Method for controlled placement of oilfield chemicals and composition useful for practicing same
AssigneeBaker Hughes Incorporated
InventorSamuel Everett Campbell
Life of this patent
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Abstract
Disclosed is a method for introducing additives into an oil, gas, or water injection well or pipeline in solid form at a location other than at the bottom. The method is practiced using pellets having a density sufficient to suspend the pellet at a top phase, bottom phase or at the interface of two phases of fluid within a wellbore. The pellets are prepared from a pellet matrix, such as an ethoxylated wax, and a weighting agent as well as an additive. By varying the amount of weighting agent, the density of the pellet can be varied to suspend it at a desired point to for a time sufficient to deliver the additive to the desired point within the wellbore.
Claims17
A method for treating an oil or gas well having a column of fluid within the wellbore by introducing chemicals into the column of fluid comprising introducing the chemicals into the column of fluid in the form of pellets having a density less that that of the fluid at the well bottom and about the same as the fluid at the point within the wellbore at which it would be desirable to introduce the chemicals.
The method of claim wherein the pellets are prepared with a weighting agent selected from the group consisting of calcium sulphate, magnesium sulphate, calcium carbonate, titanium oxide, aluminum oxide, potassium chloride, sodium chloride, and mixtures thereof.
A pellet for treating an oil or gas well having a column of fluid within the wellbore including a pellet having at least two layers, a first layer surrounding a second layer, and at least one additive, and a weighting agent, wherein the density of the first layer is different from the density of the second layer.
A method for treating a pipeline having free fluids by introducing chemicals into the fluid comprising introducing the chemicals into the fluid in the form of pellets having a density less that that of the fluid at the lowest point and about the same as the fluid at the point within the pipeline at which it would be desirable to introduce the chemicals.
A pellet for treating a pipeline having free fluids within the wellbore including a pellet having at least two layers, a first layer surrounding a second layer, and at least one additive, and a weighting agent, wherein the density of the first layer is different from the density of the second layer.
Dependencies are inferred from the claim text.