At present we observe “declining” of the production at a considerable number of gas fields. In this context many wells experience reduction of formation pressures and elevation of gas-water contact (GWC). This leads to intensive water intrusion into the gas-saturated part of formation. Over a period of years squeeze jobs with the use of different materials have been performed at gas fields to reduce formation water influx. During such jobs the following techniques were used: use of hoisting equipment, plug-back jobs, retrieval of tubing after well, etc. All the workover and completion techniques require considerable time. The works are not always successful.

Taking into account the relevance of improving the efficiency of squeeze jobs in gas wells, scientists from Oil and Gas Research Institute of the Russian Academy of Sciences together with the sepcialists of Gazprom Dobycha Urengoy proposed an alternative solution water shutoff in gas wells with the use of coiled tubing equipment without well killing. This technology is meant for reducing water influx and for water shutoff operations in gas wells by injecting a special polymer-gel system into formation.

.....

Full version of the article can be downloaded here.