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Large temperature difference cement slurry for cementing of deep well long isolation section and preparation method thereof

A large temperature difference, cement slurry technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of large annular flow velocity of cement slurry, increased annular flow resistance, and increased wellbore temperature difference, etc. The effect of preventing the problem of water and gas channeling, small water loss and low cost

Active Publication Date: 2013-03-13
SOUTHWEST PETROLEUM UNIV
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  • Claims
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Problems solved by technology

For the cementing of the long sealing section, there are also some problems in the cementing of ordinary low-density cement slurry, mainly as follows: ① The long sealing section increases the temperature difference between the top and bottom of the wellbore (for example, the length of the sealing section is 3000 meters , if the geothermal gradient is 2°C / 100m, the static temperature difference between the upper and lower sides of the sealing section will reach more than 50°C), and the cement slurry at the top will not solidify for a long time, seriously affecting the follow-up operations
②In order to improve the displacement efficiency, the flow velocity of cement slurry in the annular space is high, and the flow resistance of the annular space is also increased. During the cementing process, high over-balance pressure is easily formed to cause formation leakage.
There are similar systems available abroad, but the cost is extremely high
Moreover, due to the reliability of its technology and tools in foreign countries, it is generally not necessary to carry out cementing operations for super-long sealing sections, so there is no need for the circulation temperature to be higher than 110°C, and the temperature difference between the top of the cement slurry column and the circulation temperature to be between 40°C and 100°C. Cementing cement slurry with high temperature and large temperature difference between ℃ and large temperature difference is systematically studied and reported, and only in-depth research is carried out on the aspects of anti-high temperature admixture, anti-gas channeling technology and improving displacement efficiency to improve the quality of deep well cementing

Method used

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  • Large temperature difference cement slurry for cementing of deep well long isolation section and preparation method thereof
  • Large temperature difference cement slurry for cementing of deep well long isolation section and preparation method thereof
  • Large temperature difference cement slurry for cementing of deep well long isolation section and preparation method thereof

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Embodiment 1

[0038] Weigh 100 parts by weight of oil well cement, 0.5 parts by weight of silica fume, 0.5 parts by weight of fly ash, 2 parts by weight of superfine cement, 0.5 parts by weight of bentonite for drilling fluid, 0.2 parts by weight of sodium silicate, 0.3 parts by weight of triethanolamine, 3 parts by weight of aluminum powder are dry mixed into a dry powder mixture. Measure 85 parts by weight of water, weigh 7 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 0.85 parts by weight of ethylenediaminetetramethylene phosphoric acid, and dissolve 0.5 parts by weight of sulfonated alkylnaphthalene formaldehyde resin in water , put the aqueous solution in the mixing container, the agitator rotates at a low speed (4000±200 rpm), and add the weighed dry powder mixture within 15 seconds, cover the lid of the agitator, and turn it at a high speed (12000±500 rpm) Min) and continue to stir for 35 seconds to obtain the cement slurry with large temperature difference for deep w...

Embodiment 2

[0040] Weigh 100 parts by weight of oil well cement, 5 parts by weight of silicon powder, 1 part by weight of fly ash, 0.5 parts by weight of superfine cement, 1 part by weight of bentonite for drilling fluid, 0.5 parts by weight of sodium thiosulfate, and 0.2 parts by weight of sodium nitrate , 3 parts by weight of aluminum powder are dry mixed into a dry powder mixture. Measure 85 parts by weight of water, weigh 6.5 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 1.7 parts by weight of ethylenediamine tetramethylene phosphoric acid, and dissolve 1 part by weight of sulfonated alkylnaphthalene formaldehyde resin in water , put the aqueous solution in the mixing container, the agitator rotates at a low speed (4000±200 rpm), and add the weighed dry powder mixture within 15 seconds, cover the lid of the agitator, and turn it at a high speed (12000±500 rpm) Min) and continue to stir for 35 seconds to obtain the cement slurry with large temperature difference for the...

Embodiment 3

[0042] Weigh 100 parts by weight of oil well cement, 10 parts by weight of silicon powder, 0.5 parts by weight of fly ash, 5 parts by weight of superfine cement, 1.5 parts by weight of bentonite for drilling fluid, 1 part by weight of sodium nitrate, and 0.2 parts by weight of triisopropanol 2.8 parts by weight of amine and aluminum powder are dry-blended to form a dry powder mixture. Measure 85 parts by weight of water, weigh 6 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, 2.1 parts by weight of ethylenediamine tetramethylene phosphoric acid, and dissolve 1.5 parts by weight of sulfonated alkylnaphthalene formaldehyde resin in water , put the aqueous solution in the mixing container, the agitator rotates at a low speed (4000±200 rpm), and add the weighed dry powder mixture within 15 seconds, cover the lid of the agitator, and turn it at a high speed (12000±500 rpm) Min) and continue to stir for 35 seconds to obtain the cement slurry with large temperature diff...

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Abstract

The invention relates to large temperature difference cement slurry for cementing of deep well long isolation sections and a preparation method thereof; the large temperature difference cement slurry for cementing of deep well long isolation sections comprises the following components by weight: 100 parts of oil well cement, 0.5-35 parts of high temperature stabilizers, 0.5-65 parts of density conditioning agents, 0.5-30 parts of ultrafine cementitious materials, 40-85 parts of water, 3-7 parts of filtrate reducers, 0.5-3 parts of retarders, 0.5-2 parts of drag reduction agents, 0.5-3 parts of suspension stabilizers, 0.5-3 parts of anti-migration additives, and 0.5-3 parts of intensity conditioning agents. The cement slurry of the invention has the advantages of strong super-retarding resistance, low filtration water loss, good slurry sedimentation stability, strong water vapor migration resistance, and high cement paste early-stage compressive strength during large temperature difference cementing work, can effectively improve the large temperature difference cementing quality of long isolation sections, and protect oil gas layers. Meanwhile the cement slurry is simple in proportioning, has strong operationality for on-site application, and can be popularized and applied in deep well complex area block wells.

Description

technical field [0001] The present invention relates to a set of density 1.2-1.9g / cm 3 The cement slurry system and preparation method of the deep well long sealing section cementing with large temperature difference are especially suitable for long sealing section and large temperature difference cementing operation with a sealing section length of 3000-6000 meters and a temperature difference of 40-100 °C. Background technique [0002] Well cementing is an extremely important part of the drilling and completion process, and it is a one-time project. The quality of cementing directly determines the productivity and life of a well oil layer. High temperature deep well cementing operation is a difficult point in well cementing work, and long sealing section large temperature difference cementing is one of the difficult points in high temperature deep well cementing operation. [0003] With the sharp increase in energy demand, the number of deep wells and ultra-deep wells als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42
Inventor 郭小阳李早元付洪琼程小伟岳家平李明张松辜涛
Owner SOUTHWEST PETROLEUM UNIV
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