Journal of Jilin University(Engineering and Technology Edition) ›› 2019, Vol. 49 ›› Issue (6): 1986-1991.doi: 10.13229/j.cnki.jdxbgxb20180880

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Design and numerical simulation of water restriction device AICD for natural gas exploitation

Wei-ping SHI1(),Xu ZHAO2,Xing-jun HU3,Tian-ming YU3(),Bo-wen LIU1,Yan DUAN1   

  1. 1. College of Mathematics, Jilin University, Changchun 130012, China
    2. Sinopec Research Institute of Petronasleum Engineering，China Petroleum & Chemical Corporation, Beijing 100101，China
    3. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
  • Received:2018-08-23 Online:2019-11-01 Published:2019-11-08
  • Contact: Tian-ming YU E-mail:shiwp@jlu.edu.cn;ytm0406@126.com

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Abstract:

The autonomous inflow control device (AICD) is a downhole flow control device for oil and gas exploitation. It can inhibit the water flow into wellbore, delay water coning and prolong the service life of oil and gas wells. In this paper, an improved AICD with two layer baffles is designed for downhole water flow restriction. The mechanism of AICD was analyzed for the water flow restriction and the gas flow preservation. The gas flow and water flow in AICD are simulated numerically. The pressure field is calculated, and the inlet-outlet pressure difference of water and gas are calculated respectively. A curve fitting method is adopted to obtain the relationship between the pressure difference and the flow rate. Numerical results show that the pressure difference of water flow is much greater than the pressure difference of natural gas, indicating that our AICD has a significant effect for blocking water.

Key words: fluid mechanics, autonomous inflow control device（AICD）, water reservation, numerical simulation, pressure difference

CLC Number: 

  • TB126

Fig.1

Diagram of the AICD"

Fig.2

3D model and mesh"

Fig.3

Pressure contours of water and gas"

Fig.4

Streamlines for water and gas"

Fig.5

Pressure distribution along AB "

Fig.6

Pressure distribution along CD "

Fig.7

Pressure distribution along EF "

Table 1

Flow rate versus inlet-outlet pressure difference"

压力差/Pa 流量q w、q g/(m3·d-1)
5 10 15 20 25 30
水压差Δp w 114 679 446 857 1 014 076 1 967 170 3 069 176 4 326 219
天然气压差Δp g 200.457 521.93 974.534 1 588.21 2 432.40 3 336.04

Fig.8

Pressure difference versus flow rate"

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