Insulating liquid for injecting cement in oil well

A technology for oil well water injection and spacer fluid, which is applied in the direction of drilling compositions, chemical instruments and methods, can solve the problems of good stability, low critical flow rate, and low viscosity, and achieve system stability, dilution, and rheological improvement. Effect of Good Settling Stability

Active Publication Date: 2008-02-20
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention: by optimizing the suspending agent and diluent, provide a spacer fluid system with low viscosity, good stability, low critical flow velocity, and easy to realize turbulent flow, effectively displacing and clearing the mud in the well and mud cake, spacer fluid for oil well cementing to improve displacement efficiency

Method used

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specific Embodiment approach 2

[0024] For a density of 1.5g / cm 3 The spacer liquid is prepared by 100 parts by weight of fresh water, 100 parts by weight of weighting agent, 5 parts by weight of suspending agent, and 4 parts by weight of diluent.

[0025] First weighing 100 parts by weight of fresh water and adding 5 parts by weight of suspending agent and 4 parts by weight of diluent successively, stirring at a stirring speed of 4000rpm for 60 seconds to make a mixed solution, dissolving for 1 hour, adding 100 parts of weighting agent at a stirring speed of Add to the above solution within 20 seconds at 4000rpm, and then continue to stir for 30 seconds to prepare the spacer solution. The measured density is 1.5g / cm 3 . The prepared spacer liquid was transferred to an atmospheric thickener, stirred at 30°C for 20 minutes, taken out, and its rheological properties were measured with a six-speed rotational viscometer. In addition, another set of spacer liquid was prepared according to the above-mentioned p...

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PUM

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Abstract

The invention relates to an isolating liquid used in oil well cementing, comprising fresh water, suspension agent, thinner agent and aggravation agent. The invention is characterized in that: the suspension agent is made from hydroxy ethyl cellulose, carboxymethyl cellulose, xanthan and na-bentonite; the thinner agent is made from sodium lignosulphonate, sodium dodecyl benzene sulfonate and alkyl phenol polyoxyethylene ether; the aggravation agent is made from barite, fly ash, limestone and slag. When preparing the isolating liquid, the suspension agent is dissolved in water for one hour, thereafter thinner agent is added. Before cementing, the aggravation agent is added into the solution and mixed evenly. The isolating liquid is characterized by low viscosity, good rheological performance, slow critical velocity and being easy to form turbulent flow, so as to effectively substitute and wash mud, prevent forming mixed slurry of cement slurry and mud. Meanwhile, the invention can be compatible with ordinary cement slurry and mud system, thus diluting and improving cement slurry rheological performance.

Description

technical field [0001] The invention relates to a spacer fluid for oil well cementing, which can be used to separate mud and cement slurry in well cementing and cementing operations, so as to prevent the mud and cement slurry from contacting and polluting each other. Background technique [0002] The spacer fluid used in the early days was mainly the solution prepared by cementing admixture, which had good compatibility with the cement slurry system, but the compatibility with the mud was not ideal; in the late 1980s, many oil fields used sodium silicate spacer fluid The system is simple in composition and has a certain degree of viscosity and suspension, but sodium silicate has a coagulation-accelerating effect on cement slurry and is not ideally compatible with many cement slurry systems; in the 1990s, with the requirements for cementing quality It is getting higher and higher, and more attention is paid to the displacement characteristics, suspension characteristics, stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/56
Inventor 谭文礼谢承斌王翀高永会席方柱邹建龙霍明江
Owner BC P INC CHINA NAT PETROLEUM CORP
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