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A drag-reducing material and drag-reducing cement slurry for precise pressure-controlled cementing

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

Active Publication Date: 2022-04-19
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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  • A drag-reducing material and drag-reducing cement slurry for precise pressure-controlled cementing
  • A drag-reducing material and drag-reducing cement slurry for precise pressure-controlled cementing
  • A drag-reducing material and drag-reducing cement slurry for precise pressure-controlled cementing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The present embodiment of a drag reduction cement slurry system for controlled pressure cementing (1.90g / cm 3 ) consists of the following (mass parts):

[0062] 100 parts G-class oil well cement, 46 parts fresh water, 10 parts resistance reduction material, 1.5 part suspension stabilizer, 3 parts water loss reducing agent, 0.5 parts retardant, 0.6 part defoamer.

[0063] Among them, the resistance reduction material is composed of a drag reducer, a drag reduction particle, a polymer active agent, sodium sulfamate and phosphate ester, and the content of each component in the 10 parts of the resistance reduction material is as follows: 0.9 parts of alkali inhibitor, 3.5 parts of resistance reduction particles, 4.4 parts of polymer active agent, 0.9 parts of sodium sulfamate, 0.3 parts of phosphate ester;

[0064] Among them, the drag reducer is sulfonated ketoaldehyde polypolymer, the material of the drag reduction particles is spherical trimanganese tetroxide, which is com...

Embodiment 2

[0088] The present embodiment of a drag reduction cement slurry system for controlled pressure cementing (2.00g / cm 3 ) is composed as follows:

[0089] 100 parts G-class oil well cement, 46 parts fresh water, 20 parts weighting agent, 12 parts drag reduction material, 2 parts suspension stabilizer, 3 parts water loss reducing agent, 0.4 parts retardant, 0.6 part defoamer.

[0090] Among them, the resistance reduction material is composed of a drag reducer, a drag reduction particle, a polymer active agent, sodium sulfamate and phosphate ester, and the content of each component in the 12 parts of the resistance reduction material is as follows: 1.08 parts of alkali inhibitor, 4.2 parts of resistance reduction particles, 5.28 parts of polymer active agent, 1.08 parts of sodium aminosulfonate, 0.36 parts of phosphate ester;

[0091] Among them, the drag reducer is sulfonated ketoaldehyde polypolymer, the material of the drag reduction particles is spherical trimanganese tetroxide, ...

Embodiment 3

[0094] The present embodiment of a drag-reducing cement slurry system for controlled pressure cementing (2.1g / cm 3 ) is composed as follows:

[0095] 100 parts G-class oil well cement; 52 parts fresh water; 50 parts weighted material; 15 parts resistance reduction material; 2 parts suspension stabilizer; 6 parts water loss reducing agent; 0.3 parts retardant; 0.6 part defoamer.

[0096] Among them, the resistance reduction material is composed of a drag reducer, a drag reduction particle, a polymer active agent, sodium sulfamate and phosphate ester, and the content of each component in the 15 parts of the resistance reduction material is as follows: 1.35 parts of alkali inhibitor, 5.25 parts of resistance reduction particles, 6.6 parts of polymer active agent, 1.35 parts of sodium aminosulfonate, 0.45 parts of phosphate ester;

[0097] Among them, the drag reducer is sulfonated ketoaldehyde polypolymer, the material of the drag reduction particles is spherical trimanganese tetro...

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Abstract

The invention discloses a drag-reducing material and drag-reducing cement slurry for precise pressure-controlled well cementing. The drag-reducing material for pressure-controlled well cementing consists of drag-reducing agent, drag-reducing particles, polymer active agent, sodium sulfamate and phosphate ester. The drag-reducing cement for the pressure-controlled cementing can be prepared from the cement and the drag-reducing material for the pressure-controlled cementing, and the mass of the drag-reducing material for the pressure-controlled cementing is 10-18% of the cement mass. The drag-reducing cement slurry for pressure-controlled cementing can be prepared from at least one of the drag-reducing cement for pressure-controlled cementing, water and fluid loss reducer, retarder, defoamer, suspension stabilizer and weighting agent. The drag-reducing cement slurry for pressure-controlled cementing of the present invention has the characteristics of good rheology, low frictional resistance, low fluid loss, arbitrarily adjustable thickening time, stable thickening performance, simple formula composition and on-site construction, etc. Technical requirements for well cementing and injection.

Description

Technical field [0001] The present invention relates to a fine pressure control cementing well with a drag reduction material and a drag reduction cement slurry, belongs to the field of petroleum engineering technology. Background [0002] With the exploration and development of oil and gas resources gradually moving towards deep water depths, the problem of cementing wells in narrow density window formations has become increasingly prominent. Due to the narrow operating density window, it is difficult to achieve the pressure balance of the whole process of cementing, and it is very easy to overflow and leakage phenomenon and lead to the failure of cementing operation. [0003] Fine pressure control cementing technology can effectively solve the problem of safe cementing of narrow density window formation, which requires the fluid entering the well in the process of pressure control cementing to have low annular air friction resistance performance, to ensure the accurate control...

Claims

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Application Information

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Patent Type & Authority Patents(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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