Long-term stability of manganese high-pressure transducers

1974 ◽  
Vol 17 (11) ◽  
pp. 1708-1710
Author(s):  
E. M. Ivanova ◽  
Yu. A. Atanov
Keyword(s):  
High Pressure ◽  
Pressure Transducers ◽  
Term Stability ◽  
Long Term Stability

Systematic Selection of Drill-In and Completion Fluids for Development of the Dvalin HT Gas Field - Part II: Successful Clean-Up Validates Experimental Qualification Approach

2021 ◽  
Author(s):  
Oliver Czuprat ◽  
Kjetil Eriksen ◽  
Duncan Clinch ◽  
Piotr Byrski ◽  
Garbhan Gibbons ◽  
...  
Keyword(s):  
High Pressure ◽  
Drilling Fluid ◽  
Lag Time ◽  
High Permeability ◽  
Vertical Orientation ◽  
Gas Field ◽  
Term Stability ◽  
Long Term Stability ◽  
Set Up

Abstract Formation damage by the drill-in fluid has been identified as a major risk for the Dvalin HT gas field. To ensure the long-term stability and mobility of the mud even after an extended suspension time between drill-in and clean-up of the wells, a novel static aging test under downhole temperature and high pressure was conducted. Experiments have shown that the downhole stability is commonly underestimated when the surrounding pressure is lower than in the field. Thus, a high-pressure cylinder was used in vertical orientation in a heating oven with a pressure pump regulating the pressure up to 200 bar. The reservoir section was drilled with the optimized organo-clay-free oil-based drilling fluid (OCFOBDF) specified in the qualification phase. Tracers in the lower completion were used to identify clean-up from the upper high-permeability streak and the deeper (relatively lower) high-permeability streak. Due to extended wait on weather after drilling and completion of the first of the four wells, the lag time until clean-up was almost 11 weeks (74 days). It could be experimentally shown that the qualified OCFOBDF system weighted with micron sized barite remains mobile without phase separation even after static aging at 160 °C and 200 bar for the maximum estimated lag time between drilling and clean-up of 3 months. The absence of a gas cap in the set-up also better represents downhole conditions in the reservoir section and has shown that it improves the fluid´s stability. The clean-up of the well was successful with a maximum flowrate of 3.0 MM Sm3/d. Analysis of the tracers has proven that clean-up was successful for the entire reservoir section, including the deeper part. It could be concluded that in alignment with the lab tests that the mud fulfilled its requirement to be mobile even up to three months. Because of the superior properties, settling of solids (bridging and weighting material) could be avoided, resulting in no blockage of the (lower part of the) reservoir. The use HPHT aging has been the key to proving the long-term stability and mobility of the combined Drill-In and Completion Fluid. This technique falls outside of current API RP testing practices but is believed to be highly beneficial for qualification of fluids that will be left in the lower completion for long periods, especially in open hole completions under high temperature and pressure.

Study on Comprehensive Measures of Long-Term Stable Dense Oil Reservoir

2013 ◽  
Vol 416-417 ◽  
pp. 1904-1907
Author(s):  
Yong Wang ◽  
Dong Bo Shao ◽  
Hong Jun Lu ◽  
Xiao Bin Lu
Keyword(s):  
High Pressure ◽  
Effective Means ◽  
Water Injection ◽  
Oil Reservoir ◽  
Formation Pressure ◽  
Term Stability ◽  
Long Term Stability ◽  
Pressure Injection ◽  
Tight Reservoir

water injection development is an effective means of tight reservoir to maintain formation energy, and high formation pressure is the basis of reservoir maintain a long-term and stable, therefore, give enough water injection, so as to maintain high pressure is the key to maintain the long-term stability of the reservoir. Liu Maoyuan block Changqing Oilfield is a typical part of tight sandstone reservoir, water injection wells long is not up to the demand of injection, after fracturing, acidizing by invalid injection measures, is not conducive to long-term and stable block. Therefore, research on comprehensive countermeasures of long-term stability of dense oil reservoir. Through the research and development of new antihypertensive drag reduction agent for the overall pressure on block; select suitable for dense reservoir single well stimulation measures and local boosting measures, measures ineffective wells and local abnormal pressure injection is difficult to solve the problem of the cause, to maintain formation pressure. A good result has been obtained by field test, effectively solve the tight reservoir by high-pressure injection resulted in not long-term stability problems, and provides a new idea and reference for solving dense reservoir long-term stability problem.

scholarly journals Combination of Roll Grinding and High-Pressure Homogenization Can Prepare Stable Bicelles for Drug Delivery

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 998 ◽  
Author(s):  
Seira Matsuo ◽  
Kenjirou Higashi ◽  
Kunikazu Moribe ◽  
Shin-ichiro Kimura ◽  
Shigeru Itai ◽  
...  
Keyword(s):  
Drug Delivery ◽  
High Pressure ◽  
Entrapment Efficiency ◽  
Molar Ratio ◽  
High Pressure Homogenization ◽  
Term Stability ◽  
Long Term Stability ◽  
Long Term Storage ◽  
High Entrapment Efficiency

To improve the solubility of the drug nifedipine (NI), NI-encapsulated lipid-based nanoparticles (NI-LNs) have been prepared from neutral hydrogenated soybean phosphatidylcholine and negatively charged dipalmitoylphosphatidylglycerol at a molar ratio of 5/1 using by roll grinding and high-pressure homogenization. The NI-LNs exhibited high entrapment efficiency, long-term stability, and enhanced NI bioavailability. To better understand their structures, cryo transmission electron microscopy and atomic force microscopy were performed in the present study. Imaging from both instruments revealed that the NI-LNs were bicelles. Structures prepared with a different drug (phenytoin) or with phospholipids (dimyristoylphosphatidylcholine, dipalmitoylphosphatidylcholine, and distearoylphosphatidylcholine) were also bicelles. Long-term storage, freeze-drying, and high-pressure homogenization did not affect the structures; however, different lipid ratios, or the presence of cholesterol, did result in liposomes (5/0) or micelles (0/5) with different physicochemical properties and stabilities. Considering the result of long-term stability, standard NI-LN bicelles (5/1) showed the most long-term stabilities, providing a useful preparation method for stable bicelles for drug delivery.

High-pressure synthesis, long-term stability of single crystals of diboron trioxide, B2O3, and an empirical electronic polarizability of [3]B3+

2016 ◽  
Vol 43 (7) ◽  
pp. 527-534 ◽  
Author(s):  
Manfred Burianek ◽  
Johannes Birkenstock ◽  
Philipp Mair ◽  
Volker Kahlenberg ◽  
Olaf Medenbach ◽  
...  
Keyword(s):  
High Pressure ◽  
Single Crystals ◽  
Electronic Polarizability ◽  
Term Stability ◽  
High Pressure Synthesis ◽  
Long Term Stability ◽  
Pressure Synthesis
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