利用Welltec的環空封隔技術，可替代傳統的固井作業，提高井建效率。
編譯：驚蟄
Welltec公司近日宣布，2019年第二季度在剛果首次實施了真正的無固井完井作業?；贛oho North Albian油田持續應用Welltec環形屏障（WAB）所獲得的寶貴經驗，道達爾剛果勘探開發公司在裸眼中利用Welltec環空封隔（WAI）技術，來進行全球首例無固井完井作業。該公司想要通過此舉，進一步推動可膨脹式金屬環空封隔技術的發展。
WAI利用多種膨脹式金屬封隔器，實現了長裸眼的分層隔離，取代了傳統水泥固井的作用，大幅提高了整體建井效率。該技術顯著地減少了尾管或套管與裸眼之間的自由環空，非常適用于需要選擇性生產、增產或堵水的高滲透率層狀油藏開采作業。除了提高作業效率外，WAI這種更簡化的完井作業，還避免了枯竭或超壓儲層在固井過程中伴隨的作業風險。
道達爾剛果勘探開發公司鉆完井經理Ronan Bouget說：“我們公司利用創新技術與方法， 不斷改善Moho North Albian油田開發項目的鉆井作業時效。我們是Welltec WAB技術的早期采用者，在剛果主要石油項目開發期間，該技術確保了層間隔離與環形密封（尾管到地層）。WAI作為全球作業提效的驅動力，可減少鉆井成本支出，同時，在這個非均質性高的碳酸鹽巖油田，它還有助于維持可盈利的產量?！?/span>
“Manfred Bledou領導的Albian油藏團隊、Guillaume Viger領導的完井部門與Welltec公司合作開發了這項技術。得益于WAI的簡易性，我們第一次應用便取得了成功，且沒有出現任何作業問題。我們對井身結構進行了逐步改進，并計劃在后續油井中應用WAI，尤其是那些被確定為高風險的油井?！?/span>
Welltec非洲公司高級副總裁Gbenga Onadeko解釋道：“毫無疑問，WAI技術將改變油氣行業未來的建井方式。我們為與道達爾剛果勘探開發公司的合作感到自豪，這表明我們有能力研發出創新技術，來簡化操作、避免風險、提高作業效率。我們致力于研發與提供突破性的解決方案，幫助客戶優化其資產的管理與開發，WAI技術便是最好的證明?！?/span>
WELLTEC公司的環空封隔（WAI）技術可提供長裸眼的分層隔離，顯著減小尾管（套管）與裸眼之間的自由環空。該技術適用于滲透性差異大的層狀油藏，因為它們需要進行選擇性的開發、增產或堵水。
Welltec公司根據ISO 14310 V6至V3漏失標準設計與測試了WAI的適用范圍，結果可靠。通過鉆機泵設備為井筒施加壓力，WAI可膨脹式金屬滑套會被激活，迅速膨脹，形成保障。利用一系列符合要求的彈性密封件，在全周向金屬與巖石接觸翼片的支撐下，可防止密封件在高壓差下擠壓變形，從而實現對裸眼內徑的密封。
技術應用
- 在層狀油藏段，可替代注水泥固井；
- 選擇性生產，選擇性增產，堵水；
- WAI適用于裸眼段、下套管段以及惡劣環境。
技術特點
- 堅固耐用，全焊接，金屬結構；
- 可膨脹性保證，膨脹能力強；
- 在全膨脹范圍內，可承受恒定的高壓差；
- 不會提前膨脹，符合NACE標準。
技術優勢
- 可在部署期間旋轉，使尾管能夠在惡劣井況下順利下入至井底；
- 超薄的外徑，可在部署期間大排量循環；
- WAB擁有快速坐封的特性，縮短了投產時間；
- 擁有高速循環能力，全通徑。
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Welltec has announced the first deployment of a truly cementless completion in the Republic of Congo during the second quarter of 2019. Building on the experience gained through the continuous deployment of the Welltec Annular Barrier (WAB) in Moho North Albian field, which was awarded the first quarter of 2017, Total E&P Congo has pushed the boundaries of Metal Expandable Annular Sealing technology even further by deploying the world’s first cementless completion using the Welltec Annular Isolation (WAI) in open hole.
The WAI uses multiple metal expandable packers to provide long length open hole zonal isolation to replace the functions of traditional cement, leading to significant gains in efficiency in the overall well construction process. It significantly reduces the free annulus space between the liner/casing and the open hole which can be beneficial in highly layered reservoirs of varying permeability where selective production, stimulation or water shut off is required. In addition to the efficiency gains, the simplified well completions operations enabled by the WAI eliminated multiple operational risks associated with the cementing process in depleted and over-pressured reservoirs.
“Total E&P Congo have utilized innovative technologies and methods to continually improve the drilling curve on the Moho North Albian field development project,” says Ronan Bouget, the Drilling and Completions Manager of Total E&P Congo. “We were early adopters of Welltec’s WAB technology which has assisted in ensuring zonal isolation and annular sealing (liner to formation) during the development of our major oil project in the Republic of Congo. The WAI was deployed as part of the global efficiency drive to reduce drilling expenditure whilst maintaining the beneficial productivity index in this highly heterogenous carbonate field. Our Albian Asset team led by Manfred Bledou and the completion department led by Guillaume Viger worked with Welltec to develop the technology. The simplicity of the WAI enabled us to successfully deploy the technology the first time without operational issues. We delivered a step change improvement in our well construction record and plan to deploy the WAI in subsequent wells – especially those identified as high-risk.”
“The WAI technology will without doubt transform how future wells are constructed in the industry,” explains ‘Gbenga Onadeko, senior V.P., Welltec Africa. “We are proud of this collaboration with Total E&P Congo to demonstrate our ability to deploy game-changing innovation that can simplify, eliminate risks and enhance operational efficiency. This world-first deployment of the WAI technology is very important as we progress our mission – to develop and deliver ground-breaking solutions which enable our client to optimize the management and development of their assets.”
Introduction
The Welltec? Annular Isolation (WAI) provides long length open hole zonal isolation, significantly reducing the free annulus space between the liner (casing) OD and the open hole ID. The removal of this annular space can be beneficial in highly layered reservoirs of varying permeability, where selective production, stimulation or water shut off is required.
At Welltec, we design and test the WAI range (Welltec Annular Isolation) in accordance to IS0 14310 V6 to V3 leak criteria.
The WAI metal expandable sleeve is hydraulically expanded quickly, under full surface control via the application of well bore pressure using the rig pumps. Sealing on the ID of the open hole is achieved via a series of compliant, elastomeric seals, backed up by full circumferential metal to rock contact fins that prevent seal extrusion under high differential pressure.
APPLICATIONS
- Cement replacement across laminated & highly layered reservoir sections
- Selective production
- Selective stimulation
- Water shut off
- WAI can be incorporated within open hole, cased hole and hostile environments
FEATURES
- Rugged, all welded, metallic construction
- Expansion assurance
- High expansion capability
- Constant, high pressure ?p over full expansion range
- No premature expansion
- NACE compliant
BENEFITS
- Rotatable during deployment enabling liner to TD in challenging environments
- Slim OD allows for high rate circulation during deployment
- Rapid set nature of WAB reduces time to production
- High rate circulation capability
- Full bore – as per casing / tubing
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