Micro-foam drilling fluid

A drilling fluid and microbubble technology, applied in the field of drilling fluids, can solve the problems of insufficient compression resistance, the need for further enhancement of leakage prevention, and the lack of a treatment agent for bonding and filming to seal micro-fractures on the well wall.

Active Publication Date: 2020-04-14
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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Examples

Experimental program
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Effect test

Embodiment 1

[0074] The preparation of embodiment 1 foam enhancer

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

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

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

[0078] Add 0.1 g of mercaptoacetic acid, dodecyldimethylallyl ammonium chloride solution, acrylamide and 2-acrylamido-2-methylpropanesulfonic acid solution into the reaction vessel and raise the temperature to 60°C, then place 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 protecting agent

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

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

[0082] At 45°C, evenly add the above organic phase to the water phase dropwise within 30 minutes, emulsify at 600rpm for 1 hour, then raise the temperature to 60°C, pass N 2 After 30 minutes, 5 g of aqueous solution containing 0.27 g of azobisisobutylamidine hydrochloride was added, and the reaction was stopped after 6 hours of reaction to obtain a wall-protecting agent.

Embodiment 3

[0083] The preparation of embodiment 3 inhibitors

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

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Abstract

The invention provides a micro-foam drilling fluid which comprises a base fluid and a treatment agent; the treating agent comprises a foam reinforcing agent and a wall protecting agent. The key components of the micro-foam drilling fluid provided by the invention are the foam reinforcing agent and the wall protecting agent, and the foam reinforcing agent and a foaming agent can generate a synergistic effect, so that the wall thickness of micro-bubbles is increased, the air core sealing property in the micro-bubbles is improved, and the stability and compression resistance of the micro-bubblesunder high-temperature and high-pressure conditions are enhanced; the wall protecting agent can be adhered to the surface of a well wall to form a film and seal micro-cracks of the well wall, so thatthe wall protecting agent and micro-bubbles generate a synergistic effect, the pressure-bearing plugging performance of the micro-foam drilling fluid is remarkably improved, and the drilling fluid leakage probability of the micro-foam drilling fluid in the drilling process of a low-pressure leaky stratum is reduced. The micro-foam drilling fluid d provided by the invention has the outstanding advantage of good leakage-proof property, and is especially suitable for low-pressure leaky stratums.

Description

technical field [0001] The invention relates to the technical field of drilling fluid, in particular to a microbubble drilling fluid. Background technique [0002] At present, in the process of low-pressure or underbalanced drilling in domestic oil fields, foam drilling fluid is often used to reduce the density of drilling fluid and ensure the safety of drilling construction. However, the ordinary drilling fluid foam used in the prior art has a large particle size, which seriously affects the water supply efficiency of the mud pump, and requires supporting gas injection equipment (such as compressors, production and gas injection equipment, etc.), and the drilling cost is high. Microfoam drilling fluid is a kind of microfoam with a diameter between 25 and 200 μm formed by surfactants and copolymers. It has low density, can be used repeatedly, and is not affected by MWD (measurement while drilling) and drilling fluid motors. The impact of other downhole tools, no need to add...

Claims

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Application Information

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Patent Type & Authority Applications(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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