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Abstract Introduction: As wells with existing gas lift (GL) installations mature and reservoir pressures decline conventional GL systems often become less efficient. The lack of reservoir pressure makes it difficult to maintain a fluid level at a depth that allows the existing GL system to be effective. The cost of a work over remediation program to redesign and rerun the existing GL system can at times be considered uneconomical. Application: This innovative "Capillary Conveyed" through tubing system can be applied to most wellbores regardless of tubing size or depth. Results, Observations, and Conclusions: The first "Capillary Conveyed GL extension system installation was carried out for a major operator offshore Vietnam in January 2012. The existing GL system was no longer effective. The well was unable to flow and was shut in. After the installation the well took several days to unload and stabilize but then flowed continuously for 60 days at rates that exceeded the operator's expectations. After the initial 60 days production the well started to fluctuate and has since been put on a cyclical production regime. Cumulative production from the well from the date of the GL Extension System installation until May 2012 was 43,000 bbls oil. Project payout was estimated to be 4 days. Significance of Subject Matter: Wells that were once considered uneconomic due to cost, technical challenges and/or accessibility may now be re-evaluated as candidates for this new technology. This innovative through tubing solution has the potential to reinstate flow to wells where the existing GL system is no longer effective. Furthermore the system can be adapted to allow a new through tubing GL system to be introduced into a well that was completed without a gas lifting system. Technical Contributions: Advanced solutions utilizing "Capillary Technologies" provide cost effective production enhancement and improved reserves recovery while maintaining a relatively small foot print. This paper will review a case history where this "Capillary Conveyed" through tubing solution was successfully installed and reinstated flow in a well that was suffering from an inefficient GL system. Field Overview: Block 46/02 (Graphic 1) is located 205km offshore south of Ca Mau, the southernmost land fall of mainland Vietnam, and just north of the joint development area PM-3 CAA. The producing Kekwa oil and gas field in PM-3 CAA is located 15km to the southeast of Song Doc Area (SDA).
Huynh, Nguyen Duc (Petrovietnam Research and Development Centre for Petroleum Safety and Environment RDCPSE) | Manh, Dao Duy (Petrovietnam Research and Development Centre for Petroleum Safety and Environment RDCPSE) | Thanh, Tran Thi Xuan (Petrovietnam Research and Development Centre for Petroleum Safety and Environment RDCPSE)
Abstract In parallel with the great economic value created by oil and gas industry, the environmental protection in oil and gas activities including prevention and response of emergency situation - a cause of environmental pollution at high level, is also attached a special attention. In Vietnam, most of oil and gas exploration and production activities concentrate in the Southeast sea, where marine transportation is very active. Consequently, in this area, the risk of oil spill is particularly high. In order to respond with oil spill immediately and effectively, the establishment of an environmental sensitivity map for the areas that may be impacted is very necessary. This map will constitute basics to select priority areas for response and suitable response measures. Introduction With this objective, the Environmental Sensitivity Map has been established for the following areas:Nearshore area from Ke Ga cape to Ca Mau cape (about 20km from shoreline to open sea); Coastal areas from Ke Ga cape to Ca Mau cape (about 10km from shoreline to inland); Con Dao and Phu Qui Islands. The above-mentioned areas were selected for the map due to the following reasons:Several studies on oil spill show that if oil spill unfortunately occurs in the Southeast sea of Vietnam, spilled oil may drift to and impact directly on the coastal areas from Ke Ga cape to Ca Mau cape, Con Dao and Phu Qui Islands. An outstanding feature of the coastal area is that the topography of most mapping area is relatively flat, low situated comparing to the sea level. The coast areas whose height is lower than 1m are often flooded by tides. Additionally, this area has an interlacing river and channel system, which is influenced by the tidal regime of East Sea. Therefore the potential of intrusion of spilled oil far to inland is very high. Many marine resources, rare and endangered species concentrate in the nearshore. This area is the place where fishing activities occur round the year and the fish-egg and larvae density is high. Many fish and mollusc species of high economic value also live here. Rare and endangered species that are to be protected are found in this marine such as coral, turtle, sea snake and dugong (in Con Dao). The coastal area from Ke Ga cape to Ca Mau cape has rich and diversified natural resources. Typical eco-system of the area is mangrove forest. There are 128 species of mangrove here, among that 38 species have economic value. Mangrove forest is a habitat for many species, a storage area of biological resources, a place for keeping the environmental balance and supplying natural resources for the nearshore area. The species living in the mangrove forest mainly are crab, fish, shrimp, bird, otter and reptile. In the mapping area there are 6 natural reservation areas, which are Binh Chau - Phuoc Buu forest, Bac Lieu sanctuary, Dam Doi sanctuary, Nam Can mangrove forest, Con Dao National forest. This area is characterized by strong and diverse economic activities. Aquaculture, fishing, rice and crop cultivation, salt production are the main activities of coastal residence. Agriculture land takes major part of the mapping area. There is a lot of famous tourism and recreation sites; cultural and historical remains.