Oil field well cementation filtration-reducing agent and preparation method thereof

A fluid loss agent and cementing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor high temperature resistance, large dosage, low efficiency, etc., and achieve good fluidity and fast dissolution speed. , easy to use effect

Active Publication Date: 2014-07-30
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems existing in the application of the currently used oilfield cementing fluid loss reducing agent, to overcome the shortcomings of ordinary products such as large dosage, low efficiency and poor high temperature resistance, and to provide a good loss reducing Oilfield cementing water loss reducing agent that can better meet the requirements of oilfield cementing construction

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0019] The present invention is described in detail by the following examples, it is necessary to point out that the following examples are only used to further illustrate the present invention, and can not be interpreted as limiting the protection scope of the present invention, those skilled in the art can according to the above-mentioned SUMMARY OF THE INVENTION Some non-essential improvements and adjustments are made to the present invention.

[0020] Examples of prepared polymers are shown in the table below:

[0021] Numbering

[0022] Note: A is polyvinyl acetate (the value in brackets is the degree of polymerization, the same below)

[0023] B is the polymer obtained by modifying ethylene and vinyl acetate, wherein the ethylene addition is 5% of the vinyl acetate quality in Example 7, and the ethylene addition is 10% of the vinyl acetate quality in Example 3 and Implementation 8

[0024] C is the polymer obtained by modifying acrylamide and vinyl propionate...

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PUM

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Abstract

The invention relates to an oil field well cementation filtration-reducing agent and a preparation method thereof, which is characterized in that alcoholysis reaction is carried out on a copolymer raw material formed by polyvinyl acetate with certain degree of polymerization and at least one carboxylic vinyl ester polymer with another degree of polymerization in a certain weight ratio, and then drying and crushing are carried out to obtain the filtration-reducing agent. The filtration-reducing agent has the characteristics of uniformity, stability, good flowability and good dispersibility and has the advantages of good filtration reducing action and high safety, is convenient to use and is easy to control. The invention has simple process operation, and the production can be carried out only by using a simple production device; as the filtration-reducing agent, the product has good filtration reducing capacity. Moreover, the product has small influence on the thickening time, has high compression strength and certain high temperature resistance and can meet the well drilling and well cementation construction demands under different geological conditions.

Description

technical field [0001] The invention relates to a fluid loss reducer for oil field cementing, in particular to a polyhydric alcohol for oil field cementing fluid loss reducer and a manufacturing method thereof. Background technique [0002] In oilfield operations, cementing is required after each well is drilled. Cementing is to inject cement slurry into the annular space between the well wall and the casing to isolate underground oil, gas, and water layers and support the protective casing. the goal of. With the development of the petroleum industry, the number of medium-deep wells and horizontal wells has increased rapidly. The geological structure at the bottom of the well is complex and the downhole conditions are harsh. The phases will separate and cause the filtrate to lose water and seep into the formation. If the water loss of the cement slurry cannot be controlled, the density of the cement slurry will increase with the decrease of the liquid phase volume, the thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/487C08F116/06C08F216/06C08L29/04
Inventor 廖永康唐云庆吴永忠黎园
Owner CHINA PETROCHEMICAL CORP
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