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Use and maintenance method of micro-foam drilling fluid

A technology of drilling fluid and foam, which is applied in the field of use and maintenance of micro-foam drilling fluid, and can solve problems such as increased maintenance costs

Active Publication Date: 2021-03-09
CHINA UNITED COALBED METHANE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when drilling with the three-phase microfoam drilling fluid system, if the microfoam system has too high viscosity, it is necessary to adjust the rheology of the drilling fluid by adding dilute glue, which will increase the maintenance cost

Method used

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  • Use and maintenance method of micro-foam drilling fluid
  • Use and maintenance method of micro-foam drilling fluid
  • Use and maintenance method of micro-foam drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1.1 At first the dichloromethane solution (purity >99%) of 45mL, the potassium hydroxide (purity >99%) of 12.5 parts by weight, the cetrimonium bromide (purity >99%) of 1.5 parts by weight are packed with In the three-neck flask of the tail gas absorption device and the reflux condenser. After heating to 30°C, add 17.5 parts by weight of bisphenol F (purity>99%), continue heating to 50°C, add 68.5 parts by weight of 4-bromo-1-butanol (purity>99%) ), and keep stirring continuously to make the reaction complete. After the reaction is completed, the system is cooled, and the reaction product is filtered and purified to obtain a diether alcohol intermediate. The reaction process is as follows.

[0063]

[0064] Under the condition of stirring, add the diether alcohol intermediate into a three-neck flask (equipped with HCl treatment device) containing 45mL of dichloromethane solution (purity >99%), and slowly add it dropwise to the system at 10°C 10.5 parts by weight of...

Embodiment 2

[0067] ① Weigh a certain amount of foam stabilizer and inhibitor into a mixing cup filled with 200mL of water, and add while stirring to ensure that the polymer is completely dispersed and dissolved. Then gradually add a certain quality of foaming agent into the mixing cup, and at the same time stir with a glass rod to ensure that the foaming agent is fully dissolved. Fix the stirring cup on the high-speed blender, and stir for 1 min at a speed of 11000r / min±300r / min; ②After the stirring is completed, immediately remove the stirring cup, pour all the foam fluid in it into a 1000mL measuring cylinder, and record the Start the stopwatch at the same time to record the defoaming time; ③Repeat step ①, pour an appropriate amount of the foam system into the mud cup to test the rheology of the multi-stage foam system, including Initial and final cut; ④ Pour an appropriate amount of foam fluid into the mud tank of the water loss meter and hang the tank on the multi-connected water los...

Embodiment 3

[0112] In field use and maintenance, with system formula: 0.1% ULIT-1 (embodiment 1)+0.2% lauryl dimethyl betaine+0.3% biopolymer XC+0.2% guar gum GHPG+1% lignite resin + 1% ammonium salt + 0.2% potassium polyacrylate as the benchmark, select a microfoam drilling fluid system with a stirring condition of 5000r / min for 30min, and a stirring base fluid volume of 300mL, and measure its plugging performance. The results are shown in Table 11. The analysis data shows that microfoam can effectively block the pore space formed by quartz sand with different meshes, and the plugging effect is good.

[0113] Table 11 Plugging test of multi-stage foam low-damage drilling fluid system on different meshes of quartz sand under different pressures

[0114]

[0115] Note: 5000r / min, 300mL, 30min

[0116] (2) Evaluation of reservoir protection effect of microfoam drilling fluid system

[0117] Coal rock cores from representative coal seams were selected to evaluate the reservoir protectio...

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Abstract

The invention provides a use and maintenance method of a micro-foam drilling fluid. The use and maintenance method comprises preparation of the micro-foam drilling fluid and performance maintenance ofthe drilling fluid. The preparation method of the micro-foam drilling fluid comprises the following steps: S1) drilling a cement plug by using original well slurry, and then replacing the cement plugwith fresh water; and S2) adding a filtrate reducer into the fresh water, then adding a foam stabilizer and an inhibitor, mixing and hydrating, adding a foaming agent when the funnel viscosity of thedrilling fluid reaches 70s, and adjusting the drilling fluid to the required density; wherein the filtrate reducer is lignite resin; the foaming agent is a sulfonate foaming agent shown in a formula(I) and an alkyl betaine surfactant; the foam stabilizer is a biological polymer and guanidine gum; and the inhibitor comprises ammonium salt and potassium polyacrylate. Compared with the prior art, the micro-foam drilling fluid prepared by the invention can avoid overlarge foam amount change amplitude in the drilling process, can also effectively control the solid phase content, can effectively prevent stratum instability, and is simple in formula and convenient to prepare and maintain.

Description

technical field [0001] The invention belongs to the technical field of coal bed gas exploitation, and in particular relates to a method for using and maintaining microfoam drilling fluid. Background technique [0002] Coalbed methane, commonly referred to as methane gas, mainly exists in coal seams in an adsorbed state, which is a major risk factor in coal seam mining and construction. However, coalbed methane is also a green and clean energy that can be directly used in urban pipeline networks. Residential or industrial fuel. my country is rich in coalbed methane resources, with a total amount of 36.8×10 12 m 3 , ranking third in the world. At present, my country is transforming from a country rich in coalbed methane resources to a country strong in coalbed methane development, which is of great significance to the exploration and development of coalbed methane. However, in the existing coalbed methane mining process, due to the fast drilling speed of the coal seam, the...

Claims

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Application Information

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IPC IPC(8): C09K8/12C09K8/035E21B21/06
CPCC09K8/12C09K8/035E21B21/068
Inventor 孙晗森马腾飞杨刚吴鹏张平高计县王德桂张红军李志勇余曦
Owner CHINA UNITED COALBED METHANE
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