CN101735794A

CN101735794A - Additive for improving wettability of pulverized coal

Info

Publication number: CN101735794A
Application number: CN200910229161A
Authority: CN
Inventors: 管保山; 梁利; 刘萍; 胥云; 王丽伟; 刘玉婷
Original assignee: 管保山
Priority date: 2009-12-14
Filing date: 2009-12-14
Publication date: 2010-06-16
Anticipated expiration: 2029-12-14
Also published as: CN101735794B

Abstract

The invention relates to an additive for improving the wettability of pulverized coal, which comprises the following components in percentage by weight: 15 to 40 percent of organic sulfoacid, 10 to 25 percent of fatty alcohol-polyoxyethylene ether, 14 to 35 percent of low-level fatty alcohol, 2 to 15 percent of ethanolamine and 31 to 53 percent of water. The additive is prepared by directly mixing the components at room temperature, can be directly added into liquid for the fracture reformation of coal-bed gas fields, and has mutual solubility with other additives and good compatibility, and is easy to disperse; and the using coal-bed temperature is between 0 and 80 DEG C, the using mass concentration of the additive is between 0.5 to 5 percent, and the additive effectively solves the problem of the effect of the output of the pulverized coal on the energy output of coal-bed gas wells, and promotes the high and stable yield of the coal-bed gas wells.

Description

A kind of additive that improves wettability of pulverized coal

Technical field

The present invention relates to be used for the chemical agent that transform in the gas field, coal seam, especially a kind of additive that improves wettability of pulverized coal.

Technical background

Coal dust is the fine particle that splits away off from the coal petrography surface, and the grain diameter variation range is bigger, does not wait to about 74 μ m from 1～2mm, and most of even thinner, the coal dust of piling up in pit shaft is thick.

The generation reason more complicated of coal dust, at first closely related with coal petrography character, the coal petrography nature difference is very big, cherry coal particularly, the easier fragmentation of its structure, the coal dust of formation is far away more than the primary structure coal; Secondly drilling tool grinding and fracturing propping agents polishing also are the major reasons that coal dust produces; The stressed condition change also may be to cause matrix of coal to break in addition, produces coal dust.

In the transformation process of gas field, coal seam, coal petrography breaks or split away off a large amount of coal dusts under the washing away of liquid, be easy to be brought into fissured end by liquid, and play ponding in the end, crack, this function influence the expansion of end, crack, force the crack to be changed its course and the coal seam of the other direction that breaks again, thereby cause fissured complexity, crooked irregular, and crack internal pressure (or ground construction pressure) is raise.

After coal bed gas well was constructed and put into operation, coal dust can go out along with the coal seam aquatic products.The crux that the coal dust output influences the coal bed gas well production capacity is mainly reflected in: the migration of (1) coal dust is directly stopped up coal seam natural fracture system or is stopped up proppant pack porosity, further reduces the coal seam rate of permeation, disturbs the ordinary production of coal-seam gas; In the situ production, show that the aquatic products amount obviously reduces, the coal-seam gas characteristics of desorb or few desorb hardly; (2) coal dust block pumps suction port causes valve to be not closed completely, and reduces the water pump effect significantly; (3) the trickle coal dust that enters pit shaft is piled up gradually, forms the thickness jelly and enters in the pump, very easily causes the holddown phenomenon, needs frequently to examine pump in process of production; (4) coal dust is easily piled up at bottom, coal seam pit shaft, very easily buries the pump phenomenon.

Therefore, coal dust is administered the major issue that has become in the cbm development process, rationally controls the key that the coal dust output becomes coal bed gas well stable high yield.

By retrieval, find three pieces of close documents, simply introduce below:

1, a kind of slurries additive agent and preparation method thereof (CN101550369), this additive is 8: 1: 1～1: 8: 1 composite forming by anion surfactant naphthalene sulfonic acidformaldehyde condensation product sodium salt, sulfonated lignin and nonionogenic tenside alkylphenol polyoxyethylene (methyl) acrylate by mass ratio.The present invention is applied to naphthalene sulfonic acidformaldehyde condensation product sodium salt, sulfonated lignin and alkylphenol polyoxyethylene (methyl) acrylate in the technology of preparing of coal water slurry, it is wide to coal adaptability, particularly at the coal of low metamorphic grade, when the ternary composite type additive reaches 0.1～1wt% of coal (butt) weight, can prepare the coal water slurry of coal dust content at 62～70wt%, this slurry has good flowability, lower apparent viscosity and good static stability.

2, a kind of composite coal-water fluid additive (CN1693429), this additive is a petroleum sulfonate surfactant, and main component is a monosulfonate, and disulfonate and polysulfonate are also arranged, also contain certain inorganic salt, be widely used at present and improve in the petroleum recovery technology.The present invention is applied to sulfonated petro-leum in the coal water slurry technology of preparing, when the sulfonated petro-leum consumption is 1～2wt% of butt coal amount, can be under the low-viscosity situation, make the coal water slurry that coal dust content is 60～65wt%, this slurry can leave standstill stable for a long time, satisfies the requirement of pumping, atomizing and stable burning simultaneously.

3, a kind of additive and application method thereof (CN101195773), aim to provide a kind of high-efficiency composite slurries additive agent and the application method in the coal water slurry preparation thereof, each component of additive is pressed following weight proportion relation mixed preparing: 45～85% sulfonated lignin; 5～25% naphthalenesulfonates; 5～25% polyoxyethylene superpolymer; 5～35% carbonate or vitriol; 0～4.5%pH value conditioning agent.Application method comprises the aqueous solution of aforesaid additive being made solid-state pulverulent mixture or being made into any concentration, adds then in the butt coal dust to stir.Slurries additive agent among the present invention is inexpensive efficient, and the finished product viscosity in aqueous coal slurries is low, concentration is high, rheological characteristics is good, good stability, and in addition, coal adaptability is good.According to the coal of different coals, slurries additive agent prescription and proportioning thereof that selection matches can be carried out suitable modification to ature of coal, can improve effects on slurry making to greatest extent, have optimized cost performance simultaneously.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art part, the additive that improves wettability of pulverized coal that uses in the modification liquid body of gas field, a kind of coal seam is provided, this additive efficiently solves the coal dust output and influences the crux of coal bed gas well production capacity, has advanced coal bed gas well stable high yield.

The object of the present invention is achieved like this:

A kind of additive that improves wettability of pulverized coal, it constitutes component and weight percent is respectively:

Organic sulfonic acid: 15%～40%;

Fatty alcohol-polyoxyethylene ether: 10%～25%;

Lower aliphatic alcohols: 14%～35%;

Thanomin: 2%～15%

Water: 31%～53%.

And described organic sulfonic acid is shown below:

R-SO3H，R＝C12-C18。

And described fatty alcohol-polyoxyethylene ether is shown below:

R-O-(CH ₂CH ₂O)n-H，R＝C12-C18，n＝6-10。

And described lower aliphatic alcohols is methyl alcohol, ethanol or propyl alcohol.

And described thanomin comprises Monoethanolamine MEA BASF, diethanolamine or trolamine.

Advantage of the present invention and positively effect are:

1, this additive is by organic sulfonic acid, fatty alcohol-polyoxyethylene ether, composite the forming of the pure and mild water of lower aliphatic, can improve the wettability of liquid to coal dust, effectively disperse coal dust, prevent the caking precipitation, make coal dust with the recovered water extraction, effectively improve the coal-seam gas flow conductivity, prevent that coal dust stops up the crack in the transformation process of coal seam, be mainly used in coal bed gas well fracturing reform and other workover treatment process.

2, the main component organic sulfonic acid of this additive has performances such as decontamination, moistening, foaming, emulsification, dispersion; Fatty alcohol-polyoxyethylene ether, good wet performance, performance such as cleans at emulsification preferably, dispersion; Lower aliphatic alcohols and thanomin, help improving the dispersing property of effective constituent, hydrophobic coal dust is evenly dispersed in the liquid, effectively prevented coal bed gas well in the water pumping gas production process because the broken tiny coal dust that forms of coal petrography is trapped in the end, crack, influence progress of fracture or stops up coal seam natural fracture system and the problem of the ordinary production of proppant pack porosity, reduction coal seam rate of permeation, interference coal-seam gas.

3, each component of the present invention is formed by directly mixing at normal temperatures, can directly join gas field, coal seam fracturing reform with in the liquid, dissolve each other with other additive, compatibleness is good, easily disperse, use 0 ℃～80 ℃ of coal seam temperature, additive functional quality concentration 0.5%～5%, efficiently solve the coal dust output and influence the crux of coal bed gas well production capacity, advanced coal bed gas well stable high yield.

Embodiment

Below in conjunction with embodiment, the present invention is further described, and following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.

Embodiment 1:

Dodecyl sodium sulfonate: fatty alcohol-polyoxyethylene ether: methyl alcohol: Monoethanolamine MEA BASF: water=18: 18: 24: 4: 38, be formed by directly mixing at normal temperatures.When the dispersion agent add-on was 1.5% (mass ratio) and 2% (mass ratio), the infusion discharge capacity was respectively 1ml/min and 2ml/min, and the pulverized coal flow output sees Table 1.

Pulverized coal flow output among table 1 embodiment 1

Discharge capacity ml/min	??2	??1	??2	??1	??2	??1	??2	??1
Discharge capacity ml/min	??2	??1	??2	??1	??2	??1	??2	??1	Dispersant dosage %	??0.5	??0.5	??1.5	??1.5	??2	??2	??4	??4
Pulverized coal flow output g	??0.71	??0.33	??2.54	??1.18	??2.81	??1.32	??3.01	??1.38	Dispersant dosage %	??0.5	??0.5	??1.5	??1.5	??2	??2	??4	??4

Embodiment 2:

Witco 1298 Soft Acid: fatty alcohol-polyoxyethylene ether: methyl alcohol: diethanolamine: water=23: 18: 20: 4: 35, be formed by directly mixing at normal temperatures.When the dispersion agent add-on was 1.5% (mass ratio) and 2% (mass ratio), the infusion discharge capacity was respectively 1ml/min and 2ml/min, and the pulverized coal flow output sees Table 2.

Pulverized coal flow output among table 2 embodiment 2

Discharge capacity ml/min

??2

??1

??2

??1

??2

??1

??2

??1

Dispersant dosage %

??0.5

??1.5

??2

??4

Pulverized coal flow output g

??0.88

??0.52

??2.73

??1.26

??3.02

??1.59

??3.19

??1.72

Embodiment 3:

Witco 1298 Soft Acid: fatty alcohol-polyoxyethylene ether: ethanol: trolamine: water=23: 15: 20: 9: 33, be formed by directly mixing at normal temperatures.When the dispersion agent add-on was 1.5% (mass ratio) and 2% (mass ratio), the infusion discharge capacity was respectively 1ml/min and 2ml/min, and the pulverized coal flow output sees Table 3.

Pulverized coal flow output among table 3 embodiment 3

Discharge capacity ml/min	??2	??1	??2	??1	??2	??1	??2	??1
Discharge capacity ml/min	??2	??1	??2	??1	??2	??1	??2	??1	Dispersant dosage %	??0.5	??0.5	??1.5	??1.5	??2	??2	??4	??4
Pulverized coal flow output g	??0.63	??0.42	??2.47	??1.08	??2.66	??1.15	??2.91	??1.47	Dispersant dosage %	??0.5	??0.5	??1.5	??1.5	??2	??2	??4	??4

The above-mentioned pulverized coal flow output of the present invention is to adopt flowing experiment to measure, detailed process is: coal dust is broken into certain particle size makes coal dust, coal dust and quartz sand are pressed into column with certain proportion under certain pressure---mould, allow the liquid that contains additive pass through mould with certain flow velocity, collect effluent, measure weight by coal dust in the mould effluent.

This additive mechanism of action of the present invention is as follows:

Additive can be adsorbed in the coal dust surface, forms the bilayer structure, and outer dispersion agent polar end and water have than strong affinity, have increased coal dust by the degree of water-wet, between the solid particulate because of electrostatic repulsion away from.Make system even, suspension property increases, and does not precipitate.

Claims

1. additive that improves wettability of pulverized coal is characterized in that: it constitutes component and weight percent is respectively:

Organic sulfonic acid: 15%～40%;

Fatty alcohol-polyoxyethylene ether: 10%～25%;

Lower aliphatic alcohols: 14%～35%;

Thanomin: 2%～15%

Water: 31%～53%.

2. the additive that improves wettability of pulverized coal according to claim 1 is characterized in that: described organic sulfonic acid is shown below:

R-SO3H，R＝C12-C18。

3. the additive that improves wettability of pulverized coal according to claim 1 is characterized in that: described fatty alcohol-polyoxyethylene ether is shown below:

R-O-(CH ₂CH ₂O)n-H，R＝C12-C18，n＝6-10。

4. the additive that improves wettability of pulverized coal according to claim 1 is characterized in that: described lower aliphatic alcohols is methyl alcohol, ethanol or propyl alcohol.

5. the additive that improves wettability of pulverized coal according to claim 1 is characterized in that: described thanomin comprises Monoethanolamine MEA BASF, diethanolamine or trolamine.