Plugging method integrating channel blocking and leakage plugging

Abstract

The invention belongs to a method for plugging a casing leakage well section and external casing channeling in an oil well, and particularly relates to a plugging method integrating channel blocking and leakage plugging. According to the plugging method integrating channel blocking and leakage plugging, a chemical composite plugging agent RB / H-I, high-temperature resistant composite resin and G-level oil well cement are adopted and combined to plug the casing leakage well section and the external casing channeling. The plugging method has the benefits as follows: the plugging method is simple, the construction is convenient, the plugging effect is good, an oil layer does not leak water during production, the plugging success rate for each time is up to 98%, and the production benefits of the oil well is increased.

Description

technical field [0001] The invention belongs to a method for sealing the leaky section of the casing in the oil well and the channeling outside the pipe, in particular to an integrated sealing method for channeling and leakage sealing. Background technique [0002] At present, due to many factors such as geology in the oilfield development process, the casing leakage in the oil well is caused. One round of steam injection production will cause damage to the cement stone outside the casing, resulting in leakage outside the casing. Channeling causes top water channeling below bottom water channeling upward, causing high water content in oil wells and seriously affecting oil well production. The traditional plugging method for casing leaking well sections and channeling outside the pipe is to use cement extrusion for plugging. Due to the high fluidity of cement density Well, the penetration is strong, how much cement is squeezed in will be lost along the loose area, and the sto...

AI Technical Summary

Problems solved by technology

[0002] At present, due to many factors such as geology in the oilfield development process, the casing leakage in the oil well is caused. One round of steam injection production will cause damage to the cement stone outside the casing, resulting in leakage outside the casing. Channeling causes top water channeling below bottom water channeling upward, causing high water content in oil wells and seriously affecting oil well production. The traditional plugging method for casing leaking well sections and channeling outside the pipe is to use cement extrusion for plugging. Due to the high fluidity of cement density Well, the penetration is strong, how much cement is squeezed in will be lost along the loose area, and the stock near the well is very small. Even if a certain strength is formed, under the pressure of 10MPa, the cement will move backward and form new cracks. Repeated construction is also difficult to achieve the construction effect, and the success rate of one-time plugging can only reach 40%