APPLICATION DATA

The Application Data Questionnaire is the key to a successful runlife of filters as well as the down-hole pump. For us to be able to give our customers the correct application and the most runlife out of their equipment, it is essential that we receive correct information and as much information as possible. Therefore, it is important to answer all of the questions in the questionnaire.

Why are these questions so important? We know Stanley Filters are not for every well and every application. By answering all of the questions we can determine which application is best for the customer or whether or not the well is a filter candidate.

The following is a breakdown of each question and why the information is so important. A combination of questions answered will determine the filter to be installed in the well.

1. Pump size, length, unit stroke and strokes per minute:

a. To determine the size and length of the filter.

b. To determine the maximum fluid the pump should be producing.
To determine the maximum velocity at pump intake.

2. Insert pump, Tubing pump, ESP, P.C., Jet, Gas Lift:
a. To determine size, length and style of filter;

(1.) Insert pumps &/or tubing pumps may use either a rod run or tubing filter.

(2.) Electrical Submersible Pumps (ESP’s) always use tubing filters.

(3.) Other styles of artificial lift, amounts of fluid to be moved and size of abrasives will determine the size and style of the filter to be used.

3. Size of Hold-down, Cup, Mechanical, Top or Bottom:

a. The data provided in these questions will determine the thread size of the filter as well as whether or not it is a rod run or tubing filter (i.e.) a 1 25/32" hold-down may use either a .75" (1.91 cm.) or 1" (2.54cm.) thread on the bottom nut to accommodate the gas anchor or strainer nipple. A 2.25" (5.72cm.) bottom hold-down, cup type, normally has an 1.25"(3.18 cm.) thread for the gas anchor or strainer nipple. If the hold-down is a top hold-down the insert pump must go through the seating nipple and the thread size for the gas anchor or strainer nipple could be smaller. This will determine the thread size of the filter to be used.

4. At what depth is pump set, how long is pump lasting?

a. We need to know where the pump is set. Is it above the perforations, in the perforations, or below the perforations?

(1.) Above the perforations is always best for the filter. This will allow most of the abrasives coming into the well to settle out, therefore keeping most of the abrasives away from the filter and the pump.

(2.) If we set the filter across from the perforations the filter will have to try to filter everything that enters the casing. If the well produces large quantities of gas, it could have a sand blasting effect on the filter media and shorten the runtime and life of both the filter and the pump. This is the least desirable place to set a filter.

(3.) Below the perforations would be our second choice of placing the filter. With the filter set below the perforations all of the abrasives will pass by the filter, but without the force it would have to withstand by being across from the perforations.

b. The shorter the runtime, the more filter the customer will need. With a larger, longer filter we can slow the velocity of the fluid. By slowing the velocity of the fluid the filter absorbs more like a sponge and the abrasives do not penetrate into the filter media as fast or as deep. (See Velocity Formula)

5. Tubing size, Tubing Anchor, Set where in string:

a. Rod run filters;

(1.) 2.375" tubing: 1000 series filters only, due to the I.D. of the seating nipple and tubing.

(2.) 2.875" tubing: 1250 or 1500 series filters. Either filter will easily pass through the tubing and the I.D. of a 2.25" (5.72 cm.) seating nipple.

(3.) 3.5" tubing: 1500 Series filters. This filter will pass through the I.D. of the tubing and the seating nipple.

b. Tubing filters;

(1.) The size of the tubing will determine the size of the filter and/or the thread size of the filter.

c. Tubing Anchor;

(1.) Movement of the tubing string can cause damage to a fiberglass filter and premature failure of the filter and pump. To alleviate this, we recommend a tubing anchor be set as close to the pump as possible.

7. b. For best results we recommend filters not be run inside a mud/gas anchor. However, when the customer insists on using a mud/gas anchor we suggest using one size larger tubing than the production string and at least 60’ if possible (see question 15).

If the well is an open hole well, we prefer the filter be set in the casing, not in the open hole.

When sizing tubing filters it is important to have the correct I.D.’s in order to give the right application. If the customer has 5.5" casing, but has a liner, it is important to know where the liner begins and what size, due to the O.D.’s of the tubing filters.

A TUBING FILTER MUST NOT BE RUN IF THE I.D. OF THE LINER IS SMALLER THAN 4.0". (PLEASE NOTE GRAVEL PACK QUESTIONS)

By knowing the total depth of the well we can determine how much room, if any is left below the pump. We can suggest the customer use a larger filter if one is needed, and we can also calculate how much fill, if any, the customer may have in his well.

Perforations: How many sets and where will help the customer know where to set the filter(s).

8. Static fluid level, Fluid above pump (while pumping), Is well pumping off?

a. To determine bottom hole pressure.

b. To determine if the well is heaving sand.

c. To determine if pump is producing at maximum efficiency.

How much gas the well is producing could effect the life of the filter. Higher volumes of gas can cause damage to the filter media by forcing the abrasive particles into the media (with a sand blasting effect).

9. Gravity of the oil: Lower gravity oils have the tendency to hold the sand against the filter media causing the filters to plug faster than they should.

a. Recommendations for filters and gravities;

1. Standard filter application: The lowest gravity oil we recommend filtering is 18 gravity at 120 F. (35 C.) or 13 gravity at 170 F. (62 C.) and at least a 50% water cut (see chart).

9. b. Total daily production dictates which filter size and length the customer will need. It also allows us to verify the pump is working at maximum capacity and that the well is not pumping off.

1. High volumes of fluid and abrasives require a larger filter. By installing the larger filters we slow the velocity of the fluid and extend the runtimes of all the equipment.

2. Smaller filters with less length, moving high volumes of fluid, will plug faster. The pump creates a vacuum and will pull in the filter media, causing damage to the filter and the production equipment.

10. Casing pressure: To determine how stable the formation and production are. Is well flowing: To determine if well is over produced, causing formation damage.

Bottom hole temperature: Stanley filters are rated to different temperature, see chart;

11. If paraffin is solidifying in the pump a filter must not be used. If the paraffin is breaking out in solution, in the tubing, the customer must clean the tubing before installing a rodrun filter.

12. Corrosion or scale problems:

a. If corrosion is present we recommend a brass rodrun filter or fiberglass tubing filter.

b. The filters have much more open area than the pump, therefore it will take longer for the scale to adhere to the filter. We recommend the customer treat with chemicals.

13. To date the filters have not been effected by any chemical treatment our customers may have used. This information is required for general knowledge of the well conditions. Large slugs could cause high volumes of solids from interface to plug filters.

14. Our recommendation is to not run a filter in a mud/gas anchor if possible, due to the breathing action of the filters. If a mud/gas anchor must be used we recommend it be one size larger than the production string, if possible. A closed mud/gas anchor will hold any abrasive material that is kept away from the pump, therefore this could shorten the life of the filter and the pump.

Stanley Filter Company
10061 E. 52nd Street
Tulsa, OK 74146