Downhole Chemical Delivery For Oil And Gas Wells
A method of reducing the cost and environmental impact of chemicals used in hydraulic fracturing is to use a proppant that is coated with at least two chemicals, where each of those chemicals are useful in treating a well. By coating at least two chemicals onto the proppant the amounts of chemicals required to treat a well are reduced by delivering the chemicals to only the areas that require treatment. Additionally mixing issues are avoided as only a single proppant or substrate is used in the well.
1 . A well treatment material comprising:
a substrate having two or more coatings without an intervening adhesive layer between the substrate and the first coating ;
wherein the substrate is suspended in a fluid, and wherein each coating is a material useful for treating a well.
2 . The well treatment material of claim 1 wherein the substrate is a proppant.
3 . The well treatment material of claim 2 wherein the proppant is a sand.
4 . The well treatment material of claim 2 wherein the proppant is a natural occurring organic material.
5 . The well treatment material of claim 2 wherein the proppant is a synthetic material.
6 . The well treatment material of claim 1 wherein the materials useful for treating a wellbore are a friction reducer, a gelling agent, a clay control agent, a biocide, a scale inhibitor, a chelating agent, a gel-breaker, an oxygen scavenger, an antifoamer, a crosslinker, a wax inhibitor, a corrosion inhibitor, a de-emulsifier, a foaming agent, or a tracer.
7 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a friction reducer.
8 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a gelling agent.
9 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a clay control agent.
10 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a biocide.
11 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a scale inhibitor.
12 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a chelating agent.
13 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a gel-breaker.
14 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is an antifoamer.
15 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a crosslinker.
16 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a wax inhibitor.
17 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a corrosion inhibitor.
18 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a de-emulsifier.
19 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a foaming agent.
20 . The well treatment material of claim 1 wherein one of the materials useful for treating a wellbore is a tracer.
21 . A method of making a well treatment material, comprising:
coating a substrate with a first coating comprising a first well treating agent and a second coating comprising a second well treating agent without an intervening adhesive layer between the substrate and the first coating.
22 . The method of making a well treatment material of claim 21 wherein the substrate is suspended in a fluid.
23 . The method of making a well treatment material of claim 21 wherein additional layers of a additional well treating agent are coated onto the substrate.
24 . The method of making a well treatment material of claim 21 wherein the substrate is a proppant.
25 . The method of making a well treatment material of claim 21 wherein the proppant is a sand.
26 . The method of making a well treatment material of claim 21 wherein the proppant is a natural occurring organic material.
27 . The method of making a well treatment material of claim 21 wherein the proppant is a synthetic material.
28 . The method of making a well treatment material of claim 21 wherein the materials useful for treating a wellbore are a friction reducer, a gelling agent, a clay control agent, a biocide, a scale inhibitor, a chelating agent, a gel-breaker, an oxygen scavenger, a defoamer, a crosslinker, a wax inhibitor, an anti-sludging agent, a corrosion inhibitor, a de-emulsifier, a foaming agent, or a tracer.
29 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a friction reducer.
30 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a gelling agent.
31 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a surfactant
32 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a clay control agent.
33 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a biocide.
34 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a scale inhibitor.
35 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a chelating agent.
36 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a gel-breaker.
37 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is an oxygen scavenger.
38 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a defoamer.
39 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a crosslinker.
40 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a wax inhibitor.
41 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is an anti-sludging agent.
42 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a corrosion inhibitor.
43 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a de-emulsifier.
44 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a foaming agent.
45 . The method of making a well treatment material of claim 21 wherein one of the materials useful for treating a wellbore is a tracer.