Rheological property of low-damage,ideal packing,film-forming amphoteric/sulfonation polymer drilling fluids

Low-permeability dense reservoirs,including micro-fractured reservoirs,are commonly characterized by high content of clay substances,high original water saturation,high sensitivity to invasive fluids,high capillary pressure,complicated structure and anisotropic,high flow-resistance and micro pore throats etc,.Generally they also have lots of natural micro fractures,probably leading to stress sensibility.Main damaging factors in such reservoirs are water-sensibility and water-blocking caused by invasive fluids during drilling and production operations.Once damaged,formation permeability can rarely recovered.Numerous studies have shown that damaging extent of water-blocking ranges from 70% to 90%.Main damaging mechanisms and influencing factors of water-blocking were systematically analyzed.Also some feasible precaution or treating approaches of water-blocking were put forward.In a laboratory setting,a new multi-functional drilling fluid composed mainly of amphion polymer,sulfonation polymer,high effectively preventive water-blocking surfactants,ideal packing temporary bridging agents(TBA) and film-forming agents,etc.,were developed.New low-damage drilling fluids has many advantages,such as good rheological properties,excellent effectiveness of water-blocking prevention,good temporary plugging effect,low filtration and ultra-low permeability(API filtration≤5 mL,HTHP filtration≤10 mL,mud cake frictional coefficient≤0.14,permeability recovery>81%),can efficiently prevent or minimize damage,preserve natural formation and enhance comprehensive development-investment effect in TUHA Jurassic dense sandstone reservoir formation with low-permeability,the only one developing integrated condense gas field.Some references can be provided to similar reservoir formations.     

工业生产中废气控制及净化处理原理及应用

介绍一种行之有效的废气控制方法及净化处理装置，说明其工作原理及设计特点。     

"材料力学"教学与考试改革的探讨

基于对当前"材料力学"教学现状的思考及当前"材料力学"课程考试制度存在的问题,针时理论教学、实验教学和考试方法等方面论述了改革的具体措施.     

丹江口水库泥沙淤积特点与问题

根据1960及2003年两次全库实测1/10 000地形电算资料,并结合历年淤积资料,对丹江口水库的淤积分布特点进行了分析研究.研究发现,丹江口水库运用36 a的总库容虽只淤积损失9.4%,但淤积分布极不均匀,其淤积量主要分布在汉江干流库区内,占全库总淤积量的73.5%.目前汉江干流库区157 m下的库容已淤积损失21.7%,且距坝177.4～56.7 km之间长达120.7 km的干流库段内,157 m的库容已淤积损失40.8%,该库段139 m的死库容已淤积损失77%.其中距坝117～92 km的库段内,157 m的库容已淤积损失47.1%.重点对汉江干流库区的淤积分布特点,及其引起的淤积问题和隐患问题,作简要的分析研究,供今后三峡水库淤积研究参考.     

女性不孕症中子宫输卵管造影的诊断价值研究

目的：研究女性不孕症中子宫输卵管造影的诊断价值。方法：取62例不孕症女性患者作为研究对象，均行子宫输卵管造影术，观察患者子宫造影情况、输卵管造影情况及造影并发症。结果：45例子宫形态正常（72.58%）,17例子宫异常；35例输卵管畅通（56.45%）,27例输卵管不畅（13.21%），其中11例输卵管堵塞；47例出现下腹疼痛症状（75.81%）,27例出现阴道出血症状43.55%),3例出现肠胃道反应症状（4.84%）,2例出现发热症状（3.23%）,1例静脉回流（1.62%）。经随访，30例患者在输卵管造影1年内成功自然怀孕，占比46.15%。结论：子宫输卵管造影术在女性不孕症诊断中具有较高价值，能显示患者子宫形态、输卵管走形，为临床判断输卵管形态异常提供科学依据，同时有助于提高怀孕率。