Shiyou jixie, 2014 砂砾岩油藏为典型的低孔特低渗透储层，采用直斜井压裂方式开采，油井产能低，储量动用低，常规技术开发效益不佳，为了提高单井产能而选用长水平段分段压裂的开发方式。介绍了胜利油田首口砂砾岩非常规长水平段水平井盐227-1HF井的地质、工程概况，探讨了钻井技术难点，给出了可行的钻井技术措施，包括钻具组合优选、井眼轨迹控制、钻头优选、钻井液技术优化以及水平段测量技术优选。为了提高水平段的钻井速度而采用欠平衡泡沫钻井液钻井，水平段平均机械钻速达到6.21 m/h，是邻井的3～4倍，压裂投产后单井日产油12 t ...
吴明波, 曹向峰
doaj
An edge awareness-enhanced visual SLAM method for underground coal mines [PDF]
ObjectiveUnderground coal mines commonly exhibit low illuminance, weak textures, and structuralization-induced feature degradation. These scenes lead to challenges of insufficient effective features and high mismatch rates to the visual simultaneous ...
Qi MU +4 more
core +1 more source
Extraction mode and engineering demonstration of pressure relief three-dimensional of multi-coal seams in Pingdingshan mining area [PDF]
There are many coal seams and gas-bearing strata in Pingdingshan mining area, and the amount of underground gas control project is large and difficult.
Jinsheng JIA, Xiaoming NI, Yanhe LI
core +1 more source
Shiyou jixie, 2015 目前国内的测试装置只能满足105 MPa以下压裂泵的整机测试与试验需要，对于105 MPa以上超高压压裂泵的测试与试验，一方面配套设备很难满足要求，另一方面还有较高的安全风险。为此，研究了一种超高压压裂泵液缸测试装置及试验方法。压裂泵液缸测试装置适应环境温度-20～50 ℃，试验压力最高达207 MPa，可为以后更高压力压裂泵提供检验方法；测试装置装有安全气控阀，确保整个系统压力不超过275 MPa，气源压力0.7 MPa，气源排量不超过1.6 m3/min；气泵输入口增加安全溢流阀，使气压值不超过0 ...
吴苗法, 姜, 涌, 李婧源
doaj
Zhejiang Daxue xuebao. Lixue banThe strike-slip faults in the deep carbonate rocks in the Shunbei-Shunnan area of the Tarim Basin are well-developed and have significant controlling effect on hydrocarbon accumulation in the Lower Paleozoic carbonate rocks.
吴孔友(WU Kongyou) +4 more
doaj +1 more source
An analytical method for the desorption superposition effect in commingled production of coalbed methane and its application: A case study of the Xiaotun mine field in western Guizhou Province, China [PDF]
ObjectiveThe commingled production of coalbed methane (CBM) serves as a significant means to increase single-well production. However, production practices reveal that the commingled production of CBM exhibits complex and varied effects and controlling ...
Chen GUO +10 more
core +1 more source
Gaoya dianqi, 2019 绝缘管型母线是一种新型的母线产品,有着优异的性能。但应用时间较短,研究不够深入,致使故障频发。文中设计与制备了含气泡缺陷环氧浇注绝缘管型母线真型样品,通过加压电破坏试验,研究其电击穿机理。在试验中首次发现了气体膨胀鼓包导致最终击穿的破坏方式。研究结果表明,电—机械击穿应为其击穿模式,其击穿过程可分为气体增强阶段和击穿临界阶段两个阶段,并得到了阶段特征与阶段变化判据。气隙内由局部放电导致环氧树脂分解所产生的气体气压超过气隙壁断裂韧性临界值,造成裂纹失稳扩展是击穿的主要原因 ...
任想 +6 more
doaj
Influence of fracturing reconstruction of coalbed methane wells on gas production and development suggestions in Guizhou Province: taking Panguan syncline as an example [PDF]
In Guizhou Province, there are many coal-bearing structural units, many layers of coal, thin thickness, and most of them are low permeability reservoirs, so it is advisable to adopt the process of “staged fracturing and combined layer drainage and ...
Haiyang HU +6 more
core +1 more source
Prospects for the development of the theory and technology of non-hydration penetration enhancement in soft coal seams [PDF]
In the future quite a long historical period, China will still adhere to the basic national conditions of coal. The efficient exploitation of coal, as a guarantee energy source, is crucial to China's energy security.
Changjiang CHEN +7 more
core +1 more source
Research on adaptability of fracturing technologies for CBM horizontal wells based on the viewpoint of “unblocking and channeling” [PDF]
Horizontal well fracturing stimulation is currently the most core technical means to achieve efficient development of unconventional coalbed methane resources.
Jigang GUO +11 more
core +1 more source