Comprehensive Pre-Well Preparation and Collaboration Leads to Record Drilling Performance in Challenging Exploration Well in Sichuan

Lee, Roger; Chang, George K.; Li, Bo; Zhang, Wei; Xu, Jin; Qing, Zhu; Xiang, Xia Jia

doi:10.2118/131302-ms

International Oil and Gas Conference and Exhibition in China 2010

DOI: 10.2118/131302-ms

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Comprehensive Pre-Well Preparation and Collaboration Leads to Record Drilling Performance in Challenging Exploration Well in Sichuan

Roger Lee

George K. Chang

Bo Li

et al.

Abstract: China's Sichuan Province contains prolific gas fields and offers many drilling challenges due to the complex structural geolo gy. The interbedded and abrasive nature of the lithology results in slow drilling penetration rates. Additionally, risk of cavings and stuck pipe limits use of fully stabilized BHAs. Conventional roller cone and PDC bit technologies had been tested and were limited by impact damage and abrasive wear. Offset wells required more than 230 days due to short drilling intervals… Show more

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Cited by 3 publications

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Using Knowledge Management Techniques and Communities of Practice to Drive Performance Improvements in Drilling Applications in Onshore China

Perry

Lee

Yao

et al. 2010

SPE Asia Pacific Oil and Gas Conference and Exhibition

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Onshore drilling in China is very diverse, ranging from wells drilled relatively straightforward in a matter of days to more complex geological environments where drilling can take several hundred days. Recently, this market has increasingly opened up to international operators and service companies, presenting opportunities to introduce new approaches to drilling performance optimization. To best capture the performance potential in any given application it is necessary to gain a detailed understanding of the complex drilling and production environment. This requires an understanding of many important variables, including: ○Macro components—Operators, geographic locations, organizational structure, decision makers, drilling activity, achievable market penetration.○External factors—Technology vendors, products, service organization, market strategies, organizational strengths and weaknesses○Drilling applications—Application breakdown, drilling issues, best practices and opportunities This enables an organization to optimize its technology and service portfolio in a holistic approach to develop system solutions that achieve its objectives and key performance indicators (KPIs), and assist operating companies to overcome drilling challenges, deliver reductions in non-productive time (NPT) and invisible lost time (ILT), and improve overall performance. This paper demonstrates how one organization in China used a proven Knowledge Management process and award-winning KM software to build a knowledge base of expertise in the main onshore China oilfields. The authors will detail the process of knowledge extraction and the methods used to document this experiential knowledge, allowing its communication and collaborative re-use in Communities of Practice across the organization. As a first step in a long-term strategy, the authors will demonstrate through two case-studies how this knowledgebase has been re-used delivering savings to an international operator with a 25% reduction in drill bit consumption. Furthermore, the knowledge base was applied for a domestic operator, realizing drilling time of 38 days less than planned, eliminating unnecessary trips and increasing the overall percentage of productive on- bottom drilling time.

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Using Knowledge Management Techniques and Communities of Practice to Drive Performance Improvements in Drilling Applications in Onshore China

Perry

Lee

Yao

et al. 2010

SPE Asia Pacific Oil and Gas Conference and Exhibition

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Collaborative Engineering Results in Application-Specific Hybrid Bit which Achieves Record Performance in Sichuan Basin

Zhang

Valbuena

Zeng

et al. 2017

Day 2 Wed, November 08, 2017

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China’s Sichuan Basin contains prolific gas fields and presents many drilling challenges due to the complex structural geology. Xujiahe is one of the most challenging formations in the basin. The interbedded and hard, abrasive nature of Xujiahe results in short intervals drilled and low rates of penetration (ROP). Polycrystalline Diamond Compact (PDC) bits have limited drilling efficiency in this formation because impact damage and abrasive wear lead to short intervals drilled and very low ROP. Seven-bladed PDC bits which replaced roller cones were once believed to be the most cost-effective solution. To expedite gas exploration, improve ROP and increase distance drilled in the Gaoshiti-Moxi block, an innovative application-specific engineering drill bit was required. To identify the solution, a cross-functional team from the drilling contractor and the service company conducted extensive technical research into drilling practices. Sophisticated software was used to analyze the rock properties, and to identify the formation drilling problems. Reviews of offset drill bits provided clues to drilling challenges. After a series of technical analyses, an application-specific hybrid bit was designed and tested in this block. Continuous optimization of drilling parameters is implemented by field engineer. The first three trials drilled through this formation, saving two PDC bits and two trips over a 500-meter interval. Post-run review and analysis of the first trials was conducted for further improvement of ROP and interval drilling using drilling parameter and bottomhole assembly (BHA) optimization. One fast run with an average of 45% better ROP was achieved on following runs. This saved seven drilling days and 2.5 runs; an average savings of 180,000USD per well. This paper describes the collaborative solution and detailed technical optimization of hybrid bit performance in Gaoshiti-Moxi Block. Based on the drilling data, economic analysis of this project is also presented. With this cross-functional team’s effort, how this success model may apply on other drilling projects will be also included.

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Integrated Workflow Solutions Deliver Breakthrough in Sichuan Shale Gas Drilling

Tang

Zhuang

et al. 2021

IADC/SPE Asia Pacific Drilling Technology Conference

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The Sichuan shale gas deposits are in remote, mountainous regions and the gas-bearing rocks are deep and in tectonically complicated areas. The plan to make shale gas account for more than 40% of the Chinese total natural gas production by 2040 requires shorter well delivery periods and higher well productions. It is therefore crucial to improve the overall drilling efficiency with the limited rig capability and geological challenges. To improve capital efficiency, a multi-disciplinary approach integrating subsurface understanding with well engineering and drilling practices was implemented. Central to this drilling optimization effort are risk mitigation strategies, utilizing solutions based on robust geomechanical understanding and critical drilling experience reviews, engineered to improve wellbore placement, drilling fluid formulation, and bit and BHA designs. A novel wellbore-strengthening oil-based mud system was implemented to maintain shale stability. A rotary steerable drilling system and reservoir navigation technology were deployed together with the application of specific poly-crystalline diamond compact (PDC) bit design. A new-generation advanced cuttings analysis method was also applied with the lithology, organic matter and fracability of rock could be evaluated in real time to assist the reservoir navigation during the drilling. This integrated solution was deployed in the drilling of 8 ½" holes of Changning Shale gas field. A cross-functional team was formed so that the operator, the drilling contractor and the service company can collaborate closely with expertise across multiple functions and disciplines. Suitable mud weight was provided by the detailed geomechanical analysis to account for the high pore pressure and near bed-parallel drilling conditions. To place the laterals in the thin targeted sub-layer with high TOC, a rotary steerable system (RSS) with azimuthal GR provide not only precise steering and directional controls, but also enable increased reservoir coverage by expanding the lateral section as well as drilling the build and horizontal sections in a single run without BHA trips. The combination of RSS with specialized bits as an optimized bit and BHA system maximizes the steering performance while delivering superior borehole quality by reducing drill string vibration and the minimizing mechanical specific energy, all of which contribute to the overall improvement in the well delivery efficiency. This integrated drilling solution has achieved remarkable results by doubling the average rate of penetration (ROP) to 15.5m/h compared to an offset well on the same pad of 7.4m/h. The well was placed successfully in the targeted zone with a 100% reservoir contact. And the total drilling time was shortened by 40% compared to similar wells nearby. The integrated solution has brought breakthrough to improve the well delivery efficiency in the China shale gas development. This paper describes the integrated workflow solutions and detailed technical optimizations of the 8 ½" section drilling process.

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Comprehensive Pre-Well Preparation and Collaboration Leads to Record Drilling Performance in Challenging Exploration Well in Sichuan

Cited by 3 publications

References 6 publications

Using Knowledge Management Techniques and Communities of Practice to Drive Performance Improvements in Drilling Applications in Onshore China

Using Knowledge Management Techniques and Communities of Practice to Drive Performance Improvements in Drilling Applications in Onshore China

Collaborative Engineering Results in Application-Specific Hybrid Bit which Achieves Record Performance in Sichuan Basin

Integrated Workflow Solutions Deliver Breakthrough in Sichuan Shale Gas Drilling

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