Assessment_of_the_gas_seperation_efficie.pdf - Assessment...

  • No School
  • AA 1
  • 11

This preview shows page 1 - 4 out of 11 pages.

Assessment of a North Rumaila crude oil degassing bank: A Case study By Dr. Ayad Al Chalaby 1 , Ali Salman Majied 2 Abstract An operating 4-stages degassing bank designed for 120 000 std bbl/d production of Basrah regular crude at 600 psi (~42 bar) first stage pressure was investigated to assess the separation efficiency at actual first stage pressure of 420 psi (~29 bar) and a through put of 70,000 std bbl/day. Introduction It is customary to choose the surface utilities for crude oil treatment at an early stage of production based on preliminary reservoir data and production philosophy. Unless a settled reservoir management for a predominant production plateau is established early on, there will be always the possibility of over size or undersize equipment choice to start with thus creating a problem for the operators at the production stations. North Rumaila degassing station DS2 was built by the Russians as part of the second phase of North Rumaila field development project, during the mid seventies of the last century. A post graduate study was set up during the late nineties to assess the performance of the degassing train of that particular station after it has shown some deterioration in production efficiency. Test procedure Fig.1 shows the degassing bank process diagram. Flow rates and composition of the gas exiting each separator was measured simultaneously for all 4 stages during the test. A gas chromatography device type GC-6A and a common turbine flow meter were used for this purpose. 1) Professor emeritus at Iraq university college 2) Lecturer at Basrah Engineering college-Chemical Engineering Dept.
Image of page 1

Subscribe to view the full document.

Fig.1: Station flow diagram for North Rumaila DS2 The feed compositions to the first stage from 3 wells connected to the train are provided by the reservoir department of the operating company at the time and are shown in table 1; Table 1: Feed composition of main 3 wells (at 7900 KPa and 373 K) R -13 R-169 R-199 Mixture * Enthalpy * Component Composition Mole % H (KJ/Kgmol) N 2 0.4905 0.910 1.649 0.633 10,428.44 CO 2 1.0934 1.730 1.650 1.180 -382,034.90 C 1 38.580 38.630 28.850 37.496 12,290.66 C 2 10.590 9.100 9.770 10.440 13,966.66 C 3 8.030 6.980 8.090 7.996 9,218.00 i- C 4 1.040 1.280 0.616 1.024 8,775.72 n- C 4 3.140 4.100 3.289 3.194 9,450.77 i- C 5 1.661 1.650 1.910 1.683 9,218.00 n- C 5 2.344 2.420 2.840 2.402 9,218.00 C 6 + 33.030 33.200 41.140 33.397 8,694.25 MW C 6 + 249 248 240 248 Sp.gr. C 6 + 0.8734 0.8747 0.8585 0.8734 MW Feed 101.05 101.38 116.79 102.90 H Feed 7,914.44
Image of page 2
Test data Tests were performed for both summer and winter seasons with extreme temperature difference, typical for Rumaila desert conditions. Table 2 shows oil levels in all 4 separators and gas flow rates for three readings in winter and one reading in summer at 70,000 BBL/d. Crude Oil tested is dry with minimal water content, thus separators are functioning in two phase mode. A dedicated dehydrator, connected to the second stage was isolated at the time of test for the same reason. Table 2: Measured production of oil and gas flow rates and oil level in all four separators during winter and summer Winter Summer BBL/d 60,000 65,000 70,000 70,000 Stage Gas flow (scm/h) Oil level (%) Gas flow (scm/h) Oil level (%) Gas flow (scm/h) Oil level (%) Gas flow (scm/h) Oil level (%) 1st 35,500 40 38,200 40 42,300 40 47,000 40 2nd 8,100 30 8,600 28 9,600 20 9,000 20 3rd 3,250 25 3,500
Image of page 3

Subscribe to view the full document.

Image of page 4
  • Fall '19

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

Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes