Experimental and numerical study on casing wear in highly deviated drilling for oil and gas

Abstract

Aimed at studying the casing wear in the highly deviated well drilling, the experimental study on the casing wear was carried out in the first place. According to the test data and the linear wear model based on the energy dissipation proposed by White and Dawson, the tool joint-casing wear coefficient was obtained. The finite element model for casing wear mechanism research was established using ABAQUS. The nodal movement of the contact surface was employed to simulate the evolution of the wear depth, exploiting the Umeshmotion user subroutine. In addition, the timedependent geometry of the contact surfaces between the tool joint and casing was being updated continuously. Consequently, the contact area and contact pressure were changed continuously during the casing wear process, which gives a more realistic simulation. Based on the shapes of worn casing, the numerical simulation research was carried out to determine the remaining collapse strength. Then the change curve of the maximum casing wear depth with time was obtained. Besides, the relationship between the maximum wear depth and remaining collapse strength was established to predict the maximum wear depth and the remaining strength of the casing after a period of accumulative wear, providing a theoretical basis for the safety assessment of worn casing.

Wear factors and mechanisms of L-80 steel casings

“…In general, the main variables that directly affect casing wear amount are the size of the casing and the drill pipe (DP), the grade of the drill pipe , the tool joint hardbanding material, the drilling speed, the applied side load, and the drilling fluid type and additives [4,5]. Huimei and Yishan [6] studied casing wear behavior in directional wells and discovered that the major factors that influence the casing wear are, the tool rotational speed, the rate of penetration, the drilling mud properties as well the well geometry [7].…”

“…Therefore, several studies have been conducted to quantify wear and estimate the wear factors under numerous conditions. Yu et al [6] investigated casing wear during oil well drilling at high deviation angle. Based on both experimental data and the wear model, the wear factor was obtained.…”

Effects of Drilling Parameters and Mud Types on Wear Factors and Mechanisms of SM2535 Casings

“…Doering et al [9] demonstrated that the new small-scale casing wear tester can produce wear mechanisms equivalent to both historical data produced by the DEA-42 test and from commercial down-hole service. Yu et al [10] developed an equation that relates the maximum wear depth to the residual casing strength after accumulative wear. Chen et al [11] examined the impact of drill string length, speed of rotation, direction of travel, and density of the drilling fluid on friction and they established a mathematical model to calculate the spacing of the friction reduction tool.…”

Introduction and investigation of magnetic location system for steam-assisted gravity drainage dual-horizontal heavy oil wells

“…SAGD has been proven to be an effective heavy oil thermal recovery technology. [4][5][6] Figure 1 shows the method of implementing SAGD: a couple of horizontal wells with parallel horizontal sections are drilled at the bottom of the reservoir, the steam is injected into the upper horizontal well, the injected steam moves upward to form a steam chamber and continuously propagates upward and laterally to exchange the heat with oil, and the heated oil and the steam condensate are drained by the gravity to the lower production horizontal well and produced by artificial lift. Drilling SAGD wells needs to accurately control both horizontal sections, which are not only fixed at a spatial distance but also wholly extended in the reservoir sandstone.…”