Experimental Study on Blockage of Gas Hydrate Slurry in a Flow Loop

2012 ◽  
Author(s):  
Xiaofang Lv ◽  
Da Yu ◽  
Wenqing Li ◽  
Bohui Shi ◽  
Jing Gong
Keyword(s):  
Influencing Factor ◽  
Hydrate Formation ◽  
Diesel Oil ◽  
Flow Loop ◽  
Relative Time ◽  
Key Points ◽  
Oil And Natural Gas ◽  
Multi Phase Flow ◽  
Series Of Experiments ◽  
Multi Phase

Hydrate formation and blockage in long deepwater pipelines has long been a trouble for offshore petroleum production. Consequently, understandings of the procedures as well as influencing factors of hydrate blockage are key points to make reasonable flow assurance strategies. Thus two series of experiments have been conducted in a high-pressure hydrate flow loop newly constructed by multi-phase flow research group in China University of Petroleum (Beijing). One of the systems consists of water and CO2, while the other one includes water, diesel oil and natural gas. The relative time of hydrate blockage has been studied by varying pressure and flow rate for both two systems. The dimensions of hydrate particles in fluid during plugging are also investigated. The results indicate that the influencing factor exerts a similar effect on the relative time for the different systems. Besides, the sizes of particles in the fluid would change significantly due to hydrate formation.

Experimental Study on Natural-Gas-Hydrate-Slurry Flow

SPE Journal ◽  
2013 ◽  
Vol 19 (02) ◽  
pp. 206-214 ◽  
Author(s):  
X.F.. F. Lv ◽  
J.. Gong ◽  
W.Q.. Q. Li ◽  
B.H.. H. Shi ◽  
D.. Yu ◽  
...  
Keyword(s):  
Natural Gas ◽  
Length Distribution ◽  
Hydrate Formation ◽  
Diesel Oil ◽  
Slurry Flow ◽  
Flow Loop ◽  
Reflectance Measurement ◽  
System Pressure ◽  
Series Of Experiments ◽  
Water Cut

Summary To better understand hydrate-slurry flow, a series of experiments was performed, including water, natural gas, and diesel oil, under 4-MPa system pressure and 1.25-m/s initial linear velocity. The experiments have been conducted in a high-pressure hydrate-flow loop newly constructed at China University of Petroleum (Beijing), and dedicated to flow-assurance studies. A focused-beam reflectance measurement (FBRM) probe is installed in this flow loop, which provides a qualitative chord length distribution (CLD) of the particles/droplets in the system. First, the influence of flow rate on the hydrate-slurry flow was discussed. Then, we studied other influencing factors—such as water cut and additive dosage—on the hydrate induction period and the CLD before/after hydrate formation. Third, a new correlation was fitted between the dimensionless rheological index n′ and water cut as well as additive dosage, according to these experimental data. Finally, a laminar-flow model for the prediction of the pressure drop for the quasisingle-phase hydrate slurry was established, and tested by comparison with the experimental results in this paper.

Novel In-Line Inspection Tool for Deposit Characterization in Pipelines

2021 ◽  
Author(s):  
Ossi Lehtikangas ◽  
Arto Voutilainen ◽  
Antti Nissinen ◽  
Pasi Laakkonen ◽  
Sinoj Cyriac ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Test Results ◽  
Flow Loop ◽  
Electrical Tomography ◽  
Gas Industry ◽  
Chemical Inhibitors ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
Production Problems

Abstract Deposition formation inside pipelines is a major and growing problem in the oil and gas industry. The optimal use of prevention and remediation tools such as chemical inhibitors and cleaning processes could lead to major savings due to minimized production problems and optimized pipe cleaning costs. This requires characterization and quantification of the actual deposits inside pipelines and downholes. Recently, a novel deposition inline inspection sensor moving inside the pipeline has been proposed based on "inside-out" electrical tomography. In this sensor, the distribution of electrical properties between the sensor and the pipe wall are estimated based on measurements carried out using electrodes around the sensor. In this study, the next generation sensor moving inside the pipeline is described and a deep neural network based approach to deposit estimation is introduced. Test results from a 70 m long semi-industrial scale flow loop containing paraffin wax and calcium carbonate deposits of different thicknesses are shown. Challenges include the changing position and orientation of the sensor during the low. The results show that the sensor is able to measure both deposit thickness and type with good accuracy which indicates that the sensor is suitable for industrial use. Accurate knowledge about deposits allows future blockage prevention, detecting build-up locations in the early phase, increasing accuracy of multi-phase flow and deposition models, optimization of chemical use and validation of deposit cleaning tools before integrity campaigns leading to overall reduced pipeline operation costs.

scholarly journals Study on microscopic growth mechanism of emulsion system hydrate

2020 ◽  
Vol 37 (3) ◽  
pp. 71-77
Author(s):  
Jin Zhang ◽  
An Chen ◽  
Menglan Duan
Keyword(s):  
Growth Mechanism ◽  
Hydrate Formation ◽  
Emulsion System ◽  
Water Droplets ◽  
Natural Gas Hydrate ◽  
Flow Loop ◽  
Hydrate Shell ◽  
Physical Information ◽  
Series Of Experiments ◽  
Hydrate Formation Process

In order to master the microscopic growth mechanism of natural gas hydrate, a series of experiments were carried out using a high-pressure hydrate flow loop. The microscopic physical information of the growth of hydrates in the emulsion system is captured by advanced microscopic equipment and the phenomena of the experiments show that: 1) not all water droplets instantaneously generate a hydrate shell, but only a few of the water droplets gradually generate a hydrate shell when reaching the conditions of the hydrate formation; and 2) the coalescence and shear do occur in the hydrate formation process, and the distribution of hydrate particle size has changed.

Evaluation of the impact of multi-phase flow on reservoir signatures in the Wolfcamp shale

2020 ◽  
Vol 76 ◽  
pp. 103187
Author(s):  
C.R. Clarkson ◽  
B. Yuan ◽  
Z. Zhang ◽  
F. Tabasinejad ◽  
H. Behmanesh ◽  
...  
Keyword(s):  
Phase Flow ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
The Impact
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