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Liu R.W.,Drilling and Production Technology Research Institute
Advanced Materials Research | Year: 2014

This paper is closely related to chemical degradation of PAM. The degradation refers to any process that breaks down the molecular structure of macromolecules. The most important degradation pathways in oil recovery applications are oxidation reduction, ironic ions and divalents. The influences of each factor is discussed, and preventive measures are also put forward. It is beneficial to provide the degradation of the polymer, and it can largely improve the utilization rate of PAM. © (2014) Trans Tech Publications, Switzerland.


Xiang C.,Drilling and Production Technology Research Institute
Drilling Fluid and Completion Fluid | Year: 2015

A new weak gel water base drilling fluid was formulated with a new developed weak gel agent as the main additive and other additives such as filter loss reducer, shale inhibitor and sealing and plugging agent selected through experiment. Laboratory experiment shows that this drilling fluid has unique rheological behavior, i.e., it has high viscosity at low shear rates, and weak gel is formed quickly within the fluid. This drilling fluid has very good filtration property and superior performance in shale inhibition. The properties of this drilling fluid remain stable at 150℃ or when contaminated by calcium of 4 000 mg/L. Study with SEM and Zeiss microscope shows that sol particles are encapsulated and embedded at the nodal points of a 3D network developed within the drilling fluid. This drilling fluid can form dense sealing layers with good compressibility in formations full of micro fractures or fissures, preventing water from entering into the formations, thus inhibiting the hydration and swelling of shale or formations with high content of clays. ©, 2015, North China Petroleum Administration Drilling Technology Research Institute. All right reserved.


Li B.,Drilling and Production Technology Research Institute
Advanced Materials Research | Year: 2014

Layer steam injection is a most effective method in heavy oil recovery. Layer Steam Injection Simulation Test System is a simulation test system of layer steam injection. It had been independent developed based on technologies such as PC, modern sensor, automatic control etc., so that to solve experimental problems like doing layer steam injection, selecting and testing downhole tools exactly. The system can offer no less than 320 °C and 17MPa experimental environment. The system use heat transfer oil instead of high temperature and high pressure steam to do the experiment, which is a new way to do the similar experiment; the measurement and control system were designed and developed to control the whole system and measure the flow, pressure and temperature. It is determined that system can meet the design in advance through analysis of experimental data. © (2014) Trans Tech Publications, Switzerland.


Liu E.H.,Drilling and Production Technology Research Institute
Applied Mechanics and Materials | Year: 2014

High temperature gel plugging agent was constituted of HG modified resin, cross-linking agent, HS solid particles. In this paper, the factors such as modified resin, cross-linking agent, salinity and HS solid particles, temperature on gel were studied. And the function of agent high temperature gel plugging agent was tested. High temperature gel plugging agent has some characters. For example, it can form gel at a low temperature, and isn’t affected by salinity. It has high strength, and its forming gel time was adjustable. The agent was used in 42 wells, which steam injection pressure were increased largely. The plane and vertical contradictions were improved. The wells product more oil. High temperature gel plugging agent improve steam effect. The application results show that the high temperature gel plugging agent was suitable for water blocking in multiple rounds of steam injection. © (2014) Trans Tech Publications, Switzerland.


Liu E.H.,Drilling and Production Technology Research Institute
Applied Mechanics and Materials | Year: 2014

Heavy oil in Liaohe oilfield is buried in more than 1000 meters, and the steam injection temperature is around 350°C. Through the experiment on surfactant product, high temperature foam surface active agent was developed, which was based on high carbon chain alkyl benzene sulfonate or alkyl toluene sulfonate, and auxiliary solvent and stabilizer were added. High temperature foam surface active agent can meet the needs of steam foam profile control technology. © (2014) Trans Tech Publications, Switzerland.


Xu H.Y.,Drilling and Production Technology Research Institute
Applied Mechanics and Materials | Year: 2014

To reduce environmental pollution caused by waste drilling fluid, Liaohe Oilfield takes methods of sewage pit seepage control and waste drilling solidification disposal. Firstly, different impermeable material comparation has been taken, as a result, high-density polyethylene geomembrane (HDPE) was choosn as the impermeable material for sewage pit.which has features of good seepage control, good chemical stability, low price,non-toxic and environment friendly. According to features of five different landforms in Liaohe Oilfield, corresponding seepage control programs are developed. impermeable material, implementation and measurement of sewage pit are unified and standardized. which prevent contamination of underground water caused by waste drilling fluid effectively. Finally, curing treatment of the waste drilling fluid is carried out, forming a system engineering to meet the needs of environment protection and costs control. © (2014) Trans Tech Publications, Switzerland.


Zhou H.,Drilling and Production Technology Research Institute
Advanced Materials Research | Year: 2012

In oil mining engineering, oil production technology becomes more and more complicated while the oilfield production steps into the middle-later development time, meanwhile, its matching lifting technology becomes more and more complicated and diversified. So the demand of intermediate experiment for lifting technology in petroleum industry becomes more and more obvious. It is necessary to develop a sucker-rod pump lifting simulation experiment system in the lab which can simulate practical work. The developed system can provide reliable experiment data for evaluating sucker-rod pump technical properties and developing new sucker-rod pump. It is benefit to innovate and promote the development of sucker-rod pump lifting technology. © (2012) Trans Tech Publications, Switzerland.


Liu R.W.,Drilling and Production Technology Research Institute
Applied Mechanics and Materials | Year: 2014

The experiments on microscopic displacement of flowing gel flooding after water and polymer flooding were carried out with the sand-packing model. The experimental results of the microscopic displacement indicate that oil recovery can be further enhanced using flowing gel after water and polymer flooding, and the enhanced range is about 15 percent. Flowing gel flows preferentially through the largerchannels occupied previously by injected water in flowing gel injection process, improves sweep efficiency of injected water. Because of its viscoelastic, it can be stretched through the narrow pore deformation. The strength was reduced by the shear, dilution, and it would be driven out by the water from the pores and continue to move forward. Therefore, the main function of flowing gel is flooding, while profile modification is temporary effect. Flowing gel flooding can significantly reduce the cost of chemicals. From the development of tertiary oil recovery trend, flowing gel flooding is a technology that is being developed and perfected, with high technology- economic feasibility. © (2014) Trans Tech Publications, Switzerland.


Xu L.,Drilling and Production Technology Research Institute
Advances in Energy Science and Equipment Engineering - Proceedings of International Conference on Energy Equipment Science and Engineering, ICEESE 2015 | Year: 2015

The flowing model of straight-through type labyrinth sealing has been established by using Navier-Stokes equation and k-ε turbulence model and the numerical modeling research of inner flow field of labyrinth sealing has been conducted by Ansys to achieve the contour map of flowing-field pressure. On this basis, the influences of tooth thickness, tooth height, number of teeth, teeth space, cavity interval and differential pressure between entrance and exit on distributing characteristics of inner pressure of labyrinth sealing have been analyzed. Research results demonstrate that the flow rate increases when fluid goes by the interval of straight-through type labyrinth sealing cavity. After entering labyrinth sealing cavity, the flow rate decreases and vortexes have been generated since the circulation area decreases, which leads fluid to dissipate energy and reduce pressure. As the tooth thickness, tooth height and differential pressure between entrance and exit are bigger, the descend range of the internal flow field pressure becomes bigger. When the number of teeth is larger, the descend range of internal flow field pressure becomes bigger. Until the number of teeth increases to a certain value, the descend range is not influenced by the number of teeth. When the cavity interval is bigger, the descend range of the internal flow field pressure is smaller. When the tooth space is bigger, the descend range of the internal flow field appears to be firstly increasing then decreasing. © 2015 Taylor & Francis Group, London.


Wang H.,Drilling and Production Technology Research Institute
Advanced Materials Research | Year: 2014

In order to improve the quality of sample and decrease the stress during process, it is important to study the residual stress distribution during direct laser metal deposition (LMDS) process. In this paper, according to the "element life and death" technique of finite element method, with APDL, we simulated the effects of Laser power, scanning velocity, substrate preheat temperature and powder addition speed in top layer of samples residual stress distribution during whole LMDS process are studied. The residual stress distribution under different process parameters is researched in detail. Using the same process parameters, the simulation results show good agreement with the features of sample which fabricated by LMDS. © (2014) Trans Tech Publications, Switzerland.

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