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Low-temperature early-strength toughening cement slurry and method for preparing same

A low-temperature early strength agent and cement slurry technology, applied in the field of cement slurry, can solve problems such as no successful experience, and achieve the effects of good stability, increased compressive strength and toughness, and low water loss

Active Publication Date: 2016-05-11
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the research on low-temperature cement slurry system is only applied to offshore surface cementing and onshore shallow high-permeability wells that do not need fracturing. When the strength development is required, it still needs to have a certain toughness. During the fracturing process, the cement remains intact and does not affect the oil and gas production after fracturing. There is no domestic success in the research and application of low-temperature cement slurry systems that can meet the needs of fracturing. Experience can be referred to

Method used

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  • Low-temperature early-strength toughening cement slurry and method for preparing same
  • Low-temperature early-strength toughening cement slurry and method for preparing same
  • Low-temperature early-strength toughening cement slurry and method for preparing same

Examples

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Effect test

Embodiment 1

[0031] Weigh 100 parts by weight of high-resistance oil well cement, 1.8 parts by weight of low-temperature early-strength agent, 1.8 parts by weight of cementing agent, 0.8 parts by weight of drag reducer, and 2 parts by weight of low-temperature toughening agent, and dry mix it into a solid mixture; Take 44 parts by weight of water, 0.8 parts by weight of fluid loss reducer, and 0.2 parts by weight of defoamer and mix them into a solution in the stirring blade cup; pour the solid mixture into the stirring blade within 15 seconds at the speed of 4000±200r / min In the cup, stir at 12000 ± 500r / min at a high speed for 35s to prepare the low-temperature early-strength toughening cement slurry of the present invention. get as figure 1 The thickening curve shown.

Embodiment 2

[0033] Weigh 100 parts by weight of high-resistance oil well cement, 1.5 parts by weight of low-temperature early strength agent, 1.8 parts by weight of cementing agent, 0.8 parts by weight of drag reducer, and 2 parts by weight of low-temperature toughening agent, and dry mix it into a solid mixture; Take 44 parts by weight of water, 0.8 parts by weight of fluid loss reducer, and 0.2 parts by weight of defoamer and mix them into a solution in the stirring blade cup; pour the solid mixture into the stirring blade within 15 seconds at the speed of 4000±200r / min In the cup, stir at a speed of 12000±500r / min for 35s to prepare low-temperature early-strength toughening cement slurry. figure 2 The thickening curve shown.

Embodiment 3

[0035] Weigh 100 parts by weight of high-resistance oil well cement, 1.0 parts by weight of low-temperature early-strength agent, 1.8 parts by weight of cementing agent, 0.8 parts by weight of drag reducer, and 2 parts by weight of low-temperature toughening agent, and dry mix it into a solid mixture; Take 44 parts by weight of water, 0.8 parts by weight of fluid loss reducer, and 0.2 parts by weight of defoamer and mix them into a solution in the stirring blade cup; pour the solid mixture into the stirring blade within 15 seconds at the speed of 4000±200r / min In the cup, stir at a speed of 12000±500r / min for 35s at high speed to prepare low-temperature early-strength toughening cement slurry. image 3 The thickening curve shown.

[0036] The low-temperature early-strength cement slurry system of the present invention has good stability, low water loss, and can significantly increase the compressive strength and toughness of cement stones at low temperatures, such as Figure ...

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Abstract

The invention discloses low-temperature early-strength toughening cement slurry and a method for preparing the same, relates to cement slurry used during well cementing and belongs to the technical field of oil and gas well cementing engineering. By the aid of the low-temperature early-strength toughening cement slurry and the method, inherent shortcomings of slow strength development and high brittleness of cement stone at low temperatures can be solved. The low-temperature early-strength toughening cement slurry comprises, by weight, 100 parts of oil well cement, 1-2 parts of low-temperature early-strength agents, 1-2 parts of cementing agents, 1-4 parts of low-temperature toughening agents, 0.8-1.2 parts of PVA (polyvinyl acetate) fluid loss agents, 0.8 part of acetone formaldehyde condensation compound drag reducing agents, 0.2 part of defoamers and the balance clear water. A mass ratio of the clear water to the oil well cement is 0.44:1, and the density of the cement slurry is 1.85g / cm<3>-1.90g / cm<3>. The low-temperature early-strength toughening cement slurry and the method have the advantages that the low-temperature early-strength toughening cement slurry is excellent in stability and low in fluid loss characteristics, and the compressive strength and the toughness of cement stone at low temperatures can be obviously improved.

Description

technical field [0001] The invention relates to cement slurry used in well cementing, and belongs to the technical field of oil and gas well cementing engineering. Background technique [0002] The cement slurry in well cementing is used to seal the annular space between the casing and the formation, which plays the role of isolating oil, gas, water layers and supporting the casing. High-intensity pressure single or multiple impacts. At low temperature (20°C-25°C), the hydration of oil well cement is extremely slow, and the strength of cement stone at low temperature, especially the early strength, has always been a problem that plagues people. For low-permeability oil and gas reservoirs and horizontal well cementing, cement slurry is required to have excellent performance. stability, preventing the filtrate from polluting the reservoir, forming a high-edge water belt, and becoming a channel for oil, gas and water channeling. At the same time, large-scale fracture network ...

Claims

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Application Information

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IPC IPC(8): C09K8/467C04B28/00
CPCC04B28/00C09K8/467C04B24/12C04B22/06C04B24/28C04B24/30
Inventor 王香增于小龙申峰王涛王红娟杨先伦杨全枝刘云
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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