Evaluation of the Effectiveness and Adaptability of a Composite Water Control Process for Horizontal Wells in Deepwater Gas Reservoirs

Abstract

Deepwater gas fields have high bottom water energy and a high risk of seeing water. Higher requirements are put forward for the water control process to control the water effect. This article is based on the actual background and well design of the X gas field in the South China Sea and on three sets of physical simulation experiments and three sets of numerical simulation experiments. An analysis and comparison of the water control effect of a combination of continuous packer, continuous packer and variable density screen tube, and their adaptability evaluation in deepwater gas reservoirs were performed. The results obtained from the numerical and physical simulations are consistent. The experimental results show that the water control process of a continuous packer is mainly based on the water-seeing and water-blocking ability. It is less capable of extending the time to produce water in the horizontal section. However, its water-blocking ability is strong and is able to seal the water spot quickly. It extends the total production time by 12.29% and increases the total gas production by 5.96%; the combined water control process of the continuous packer and variable density screen tube can effectively play their respective advantages of water control. The combination of the continuous packer and variable density screen tube can effectively be advantageous of their respective water control processes, enabling the gas–water interface to advance in a balanced manner, extending the water-free gas recovery period by 11.61%, extending the total gas production time by 15.76%, and increasing the total gas production volume by 13.75%. Both water control processes have good applicability in deepwater gas fields and have certain sand control capability. It is conducive to the one-time completion operation for the commissioning of deepwater gas fields.

Evaluation of the Performance of a Composite Water Control Process for Offshore Bottom Water Fractured Gas Reservoirs

“…The current experiment and process were conducted based on the previous gas reservoir combined water control process study, using the same continuous packer material and model filling process [17]. The interior of the experimental equipment is a square kettle of 50 cm × 50 cm × 50 cm (Figure 1a).…”

Design and Numerical Simulation Study of a Novel AICD for Water Control and Gas Production in Gas Wells

“…Once the wellbore begins to load liquid, the formation back pressure will increase and high-yield gas formations that do not produce water will also be affected, facing the risk and threat of production reduction, which in turn will affect the gas production of the entire gas well. Therefore, in the research process of water control strategies, some scholars have proposed that for unwanted water, chemical and mechanical solutions can be used to avoid unwanted water production in the wellbore design phase, some scholars have proposed that delaying the water in the reservoir from entering the wellbore and controlling the water from entering the wellbore are the key to enhancing oil recovery. , Through annular flow isolation technical means such as external casing packers, swellable packers, the high-permeability section, and the low-permeability section are segmented to reduce the interaction between reservoirs, ,− Al-Khelaiwi and Davies proposed for the first time the use of advanced well completions (AWCs) in water-producing gas reservoirs. The key components of AWC include downhole flow control technology such as ICD, AICD, ICV, and annular flow isolation, which can manage the fluid flow into or out of the length of the wellbore in order to optimize the well performance .…”