Novel cement paste for well cementation

A technology for oil well cement slurry and cement slurry, which is applied in the field of oil well cement slurry, can solve the problems of performance restriction, many types of cement slurry composition, difficulty in debugging the performance of cement slurry, etc.

Inactive Publication Date: 2011-11-23
TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

To make the cement slurry have multiple properties, the cement slurry composition needs to be mixed with multiple admixtures, and the required cement slurry performance is adjusted by testing the ratio of the admixtures, which results in many types of cement slurry composition. Complicated phenomenon, the admixtures are easy to interact with each other, and even the performance of each other

Method used

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  • Novel cement paste for well cementation
  • Novel cement paste for well cementation
  • Novel cement paste for well cementation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Water loss reduction performance test of cement slurry used for well cementing in this application

[0017] High sulfur-resistant G-grade oil well cement is used to prepare cement slurry according to the pulping method of oil well cement. The basic composition of the slurry is: oil well cement, tap water, latex powder (respectively natural rubber milk powder, styrene-butadiene latex powder, polyvinyl acetate) -vinyl latex powder, organic silica gel latex powder and polyacrylate latex powder), defoamer; in this experiment, the latex powder mentioned above is dry mixed in cement, then mixed with tap water to make cement slurry according to the API method, The latex powder mentioned above can also be uniformly dispersed in tap water, and then mixed with cement to make cement slurry according to the API method. These two mixing methods have no effect on the performance of cement slurry. The prepared cement slurry was placed in an atmospheric thickener and stirred...

Embodiment 2

[0020] Embodiment 2: the anti-channeling performance test of the cement slurry of the present application

[0021] The anti-channeling performance of oil well cement slurry can use ultrasonic static gel strength tester to evaluate the development time of cement slurry structural strength from 48Pa to 240Pa. The shorter the time, the stronger the anti-channeling performance of cement slurry. The cement slurry prepared in Example 1 was used to evaluate the anti-channeling property according to the API standard method. The test results are shown in Table 2.

[0022] The static gel strength development of the cement slurry prepared by the above-mentioned latex powder of different dosages in table 2

[0023]

[0024]

Embodiment 3

[0025] Embodiment 3: the elastic modulus test of cement stone

[0026] Mix different amounts of the above-mentioned latex powder into the oil well cement stone, cure the cement slurry according to the API specification method, and then demould, and test the elastic modulus of the cement stone. The test results are shown in Table 3.

[0027] The elastic modulus of the cement slurry prepared by the latex powder of different content in table 3

[0028]

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Abstract

The invention relates to novel cement paste for well cementation. The novel cement paste for well cementation is made from the following components of: by weight, 100 parts of hydraulic cement, 44 parts of water, 0.5-30 parts of a reversible latex powder and 0.2-0.5 parts of an antifoaming agent, wherein the reversible latex powder is prepared by spray drying of one component which can be selected from the group consisting of a natural rubber latex, SBR latex, a vinyl acetate-ethene emulsion, an organosilicon emulsion and a polyacrylate emulsion. The cement paste provided by the invention has excellent properties of controlling dehydration, preventing fluid channeling, improving mechanical properties of cement stone to prolong the endurance of the cement stone, reducing the permeability of the cement stone and raising the corrosion resistance of the cement stone. The above properties of the cement paste enable the cement paste to be applied in a plurality of cementing operations. The cement paste can be used to effectively improve the cementing job quality and raise the service life of the cement stone, and has an extensive application prospect.

Description

technical field [0001] The invention relates to an oil well cement slurry used in the field of oil field cementing and injection. Background technique [0002] The main purpose of the most widely used cement slurry in oil and gas well operations is to fill the annulus between the casing and the borehole wall interface. The cement slurry sets and hardens in the annulus to form impermeable cement stone. Its main functions are as follows: one is to support and protect the casing; the other is to isolate different layers in the well and prevent the fluids in different layers from channeling or flowing. [0003] The basic components of cement slurry are oil well cement and water. G-grade or H-grade oil well cement is generally used in cementing engineering to prepare cement slurry. The basic properties of cement slurry including fluidity and rheology, water loss, thickening time and compressive strength are adjusted by adding fluid loss reducing agent, dispersant and retarder,...

Claims

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Application Information

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IPC IPC(8): C09K8/467
Inventor 谭文礼高永会吕光明侯薇席方柱邹建龙谢承斌孙富全
Owner TIANJIN BO XING ENG SCI & TECH LIMITED COMPANY OF CNPC
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