Annular Velocity Enhancement With Gas Lift as a Deliquification Method for Tight Gas Wells With Long Completion Intervals
- Steven Anthony Pohler (Marathon Oil Corporation) | William David Holmes (Marathon Oil Corporation) | Stuart Cox (Marathon Oil Corporation)
- Document ID
- Society of Petroleum Engineers
- SPE Unconventional Gas Conference, 23-25 February, Pittsburgh, Pennsylvania, USA
- Publication Date
- Document Type
- Conference Paper
- 2010. Society of Petroleum Engineers
- 2.2.2 Perforating, 1.8 Formation Damage, 3.1.1 Beam and related pumping techniques, 4.1.2 Separation and Treating, 5.4.2 Gas Injection Methods, 3.1.2 Electric Submersible Pumps, 3 Production and Well Operations, 1.6 Drilling Operations, 4.2.3 Materials and Corrosion, 4.1.5 Processing Equipment, 3.1.5 Plunger lift, 5.8.1 Tight Gas, 5.3.2 Multiphase Flow, 3.1.6 Gas Lift, 3.1 Artificial Lift Systems, 3.1.7 Progressing Cavity Pumps
- 0 in the last 30 days
- 907 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 8.50|
|SPE Non-Member Price:||USD 25.00|
It is common practice in the industry to complete multiple reservoirs in a single wellbore in order to establish commercial production rates from tight gas completions. In some cases these zones are separated vertically by several hundred to over a thousand feet. The deliquification of these completions is one of the most challenging problems facing our industry. Many of the deliquification methods currently being utilized are effective over only a portion of the wellbore. In many cases these methods do not allow for removal of liquid across the entire completed interval. If the liquid is not effectively removed from the well, the near wellbore region will become saturated with fluid and reduce the well's productivity. This paper will propose a new completion strategy which has been incorporated into the completion of tight gas wells to address the problems associated with deliquification of long completion intervals. Laboratory experiments and field data will be presented to quantify the effects of inadequate liquid removal. A case study will also be presented to demonstrate the successful application of this alternate completion strategy. This completion strategy applies to unconventional gas wells, vertical and horizontal gas wells.
It is common practice to complete tight gas wells with the tubing tail above the bottom perforation. This completion practice allows static liquid to stand across the lower set of perforations. Static liquid standing across the perforations promotes increased near well liquid saturations through a process of spontaneous imbibition. The imbibition process is a damage mechanism that can be present upon initial completion and continue throughout the productive life of the well if allowed to form through ineffective liquid removal / completion practices.
There are a number of different methods currently in use for the deliquification of gas wells. Some of the more common are plunger lift, chemical foam lift and conventional pumps (rod pumps, electric submersible pumps, progressive cavity pumps, etc.). Each method has drawbacks when it comes to deliqufiying wells with long completion intervals. Each of these methods are discussed in more detail in the body of the paper. Effective liquid removal can significantly improve overall well performance. However, an effective system cannot ignore the potential presence of a static liquid column. Current completion technology has been found to have limited effectiveness when long productive intervals are present. Therefore, we propose a modified continuous flow gas lift system which includes a packer and crossover system that allows for gas lifting the well below the bottom perforation. The detail of this completion process and its field applications will be discussed in the body of this paper.
|File Size||437 KB||Number of Pages||10|