Method to repair leaks in a cemented annulus
a cemented annulus and leak repair technology, applied in the field of cemented annulus, can solve the problems of gas leakage and surface leakage in old wells, and achieve the effect of preventing leakag
Inactive Publication Date: 2014-09-18
CSI TECH
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Benefits of technology
The patent describes a method of providing pressure containment in a well without the need for mechanical isolation of the wellhead. A set cement is used, which contains flow paths that can release pressure from a subterranean zone. The method involves creating a reception area at the top of the well, placing a containment cement slurry in this area, and installing a tubular member. A settable fluid is then injected into the flow paths of the well annulus using an injection delivery system. This fluid can be a resin or a micro-fine cement slurry. The method may also involve applying a squeeze pressure to the fluid and allowing it to harden within the flow paths. The technical effect of this invention is that it provides a safe and effective means for containing pressure in a well without requiring mechanical isolation of the wellhead.
Problems solved by technology
Gas leaks can occur in this surface casing annulus which ultimately can escape into the environment.
As readily understood by those of ordinary skill in the art, these leaks can lead to problems.
Also, these surface leaks can be present in old wells as well as recently drilled wells.
Method used
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[0013]Referring now to FIG. 1, a schematic illustration of a prior art wellbore 2 is depicted, wherein the wellbore 2 contains a plurality of casing strings extending into subterranean zones. More particularly, an operator will drive a drive pipe “DP” or conductor pipe and thereafter drill an initial hole with a drill bit. Next, the operator will place a surface casing 4 within the drive pipe DP. The operator will then place cement into the surface casing annulus 6 through known techniques and allow the cement to set. A typical cement slurry for the surface casing annulus 6 is commercially available from Halliburton Energy Services under the name HalCem™. As well understood by those of ordinary skill in the art, the depth of the surface casing will vary, but generally is placed from 300′ to about 2000′.
[0014]Next, the operator will drill within the surface casing 4, and concentrically place the intermediate casing 8 within the newly drilled hole. After placement of the intermediate ...
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A method of providing pressure containment of a well having a well annulus. The well annulus contains a set cement, and the cement contains flow paths which communicate a well pressure to the surface. The method includes placing a containment cement slurry in a reception area at the top of the well and installing an injection delivery system within the reception area. The method may further include preparing a settable fluid for injection into the flow paths and injecting the settable fluid through the injection delivery system into the flow paths. In one disclosed embodiment, the injection delivery system may include a series of injection tubulars configured to deliver the settable fluid to the flow paths. The injection delivery system may include a template having a first, second, third and fourth injection tubular. According to this disclosure, the method may also include allowing the settable fluid to set, monitoring the pressure of the well annulus, and performing remedial well action based on the observed pressures.
Description
BACKGROUND OF THE INVENTION[0001]This invention relates to a cemented annulus in an oil and gas well. More specifically, but not by way of limitation, this invention relates to a method for repairing leaks to a cemented annulus in a well.[0002]Oil and gas wells are constructed using steel pipe known as casing to line and structurally support the wellbore. Typically, a drive pipe is driven into the ground followed by a large surface casing that is run a few hundred feet into a drilled hole. As well understood by those of ordinary skill in the art, cement is pumped around the surface casing to seal the space between the casing and the drive pipe. The cement supports the casing, isolates the subterrean reservoirs and protects ground water zones. The operator then drills a deeper wellbore and a smaller diameter casing, known as the intermediate casing, is run into the surface casing to the bottom of the wellbore. The intermediate casing is also cemented into the ground, with the cement ...
Claims
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Login to View More IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor WATTERS, LARRYBROWN, DAVID D.HOLLIS, SEAN
Owner CSI TECH