Compositions and methods for enhancement of production of liquid and gaseous hydrocarbons
A well treatment composition designed for the simultaneous enhancement of the production of both liquid and gaseous hydrocarbons from the same reservoir on a non-selective basis. The well treatment composition includes a first surfactant and a second surfactant, wherein the second surfactant is selected from the group consisting of ethylenediaminealkoxylate, diethylenetriaminealkoxylate, ethoxylated alkylene amines, ethoxylated alkyl amines, propoxylated alkylene amines, propoxylated alkyl amines, ethoxylated-propoxylated alkylene amines and ethoxylated-propoxylated alkyl amines. The well treatment composition also includes a first solvent, a second solvent and water. Methods for using the well treatment composition include the steps of emplacing the well treatment composition into wells having high and low gas-to-oil ratios.
1. A well treatment composition comprising:
a first surfactant;
a second surfactant, wherein the second surfactant comprises ethylenediaminealkoxylate;
a first solvent;
a second solvent, wherein the second solvent is a co-solvent; and
water.
2. The well treatment composition of claim 1 , wherein the first solvent is immiscible with water and suspended or solubilized by the first and second surfactants as an internal phase within an external aqueous phase.
3. The well treatment composition of claim 1 , wherein the co-solvent is selected from the group consisting of short-chain alcohols and glycols.
4. The well treatment composition of claim 1 , further comprising a carrier fluid.
5. The well treatment composition of claim 1 , wherein the first solvent, second solvent, first surfactant and second surfactant are emulsified as an oil-internal emulsion where the first solvent is suspended or solubilized within the external water phase by the first and second surfactants.
6. The well treatment composition of claim 1 , wherein the well treatment composition comprises:
up to about 90% by volume of the first surfactant;
up to about 16% by volume of the second surfactant;
up to about 10% by volume of the first solvent, wherein the first solvent is d-limonene;
up to about 25% by volume of the second solvent, wherein the second solvent comprises a co-solvent or a mixture of co-solvents; and
up to about 30% by volume of the water.
7. The well treatment composition of claim 1 , wherein the well treatment composition is an emulsion or microemulsion.
8. The well treatment composition of claim 1 , wherein the first surfactant comprises ethoxylated tristyrylphenol.
9. The well treatment composition of claim 1 , wherein the first solvent comprises d-limonene and/or the co-solvent comprises isopropanol.
10. The well treatment composition of claim 1 , wherein the well treatment composition comprises 10 wt % to 30 wt % of the second solvent and 5 wt % to 30 wt % water.
11. The well treatment composition of claim 1 , wherein:
the well treatment composition is an emulsion or microemulsion;
the first surfactant comprises ethoxylated tristyrylphenol;
the first solvent comprises d-limonene; and
the second solvent comprises isopropanol.