新型复合材料测井钻杆的研制

Development of a New Composite Material Logging Drilling Rod

现有复合材料测井钻杆在使用过程中易出现漏电,从而影响使用寿命的原因,其漏电主要原因为钢芯与复合材料的界面易破坏,易破坏的主要原因为:界面粘接强度偏低、粘接面积偏小、复合材料/钢材膨胀系数不同而造成的应力破坏,为此将测井钻杆的复合材料部分分为Ⅰ、Ⅱ两个部分,通过提高Ⅰ部分复合材料的膨胀系数,受热时,复合材料膨胀而压紧O型圈,达到密封目的,部件Ⅰ采用热压罐工艺成型;为了减少复合材料中的气泡,并提高效率,部件Ⅱ采用RTM工艺。

The existing composite well drilling rod is prone to leakage,this affects the service life.The main reason for its leakage is that the interface between the steel core and the composite material is easy to destroy.The main reasons for easy destruction are stress damage caused by low interface adhesion strength,small adhesion area,and different expansion coeff icient of composite material/steel.The composite part of the logging shaft is divided intoⅠandⅡtwo parts.By increasing the expansion coeff icient of the PartⅠcomposites,when heated,composite material expands and presses the O-circle.For sealing purposes,partⅠis formed by hot pressure tank process.To reduce the air bubbles in the composite material,and to improve the eff iciency,partⅡadopt RTM process.