A microbubble drilling fluid

A drilling fluid and micro-bubble technology, which is applied in the field of drilling fluid, can solve the problems of lack of treatment agent for bonding and film-forming micro-cracks in the well wall, leakage prevention needs to be further strengthened, and micro-fracture plugging performance is insufficient, etc., to achieve Inhibit the hydration dispersion effect, reduce the probability of drilling fluid loss, good leakage prevention effect

Active Publication Date: 2022-07-08
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the anti-compression performance of microfoam drilling fluid foam in the prior art is insufficient. Under the condition of high pressure at the bottom of the well, the volume of the foam shrinks and even the air escapes from the foam, and the system lacks the ability to form a film and seal on the well wall. As a treatment agent for micro-fractures on the borehole wall, the micro-bubble drilling fluid system has insufficient plugging performance on micro-fractures under high temperature and high pressure at the bottom of the well, and the leakage prevention performance needs to be further strengthened

Method used

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  • A microbubble drilling fluid
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Example 1 Preparation of Foam Enhancer

[0075] Dissolve 10g of dodecyldimethylallyl ammonium chloride in 100g of clear water for use;

[0076] Dissolve 80g of acrylamide and 10g of 2-acrylamido-2-methylpropanesulfonic acid in 250g of clean water for later use;

[0077] Dissolve 1g of ammonium persulfate in 50g of water for later use;

[0078] 0.1 g of thioglycolic acid, dodecyldimethylallyl ammonium chloride solution, acrylamide and 2-acrylamido-2-methylpropanesulfonic acid solution were added to the reaction vessel and the temperature was raised to 60°C, then the The ammonium persulfate solution was added to the reaction system, the system was heated to 90°C for 1 hour, and the pH value of the solution was adjusted to 8 with NaOH to obtain a foam enhancer with an average molecular weight of 50,000 and a solid content of 20%.

Embodiment 2

[0079] The preparation of embodiment 2 wall protection agent

[0080] In a four-necked flask, add 15 g of acrylamide, 2.1 g of sodium dodecylbenzenesulfonate, and 205 g of distilled water, and stir to obtain an aqueous phase;

[0081] Dissolve 15.0 g of polystyrene foam and 2.1 g of octylphenol polyoxyethylene ether in 60.0 g of butyl methacrylate to obtain an organic phase;

[0082] The above organic phase was uniformly added dropwise to the aqueous phase within 30 min at 45 °C, emulsified at 600 rpm for 1 hour, and then heated to 60 °C. 2 After 30 minutes, 5 g of an aqueous solution containing 0.27 g of azobisisobutyramidine hydrochloride was added, and the reaction was stopped after 6 hours to obtain a wall-protecting agent.

Embodiment 3

[0083] Example 3 Preparation of Inhibitor

[0084] Dissolve 100g of acrylamide in 300g of water, stir evenly, add 50g of dimethylamine and react at room temperature for 2 hours, then heat up to 35°C, add 50g of epichlorohydrin to the reactor in batches, and heat the obtained solution to 60°C After the reaction was carried out for 1 hour, 10 mL of an aqueous solution containing 1.5 g of ammonium persulfate was added, and the temperature was raised to 90° C. and reacted for 0.5 hour to obtain an inhibitor.

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Abstract

The invention provides a microbubble drilling fluid, comprising: a base fluid; a treatment agent; the treatment agent includes: a foam enhancer and a wall-protecting agent. The key components of the micro-bubble drilling fluid provided by the present invention are the foam enhancer and the wall-protecting agent. The foam enhancer can synergize with the foaming agent, increase the wall thickness of the micro-bubble, improve the air core sealing performance in the micro-bubble, and enhance the The stability and compression resistance of microbubbles under high temperature and high pressure conditions; the wall protective agent can bond and form a film on the surface of the wellbore to seal the microfractures in the wellbore, thereby synergizing with the microbubbles and significantly improving the bearing capacity of the microbubble drilling fluid. It can improve the plugging performance and reduce the probability of drilling fluid leakage during drilling in low-pressure and leak-prone formations. The outstanding advantage of the microbubble drilling fluid provided by the invention lies in its good leak-proof properties, and is especially suitable for low-pressure and leak-prone formations.

Description

technical field [0001] The invention relates to the technical field of drilling fluids, in particular to a microbubble drilling fluid. Background technique [0002] At present, in the process of low-pressure or underbalanced drilling in domestic oilfields, foam drilling fluid is often used to reduce the density of the drilling fluid and ensure the safety of drilling operations. However, the conventional drilling fluid used in the prior art has a large foam particle size, which seriously affects the water feeding efficiency of the mud pump, and requires matching gas injection equipment (such as compressors, production and gas injection equipment, etc.), and the drilling cost is relatively high. Micro-foam drilling fluid is a kind of micro-foam with a diameter between 25 and 200 μm formed by surfactants and copolymers. It has low density, can be reused, and is not affected by MWD (measurement while drilling) and drilling fluid motors. It has the advantages of no need to add g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24C08F220/58C08F220/56C08F226/02C08F257/02C08F220/18
CPCC09K8/24C08F220/58C08F257/02
Inventor 谢建宇刘光成卢国林吴健王中华吕跃滨
Owner 中石化石油工程技术服务有限公司
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