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Cement slurry compositions and methods

A composition, a technology of cement slurry, applied in the direction of drilling composition, chemical instruments and methods, solid waste management, etc., can solve the problem of unsatisfactory reduction of entrained air and foam, not easy access to equipment, operating time and unacceptable cost etc.

Inactive Publication Date: 2015-12-23
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While any of the preceding options are effective in reducing entrapped air and foam in the slurry, the use of these options is not always feasible
For example, the operating time and costs associated with using additional equipment or additives may not be acceptable, or in some field locations, equipment may not be readily available
Furthermore, under certain operating conditions, some of these measures have proven less than satisfactory in reducing entrained air and foam

Method used

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  • Cement slurry compositions and methods
  • Cement slurry compositions and methods
  • Cement slurry compositions and methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The purpose of the first experiment was to evaluate the influence of the selected surfactants on the wettability, ie on the wettability of the surface of the polymer particles. For each selected surfactant, several aqueous solutions were provided, each containing a different amount of surfactant, including a first control solution containing a surfactant concentration of 0%. The contact angle of each solution was measured using a Tracker tensiometer from Teclis. Because of some experimental difficulties in measuring contact angles on powders, contact angle measurements were performed on rubber bands.

[0049] The results obtained are provided in figure 1 , where the average measured contact angle is plotted as a function of the surfactant weight concentration in water for the different solutions tested. As shown, the value of the contact angle for the surfactant-free aqueous solution was 110 degrees. This measurement on the first solution confirmed the poor wettabili...

Embodiment 2

[0052] In order to evaluate the degree of air entrapment by the selected surfactants during mixing, a series of foam tests were performed. A Warring mixer was used to mix 200 mL of aqueous solutions containing two different concentrations of surfactants, 0.04% and 0.1%. To reproduce the same mixing speed used in the standard API method for cement slurries, the solution was first mixed at 4000 revolutions per minute (rpm) for 35 seconds, and then at 12000 rpm for the same time. After mixing, the volume of each solution was measured as a function of time to determine the amount of air bubbles generated and retained in the solution during mixing.

[0053] exist figure 2 In, for a solution containing 0.04% surfactant, the volume V measured after mixing 混合后 with initial volume V 0 The ratio between is plotted as a function of time. For each of the three surfactants tested, the ratio V 混合后 / V 0 It is highest at t=0 just after mixing and then generally decreases with time. Th...

Embodiment 3

[0057] The purpose of another experiment was to determine the effect of the addition of surfactants on the dispersion of rubber particles in water and on the mixability of cement slurries. image 3 Two descriptions of aqueous column containing additives in the form of hydrophobic rubber particles are provided. The first depiction A on the left shows that the aqueous solution exhibits two clearly distinguishable phases: a rubber particle phase and an aqueous phase. In the second description B to the right of the first description, hydrophobic rubber particles have been mixed directly in an aqueous solution containing 0.04% of TergitolMinFoam. In clear contrast to the first solution without surfactant, a single phase was observed, indicating a good homogeneous dispersion of the polymer particles in the aqueous solution. The dispersion remained stable for more than 48 hours.

[0058] Thus, this example establishes that the addition of selected nonionic surfactants enables the f...

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Abstract

A cement slurry composition is described as having cement, water, and organic polymeric particles. The composition also includes non-ionic surfactants, which may contain ethoxylate groups or contain both ethoxylate groups and propyxlate groups in the hydrophilic part. The non-ionic surfactant acts to disperse the hydrophobic polymeric particles in the slurry and to reduce or prevent foaming. The cement slurry composition is prepared and then pumped into the subterranean well and placed in a zone of the subterranean well. Time is then allowed for the cement slurry composition to set into a solid mass in the zone.

Description

Background technique [0001] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0002] The present disclosure generally relates to compositions and methods for treating or completing a subterranean well having a borehole. More specifically, the present disclosure relates to cement slurry compositions for cementing subterranean wells, and in one alternative, methods for subterranean well completions and / or cementing subterranean wells having boreholes. The present disclosure also relates to methods of preparing grout compositions containing polymer particles as additives and / or reducing foam in such grout compositions. [0003] In a typical cementing operation, cement slurry is prepared at the surface and then pumped into the subterranean well, through the liner or casing, to fill the annular space between the casing and the borehole wall. Once the slurry has set, the cement provides severa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/02
CPCC04B28/02C09K8/467Y02W30/91C04B18/22C04B2103/406C04B2103/408C04B2103/50C04B24/32
Inventor C·卡雷利J·C·李S·A·阿里
Owner PRAD RES & DEV LTD