scholarly journals Synthesis and Application of a Spirocompound as Clean Viscosity-Reducer for Crude Oil

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Shijun Chen ◽  
Kang Zhao ◽  
Gang Chen ◽  
Li Bai ◽  
Lajun Feng
Keyword(s):  
Crude Oil ◽  
Chemical Properties ◽  
High Viscosity ◽  
Viscosity Reduction ◽  
Molecular Compound ◽  
Viscosity Behavior ◽  
Viscosity Reducer ◽  
Refinement Process ◽  
Oil Refinement ◽  
Technical Operation

Heavy oil transportation has become a highly technical operation facing complex difficulties. One of the major difficulties in the pipeline transportation is the high viscosity that requires efficient and economical ways to deal with. The typical polymer viscosity reducers are a negative problem during oil refinement process for their chemical properties. The objective of this study is to seek small molecular compound, different from the traditional polymers, to reduce the viscosity of the crude oil. In this work, a spirocompound, 3,9-diphenyl-2,4,8,10-tetraoxa-spiro[5.5]undecane, was synthesized catalyzed by zeolite and modified zeolite, and the product was fully characterized by NMR, MS, and TG. Then, it was used as viscosity reducer for crude oil. The factors such as dosage and temperature on the viscosity behavior have been studied. The results showed a significant viscosity reduction at different temperature, and the most economical dosage is 500 ppm. The multiphenyl groups can interact with asphaltene byπ-πstacking, and the spirostructure can fix the stacking in different direction, which can prevent the agglomeration of wax crystals.

Indoor Study of Viscosity Reducer for Thickened Oil of Huancai

2012 ◽  
Vol 268-270 ◽  
pp. 547-550
Author(s):  
Qing Wang Liu ◽  
Xin Wang ◽  
Zhen Zhong Fan ◽  
Jiao Wang ◽  
Rui Gao ◽  
...  
Keyword(s):  
Interfacial Tension ◽  
Oil Recovery ◽  
Heavy Oil ◽  
High Viscosity ◽  
Oil Field ◽  
Viscosity Reduction ◽  
Oil Viscosity ◽  
Low Viscosity ◽  
Viscosity Reducer ◽  
Oil Water

Liaohe oil field block 58 for Huancai, the efficiency of production of thickened oil is low, and the efficiency of displacement is worse, likely to cause other issues. Researching and developing an type of Heavy Oil Viscosity Reducer for exploiting. The high viscosity of W/O emulsion changed into low viscosity O/W emulsion to facilitate recovery, enhanced oil recovery. Through the experiment determine the viscosity properties of Heavy Oil Viscosity Reducer. The oil/water interfacial tension is lower than 0.0031mN•m-1, salt-resisting is good. The efficiency of viscosity reduction is higher than 90%, and also good at 180°C.

scholarly journals Study on Viscosity Reducer Flooding Technology for Deep Low Permeability Extra Heavy Oil Reservoirs

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Xiaopeng Cao ◽  
Zupeng Liu ◽  
Yong Yang ◽  
Shiming Zhang ◽  
Yahui Bu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Crude Oil ◽  
Heavy Oil ◽  
Thermal Recovery ◽  
Water Soluble ◽  
Viscosity Reduction ◽  
Low Permeability ◽  
Oil Reservoir ◽  
Viscosity Reducer ◽  
Heavy Oil Reservoir

Deep low permeability extra heavy oil reservoir has the characteristics of high formation pressure, high crude oil viscosity, and low permeability. Conventional steam injection thermal recovery has poor viscosity reduction performance and low productivity of a single well, which makes it difficult to develop this type of heavy oil reservoir. In this paper, core flooding experiment and microvisualization equipment were used to study the mechanism of improving the recovery of deep extra heavy oil by using water-soluble viscosity reducer; the realization of water-soluble viscosity reducer in numerical simulation was achieved by using nonlinear mixing rule; the reservoir numerical simulation model of water-soluble viscosity reducer displacement in test well group was established to optimize the development technical parameter of water-soluble viscosity reducer. The results show that compared with waterflooding, the oil displacement efficiency of water-soluble viscosity reducer is increased by 12.7%; water-soluble viscosity reducer can effectively reduce the viscosity of extra heavy oil, under the same temperature and permeability, the higher the concentration of viscosity reducer, the better the viscosity reduction effect, and the smaller the pressure gradient required at the same injection rate; the main mechanism of water-soluble viscosity reducer for enhancing oil recovery is to form oil in water emulsion, which can reduce the viscosity and interfacial tension of crude oil and reduce the residual oil saturation; in the pilot well group, the optimized injection concentration of water-soluble viscosity reducer is 3%, and the optimal injection amount of water-soluble viscosity reducer solution is 50 t/d; water-soluble viscosity reducer displacement was implemented in the pilot well group, the average daily oil of well group was increased from 1.8 t/d to 7.34 t/d, and the pilot well group has achieved good development performance.

scholarly journals Synthesis of Alkyl Aliphatic Hydrazine and Application in Crude Oil as Flow Improvers

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4703
Author(s):  
Qiang Deng ◽  
Michal Slaný ◽  
Huani Zhang ◽  
Xuefan Gu ◽  
Yong-Fei Li ◽  
...  
Keyword(s):  
Crude Oil ◽  
Pour Point ◽  
Alkyl Chain ◽  
Reduction Rate ◽  
Viscosity Reduction ◽  
Polar Group ◽  
Waste Oil ◽  
Viscosity Reducer ◽  
Oilfield Chemicals ◽  
Long Alkyl Chain

In this paper, alkyl aliphatic hydrazine, which is different from traditional polymer fluidity improver, was synthesized from aliphatic hydrazine and cetane bromide, and evaluated as a pour point and viscosity-reducer depressant for crude oil. The evaluation results showed that alkyl aliphatic hydrazone fully reduced the pour point and viscosity of crude oil with the increase of crude oil fluidity. The viscosity reduction rate of crude oil in Jinghe oilfield was 79.6%, and the pour point was reduced by about 11.3 °C. The viscosity reduction rate of crude oil in Xinjiang Oilfield was 74.7%, and the pour point was reduced by 8.0 °C. The long alkyl chain is beneficial to the eutectic of wax in crude oil, and the polar group inhibits the crystal growth, resulting in the decrease of pour point and viscosity. The waste oil is fully recycled into oilfield chemicals.

Experimental Investigation of Emulsifying Viscosity Reduction of a New Viscosity Breaker

2014 ◽  
Vol 981 ◽  
pp. 946-950
Author(s):  
Feng Wang ◽  
Chi Ai ◽  
Dan Dan Yuan ◽  
Shuang Liang ◽  
Guang Miao Qu
Keyword(s):  
Heavy Oil ◽  
Reduction Rate ◽  
High Viscosity ◽  
Viscosity Reduction ◽  
Key Factors ◽  
Typical Sample ◽  
Viscosity Reducer ◽  
New Type ◽  
The Stability ◽  
Fatty Alcohol Polyoxyethylene Ether

In this paper, alkyl polyglucoside (APG) and fatty alcohol polyoxyethylene ether (AEO3) were prepared to obtain a new type of soluble viscosity reducer which can change the rheological behavior of the crude oil and reduce its viscosity using method of emulsification viscosity reduction. The typical sample of heavy oil produced in Jilin oilfield was analyzed to figure out the key factors of influencing the viscosity of this heavy oil and the static evaluation experiments were carried out to investigate the reducing performance of the viscosity breaker. The viscosity breaker can lower the interfacial tension between oil and water to some extent, and the stability of emulsion between the oil and water is relatively good, in addition, it can provide high viscosity reduction rate and detergent factor of oil to produce a good viscosity reduction performance.

Synthesis and Evaluation of Hydroxymethyl Tetramides as Flow Improvers for Crude Oil

2020 ◽  
Vol 42 (4) ◽  
pp. 488-488
Author(s):  
Xuefan Gu Xuefan Gu ◽  
Peng Wang Peng Wang ◽  
Zhen Guo Zhen Guo ◽  
Weichao Du Weichao Du ◽  
Sanbao Dong Sanbao Dong
Keyword(s):  
Crude Oil ◽  
Pour Point ◽  
Crystal Morphology ◽  
Reduction Rate ◽  
Viscosity Reduction ◽  
Scanning Calorimetry ◽  
Point Reduction ◽  
Viscosity Reducer ◽  
Reduction Effect ◽  
Morphology Characterization

In this work, a series of hydroxymethyl tetramide (HMTEA) was synthesized from vegetable oil, triacetylenetetramine and hexamethylenetetramine, which was evaluated as viscosity reducer and pour point depressor for crude oil. The results showed that HMTE has a good viscosity reduction effect on the crude oil from Yanchang Oilfield, with the highest viscosity reduction rate of 93%. The highest pour point reduction depression was achieved as 6.5℃. Differential scanning calorimetry and paraffin crystal morphology characterization were conducted on the crude oil to elucidate the mechanism of viscosity reduction and pour point depression.

Heavy crude oil viscosity reduction and rheology for pipeline transportation

Fuel ◽  
2010 ◽  
Vol 89 (5) ◽  
pp. 1095-1100 ◽  
Author(s):  
Shadi W. Hasan ◽  
Mamdouh T. Ghannam ◽  
Nabil Esmail
Keyword(s):  
Crude Oil ◽  
Viscosity Reduction ◽  
Heavy Crude Oil ◽  
Pipeline Transportation ◽  
Oil Viscosity ◽  
Heavy Crude

Successfully Optimizing Breakers in Polyacrylamides for Slickwater and High-Viscosity Fluids

2021 ◽  
Author(s):  
Sarkis Kakadjian ◽  
Jarrett Kitchen ◽  
Amanda Flowers ◽  
John Vu ◽  
Amanuel Gebrekirstos ◽  
...  
Keyword(s):  
Light Scattering ◽  
Active Material ◽  
High Viscosity ◽  
High Rate ◽  
Viscosity Reduction ◽  
Superior Performance ◽  
Size Distributions ◽  
Pore Throat ◽  
Eagle Ford ◽  
Fracture Conductivity

Abstract Polyacrylamide-based friction reducers (FR's) - including viscosifying polyacrylamides, which are designed to decrease proppant settling by increasing molecular weight and/or active material in the FR - are used extensively in high-rate fracture stimulations. However, because polyacrylamides are difficult to break, there have been concerns about how these materials impact fracture conductivity and formation permeability. This study presents the effect of conventional and novel oxidative breakers over the viscosity and colloidal size distribution of the broken polymers. Breakers tested include conventional persulfates, perborates and patent pending peroxides, all of which generate free radicals to degrade partially hydrolyzed polyacrylamides (PHPAs). Breakers were tested at bottomhole temperatures encountered in the Permian, Bakken, Haynesville and Eagle Ford. Changes to PHPA viscosity were determined using vibrational viscometers. Size distributions and percentage of the broken colloidal PHPA were determined by dynamic light scattering. This method can measure sizes down to 0.6 nanometers, which is within the range of even the smallest pore-throat sizes in shales. Light scattering revealed surprising anomalies in breaker performance. When aged at temperatures typical of the Permian, each of the tested breakers at each of the varied concentrations caused similar levels of viscosity reduction but different size distributions. Some breakers had the unwanted effect of narrowing the colloidal size fractions to the lower end of the spectrum. At these small sizes, colloids are more likely to overlap with segments of the pore throat distribution in some shales, which could inhibit production. In addition, when the FR was aged at the higher temperatures encountered in the Bakken, Eagle Ford and Haynesville, some breakers were not able to uniformly break the PHPA. In these cases, FR's without breakers delivered superior performance. The results clearly demonstrate that breakers may not always have the desired effect of increasing the formation's permeability. In fact, depending on the type of breaker and the concentration, they can often have detrimental effects that ultimately hinder production.

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