Sand Retention - Brine Flow

Constien & Associates offers 2 types of sand retention testing using brine flow. These tests include the C&A Constant Rate Brine Flow Test and the C&A Cyclical Brine Flow Test.

C&A Constant Rate Brine Flow Test

  • This test is used to identify promising completion candidates; screen only or gravel pack.
  • This test is recommended to verify performance of the screen in a brine flow scenario.

The C&A Constant Rate Brine Flow Test is a constant rate test typically using 3% KCl which simulates an erosional-type failure of the formation onto the screen. This test uses a low volume fraction of solids diluted into a flowing brine stream at a flow rate of 200 ml/min. A constant flow rate is maintained until the maximum pressure drop of 200psi across the screen is reached, or until all the formation sand has been deposited. Samples of the brine with produced solids passing through the screen are collected at regular volumes and the concentration of solids is determined as a function of pounds of formation/ft2 of screen area versus total flow/ft2 of screen area. Generally speaking, the test length is related to the permeability of the formation along with the amount of formation material that passes through the screen. The higher the formation permeability and / or the more solids that are produced increase the time of the test and reduce the pressure in the system.

The C&A Constant Rate Brine Flow Test method is used to determine:

  • The amount of formation material that passes through the screen
  • The retained permeability of the screen
  • The pressure through the formation and screen as the formation is deposited
  • The size of the particles produced through the screen
 

C&A Cyclical Brine Flow Test

The C&A Cyclical Brine Flow Test is a constant drawdown test designed specifically for injector wells. Alternating flow from production direction to injection direction provides data to determine the performance of formation retention and flow capacity. Formation material is slurried in brine and displaced on to the test screen or test screen plus gravel pack. The formation is then stressed to 700psi net stress and flow of brine in the production direction is initiated. Samples of the brine with produced solids passing through the screen are collected at regular intervals and the concentration of solids is determined. Flow is alternated from production direction to injection direction. Solids production is allowed in the production direction only.

The C&A Cyclical Brine Flow Test is used to determine:

  • The amount of formation material that passes through the screen in the production direction.
  • The retained permeability of the screen
  • The size of the particles produced through the screen
  • The permeability of the formation plus screen at 700psi net stress in both injection and production direction.