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
CN104059623AInactive Publication Date: 2014-09-24CNPC BOHAI DRILLING ENG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CNPC BOHAI DRILLING ENG
Publication Date
2014-09-24
Estimated Expiration
Not applicable · inactive patent

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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.
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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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