SELECT FS-1251 STICKS are primarily used to remove water from gas wells and increase gas production. The foaming action decreases the hydrostatic back-pressure which increases gas production that further enhances the foaming action until the well unloads.
SELECT FS-1251 STICKS can be used to remove fluid from gas-condensate wells and flowing oil wells. For gas-condensate wells with more than 75% condensate, it is recommended to use Select OIL FOAM STICKS™ in conjunction with SELECT FS-1251 STICKS.
SELECT FS-1251 STICKS can be used to increase the swabbing efficiency and life of swab cups. The extremely slick coating along with the foaming action increases efficiency and life of the swab cups and allows the well to flow easier. The perforations are often cleaned as a result of the surfactants and swabbing action.
SELECT FS-1251 STICKS are used in water injection wells in combination with ACID STICKS® to help reduce injection pressures. Surfactants contained in SELECT FS-1251 STICKS can help remove oil coatings on scale. This helps the ACID STICKS® react with the exposed scale.
SELECT FS-1251 STICKS are an economical way to remove water from gas wells without using expensive well service operations such as swabbing, jetting and coiled tubing or installing artificial lift and siphon strings.
TREATMENT DETERMINATION & PROCEDURE FOR WATER REMOVAL
The number of FS-1251 STICKS to be used is based on the volume of water above the perforations. Field tests indicate that the best results were achieved by using a larger initial slug treatment of ½ to 1 percent by weight of FS-1251 STICKS to water above the perforations. A treatment of ½ to 1 percent by weight would require 1.75 to 3.50 lbs. of stick per barrel of water.
|FS-1251 STICK SIZES||STICKS PER BBL (Initial Slug Treatment)|
|SENIOR (1 5/8” X 18”)||1 to 2 Sticks per 1 BBL of water|
|JUNIOR (1 3/8” X 16”)||2 to 3 Sticks per 1 BBL of water|
|JUNIOR (1 ¼” X 15”)||2 to 4 Sticks per 1 BBL of water|
|THRIFTY (1” X 15”)||3 to 6 Sticks per 1 BBL of water|
|MIDGET (5/8” X 15”)||8 to 17 Sticks per 1 BBL of water|
This amount is recommended for an initial slug treatment. In many cases, removing the top few hundred feet of fluid may be sufficient to allow the production of natural gas to blow out the remaining fluid in the well. To determine the optimum amount for periodic treatments you may choose to gradually reduce the initial treatment amount until the most economical point is reached. Periodic treatments with FS-1251 STICKS may be necessary to prevent production decline due to the gradual water build-up. It is much easier to maintain gas production with regular insertion of FS-1251 STICKS than it is to kick off a dead well. Gas bubbling through water is necessary to create foam. If a well is totally dead, GAS STICKS™ may be used in conjunction with FS-1251 STICKS to provide agitation energy.
THE MOST COMMON PROCEDURE
Shut-in the well and drop sticks through a lubricator. Wait 45 seconds until sticks contact top of fluid then slowly return well to normal production. Repeat procedure if or when it becomes necessary. FOR HIGH RATE WELLS (after sticks have contacted the top of fluid) flow well at about 25% of pretreatment rate for about 20 minutes or until foam reaches surface then return to normal rate. FOR SHALLOW OR LOW RATE WELLS leave well flowing while dropping sticks if possible.
The stick will normally dissolve in 10 to 40 minutes depending on temperature, salt content, and relative water motion. FS-1251 STICKS are 100% soluble in water and insoluble in oil. The melting point of the sticks is 119ºF. The stick will dissolve in water in wells with BHT below 119º (just at a slower rate). Lab tests indicate the dissolving rate in 50,000 PPM moving brine water to be 36 minutes @ 100º, 12 minutes @ 120º, 4 minutes @ 140º, and 1 minute @ 180º. The dissolving time will decrease if the sticks are broken before dropping or if they break upon impact with the top of the fluid. The specific gravity is 1.09. The falling rate through fresh water is approximately 100 feet per minute. The sticks can free fall (through air) 3,000 feet in about 15 seconds. Gas moving up tubing will often change falling characteristics.
|SENIOR (1 5/8)||24/case||N/A||48/chest|
|JUNIOR (1 3/8)||36/case||42/pail||70/chest|
|JUNIOR (1 ¼)||36/case||45/pail||72/chest|
As with all industrial chemicals, contact with eyes or skin should be avoided. Wash thoroughly with water. Sticks should be stored in a cool dry place. Always remove stick from plastic bag or paper tube before using. Bag or tube can be used as a glove to avoid contact with hands.
DISCLAIMER OF LIABILITY
The information in this bulletin is believed to be accurate, however all recommendations are made without warranty since the conditions of use are beyond Select Industries, Inc. control. Select Industries, Inc. disclaims any liability in connection with the use of the information, and does not warrant against infringement by reason of the use of any of its’ products in combination with any other material or in any process.