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High Efficiency Radiation-Induced Triggering for Set-On-Command Compositions and Methods of Use

a radiation-induced trigger and composition technology, applied in the direction of sealing/packing, chemistry apparatus and processes, borehole/well accessories, etc., can solve the problems of excessive woc and compromise of the structural integrity of the cemen

Inactive Publication Date: 2014-07-31
HALLIBURTON ENERGY SERVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides methods for controlling the setting of fluids or slurries used in hydrocarbon exploration and production operations, particularly in subterranean cementing operations. This is achieved by adding a polymerizable additive to the fluid or slurry and subjecting it to a radiation dose to activate the additive and allow the fluid or slurry to set. This results in improved control over the setting process, making it more efficient and effective.

Problems solved by technology

If operations are resumed prior to the cement obtaining sufficient mechanical strength, the structural integrity of the cement can be compromised.
As such, systems generally are over-engineered to have very long setting (or thickening) times in order to ensure that the mix remains fluid until all of the cementitious material is in place, which can result in excessive WOC.

Method used

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  • High Efficiency Radiation-Induced Triggering for Set-On-Command Compositions and Methods of Use
  • High Efficiency Radiation-Induced Triggering for Set-On-Command Compositions and Methods of Use
  • High Efficiency Radiation-Induced Triggering for Set-On-Command Compositions and Methods of Use

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056]Cement slurry samples were prepared by mixing the following ingredients: 400 grams of a class H cement (Lafarge, Joppa Ill.), 160 grams of water (w / c=0.40), 8.0% by weight of solids (bwos) acrylamide, 0.42% bwos N,N-methylene-bis-acrylamide as a crosslinker, 0.50% bwos maltodextrin as a set retarder, 0.50% bwos HR-25 as a set retarder, 0.20% bwos Diutan gum as a rheology modifier, 0.10% bwos SnCl2 as an oxygen scavenger, and 1.0% bwos SYLOID® RAD 2105 silica gel (Grace Performance Chemicals, USA).

[0057]The slurry was mixed for 45 seconds on a Waring blade mixer as per the API mixing schedule. The slurry was split into two samples. One sample was exposed for 20 seconds to bremsstrahlung radiation produced by focusing an electron beam of 5-6 MeV energy onto a tungsten target and placing the sample in a vial at the other end of the tungsten target and thereby exposing the sample to the bremsstrahlung photons. The other sample was not irradiated and kept as a control. The control ...

example 2

[0058]A cement / sand slurry was prepared similar to that of Example 1, except that the 1% SYLOID RAD particles were not included, and 200 grams of the class H cement was replaced with 200 mesh sand for a 50:50 mixture of cement and silica flour.

[0059]The slurry was mixed for 45 seconds on a Waring blade mixer as per the API mixing schedule. The slurry was split into two samples. One sample was exposed for 30 seconds to bremsstrahlung radiation produced by focusing an electron beam of 5-6 MeV energy onto a tungsten target and placing the sample in a vial at the other end of the tungsten target and thereby exposing the sample to the bremsstrahlung photons. The other sample was not irradiated and kept as a control. The control sample remained fluid. The irradiated sample had been crosslinked and displayed a freestanding solid-like behavior.

example 3

[0060]Silica flour slurry samples were prepared by mixing the following ingredients: 400 grams of SSA-1 silica flour (Halliburton, Houston, Tex.) 168 grams of water (w / c=0.42), 0.18wt % Ca(OH)2 per 100 grams water, 8.0% by weight of solids (bwos) acrylamide, 0.42% bwos N,N-methylene-bis-acrylamide as a crosslinker, 0.20% bwos Diutan gum as a rheology modifier, 0.10% bwos SnCl2 as an oxygen scavenger.

[0061]The slurry was mixed for 45 seconds on a Waring blade mixer as per the API mixing schedule. The slurry was split into two samples. One sample was exposed for 30 seconds to bremsstrahlung radiation produced by focusing an electron beam of 5-6 MeV energy onto a tungsten target and placing the sample in a vial at the other end of the tungsten target and thereby exposing the sample to the bremsstrahlung photons. The other sample was not irradiated and kept as a control. The control sample remained fluid. The irradiated sample had been crosslinked and displayed a freestanding solid-like...

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Abstract

Compositions and methods for hydrocarbon exploration and production operations, such as subterranean cementing operations that allow for greater control over the setting of fluids or slurries used during such operations including placing a sealant composition having a polymerizable additive into a wellbore penetrating a subterranean formation, and subjecting the sealant composition to a radiation dose of from about 1 to about 1000 grays, so as to form a seal therein.

Description

BACKGROUND[0001]The present invention generally relates to hydrocarbon exploration and production operations, such as subterranean cementing operations, and more particularly to compositions and methods that allow for greater control over the setting of fluids or slurries used during such operations.[0002]Natural resources such as oil and gas located in a subterranean formation can be recovered by drilling a wellbore down to the subterranean formation, typically while circulating a drilling fluid in the wellbore. After the wellbore is drilled, a string of pipe, e.g., casing, can be run in the wellbore. The drilling fluid is then usually circulated downwardly through the interior of the pipe and upwardly through the annulus between the exterior of the pipe and the walls of the wellbore, although other methodologies are known in the art.[0003]Hydraulic cement compositions are commonly employed in the drilling, completion and repair of oil and gas wells. For example, hydraulic cement c...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B33/00
CPCE21B33/00E21B33/14C09K8/44C09K8/467C04B28/02C04B40/0003C04B2103/0062C04B24/163C04B24/2611C04B24/2623C04B24/2641C04B24/2652C04B24/283C04B2103/46
Inventor BALDASARO, NICHOLASGUPTA, VIJAYLEWIS, SAMUEL J.
Owner HALLIBURTON ENERGY SERVICES INC