AE12.pdf

Once again at 1700 the choke is opened up to 35

This preview shows page 28 - 30 out of 40 pages.

Once again at 17:00, the choke is opened up to 35 percent and the well starts to bring up more sand from the well bore. This sand is from the well itself. After about 30 min, sand production is declining. Production continues at this level. The first sand produced from the 413 Special Applications of Acoustic Emission Testing F IGURE 26. Case history of an operating well: (a) first day; (b) first night; (c) afternoon and evening of second day; (d) morning of third day. Legend A. Temperature (°C). 1.8 °C + 32 = °F. B. Template wellhead pressure (bar). 1 bar = 1 atm = 14.5 lb f ·in. –2 . C. Choke position (percentage). D. Sand production rate (g·min –1 ). 60 g·min –1 = 1 g·s –1 = 0.13 lb·min –1 . 250 200 150 100 50 0 (a) Sand production rate; template wellhead pressure Temperature; choke position 10:00 11:00 12:00 17:00 18:26 21:47 100 90 80 70 60 50 40 30 20 10 0 Time (h:mm) Tests of system response and performance A B C D 250 200 150 100 50 0 (b) Sand production rate; template wellhead pressure Temperature; choke position 22:00 11:00 11:35 12:32 100 90 80 70 60 50 40 30 20 10 0 Time (h:min) B A C D 250 200 150 100 50 0 (c) Sand production rate; template wellhead pressure Temperature; choke position 13:00 14:00 14:30 15:00 15:20 16:40 00:46 100 90 80 70 60 50 40 30 20 10 0 Time (h:min) B A C D 250 200 150 100 50 0 (d) Sand production rate; template wellhead pressure Temperature; choke position 01:00 06:16 12:15 100 90 80 70 60 50 40 30 20 10 0 Time (h:min) B A C D
Image of page 28

Subscribe to view the full document.

bottom appears at 18:26. Production continues at this level throughout the night to ensure that no sand is being produced from the reservoir. The curve from 22:00 to 11:00 in Fig. 26b shows that the well is clean. It is producing virtually no sand at 11:00. At 11:35, the choke is opened to 40 percent and again the well is producing sand. The opening of the choke causes a spike in the sand measurement, which can be seen quite clearly in the sand production curve. In Fig. 26b, the peaks at 11:35 due to a choke opening at 40 percent show that more sand is coming from the well bore to the surface. From 14:00 to 14:30 (Fig. 26c), sand production is increasing and is probably coming from the reservoir itself — the sand production at this level lasts from around 14:30 to 15:20. After 15:00, a reduction can be seen in the quantity of sand coming to the surface. Figure 26d shows the sand free production rate achieved with this analysis. It is significant that, at about 16:40, the pressure is increasing. This means that the reservoir is consolidating. A reduction in sand produced can be seen and at some point the well will be free of sand. In this case, however, the platform was not able to handle the sand being produced, so the choke opening was reduced from 40 to 35 percent. Sand production was kept to a minimum and was still declining. At a later stage the choke opening on this particular well was increased to 60 percent. The application of acoustic emission monitoring for monitoring sand was found to increase production at several wells by rates of 35 to 300 percent.
Image of page 29
Image of page 30
  • Fall '19
  • The Land, Nondestructive testing, Acoustic Emission, Acoustic Emission Testing

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern