Anti-flow cementing slurry for well cementation

A cementing slurry and anti-channeling technology, which is applied in the drilling composition, chemical instruments and methods, etc., can solve the problem that the temperature, shearing and aging time of the latex anti-channeling cement slurry have great influence, and the compatibility of additives High requirements, difficult to control the gas generation time, etc., to achieve the effect of improving the resistance to fluid intrusion, wide application density and excellent performance

Active Publication Date: 2013-11-27
成都欧美克石油科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas-generating anti-channeling cement slurry is basically limited to the application in low-temperature shallow wells. Because the gas-generating time is difficult to control, this anti-channeling measure is generally not used in high-temperature deep well cementing operations. The latex non-permeable anti-channeling cement slurry must have matching latex Stabilizers and other admixtures can only be used, and the compatibility requirements of the admixtures are high, and the latex anti-channeling cement slurry is greatly affected by temperature, shearing, and aging time. It is more affected by external influences during construction, and it is inconvenient to operate on site. And it is easy to cause cementing accidents. In the northeast of Sichuan, there have been three cementing accidents caused by latex cement slurry due to aging time.

Method used

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Embodiment 1

[0032] Embodiment 1: the present invention provides a kind of low-density colloidal type anti-gas channeling cement slurry, the weight percentage of each component is based on 100% G grade cement, and the percentage of various additives accounting for G grade cement weight is: 50% lightening agent, 25% high-temperature strength stabilizer, 17% anti-channeling agent for acrylic modified ketone-aldehyde resin prepared by the present invention, 1.35% salt-resistant retarder, 0.2% defoamer, 70% tap water. The high-temperature strength stabilizer is microsilicon or amorphous silica with a purity greater than 95%, the salt-resistant retarder is acrylamide polymer, and the defoamer is polyether.

[0033] The raw materials were mixed and stirred together to prepare well cementing cement slurry, and the relevant properties of the cement slurry were measured, as shown in Table 1 and Table 2.

Embodiment 2

[0034] Embodiment 2: the present invention provides a kind of conventional density micelle type anti-gas channeling cementing cement slurry, the percentage by weight of each component is based on 100% G grade cement, and the percentage of various additives accounting for G grade cement weight is: 30% high-temperature strength stabilizer, 8% modified ketone-formaldehyde resin anti-channeling agent prepared by the present invention, 1.2% salt-resistant retarder, 0.2% defoamer, 44% tap water. The high-temperature strength stabilizer is microsilicon or amorphous silica with a purity greater than 95%, the salt-resistant retarder is acrylamide polymer, and the defoamer is polyether. The raw materials were mixed and stirred together to prepare well cementing cement slurry, and the relevant properties of the cement slurry were measured, as shown in Table 1 and Table 2.

Embodiment 3

[0035] Embodiment 3: the present invention provides a kind of high density (2.20g / cm 3 ) Colloidal type anti-gas channeling cement slurry, the weight percentage of each component is based on 100% G-grade cement, and the percentage of various additives in the weight of G-grade cement is: 95% weighting agent, 30% high temperature stable strength agent, 4.5% modified ketone-formaldehyde resin anti-channeling agent prepared by the present invention, 1.5% anti-salt retarder, 0.15% defoamer, 36% tap water. The high-temperature strength stabilizer is microsilicon or amorphous silica with a purity greater than 95%, the salt-resistant retarder is acrylamide polymer, and the defoamer is polyether. The raw materials were mixed and stirred together to prepare well cementing cement slurry, and the relevant properties of the cement slurry were measured, as shown in Table 1 and Table 2.

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Abstract

The invention discloses anti-flow cementing slurry for well cementation, which comprises the following components by weight: 100 parts of cement, 0.2-3.5 parts of salt-resisting retarder, 0.1-0.2 part of defoaming agent, 6-30 parts of high-temperature strength stabilizing agent, 28-80 parts of water and 4.5-18 parts of gas-channeling preventing agent, wherein the weight of the cement is taken as the standard; the retarder adopts high polymer taking acrylamide as molecular main chain; polyether is taken as the defoaming agent; the high-temperature strength stabilizing agent adopts micro-silicon or amorphous silicon dioxide with the purity being larger than 95 %; and the anti-flow agent adopts ketone resin modified by acrylic acid. The anti-flow cementing slurry for well cementation has better combination property than that of the prior art and especially has high anti-flow capability.

Description

technical field [0001] The invention belongs to the field of oil field chemistry of petroleum and natural gas drilling engineering technology, and in particular relates to anti-channeling cementing cement slurry. Background technique [0002] In oil and gas exploration and development drilling, the casing is run in the wellbore and cement is injected into the annular space between the casing and the wellbore. This process is called well cementing. The quality of cementing directly determines whether the subsequent oil and gas production is smooth and the length of production time. During cementing, the blocking effect of annular cement slurry on the fluid and gas in the formation is directly related to whether the cement sheath can effectively seal the formation with different pressure systems, and directly related to the quality of the cementing. More and more attention has been paid to the anti-channeling effect of cement slurry, and the anti-channeling performance of cem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/487
Inventor 曹智潘军李勇
Owner 成都欧美克石油科技股份有限公司
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