Robert M. Parker, Texaco E&P
A true gas lock is really just a pocket of gas trapped between the standing valve and the traveling valve. It has enough pressure when the pump is extended (on the upstroke) to keep the standing valve from opening and admitting new fluid. But does not compress tightly enough when the pump is closed (on the downstroke) to lift the traveling valve off its seat. Since coming to the oilfield in 1975 I have seen, and dealt with a great number of sucker rod pumps that appeared to be gas-locked. I have also inspected, and listened to the sales pitch for, many devices that the inventors claim will solve this problem once and for all. I have had the opportunity to evaluate several of these "gadgets" in the field and found them wanting. Most often the devices fail prematurely, and several had no discernible effect. The claims for others bordered on the absurd. Yet, these devices persist and I have seen at least three inventors and or salesmen in the last six months. At least two of the ideas have merit, although not necessarily for the reasons that the inventors' claim. As a well technician for Texaco I have been involved in the company