A New Dynamic Fracture Plugging Evaluation Method and Its Application in Cementation for Mudstone and Sandstone Formation with Narrow Pressure Range in China South Sea
Jianglin Zhu,
Jiangxiong Wei,
Qijun Yu,
Mingbiao Xu,
Yuwei Luo
Issue:
Volume 7, Issue 2, March 2019
Pages:
33-37
Received:
7 April 2019
Accepted:
29 May 2019
Published:
12 June 2019
Abstract: One of the difficulties in high temperature and high pressure wells and deepwater well cementation in China South Sea is that the pressure range is very narrow. In the drilling or cementation process, the formation is easy to form sharp crack leakage. In general, the traditional simulation of bottom-hole mud or cement slurry leakage is to use the mesh plate or fixed width at a certain temperature and pressure difference. However, when there are wedge cracks in the formation, it will cause repeated "huff and puff" dynamic leakage of fluids. Dynamic leakage puts forward higher requirements for evaluation methods and plugging materials. In view of the problems, a new dynamic fracture plugging evaluation instrument was developed, and the new hydraulic wedge plugging material and matching cementing technology were optimized, which solved the problem of cement slurry leakage and return in China South Sea. The results of this paper have been successfully applied in cementing operations of high temperature and pressure wells and deepwater wells in the China South Sea, effectively solving the problem of hydraulic wedge leakage in sandstone formation cementing with narrow safety pressure window.
Abstract: One of the difficulties in high temperature and high pressure wells and deepwater well cementation in China South Sea is that the pressure range is very narrow. In the drilling or cementation process, the formation is easy to form sharp crack leakage. In general, the traditional simulation of bottom-hole mud or cement slurry leakage is to use the m...
Show More
Innovations and Analysis of Textile Digital Printing Technology
Issue:
Volume 7, Issue 2, March 2019
Pages:
38-43
Received:
10 April 2019
Accepted:
19 June 2019
Published:
29 June 2019
Abstract: This paper reports the evaluation of textile digital printing including our experimental observations in production and this paper encloses the analysis of innovations and unease features of digital printing industry also. Digital printing can make apperal and home textile pattern design more attractive. However, the application of digital printing contains some constrains. Also the application of traditional printing contains some constrains. Technology rapidly improves today so those improvements better the digital printing everyday. These improvements are not yet complete. At this stage, it may be difficult for investors to decide. Sufficient knowledge and experience is needed to invest in digital printing technology. You can obtain this support through counseling and research methods. After sufficient knowledge and feasibility studies, digital printing technology can be invested. Our article evaluates digital printing technology from a wide angle thus we aim to help those who do research on the subject. Digital printing machines have a complex structure. Many disciplines such as electronics, mechanics, chemistry, textiles, fashion and art are intertwined for digital textile printing technology. It is not possible to have all disciplines in one person. Efficient operation of the digital printing machine can only be achieved with a strong team. First of all, you need pattern work designers and equipments capable of feeding digital printing with their work. In the next stage, you will need people to do the calibrations and color work. If you add more, machine operator, electronic and mechanical team, fabric pre and post treatment team, logistic support people will be needed. The size of the team depends on the size of the work. The most problematic parts of digital printing machines are the printheads where the dye is sent to the fabric surface. New developments are taking place every day in this regard.
Abstract: This paper reports the evaluation of textile digital printing including our experimental observations in production and this paper encloses the analysis of innovations and unease features of digital printing industry also. Digital printing can make apperal and home textile pattern design more attractive. However, the application of digital printing...
Show More
