Lipophilic cement paste capable of improving packing performance of oil-containing well cementation interfaces

A cement slurry, lipophilic technology, applied in drilling composition, sulfate preparation, organic chemistry, etc., can solve the problems of cement slurry not having lipophilicity, reduce pre-liquid dependence, etc., to improve interface bonding performance, The effect of reducing rigidity and improving compatibility

Active Publication Date: 2022-02-01
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of lipophilic cement slurry that can improve the sealing performance of oily cementing interface, which solves the problem that the existing cement slurry does not have lipophilicity. The good cementation of the interface between the first and second wells can also overcome the shortcomings of only using the pre-fluid to achieve the wetting reversal of the interface, greatly improve the sealing effect of the cement sheath under the condition of oil-based drilling fluid, and reduce the dependence on the performance of the pre-fluid

Method used

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  • Lipophilic cement paste capable of improving packing performance of oil-containing well cementation interfaces
  • Lipophilic cement paste capable of improving packing performance of oil-containing well cementation interfaces
  • Lipophilic cement paste capable of improving packing performance of oil-containing well cementation interfaces

Examples

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Embodiment 1

[0034] A kind of lipophilic cement slurry that can improve the sealing performance of oily cementing interface, the cement slurry contains the following components in parts by weight: 100 parts of oil well G grade cement, 44 parts of water, 4 parts of fluid loss reducer, 2 parts of retarder Coagulant, 1.7 parts of anionic-nonionic surfactant DBP (as surfactant 1), 1.3 parts of fatty alcohol polyoxyethylene ether (HLB=13, as surfactant 2), 0.02 parts of defoamer, 20 parts Nano silica, 10 parts of barite, 1 part of dispersant.

[0035] Wherein, the fluid loss reducer is a terpolymer of DMAA, AMPS, AM, wherein the molar ratio of DMAA, AMPS, AM is 7.5:0.8:1.7, and it is prepared as follows: weigh AMPS, DMAA and AM according to the aforementioned molar ratio A monomer is poured into a certain amount of deionized water to fully dissolve it, and the total monomer concentration is kept at 20% (mass percentage concentration), then poured into a three-necked flask and fed with nitrogen ...

Embodiment 2

[0040] A kind of lipophilic cement slurry that can improve the sealing performance of oily cementing interface, the cement slurry contains the following components in parts by weight: 100 parts of oil well G grade cement, 44 parts of water, 8 parts of fluid loss reducer, 2 parts of retardant Coagulant, 0.7 parts of anionic-nonionic surfactant DBP, 1.7 parts of fatty alcohol polyoxyethylene ether, 0.02 parts of defoamer, 20 parts of nano-silica, 10 parts of barite, 5 parts of iron ore powder, 1 part dispersant.

[0041] Among them, the fluid loss reducer is a terpolymer of DMAA, AMPS and AM.

[0042] Among them, the retarder is a terpolymer of AMPS, SSS, and AA.

[0043] Among them, the defoamer is obtained by physically mixing tributyl phosphate and higher stearic acid at a mass ratio of 1.5:0.7.

[0044] Among them, the dispersant is obtained by physically mixing formaldehyde and polystyrene sulfonate at a mass ratio of 1:2.

Embodiment 3

[0046] A kind of lipophilic cement slurry that can improve the sealing performance of oily cementing interface, the cement slurry contains the following components in parts by weight: 100 parts of oil well G grade cement, 44 parts of water, 8 parts of fluid loss reducer, 2 parts of retardant Coagulant, 1.7 parts of anionic-nonionic surfactant DBP, 0.5 parts of decyl glucoside, 0.02 parts of defoamer, 20 parts of nano-silica, 10 parts of iron ore powder, and 1 part of dispersant.

[0047] Among them, the fluid loss reducer is a terpolymer of DMAA, AMPS and AM.

[0048] Among them, the retarder is a terpolymer of AMPS, SSS, and AA.

[0049] Among them, the defoamer is obtained by physically mixing tributyl phosphate and higher stearic acid at a mass ratio of 1.5:0.7.

[0050] Among them, the dispersant is obtained by mixing formaldehyde and polystyrene sulfonate at a mass ratio of 1:2.

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Abstract

The invention discloses lipophilic cement paste capable of improving the packing performance of oil-containing well cementation interfaces. The cement paste comprises the following components in parts by weight: 100 parts of cement, 35-65 parts of water, 3-8 parts of a fluid loss agent, 2-5 parts of a retarder, 0.5-1.7 parts of an anionic-nonionic surfactant, 0.5-1.7 parts of an anionic or nonionic surfactant with an HLB value of 8-15, 0.02 part of a defoaming agent, 20-25 parts of a strength stabilizer, 10-80 parts of a density regulator and 1 part of a dispersing agent. The cement paste disclosed by the invention has oleophylic capacity, realizes good cementation of a cement sheath and an oil-containing well cementation interface I and an oil-containing well cementation interface II, can overcome the defect that wetting reversal of the interfaces is achieved only by using prepad fluid, greatly improves the packing effect of the cement sheath under the condition of oil-based drilling fluid, and reduces dependence on the performance of a prepad fluid.

Description

technical field [0001] The invention relates to a lipophilic cement slurry, in particular to a lipophilic cement slurry capable of improving the sealing performance of an oily cementing interface. Background technique [0002] In drilling engineering, cementing plays an important role. Whether the cement sheath can seal off the formation will affect the smooth progress of subsequent drilling operations, the well construction period and cost of oil and gas wells, and even affect the cost of the entire block. Exploration and development. In Chuanqing, Karamay and other places, drilling often encounters shale formations. Due to the strong water sensitivity of shale and the instability of well walls, oil-based drilling fluids have the characteristics of strong inhibition and good lubricity compared to water-based drilling fluids. , and is conducive to maintaining the stability of the shale wellbore, so oil-based drilling fluid is often used on site. However, oil-based drilling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C07C303/24C07C305/06C08F220/58C08F212/14C08F220/06C08F230/02
CPCC09K8/467C07C303/24C08F220/585C09K2208/10C07C305/06C08F212/30C08F220/06C08F230/02Y02W30/91
Inventor 黄盛周灿李早元刘健孙劲飞苏东华李进
Owner SOUTHWEST PETROLEUM UNIV
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