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Fluid loss additive for oil well cement as well as preparation method and application of agent

A technology of fluid loss reducer and oil well cement, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of delayed cement slurry thickening time, excessive cement slurry retardation, thickening time upside down thickening time, etc. problem, to achieve the effect of good thickening line shape, moderate compressive strength and low initial consistency

Active Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The use of monomers rich in carboxyl, amino and other adsorption groups in the monomer combination, such as acrylic acid and dicarboxylic acid, has a significant effect on enhancing the fluid loss control agent, but the introduction of excess adsorption groups will delay The thickening time of cement slurry may even cause super-retarding phenomenon, which affects the normal use of the product and interferes with the cementing design
[0007] (2) The monomer combination contains a large proportion of acrylamide, and its amide group will be hydrolyzed when the temperature is higher than 70°C, which will easily lead to excessive retardation of cement slurry, and even the phenomenon of "upside down" thickening time (referring to the same cement slurry formula The higher the temperature, the longer the thickening time of the cement slurry), which cannot meet the requirements of long-sealing section cementing operations
[0008] (3) Existing oil well cement fluid loss reducers are difficult to meet the needs of low-density cementing operations
[0009] At present, fluid loss control agents for well cementing generally have problems such as poor temperature resistance, salt resistance, and poor compatibility with other admixtures. Higher requirements for salt resistance
AMPS copolymer cementing fluid loss control agent is a new generation of fluid loss control agent developed in recent years, which has a good effect of reducing water loss, but this kind of fluid loss control Difficult to meet the needs of cementing, especially long-sealing section cementing operations, or medium and low temperature cementing, especially low-density cementing and other special operation requirements

Method used

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  • Fluid loss additive for oil well cement as well as preparation method and application of agent
  • Fluid loss additive for oil well cement as well as preparation method and application of agent
  • Fluid loss additive for oil well cement as well as preparation method and application of agent

Examples

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Effect test

Embodiment 1

[0030] Embodiment 1 Preparation of oil well cement fluid loss reducer of the present invention

[0031]Add 400kg of distilled water to the reaction kettle, and add 62.4kg of weighed 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 18.7kg of itaconic acid (IA) to the kettle in turn under stirring conditions. , adjust the pH value of the solution in the kettle to 6.5 with 20% sodium hydroxide solution, then add accurately metered monomer components 26.8kg N-vinylpyrrolidone (NVP) and 24.9kg N, N-dimethylacrylamide to the kettle (DMAM), the temperature of the solution in the kettle is kept below 50°C during this process, and after stirring evenly, the pH value of the mixed solution in the kettle is adjusted to 7.5. Then, the temperature was raised until the temperature of the solution in the kettle rose to 55°C, and after 60 minutes of passing nitrogen gas, 26.5L of ammonium persulfate solution (50g / L) and 26.5L of sodium bisulfite solution (50g / L) were simultaneously added to t...

Embodiment 2

[0032] Embodiment 2 Preparation of oil well cement fluid loss reducer of the present invention

[0033] Add 400kg of distilled water to the reaction kettle, and add 89.3kg of weighed 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 8.9kg of itaconic acid (IA) to the kettle under stirring conditions , adjust the pH value of the solution in the kettle to 5.0 with 20% sodium hydroxide solution, and keep the temperature of the solution in the kettle below 50°C. Then add accurately metered monomer components 24.1kgN-vinylpyrrolidone (NVP) and 13.4kgN, N-dimethylacrylamide (DMAM) into the kettle, the solution temperature in the kettle is kept below 50°C during this process, stir After uniformity, the pH value of the mixture in the kettle was adjusted to 6.0. Then, the temperature was raised until the temperature of the solution in the kettle rose to 50°C, and after passing nitrogen gas for 30 minutes, 13.3L ammonium persulfate solution (50g / L) and 13.3L sodium bisulfite solution (...

Embodiment 3

[0034] Example 3 Evaluation of fluid loss reducing performance of oil well cement fluid loss reducer product A1 of the present invention

[0035] According to the cement slurry formula (G grade cement + 35% silica fume + (1 ~ 8.0)% A1 + 44% tap water, calculated according to the weight percentage of cement) to test the water loss of fresh water cement slurry and saturated NaCl brine cement slurry, the test method is in accordance with GB / T 19139-2003 "Oil Well Cement Test", the measurement conditions are in accordance with the China Petroleum and Natural Gas Industry Standard SY / T 5504.2-2005 "Evaluation Method for Oil Well Cement Additives Part 2: Fluid Loss Control Agent" to test API loss at 120 °C The amount of water, the experimental results are shown in Table 1 below.

[0036] The dehydration performance of the product A1 of table 1 embodiment 1

[0037]

[0038] From the experimental results in Table 1, it can be seen that the water loss of freshwater cement slurry ...

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Abstract

The invention relates to a fluid loss additive in the field of oil and gas well cementation and oilfield chemical auxiliaries, in particular to a fluid loss additive for oil well cement as well as a preparation method and an application of the agent. The fluid loss additive for the oil well cement is prepared from components in parts by weight as follows: 100 parts of 2-acrylamido-2-methylpropane sulfonic acid, 25-45 parts of N-vinylpyrrolidone, 8-45 parts of N,N-dimethylacrylamide and 8-33 parts of itaconic acid. The preparation method of the fluid loss additive for the oil well cement is an aqueous solution polymerization method. The fluid loss additive can be applied to well cementation operation at 30-200 DEG C, has no setting retarding effect on cement slurry and can meet high-temperature, ultra-high-temperature and low-temperature low-density well cementation operation requirements particularly.

Description

technical field [0001] The invention relates to a fluid loss reducer in the fields of oil and gas well cementing and oilfield chemical additives, and more particularly relates to a fluid loss reducer for oil well cement and its preparation method and application. Background technique [0002] At present, oil well cement fluid loss reducers commonly used in oil fields mainly include cellulose and its modified products, polyvinyl alcohol and its modified products. The above two types have basically no salt resistance and limited temperature resistance. They are mainly used in 110 Cementing operation below ℃. The third category is a multi-polymer product with 2-acrylamido-2-methylpropanesulfonic acid (AMPS) as the main monomer. This type of fluid loss control agent has stronger resistance to temperature and salt, with a maximum temperature resistance of 180 ℃, resistant to saturated salt water. [0003] The Chinese patent application number 200810051338.4 discloses a multi-po...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F226/10C08F220/54C08F222/02C09K8/035C04B24/16C04B24/12C04B24/04
Inventor 朱兵聂育志邱在磊陈红壮马鹏王浩任李洁
Owner CHINA PETROLEUM & CHEM CORP
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