检索结果-内蒙古大学图书馆

SSrN 2024年

作者： Song, Hanxuan Guo, Jixiang Wyclif, Kiyingi Wang, Xiwen He, Aiguo Li, Jiao Wang, Li Chen, Xiangwei State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China Unconventional Petroleum Research Institute China University of Petroleum Beijing102249 China CNPC Engineering Technology R&D Company Limited China

during the ultra-deep well drilling process, drilling fluid tends to remain in the casing, contaminating it and affecting the progress of completion engineering. To address this issue, a screening method was employed to select non-ionic surfactants, with fatty alcohol polyoxyethylene ether (AEO-7) being chosen among various types. To overcome the temperature resistance issue of AEO-7, Phthalic anhydride (PA) was introduced into AEO-7, and neutralization reaction with NaHCO3 was carried out to synthesize a novel surfactant (SEO). High-temperature and high-pressure precipitation testing equipment and high-temperature cleaning equipment were set up to study the temperature-resistant cleaning performance of SEO. results indicate that surfactant SEO maintains good solubility in high-temperature environments in the solution through ionic bonding. At 200°C, the cleaning efficiency of SEO solution for different types of drilling fluid residues exceeds 95%. Additionally, SEO adsorption on metal surfaces can inhibit Cl- corrosion. Combined with micro-mechanism characterization results, SEO can disperse solid particles, adsorb organic phases, reduce interfacial tension, and achieve efficient cleaning. Field experimental results show that the surface tension retention rate of well-flushing fluid after cleaning is 95.8%, with a solid particle content of 5.4g/L, meeting onsite requirements and broad application prospects. © 2024, The Authors. All rights reserved.

关键词： Surface active agents

来源：评论

学校读者我要写书评

暂无评论

Well depth monitor software design based on laser distance measuring device

Well depth monitor software design based on laser distance m...

引用

Abu dhabi International Petroleum Exhibition and Conference 2020, AdIP 2020

作者： Han, Haochen Hu, Yongjian Zhang, Yong Sun, Qi Sun, Chengqin Fang, Zhimeng Chen, Haoweu CNPC Engineering and Technology R&D Company

ISBN: (纸本)9781613997345

Well depth is one of the most valuable parameters in drilling engineering. Commonly well depth is calculated by the absolute difference in height based on the revolution of drawwork sensor, which is a pulse encoder or incremental optical encoder. Both encoders have complicated calibration process, and the measurement is easily disturbed. different from the traditional indirect measurement from the drawwork sensor, the direct measurement provided by laser distance device can simplify the process and decrease the systemic error. The principle of the measurement is to calculate the distance by the product of the atmospheric refraction coefficient and the speed of light. In our design, we fixed the laser distance device on the hook and placed the reflector under the crown to measure the height variant. Modern industrial laser distance device with high accuracy can finish multiple measurements per unit time and calculate the average to reduce the measurement error effectively. The well depth measurement system software based on laser distance measuring device can shorten and simplify the calibration process or even realize automatic calibration. The laser distance measuring device can be used effectively in the severe weather, such as strong winds, and minimize the error caused by manual operation. We completed the optimization of laser distance sensor and selected Sick dL 100 as the main laser sensor, as well as a laser measurement prototype in lab. After thousands of trials and errors, it turns out to be applicable. In order to be compatible with the new well depth measurement system, we developed a corresponding software *** Framework and WPF. With the help *** framework and WPF, UI and core codes of the software are separated in physical isolation, which can improve the development efficiency and make preparation for further extension and optimization. The software supports portal communication and ethernet, which can connect with the laser distance device conv

关键词： Signal encoding

来源：评论

学校读者我要写书评

暂无评论

research on construction and operation parameters of an underground oil storage in depleted salt caverns in the east of China 82

Research on construction and operation parameters of an unde...

引用

SPE Europec featured at 82nd EAGE Conference and Exhibition, EUrO 2021

作者： Jin, Fu Xi, Wang Mingming, ding Guobin, Yang Shunyuan, Zhang Bingshan, Liu Chen, Chen CNPC Engineering Technology R&D Company Ltd. China China National Oil and Gas Exploration and Development Company Ltd. China

ISBN: (纸本)9781613997918

The crude oil price has been keeping at a low level in recent years, which made China's government put more efforts in the development of underground oil storages in depleted salt caverns. Under the initiative of "the Belt and road", a more concrete concept which is "the Silk road Economic Belt and the 21st-Century Maritime Silk road"successfully connects Jiangsu Province in the east of China. Consisting of 20 depleted caverns, Huai'an project that is still under planning is one of the most successful examples that turn depleted salt caverns into underground crude oil storages in China. Each cavern takes up 24×104m3, while the project totally takes up 480×104m3. TdMA algorithm was adopted to solve the heat exchange model of oil, brine and surrounding rocks, revealing the relationship between temperature and cavern pressure. Salt rock safety factor, salt cavern shrinkage ratio, axial stress and ground subsidence were taken into consideration to establish a 3- dimension salt rock creep model for 19 depleted salt caverns, so that the caverns' shapes were optimized. Hydrodynamics models were used to determine the oil's flow rate into and out of a 1000m deep cavern whose thermal field was simulated by software to reveal the temperature limit of oil and brine. due to geothermal gradient and continuous heat transmission, the average temperature of oil and brine goes up from 35°C to 44.3°C within 7 years, while the inner pressure goes up from 12.96MPa to 21.93MPa in a depleted salt cavern. Salt creep ratio decreases as oil is stored in underground caverns for a longer period. Salt is hardly penetrated by oil, while the temperature change has a strong influence on caverns' internal pressure. The thermal expansion factor and compressibility coefficient of crude oil and brine are both crucial to the temperature's effect on internal pressure. Caverns that have larger segments in their uppermiddle or middle parts are more stable and resistant to salt creep than those that have l

关键词： Crude oil

来源：评论

学校读者我要写书评

暂无评论

A rapid evaluation technique of sweep efficiency for tight oil reservoir recovered with gas flooding

A rapid evaluation technique of sweep efficiency for tight o...

引用

SPE/AAPG/SEG Unconventional resources technology Conference 2020, UrTeC 2020

作者： Mu, Lingyu Liao, Xinwei Zhao, Xiaoliang Zhang, Jingtian Zou, Jiandong Chu, Hongyang Shang, Xiongtao Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

due to the special micro-pore structure and the seepage law of tight reservoirs, the research on the development of tight oil is quite different from conventional reservoirs. For the tight oil reservoirs recovered with the gas injection, the gas breakthrough is an eternal theme as a result of the preferable mobility of the gas and the strong heterogeneity of the reservoirs. It is extremely important to evaluate the sweep efficiency. Based on the stream-tube method and the non-darcy theory, this paper establishes a rapid evaluation technique of sweep efficiency considering the mechanism of the gas flooding and the seepage characteristics of the tight oil reservoir. Firstly, the relative permeability under different miscible condition are determined through the revised Coats model. Besides, the Todd-Longstaff model is adopted to describe the varying viscosities of oil and gas. Secondly, the stream-tube model of the inverted nine-spot well pattern with fracture is established. Next, the seepage equations of oil and gas in the stream-tube is constructed considering the threshold pressure and the variation of the viscosity and relative permeability. Then, the sweep efficiency is obtained by solving these equations. Furthermore, an application example for evaluating the sweep efficiency is presented and sensitivity analyses are conducted to study the effect of the viscosity, pressure difference, fracture permeability and well spacing taking the case of a real tight reservoir. Through the analyses, it can be concluded that the factors have remarkable impacts on the sweep efficiency. The threshold pressure increases the resistance and reduces the flow rate, leading to a lower sweep of the injected gas. Even worse, the excessive threshold pressure results in that the effective displacement cannot be established. The fracture greatly shortened the breakthrough time and result in early channeling of the injected gas. The sweep efficiency is improved through the increase of the

关键词：

来源：评论

学校读者我要写书评

暂无评论

Micro-Nano Polymer Microspheres as a Plugging Agent in Oil-Based drilling Fluid

SSRN

引用

SSrN 2023年

作者： Zhao, Zhen Sun, Jinsheng Liu, Fan Cheng, rongchao Bai, Yingrui Wang, ren Wang, Jintang Geng, Yuan Jin, Yeliang Ma, Zhihu CNPC Engineering Technology R&D Company Limited Beijing102206 China Research Institute of Petroleum Exploration &Development Beijing100083 China China Department of Petroleum Engineering China University of Petroleum Beijing China

The wellbore instability of shale formations with micro fractures was mainly ascribed to drilling fluid invasion and pressure transmission during drilling using oil-based drilling fluids (OBdF). Nano-plugging agents or micro-plugging agents at present only match a narrow size range of nanopores or microcracks. Plugging agents with good suitability to multidimensional fractures used in OBdF are lacking. This paper synthesized micro-nano polymer microsphere dispersion (PMd) with a solid content of 30% through inverse emulsion polymerization. PMs had good wettability for water in the oil environment. The filtration of the emulsion with 4% PMd dropped the filtration through 0.1~3 μm filters to within 14 mL while the emulsion with 1% CaCO3 only plugged the filter with a pore size of 3 μm. Hydrophilic PMs with a wide size distribution have excellent suitability with multi-scale pores or cracks. PMs could reduce the filtration of OBdF after aging at 120 and 150℃ without significantly influencing their rheology and electrical stability. Based on darcy’s law, the HTHP mud cake permeability calculated decreased by half with the addition of PMd at 120 and 150℃. Moreover, the addition of PMd could decline the disc HTHP filtration by 100~50% when the disc diameter was 5~120 μm respectively. Compared with CaCO3, the PMd showed superior plugging performance and self-suitability when plugging 5~120 μm discs. Micro-nano PMs could interact with organic clays through hydrogen bonds to form thinner and denser mud cakes. They could also form hydrogen bonds with the formation surface. PMs could enter, aggregate and arrange tightly at multi-scale pores or cracks owing to their wide size distribution. In addition, they formed a dense plugging layer and prevent the filtration from invading the formation. The PMd with good compatibility, suitability and plugging performance has a promising application prospect in shale oil and gas exploration. © 2023, The Authors. All rights reserved.

关键词： Emulsification

来源：评论

学校读者我要写书评

暂无评论

Application of Multifunctional Wellbore Cleaning Fluid in the removal of residual drilling Fluids in Ultra-deep Wells: research Progress and Prospects

SSRN

引用

SSrN 2024年

作者： Song, Hanxuan Guo, Jixiang Li, Jiao Zhang, Shiling de Oliveira, Adilson Julio Soares He, Aiguo Unconventional Petroleum Research Institute China University of Petroleum Beijing102249 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

developing ultra-deep wells presents a significant challenge in current petroleum exploration and production. Ensuring the cleanliness of the wellbore is a crucial aspect of safeguarding the development process. removing contaminants from residual drilling fluids is vital to ensure unobstructed production pathways in ultra-deep wells, thereby achieving secure operational environments. This paper analyzes the primary residual components of drilling fluids in post-drilling operations of ultra-deep wells. It also explores the synergistic damaging mechanisms of residual drilling fluids on casing-ion corrosion and abrasive wear. Moreover, we summarize the technical challenges involved in the flushing and treatment of ultra-deep wellbores. drawing from global developments in flushing fluids for ultra-deep wellbores, this study investigates the performance and on-site applicability of various flushing fluids. The findings indicate that the flushing of ultra-deep wellbores necessitates the development of fluid systems tailored to different well conditions and residual components. Adaptable flushing fluids exhibit suitability across diverse operational scenarios. Furthermore, understanding the mechanisms of flushing fluids provides novel perspectives for their future development. Presently, research on the mechanisms of flushing fluids predominantly relies on experimental observations and theoretical simulations. This study analyzes the future directions of flushing fluid research by summarizing and synthesizing existing technical challenges. In conclusion, as discussed in this study, the tailored technology for flushing wellbores lays a fundamental groundwork for large-scale flushing and treatment of ultra-deep wells, thus offering a foundational contribution to the field. © 2024, The Authors. All rights reserved.

关键词： drilling fluids

来源：评论

学校读者我要写书评

暂无评论

research on the Pollution and damage Mechanism of drilling Fluid on Casing during Ultra-deep Well drilling Process

SSRN

引用

SSrN 2024年

作者： Hanxuan, Song Shiling, Zhang Xiangwei, Chen Kiyingi, Wyclif Jixiang, Guo ruiying, Xiong Li, Wang Unconventional Petroleum Research Institute China University of Petroleum Beijing102249 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

In drilling ultra-deep wells, the degree of casing/tool damage decreases with an increase in bottom hole temperature, and the casing/tool is least damaged within a temperature range of 150-180°C. The wettability of drilling fluid on the casing/tool surface increases with an increase in the degree of roughness. Oil-based drilling fluid have the strongest adhesion contamination on casing/drilling tools. Polysulfonated potassium drilling fluid and ultra-micro drilling fluid have the most potent erosion damage on casing/drilling tools. By analyzing the damage mechanism, it was established that the damage was mainly dominated by the abrasive wearing from solid-phase particles in concert with corrosion ions in drilling fluid, with solids producing many abrasion marks and corrosive ions causing a large number of pits. © 2024, The Authors. All rights reserved.

关键词： Tribology

来源：评论

学校读者我要写书评

暂无评论

Modes of multi-mechanistic gas diffusion in shale matrix at varied effective stresses:Observations and analysis

引用

Petroleum Science 2023年第5期20卷 2908-2920页

作者： Tian-Yu Chen Yan-Yu Hao derek Elsworth Hong-Ming Zhang Zhi-Ming Hu Guang-Lei Cui Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines School of Resources and Civil Engineering and Key Laboratory of Liaoning Province on Deep Engineering and Intelligent TechnologyNortheastern UniversityShenyang110819LiaoningChina National Energy Shale Gas R&D(experiment)Center Langfang065007HebeiChina Department of Energy and Mineral Engineering EMS Energy Institute and G3 CenterPennsylvania State UniversityUniversity ParkPA16802USA Research Institute of Petroleum Exploration&Development PetroChina Company LimitedBeijing100084China

Gas diffusion in the shale matrix has a dominant effect on late-stage production from shale gas ***,adequate research on the mechanisms and contributions of gas diffusion for varied pore size populations in shale matrix under recreated in situ stress is *** report gas-diffusion measurements under constant in situ stress but variable gas pressures for contrasting non-adsorbent(helium(He))and adsorbed(methane(CH_(4)))gases to investigate the impact of effective stress on the evolution of dominant mechanisms of *** intact sample replicates true pore-network topology and diffusion *** integrated diffusion model is proposed that combines the effects of slip flow,Knudsen flow,and surface diffusion to constrain the evolution of these flow regimes and their respective contributions to the observational ***,a probability density function(PdF)is employed to separate the gas content distributions of macropores and micropores from the total gas content and to investigate gas contributions in various *** results reveal that the diffusion coefficients of both He and CH_(4) in macropores and micropores increase with gas pressure but decrease with increasing effective *** diffusion coefficients of He and CH_(4) are different in macropores but remain nearly the same in *** diffusion coefficients of slip flow and surface diffusion increase with decreasing effective stress except for CH_(4) diffusion in the micropores,while the evolution of Knudsen diffusion shows the opposite *** flow plays a dominant role in He and CH_(4) diffusion within macropores(pore size 45 nm).Knudsen diffusion gradually becomes significant for He diffusion in the micropores(pore size 4 nm),conversely,for CH_(4) diffusion in the micropores,surface diffusion becomes *** to gas production from reservoirs,the contributions of the micropores will increase gradually with the duration of gas recovery,indicating the significan

关键词： diffusion coefficient In situ stress Varied pore types diffusion mechanisms Gas-content contributions

来源：评论

学校读者我要写书评

暂无评论

The biodiesel-based flat-rheology drilling fluid system

引用

Petroleum Exploration and development 2022年第1期49卷 200-210页

作者： JIANG Guancheng SHI He HE Yinbo Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China MOE Key Laboratory of Petroleum Engineering China University of Petroleum(Beijing)Beijing 102249China CNPC Engineering Technology R&D Company Limited Beijing 102206China

As the base oil of the current flat-rheology synthetic drilling fluid is high in cost and not renewable, the biodiesel-based flat-rheology drilling fluid with low-cost, environmental protection and renewable advantage was studied. Based on the optimization of raw materials, a cheap, environment-friendly biodiesel of soybean oil ethyl ester with good fluidity at low temperature was selected as the base oil. By selecting high oil-water ratio and introducing cationic surfactant into the auxiliary emulsifier, the thickening of biodiesel-based emulsion caused by hydrolysis and saponification after high-temperature aging was effectively eliminated. The organoclay prepared with cationic modifier of hexadecyl trimethyl ammonium chloride was used to improve the rheologic properties, stability and fluid loss of the drilling fluid while preventing low-temperature thickening. A flat-rheology modifier was synthesized with dimer fatty acid and cocoanut fatty acid diethanolamide, which could form strong network structure in the biodiesel-based drilling fluid to adjust effectively rheological properties of the drilling fluid. A biodiesel-based flat-rheology drilling fluid system with the density of 1.2 g/cm^(3) has been formulated which has constant rheology in the temperature range of 2-90 ℃, temperature tolerance of 160 ℃, seawater salinity tolerance of 5%, shale cuttings tolerance of 10%, and is environmentally friendly.

关键词： biodiesel flat-rheology drilling fluid emulsifier organoclay rheology modifier environment friendly deep water drilling

来源：评论

学校读者我要写书评

暂无评论

Transformation mechanism of muddy carbonate rock by the coupling of bioturbation and diagenesis:A case study of the Cretaceous of the Mesopotamia Basin in the Middle East

引用

Petroleum Exploration and development 2021年第6期48卷 1367-1382页

作者： YE Yu LI Fengfeng SONG Xinmin GUO rui Research Institute of Petroleum Exploration&Development PetroChinaBeijing 100083China CNPC Engineering Technology R&D Company Limited Beijing 102206China

The transformation mechanism of muddy carbonate rock by the coupling of bioturbation and diagenesis was stud-ied based on core,cast thin section and physical property data of Cretaceous strata in the Mesopotamia Basin,the Middle *** are 3 ways of biological transformation of rocks:(1)The living creatures transformed formations mechanically to make the rocks looser and intergranular pores increase.(2)After formation,burrows were backfilled with coarse-grained debris,and then unsaturated fluid infiltrated into the burrows during the penecontemporaneous period,resulting in dissolution.(3)Chemical alteration occurred in abandoned burrows and dolomitization produced a large number of intercrystalline ***·coupling of bioturbation and dissolution occurred mainly in the penecontemporaneous phase,and was controlled by rock type,sea level decline,burrow abundance,infillings,and water environment *** the burrows had better physical properties than the matrix,unsaturated fluid preferentially migrated along the burrows,leading to dissolution and expansion of the burrows first and then dissolution of the *** coupling of bioturbation and dolomitization occurred mainly in the burial *** rich organic matter and reducing bacteria in the burrow provided material basis,reducing conditions and alkaline envi-ronment for *** metasomatism in the penecontemporaneous period had little effect on the physical properties of the *** the burrows were se parated from the deposition interface,equimolar metasomatism occurred in the burrows in a closed environment,forming euhedral fine-crystalline dolomite with intercrystalline *** transformation degree of bioturbation to muddy carbonate reservoir depends on rock type,density,connectivity,infillings and structure of the *** the increase of the carbonate mud content,the im provement to rock physical properties by bioturbation be-comes more *** the burrows are filled with co

关键词： bioturbation muddy carbonate rocks Mesopotamia Basin Cretaceous diagenesis dissolution dolomitization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：