SPE-8025-1979.pdf - UNSOLKXTEE ~MAR 51979 ABSTRACT A NODAL...

This preview shows 1 out of 3 pages.

-— –- - ABSTRACT UNSOLKXTEE’)‘ ~ MAR 51979 A NODAL APPROACH FOR APPLYING SYSTEMS ANALYSIS TO THE FLOWING AND ARTIFICIAL LIFT OIL OR GAS WELL . . by Joe Eduardo Proano ~~rmit E, Ezown . A nodal and new approach is presented for applying systems analysis to the complete well system from the outer boundary of the reservoiz to the sand face, across the perforations and com- pletion section to the tubing intake, up the ~~bing string in- cluding any restrictions and down hole safety valves, the surface choke, the flow line and separator. . Fig. 1 shows a schematic of a simple producing system. This system consists of three phases: .t] (1) F1OW through porous medium. (2) Flow through vertical or directional conduit. (3) FIow through horizontal pipe. Fig. “2shows the vari”ouspressure losses that can occur in the sys- tem from the reservoir to the separator. Beginning from the reser- . voir, these are noted as: API = ~r - Pkfs = AP2 = Pwf~- Pwf = AP3 = PUR - PDR = Pressure Pressure Pressure Loss in Porous Medium Loss Across Completion Loss Across Regulator, or Tubing Nipple Choke AP4 = PUSV- PDSV = AP5 = pwh - PDSC = AP6 = PDSC- PSEP = AP7 = Pwf - Pwh = AP8 = Pwh - P~3p = . Pressure Loss Across Safety Valve Pressure Loss Across Surface Choke Pressure Loss in Surface Flow Line Total Pressure Loss in Tubing String Which Includes AP3 and AP4 Total Loss in Surface Flow Line Includ- ing Surface Choke
Image of page 1

Subscribe to view the full document.

2“ The v::‘.OUSwell configurationsmay vary from the very simple system of Fig. 1 to the more complex system of Fig. 2, or any Com- bination thereof, and present day completionsmore realistically include the various configurationsof Fig. 2. This paper will discuss the manner in which to interrelate the various pressure losses. In particular, the ability of the well to produce fluids willbe interfacedwith the ability of the piping system to take these fluids. The manner in which to treat the effect of the various componentswill be shown by a new nodal concept. In order to solve the total producing system problem, nodes are placed to se.,znent the portion defined by different equations or correlations. Figure 3 has been prepared showing locations of the various nodes. This figure is the same as Figure 2 except only the node positions are shown. The node is classified as a functionalnode when a pressure differential exists across it and the pressure or flow rate response can be represented by some mathematical or phys- , ical function. -, Node 1 represents the separator pressure which is usually reg- ulated at a constant value. There are two pressures that are not a functionof flow rate. They are F= at Node 8 and PSEP at Node 1. For this reason, any trial and error solution to the total system problem must be started at Node 1 (P SEP), Node 8 (~r),or both Node 1 and 8 if an intermediatenode such as 3 or 6 is selected as the solution node. Once the solution node is selected, the pres- sure drops or gains from the starting point are added until the solution node is reached. Example problems are worked to show the nodal system approach. For example, the flow rate possible
Image of page 2
Image of page 3
You've reached the end of this preview.

{[ 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