YL型有机缓凝剂的制备及其应用

Preparation and application of YL organic retarders

摘要:

油气井漏失是钻井中常见的问题，解决这种问题最常见的方法是利用水泥进行封堵。然而，普通水泥自重大易导致堵漏失败，低密度水泥由此在堵漏中得到了快速推广。应用中认识到低密度水泥与缓凝剂的适配性尤为重要，缓凝剂会严重影响水泥性能。针对上述问题，制备了一种低密度水泥用缓凝剂。红外和热重结果表明，缓凝剂的制备达到了理想效果，抗温性能为450 ℃。高温高压稠化仪测试结果显示，在120 ℃、68 MPa条件下，0.4%缓凝剂的缓凝时间为225 min，具备良好的缓凝效果。通过使用六速粘度计、稠化仪和无侧限抗压仪，研究了缓凝剂对低密度水泥浆液常规性能的影响，实验结果证实，不同浓度的缓凝剂对水泥的流变性和抗压强度不产生显著影响，温度的升高会缩短水泥浆液的稠化时间。制备的缓凝剂与低密度水泥一同进行了现场应用，结果证明，该缓凝剂效果优异，满足现场施工需求，值得进一步推广。

关键词:油气井漏失;低密度水泥浆液;有机缓凝剂;堵漏

Abstract:

Oil and gas well leakage is a common problem in drilling， usually sealed with cement. However， the heavy weight of ordinary cement can easily lead to failure in plugging. Meanwhile， low-density cement has been rapidly promoted in plugging. The compatibility between low-density cement and retarders is particularly important， which the performance of cement is effected seriously by retarders. In response to the above issues， a retarder for low-density cement. The infrared and thermogravimetric results indicated that the preparation of the retarder has achieved ideal results， with a temperature resistance of 450℃. The test results of the high-temperature and high-pressure thickener showed that a retarding time of 225 minutes was obtained for the low-density cement with 0.4% retarder under the conditions of 120℃ and 68MPa， which is a good retarding effect. By using a six speed viscometer， thickener， and unconfined compression tester， the effect of retarders on the conventional performance of low-density cement slurry was studied. The experimental results confirmed that different concentrations of retarders did not have a significant impact on the rheological properties and compressive strength of cement， and an increase in temperature would shorten the thickening time of cement slurry. The prepared retarder has been applied on site together with low-density cement， and the on-site results have shown that the retarder has excellent effects and meets the needs of on-site construction， which is worthy of further promotion.

Key words:oil and gas well leakage;low density cement slurry;organic retarder;plugging leakage