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Anti-drag material for fine pressure-controlled well cementation and anti-drag cement paste

A drag-reducing water and well cementing technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of small wellhead back pressure compensation space, large cement slurry annular friction resistance, and inability to achieve fine grout injection stage. Problems such as pressure control, to achieve the effect of improved rheological properties, stable thickening performance, and good sedimentation stability

Active Publication Date: 2021-07-02
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Selecting a low annular friction cement slurry system is the key to ensure the success of pressure-controlled cementing. Conventional cement slurry systems do not add special drag-reducing materials, resulting in high annular friction of the cement slurry and smaller wellhead back pressure compensation space. Unable to achieve precise pressure control in the grouting stage
[0004] At present, there are few drag-reducing materials and low-friction cement slurry systems suitable for fine pressure-managed cementing, which are still in the initial development and exploration stage, and have great research value and application prospects in pressure-managed cementing

Method used

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  • Anti-drag material for fine pressure-controlled well cementation and anti-drag cement paste
  • Anti-drag material for fine pressure-controlled well cementation and anti-drag cement paste
  • Anti-drag material for fine pressure-controlled well cementation and anti-drag cement paste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The drag-reducing cement slurry system (1.90g / cm 3 ) is composed as follows (parts by mass):

[0062] 100 parts of G grade oil well cement; 46 parts of fresh water; 10 parts of drag reducing material; 1.5 parts of suspension stabilizer; 3 parts of fluid loss reducer; 0.5 part of retarder; 0.6 part of defoamer.

[0063] Among them, the drag reducing material is composed of drag reducing agent, drag reducing particles, polymer active agent, sodium sulfamate and phosphoric acid ester. The content of each component in 10 parts of drag reducing material is as follows: 0.9 parts of alkali drag reducing agent, 0.9 parts of drag reducing particles, 3.5 parts, 4.4 parts of polymer active agent, 0.9 part of sodium sulfamate, 0.3 part of phosphoric acid ester;

[0064] Among them, the drag reducing agent is sulfonated ketone aldehyde condensation polymer, and the material of drag reducing particles is spherical trimanganese tetroxide, which consists of 400 mesh (low mesh) spheric...

Embodiment 2

[0088] The drag-reducing cement slurry system (2.00g / cm 3 ) is composed as follows:

[0089] 100 parts of G grade oil well cement; 46 parts of fresh water; 20 parts of weighting agent; 12 parts of drag reducing material; 2 parts of suspension stabilizer;

[0090] Among them, the drag reducing material is composed of drag reducing agent, drag reducing particles, polymer active agent, sodium sulfamate and phosphoric acid ester. The content of each component in 12 parts of drag reducing material is as follows: 1.08 parts of alkali drag reducing agent, 1.08 parts of drag reducing particles, 4.2 parts, 5.28 parts of polymer active agent, 1.08 parts of sodium sulfamate, 0.36 parts of phosphoric acid ester;

[0091] Among them, the drag reducing agent is sulfonated ketone aldehyde condensation polymer, and the material of drag reducing particles is spherical trimanganese tetroxide, which consists of 400 mesh (low mesh) spherical solid particles and 800 mesh (high mesh) balls. Type ...

Embodiment 3

[0094] The drag-reducing cement slurry system (2.1g / cm 3 ) is composed as follows:

[0095] 100 parts of G grade oil well cement; 52 parts of fresh water; 50 parts of weighting material; 15 parts of drag reducing material; 2 parts of suspension stabilizer;

[0096] Among them, the drag reducing material is composed of drag reducing agent, drag reducing particles, polymer active agent, sodium sulfamate and phosphoric acid ester. The content of each component in 15 parts of drag reducing material is as follows: 1.35 parts of alkali drag reducing agent, 1.35 parts of drag reducing particles, 5.25 parts, 6.6 parts of polymer active agent, 1.35 parts of sodium sulfamate, 0.45 parts of phosphoric acid ester;

[0097] Among them, the drag reducing agent is sulfonated ketone aldehyde condensation polymer, and the material of drag reducing particles is spherical trimanganese tetroxide, which consists of 400 mesh (low mesh) spherical solid particles and 800 mesh (high mesh) balls. Typ...

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Abstract

The invention discloses an anti-drag material for fine pressure-controlled well cementation and anti-drag cement paste. The anti-drag material for pressure-controlled well cementation is composed of a drag reducer, drag reducing particles, a polymer active agent, sodium sulfamate and phosphate. Anti-drag cement for pressure-controlled well cementation can be prepared from the cement and the anti-drag material for pressure-controlled well cementation, and the mass of the anti-drag material for pressure-controlled well cementation is 10-18% of that of the cement. The anti-drag cement paste for pressure-controlled well cementation can be prepared from the anti-drag cement for pressure-controlled well cementation, water and at least one of a fluid loss agent, a set retarder, a defoaming agent, a suspension stabilizer and a weighting agent. The anti-drag cement paste for pressure-controlled well cementation has the characteristics of good rheological property, low friction resistance, low filter loss, randomly adjustable thickening time, stable thickening performance, simple formula composition and site construction and the like, and can meet the technical requirements of pressure-controlled well cementation cementing.

Description

technical field [0001] The invention relates to a drag-reducing material and a drag-reducing cement slurry for fine pressure-controlled well cementing, and belongs to the technical field of petroleum engineering. Background technique [0002] As the exploration and development of oil and gas resources gradually move towards deep water and deep formations, the problem of cementing in formations with narrow density windows has become increasingly prominent. Due to the narrow operating density window, it is difficult to achieve pressure balance in the whole process of cementing, and overflow and leakage are prone to occur, resulting in the failure of cementing operations. [0003] The precision managed pressure cementing technology can effectively solve the problem of safe cementing in narrow density window formations. This technology requires that the fluid entering the well during the pressure controlled cementing process has low annular friction performance, so as to ensure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C09K8/467
CPCC04B28/04C09K8/467C09K2208/28C04B2201/20C04B2201/50C04B22/06C04B24/26C04B24/003C04B24/16C04B22/04C04B2103/0068C04B2103/22C04B2103/50
Inventor 武治强杨向前李中范白涛郭华张兴全岳家平任美鹏郭宗禄
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD
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