The first commercial oil well was drilled in Pennsylvania in 1859 at a site along Oil Creek just south of Titusville. But it was not until 1956 that PA began permitting new drilling in coal areas, and not until 1963 that all new drilling required a permit. The Oil and Gas Act of 1984 required well operators to register all oil and gas wells, which had not been registered under previous law. A 1992 amendment to the Oil and Gas Act allows DEP to designate an abandoned well, with no identifiable owner/operator in the recent past, as an “orphan well”. Orphan well status, when approved by DEP, exempts the landowner or leaseholder from the obligation to plug such wells. In the period before regulation, many wells were abandoned without proper plugging and there are few records of their exact location.
It has long been known that the bore hole created by oil, gas and water wells can act as a conduit and allow substances from normally separate layers to combine and in some cases contaminate other layers. To prevent this problem wells are cased using metal and cement. When done properly this protective layer does its job. The problem is it does not last forever. Cement cracks, pipes rusts and in some cases the job just wasn't done right in the first place. And the casing only goes down to about 50 feet below the last usable aquifer. During World War II the casing from many wells was removed to turn in as scrap metal for the war effort. When these thing happen there is a problem.
A map of Abandoned Wells found by Venango PaSEC and wells plugged by DEP
See the Map
Photos of some abandoned wells
Click on image for larger view
Abandoned Well: A well that has been out of production for a year or more. (Wells can be on "inactive" status for years.)
OIL AND GAS MANAGEMENT PRACTICES SECTION IX
INACTIVE STATUS AND WELL PLUGGING
A. Inactive Status and Abandonment
If a permitted or registered well is not being operated or produced the Department will grant a request for inactive status for 5 years if the application meets the requirements of section 204 of the act (2001). If the well is idle for 12 months and no request for inactive status has been received then the well is considered abandoned and the operator must plug it in accordance with statutes and regulations.
The following two photos are of a conventional gas well. (No horizontal legs)