To effectively solve the problem of lost circulation and well kick frequently occurring during the drilling of abnormally high temperature and pressure fractured-vuggy reservoirs in the Tazhong block, a rigid particle...To effectively solve the problem of lost circulation and well kick frequently occurring during the drilling of abnormally high temperature and pressure fractured-vuggy reservoirs in the Tazhong block, a rigid particle material, GZD, with high temperature tolerance, high rigidity(> 8 MPa) and low abrasiveness has been selected based on geological characteristics of the theft zones in the reservoirs. Through static pressure sealing experiments, its dosage when used alone and when used in combination with lignin fiber, elastic material SQD-98 and calcium carbonate were optimized, and the formula of a new type(SXM-I) of compound lost circulation material with high temperature tolerance and high strength was formed. Its performance was evaluated by compatibility test, static sealing experiment and sand bed plugging experiment. The test results show that it has good compatibility with drilling fluid used commonly and is able to plug fractures and vugs, the sealed fractures are able to withstand the static pressure of more than 9 MPa and the cumulative leakage is 13.4 mL. The mud filtrate invasion depth is only 2.5 cm in 30 min when the sand bed is made of particles with sizes between 10 mesh and 20 mesh. Overall, with good sealing property and high temperature and high pressure tolerance, the lost circulation material provides strong technical support for the safety drilling in the block.展开更多
目的探讨血清黑色素瘤缺乏因子2(absent in melanoma 2,AIM2)和白三烯B4(leukotriene B4,LTB4)水平与急性缺血性脑卒中(acute ischemic stroke,AIS)患者预后的相关性。方法收集2020年2月~2021年2月期间于西安交通大学第一附属医院、西...目的探讨血清黑色素瘤缺乏因子2(absent in melanoma 2,AIM2)和白三烯B4(leukotriene B4,LTB4)水平与急性缺血性脑卒中(acute ischemic stroke,AIS)患者预后的相关性。方法收集2020年2月~2021年2月期间于西安交通大学第一附属医院、西安交通大学附属红会医院、咸阳市第一人民医院和泾阳县医院接受组织型纤溶酶原激活剂(tissue plasminogen activator,tPA)进行静脉溶栓治疗的138例AIS患者的临床资料进行回顾性分析。收集患者治疗三月后的改良Rankin评分量表(modified Rankin rating scale,mRS)评价其神经功能情况。依据mRS评分将AIS患者分为预后良好组(mRS评分≤2分,n=87)和预后不良组(mRS评分>2分,n=51)。采用酶联免疫吸附试验检测血清AIM2和LTB4水平。收集患者入院时的美国国立卫生研究院卒中患者神经功能缺损(neurological deficits in stroke patients at the National Institutes of Health,NIHSS)评分、梗死体积和侧支循环建立状况等信息。分析血清AIM2和LTB4水平、入院NIHSS评分、梗死体积和侧支循环建立状况与AIS患者预后的相关性。建立多因素Logistic回归模型分析rt-PA静脉溶栓后AIS患者预后不良的危险因素。结果与预后良好组比较,预后不良组的血清AIM2(1161.51±338.56pg/ml vs 964.77±171.94pg/ml)和LTB4水平(137.99±35.49pg/ml vs 117.85±21.60pg/ml)明显增高,差异具有统计学意义(t=4.638,4.148,均P<0.01)。Logistic回归分析发现AIS患者血清AIM2和LTB4水平增高、梗死体积增大、入院NIHSS评分增高及侧支循环建立状况较差均为AIS患者预后不良的独立危险因素(均P<0.05)。相关性分析显示AIS患者的血清AIM2和LTB4水平分别与梗死体积和入院NIHSS评分呈正相关性(r=0.374,0.334;0.233,0.304,均P<0.05)。AIM2和LTB4水平增高患者的侧支循环建立状况较差(均P<0.01)。受试者工作特征(receiver operating characteristic,ROC)曲线分析显示AIM2,LTB4及联合检测诊断AIS预后不良的曲线下面积(area under curve,AUC)分别为0.706(95%CI:0.607~0.806,P=0.000),0.745(95%CI:0.655~0.835,P=0.000)和0.740(95%CI:0.648~0.833,P=0.000);约登系数分别为0.424,0.386和0.422;敏感度和特异度分别为60.80%,81.60%;62.70%,75.90%;68.60%,75.80%。AIM2和LTB4诊断AIS预后不良的截断值分别为1065.93pg/ml和130.68pg/ml。结论血清AIM2和LTB4水平增高可能增加AIS患者rt-PA静脉溶栓后预后不良的风险,因此检测患者血清AIM2和LTB4水平可以为AIS患者的预后评估提供依据。展开更多
基金Supported by the China National Science and Technology Major Project(2011ZX05042-002-001)
文摘To effectively solve the problem of lost circulation and well kick frequently occurring during the drilling of abnormally high temperature and pressure fractured-vuggy reservoirs in the Tazhong block, a rigid particle material, GZD, with high temperature tolerance, high rigidity(> 8 MPa) and low abrasiveness has been selected based on geological characteristics of the theft zones in the reservoirs. Through static pressure sealing experiments, its dosage when used alone and when used in combination with lignin fiber, elastic material SQD-98 and calcium carbonate were optimized, and the formula of a new type(SXM-I) of compound lost circulation material with high temperature tolerance and high strength was formed. Its performance was evaluated by compatibility test, static sealing experiment and sand bed plugging experiment. The test results show that it has good compatibility with drilling fluid used commonly and is able to plug fractures and vugs, the sealed fractures are able to withstand the static pressure of more than 9 MPa and the cumulative leakage is 13.4 mL. The mud filtrate invasion depth is only 2.5 cm in 30 min when the sand bed is made of particles with sizes between 10 mesh and 20 mesh. Overall, with good sealing property and high temperature and high pressure tolerance, the lost circulation material provides strong technical support for the safety drilling in the block.
文摘目的探讨血清黑色素瘤缺乏因子2(absent in melanoma 2,AIM2)和白三烯B4(leukotriene B4,LTB4)水平与急性缺血性脑卒中(acute ischemic stroke,AIS)患者预后的相关性。方法收集2020年2月~2021年2月期间于西安交通大学第一附属医院、西安交通大学附属红会医院、咸阳市第一人民医院和泾阳县医院接受组织型纤溶酶原激活剂(tissue plasminogen activator,tPA)进行静脉溶栓治疗的138例AIS患者的临床资料进行回顾性分析。收集患者治疗三月后的改良Rankin评分量表(modified Rankin rating scale,mRS)评价其神经功能情况。依据mRS评分将AIS患者分为预后良好组(mRS评分≤2分,n=87)和预后不良组(mRS评分>2分,n=51)。采用酶联免疫吸附试验检测血清AIM2和LTB4水平。收集患者入院时的美国国立卫生研究院卒中患者神经功能缺损(neurological deficits in stroke patients at the National Institutes of Health,NIHSS)评分、梗死体积和侧支循环建立状况等信息。分析血清AIM2和LTB4水平、入院NIHSS评分、梗死体积和侧支循环建立状况与AIS患者预后的相关性。建立多因素Logistic回归模型分析rt-PA静脉溶栓后AIS患者预后不良的危险因素。结果与预后良好组比较,预后不良组的血清AIM2(1161.51±338.56pg/ml vs 964.77±171.94pg/ml)和LTB4水平(137.99±35.49pg/ml vs 117.85±21.60pg/ml)明显增高,差异具有统计学意义(t=4.638,4.148,均P<0.01)。Logistic回归分析发现AIS患者血清AIM2和LTB4水平增高、梗死体积增大、入院NIHSS评分增高及侧支循环建立状况较差均为AIS患者预后不良的独立危险因素(均P<0.05)。相关性分析显示AIS患者的血清AIM2和LTB4水平分别与梗死体积和入院NIHSS评分呈正相关性(r=0.374,0.334;0.233,0.304,均P<0.05)。AIM2和LTB4水平增高患者的侧支循环建立状况较差(均P<0.01)。受试者工作特征(receiver operating characteristic,ROC)曲线分析显示AIM2,LTB4及联合检测诊断AIS预后不良的曲线下面积(area under curve,AUC)分别为0.706(95%CI:0.607~0.806,P=0.000),0.745(95%CI:0.655~0.835,P=0.000)和0.740(95%CI:0.648~0.833,P=0.000);约登系数分别为0.424,0.386和0.422;敏感度和特异度分别为60.80%,81.60%;62.70%,75.90%;68.60%,75.80%。AIM2和LTB4诊断AIS预后不良的截断值分别为1065.93pg/ml和130.68pg/ml。结论血清AIM2和LTB4水平增高可能增加AIS患者rt-PA静脉溶栓后预后不良的风险,因此检测患者血清AIM2和LTB4水平可以为AIS患者的预后评估提供依据。
