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Chaoyang, China

Cai L.,North Star Times Tower
Drilling Fluid and Completion Fluid | Year: 2015

Yield is an important parameter of bentonite.The determination of this parameter is quite complex and time consuming. Lack of known properties of clay samples and difference in laboratory operator's skills play an important role in the success of the determination. Repeatability of determining the yield of bentonite is poor, and different persons measuring the yield of the same bentonite sample may give different results. It has been found that these problems can be mitigated or even eliminated using Excel's trend line fitting function. Validation of experiment data proves that clay suspension formulated with bentonite determined by the "trend line fitting" function has Fann35 readings closely agree with theoretical values, indicating that this method of yield determination is accurate and efficient. ©, 2015, North China Petroleum Administration Drilling Technology Research Institute. All right reserved. Source


Gao S.,North Star Times Tower | Wang C.,North Star Times Tower
Drilling Fluid and Completion Fluid | Year: 2015

Gas hydrates are easy to form in deep-water drilling, imposing great dangers to the drilling operation. Conditions under which gas hydrates are formed vary with gas composition, making it difficult to prevent the formation of gas hydrates. Using a newly developed device, the kinetics of the formation of natural gas hydrates in two water base drilling fluids is studied. Of the three gas compositions, the "Green canyon gas" forms gas hydrates in drilling fluid most easily, methane is the most difficult forming gas hydrates, with the simple gas mixture in between. With other conditions being the same, it is much easier for alkane of higher molecular weight to form gas hydrate in drilling fluids. ©, 2015, North China Petroleum Administration Drilling Technology Research Institute. All right reserved. Source


Yang F.,North Star Times Tower | Yang X.,North Star Times Tower | Kong Y.,North Star Times Tower | Dong X.,North Star Times Tower
Drilling Fluid and Completion Fluid | Year: 2015

As an oncoming computational chemistry technology, molecular simulation has found many more applications in computeraided molecular design, structure solution, and physical property prediction, and is widely used in petroleum industry, chemical engineering, food, pharmacy, and aviation etc. The application of molecular simulation in the field of drilling fluids, such as the mechanism of clay hydration and swelling, design of clay stabilizer, drilling fluid surfactants such as foaming agent and emulsifier, as well as high molecular weight polymers such as PAM, starch, lignin, dendrimer, and environment-responsive polymer are introduced. Using the molecular mechanics and molecular dynamics, with the aid of analogy computation of the properties of a single molecule or a system of molecules, such as their structure, conformation, thermo-dynamic characteristics and phase-transition etc., drilling fluids can be studied in these area such as construction of theoretical model of additives, molecular structure design, optimization of synthetic route of additives, presentation of working process of additives, and the analysis of experimental phenomena. Difficulties that may be encountered and the prospect of the application of molecular simulation in the studies of drilling fluid additives are also discussed in this paper. ©, 2015, North China Petroleum Administration Drilling Technology Research Institute. All right reserved. Source


Xiao J.,North Star Times Tower | Fang C.,North Star Times Tower | Zhou S.,North Star Times Tower | Zhang M.,North Star Times Tower | And 3 more authors.
Drilling Fluid and Completion Fluid | Year: 2015

The properties of foam cement are mainly determined by the gas volume fraction of foam. A foam cement slurry with good settling stability was formulated by adding 3%-5% of foaming agent and 0.05%-0.10% of foam stabilizer. The effect of gas volume fraction of foam on the performance of foam cement was studied. An increase in the gas volume fraction of foam increases the viscosity and reduces the filtration rate of the foam cement slurry. The increase in the gas volume fraction also leads to the following results: a linear decrease in the compressive strength of set cement, an increase in gas permeability, and an enhancement of elastoplasticity. Higher compressive strength and better elastoplasticity of set cement can be obtained when the gas volume fraction is controlled around 30%, and the requirements of cementing gas zones can be satisfied. ©, 2015, North China Petroleum Administration Drilling Technology Research Institute. All right reserved. Source

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