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A technology of reinforcing agent and drilling fluid, which is applied in the field of drilling fluid additives to achieve stable product performance, improved cementing quality, and improved cementing quality.
Active Publication Date: 2018-09-28
北京奥凯立科技发展股份有限公司 +1
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The drilling mud cake hardening enhancer disclosed in Chinese patent document CN 104119843A 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; Improvements: The bonding strength of the first cementing interface is increased by less than 10%, especially the cementing strength of the second cementing interface is increased by less than 30%.
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Embodiment 1
[0031] Weigh 32g of bishydroxyethoxypropyl polydimethylsiloxane, 48g of silicon whisker, fiber length of silicon whisker of 300μm, diameter of 5μm, 3-aminopropylmethyldiethoxysilane The weight is 6g, the layered crystalline sodium disilicate is 10g, the acrylic acid-hydroxypropyl acrylate copolymer T-225 is 4g, and they are mixed uniformly to prepare a mud cake hardening enhancer product for drilling fluid.
Embodiment 2
[0033] Weigh 35g of bishydroxyethoxypropyl polydimethylsiloxane, 42g of silicon whisker, fiber length of silicon whisker of 150μm, diameter of 10μm, 3-aminopropylmethyldiethoxysilane The weight is 8g, the layered crystalline sodium disilicate is 12g, the acrylic acid-hydroxypropyl acrylate copolymer T-225 is 3g, and they are mixed uniformly to prepare a mud cake hardening enhancer product for drilling fluid.
Embodiment 3
[0035] Weigh 38g of bishydroxyethoxypropyl polydimethylsiloxane, 36g of silicon whisker, fiber length of silicon whisker of 500μm, diameter of 10μm, 3-aminopropylmethyldiethoxysilane The weight is 10g, the layered crystalline sodium disilicate is 14g, the acrylic acid-hydroxypropyl acrylate copolymer T-225 is 2g, and they are mixed uniformly to prepare a mud cake hardening enhancer product for drilling fluid.
[0036] The performance evaluation of the mud cake hardening enhancer for drilling fluids of the above examples was performed by the following methods.
[0037] (1) The evaluation methods of compatibility with drilling fluid and high temperature resistance are as follows:
[0038] The drilling fluid used is a 4% base slurry, which is to add 4 g of sodium bentonite per 100 mL of water to fully stir it evenly, seal it and let it stand, and cure it at room temperature for 24 hours to obtain a base slurry.
[0039] (1.1) Room temperature performance evaluation: prepare 4 slurry cups...
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Abstract
The invention discloses a mud cake hardening enhancer for drilling fluid. The enhancer is characterized by composing polysiloxane, a mud cake hardener, a low molecular weight polymer, a film former and an organic chelating agent; the mass ratio of the mud cake hardener, the low molecular weight polymer, the film former and the organic chelating agent is 30-45:35-50:5-12:8-15:2-8. By adding the mudcake hardening enhancer to the drilling fluid and completion fluid, the properties of a drilling fluid mud cake can be effectively changed, the quality of the drilling fluid mud cake can be improved,the thickness of the mud cake can be reduced, the thin and tough mud cake can be formed, the strength of the mud cake can be increased, thereby improving the interface cementation strength during well cementing, the physical combination of a cementing interface is transformed into chemical affinity, thereby improving the interface cementation quality between the mud cake and a cement ring and a casing and the cement ring, the interface cementation permeability rate is reduced, the cementing quality rate is improved, the service life of oil and gas wells is prolonged, and a crude oil recoveryratio is correspondingly improved.
Description
Technical field [0001] The invention relates to drilling fluid additives in petroleum drilling engineering. More specifically, it relates to a mud cake hardening enhancer for drilling fluid. Background technique [0002] Cementing construction is one of the important processes in the production process of oil and gas wells. The main purpose of cementing is to seal the formation, seal the oil, gas, and water layers, prevent fluids from flowing between the formations, and protect the production layer. In other words, if a well wants to achieve its due productivity, it mainly depends on the quality of the interlayer packing achieved during the cementing process. When the cementing quality is not good, interlayer channeling and out-of-pipe collapse will occur after production, which will seriously affect the subsequent oil and gas production and well life. [0003] Theoretically speaking, the cementing interface should actually be the cementation interface between the solidified body...
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