Self-Adaptive Cement Systems

Inactive Publication Date: 2007-09-06
SCHLUMBERGER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] It has been found that the addition of salts such as sodium chloride or calcium chloride for instance favors the rheology of the systems thereby enabling increasing the con

Problems solved by technology

However, for various reasons, over time this sheath can deteriorate and become permeable.
None of these are immediately applicable to well

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Addition Procedure

[0019] The first step was to define the best addition process. As shown in table 1 below, dry blending induces lower effects on rheology and free water and leads to an easy mixing

TABLE 1DesignReferenceA1A2A3S1G (% bwoc)0.10.10.1Noteprehydratedprehydrated(static)dry blendedunder agitationat 2000 RPMduring 15minutes.Mixing rheologyTy (lbf / 100 ft2)2.32.81.43.2PV (cP)25.518.927.232.4BHCT rheology at 60° C.Ty (lbf / 100 ft2)24.621.227.352.8PV (cP)20.918.426.633.310′ / 1′gel25 / 1614 / 919 / 1115 / 13Free Water mL17trace2.5Sedimentation1.1410.40.7ppg

example 2

Influence of the Particle Sizes

[0020] For the S1 particles, the finer the particles, the higher the rheology and free water.

TABLE 2DesignReferenceS1 GS1 GMS1GSS1 (% bwoc)0.10.10.1Mixing rheologyTy (lbf / 100 ft2)2.31.42.76.7PV (cP)25.527.22941BHCT rheology at 60° C.Ty (lbf / 100 ft2)24.627.324.438.7PV (cP)20.926.635.640.910′ / 1′gel25 / 1619 / 1115 / 1212 / 9Free Water mL1trace24Sedimentation ppg1.140.410.9

example 3

[0021] This test shows that cement slurry with super-absorbent polymers S1 are compatible with conventional fluid loss control additive (flac). This shows that the composition of the present invention can still be optimized by the addition of conventional additives such as dispersing agent, fluid loss control agent, set retarder, set accelerator and anti-foaming agent.

TABLE 3DesignX3.1X3.2S1G (% bwoc)0.10.1Flac0.4Mixing rheologyTy (lbf / 100 ft2)1.47.9PV (cP)27.2104.7BHCT rheology at 60° C.Ty (lbf / 100 ft2)27.313.7PV (cP)26.612510′ / 1′gel19 / 1113 / 7Free Water mLtracetrace

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Abstract

A self-healing cement system includes cement, water and at least one additive that swells in contact with water from reservoir or from formation in the case of a structural failure in the set cement to provide a physical barrier in the zone of failure. Examples of such material include particles of super-absorbent polymer. These additives have the effect of making the cement self-healing in the event of physical failure or damage such as micro-annuli. The self healing property is produced by the contact of the water itself, the potential repair mechanism is thus activated if and when needed in case of start of loss of zonal isolation. Several super-absorbent polymers have been identified such as polyacrylamide, modified crosslinked poly(meth)acrylate and non-solute acrylic polymers.

Description

TECHNICAL FIELD OF THE INVENTION [0001] The present invention relates to adaptive cement systems. In particular, the invention relates to cement systems which are “self-healing”, i.e. system which can adapt to compensate for changes or faults in the physical structure of the cement, or which adapt their structure after the setting phase of the cement in the cementing of oil, gas, water or geothermal wells, or the like. BACKGROUND OF THE INVENTION [0002] During the construction of underground wells, it is common, during and after drilling, to place a liner or casing, secured by cement pumped into the annulus around the outside of the liner. The cement serves to support the liner and to provide isolation of the various fluid-producing zones through which the well passes. This later function is important since it prevents fluids from different layers contaminating each other. For example, the cement prevents formation fluids from entering the water table and polluting drinking water, o...

Claims

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Application Information

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IPC IPC(8): C04B24/00C04B7/00C04B40/00C04B28/02C04B40/06C09K8/467
CPCC04B24/2652C04B28/02C04B40/0675C04B2103/0049C04B2103/0051C04B2103/0062C04B2111/00146C04B2111/00155C09K8/467C04B20/0076C04B22/124C04B40/0641C04B2103/12C04B2103/22C04B2103/408C04B2103/46C04B2103/50C04B24/2641C04B40/0259C04B40/0071C04B24/2676C04B40/0028C04B14/08C04B20/008
Inventor LE ROY-DELAGE, SYLVAINEMARTIN-BEUREL, MURIELDISMUKE, KEITHNELSON, ERIK
Owner SCHLUMBERGER TECH CORP
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