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Research Papers: Petroleum Engineering

Influence of Sand Production in an Unconsolidated Sandstone Reservoir in a Deepwater Gas Field

[+] Author and Article Information
Fucheng Deng

College of Mechanical Engineering,
Yangtze University,
Jingzhou 434023, China
e-mail: dengfucheng128@163.com

Chuanliang Yan

College of Petroleum Engineering,
China University of Petroleum,
Qingdao 266580, China
e-mail: yanchuanliang@163.com

Shanpo Jia

College of Urban Construction,
Yangtze University,
Jingzhou 434023, China
e-mail: 64686079@qq.com

Shenghong Chen

CNOOC China Limited, Tianjin Branch,
Tianjin 300452, China
e-mail: 121791828@qq.com

Lihua Wang

College of Petroleum Engineering,
Yangtze University,
Jingzhou 430100, China
e-mail: 511655048@qq.com

Liang He

College of Mechanical Engineering,
Yangtze University,
Jingzhou 434023, China
e-mail: 1360412149@qq.com

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the Journal of Energy Resources Technology. Manuscript received December 28, 2017; final manuscript received March 5, 2019; published online March 27, 2019. Assoc. Editor: Ray (Zhenhua) Rui.

J. Energy Resour. Technol 141(9), 092904 (Mar 27, 2019) (11 pages) Paper No: JERT-17-1742; doi: 10.1115/1.4043132 History: Received December 28, 2017; Accepted March 05, 2019

In an unconsolidated sandstone reservoir of a deepwater gas field, due to the reduction of the rock compaction by deepwater, sand production is more likely to occur in the reservoir during production under certain production pressure differences. Therefore, it is important to accurately control the production pressure difference. A theoretical analysis model of sand production was established. On the basis of the model, the critical production pressure difference and the critical flow rate of the sand production were tested through indoor simulated experiments of sand production of three-dimensional full-diameter core. In addition, the critical production pressure difference for the sand production with an open hole completion was verified by means of numerical analysis. The analysis procedures and results are as follows: (1) based on the production test, the gas flow rate and the sand production rate under various production pressure differences were measured. It was found that the critical production pressure difference of core of target block was about 2 MPa, which is lower than the critical sand production pressure difference of core in shallow water or land. (2) A finite element analysis model was established by means of a theoretical analysis on the basis of core mechanics testing, and the analytical model was validated by comparing the experimental model and the theoretical model. A plastic deformation criterion for sand production was proposed. (3) The sand production model of the deepwater reservoir was established based on field parameters. The primary parameters that affect the rock strength were analyzed using the sand production criterion, which was verified by the experimental and numerical simulation results. Analysis results show that the effect of cohesive compared with elastic modulus, Poisson's ratio, and angle of internal friction on sand production is greater. At the same time, it should also pay attention to the influence of the drilling and production process on sand production.

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Figures

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Fig. 1

MSSPI and MPSPI of the reservoir (the straight line indicates the critical sand production value)

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Fig. 2

Rock samples from wildcat well A: (a) Rock specimen schematic, (b) core sample removed from wildcat well A, (c) experimental rock specimen, and (d) rock specimen installed in the experimental instrument

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Fig. 3

Critical pressure difference test device for sand production of a full-diameter core from a gas well. 101, oil storage vessel; 102, axial pressure pump; 103, axial pressure controller; 201, air compressor pump; 202, gas tank; 203, constant temperature and pressure device; 301, piston; 302, autoclave; 303, inlet; 304, outlet; 305, core holder; 306, self-adhesive sealing tape; 307, rubber sealing cushion; 308, full-diameter core; 309, central hole of core; 310, rubber sealing cushion; 401, inlet pressure display and sensor; 402, outlet pressure display and sensor; 403, precession vortex gas flow meter; 404, data acquisition card; 405, data output and display; 501, filter; 502, high-temperature oven; 503, electronic balance.

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Fig. 4

Variation in the pressure and flow rate versus the time during the experiment process

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Fig. 5

Variation in the sand content versus the gas flow rate during the experiment process

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Fig. 6

Model core for the numerical analysis

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Fig. 7

Simulation results of the equivalent plastic strain under different simulation conditions

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Fig. 8

Equivalent plastic strain under different simulation conditions

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Fig. 9

Variation in the rock mechanics properties with depth in the reservoir in the Lingshui Block

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Fig. 10

The model for the stress analysis

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Fig. 11

Numerical simulation results of the influence of the cohesion

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Fig. 12

Plastic strain in the direction of the horizontal minimum principal stress with different cohesions

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Fig. 13

Numerical simulation results of the influence of the elastic modulus

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Fig. 14

Plastic strain data in the direction of the horizontal minimum principal stress with different elastic moduli

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Fig. 15

Numerical simulation results of the influence of the internal friction angle

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Fig. 16

Plastic strain in the direction of the horizontal minimum principal stress under different internal friction angles

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Fig. 17

Numerical simulation results of the influence of Poisson's ratio

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Fig. 18

Plastic strain in the direction of the horizontal minimum principal stress with different Poisson's ratios

Tables

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