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Gravity Displacement Window Based on Wellbore-formation Constant Pressure Experiment

Science technology and engineering 2024年第6期24卷 2330-2338页

作者： Tao, Zhen-Yu Fan, Hong-Hai Luo, Sheng Liu, Yu-Han Deng, Song Ye, Yu-Guang College of Petroleum Engineering China University of Petroleum Beijing102249 China PetroChina North China Oilfield Bayan Exploration and Development Branch Bayannaoer015000 China CNPC Engineering Technology Research and Development Company Limited Beijing102206 China College of Petroleum Engineering Changzhou University Changzhou213164 China

In order to deal with the overflow accident caused by gravity displacement, it is necessary to understand the conditions of gravity displacement, analyze the gravity displacement window to judge whether gravity displacement occurs in the down-hole, and adopt the corresponding treatment method. The critical point experiment of gas-liquid gravity displacement was carried out by the self-developed well-formation gravity displacement experimental device. Based on the theory and experimental analysis, the formation gravity displacement window was quantitatively calculated, and the critical point pressure curve of the gravity displacement window was fitted. The error between the fitting formula and the measured value is less than 10% . Under this experimental conditions, when the drilling fluid density is 0. 998 g / cm3, the gas-liquid gravity displacement window is - 5 800 ~ 10. 6 Pa, and the liquid-liquid formation gravity displacement window is - 1 192 ~ 16. 6 Pa. The results show that the gravity density difference between gas and fluid is linear, and the actual gravity displacement window is much higher so that the influence of gravity displacement window should be considered during drilling engineering. In conclusion, the prevention method of gravity displacement and the corresponding treatment method of gravity displacement overflow are put forward. © 2024 Beijing Kexue Jishu yu Gongcheng Zazhishe. All rights reserved.

关键词： Liquefied gases

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Numerical Simulation for the Multi-media Dynamic Changes in the Fracturing and development of Tight Oil Reservoir 8th

Numerical Simulation for the Multi-media Dynamic Changes in ...

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8th International Field Exploration and development Conference, IFEDC 2019

作者： Fang, Ping-liang Shao, Li-ming Xu, Xian-guang Cheng, Rong-chao Kang, Xiao-na CNPC Engineering Technology R&D Company Limited PetroChina Beijing100083 China Research Institute of Petroleum Exploration and Development PetroChina Beijing China

ISBN: (纸本)9789811524844

In order to identify the function of coupling of flow and deformation during fracturing and development in tight oil reservoir and study the effect on reservoir performances due to the multi-media dynamic changes. Based on the mechanics mechanism of multi-media deformation on tight sandstone reservoir, the coupling of multiphase flow and reservoir deformation during fracturing and production was stated. The dynamic model of reservoir parameters for different development stages and the multiphase seepage mathematical model were established. On this basis, an integration of fracturing and production software module was developed. According to the numerical simulation on staged fracturing of horizontal wells and production in a Xinjiang tight oil field, the changing rules of physical parameters in porous and fracture media were obtained. By using this technology, the deformation law of multi-media in different development stages, such as expansion and contraction, opening and closing, rupture and propagation could be revealed;meanwhile, the effect of coupling of flow and deformation interaction on reservoir performances was analyzed quantitatively. Therefore, numerical simulation for dynamic changes of the multi-media in the fracturing and production can be used to exploit tight oil reservoir highly efficiently. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Deformation

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development and Performance Evaluation of New High Temperature Resistant Bulk Expanded Polymer Material 8th

Development and Performance Evaluation of New High Temperatu...

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8th International Field Exploration and development Conference, IFEDC 2019

作者： Shao, Li-ming Fang, Ping-liang Wei, Fa-lin Li, Wei-tao Dai, Ming-li Research Institute of Petroleum Exploration and Development PetroChina Beijing China CNPC Engineering Technology R&D Company Limited PetroChina Beijing100083 China

ISBN: (纸本)9789811524844

High temperature-resistant polymer (HTP) was synthesized by in-situ cross-linking of interpenetrating reaction using H-2 monomer containing amide bond and H-1 molecule containing hydroxyl as raw materials. IR spectra result showed that there were characteristic functional groups of H-1 and H-2 cross bond at the same time, that was to say that H-1 cross-linking reaction and H-2 polymerization could simultaneously take place. The interpenetrating cross-linking structure, extension properties at room temperature and long-term heat resistance properties of the material were tested. The experiment results showed that in the whole range of observations, HTP material cross-links and interpenetrates uniformly. The SEM pictures confirmed the interpenetration structure of HTP material. After cross-linking and interpenetration, the scale of HTP structure became smaller than before. This material had tensile resistance, dispersion stability in water, volume expansion, and could reach the maximum swelling ratio of 1.69 within 1.5 h at room temperature. At 90 °C, 120 °C and 140 °C, after soaking 130 days in formation water, HTP volume reduction rate was 1.57%, 3.24% and 6.82%, respectively. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Heat resistance

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Reserves estimation of two-layer commingled gas well by material balance method 8th

Reserves estimation of two-layer commingled gas well by mate...

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8th International Field Exploration and development Conference, IFEDC 2018

作者： Hedong, Sun Yongping, Cui Wen, Cao Yanchun, Li Research Institute of Exploration and Development PetroChina Beijing China PetroChina Exploration & Production Company Beijing China Changqing Downhole Technology Company CNPC Chuanqing Drilling Engineering Company Limited Beijing China

ISBN: (纸本)9789811371264

Traditional material balance method takes the gas reservoir as a container and completely ignores the heterogeneity between the layers, which results in great uncertainty of the single-well reserves calculation as well as the evaluation of the producing reserves of each zone for commingling gas wells. Thus, a new approach is developed to measure stratified average formation pressure with one run-in-hole and to calculate the single-well dynamic reserves. The principle of the new method is that: (1) assume that the producing pay consists of two layers, where no fluid exchange exists between the layers, and each layer meets the conditions of the traditional material balance method;(2) measure the stratified average formation pressure (at least twice);(3) On that basis, draw the relationship diagram of the single-layer average formation pressure changes (func1(p1, p2))~cumulative production & pressure(func2(p1, Gp));(4) the stratified dynamic reserves are calculated by the slope and intercept of func1 and func2 and further stratified production degree can be analyzed. Two-layer situation simulated case study shows that the method is with high accuracy and can improve the effective development of similar gas reservoirs. © Springer Nature Singapore Pte Ltd 2020.

关键词： Gases

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Numerical Simulation of Slotted Screen Plugging Mechanism Based on Cfd-Dem Coupling

SSRN

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SSRN 2022年

作者： Deng, Fucheng Gao, Zhiwei Cao, Yanfeng Deng, Junyu Shen, Xuefeng School of Mechanics Engineering Yangtze University Hubei Jingzhou434000 China CNOOC Research Institute Beijing100028 China CNPC Engineering Technology R&D Company Limited Tianjin300457 China China Petroleum Technology and Development Corporation Beijing100028 China

As the simplest and commonly used mechanical sand control method in well completion, slotted screen sand control is used for filling sand control, independent sand control in thermal production wells or geothermal wells. In order to explore the plugging mechanism of slotted screen and the factors affecting sand production during sand control, the CFD-DEM coupling method is used in this paper. The discrete element method is used to establish the model considering the physical properties of sand particles in the formation, and the fluid flow model is established combined with the finite volume method, and the full coupling solution of the two is realized and the model verification is completed. The effects of particle size distribution, sand concentration, slotted size and fluid velocity on slotted screen plugging are studied, and the plugging mechanism of slotted screen is revealed. The following research results are obtained. First, the retention form of sand particles at the screen gap is the fundamental factor affecting screen plugging. Sand bridging will have a certain probability of collapse, resulting in "false stability". Second, the proportion of larger diameter sand determines the formation time and stability of "sand bridge", and the proportion of smaller diameter sand determines the compactness of solid retention. Third, sand concentration is very important to control the plugging removal frequency of screen. Fourth, the gap size and fluid velocity affect the pressure difference on the screen surface and the stability of the "sand bridge". This study provides a reference for optimizing the selection and production control of slotted screen during the downhole sand control design. © 2022, The Authors. All rights reserved.

关键词： Sand

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New technology for Improving Water Flooding Efficiency by Adjusting Advantage Channels 8th

New Technology for Improving Water Flooding Efficiency by Ad...

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8th International Field Exploration and development Conference, IFEDC 2019

作者： Shao, Li-ming Fang, Ping-liang Wei, Fa-lin Dai, Ming-li Li, Wei-tao Research Institute of Petroleum Exploration and Development PetroChina Beijing100083 China CNPC Engineering Technology R&D Company Limited PetroChina Beijing100083 China

ISBN: (纸本)9789811524844

Underground cross-linking profile control and water shutoff and deep fluid flow to chemical agent system are usually composed of main agent, cross-linking agent and additives. The cost of cross-linking agent and additives generally accounts for 30–50% of the total cost of the system. Many inorganic salt ions are widely used as cross-linking agent or additives. In this paper, using Ca2+ and Mg2+ scale forming ion source in CaCl2 water type oilfield high salinity formation water (as water injection) as crosslinking agent, cross-linking of original inorganic microgel is carried out to reduce the cost of steering agent. The formation of nano microscale inorganic microgel with density similar to that of environmental water source can be formed by cross-linking of the steering agent with scale forming ions in formation water. The microgel can be dispersed or suspended in water, and gradually adsorbed on the rock skeleton of the dominant channel such as hole or crack to form a micro gel coating in order to narrow the flow dominant channel and form resistance to flow. The passage of plugging does not die, achieving the purpose of adjusting the dominant channel, expanding the volume and improving the efficiency of water flooding. At the same time, the particle size of the micro gel can prevent it from entering the low permeability matrix to contaminate the oil layer. The diversion agent has the characteristics of rapid dissolution, temperature resistance, salt resistance, environmental protection, long-term effectiveness and no construction risk. Field tests of deep profile control and flooding have been carried out in reservoirs with different temperature and salinity at home and abroad. After profile control diversion in test blocks or well groups, the effect of improving water flooding is good. The average increase of water injection pressure is 2–3 MPa, and the effective rate of increasing oil production and precipitation in oil wells is more than 80%, and the validity p

关键词： Chlorine compounds

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Fault Diagnosis of Gathering and Transportation Skid-mounted Equipment Based on Association Analysis

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Science technology and engineering 2025年第13期25卷 5408-5414页

作者： Qiu, Yan-Hua Zhao, Xiang-Dong He, Yan Wen, Qing Liu, Yong Lin, Yu Wu, Yu Wang, Jia-Xin Wang, Xin Gathering Engineering Technology Research Institute PetroChina Southwest Oil & Gasfield Company Chengdu610031 China School of Computer Science and Software Engineering Southwest Petroleum University Chengdu610500 China Sichuan Changning Natural Gas Development Limited Liability Company Chengdu610051 China School of Petroleum Engineering Chongqing University of Science and Technology Chongqing401331 China

In China's shale gas exploration and development, skid-mounted equipment is typically used due to its ease of disassembly, transportation, and reassembly. This equipment is often operated in high-pressure and high-temperature environments. As a result, faults are more likely to occur. To prevent production accidents and eliminate safety hazards, regular monitoring and fault diagnosis of skid-mounted gathering and transportation equipment are essential. Only relatively independent and discrete fault information is typically provided by conventional fault diagnosis methods. The relationships between faults are not uncovered. In response, a two-stage association analysis technique was proposed to analyze fault data from shale gas gathering and transportation skid-mounted equipment. The relationships between faults and defect type distributions were identified, providing valuable guidance for equipment maintenance and process optimization. It has been demonstrated through experiments on real data that the method proposed accurately identifies the relationships between defect locations and the distribution of defect types in skid-mounted equipment. A new solution is provided for the preventive detection and optimized design of gathering and transportation skid-mounted systems. © 2025 Beijing Kexue Jishu yu Gongcheng Zazhishe. All rights reserved.

关键词： Gas hazards

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A novel LWD tool based on high-frequency electromagnetic wave used for determining and ranging reservoir boundary

A novel LWD tool based on high-frequency electromagnetic wav...

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Abu Dhabi International Petroleum Exhibition and Conference 2019, ADIP 2019

作者： Teng, Xinmiao Sheng, Limin Zhang, Liancheng Ai, Weiping Gao, Wenkai Yu, Dezhou CNPC Engineering Technology Research and Development Company Limited Beijing China

ISBN: (纸本)9781613996720

To increase reservoir-encounter drilling ratio while horizontal directional drilling, this paper presents a novel LWD tool based on the high frequency electromagnetic wave, which can get the accurate distance between the drilling tools and reservoir boundary. While horizontal directional drilling in the reservoir, the LWD tool mentioned transmits a modulated single-frequency pulse, the pulse width is about 10ns and the central frequency is about 350MHz, by the transmitting antenna. The high frequency electromagnetic wave is reflected on the interface of the reservoir and the cap because of the dielectric difference. The reflected wave can be captured by the receiving antennas and then be processed in the designed algorithm aiding in ranging the distance of the reservoir boundary in real time. A 2.0*1.0*0.7 meters clay sand, concrete ground and a saline bag with the conductivity in 60mS/cm are designed to simulate the situations likely to be in real horizontal directional drilling operations and to evaluate the detection capability of the LWD tool in a controlled situation. Under the different conditions and distances, the measurement range of the LWD tool is about 0.7~2.0 meters and the accuracy is less than ±3 centimeters, a high accuracy for geosteering in horizontal directional drilling, which will be greatly helpful to keep the drilling bit drilling in the optimum position of oil or gas reservoir all the time to increase the reservoir-encounter drilling ratio. © 2019, Society of Petroleum Engineers

关键词： Infill drilling

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Influencing factors and quantitative prediction of gas content of deep marine shale in Luzhou block

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Scientific Reports 2025年第1期15卷 1896-1896页

作者： He, Xinyang Zhang, Kun Jiang, Shu Jiang, Zhenxue Wang, Xueying Jiang, Wei Li, Jing Wu, Yijia Gao, Zhi Tang, Tian Yang, Cheng Yuan, Xuejiao Han, Fengli Wang, Zeyun Ye, Laiting State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Chengdu 610500 China School of Geoscience and Technology Southwest Petroleum University Chengdu 610500 China Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences) Ministry of Education Wuhan 430074 China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum 102249 Beijing China Unconventional Petroleum Research Institute China University of Petroleum 102249 Beijing China Shale Gas Exploration and Development Project Department of CNPC Chuanqing Drilling Engineering Company Limited Chengdu 610051 China Institute of Geological Exploration and Development of CNPC Chuanqing Drilling Engineering Company Limited Chengdu 610051 China

The exploration and development of deep marine shale gas has made significant breakthroughs, but factors influencing gas contents of deep marine shale are elusive, and quantitative prediction methods of gas content needs to be refined urgently. In this study, the deep marine shale of Longmaxi Formation in Luzhou area was taken as an example, vitrinite reflectance analysis, kerogen microscopy experiment, TOC content analysis, mineral composition analysis, gas content measurement, isothermal adsorption experiment, physical property analysis and argon ion polishing scanning electron microscopy experiment were carried out to find out factors affecting the gas content of deep marine shale, and a gas content prediction model has been worked out. Conclusions below have been reached: the content of adsorbed gas is mainly affected by Ro, TOC content, porosity, water saturation, clay mineral content, formation temperature and pressure;the content of free gas is mainly controlled by porosity, water saturation, formation temperature and pressure;according to the prediction models, the adsorbed gas content, free gas content and total gas content of each well were quantitatively calculated, and the study area was divided into Class I (with a total gas content ≥ 11 m³/t), Class II (with a total gas content between 9 m³/t and 11 m³/t), and Class III (with a total gas content < 9 m³/t) gas-bearing areas.

关键词： Deep marine shale Gas content Influencing factors Longmaxi formation Quantitative prediction

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Salt resistance property evaluation of lost circulation materials for wellbore strengthening in deep geological formations

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Scientific Reports 2025年第1期15卷 1-19页

作者： Yan, Xiaopeng Cao, Linglong Zhao, Ke Zhou, Shuangjun Deng, Song Diao, Haoyu XU, Binkun Huo, Bingzhao Li, Maojiang Li, Yichen School of Petroleum and Natural Gas Engineering Changzhou University Changzhou China Xinjiang Oilfield Heavy Oil Development Company Xinjiang Karamay China Drilling Fluid Branch CNPC Xi Bu Drilling Engineering Company Limited Karamay China CNPC Engineering Technology Research and Development Co. Ltd Beijing China

Deep well drilling in high-salinity geological formations presents significant challenges, including recurrent loss of drilling fluids and repeated plugging failures. These issues necessitate a reevaluation of conventional lost circulation materials (LCMs) and their performance metrics. Here, we investigate the behavior of commonly used bridging LCMs under high-salinity conditions characteristic of the Kuqa foreland in China’s Tarim Basin. Our comprehensive experimental study reveals that high-salinity environments substantially impact the stability of LCM formed plugging zones. We demonstrate that after exposure to formation water with 200,000 mg/L salinity at 150 °C for 24 h, millimeter-sized calcium carbonate LCMs exhibit significant physical and mechanical changes. These include color darkening, 4.79% mass loss, and a 13.75% reduction in friction coefficient. The compressive strength degradation rates at D90 for pre- and post-high-salinity treatment were 17.58% and 5.48%, respectively. Walnut shell LCMs showed more pronounced alterations, with color change from dark brown to black, 32.51% mass loss, and a 28.57% decrease in friction coefficient. Their compressive strength degradation rates at D90 were 3.53% and 28.76% for pre- and post treatment, respectively. Synthetic polymer LCMs, while maintaining color stability, experienced a 9.51% mass loss and a 20.86% reduction in friction coefficient, with compressive strength degradation rates of 2.40% and 22.96% for pre- and post-treatment, respectively. Our findings indicate that the frictional performance and compressive strength of LCMs are compromised in deep, high-salinity geological formations. This deterioration leads to shearing instability and particle size degradation, ultimately resulting in plug failure. This study provides crucial insights for the selection of LCMs capable of maintaining long-term pressure stability in challenging deep, high-salinity formations, potentially revolutionizing drilling pract

关键词： Deep geological formations Lost circulation control Plugging zone stability Salt resistance

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