CAJ | 학술논문

针对螺杆泵采油中存在的杆管偏磨问题，建立了基于电参数的抽油杆偏磨分析模型。通过模型分析发现：抽油杆扭矩和轴向力的变化都能反映工况的变化；抽油杆扭矩与沉没度正相关，与油管半径负相关；当扭矩和轴向力发生变化时，抽油杆的偏磨程度就会发生变化，该变化会在电流和有功功率参数中反映出来。结合现场故障井数据分析得出：有功功率对工况变化的敏感性强，尤其对中小驱动装置或电机轻载情况，比电流具有更强的反映工况变化的能力；当抽油杆磨断时，电流会有一定程度降低，而有功功率则产生明显突变；含蜡量、转速和沉没度偏高所引起的杆管偏磨监测曲线的变化趋势与基于电参数的抽油杆偏磨模型的分析结果一致。根据研究结果，提出用自动调速功能控制沉没度波动；通过控制系统自动调整螺杆泵转速的方法改变液面深度，使杆管磨损程度大幅度降低；应用自动连续监测方法确定螺杆泵井的合理热洗周期，从而预防含蜡量偏高所引起的杆管偏磨。
침대라간빙채유중존재적간관편마문제，건립료기우전삼수적추유간편마분석모형。통과모형분석발현：추유간뉴구화축향력적변화도능반영공황적변화；추유간뉴구여침몰도정상관，여유관반경부상관；당뉴구화축향력발생변화시，추유간적편마정도취회발생변화，해변화회재전류화유공공솔삼수중반영출래。결합현장고장정수거분석득출：유공공솔대공황변화적민감성강，우기대중소구동장치혹전궤경재정황，비전류구유경강적반영공황변화적능력；당추유간마단시，전류회유일정정도강저，이유공공솔칙산생명현돌변；함사량、전속화침몰도편고소인기적간관편마감측곡선적변화추세여기우전삼수적추유간편마모형적분석결과일치。근거연구결과，제출용자동조속공능공제침몰도파동；통과공제계통자동조정라간빙전속적방법개변액면심도，사간관마손정도대폭도강저；응용자동련속감측방법학정라간빙정적합리열세주기，종이예방함사량편고소인기적간관편마。
Prejudgment of eccentric wear of screw pump rod was conducted by an analysis model that was established according to electrical parameters .Following behaviors were observed in analysis with the model :both torque and axial force changes of the sucker rod could reflect the variation of working condi-tions ;the rod torque was positively correlated with submergence degree and negatively with tubing radius ;and when torque and axial force changed ,the eccentric wear of rod changed accordingly ,which could be re-flected by such parameters as current and active power .Data analysis of field fault wells indicated that ac-tive power was more highly sensitive than current to the change of working conditions ,especially for the small or medium-sized drive unit or motors with light loads ;when the sucker rod worn off ,current might drop to a certain extent ,but the active power changed abruptly ;the curve of eccentric wear due to higher wax content ,rotation speed and submergence depth was consistent with the results analyzed with the model based on electrical parameters .It was proposed that utomatic speed-adjusting function be used to control the fluctuation of submergence depth ;liquid level be changed by automatically adjusting the rotary speed of pump ,so as to mitigate the eccentric wear of rod significantly ;and reasonable hot washing period of wells was determined by monitoring screw pump automatically and continuously to prevent eccentric wear due to higher wax content .