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Mud cake hardening enhancer for drilling fluid

A technology of reinforcing agent and hardening agent, which is applied in the field of drilling fluid additives to achieve the effects of improving hardening, good cementing effect, and improving cementing strength

Active Publication Date: 2021-03-12
北京奥凯立科技发展股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The drilling mud cake hardening enhancer disclosed in Chinese patent document CN 104119843 A has improved the sealing quality of the cementing interface and the cementing strength of the two cementing interfaces to a certain extent, so that the high-quality rate of the cementing has increased by 30.6 percentage points; but there are still the following problems to be solved: Further improvements: the bonding strength of cementing interface 1 is increased by less than 10%, especially the bonding strength of cementing interface 2 is increased by less than 30%.

Method used

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  • Mud cake hardening enhancer for drilling fluid
  • Mud cake hardening enhancer for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 32g of bishydroxyethoxypropyl polydimethylsiloxane, 48g of whisker silicon, the fiber length of whisker silicon is 300 μm, the diameter is 5 μm, 3-aminopropylmethyldiethoxysilane 6g, layered crystalline sodium disilicate 10g, acrylic acid-hydroxypropyl acrylate copolymer T-225 4g, mixed with each other evenly to prepare mud cake hardening enhancer product for drilling fluid.

Embodiment 2

[0033] Weigh 35g of bishydroxyethoxypropyl polydimethylsiloxane, 42g of whisker silicon, the fiber length of whisker silicon is 150 μm, the diameter is 10 μm, 3-aminopropylmethyldiethoxysilane 8g, 12g of layered crystalline sodium disilicate, and 3g of acrylic acid-hydroxypropyl acrylate copolymer T-225, mixed with each other evenly to prepare mud cake hardening enhancer for drilling fluid.

Embodiment 3

[0035] Weigh 38g of bishydroxyethoxypropyl polydimethylsiloxane, 36g of whisker silicon, the fiber length of whisker silicon is 500 μm, the diameter is 10 μm, 3-aminopropylmethyldiethoxysilane 10g, layered crystalline sodium disilicate 14g, acrylic acid-hydroxypropyl acrylate copolymer T-225 2g, mixed with each other evenly to prepare mud cake hardening enhancer for drilling fluid.

[0036] The performance evaluation of the mud cake hardening enhancer for drilling fluid in the above-mentioned embodiment was performed by the following method.

[0037] (1) Compatibility with drilling fluid and high temperature resistance evaluation methods are as follows:

[0038]The drilling fluid used is 4% base slurry. The 4% base slurry is to add 4g of sodium bentonite per 100mL of water, stir well, seal and let stand, and maintain at room temperature for 24 hours to hydrate to obtain base slurry.

[0039] (1.1) Performance evaluation at room temperature: Prepare 4 slurry cups, labeled 1#, ...

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Abstract

The invention discloses a mud cake hardening enhancer for drilling fluid, which is characterized in that the mud cake hardening enhancer is composed of polysilicone, mud cake hardener, low molecular weight polymer, film forming agent and organic chelating agent; , The mass ratio of mud cake hardener, low molecular weight polymer, film forming agent and organic chelating agent is 30-45:35-50:5-12:8-15:2-8. Adding mud cake hardening enhancers to drilling fluid and completion fluid can effectively change the properties of drilling fluid mud cake, improve the quality of drilling fluid mud cake, reduce the thickness of mud cake, form thin and tough mud cake, increase the strength of mud cake, and then Improve the interface bonding strength during cementing, and change the physical bonding of the cementing interface into chemical affinity, thereby improving the interface bonding quality between the mud cake and the cement sheath, and between the casing and the cement sheath, and reducing the interface bonding. Permeability improves the high quality rate of cementing, prolongs the service life of oil and gas wells, and correspondingly increases the oil recovery rate.

Description

technical field [0001] The invention relates to a drilling fluid additive in petroleum drilling engineering. More specifically, it relates to a mud cake hardening enhancer for drilling fluid. Background technique [0002] Well cementing construction is one of the important procedures in the process of oil and gas well exploitation. The main purpose of well cementing is to seal off the formation, seal off the oil, gas and water layers, prevent the fluids between the formations from channeling each other, and protect the production layer. It is said that if a well wants to achieve its due productivity, it mainly depends on the quality of interlayer isolation achieved during the cementing process. When the cementing quality is not good, there will be phenomena such as interlayer channeling and pipe leakage after putting into production, which will seriously affect the subsequent oil and gas production and the life of the oil well. [0003] Theoretically speaking, the cementin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/08
Inventor 卢彦丽张金龙张建伟王雷卢丙朵冯素敏刘晓静彭辉张雪源杨晓岭柴奎
Owner 北京奥凯立科技发展股份有限公司
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