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Deepwater drilling fluid hydrate inhibitors

Author: BaiXiaoDong
Tutor: ZhuLin；HuangJinJun
School: Southwest Petroleum Institute
Course: Applied Chemistry
Keywords: Gas hydrate Hydrate inhibitor Synthesis Molecular characterization Deep-water drilling fluid system
CLC: TE254.4
Type: Master's thesis
Year: 2005
Downloads: 748
Quote: 4
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Abstract


The harsh operating environment of offshore deepwater drilling, the complex operating conditions, one of which is drilling fluid (mainly water-based drilling fluid) is easy to form gas hydrate. There is a serious threat to the presence of hydrate drilling safety and completion efficiency, it could be clogging the upper annular BOP and valve / kill line, anti-oil well pressure monitoring, limit the drillstring activities, resulting in the deterioration of drilling fluid properties, clogging tracheal catheter riser. This study to solve the problem of deep-water drilling fluid to form a hydrate blockage, gas hydrate inhibitors HBH, and the establishment of a hydrate inhibition of drilling fluid systems for deepwater drilling for deepwater oil and gas resources exploration and developed to provide technical support and reserves. On the basis of literature research, hydrate formation mechanism were studied, in order to determine the hydrate inhibitors functional group and the synthesis of monomer preferred. By emulsion polymerization, the best synthesis conditions, the development of gas hydrate kinetic inhibitors HBH through orthogonal experiment. By infrared spectroscopy, nuclear magnetic resonance spectroscopy and gel permeation chromatography made the characterization of molecular structure. Established a set of evaluation of gas hydrate inhibitor performance practical method for the (THF testing method), the design of the experimental apparatus to simulate the of tetrahydrofuran feeding hydrate formation process. The principle of the method is simple, easy to operate, less time-consuming, in foreign countries have begun to use. Evaluation of water-based drilling fluid commonly used treatment agent, such as: clay, NaCl, CaCl 2 , the MgCl 2 , PEG, XY-27, FCLS, the CMC and the PSC for natural gas hydrate formation. : Clay hydrate formation play a catalytic role; inorganic salts NaCl, the CaCl 2 , the MgCl 2 at high concentrations a disincentive; organic treatment agent PEG, XY- 27, FCLS, CMC, PSC formation of hydrates little effect (normal increase in the amount of range). Finally, based oilfield services company of China National Offshore Oil widely used water-based mud, together with the development of hydrate inhibitors HBH for deepwater drilling hydrate inhibition of water-based drilling fluid system and formula. Evaluation of the hydrate inhibition, rheology and fluid loss control of the system. HBH mechanism of inhibition of hydrate preliminary study by experiments show that the rate of hydrate inhibitors longer the molecular chain, increasing the risk of hydrate nuclei chain entanglements, thus speeding up the hydrate crystals aggregation, inhibition is poor; moderate molecular weight inhibitors is relatively easy to enter the cage-type structure of the hydrate, preferably suppressed, the optimum molecular weight of about 200,000.

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CLC: > Industrial Technology > Oil and gas industry > Drilling engineering > Wash wells, cementing,completion,reservoir damage and prevention > Use and disposal of drilling fluid > Chemical processing agents, additives
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