Storable water-silica suspensions and methods

Inactive Publication Date: 2003-09-25
HALLIBURTON ENERGY SERVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result of such strength retrogression, pressurized formation fluids can enter the well bore which is highly disadvantageous.
However, the water-silica suspensions used heretofore settle and separate over time, and as a result, agitating equipment during storage of the suspensions must be utilized to prevent such settling and the formation of hard cake in the bottoms of containers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0031] Silica flour was suspended in fresh water containing colloidal carbon black in an amount of 177% silica flour by weight of water in the resulting suspension. The colloidal carbon black suspending agent was present in the suspension in an amount of about 40% by weight of water in the resulting suspension. The suspension identified as Sample No. 1 was stored and monitored over a period of 6 weeks. That is, the sample was examined for free water, settling, whether it was gelled and whether it was re-stirrable to its original consistency after 3 days, after 1 week, after 3 weeks, and after 6 weeks. The results of these tests are given in the Table below.

[0032] In Sample No. 2, silica flour was suspended in fresh water containing prehydrated bentonite suspending agent in an amount to produce a suspension containing 150% silica flour by weight of water in the suspension. The bentonite suspending agent was present in the suspension in an amount of 5% by weight of water in the suspen...

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Abstract

Storable water-silica suspensions and methods of cementing well bores are provided. The storable water-silica suspensions are basically comprised of water, silica and an effective amount of a suspending agent selected from the group consisting of colloidal materials, clays and gel forming polymers.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to storable water-silica suspensions and methods of cementing wells.[0003] 2. Description of the Prior Art[0004] Hydraulic cement compositions are commonly utilized in subterranean well completion and remedial operations. For example, hydraulic cement compositions are used in primary cementing operations whereby strings of pipe such as casings and liners are cemented in well bores. In performing primary cementing, a hydraulic cement composition is pumped into the annular space between the walls of a well bore and the exterior surfaces of a pipe string disposed therein. The cement composition is permitted to set in the annular space thereby forming an annular sheath of hardened substantially impermeable cement therein. The cement sheath physically supports and positions the pipe string in the well bore and bonds the exterior surfaces of the pipe to the walls of the well bore whereby the undesirable migration of flui...

Claims

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Application Information

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IPC IPC(8): C04B14/06C04B40/00C09K8/46E21B33/13
CPCC04B14/062C04B40/0039C09K8/46E21B33/13C09K8/467C04B14/06C04B14/10C04B28/02C04B40/06C04B24/163C04B24/26C04B24/38C04B2103/40C04B20/0084
InventorVIJN, JAN PIETERDAO, BACH
OwnerHALLIBURTON ENERGY SERVICES INC