A novel fluid for use in oil and gas well construction to prevent the oil and gas leak from the wellbore. (30th August 2019)

• Record Type: Journal Article
• Authors: Du, Jiapei; Bu, Yuhuan; Shen, Zhonghou; Cao, Xuechao
• Is Part Of: Construction & building materials. Volume 217(2019)
• Page Start: 626
• Page End: 637
• Publication Date: 2019-08-30
• Subjects: Weakly consolidated formation -- Cementing fluid -- Oil and gas leak -- Shear bonding strength -- Percolation condition; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.05.100
• Languages: English
• ISSNs: 0950-0618

Abstract

Graphical abstract: Highlights: A novel and efficient fluid is proposed to prevent oil and gas leak from wellbore. Mechanical properties and thickening time can satisfy the demand of cementing operation. Optimum operation parameters under percolation condition are provided. Sealing properties of weakly consolidated formation enhanced by four reactions and three patterns. Abstract: This paper proposed a novel and efficient fluid for use in oil and gas well of deep-water weakly consolidated formation to prevent the oil and gas leak from the wellbore. The proper placement techniques are suggested to make the annulus and formation consolidated at the same time. The evaluation of compressive strength and thickening time of cementing fluid illustrated that the cementing fluid is suitable to use as oil well cement and formation curing agent. The optimal parameter of grouting pressure, grouting time, curing time, water/solid ratio and undrained shear strength of formation are proposed by depth of penetration, compressive strength and shear bonding strength tests. The reaction mechanism and solidification pattern of cementing fluid are revealed. After the operation of cementing fluid, the strength transition zone formed in the adjacent area of wellbore. Thus, the bonding strength of cement-formation interface was enhanced, and the leakage of oil and gas can be prevented.