Cement mortar for long cementing segment and large temperature difference salt-gypsum bed well cementation, and preparation method thereof

A technology of large temperature difference and salt paste layer, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as potential safety hazards, poor performance of cement slurry, performance changes of cement slurry admixtures, etc., to achieve good gas channeling prevention Effect

Active Publication Date: 2016-01-27
ANTON OILFIELD SERVICES (GRP) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there is still little research on the cement slurry system for deep well cementing in thick salt-gypsum layers, and the above-mentioned problems also exist in the cementing technology of thick salt-gypsum layers. Under the action of brine sodium chloride in the thick salt paste layer, the performance of the cement slurry admixture will change or even fail, and the admixture will not be able to fully play its role in cementing, seriously affecting the performance of the cement slurry. It also affects the cementing quality and creates potential safety hazards
Therefore, the existing cement slurry is not suitable for the cementing technology of the salt-gypsum layer with large temperature difference, and it cannot better solve the problem of poor performance of the cement slurry in the salt-gypsum layer in the long sealing section.

Method used

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  • Cement mortar for long cementing segment and large temperature difference salt-gypsum bed well cementation, and preparation method thereof
  • Cement mortar for long cementing segment and large temperature difference salt-gypsum bed well cementation, and preparation method thereof
  • Cement mortar for long cementing segment and large temperature difference salt-gypsum bed well cementation, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 100 parts of oil well G grade cement, 8 parts of silica powder (purity ≥ 98%, particle size 0.1 μm-0.3 μm), 10 parts of hollow glass microspheres, 1 part of 2-acrylamido-2 methylpropane Sulfonic acid polymer, 0.5 part of aliphatic hydroxysulfonate condensate, 0.5 part of bentonite, 1 part of calcium oxide, 1 part of sulphate and 0.5 part of basalt fiber, mixing and stirring the above materials to obtain a dry blend material;

[0037] Weigh 0.5 parts of 2-acrylamido-2 methylpropanesulfonic acid polymer and 0.1 part of tributyl phosphate, and dissolve them uniformly in 77 parts of sodium chloride solution with a mass concentration of 18%, stir evenly, and prepare get wet mix materials;

[0038] Stir the above-mentioned wet-mixed material at a speed of 4000r / min, while stirring, add the above-mentioned dry-mixed material into the above-mentioned wet-mixed material at a uniform speed to obtain cement slurry for cementing salt-gypsum layers with large temperature diffe...

Embodiment 2

[0040] Weigh 100 parts of oil well G grade cement, 15 parts of silica powder (purity ≥ 98%, particle size 0.1 μm-0.3 μm), 20 parts of hollow glass microspheres, 4 parts of 2-acrylamido-2 methylpropane Sulfonic acid polymer, 2 parts of aliphatic hydroxysulfonate condensate, 2 parts of bentonite, 3 parts of calcium oxide, 3 parts of sulfate and 2 parts of basalt fiber, the above materials are mixed and stirred evenly to obtain a dry blend material;

[0041] Weigh 2 parts of 2-acrylamido-2 methylpropanesulfonic acid polymer and 0.3 part of tributyl phosphate, and dissolve them uniformly in 100 parts of sodium chloride solution with a mass concentration of 18%, stir evenly, and prepare get wet mix materials;

[0042] Stir the above-mentioned wet-mixed material at a speed of 4000r / min, and at the same time, add the above-mentioned dry-mixed material to the above-mentioned wet-mixed material at a uniform speed to obtain the cement slurry for cementing the salt-gypsum layer with larg...

Embodiment 3

[0044] Weigh 100 parts of oil well G grade cement, 10 parts of silica powder (purity ≥ 98%, particle size 0.1 μm-0.3 μm), 13 parts of hollow glass microspheres, 2 parts of 2-acrylamide-2-methylpropane Sulfonic acid polymer, 0.8 part of aliphatic hydroxysulfonate condensate, 0.9 part of bentonite, 1.5 part of calcium oxide, 1.6 part of sulfate and 0.8 part of basalt fiber, the above materials are mixed and stirred evenly to obtain a dry blend material;

[0045] Weigh 0.8 parts of 2-acrylamido-2 methylpropanesulfonic acid polymer and 0.15 parts of tributyl phosphate, and dissolve them uniformly in 83 parts of sodium chloride solution with a mass concentration of 18%, stir evenly, and prepare get wet mix materials;

[0046] Stir the above-mentioned wet-mixed material at a speed of 4000r / min, and at the same time, add the above-mentioned dry-mixed material to the above-mentioned wet-mixed material at a uniform speed to obtain the cement slurry for cementing the salt-gypsum layer w...

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Abstract

The invention discloses a cement mortar for long cementing segment and large temperature difference salt-gypsum bed well cementation, and a preparation method thereof, and relates to the field of well cementation engineering in order to solve the problem of poor comprehensive performances of cement mortars in long cementing segment and large temperature difference salt-gypsum beds. The cement mortar comprises 100 parts of oil well cement, 8-15 parts of a high temperature stabilizer, 10-20 parts of a lightening agent, 1-4 parts of a filtrate loss reduction agent, 0.5-2 parts of a dispersant, 0.5-2 parts of a suspension stabilizer, 1-3 parts of a gas channeling prevention agent, 1-3 parts of a strength adjusting agent, 0.5-2 parts of fibers, 77-100 parts of a sodium chloride solution with the mass concentration of 18%, 0.5-2 parts of a set retarder and 0.1-0.3 parts of an antifoaming agent. The cement mortar has the advantages of high temperature resistance, salt resistance and strong gas channeling prevention in the long cementing segment and large temperature difference salt-gypsum beds.

Description

technical field [0001] The invention relates to the field of oil field cementing engineering, in particular to a cement slurry for well cementing of a salt-gypsum layer with a large temperature difference in a long sealing section and a preparation method thereof. Background technique [0002] Well cementing is an indispensable and important link in the drilling process. The purpose is to strengthen the well wall, ensure continuous drilling, isolate oil, gas and water layers, and ensure the smooth progress of the entire mining operation during the exploration period. Insert the casing, and inject cement slurry into the annular space between the wellbore and the casing. The cement slurry then turns into cement stone to consolidate the casing and the well wall. The cement slurry not only fixes and protects the casing during the cementing operation It also plays the role of protecting high-pressure oil and gas layers and sealing off serious leakage layers and other complex bott...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C09K8/467
Inventor 卢成辉罗洪文杨清江张昊汤勇王洁李保东
Owner ANTON OILFIELD SERVICES (GRP) LTD
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