Low-temperature hardening scurry-proof cement slurry for well cementing

A technology of cementing cement and low-temperature early-strength agent, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of not significantly improving the gel strength of cement slurry, slow development of cement slurry gel strength, and shortening of cement slurry Problems such as thickening time can be improved to achieve the effect of improving anti-channeling ability, rapid strength development and improving cementing quality

Active Publication Date: 2008-02-20
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0002] In the existing cementing operation, there are shallow gas and surface aquifers, low pressure bearing capacity of the formation, and low operating temperature in winter, so that the gel strength of the cement slurry develops slowly, and the weight loss of the cement slurry causes the liquid column pressure to increase. If it is reduced, it will easily lead to the occurrence of water-gas channeling, which seriously affects the cementing quality
In view of the above problems, the existing m...

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 2

[0028] Low-temperature early-strength anti-channeling cement slurry for well cementing is characterized by 100 parts by weight of Portland cement, 70 parts by weight of water, 50 parts by weight of lightweight reinforcing agent, 4 parts by weight of low-temperature early-strength agent, and 3 parts by weight of anti-channeling agent. Channeling agent, 0.5 parts by weight of rheology modifier, 0.2 parts by weight of defoamer composition, its each admixture composition and application well condition are identical with specific embodiment 1, make 1.50g / cm2 3 The low-temperature early-strength anti-channeling cement slurry for well cementing is used for wells with a depth of 80-165 meters. Performance tests are listed in Table 1.

specific Embodiment approach 3

[0029]The low-temperature early-strength anti-channeling cement slurry for well cementing is characterized by 100 parts by weight of Portland cement, 60 parts by weight of water, 30 parts by weight of light reinforcing agent, 4 parts by weight of low-temperature early-strength agent, and 3 parts by weight of anti-channeling agent. Channeling agent, 0.5 parts by weight of rheology modifier, 0.2 parts by weight of defoamer, and the composition of each admixture is the same as that of Embodiment 1.

[0030] Make the above raw materials with a density of 1.60g / cm 3 Low-temperature early-strength anti-channeling cement slurry for well cementing, the application well conditions are drill bit size: 215.9mm, well depth and total length: 500m; reservoir casing size: 177.8mm, casing depth: 497.53m; choke ring position: 472.92 m; static temperature at the bottom of the well: 33°C; formation fracture pressure: 1.62g / cm 3 . Performance tests are listed in Table 1.

[0031] The test resu...

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Abstract

The invention relates to a low temperature early strength channeling control cement slurry, comprising portland cement, water, light strengthening agent, low-temperature early strength agent, channeling control agent, rheological performance adjusting agent and defoaming agent; wherein, the light strengthening agent consists of glass beads, fine cement, fine silicon powder and superfine, high-activity slag; the low-temperature early strengthening agent consists of sodium silicate, calcium sulphate and triethanolamine; the channeling control agent consists of polyvinyl alcohol, gypsum, poly naphthalene sulphonic sodium and borax; the rheological performance adjusting agent consists of sodium polystyrene sulfonate and calcium lignosulfonate; the defoaming agent consists of poly glycol dipropionate ether. The invention has the advantages of fast expanding speed of intensity in low temperature, strong channeling control and leakage resistance performance, low water lost and good rheological performance, and can be used as cementing material in low-temperature air layer, activity water layer and leakiness ground layer.

Description

technical field [0001] The invention relates to a low-temperature early-strength anti-channeling cement slurry for well cementing, in particular to a well cementing material for low-temperature gas layers, active water layers and easy-to-leakage formations. Background technique [0002] In the existing cementing operation, there are shallow gas and surface aquifers, low pressure bearing capacity of the formation, and low operating temperature in winter, so that the gel strength of the cement slurry develops slowly, and the weight loss of the cement slurry causes the liquid column pressure to increase. If it is lowered, it will easily lead to the occurrence of water-gas channeling, which seriously affects the cementing quality. In view of the above problems, the existing method of increasing the density of cement slurry has the disadvantage that it is very easy to cause the cement slurry to leak into the formation; the existing method of adding a coagulant such as calcium chl...

Claims

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Application Information

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IPC IPC(8): C09K8/56
Inventor 谢承斌张清玉刘勇高永会谭文礼
Owner BC P INC CHINA NAT PETROLEUM CORP
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