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Well cementation spacer fluid composition, well cementation spacer fluid as well as preparation method and application of well cementation spacer fluid

A technology of spacer fluid and composition, which is applied in the field of oil and gas well cementing, can solve problems such as holding pumps, changes in rheological properties of spacer fluid, and aggravated material settlement, so as to reduce the risk of pressure, good flushing effect, and sufficient cleaning environment. empty effect

Active Publication Date: 2022-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current cementing spacer fluid for oil-based drilling fluid can be maturely applied under the condition of medium and low temperature (120°C). The stabilizer material will fail, causing obvious settlement of the spacer fluid and changing the rheological properties of the originally designed spacer fluid. Not only can it not play the role of isolation and efficient flushing during cementing construction, but due to the serious settlement of the aggravated material, It may even lead to accidents such as annular clogging, pump holding, and formation leaking, which will eventually lead to failure of cementing construction

Method used

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  • Well cementation spacer fluid composition, well cementation spacer fluid as well as preparation method and application of well cementation spacer fluid
  • Well cementation spacer fluid composition, well cementation spacer fluid as well as preparation method and application of well cementation spacer fluid
  • Well cementation spacer fluid composition, well cementation spacer fluid as well as preparation method and application of well cementation spacer fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] raw material:

[0069] (1) High temperature resistant suspending agent: 75 parts by mass of OCMA type sodium bentonite and 25 parts by mass of AMPS (2-acrylamide-2-methylpropanesulfonic acid) multi-polymer, wherein the preparation method of the AMPS multi-polymer for:

[0070] 40 to 80 parts by mass of 2-acrylamido-2-methylpropanesulfonic acid, 1 to 30 parts by mass of 3-allyloxy-2-hydroxyl-1-propanesulfonic acid, 30 to 70 parts by mass of N'N-dimethylacrylamide, 1 to 20 parts by mass of acrylic acid, 1 to 20 parts by mass of acrylonitrile are added to 100 parts by mass of water, stirred to dissolve, and then the pH of the solution is adjusted to 6 to 7, followed by an inert Under the atmosphere, keep at 60 to 75°C for 1 to 1.5 hours; then add the initiator under stirring, continue to react at 60 to 75°C under stirring, and cool to room temperature (for example, naturally cool to 25±5°C), Obtain the anti-high temperature fluid loss reducing agent; wherein the initiato...

Embodiment 2

[0082] raw material:

[0083] (1) high temperature resistant suspending agent: same as embodiment 1.

[0084] (2) anti-high temperature stabilizer: with embodiment 1.

[0085] (3) Crosslinking agent: Example 1.

[0086] (4) surfactant: with embodiment 1.

[0087] (5) Dispersant: with embodiment 1.

[0088] (6) defoamer: with embodiment 1.

[0089] (7) weighting agent: with embodiment 1.

[0090] Preparation:

[0091] (1) Add 4 parts by mass of high temperature resistant suspending agent, 3 parts by mass of high temperature resistant stabilizer, 2 parts by mass of crosslinking agent, 0.8 parts by mass of dispersant, and 1 part by mass of defoamer to 100 parts of water, mix uniformly, and obtain large sample water; and add 10 parts by mass of surfactant into the large sample water and mix evenly to obtain the isolation liquid base liquid, which can be used in construction.

[0092] (2) Add 150 parts by mass of the weighting agent into the base liquid of the spacer fluid, ...

Embodiment 3

[0095] raw material:

[0096] (1) high temperature resistant suspending agent: same as embodiment 1.

[0097] (2) anti-high temperature stabilizer: with embodiment 1.

[0098] (3) Crosslinking agent: Example 1.

[0099] (4) surfactant: with embodiment 1.

[0100] (5) Dispersant: with embodiment 1.

[0101] (6) defoamer: with embodiment 1.

[0102] (7) weighting agent: with embodiment 1.

[0103] Preparation:

[0104] (1) 5 parts by mass of high temperature suspending agent, 3 parts by mass of high temperature resistant stabilizer, 3 parts by mass of crosslinking agent, 1 part by mass of dispersant and 1 part by mass of defoamer are added to 100 parts of water, mixed uniformly to obtain large sample water; and add 10 parts by mass of surfactant into the large sample water and mix evenly to obtain the isolation liquid base liquid, which can be used in construction.

[0105] (2) Add 200 parts by mass of the weighting agent into the base fluid of the spacer fluid, and stir ...

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Abstract

The invention relates to a well cementation spacer fluid composition, a well cementation spacer fluid and a preparation method and application thereof. The invention provides a well cementation spacer fluid composition and well cementation spacer fluid of the well cementation spacer fluid composition. The well cementation spacer fluid composition comprises the following components in percentage by mass: 3 to 5 percent of high-temperature-resistant suspending agent, 3 to 5 percent of high-temperature-resistant stabilizer, 1 to 3 percent of cross-linking agent, 10 to 13 percent of surfactant, 1 to 3 percent of weighting agent and the balance of water. The content of the weighting agent is 100 to 200 percent. When the spacer fluid is used for well cementation construction in a high-temperature environment of a deep well and an ultra-deep well, the spacer fluid can keep good fluidity, suspension property and stability, the risk of pump suffocation and stratum leakage suffocation is greatly reduced, an annulus can be efficiently flushed, effective cementation of a well cementation cement sheath, the stratum and a casing pipe is guaranteed, and the well cementation effect is improved. And a good foundation is laid for subsequent fracturing construction.

Description

technical field [0001] The invention relates to the field of oil and gas well cementing, in particular to a cementing spacer fluid composition, a cementing spacer fluid comprising the cementing spacer fluid composition, a preparation method and application thereof. Background technique [0002] In the cementing construction of deep wells, ultra-deep wells and horizontal wells with long sealing sections, due to the large well depth, the bottom hole temperature is high. The fluids used in drilling engineering are all high temperature resistant systems. In order to solve the mutual contact pollution between cement slurry and drilling fluid during deep high-temperature cementing construction, and effectively flush the casing and formation annulus, achieve the purpose of effectively sealing the annulus. It is necessary to prepare a suitable spacer fluid system to effectively isolate the cement slurry from the drilling fluid, and to efficiently flush the oil-based drilling fluid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/40C08F220/58C08F220/38C08F220/54C08F220/06C08F220/46
CPCC09K8/40C08F220/585C08F220/382C08F220/54C08F220/06C08F220/46
Inventor 陶谦杜晓雨陆沛青刘奎刘仍光杜金龙
Owner CHINA PETROLEUM & CHEM CORP