year by year.It achieved good oilfield application effect by using key techniques,such as well pattern adjustment,injection and production parameter optimization,overall profile control and dynamic adjustment etc.for second polymer flooding.Field application indicates that it can improve development effect of the reservoir,it is an effective way to improve recovery percent of reserves.It is the first unit for second polymer flooding for conventional heavy oil reservoir in Xia'ermen Oilfield.It provides reference for the similar reservoir development.
Water cut
Water flooding
Oil Production
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Under-injection is often seen in low permeability oilfield waterflooding process, and conventional acidizing and fracturing may not be effective. Boosting water injection is an effective way. Qiuling oilfield has received good response after using this method. This is a reference to other similar oilfields.
Boosting
Wellbore
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Field tests have been made on CO2 stimulation,N2 drive,air injection displacement,synthetic polymer flooding,cross-linked polymer flooding and microbial oil recovery successively.Normal tertiary oil recovery isn′t fit for Zhongyuan oilfield with high reservoir temperature and formation water salinity.The techniques of enhancing oil recovery in Zhongyuan oilfield are optimized,and geologic and development features and current recovery condition of different types of oil reservoirs of Zhongyuan oilfield are summed up.After the analysis of technique potential,it draws the conclusion that CO2 miscible flooding,natural gas immiscible flooding first and then chemical flooding are fit for Zhongyuan oilfield from the reservoir condition and oil nature.Research shows that recovery efficiency can be enhanced by 11.1percentage point to 40.5% in Zhongyuan oilfield by integrated waterflooding adjustment and gas drive.Among them,increased recoverable reserves are 3841×104t and enhanced oil recovery is 7.4 percentage point by integrated waterflooding adjustment,and improved oil recovery is 3.7 percentage point by tertiary oil recovery.The direction and thinking for enhancing oil recovery in Zhongyuan oilfield are summarized that enhancing oil recovery by water flooding is still the key of current development in Zhongyuan oilfield.In the future,the main direction include restructuring development layer series,strengthening development of bad layers,improving waterflooding recovery of reservoir,developing mating technology of water plugging and profile controlling,improving waterflooding control degree and gas driving.
Water flooding
Oil in place
Recovery rate
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Enhancing oil recovery is key technology for oilfield stable yield and sustainable development.Changqing oilfield started to study jurassic oil pool earlier and some experiences and achievement were obtained.Xifeng oilfield is abnormal low permeability pools,losing of the reserves increased and contradiction come forth continuously with the prolonging of the developing time.In this paper,according to characteristics of triassic oil reservoir in Xifeng oilfield,experience of enhancing oil recovery in jurassic oil pool was used for reference,the existing technology of enhancing oil recovery were analyzed,application effect of profile control by water plugging was evaluated,several flooding technologies in Xifeng oilfield and the combination application were summaried.
Water flooding
Water cut
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Using water flooding technology in intermediate zone,minute-fracture pressure water injection and profile control etc.technique carry out rational water flooding,can reach the goal of systematical development heterogeneous reservoir and make degree of water-drive and oil displacement efficiency of low ooze layer improve,formation pressure and productivity of correspondnece oil well increase.Through field application of the water injection oil displacement technique in Qiaokou Oilfield,the results show that the technology can slow down effectively natural lapse of oilfield and keep stable production and high production of oilfield.
Water flooding
Water cut
Oil Production
Steam injection
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