Well-cementing and self-healing cement slurry for oil-gas field

A self-healing technology for oil and gas fields, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of seepage reduction and anti-seepage performance, interlayer fluid inter-channeling, failure to function, etc., and achieve settlement stability Good, improved mechanical properties, adjustable thickening time

Active Publication Date: 2012-10-24
古莱特科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These externally induced cement sheath damages often result in the formation of micro-annulus that are so small that it is nearly impossible to pinpoint their exact location, let alone repair them
But even the smallest micro-annulus is enough to become a channel for fluid flow. Under high-energy concentrating flow and strong impact, it will cause the cement sheath to break and form micro-cracks.
All of these may lead to inte

Method used

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  • Well-cementing and self-healing cement slurry for oil-gas field
  • Well-cementing and self-healing cement slurry for oil-gas field
  • Well-cementing and self-healing cement slurry for oil-gas field

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1:

[0031] A self-healing cement slurry for oil and gas field cementing. Its raw material composition and quality are as follows:

[0032] The quality of G-grade oil well cement is 800g; acrylamide-acrylamide-2-methylpropanesulfonate copolymer 16g; natural oil-containing latex with 10% oil content 80g; OP-40 stabilizer 2g; lignosulfonate 8g; Tributyl phosphate defoamer 4g; Citric acid 0.24g; Water 282g.

[0033] The weighed amount of the slurry water is the total amount of water calculated according to the water-cement ratio, minus the water content in each additive.

[0034] The preparation method of the present invention is as follows: the content of each additive component is uniformly mixed at a low shear rate, then a certain amount of cement is weighed and added to the slurry formulation liquid, and the slurry is mixed according to the API standard to obtain the present invention.

Example Embodiment

[0035] Example 2:

[0036] A self-healing cement slurry for oil and gas field cementing. Its raw material composition and quality are as follows:

[0037] The quality of G-grade oil well cement is 800g, acrylamide-acrylamide-2-methylpropanesulfonate copolymer 16g; OP-40 stabilizer 2g; benzene-butadiene oil latex with 10% oil content 80g; lignin sulfonic acid Salt 8g; Tributyl phosphate defoamer 4g; Citric acid 0.24g; Water 282g.

Example Embodiment

[0038] Example 3:

[0039] A self-healing cement slurry for oil and gas field cementing. Its raw material composition and quality are as follows:

[0040] The quality of G-grade oil well cement is 800g, acrylamide-acrylamide-2-methylpropanesulfonate copolymer 24g; OP-40 stabilizer 2g; natural oil latex with 10% oil content 80g; lignosulfonate 8g; 4g organosilicon defoamer; 2.4g citric acid; 271.5g water.

[0041] The following is a comparative example to verify the use effect of the present invention:

[0042] Grade G oil well cement 800g, acrylamide-acrylamide-2-methylpropanesulfonate copolymer 16g; lignosulfonate 8g; tributyl phosphate 4g; citric acid 0.24g; tap water 324g.

[0043] Table 1 Basic properties of cement slurry

[0044]

[0045]

[0046] Table 2 Self-healing performance of cement slurry

[0047]

[0048] Note: "—" in Table 2 means that self-healing cannot be achieved.

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Abstract

The invention relates to well-cementing and self-healing cement slurry for an oil-gas field, which is suitable for the field of oil well cementation. The well-cementing and self-healing cement slurry comprises the following additives percentage by weight: 2-4% of fluid loss agent, 5-40% of self-healing component, 0.2-1.0% of stabilizing agent, 0.5-2.0% of dispersing agent, 0.3-1.0% of de-foaming agent, and 0.03-0.5% of retarding agent by taking the weight of cement as benchmark. A preparation method of the well-cementing and self-healing cement slurry is as follows: controlling the water cement ratio to be 0.44, uniformly mixing the additives at a low shearing speed, weighing a certain amount of cement, adding into slurry preparation liquid, and mixing with API (American petroleum institute) standards to obtain the well-cementing and self-healing cement slurry. The well-cementing and self-healing cement slurry has the characteristics of low water loss, adjustable thickening time, gas channeling prevention and excellent impervious performance and the like, has the functions of crack prevention and self healing, and remarkably improves the mechanical property of the cement.

Description

technical field [0001] The invention belongs to the field of well cementing and cementing in oil fields, and relates to well cementing cement slurry, in particular to a self-healing cement slurry for oil and gas field well cementing. Background technique [0002] In oil and gas well operations, the main purpose of cement slurry is to fill the annular space between the casing and the well wall interface. Its functions are 1. to support and protect the casing, and 2. to separate layers. It will form impermeable cement stone, which can prevent fluids from different layers from crossing each other. [0003] Various operations place certain stresses on the cement over time, and any one of these conditions can also cause damage to the cement sheath. These externally induced cement sheath damages often result in the formation of microannulus that are so small that it is almost impossible to pinpoint their exact location, let alone repair it. But even the smallest micro-annulus is...

Claims

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Application Information

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IPC IPC(8): C09K8/467C09K8/487
Inventor 郭丽梅王威耿国伟
Owner 古莱特科技股份有限公司
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