High-temperature-resistant salt-resistant fluid loss agent and preparation method thereof

A water loss reducing agent and high temperature resistant technology, applied in the field of oil drilling, can solve the problems of poor stability of cement slurry and easy delamination

Inactive Publication Date: 2014-09-24
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use temperature of the fluid loss reducer can only reach 150°C, and the stability of the cement slurry system is poor under high temperature conditions, and stratification is prone to occur

Method used

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  • High-temperature-resistant salt-resistant fluid loss agent and preparation method thereof
  • High-temperature-resistant salt-resistant fluid loss agent and preparation method thereof
  • High-temperature-resistant salt-resistant fluid loss agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take by weight the following 5 components:

[0020]

[0021] Dissolve the above 5 monomers in 400 parts of water; use sodium hydroxide solution to adjust the pH value of the solution to 2; add the solution to the three-necked flask, 40 ℃ constant temperature water bath, and stir, when the solution temperature in the three-necked flask reaches After 40°C, add 1 part of ammonium persulfate initiator, continue the reaction for 6 hours, dry and pulverize to obtain the product.

Embodiment 2

[0023] Take by weight the following 5 components:

[0024]

[0025] Dissolve the above 5 monomers in 566 parts of water; use sodium hydroxide solution to adjust the pH value of the solution to 4; add the solution to the three-necked flask, 50 ° C constant temperature water bath, and stir, when the temperature of the solution in the three-necked flask reaches After 50°C, add 0.5 parts of ammonium persulfate initiator, continue the reaction for 4 hours, dry and pulverize to obtain the product.

Embodiment 3

[0027] Take by weight the following 5 components:

[0028]

[0029] Dissolve the above-mentioned 5 monomers in 900 parts of water; adjust the pH value of the solution to 5 with sodium hydroxide solution; add the solution into the three-necked flask, put it in a constant temperature water bath at 60°C, and stir it. When the temperature of the solution in the three-necked flask reaches After 60°C, add 0.1 part of ammonium persulfate initiator, continue the reaction for 2 hours, dry and pulverize to obtain the product.

[0030] 2. Performance evaluation of fluid loss reducer:

[0031] The cement slurry was prepared according to GB / T19139-2003 and its properties such as water loss, thickening time and compressive strength were measured. The specific cement paste formula is as follows:

[0032] The formula of table 16 kinds of cement slurry systems

[0033]

Recipe 1

Recipe 2

Recipe 3

Recipe 4

Recipe 5

Recipe 6

G grade oil well cement

...

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Abstract

The invention discloses a high-temperature-resistant salt-resistant fluid loss agent which is prepared by polymerizing the following components in parts by weight: 40-60 parts of 2-acrylamido-2-methylpropanesulfonic acid, 10-40 parts of acrylamide, 10-40 parts of alkyl substituted acrylamide or N-vinyl-2-pyrrolidone, 5-30 parts of unsaturated carboxylic acid and 5-20 parts of sodium p-styrenesulfonate, and an initiator which accounts for 0.1-1.0 wt% of the five components above. The invention also provides a preparation method of the fluid loss agent. The fluid loss agent has better high temperature resistance, and the maximum normal use temperature can reach 200 DEG C. The fluid loss agent has higher salt resistance, and can resist a saturated NaCl solution. The cement mortar with the fluid loss agent has the advantages of high system stability and high compression strength, and does not have the phenomenon of longer thickening time along with the temperature increase.

Description

Technical field: [0001] The invention relates to the field of petroleum drilling, in particular to a high-temperature-resistant, salt-resistant fluid loss reducing agent and a preparation method thereof. Background technique: [0002] At present, fluid loss reducers commonly used in oil well cementing operations include polyvinyl alcohol, cellulose, and 2-acrylamido-dimethylpropanesulfonic acid (AMPS). Polyvinyl alcohol fluid loss reducers have the advantages of low price, simple preparation process, and no retarding effect at low temperatures. However, this type of fluid loss reducer has poor salt and high temperature resistance. Not more than 5% (NaCl concentration). Cellulosic fluid loss reducers are rich in sources and low in price, and are widely used in the petroleum industry. However, the disadvantages of this type of fluid loss reducer are poor water solubility, high viscosity, delayed cement stone strength development, and the maximum use temperature does not excee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/487C08F220/58C08F220/56C08F220/54C08F226/10C08F220/06C08F222/02C08F212/14
CPCC08F220/58C08F220/585C09K8/487C08F220/56C08F220/54C08F222/02C08F212/14C08F226/10C08F220/06
Inventor 刘文明孙勤亮付家文齐奔胡星彤
Owner CNPC BOHAI DRILLING ENG
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