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Supersaturated potassium chloride cement paste for well cementation

A technology for cementing cement slurry and potassium chloride, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor cementation performance of complex salt gypsum layers, slow development of cementation strength, and inability to effectively resist, etc. To achieve the effect of simple cement slurry formula, easy to grasp construction safety performance, and convenient cementing operation

Inactive Publication Date: 2015-05-13
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cement slurry can effectively seal potassium-bearing stone rocks and silty mudstone formations containing stone rocks, gypsum and thenardite. The cement stone has high compressive strength and anti-channeling performance, which can effectively prolong the service life of oil and gas wells and ensure complex salt-gypsum formations Effective sealing of casing formations in well sections; effectively solve the problems caused by poor cementation performance of conventional cement slurry in complex salt-gypsum layers, slow development of gel strength, low early strength, and inability to effectively resist the external extrusion force caused by creep of salt formations The problem of deformation of thick-walled casing

Method used

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  • Supersaturated potassium chloride cement paste for well cementation
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1, the preparation of supersaturated potassium chloride cement slurry

[0068] Take each component according to the following parts by weight:

[0069] 100 parts of high sulfur-resistant G-grade cement, 35 parts of fresh water, 11 parts of anti-salt fluid loss reducer (AM-AMPS copolymer, molecular weight 100,000-2.5 million), preservative (active silica and water mass ratio 1:1 The mixture: 8 parts of active silica (particle size is 0.01 ~ 5μm), 19 parts of potassium chloride, 0.5 parts of enhanced anti-channeling agent (triisopropanolamine and potassium chloride, the mass ratio is 10:1), expansion Agent (1:19 mixture of activated magnesium oxide and calcium oxide, particle size 10-26μm) 0.5 parts, retarder (sodium hydroxyethylidene diphosphate) 0.6 parts.

[0070] The cement slurry was prepared according to the oil and gas well cementing cement slurry test standard ISO 10426-2003.

Embodiment 2

[0071] Embodiment 2, the preparation of supersaturated potassium chloride cement slurry

[0072] Take each component according to the following parts by weight:

[0073] 100 parts of high sulfur-resistant G-grade cement, 38 parts of fresh water, 13 parts of anti-salt fluid loss reducer (AM-AMPS copolymer, molecular weight 100,000-2.5 million), preservative (active silica and water mass ratio 1:1 Mixture of active silica: 0.01-5μm particle size) 10 parts, enhanced anti-channeling agent (triisopropanolamine and potassium chloride, mass ratio is 10:1) 0.5 parts, potassium chloride 21 parts, expansion Agent (mixture of active magnesium oxide and calcium oxide 1:19, particle size 10-26μm) 0.5 parts, retarder (sodium hydroxyethylidene diphosphate) 0.8 parts, weighting agent: (hematite, mesh number: 200 ~1200, density 5.0g / cm 3 ) 15 copies.

[0074] The cement slurry was prepared according to the oil and gas well cementing cement slurry test standard ISO 10426-2003.

Embodiment 3

[0075] Embodiment 3, the preparation of supersaturated potassium chloride cement slurry

[0076] Take each component according to the following parts by weight:

[0077] 100 parts of high sulfur-resistant G-grade cement, 42 parts of fresh water, 14 parts of anti-salt fluid loss reducer (AM-AMPS copolymer, molecular weight 100,000-2.5 million), preservative (active silica and water mass ratio 1:1 Mixture of active silica: 0.01-5μm particle size) 10 parts, enhanced anti-channeling agent (triisopropanolamine and potassium chloride, mass ratio is 10:1) 0.5 parts, potassium chloride 23 parts, expansion Agent (mixture of active magnesium oxide and calcium oxide 1:19, particle size 10-26μm) 0.5 parts, retarder (sodium hydroxyethylidene diphosphate) 0.9 parts, weighting agent: (hematite, mesh number: 200 ~1200, density 5.0g / cm 3 ) 52 copies.

[0078] The cement slurry was prepared according to the oil and gas well cementing cement slurry test standard ISO 10426-2003.

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Abstract

The invention discloses supersaturated potassium chloride cement paste for well cementation. The cement paste is prepared from the following components: high sulfate-resistant G-grade cement, a salt-bearing fluid loss reducer, a preservative, a retarder, water, potassium chloride, a reinforced anti-migration additive, an expanding agent and a weighting agent. The supersaturated potassium chloride cement paste has the effects of stabilizing a well wall and improving the well wall strength; supersaturated potassium chloride assists a cement paste to resist the influence of mirabilite, gypsum, sodium, potassium, magnesium and other halite in an evaporite bed; the technology is reliable; the field construction is simple and convenient; the well cementation effect is good; the requirements on well cementation in the evaporite bed, a high-pressure deep well evaporite bed and a super-thick evaporite bed and other complex conditions can be met; the supersaturated potassium chloride cement paste has favorable application prospect particularly for the exploration and development of a potassium bittern water well.

Description

technical field [0001] The invention relates to a cement slurry for petroleum drilling and cementing, in particular to a supersaturated potassium chloride cementing cement slurry. Background technique [0002] Salt bed cementing has always been a major problem in the engineering field, and it still cannot be completely solved so far. The complexity of salt layer cementing is mainly manifested in the following four aspects: First, during the drilling process, the salt layer will dissolve, plastic deformation and creep flow will occur, resulting in the formation of irregular wellbore, and it is difficult to improve the displacement efficiency; It is because salt has complex effects on the performance of cement slurry under different concentrations and different temperatures. Using ordinary cement slurry to cement the well will cause the water in the cement slurry to flow to the salt layer, and the well wall is prone to expansion, causing the well diameter to expand or become u...

Claims

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Application Information

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IPC IPC(8): C09K8/493C09K8/48C09K8/467
Inventor 朱荣东许明标蒋世全周建良王晓亮姜智博
Owner CHINA NAT OFFSHORE OIL CORP
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