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Measurement Scheme of Local Water Holdup in Oil-Water Two-Phase Flow Based on Edge Effect of Interdigital Capacitance Method
Chen Qiang,
Qin Minjun,
Liu Guoquan,
Li Qingping,
Yu Houquan,
Wei Yong,
Fang Yu
Issue:
Volume 6, Issue 5, September 2018
Pages:
81-87
Received:
21 June 2018
Accepted:
5 July 2018
Published:
27 August 2018
Abstract: In order to realize array measurement of water holdup on oil well section, a capacitance-based sensor with planar inter-digital structure is proposed, an integrated detecting module is designed, which converts the measured capacitance value to periodic signal with corresponding frequency, a circuit which extracts signal from current change of power supply is developed. The experimental result shows the above solution has advantages to minimize size sensor, less connections between sensor and circuit boards, strong anti-interference performance and high definition when water holdup is not above 50%, thereby, it has important reference value for developing array capacitance-based log tool for water holdup measurement.
Abstract: In order to realize array measurement of water holdup on oil well section, a capacitance-based sensor with planar inter-digital structure is proposed, an integrated detecting module is designed, which converts the measured capacitance value to periodic signal with corresponding frequency, a circuit which extracts signal from current change of power...
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Application of Reservoir-Predicting Technique to Thin Sandstones in Coal-Bearing Strata in Block K
Liu Leisong,
Chen Zhigang,
Chen Jie,
Ma Hui,
Sun Xing,
Wang Yuzhu,
Han Yuchun
Issue:
Volume 6, Issue 5, September 2018
Pages:
88-95
Received:
30 May 2018
Accepted:
9 August 2018
Published:
10 September 2018
Abstract: In Block K of South Turgay Basin in central Kazakhstan, the development of target, Aibalin, is controlled by the boundary of graben (especially rift-type stratigraphy-lithology assemblage). The Aibalin Fm is mainly developed with delta and lakeshore swamp facies, and composed of grey sandstone, siltstone, shale and coal-bearing strata, with extensive carbonized vegetal debris. Moreover, it contains thin and horizontally-variable reservoirs. Coal beds affect seismic survey greatly. Because of the influence of tuning effect in seismic data, thin sandstone reservoir distribution and physical properties cannot be reflected accurately in seismic data. Meanwhile, thin sandstone reservoir cannot be effectively predicted through seismic-based conventional inversion methods and processes. In this paper, a new prediction process for thin sandstone reservoir in this block is proposed, contributing to the effective prediction of thin sandstone reservoir distribution and physical properties. Firstly, sensitive parameters for lithology interpretation are defined and lithology interpretation template was established, through comprehensive analysis of drilling, logging and seismic data. Secondly, seismic wave impedance Bayes inversion genetic algorithm and cloud transform gamma attribute prediction technique are used to derive wave impedance and gamma data volume. Finally, the wave impedance and gamma data volume are combined with lithology interpretation template to predict the physical properties of the reservoirs.
Abstract: In Block K of South Turgay Basin in central Kazakhstan, the development of target, Aibalin, is controlled by the boundary of graben (especially rift-type stratigraphy-lithology assemblage). The Aibalin Fm is mainly developed with delta and lakeshore swamp facies, and composed of grey sandstone, siltstone, shale and coal-bearing strata, with extensi...
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Study and Application of Hydraulic Jet Radial Drilling in Carbonate Reservoirs
Yan Jun,
Cui Mingyue,
He Anle,
Jiang Weidong,
Liang Chong
Issue:
Volume 6, Issue 5, September 2018
Pages:
96-101
Received:
31 July 2018
Accepted:
14 August 2018
Published:
12 September 2018
Abstract: The hydraulic jet radial drilling technology is a low-cost production and completion technology for effectively developing low-permeability marginal reservoirs, thin-bed reservoirs with edge and bottom water, and depleted oil and gas fields. It has been successfully and widely applied in sandstone, coalbed methane, and heavy oil reservoirs. In order to explore its application in carbonate reservoirs, specially economically and efficiently develop low-permeability thin-layer carbonate reservoirs, the pilot of hydraulic jet radial drilling technology in the carbonate reservoir application was successfully completed through the research on the principle, advantage, existing problems and application condition of radial jet drilling, economic productivity was got, and cost-effective development was achieved, this pilot provided a method for the development of low permeability thin layer carbonate reservoir. This research shows that the hydraulic jet radial drilling technology has its unique technical advantages, which can enable some reservoirs to increase production or injection, but it is not suitable for every well, it has certain applicable conditions, such as the depth, thickness, and temperature of the target zone, and the conditions of well inclination, casing and wellbore have certain requirements too. The hydraulic jet radial drilling technology can achieve the expected target based on the zone and well selection, in selecting layers, as far as possible, homogeneous oil layers with good reservoir physical properties should be selected; the key of its successful implementation is the depth and azimuth control, wellbore diameter and operation safety control. The application of hydraulic jet radial drilling in carbonate reservoirs will make the spray hose wear large due to its high Young's modulus the high hardness, which affects the treatment footage; the use of acid in jet drilling can increase the radial drilling footage, but on the other hand can also produce impurities affecting the operation. The working fluid for jetting must meet the requirements of no solid phase.
Abstract: The hydraulic jet radial drilling technology is a low-cost production and completion technology for effectively developing low-permeability marginal reservoirs, thin-bed reservoirs with edge and bottom water, and depleted oil and gas fields. It has been successfully and widely applied in sandstone, coalbed methane, and heavy oil reservoirs. In orde...
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Research and Application Effect of High Precision Contemporanenous Display of River Channel and Sand Body Technology Based on Algorithm Optimization
Jiaguo Ma,
Jun Ming,
Jianli Wang,
Teng Wang
Issue:
Volume 6, Issue 5, September 2018
Pages:
102-109
Received:
21 August 2018
Accepted:
10 September 2018
Published:
25 September 2018
Abstract: The contemporaneous presentation of river channel, sand body and mud on the seismic attribution slice is the research that seismogeology personnel desire to realize. Especially at the oil field development stage, the research is very important to deploy the location of injection and production well. This paper takes A oil field, Bohai Bay area as the target region, on the basis of negative 90 degree rotation data volume, selects out the best Algorithm to depict river channel and sand body precisely and realizes the river and sand attributes data fusion. Based on this, the relationship between river, sand and mud were contemporaneously presented. Through combined research on well data, it verifies that the profile and slice of seismic data are in accord with well data. Based on this technology, the development and evolution of river channel and the internal structure of point bar were studied, and the historical evolution process of meander river channel was recovered, which provides a strong basis for residual oil research and high production adjusting well deployment.
Abstract: The contemporaneous presentation of river channel, sand body and mud on the seismic attribution slice is the research that seismogeology personnel desire to realize. Especially at the oil field development stage, the research is very important to deploy the location of injection and production well. This paper takes A oil field, Bohai Bay area as t...
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The Effect of Water Index on Water Cut Increasing Rate
Yanhui Zhang,
Yingxian Liu,
Hongyou Zhang,
Chunxin Wu,
Baolin Yue
Issue:
Volume 6, Issue 5, September 2018
Pages:
110-115
Received:
15 August 2018
Accepted:
3 September 2018
Published:
25 September 2018
Abstract: Water cut is an important evaluation index which can comprehensively reflects the development effect of a water flooding reservoir. Study the variation law of water cut is very important for reservoir development evaluation. A mathematical model for estimate water cut and water cut increasing rate was established based on Corey expression of relative permeability curve and fraction flow equation. Three parameters were proposed to quantitatively describe the character of water cut increasing rate. The three parameters have specific meanings and can describe the shape character of the relation curve between water cut increasing rate and water cut and the relation curve between water cut increasing rate and recovery percent. The effect of water index on water cut increasing rate was discussed. The relationship curve between three parameters and water index under the condition of different water oil mobility ratio was established. The result shows that when water-oil mobile ratio is greater than 10, water index has great effect on water cut increasing rate. With the increase of water index, the maximum value of water cut increasing rate gradually increase, the recovery degree when water cut increasing rate reaches the maximum value gradually increase and the water cut when water cut increasing rate reaches the maximum value also gradually increase. When water-oil mobile ratio is less than 10, water index has little effect on water cut increasing rate.
Abstract: Water cut is an important evaluation index which can comprehensively reflects the development effect of a water flooding reservoir. Study the variation law of water cut is very important for reservoir development evaluation. A mathematical model for estimate water cut and water cut increasing rate was established based on Corey expression of relati...
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Several Key Problems Related with the Commissioning and Operation of Crude Oil Tank Farm in Sino-Myanmar Pipeline
Jian Cai,
Li Ren,
Yuntao Bai
Issue:
Volume 6, Issue 5, September 2018
Pages:
116-119
Received:
5 June 2018
Accepted:
4 July 2018
Published:
27 September 2018
Abstract: The Maday Island in the southwest of Myanmar is faced with the difficulties of poor natural conditions and deficient social support resources, so the requirements on the commissioning and operation of Maday Island crude oil tank farm in the Sino-Myanmar Pipeline are quite strict. In this paper, the key problems involved in the commissioning preparation and process of crude oil tank farm were summarized, including emergency material preparation, equipment check in the tank farm and safe commissioning plan. Then, the shortages of equipment selection, material selection and construction process during the operation of crude oil tank farm were analyzed. And finally, the optimization measures were put forward correspondingly. The practical experience provides the best reference and instruction for the design, construction and operation of subsequent projects of the same type.
Abstract: The Maday Island in the southwest of Myanmar is faced with the difficulties of poor natural conditions and deficient social support resources, so the requirements on the commissioning and operation of Maday Island crude oil tank farm in the Sino-Myanmar Pipeline are quite strict. In this paper, the key problems involved in the commissioning prepara...
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Separate Layer Fracturing Technology of Hybrid Fluid on Thick Tight Sandstone Reservoir, Case Study of Huaqing Oil Field
Li Chuan,
Chen Qiang,
Zhang Tongwu,
Yu Xingguo,
Xian Cheng,
Xiang Kui
Issue:
Volume 6, Issue 5, September 2018
Pages:
120-125
Received:
13 August 2018
Accepted:
31 August 2018
Published:
10 October 2018
Abstract: The tight and thick sandstone reservoir, which is represented by Huaqing oilfield, was stimulated by the separated layer fracturing technology in the early period which produces discharge multi-channel between the pay formation and wellbore. For the conventional refracturing technology, the combination of tubing and packers is employed to treat the target layers in sequence. Nevertheless, this conventional technology is confined by the size of the tubing so that the maximum pumping rate can only reach to 3 to 4m3/min. It can’t meet the requirement of high pumping rate of hybrid fluid SRV fracturing that the treatment effort is not optimum and the stimulation efficiency is very low. In this article, in order to resolve the refracturing problems above for old wells, we introduced a state-of-art downhole releasing separated layer volume fracturing technology and support tools. By applying the releasing tool assembly and exclusive fishing tools, some goals can be easily achieved: to realize the efficient isolation between target layers, to protect the casing while fracturing, to meet the pump rate requirement of SRV fracturing of 11m3/min. We deployed the pilot field experiment of Huaqing oilfield and realized the “separated layer multistage SRV fracturing” of tight and thick reservoir. The result shows that the initial production rate of trial wells increases by 2.42t/d. The field test indicates that this technology presents some advantages such as high pump rate, simple tool assembly, easy operation and low operation risk.
Abstract: The tight and thick sandstone reservoir, which is represented by Huaqing oilfield, was stimulated by the separated layer fracturing technology in the early period which produces discharge multi-channel between the pay formation and wellbore. For the conventional refracturing technology, the combination of tubing and packers is employed to treat the...
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