- Current Issue
- Accept
- Online First Archive
Volume 52,2025 Issue 3
-
Research and Field Application of Enlarging and Shaping Technology for Coal Mine Backfilling Feeding Holes
wangkai, mashuqing, luoqingyin, shitianfeng
Abstract:
The filling material feeding hole in coal mines is a crucial passage for re-transporting the solid waste such as coal gangue produced during underground coal mining back to the underground mined-out areas for filling. Due to its high usage frequency and large transportation volume, the filling materials impact, erode and wear the hole walls during transportation, causing deformation or even damage to the feeding holes, which seriously affects their working efficiency. In response to this situation, it is necessary to handle the feeding holes. Currently, there are mainly two methods for dealing with the deformation and damage of feeding holes: one is to detect and repair the deformed or damaged positions one by one, which requires high technical standards and a large amount of work; the other is to stop using the existing feeding holes and drill new ones nearby, which is costly and time-consuming. Taking the repair and treatment of the filling material feeding holes in Beixulou Coal Mine as an example, this paper expands and shapes the original feeding holes, inserts casing pipes, and solidifies the cement to form new feeding holes, achieving the goal of quickly handling the deformed and damaged feeding holes, reducing the workload, shortening the downtime of the feeding holes, and ensuring the normal production of coal mining enterprises.
- 1
-
Influence of soft mudstone interlayer in clastic lithite deposits on drilling and engineering countermeasures
wang peng, zhan yun, huang jian, liu jia jie, li yong
Abstract:
This paper conducts an in-depth study on the drilling problems of soft mudstone strata in typical clastic rock salt deposits in Shashi salt deposits in Jiangling Sag in Jianghan Basin. Through the analysis of the characteristics of the saline-bearing strata in the study area and the actual drilling data of salt wells, the influence of soft mudstone strata on the safety, efficiency and quality of drilling engineering was systematically summarized. On this basis, a series of targeted drilling engineering technical countermeasures are proposed, such as the use of high-density undersaturated brine drilling fluid to balance formation pressure, cone bit + screw + inverted hole tool drilling tool combination, and the test drilling method of "retreat as advance". These countermeasures have been applied in the actual drilling process, which provides safety and quality assurance for subsequent construction, effectively reduces the probability of downhole complex conditions, and also provides an important reference for other drilling projects under similar geological conditions.
- 1
-
Application and Practice of Green Exploration Technology in the Drilling Project in the North Area of Taxidaban, Ruoqiang, Xinjiang
Abstract:
The practice and application of green exploration technologies have been carried out during the drilling engineering construction in the north working area of Tashidaban, Ruoqiang County, Xinjiang. According to the topographical features, geology and construction requirements, the borehole structure is determined. Scientific selection of drilling equipment, drilling methods, mud systems and drilling tool combinations is carried out. Especially for the mud formula in nearly horizontal drilling, the stability of the borehole and the construction efficiency are ensured. The requirements of green exploration, green drilling construction measures, as well as the evaluation of ecological benefits and social benefits are expounded. Practice has proved that guided by the concept of green development and by strengthening the application of green exploration technical methods, the damage to the ecological environment can be greatly reduced.
- 1
-
Study on the Efficiency and Mechanism of the Active Preflush System for Large-size Borehole Cementing
zengpeihua, Yanhaibin, Chenmin, Zhangzuohong, Mayong, Zhangjianxin, Liuhuazhi
Abstract:
Abstract: To address the challenge of poor cementing quality caused by low filter cake removal efficiency under large-diameter borehole annulus conditions with low return velocity, this study employs a high-temperature, high-pressure dynamic cleaning apparatus to evaluate the effectiveness of active flushing fluid. Experimental investigations focus on three key parameters: mixing ratio, flushing velocity, and formation permeability, with particular emphasis on enhancing slurry strength, improving flushing efficiency, and promoting interfacial bonding strength at the second interface. Scanning electron microscopy analysis was conducted to examine the cement-formation interface post-flushing. The results demonstrate that: (1) The active flushing system achieves over 100% improvement in slurry strength compared to conventional flushing fluids; (2) With 95% filter cake removal efficiency, the active system shows significantly superior performance to water-based and conventional flushing systems; (3) Under low-velocity flushing conditions (>90% efficiency). Field applications confirm that the active flushing system effectively enhances both slurry strength and secondary interfacial bonding quality, thereby substantially improving cementing operations in large-diameter wells, indicating promising practical potential.
- 1
-
Application of green self-degradable crosslinked gel in plugging of geothermal well DR2024 in Xining city
xiongzhengqiang, zouzhife, zhengyuxuan, yuanbaohong
Abstract:
The problem of lost circulation occurs frequently during geothermal well exploration and development, especially the total loss of geothermal reservoir. Lost circulation brings about wellbore stability and drilling efficiency. Geothermal DR2024 well is located in Xining city, Qinghai Province, which is a geothermal mining well. When drilling to the non-target geothermal reservoir well section of 714m to 759m, the total loss occurred.
- 1
-
Research on High Performance Water based Drilling Fluid Technology in Jin 30 Well Area of Dongsheng Gas Field
Abstract:
Aiming at the complex problem of mudstone formation leakage and collapse in Liujiagou, Shiqianfeng and Shihezi formations in Jin30 well area of Dongsheng gas field, this study systematically revealed the instability mechanism of mudstone formations through indoor rock analysis (mudstone core observation, X-ray diffraction mineral composition analysis, scanning electron microscopy and thin slice analysis) and physical and chemical performance tests. The study shows that the mudstone formations in this area have the characteristics of high clay mineral content and multi-scale fracture development, and are prone to clay hydration expansion and fracture expansion during drilling, resulting in well wall instability. Based on this, a well wall stabilization technology with the core of inhibiting clay hydration swelling and strengthening multi-scale fracture plugging is proposed., Through indoor research and field application verification, the developed multi-salt ratio high-performance compound salt drilling fluid realizes effective control of hard and brittle mudstone in the long naked eye section, and significantly improves the well wall stability. In the industrial test of 11 wells in Dongsheng Gas Field, the drilling period was shortened by 36% year-on-year, and the output was increased by 26.7% compared with the allotment. The research results provide important technical support for solving the problem of efficient drilling in complex mudstone formations, and provide theoretical basis and practical reference for oil and gas exploration and development under similar geological conditions. It provides technical support for efficient drilling of mudstone formation in Jin30 well area of Dongsheng gas field.
- 1
-
Construction technology of large angle hole ZK2901 in Chang'an gold mine, Jinping, Yunnan
Abstract:
: With the increasing demand for mineral resource exploration in recent years, the depth of core drilling and the complexity of strata have been increasing, leading higher requirements for controlling the trajectory of drill holes in order to accurately target the ore bodies and achieve geological objectives. This paper introduces the construction overview of the Z2901 drill hole at the Chang"an gold mine, and addresses a series of technical difficulties such as wall collapse, rock falling, drill breakage accidents,-gauging of drill holes, depth trajectory control, and core sampling in complex strata. It summarizes the experience of construction of large-angle geological core drilling, provides technical references for the construction of large-angle geological core drilling.
- 1
-
Application of Diaphragm Pressing Waste Slurry Treatment Device in Geological Drilling
YU Fu-an, liuweiping, fengmeigui, lixiaodong, PENG Bo-yi, sunjianyue, zhuyingchang, qinzhendong
Abstract:
The waste flushing fluid generated during geological drilling often contains pollutants such as drill cuttings and various chemical treatments. These pollutants are characterized by high chromaticity, high COD, and high suspended solids. If directly discharged, they will affect the surrounding soil, water quality, and biological environment. With the in - depth implementation of the concept of green exploration in the field of geological drilling, the diaphragm pressing waste slurry treatment device has emerged and played an important role.This paper mainly introduces the TGYG type diaphragm pressing waste slurry treatment device, which is designed based on the concept of a small skid - mounted modular structure. It has been successfully applied in medium - deep hole geological drilling in Zhumadian, Henan. Through on - site harmless treatment of the waste flushing fluid, the liquid content of the separated solid phase is reduced to less than 20%, significantly reducing the volume and mass of the waste flushing fluid, reducing environmental pollution, and promoting resource recycling. It provides valuable practical experience for the harmless treatment of waste flushing fluid in geological drilling and can effectively contribute to the full implementation of green exploration work in the new round of strategic action for breakthroughs in mineral exploration.
- 1
-
This research endeavor aims to examine the efficacy of gas injection as a method for improving oil recovery in the context of high-temperature, high-pressure, and low-permeability oil reservoirs located in the western region of the South China Sea.
Wang yujun, CUI shuheng, GUO minling, MOU zhipeng
Abstract:
In light of the potential feasibility of gas injection for the development of high-temperature, high-pressure, low-permeability oil reservoirs in the western South China Sea and the imperative to enhance oilfield recovery efficiency, this study embarked on a series of laboratory experiments. These experiments were conducted with a focus on two gas types: carbon dioxide (CO2) and hydrocarbon-associated gas. Under high-temperature and high-pressure conditions, fine-tube experiments and long-core displacement tests were meticulously carried out.A comparative analysis of the oil displacement efficiency of the two gases was undertaken, leading to a comprehensive evaluation of their development performance. The research findings indicate that under high-temperature and high-pressure conditions, CO2 injection achieved a maximum oil displacement efficiency of 88.8%. Among various injection strategies, the alternating gas-water injection method yielded the highest displacement efficiency of 87.4%. The injection angle was found to have a maximum impact of 3.2% on the displacement efficiency. Notably, a significant decline in displacement efficiency was observed when the injection pressure dropped below 30 MPa, with the lower injection pressures correlating with an increased oil production capacity upon gas breakthrough.Hydrocarbon gas flooding and CO2 injection technologies are deemed applicable to the high-temperature, high-pressure, low-permeability oil reservoirs in the western South China Sea, demonstrating efficacy in enhancing formation energy and holding substantial potential for widespread application.
- 1
-
Practice and Discussion of Green Drilling Construction in Green Exploration
Abstract:
This paper focuses on the field of geological core drilling engineering, guided by the concept of green exploration, introduces the construction characteristics of modular drilling machines and their advantages in the construction of complex terrain in forest-covered areas and mountainous areas through the application of modular drilling machines and flushing liquid treatment equipment, analyzes the adaptability of drilling machines to diverse engineering needs through module combination, and studies the importance of flushing liquid treatment technology, including the performance requirements of flushing liquid, recycling mechanism and corresponding treatment process, discusses the significance of scientific and reasonable flushing liquid treatment methods for protecting the environment, and provides reference for promoting the green development of the drilling industry.
- 1
