Determination of Tubing String Vibration Parameters under Pulsed Injection of Fluids into the Well

Abstract

This article discusses issues related to the study of fluid pressure fluctuations under its injection into the production and injection wells. Details of transmission mechanism of fluid pressure fluctuations to tubing string vibrations are presented in the article. Simulation models of flow string under cyclic liquid pumping and installation of the antiwear hammer device are provided. As a result of calculations, transition amplitude vs flow string vibration frequency has been presented in the article.

Impulse non-stationary flooding of hydrocarbon deposits

“…To estimate the results and efficiency of impulse stationary flooding it is necessary to compare the effects of elastic capillary imbibition of closed pores change of filtration direction during pulse non-stationary flooding. In this case bottom-hole or well head devices (energizers, shaker apparatus, pulsators etc) are used for pulse flooding in order to boost reverse capillary imbibitions of closed oil zones and reversal filtration of the injected water [1][2][3]. Such complex flooding was tested in 2015-2016y.y.…”

“…Filtration speed component variation value in any direction does not give absolute values of oil recovery, water cutting lessening and so on. It allows receiving comparative estimation of different operational modes of water injecting wells, when capillar imbibition is enhanced by reverse fluid direction [6]. Now, let's study the influence of viscous-capillar cyclic oil-water displacement on blocks capillar imbibition acceleration.…”

Express method of injection well treatment

“…At the Stakhanovskoye field of the NGDU «Oktyabrskneft», NK «Bashneft», to restore the injection capacity of wells, which were for a long time under injection, one-time mud-pulse bottomhole treatments were performed (Table 1) [1]. After acidizing job, without reducing the pressure at the wellhead, water injection through the water pipe is immediately resumed, which allows processed products to be taken to a remote zone of the formation.…”

“…As a consequence, the injection wells gradually reduce the injection capacity, which adversely affects the injection balance. To restore the injection capacity of a well, the following methods are used: drained acid formation treatment, hydraulic fracturing, hydraulic acid treatment without sand cracks fixing, thermal treatment of formation, mud-pulse one-time treatment, draw-down pressure, shot-firing operations, etc [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Advanced Technologies for Hoist Units Service Life Increasing

“…Во многих нефтегазодобывающих управлениях для подземного и капитального ремонтов (КР) скважин применяют агрегаты: Азинмаш-32, АПРС-32, АПРС-40, А-50, А60/80 и др. [1,2]. Срок службы указанных агрегатов определен заводами-изготовителями -8 лет.…”