Early strength agent for cementation of oil wells in low-temperature mining area and preparation method thereof

A technology of oil well cementing and early strength agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of casing corrosion, cement slurry loss of fluidity, false setting, etc., and reduce the crystallization nucleation potential barrier, promote the hydration reaction rate of cement, and improve the effect of early strength

Active Publication Date: 2019-04-12
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the deepening of oil and gas field development, the development projects in high latitude and deep sea areas are increasing rapidly. The common problem is that the low temperature delays the cement hydration process, reduces the strength of cement cement, seriously affects the progress of cementing and completion, and even affects the development of oil wells.
[0003] Traditional inorganic early strength agents, such as calcium chloride, the conventional dosage (1-4%) of early strength performance at low temperature can not meet the requirements, too high dosage will lead to false coagulation, resulting in the loss of fluidity of cement slurry
In addition, chloride ions also have the adverse effect of casing corrosion

Method used

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  • Early strength agent for cementation of oil wells in low-temperature mining area and preparation method thereof
  • Early strength agent for cementation of oil wells in low-temperature mining area and preparation method thereof
  • Early strength agent for cementation of oil wells in low-temperature mining area and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take by weighing 38.25g of calcium chloride and 50.15g of water to configure calcium chloride aqueous solution, weigh 43.74g of potassium silicate and 44.26g of water to configure potassium silicate solution, weigh 13.28g of anionic dispersant, 11.53g of cationic dispersant and 158.2g of water is used to configure the aqueous solution of the composite dispersant. The composite dispersant solution was introduced into a three-necked flask, the temperature was set at 15°C, and the dispersant solution was stirred evenly. Under the condition of keeping stirring, the calcium chloride aqueous solution and the potassium silicate aqueous solution are added dropwise at the same time, and the dropping rate is adjusted so that the dropping time is controlled at about 1 hour. Continue stirring for 1 h after the dropwise addition, and then slowly cool down to room temperature to obtain the early strengthening agent HA-1.

Embodiment 2

[0037] Weigh 54.85g of calcium nitrate and 55.29g of water to configure calcium nitrate aqueous solution, weigh 53.74g of water glass and 44.26g of water to configure water glass solution, weigh 10.28g of anionic dispersant, 13.53g of cationic dispersant and 141.5g of water to configure Composite dispersant aqueous solution. The composite dispersant solution was introduced into a three-necked flask, the temperature was set at 15°C, and the dispersant solution was stirred evenly. Under the condition of keeping stirring, the calcium chloride aqueous solution and the potassium silicate aqueous solution are added dropwise at the same time, and the dropping rate is adjusted so that the dropping time is controlled at about 2 hours. Continue to stir for 4 hours after the dropwise addition, and then slowly cool down to room temperature to obtain the early strengthening agent HA-2.

Embodiment 3

[0039] Weigh 44.85g of calcium formate and 53.57g of water to configure calcium formate aqueous solution, weigh 48.36g of potassium metasilicate and 43.78g of water to configure potassium metasilicate solution, weigh 17.65g of anionic dispersant, 14.19g of cationic dispersant and 133.5g of water is used to configure the aqueous solution of the composite dispersant. The composite dispersant solution was introduced into a three-necked flask, the temperature was set at 15°C, and the dispersant solution was stirred evenly. Under the condition of keeping stirring, the calcium chloride aqueous solution and the potassium silicate aqueous solution are added dropwise at the same time, and the dropping rate is adjusted so that the dropping time is controlled at about 7 hours. Continue to stir for 3 hours after the dropwise addition, and then slowly cool down to room temperature to obtain the early strengthening agent HA-3.

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Abstract

The invention discloses an early strength agent for cementation of oil wells in a low-temperature mining area and a preparation method thereof. The early strength agent is prepared by reacting a water-soluble calcium solution with a water-soluble silicate solution in a composite dispersant solution containing a cationic dispersant and an anionic dispersant. The early strength agent can be widely applied to cementation of the oil wells with high latitude, deep water layers and the like in the low-temperature mining area, so that the solidification efficiency of cement slurry is improved, the cement stone strength of the oil wells is enhanced, and the cementation efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of oilfield cementing early-strength agents, and relates to an early-strength agent for oil well cementing in a low-temperature production area and a preparation method thereof. Background technique [0002] Well cementing is a construction operation in which casing is inserted into the well, and then cement slurry is injected into the annular space between the wellbore and the casing. The solidified cement slurry plays the role of sealing the formation and supporting the casing. With the deepening of oil and gas field development, the development projects in high latitude and deep sea areas are increasing rapidly. The common problem is that the low temperature delays the cement hydration process, reduces the strength of cement cement, seriously affects the progress of cementing and completion, and even affects the development of oil wells. . [0003] Traditional inorganic early strength accelerators, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/467C09K2208/10
Inventor 王伟山郭亚楠冯中军傅乐峰
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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