Method of using composites in the treatment of wells
First Claim
1. A method of treating a subterranean formation or a wellbore which comprises introducing into the formation or wellbore a well treatment composite comprising a well treatment agent adsorbed onto a water-insoluble adsorbent, wherein the composite is prepared by precipitating the well treatment agent from a liquid while the well treatment agent is being adsorbed onto the water-insoluble adsorbent and further wherein the well treatment agent is precipitated in the presence of a metal salt.
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Abstract
A well treatment composite comprising a well treatment agent adsorbed onto a water-insoluble adsorbent may be prepared by precipitating the well treatment agent, in the presence of a metal salt, from a liquid while the well treatment agent is being adsorbed onto the water-insoluble adsorbent. After a treatment fluid containing the composite is introduced into a well or a subterranean formation, the well treatment agent is slowly released from the composite. The composite permits a continuous supply of the well treatment agent into a targeted area and is particularly effective in high pH treatment fluids.
70 Citations
37 Claims
- 1. A method of treating a subterranean formation or a wellbore which comprises introducing into the formation or wellbore a well treatment composite comprising a well treatment agent adsorbed onto a water-insoluble adsorbent, wherein the composite is prepared by precipitating the well treatment agent from a liquid while the well treatment agent is being adsorbed onto the water-insoluble adsorbent and further wherein the well treatment agent is precipitated in the presence of a metal salt.
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37. A method of controlling the rate of release of a well treatment agent in a wellbore comprising introducing into the wellbore a well treatment composite comprising a well treatment agent adsorbed onto a water-insoluble adsorbent, wherein the composite is prepared by precipitating the well treatment agent from a liquid while the well treatment agent is being adsorbed onto the water-insoluble adsorbent and further wherein the well treatment agent is precipitated in the presence of a metal salt.
Specification