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Latest Technological Progress in Drilling and Completion Operations of the Unconventional Reservoir in Xinjiang MaHu Oil Field and Key Suggestions for the Next Steps

Latest Technological Progress in Drilling and Completion Ope...

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2025 International Petroleum technology Conference, IPTC 2025

作者： Hu, Huaigang Xi, Chuanming Ji, Guodong Zhang, Nan Wu, Qiang Zhuo, Lubin Zou, Lingzhan CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center for Oil Gas Drilling and Completion Technology Beijing China Xinjiang Oilfield Engineering Technology R&D Company Limited Karamay China

ISBN: (纸本)9781959025436

Due to the differences in sedimentary environments, compared with the exploitation of unconventional oil and gas resources in the United States and other countries, China has encountered greater difficulties in the drilling and completion processes of unconventional oil and gas. By analyzing the problems faced by drilling and completion in unconventional reservoirs in the MaHu area in recent years, the process of solving the issues and technical progress are summarized to form a technical template for drilling and completion in this area, which can also provide references for the next step to improve the drilling efficiency and reduce development costs. By studying the lateral distribution law of the pore pressure, the placement of the technical casing was optimized to further develop a standard design for the wellbore structure applicable to this area. To adapt to the local environmental protection requirements, high-performance non-sulfonic treatment agents were selected to replace sulfonic treatment agents, and four sets of environmental protection drilling fluid systems were formed. Based on the rock mechanics and field tests, the personalized drill bit is continuously optimized. With the introduction of a rotary steering drilling system and high-performance positive displacement motor (PDM), the rate of penetration (ROP) has been greatly improved. The transformation of horizontal Wells in the target Triassic formation from four types of casing strings with open hole completion + White oil-based/potassium-calcium based polysulfone organic salt drilling fluid to three types of casing strings with 5-inch casing completion + white-oil/potassium-calcium polyamine organic salt drilling fluid, from conventional rotary drilling + roller cone bit to rotary steering system/high-performance PDM +PDC bit, and the horizontal section length increased from 2000m to 2650m. Completion time decreased from an average of 144 days to 72 days. Speak of the Permian formation, the tra

关键词： Oil well completion

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development and Performance Evaluation of Environment-Friendly Self-degradable Polymer Film Workover Fluid System 13th

Development and Performance Evaluation of Environment-Friend...

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13th International Field Exploration and development Conference, IFEDC 2023

作者： Liu, Jian-Quan Gao, Xiang Xing, Li-Jie Ye, Zhi-Lin Jin, Yi Wang, Zhen-Yuan CNPC Engineering Technology R&D Company Limited Beijing China Drilling and Production Technology Research Institute PetroChina Jidong Oilfield Company Tangshan China

ISBN: (纸本)9789819702558

At present, the chelating acid fluid and PRD drilling fluid in the period of well drilling and completion are still applied as the workover fluid in Weizhou Oilfield. Leakage often occurs due to the insufficient plugging ability of chelating acid workover fluid, which will not only lead to the waste of workover fluid but also cause reservoir damage and low oil and gas production. After PRD drilling and workover, it is difficult to break the gel, resulting in plugging and the sharp drop of oil output. The test shows that the lower pay zone has no output, which causes great economic losses and brings great difficulties to the exploitation of oil and gas resources. Aiming at the problems of insufficient plugging performance, poor reservoir protection performance, difficulty in self-plugging removal, and environmental protection of the existing workover fluid system in Weizhou Oilfield, an environment-friendly self-degradable polymer film workover fluid system was developed, and the formula was seawater + 1% Dristemp + 3% film-forming agent + 2% bionic inhibitor + 3% super-amphiphobic agent. The system has high temperature stability, good pressure-bearing and plugging performance and water blocking resistance, and can effectively protect the reservoir. In addition, through the environmental protection performance test, it is determined that the formula has excellent characteristics of safety, non-toxicity, and no environmental pollution. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Chelation

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Application of 3D Geomechanical research for De-Risk and Improve High Pressure and High Temperature Well Drilling

Application of 3D Geomechanical Research for De-Risk and Imp...

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2024 Offshore technology Conference Asia, OTCA 2024

作者： Gao, Xiang Xing, Yangmei Wang, Mengcong Xu, Miao Long, Xuechen Huang, Xingning Shale Gas Research Institute PetroChina Southwest Oil & Gasfield Company Sichuan Chengdu China PetroChina Yumen Oilfield Company CNPC Gansu China Geological Exploration & Development Research Institute CNPC Chuanqing Drilling Engineering Company Limited Sichuan Chengdu China Downhole service company of Xibu Drilling Engineering Company Limited Xinjiang Karamay China

ISBN: (纸本)9781959025030

The CN oilfield is the main block of the X oilfield to increase reserves and production. However, the wells in this area are ultra-deep, and many sets of complex and difficult-to-drill formations are encountered in top-down drilling, which brings significant challenges to the drilling engineering. Based on triaxial and shear experiments, transverse isotropy theory and weak surface criterion, and integrating the mechanical damage under stress unloading and hydration in drilling wells, a borehole stability model under the synergistic effect of stress unloading and hydration has been established, and an analysis of the factors influencing the stability of the borehole of the formation has been carried out. The study shows that stress unloading occurs after drilling. The greater the confining pressure and axial stress, the more significant the shale strength weakening caused by stress unloading, and the magnitude of stress unloading is positively correlated with the degree of mechanical strength weakening. The more developed the laminations are, the easier it is to damage along the laminations. When stress unloading occurs, the weak structural surface acts synergistically with stress unloading, and the higher the degree of shale strength weakening is, the worse the mechanical stability is and the higher the risk of borehole instability. External fluids are prone to intrude along the bedding and promote shale hydration, making the shale mechanically less stable and reducing the borehole's stability. The effect of stress unloading on shale formation collapse pressure mainly occurs in the pre-drilling stage, and the effect of hydration damage on borehole instability mainly occurs in the late drilling stage. Beddings, stress unloading, and hydration affect the borehole stability together. The shale borehole stability model under stress unloading-hydration synergistic effect considers the influence of the three comprehensively. The prediction results align with the drilling

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development and performance evaluation of a high temperature resistant, internal rigid, and external flexible plugging agent for water-based drilling fluids

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Petroleum 2023年第1期9卷 33-40页

作者： Zhe Xu Jinsheng Sun Li Li Kaihe Lv Jingping Liu Zhiwen Dai Xianfa Zhang Zonglun Wang School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company Limited Changping10206China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an710000China

During the drilling process for oil and gas production,a larger number of drilling fluids invade the formation,causing severe formation damage and wellbore collapsing,which seriously hinders the efficient production of deep oil and *** several plugging agents have been developed for efficient fracture sealing in recent years,the development of high-performance plugging agents with self-adaptive ability and high-temperature resistance remain a ***,we report the synthesis of an internal rigid and external flexible plugging agent PANS by reversed-phase emulsion polymerization with nano-silica as the rigid core and poly(acrylamide-co-N-vinylpyrrolidone)as a flexible *** plugging agent has a median particle size of 10.5μm and can self-adapt to seal the microfractures and fractures in the formation,leading to an effective reduction in the filtration loss of bentonite water-based drilling fluid under both low temperature and low pressure(LTLP)and high temperature and high pressure(HTHP)*** addition,compared with the neat nano-silica(500 nm),the sealing efficiency of PANS toward 100–120 mesh sand bed was increased by 71.4%after hot rolling at 180°C.

关键词： Internal rigidity External flexibility Plugging agent Filter loss reduction Plugging performance

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Numerical Simulation of Long-term Stability of Irregular Underground Salt Caverns under Alternating Loads 58

Numerical Simulation of Long-term Stability of Irregular Und...

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58th US Rock Mechanics / Geomechanics Symposium 2024, ARMA 2024

作者： Chang, Zhi Xia, Yan Kun, Dai Liu, Tianen Zhang, Qi Ban, Fansheng CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China NO.1 Drilling Engineering Company BHDC Tianjin China CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China

ISBN: (纸本)9798331305086

The proportion of green energy, such as photovoltaic and wind power, in power generation is increasing year by year. However, green energy often exhibits significant periodic fluctuations. Therefore, it is imperative to construct a large number of compressed air energy storage facilities to meet the daily demand for peak power regulation. Utilizing the dissolved cavity of salt rock layers to build underground salt cavern energy storage presents an economical and reliable solution due to the low permeability and self-repairing properties of salt rock. Nevertheless, most salt rock layers in China contain mudstone interlayers, which pose challenges in accurately controlling the shape of salt caverns during the water injection process within the dissolved cavity. This often results in irregularities, unevenness, and large curvatures near the mudstone interlayer within the cavity shape. Such irregularities on the inner wall of cavities pose a significant threat to long-term stability as they are prone to stress concentration and collapse. The present study establishes a sophisticated three-dimensional geometric model based on the geometry and geological conditions of underground salt caverns in the Hengyang area. Utilizing COMSOL, a numerical simulation is conducted to investigate the long-term creep stability of irregularly shaped salt caverns over a period of 30 years. The impact of salt cavern geometry on long-term stability is quantitatively assessed through key parameters such as volume shrinkage rate, plastic deformation, and stress concentration areas. Copyright 2024 ARMA, American Rock Mechanics Association.

关键词： Caves

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research on Key Materials and Systems of Ultra High Temperature Cement Slurry for Ultra-Deep Wells Cementing

Research on Key Materials and Systems of Ultra High Temperat...

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2024 SPE Asia Pacific Oil and Gas Conference and Exhibition, APOGCE 2024

作者： Xia, Xiujian Yu, Yongjin Qi, Fengzhong Liu, Huiting Qu, Congfeng CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center for Oil and Gas Drilling and Completion Technology Beijing China

ISBN: (纸本)9781959025269

With the continuous deepening of oil and gas exploration and development, the number of ultra-deep and ultra-high temperature wells is gradually increasing in China. The key materials and systems of cementing slurry are crucial for ensuring the safe construction of wells, effective sealing of cement sheath, and safe production of oil and gas. However, the complex working conditions such as ultra-high temperature pose serious challenges to the materials and systems of cement slurry. Focusing on the technical difficulties of ultra-high temperature cement slurry for deep and ultra-deep wells cementing, the cementing retarder, fluid loss additive, stabilizer, and set cement strength retrogression inhibitor with the temperature resistance of 240 ° C were developed through the technical methods, such as optimizing polymer molecular structure, surface modification of powder materials, and synergistic effects between materials. The novel cement slurry system with the temperature resistance of 240 ° C was formed on basis of the above-mentioned four key additives and their supporting materials. Its comprehensive performance was evaluated. The cement slurry system has the resistance to bottom hole circulating temperature of 240 ° C. After curing at 240 ° C, the settling stability of cement slurry can be controlled within 0.05 g/cm3, the API fluid loss is less than 50 mL, and its thickening time can be adjusted arbitrarily within 200 to 600 min, which is linearly related to the test temperature and retarder dosage. The compressive strength of set cement is 45.8 MPa and 55.2 MPa cured at 240 ° C for 2 d and 28 d, respectively. The comprehensive performance of the cement slurry system is excellent, solving a series of problems such as slurry instability, non-adjustable thickening time, uncontrollable water loss, cement stone cracking, and strength decline under ultra-high temperatures. It can meet the requirements of the ultra-high temperature cementing operations and long-term s

关键词： Cement additives

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Pore Pressure Prediction in Deep Complex Formations Based on Well-Seismic Combination 58

Pore Pressure Prediction in Deep Complex Formations Based on...

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58th US Rock Mechanics / Geomechanics Symposium 2024, ARMA 2024

作者： Zixuan, Yang Chenxi, Ye Qian, Wang Wenbao, Zhai Peng, Tan Zhaowei, Chen CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China

ISBN: (纸本)9798331305086

With the development of oil and gas drilling technology, oil and gas exploration and development have moved towards deep to ultra-deep layers. Due to its deep burial depth, deep formations face various challenges such as high temperature, high pressure, and high stress. The prediction of formation pore pressure is a core factor of drilling design optimization and risk prevention. In order to improve the prediction accuracy on the basis of existing pre-drilling formation pore pressure prediction methods, the logging data and actual drilling data of the drilled wells were combined with the seismic data. In this paper, a set of high accuracy pore pressure prediction method based on well-seismic combination are formed by using the interval-controlled interval velocity modeling method and the well-controlled interval velocity correction method. The method is applied to a deep well in Tarim Basin. This well was designed to exceed a depth of 8,000 meters. The predicted pore pressure coefficient of the well is between 1.04 and 1.22 g/cm3. The measured pore pressure coefficient after drilling was between 1.07 and 1.22 g/cm3. Actual analysis has demonstrated the accuracy and reliability of pore pressure prediction, providing support for pre-drilling pressure forecasts. Copyright 2024 ARMA, American Rock Mechanics Association.

关键词： Pore pressure

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research and application of rock mechanics evaluation method for drill cuttings in complex ultra-deep well 58

Research and application of rock mechanics evaluation method...

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58th US Rock Mechanics / Geomechanics Symposium 2024, ARMA 2024

作者： Chang, Long Wang, Haige Zhuo, Lubin Hao, Chen CNPC Engineering Technology R&D Company Limited Beijing China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing China

ISBN: (纸本)9798331305086

Based on the automatic mineral analysis technology of drill cuttings, the evaluation of rock mechanical parameters of drill cuttings in complex ultra-deep wells is carried out, a rock physical model considering formation composition and structural characteristics is established, forming a new method for evaluating rock mechanical parameters based on cuttings measurement while drilling. The evaluation of rock mechanical parameters of complex ultra-deep drill cuttings has been completed for 8 wells. Through parameter calibration, the rock physical model has been improved, and the coincidence rate of rock mechanical parameters interpretation is over 90%. Through the profile construction of key rock mechanics parameters of cuttings while drilling in the well site, the formation pressure analysis while drilling was carried out, and realized dynamic optimization of complex ultra deep well engineering schemes based on rock cuttings measurement while drilling, thus ensuring the safe drilling of complex and ultra-deep wells. Copyright 2024 ARMA, American Rock Mechanics Association.

关键词： Infill drilling

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research on the Formation Gravity Displacement Window

Research on the Formation Gravity Displacement Window

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2023 SPE Caspian Technical Conference and Exhibition, CTC 2023

作者： Tao, Zhenyu Fan, Honghai Liu, Yuhan Ye, Yuguang Zhou, Fei Yin, Wen Sun, Yanshuai Wang, Jinxing China University of Petroleum Beijing China CNPC Engineering Technology Research and Development Company Limited Beijing China Changzhou University Changzhou city China

ISBN: (纸本)9781959025160

Formation gravity displacement refers to the phenomenon of "overflow and leakage" in the same crack due to the difference in density between the drilling fluid and the formation fluid. In order to restrain the leakage accident caused by gravity displacement, this paper studies the formation gravity displacement window, studies the conditions of gravity displacement, and puts forward the corresponding solutions. In summary, this paper develops the wellbore-formation gravity displacement experimental device, carries out gas-liquid gravity displacement critical point experiments, summarizes and analyzes the formation gravity displacement window, and fits the critical point pressure curve of the gravity displacement window based on the results of constant pressure experiments. The existence of formation gravity displacement window was verified through computer simulation. The error between the fitting formula and the measured value is less than 10%, it can reflect the relationship between the gravity displacement window and the density difference, which is of guiding significance for on-site gravity displacement suppression and pressure-controlled drilling. Copyright 2023, Society of Petroleum Engineers.

关键词： Drilling fluids

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Fracturing-flooding technology for low permeability reservoirs:A review

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Petroleum 2024年第2期10卷 202-215页

作者： Nianyin Li Shijie Zhu Yue Li Jingrui Zhao Bo Long Fei Chen Erzhen Wang Wentao Feng Yanan Hu Shubei Wang Chen Jiang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China CNPC Southwest Oil and Gas Field Company Exploration and Development Research Institute Chengdu 610051China CNPC Southwest Oil and Gas Field Company Shale Gas Research Institute Chengdu 610051China Western Drilling Tuha Underground Operation Company Turpan838200China Changqing Downhole Technical Service Company of Chuanqing Drilling Engineering Co. Ltd.CNPCXi’anChina Petroleum Technology Research Institute Petrochina Changqing Oilfield CompanyXi'anChina

The development of low-permeability oil and gas resources presents a significant challenge to traditional development *** address the problem of“no injection and no production”in low-permeability reservoirs,a novel fracture-injection-production integration technology named fracturing-flooding has been proposed by oilfield *** technology combines the advantages of conventional fracturing,water flooding,and chemical flooding,resulting in improved reservoir physical properties,increased injection,replenished energy,and increased oil displacement *** technology is especially suitable for low-permeability reservoirs that suffer from lack of energy,and strong ***-flooding technology has shown significant results and broad development prospects in some oilfields in *** paper analyzes the development status of fracturing-flooding technology from its development history,technical mechanism,technical characteristics,process flow,types of fracturing and oil displacement fluids,and field *** and numerical simulations of fracturingflooding technology are also *** results suggest that fracturing-flooding technology is more effective than conventional fracturing,water flooding,and chemical flooding in stimulating lowpermeability tight reservoirs and improving oil ***,it has a high input-output ratio and can be utilized for future reservoir stimulation and transformation.

关键词： Fracturing-flooding Enhanced oil recovery Low permeability reservoirs Water flooding Injection Chemical flooding Fracturing

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