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Foam cement slurry system and composition

A cement slurry and foam technology, applied in the field of chemical nitrogen-filled foam cement cementing, can solve the problems of uneven pore structure of foamed cement stone, poor foam stability, poor biodegradability, etc., and achieves adjustable density and thickening time. The effect of good foaming and foam stabilization and fast dissolving speed

Active Publication Date: 2016-01-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sodium alkyl sulfonate is easy to foam but difficult to stabilize the foam, and the foam stability is poor, so that it is impossible to prepare foam cement slurry with lower density, and the prepared foam cement stone has uneven pore structure, high permeability and resistance. low compressive strength
In addition, sodium alkylsulfonate and sodium alkylbenzenesulfonate foam stabilizers have poor biodegradability and will cause serious pollution to the environment

Method used

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  • Foam cement slurry system and composition
  • Foam cement slurry system and composition
  • Foam cement slurry system and composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: foam cement slurry density test

[0019] High sulfur-resistant G grade oil well cement was used to prepare foam cement slurry according to the standard API10B-4-2004. The basic composition of slurry dry ash is: high sulfur-resistant G oil well cement, air-generating agent I, fluid loss reducer (solid), dispersant, early strength agent; the basic composition of slurry mixing liquid is: air-generating agent II, foam stabilizer , fluid loss reducer (liquid), retarder and water; in this experiment, the solid dry ash component and the liquid component of the slurry were first weighed and mixed, and then according to the standard API10B-4-2004 During the preparation of cement slurry, during the stirring process, the air-generating agent Ⅰ in the solid dry ash component and the air-generating agent Ⅱ in the liquid component contact in the cement slurry to produce nitrogen gas, which realizes the purpose of filling the cement slurry with nitrogen gas. Under the f...

Embodiment 2

[0022] Embodiment 2: Simulation of foam cement slurry density change test under certain temperature / pressure conditions

[0023] Using high sulfur-resistant G-grade oil well cement, prepare foamed cement slurry according to standard API10B-4-2004, test the density of the cement slurry at room temperature 20 ° C / standard atmospheric pressure, and then pour the cement slurry into a diameter of 8 cm and a height of 10 cm In the circular pressure-resistant steel mold, the inside of the circular pressure-resistant steel mold is coated with polytetrafluoroethylene, the lower part is sealed with a threaded cover, and there is a small hole (0.5cm in diameter) in the middle of the upper sealed threaded cover for pressure transmission. Then put the circular pressure-resistant steel mold filled with foam cement slurry into the high-temperature and high-pressure curing kettle, use water as the heat transfer and pressure transfer medium to heat and pressurize the curing, take out the ceme...

Embodiment 3

[0026] Embodiment 3: the performance of foam cement slurry

[0027] High sulfur-resistant grade G oil well cement was used to prepare foamed cement slurry according to the standard API10B-4-2004 and the performance of foamed cement slurry was measured. The test results are shown in Table 3.

[0028] Table 3 Performance parameters of foam cement slurry

[0029]

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Abstract

The invention provides a novel chemical nitrogen-charge foam cement slurry, mainly solves the problems that the density is high and the stability is poor in a conventional chemical nitrogen-charge foam cement slurry, and is applicable to the field of oil and gas well cementing. The novel chemical nitrogen-charge foam cement slurry system comprises the components in parts by weight as follows: 100 parts of oil well cement, 0.5-2.0 parts of a foaming agent I, 0.5-2.0 parts of a foaming agent II, 0.7-2.5 parts of a foam stabilizing agent, 1.0-10 parts of a fluid loss agent, 1.0-1.5 parts of powder, 0.3-1.0 part of a retarder, 1.0-4.0 parts of an early strength agent and 48-70 parts of water. The density of the chemical nitrogen-charge foam cement slurry can be adjusted in a range of 0.80-1.50 g / cm <3>, the slurry is applicable to oil and gas well cementing operations in a range of 10-95 GEG C and has the advantages of simple site operation and foam cement cost reduction, the problems of low pressure leakiness and formation cementing leakage can be effectively solved, pollution of the cement slurry to an oil and gas production layer is reduced, and the application prospect is wide.

Description

technical field [0001] The invention relates to a chemical nitrogen-filled foam cement cementing technology, in particular to a novel chemical nitrogen-filled foam cement slurry system and its composition. Specifically, the present invention directly generates nitrogen in the cement slurry through a chemical method to prepare foam low-density cement slurry with stable performance. Background technique [0002] Foamed cement slurry is to fill the cement slurry with gas and improve the foam stability with surfactants or polymer substances, so as to prepare a stable and uniform low-density three-phase viscous fluid with low density and low permeability. Rate, low water loss, low thermal conductivity, compressibility, unique rheological properties, appropriate thixotropy and high strength, etc., can effectively solve the problems of low-pressure leaky formations, fractured formations, high permeability formations and cave formations. Well leakage, as well as solving the problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/473
CPCC04B28/00C04B38/02C04B2103/22C04B2103/408C04B2103/42C04B2103/465C04B2103/48C09K8/467C09K8/473C09K8/487
Inventor 王成文王瑞和周卫东张慧
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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