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A kind of low-viscosity flexible cement slurry for slim hole single channel cementing

A single-hole, viscous-flexible technology, which is applied in the field of cementing cement slurry to achieve the effects of low water loss, improved anti-channeling ability, and improved anti-corrosion effect.

Active Publication Date: 2016-10-26
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These series of problems have challenged the cement slurry system of slim hole cementing

Method used

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  • A kind of low-viscosity flexible cement slurry for slim hole single channel cementing
  • A kind of low-viscosity flexible cement slurry for slim hole single channel cementing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1, low-viscosity flexible cement slurry

[0061] Cement slurry formula: D grade oil well cement + 37.5% fresh water + 6.25% pore proppant + 3.75% fluid loss reducer (acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, relative molecular weight is 1 million to 200 Ten thousand) + 0.625% anti-foaming and defoaming agent + 1.25% elastic emulsion (styrene-butadiene latex, the effective content of which is 50%) + 1.5% dispersant + 0.125% retarder (citric acid) + 0.5% expansion agent (sodium oxide), the percentage of each of the above components refers to the percentage of cement weight.

[0062] The density of the low-viscosity flexible cement slurry prepared in this embodiment is 1.90g / cm 3 .

Embodiment 2

[0063] Embodiment 2, low-viscosity flexible cement slurry

[0064] Cement slurry formula: D-grade oil well cement + 56% fresh water + 12% reinforcing agent (composed of ultra-fine slag with a particle size of 15 μm and microsilica fume with a particle size of 5 μm) + 6% pore proppant + 10% floating beads+ 5% fluid loss reducer (acrylamide-2-acrylamide-2-methylpropanesulfonic acid copolymer, relative molecular weight is 1.5 million to 2 million) + 1% antifoaming and defoaming agent + 2% elastic emulsion (butadiene styrene Latex, wherein the effective content of styrene-butadiene latex is 55%) + 0.5% dispersant (magnesium oxide), the percentage of the above components refers to the percentage of cement weight.

[0065] The density of the low-viscosity flexible cement slurry prepared in this embodiment is 1.50g / cm 3 .

Embodiment 3

[0066] Embodiment 3, low-viscosity flexible cement slurry

[0067] Cement slurry formula: D-grade oil well cement + 41.3% fresh water + 8.3% pore proppant + 5% fluid loss reducer (N,N-dimethylacrylamide) + 0.83% anti-foaming and defoaming agent + 1.7% elastic emulsion ( Styrene-butadiene latex, wherein the effective content of styrene-butadiene latex is 55%) + 2% dispersant (sodium oxide) + 1.13% retarder (boric acid) + 35% silica fume, the percentage of the above components refers to the weight of cement percentage.

[0068] The density of the low-viscosity flexible cement slurry prepared in this embodiment is 1.90g / cm 3 .

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Abstract

The invention discloses a low-viscidity flexible cement paste for well cementation with a slim hole and a single channel. The low-viscidity flexible cement paste for well cementation comprises the following components in parts by weight: 100 parts of cement, 37.0-56.0 parts of water, 3.5-5.0 parts of filtrate reducer, 1.0-2.0 parts of elastic emulsion, 0.5-2.0 parts of dispersing agent, 6.0-9.0 parts of pore proppant and 0.5-1.0 part of foam inhibiting and defoaming agent. The cement paste in the invention has the characteristics of relatively low dehydration property and relatively high stability, adjustable thickening time, short gelling strength development time and good invading and pollution resistance. The set cement permeability of the cement paste in the invention after solidification is reduced effectively, and excellent anti-corrosion and anti-fluid-channeling effects can be achieved. The preservative effect of the cement in the invention is improved by over 80 times compared with that of common set cement, the wall surface shearing effect is improved by over 30%, and the anti-fluid-channeling property is improved by over 40%.

Description

technical field [0001] The invention relates to a cementing cement slurry in the field of petroleum cementing engineering, in particular to a low-viscosity flexible cement slurry for slimhole single-channel cementing. Background technique [0002] In the middle and late stages of oilfield development, it is becoming more and more difficult to exploit undeveloped reserves. If the conventional drilling and completion mode is used for mining, the investment is high, the risk is high, and the economic benefit is not high. In addition, for some marginal oil fields and those blocks with low single well production, it is not suitable to adopt the conventional drilling and completion mode. Slim-hole single-channel well combines slim-hole drilling technology with single-channel well technology, adopts small hole size, simplified wellbore structure design and production string design, and the completion operation does not take up rig time, which can minimize Drilling and completion c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/473C09K8/493
CPCC04B28/00C09K8/487C09K8/493C04B2111/00724
Inventor 耿亚楠许明标刘书杰周建良王晓亮金勇朱磊
Owner CHINA NAT OFFSHORE OIL CORP
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