机械液压复合套管整形工艺技术的研究与应用

The research and application of the mechanical and hydraulic compound reshaping technique

摘要:

辽河油田是一个有着40多年开发历史的老油田，其稠油产量占据原油产量的半壁江山，其稠油开采工艺主要为蒸汽吞吐、蒸汽驱、SAGD和火驱。以加热原油温度降低其粘度的方法，在多轮次生产之后套管都会不同程度地受到损坏。套管整形技术是套管修复主体技术之一。针对梨形胀管器整形技术难应用于近井口井段、液压整形技术单次整形的长度有限等问题，研制了一种新型的机械液压复合套管整形工具。新型机械液压复合套管整形工具主要由高强度合金钢多级胀头、加长管柱（选配）、液压增力器、水力锚、安全泄压装置等部分组成。通过理论计算，给出了胀头的材料强度、液压增力器推力、水力锚锚爪数量及压力阀值等建议值，通过梨形胀管器技术和复合套管整形技术现场应用对比，证实使用机械液压复合套管整形技术，可将作业时间大幅度缩短，具有良好的应用前景和推广价值。

Abstract:

Liaohe Oilfield is an old oilfield with more than 40 years of development history. Its heavy oil production accounts for half of the crude oil production. Its heavy oil recovery technologies mainly include steam huff and puff， steam flooding， SAGD and fire flooding. With heating the temperature of crude oil to reduce its viscosity， casing will be damaged in varying degrees after several rounds of production. Casing shaping technology is one of the main technologies for casing repair. Casing deformation is prone to occur with the increase of oilfield development time. In order to ensure the production of oil fields， casing needs to be repaired by the casing reshaping process. In this paper， a new type of mechanical and hydraulic compound casing reshaping technology is developed by combining the conventional pear-shaped reshaping process with the hydraulic reshaping process. Through the optimization design of the expansion head structure， including extension of the length of the tapered guide shoe section and reduction of the taper of the guide shoe section， improvement of the steel bead strength with alloy steel used for the expansion head， which makes the steel bead strength much higher than P110 steel level， the sticking problem in the process of hydraulic reshaping construction due to the low strength of the expansion head and easy is solved. Moreover， by creatively putting forward the structure with the rigid drill collar string ahead of the expansion head， the difficulty in passing the hydraulic reshaping tool through the perforated interval has been solved successfully. The new casing reshaping technology provides fast operation of pear-like reshaping technology and strong reshaping ability of hydraulic reshaping technology. The comparison of the pear-like expanding tube expander and composite casing shaping technology shows that mechanical-hydraulic composite casing shaping technology can greatly shorten the operation time， and has good application prospect and promotional value.