scholarly journals Development and Application of Efficient Oil Displacement System for Middle-Low Permeability and High Pour-Point Heavy Oil Reservoirs

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Zhenfu Ma ◽  
Kai Zhang ◽  
Mengjie Zhao ◽  
Lu Liu ◽  
Chao Zhong ◽  
...  
Keyword(s):  
Crude Oil ◽  
Pour Point ◽  
Freezing Point ◽  
Reduction Rate ◽  
Field Application ◽  
Viscosity Reduction ◽  
Low Permeability ◽  
Oil Viscosity ◽  
Oil Displacement ◽  
Displacement System

In view of the problems of low permeability, high oil viscosity and freezing point, and low productivity of single well in Luo 321 and Luo 36 blocks of Luojia Oilfield, the chemical viscosity-reducing cold production technology was studied. By analyzing the properties of crude oil, it is concluded that the reason for high viscosity and high freezing point is the high content of asphaltene, pectin, and wax. The viscosity is mainly affected by asphaltene; the wax precipitation point and pour point are mainly affected by the wax; and the solidification point is affected by the wax and asphaltene. The treatment idea of reducing viscosity and inhibiting wax is determined. By compounding the synthetic pour point depressant POA-VA and the viscosity reducer DBD-DOPAMA, the effect of reducing the viscosity and freezing point of crude oil was evaluated. PD-7 (POA-VA 40%, DBD-DOPAMA 50%, and P-10C 10%) system was selected as the optimal formula. When the concentration of the system is 10%, the viscosity reduction rate reaches 95.2%; the freezing point can reduce by 10.2°C; it has good oil sample adaptability, salinity resistance, and temperature resistance; and the oil washing rate can reach more than 60%. The oil displacement system was injected into the formation by means of multiconcentration and multislug and was applied in the field of Luo 321-2 Well. A total of 500 t of the oil displacement system was injected, and the effect of measures lasted for 400 days, with a cumulative oil increase of 883 t. It has been applied in different blocks 30 times and achieved a good field application effect.

Development of pour point depressants for crude oil and study of their properties

2021 ◽  
pp. 90-96
Author(s):  
K.I. Matiev ◽  
◽  
A.M. Samedov ◽  
F.M. Akhmedov ◽  
◽  
...  
Keyword(s):  
Crude Oil ◽  
Pour Point ◽  
Viscosity Reduction ◽  
Ionic Surfactant ◽  
Oil Viscosity ◽  
Pour Point Depressant ◽  
Depressant Additive ◽  
Point Depressant ◽  
Pour Point Depressants

A pour point depressant additive has been developed to reduce the pour point of paraffinic oils. The depressant contains a (non-ionic) surfactant, a depressant component and a solvent. The depressor properties of the developed compositions have been studied. It has been established that while adding the compositions to the oil mixture, at a concentration of 0.02% wt. the pour point decreases from +31 oC to -3 - +7 оС, and at a concentration of 0.04% wt. up to -5- + 4 оС. Under the effect of the developed compositions the oil viscosity at + 35 оС decreases from 46.3 mPa·s to 22.1-27.7 mPa·s, and at + 40 °C - from 38.2 mPa·s to 16.6-21.6 mPa·s. Viscosity reduction performance at the indicated temperatures are 40.2-51.6% and 43.5-56.5%, respectively. Compositions 8, 14 and 17 exhibit higher depressor properties.

Oil-Soluble DRA Development and Application

2012 ◽  
Vol 430-432 ◽  
pp. 2083-2086 ◽  
Author(s):  
Zheng Jun Long ◽  
Ya Rong Fu ◽  
Dong Qing Li ◽  
Yuan Hong Cai
Keyword(s):  
Crude Oil ◽  
Freezing Point ◽  
Average Rate ◽  
Back Pressure ◽  
Viscosity Reduction ◽  
Oil Viscosity ◽  
Technical Application ◽  
Single Tube ◽  
Point Depressant ◽  
Before And After

To solve the single tube gathering process paraffin oil viscosity reduction shaft and gathering the problem of high back pressure. Technical application of crude oil pour point depressant, mixed ester, benzene, ethylene oxide such as octylphenol ether compound by an oil-soluble DRA. Dosage in the 50 ~ 100mg/l to meet the water when the wellbore is less than 25% of the wax viscosity and single-tube process requirements gathering, can be compared to the multi-port wells, monitoring data before and after dosing showed that the crude oil after dosing freezing point decreased 5.6 °C, the average rate of 87.4% viscosity reduction, the average rate of 91.5% paraffin. Pipeline wellhead back pressure reduced by 20 to 30 percentage points

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.

Preparation of Crude Oil Flow Improver from Vegetable Oil and the Performance Evaluation

2018 ◽  
Vol 777 ◽  
pp. 226-231
Author(s):  
Jing Fang Xu ◽  
Zhen Guo ◽  
Fa Wang Zhang ◽  
Da Chuang Wang ◽  
Zhen Wang ◽  
...  
Keyword(s):  
Crude Oil ◽  
Vegetable Oil ◽  
Pour Point ◽  
Reduction Rate ◽  
Viscosity Reduction ◽  
Point Reduction ◽  
Oil Flow ◽  
Reduction Effect ◽  
Tetraethylene Pentamine ◽  
Flow Improver

In this work, a series of hydroxylmethyl pentamine (HMPA) was synthesized from vegetable oil, tetraethylene pentamine and hexamethylenetetramine, which was evaluated as a crude oil flow improver. The results showed that HMPAs have 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 5.4°C. Paraffin crystal morphology characterization was conducted on the crude oil to elucidate the mechanism of viscosity reduction and pour point depression.

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.

scholarly journals Effect of nano pour point depressant on the flow properties of the waxy crude oil from Changqing Oilfield

2021 ◽  
Vol 329 ◽  
pp. 01050
Author(s):  
Huatao Wen ◽  
Songzhao Zhang ◽  
Yubo Lian ◽  
Zhiguang Zhao ◽  
Weibo Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Crude Oil ◽  
Pour Point ◽  
Reduction Rate ◽  
Viscosity Reduction ◽  
Pour Point Depressant ◽  
Waxy Crude Oil ◽  
Scanning Calorimetry ◽  
Waxy Crude ◽  
Point Depressant

In this paper, graphene oxide (GO) was modified with alkyl amidopropyl diethanolamine to obtain a nano pour point depressant (GO-PPD), which was used to improve the flowability of the waxy oil extracted from Changqing Oilfield, China. Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), polarized optical microscopy (POM) and viscometer were employed to evaluate the performance of the GOPPD. The results showed that compared with traditional pour point depressant (PPD), the GO-PPD exhibited higher performance in promoting the flowability of waxy crude oil. With the presence of 500 mg/kg GO-PPD in the waxy crude oil, the pour point of which could be reduced by 5.5 °C. Also, with the presence of 500 mg/kg GO-PPD, the viscosity reduction rate of the waxy crude oil can reach up to 52% at 30 °C. Through the observation via polarized microscopy, we have also found that with the introduction of GO-PPD in the crude oil, the formation of the wax crystals can be greatly retarded. This confirmed that the graphene oxide derivates could also be served as PPD, which facilitates the flowability of certain crude oil (e.g., waxy crude oil from Changqing Oilfield).

A Pilot Test Using Microbial Paraffin-Removal Technology in Daqing Oilfield

2012 ◽  
Vol 550-553 ◽  
pp. 1299-1303 ◽  
Author(s):  
Jiang Hong Liu ◽  
Yun Peng Jia ◽  
Rui Dan Xu ◽  
Peng Ju Zhao
Keyword(s):  
Surface Tension ◽  
Crude Oil ◽  
Ph Value ◽  
Freezing Point ◽  
Reduction Rate ◽  
Oil Production ◽  
Oil Viscosity ◽  
Isolation And Purification ◽  
Rate Of Growth ◽  
Removal Technology

Microorganisms were screened from oil wastewater in Daqing Oilfield, by acclimatization, isolation and purification of microorganisms, bacterium as the only nitrogen source was obtained, which was named for strain Y-1. Experiment of identification showed that Y-1 was identified to Bacillus Cereus. Strain Y-1 was used for paraffin removal on three wells: Well Nos. 12-36, 13-39 and 14-43 in Yushulin Zone Daqing Oilfield. The results indicated that the tested wells obtained good effects after microbial treatment: the reduction rate of oil viscosity was 23.6%, the freezing point of crude oil reduced by 2.1°C, the reduction rate of oil surface tension was 38.0%, pH value was reduced from 7.2 to 6.2, daily oil production increased from 1.7t·d-1 to 2.4t·d-1, the rate of growth was 41.2%, the period of hot washings prolonged from 40d to 149d and the number of hot washings reduced by 4 times in Well 12-36; the reduction rate of oil viscosity was 24.8%, the freezing point of crude oil reduced by 2.7°C, the reduction rate of oil surface tension was 42.5%, pH value was reduced from 7.2 to 6.8, daily oil production increased from 1.2t·d-1 to 1.6t·d-1, the rate of growth was 33.3%, the period of hot washings prolonged from 45d to 158d and the number of hot washings reduced by 5 times in Well 13-39; the reduction rate of oil viscosity was 22.5%, the freezing point of crude oil reduced by 3.2°C, the reduction rate of oil surface tension was 42.5%, pH value was reduced from 7.2 to 6.4, daily oil production increased from 0.8t·d-1 to 1.1t·d-1, the rate of growth was 37.5%, the period of hot washings prolonged from 30d to 122d and the number of hot washings reduced by 5 times in Well 14-43. The direct economic income exceeded 210,000 Yuan.

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

Use CO2 Soluble Surfactant to Decrease the Minimum Miscibility Pressure of CO2 Flooding in Oil Reservoir

2011 ◽  
Vol 239-242 ◽  
pp. 2650-2654
Author(s):  
Fu Chen ◽  
Jie He ◽  
Ping Guo ◽  
Yuan Xu ◽  
Cheng Zhong
Keyword(s):  
Citric Acid ◽  
Crude Oil ◽  
Water System ◽  
Viscosity Reduction ◽  
Mass Ratio ◽  
Oil Viscosity ◽  
Minimum Miscibility Pressure ◽  
Oil Water ◽  
Carbon Dioxide Miscible Flooding ◽  
Soluble Surfactant

According to the mechanisms of carbon dioxide miscible flooding and previous researchers’ work on synthesis of CO2-soluble surfactant, Citric acid isoamyl ester was synthesized, and it’s oil solubility and the rate of viscosity reduction both in oil-water system and oil were evaluated. And then we found that this compound can solve in oil effectively; the optimum mass of Citric acid isoamyl ester introduced in oil-water system is 0.12g when the mass ratio of oil and water is 7:3 (crude oil 23.4g, formation water 10g) and the experimental temperature is 50°C , the rate of viscosity reduction is 47.2%; during the evaluation of the ability of Citric acid isoamyl ester to decrease oil viscosity, we found that the optimum dosage of this compound in 20g crude oil is 0.2g when the temperature is 40°C, and the rate of viscosity reduction is 7.37% at this point.

Asphaltene Deposition Induced by Carbon Oxide and its Influence on Displacement Efficiency

2012 ◽  
Vol 594-597 ◽  
pp. 2451-2454
Author(s):  
Feng Lan Zhao ◽  
Ji Rui Hou ◽  
Shi Jun Huang
Keyword(s):  
Crude Oil ◽  
Oil Recovery ◽  
Carbon Oxide ◽  
Viscosity Reduction ◽  
Core Flooding ◽  
Displacement Efficiency ◽  
Oil Composition ◽  
Oil Viscosity ◽  
Asphaltene Deposition ◽  
Total Oil

CO2is inclined to dissolve in crude oil in the reservoir condition and accordingly bring the changes in the crude oil composition, which will induce asphaltene deposition and following formation damage. In this paper, core flooding device is applied to study the effect of asphaltene deposition on flooding efficiency. From the flooding results, dissolution of CO2into oil leads to recovery increase because of crude oil viscosity reduction. But precipitated asphaltene particles may plug the pores and throats, which will make the flooding effects worse. Under the same experimental condition and with equivalent crude oil viscosity, the recovery of oil with higher proportion of precipitated asphaltene was relatively lower during the CO2flooding, so the asphltene precipitation would affect CO2displacement efficiSubscript textency and total oil recovery to some extent. Combination of static diffusion and dynamic oil flooding would provide basic parameters for further study of the CO2flooding mechanism and theoretical evidence for design of CO2flooding programs and forecasting of asphaltene deposition.

Sign in / Sign up

Export Citation Format

Share Document