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Modified fluid loss agent

A water loss reducing agent and modification technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of affecting early strength and thickening time, poor thixotropic performance, etc., and achieve the goal of promoting hydration release Heat rate, increased sedimentation stability, strong drag reduction effect

Inactive Publication Date: 2019-10-08
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the powder-type fluid loss reducers, polyamide copolymer fluid loss reducers are widely used, but they often affect the early strength and thickening time, and the thixotropic performance is not good. The fluid loss reducer of the present invention aims to Reduce the impact on thickening time and strength, improve the thixotropic properties of cement slurry, and improve cementing efficiency

Method used

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  • Modified fluid loss agent
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Embodiment 1

[0035] AMPS / AM copolymer 45%, bentonite 15%, superfine calcium carbonate 35%, aluminum sulfate 5%, test temperature 40 ℃, fluid loss reducing agent dosage 1.5%.

Embodiment 2

[0037] AMPS / AM copolymer 45%, bentonite 8%, superfine calcium carbonate 42%, aluminum sulfate 5%, test temperature 60 ℃, fluid loss reducing agent dosage 1.5%.

Embodiment 3

[0039] AMPS / AM copolymer 40%, bentonite 20%, superfine calcium carbonate 37%, aluminum sulfate 3%, test temperature 60 ℃, fluid loss reducing agent dosage 1.5%.

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Abstract

The invention discloses a modified fluid loss agent, and relates to the technical field of cement paste admixtures. The modified fluid loss agent is prepared from the following components in percentage by weight: 40-65% of a polyamide polymer, 0-20% of bentonite, 20-45% of super-fine calcium carbonate, and 5-10% of aluminum sulfate; and the polyamide polymer is a copolymer of 2-acrylamide-2-methylpropane sulfonate and acrylamide (AMPS / AM). By using the fluid loss agent, cement paste with low water loss, high strength, good anti-salt performance and rheological property, high static shear forceand good thixotropic property is easily prepared.

Description

technical field [0001] The invention relates to the technical field of cement slurry external admixtures, in particular to a fluid loss reducer used for reducing the water loss of cement slurry during oil and gas drilling and cementing, and more specifically to a modified fluid loss reducer. Background technique [0002] Water loss reducer is a very important admixture for cementing cement. During cementing construction, it can improve the structure of cement filter cake to form a dense filter cake with low permeability, thereby reducing water loss and ensuring the density and rheology of cement slurry. , thickening time, etc. meet the design requirements, and at the same time avoid the pollution and damage to the oil layer caused by the loss of water from the cement slurry. [0003] At present, there are two types of fluid loss reducers used in oilfields: water agent and powder agent. The amount of cement used is relatively large, and the cost is relatively high. After the ...

Claims

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Application Information

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IPC IPC(8): C09K8/467
CPCC09K8/467
Inventor 曾雪玲张洋勇古安林
Owner JIAHUA SPECIAL CEMENT
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