Abstract

This paper describes a new software program developed for the maintenance/monitoring of cathodic protection systems on oilfield well casings. The program was a joint effort by Mobil E and P U.S. and DMDT.

Due to Mobil's large number of cathodically protected wellbores in Oklahoma, a suitable computer program for monitoring well casings was necessary. Although many computer programs have been developed for the monitoring of cathodically protected pipelines, these programs did not satisfy the well casing need because programs did not satisfy the well casing need because of difference in systems.

The software program developed satisfies all the reading requirements for the corrosion engineer, yet is simple enough for everyday use by field personnel. In addition, due to a large geographical area, an adequate means of data transmission also had to be established so that appropriate control could be maintained from a central location.

Introduction

Monitoring of oilfield data has always been a cumbersome task due to the large number of wells operated by many companies. One important set of readings is from the cathodic protection (CP) systems which are installed on well casings. Cathodic protection systems which are not properly maintained protection systems which are not properly maintained can lead to accelerated failures on well casings. Furthermore, depending on the number of wells, the monitoring of these systems utilizing contract labor can be expensive.

MOBIL E and P U.S. DMDT, and the CORRPRO/DMDT Joint Venture have jointly developed a new software program, titled "WELLBASE", to effectively monitor a large number of cathodic protection systems. These readings, after downloaded to a computer, lead to exception reports and identify locations which need adjustment, repair, or are not sufficiently protected. The monitoring is done with electronic data transfer to minimize to data entry by the operator.

" WELLBASE" requires a field data collector to collect the data and the software program to evaluate the data. Data exchange is done via a modem to upload and download data. The software program is also capable of transmitting data via a company's mainframe computer so that data can be made available to other locations (i.e. centralized engineering groups).

The reporting capability provides all the necessary reports for the maintenance personnel to repair systems promptly, along with other user-defined reports. The graphing capability allows the user to monitor various trends and fluctuations in the data.

Use of the above technology will save data collection time in the field, eliminate manual data entry and data transfer, provide a quick means to identify problems, make the data available quicker, and allow problems, make the data available quicker, and allow companies the effectively monitor the CP systems on their own.

A beta version of WELLBASE and installed in three Mobil locations during November, 1990. Program modifications and changes are being made, "bugs" are being fixed, and it is anticipated that WELLBASE will be fully functional by mid-year 1991.

Background

Before proceeding further, a brief description of cathodic protection and rectifiers is in order. The basic idea of cathodic protection is very simple. Any complications involved arise during the application of this basic idea.

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