A Quick and Quantitative Method for Testing the Water Invasion Resistance of Cement Slurry

Abstract

The invention relates to a method for quickly and quantitatively testing the water intrusion resistance of cement slurry, which comprises the following steps in turn: (1) preparing cement slurry; (2) putting the cement slurry into a high-temperature and high-pressure thickening instrument according to the circulating pressure and temperature at the bottom of the well After curing for 20 minutes to reach the predetermined temperature and pressure, let it stand for 5 minutes and take out the cement slurry; (3) Put the small ring on the filter paper, and then use a dropper to vertically drip the cement slurry into the small ring , the distribution slurry water in the middle of the cement slurry is sucked out by the capillary force of the filter paper, and spreads freely on the surface of the filter paper outside the ring in an approximately circular shape, forming an approximately circular water circle. When the area of ​​the water circle tends to be stable, use a ruler to Or use a vernier caliper to measure the diameter of the hydrosphere and calculate the diffusion area of ​​the hydrosphere to characterize the water intrusion resistance of the cement slurry. The invention can not only meet the requirement of quickly testing the water intrusion resistance of cement slurry in field construction, but also solve many problems caused by the limitation of test conditions, and provide cementing quality assurance for subsequent construction of oil and gas wells.

Description

technical field [0001] The invention relates to the technical field of oil and gas well cementing, and relates to a method for quickly and quantitatively testing the water invasion resistance of cement slurry in well cementing operations. Background technique [0002] In recent years, with the progress of domestic exploration and development, most oilfields in my country have entered a period of high water cut production, which requires newly drilled adjustment wells to reorganize and optimize the well pattern, so as to improve the oil and gas production efficiency of oilfields. However, due to the long-term water injection development in most old oilfields, the formation pressure system is chaotic, and high-pressure areas, low-pressure areas and normal pressure areas coexist. Water seepage seriously erodes the cement slurry at the second cementing interface, deteriorating the cementing quality of the second interface, and seriously restricting the subsequent oilfield develo...

AI Technical Summary

Problems solved by technology

However, due to the long-term water injection development in most old oilfields, the formation pressure system is chaotic, and high-pressure areas, low-pressure areas and normal pressure areas coexist. Water seepage seriously erodes the cement slurry at the second cementing interface, deteriorating the cementing quality of the second interface, and seriously restricting the subsequent oilfield development

[0003] In recent years, many scholars have studied the influence of water invasion on cementing (Chen Xiaolou, Li Yang, Mo Jichun, Zhao Yonghui, Xiao Zhixing. Influence of water seepage on cementing quality in water injection development[J]. Drilling fluid and completion fluid ,1999(05):24-27) and the mechanism of water invasion during the cementing process (Shu Qiugui. Research on water invasion mechanism of adjustment well cementing in water injection block[J]. Western Exploration Engineering, 2004(02):72-74), However, when explaining the process of water intrusion and its influencing factors, it does not provide a method for quantitatively testing the ability of cement slurry to resist water intrusion.

In the follow-up research on water invasion resistance of cement slurry, Sun Jiashang and others invented a cementing slurry water invasion simulation evaluation instrument (Sun Jiashang, Li Zaoyuan, Chen Wen. A cementing cement slurry simulation evaluation instrument. Patent publication No.: CN111272627A), although this device saves operation time, it cannot carry out quantitative analysis on the water invasion resistance of cement slurry and the operation is not easy enough

Li Xiaolin and others invented a device for testing the water-proof performance of cement slurry (Li Xiaolin, Liu Wenming, Yan Zhenfeng, Ling Yong, Qi Ben, Fu Jiawen, Zong Yong, Yu Qianqian, Zheng Qilin, Huang Weijia. A device for testing cement Slurry anti-channeling performance device. Patent publication number: CN110376360A), although the device can simulate actual working conditions, the operation is too complicated

A set of evaluation device for water intrusion resistance of cementing slurry during waiting setting process developed by Zhang Xingguo et al. Device and method. Patent announcement number: CN107167499B), although the device is simple to operate, but the cost is high, and it cannot quickly test the water intrusion resistance of cement slurry

Images