Well-Control Operations in Horizontal Wells

Abstract

This paper analyzes well control for horizontal wells. It presents a computer model for predicting the pressure behavior in a horizontal well during gas-kick removal and analyzes the simulation results for several field conditions. The paper also analyzes the drillpipe-pressure schedule, the kick-tolerance concept, and the swabbing effect during tripping out of the hole.

Deepwater gas kick simulation

“…Discretization of the partial differential Eqs. (1) through (3), using a finite difference method (Nickens, 1987;Santos, 1991), results in the following equations: where, u j i +1 =2 = u j i +1 + u j i 2 , u j n +1 = 2 = u j n + 1 + u j n 2 and uj n + 1 = 2…”

Advanced Two-Phase Well Control Analysis (November)

“…If there is a single-phase region below the two-phase mixture, the pressure at the bottom of the two-phase mixture is calculated from Equation (6). For the two-phase region, a fully implicit finite difference method is applied for each discretized grid segment.…”

“…Well control simulation has received attention in recent years because of its applicability and flexibility, and many computer models (3)(4)(5)(6)(7)(8)(9)(10) have been developed to analyse the behaviour of a kick. The main objective of a kick simulator is to predict pressure and volume behaviour of kick fluids as a function of time.…”

“…He did not modify the conservation of momentum equation for uneven wellbore geometries. The same equations were used by Starrett et al (5) and Santos (6) , but their research was limited to uniform wellbore geometry. Therefore, it is necessary to develop a well control model to simulate realistic kick behaviours in variable wellbores with the consideration of mud compressibility and reservoir parameters.…”

The Well Control Equipment of Tarim Oil Field Surpressure Gas Well

“…Also the restructuring of a single flow valve structure, solves the problem of high density drilling fluid erosion, gas separation effect is poor and some weak points such as well control equipment has made significant progress, to avoid the emergence of well control equipment failure process technology to implement well control, ensure the continuity of well control technology implementation. At present, the well control equipment and technology of the ultra-high pressure gas well have been matched to form a set of well control technology [5,6] ,it can be used to guide the control of the high pressure gas wells in the future, and to make up for the shortage of the well control work [5][6][7][8] . Ultra high pressure gas well control equipment, the combination of three types: Combination type I mainly used for pressure level 70MPa (Table 1);Combination type II is mainly Used for pressure level 105MPa (Table 2); Combined supporting type III is mainly used for abnormal Table 1 Specification for the combination type of wellhead equipment and well control equipment for ultra-high pressure gas wells High pressure and abnormal area exploration of 105MPa.The well control equipment of the ultra-high pressure gas well is mainly composed of the following parts: 1).…”