A Full Field Downhole Foam Assisted Lift Application For Enhance Gas Recovery

Abstract

Total E&P Indonesie (TEPI) is the main gas producer in Indonesia which produces around 1900 MMscf/d of gas. One of the challenges is to maintain its production plateau under liquid loading issue. Almost half of TEPI gas production comes from liquid-loaded wells, representing 85% of total producing wells in the affiliate. Up until recently, dewatering activity in TEPI is only performed by means of regular offloads; involving substantial means. These operations present specific risks not only for safety and assets but also for environment by flaring of gas through testing barge. A cross functional team has been established to find out innovative solution based on the "Foam Assisted Lift" (FAL) principle and enabling to keep existing DHSV in the well completion. The FAL principle consists in offloading the wells by creating foam down-hole through continuous injection of surfactant to help liquid lifting and gas breakthrough. This paper describes Capillary String Injection System that can be fitted into existing wells, using existing DHSV control line for surfactant injection while keeping its primary safety function as a fail-safe device. The installation equipment includes a modified wireline-retrievable surface-controlled sub-surface safety valve (WR-SCSSV) with capillary tubing attached below it. Injection operates via existing control line of the safety valve to inject chemicals, does not require any further wellhead modification. In addition, this system fits perfectly with the context of mature field; simple, cost-effective, safe and easy to handle.

Predicting the Extended Reach Capabilities of a Water-Hammer Tool with Variable Bypass Control

“…Newman et al (2003) report that residual bending of coil increases the contact forces and effective friction significantly and show that the effective static friction coefficient is s ϭ 0.3 Ϯ 20%. Livescu et al (2014) show that the friction varies significantly depending on the fluid in the well, the well temperature, the sand content, and whether pipe-on-pipe lubricant is used. They report a reduction in the friction coefficient from 0.24 to values in the range of 0.12 to 0.14 based on field trials of a lubricant.…”

“…This paper focuses on a water-hammer tool (Figure 1) that incorporates a self-piloted poppet valve to generate the axial impulse (Kolle 2013). Because the water-hammer effect can be violent, the tool incorporates fluid bypass passages, as shown in Figure 2, that moderate the impulse and allow the user to choose a tool configuration best suited for the job at hand.…”