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Research Papers: Petroleum Engineering

Productivity Model for Water-Producing Gas Well in a Dipping Gas Reservoir With an Aquifer Considering Stress-Sensitive Effect

[+] Author and Article Information
Xiaoliang Huang

State Key Laboratory of Oil and Gas Reservoir
Geology and Exploitation,
Southwest Petroleum University,
Chengdu 610500, Sichuan, China;
School of Petroleum Engineering,
Chongqing University of Science
and Technology,
Chongqing 401331, China

Xiao Guo

State Key Laboratory of Oil and Gas Reservoir
Geology and Exploitation,
Southwest Petroleum University,
Chengdu 610500, Sichuan, China
e-mail: huiti@163.com

Xiang Zhou

Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada
e-mail: zhouxiang@uregina.ca

Xinqian Lu, Chen Shen

Petroleum Systems Engineering,
Faculty of Engineering and Applied Science,
University of Regina,
Regina, SK S4S 0A2, Canada

Zhilin Qi

School of Petroleum Engineering,
Chongqing University of Science and
Technology,
Chongqing 401331, China
e-mail: 2008008@cqust.edu.cn

Jiqiang Li

School of Petroleum Engineering,
Chongqing University of Science and
Technology,
Chongqing 401331, China

1Corresponding authors.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 24, 2018; final manuscript received October 15, 2018; published online November 5, 2018. Assoc. Editor: Ray (Zhenhua) Rui.

J. Energy Resour. Technol 141(2), 022903 (Nov 05, 2018) (9 pages) Paper No: JERT-18-1068; doi: 10.1115/1.4041741 History: Received January 24, 2018; Revised October 15, 2018

The development process of a dipping gas reservoir with an aquifer considering stress sensitivity is complex. With gas development, formation pressure decreases, stress-sensitive effect decreases permeability and porosity, and formation water could flow into the development gas well and gather in the wellbore. The accumulation of water may lead to a lower gas rate. Simultaneously, the gravity action of fluid caused by formation dip angle affects gas well productivity. However, few studies have investigated a deliverability model for a water-producing gas well with a dipping gas reservoir considering stress sensitivity. For this reason, it is important to determine the relationships between gas well productivity and stress sensitivity, formation angle, and water production. In this research, a new mathematical model of deliverability was developed for a water-producing gas well with a dipping gas reservoir considering stress sensitivity. Additionally, a new equation was developed for gas well productivity. By analyzing a typical dipping gas reservoir with an aquifer, the level of influence on gas well productivity was determined for stress sensitivity, formation angle, and water–gas ratio (WGR). The work defined the relationships between gas well productivity and stress sensitivity, formation angle, and WGR. The results indicate that deliverability increases with an increase in formation angle, and growth rate hits its limit at an angle of 40 deg. Due to the influence of formation angle, fluid gravity leads to production pressure differences in gas wells. When bottom-hole flow pressure equaled formation pressure, gas well production was not 0 × 104 m3/d, the angle was large, and gas well production was greater. Deliverability and stress sensitivity hold a linear relationship: the stronger the stress sensitivity, the lower the deliverability of the gas well, with the stress sensitivity index from 0 to 0.06 MPa−1 and the deliverability decrease rate at 37.2%. Deliverability and WGR hold an exponential relationship: when WGR increased from 0.5 to 15.0 m3/104 m3, the deliverability decrease rate was 71.8%. The model and the equations can be used to predict gas deliverability in a dipping gas reservoir with an aquifer considering stress sensitivity. It can also be used to guide the development process for a dipping gas reservoir with an aquifer.

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Figures

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Fig. 1

Water–gas relative permeability curve

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Fig. 2

Relationship between water production and water saturation

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Fig. 3

Gas volume factor and density change with pressure

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Fig. 4

Gas viscosity and Z-factor change with pressure

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Fig. 5

Well F1 productivity equation regression curve

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Fig. 6

Inflow performance relationship (IPR) curve given different dip angles

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Fig. 7

Relationship between dip angle and open-flow capability

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Fig. 8

IPR curves under different stress-sensitive coefficients

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Fig. 9

The relationship between stress-sensitive coefficients and open-flow capability

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Fig. 10

IPR curves given different WGRs

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Fig. 11

The relationship between WGR and open-flow capability

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