CN108918327A - For the preferred new method of additive for drilling fluid used in coalbed coring - Google Patents
For the preferred new method of additive for drilling fluid used in coalbed coring Download PDFInfo
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Abstract
The present invention provides one kind for the preferred new method of additive for drilling fluid used in coalbed coring.This method passes through pretreated coal dust sample by obtaining, adsorption treatment is carried out by pretreated coal dust sample to above-mentioned using the Deal With Drilling Fluid agent solution prepared in advance, coal dust sample quality after obtaining adsorption treatment, desorption processing is carried out to the coal dust sample after adsorption treatment using water flooding, obtain desorption treated coal dust sample quality, according to above-mentioned pretreated coal dust sample quality, coal dust sample quality after adsorption treatment, the quality and additive for drilling fluid quality of desorption treated coal dust sample, additive for drilling fluid is obtained in coal petrography adsorption rate and additive for drilling fluid in coal petrography surface desorption rate, quantitative comparison additive for drilling fluid is realized in the absorption property and desorption performance on coal petrography surface, and then drill that additive for drilling fluid is preferred in recovery process and coal seam reservoirs protecting effect provides Appreciation gist for coal bed gas.
Description
Technical field
The present invention relates to additive for drilling fluid to evaluate optimization technique field, more particularly to a kind of for coalbed coring brill used
The preferred new method of well liquid inorganic agent.
Background technique
Since 21 century, world economy enters the new lead-time, and oil-gas resource demand is significantly increased.It faces
But relative deficiency, unconventional petroleum resources have become important connect for huge energy demand, conventional gas and oil Productivity Construction and production
For the energy.Natural gas increases year by year as a kind of clean energy resource, yield.China's coal bed gas resource is abundant, and widely distributed.Coal storage
The features such as layer has porosity low, and permeability is small, large specific surface area, gas storage capability is strong, as coal bed gas field scale probing is opened
Hair, coal seam reservoirs protection and stable yields are put the position to become increasingly conspicuous at one.But due to the hugger of coal seam reservoirs, the hair of cleat
It educates, keeps coal seam reservoirs capillary phenomenon prominent, there is great specific surface area, be easy absorption water and polymer.During drilling, bore
High molecular polymer inorganic agent in well liquid is easily adsorbed onto the coal seam reservoirs of hugger, joint and the development of microfissure height, will be to coal petrography
Permeability, desorption ability, reservoir productivity etc. generate extreme influence.Therefore, it is necessary to preferably during coal bed gas extraction to coal
The small additive for drilling fluid of influence of layer, thus preferably and coal seam reservoirs protection effect for additive for drilling fluid during coal bed gas drilling
Fruit provides Appreciation gist.
In the prior art due to can not quantitative comparison additive for drilling fluid coal petrography surface absorption property and desorption performance,
And then can not determine the influence that additive for drilling fluid generates coal seam reservoirs during coal bed gas extraction, ignore coalbed drilling fluid
The preferred important evaluation index of inorganic agent.
Summary of the invention
The present invention provides one kind for the preferred new method of additive for drilling fluid used in coalbed coring, to realize Deal With Drilling Fluid
Agent is in the adsorptivity on coal petrography surface and the quantitative comparison of desorption property, and then the inorganic agent for drilling fluid during coal bed gas drilling is excellent
Choosing provides Appreciation gist.
The present invention provides one kind for the preferred new method of additive for drilling fluid used in coalbed coring, including：
It obtains and passes through pretreated coal dust sample, and be filled in adsorption column, wherein the pretreated pulverized coal sample quality
Amount is N grams；
Adsorption treatment, drying are carried out to the pretreated coal dust sample using the Deal With Drilling Fluid agent solution prepared in advance
And obtain the coal dust sample quality after adsorption treatment, wherein the additive for drilling fluid quality in the Deal With Drilling Fluid agent solution
It is S grams, the coal dust sample quality after the adsorption treatment is M grams；
Desorption processing is carried out to the coal dust sample after the adsorption treatment using the water flooding prepared in advance, dries and obtains
Desorption treated coal dust sample quality, wherein treated that coal dust sample quality is L grams for the desorption；
According to after the pretreated coal dust sample quality, the adsorption treatment coal dust sample quality, at the desorption
The quality of coal dust sample after reason and the additive for drilling fluid quality, obtain the additive for drilling fluid on coal petrography surface
Adsorption rate and the additive for drilling fluid are in coal petrography surface desorption rate, wherein N, S, M, L are all larger than 0；
According to a variety of additive for drilling fluid in coal petrography adsorption rate and a variety of additive for drilling fluid in coal petrography
Surface desorption rate carries out the additive for drilling fluid preferred.
Further, pretreated coal dust sample is passed through in above-mentioned acquisition, including：
The coal petrography sample for obtaining coal seam reservoirs, by the coal petrography sample comminution, sieve takes the coal petrography sample of 80-100 mesh；
The coal petrography sample of the 80-100 mesh is impregnated into preset duration in the water flooding, obtains the coal petrography after impregnating
Sample；
Coal petrography sample after the immersion is subjected to drying and processing under the first preset condition, and is cooled to room temperature, is obtained
The pretreated coal dust sample.
Further, the coal petrography sample by after the immersion carries out drying and processing under the first preset condition, including：
The coal petrography sample after the immersion is dried 24 hours under the conditions of 105 DEG C ± 5 DEG C.
Further, the pretreated coal dust sample is adsorbed using the Deal With Drilling Fluid agent solution prepared in advance
Processing, dries and obtains the coal dust sample quality after adsorption treatment, including：
It pressurizes to the Deal With Drilling Fluid agent solution, the Deal With Drilling Fluid agent solution is made to pass through the pretreated coal dust
Sample, and the Deal With Drilling Fluid agent solution in drainage voids obtain the Deal With Drilling Fluid agent solution and pass through after adsorption column
Coal dust sample；
The Deal With Drilling Fluid agent solution is carried out under the second preset condition by the coal dust sample after the adsorption column
Drying and processing, and be cooled to room temperature, the coal dust sample quality after obtaining the adsorption treatment.
Further, described that the Deal With Drilling Fluid agent solution is pre- second by the coal dust sample after the adsorption column
If drying and processing is carried out under the conditions of, including：
Coal dust sample after 105 DEG C of ± 5 DEG C of conditions pass through the adsorption column to the Deal With Drilling Fluid agent solution is dried
24 hours.
Further, desorption processing is carried out to the coal dust sample after the adsorption treatment using water flooding, dries and obtains
Desorption treated coal dust sample quality, including：
It pressurizes to the water flooding, makes the water flooding by the coal dust sample after the adsorption treatment, and drainage voids
In the water flooding, obtain the water flooding and pass through the coal dust sample after the adsorption column；
The water flooding is subjected to drying and processing by the coal dust sample after the adsorption column under third preset condition, and
It is cooled to room temperature, obtains desorption treated the coal dust sample quality.
Further, the water flooding is dried under third preset condition by the coal dust sample after the adsorption column
Dry-cure, including：
Coal dust sample after 105 DEG C of ± 5 DEG C of conditions pass through the adsorption column to the water flooding is dried 24 hours.
Further, according to the coal dust sample quality after the pretreated coal dust sample quality, the adsorption treatment, institute
The quality and the additive for drilling fluid quality for stating desorption treated coal dust sample, obtain the additive for drilling fluid and exist
Coal petrography adsorption rate and the additive for drilling fluid in coal petrography surface desorption rate, including：
The additive for drilling fluid is in coal petrography adsorption rateWherein, N indicates the pretreated coal dust
Sample quality, M indicate that the coal dust sample quality after the adsorption treatment, S indicate the inorganic agent quality；
The additive for drilling fluid is in coal petrography surface desorption rateWherein, N indicates the pretreated coal dust
Sample quality, M indicate the coal dust sample quality after the adsorption treatment, and L indicates the desorption treated the matter of coal dust sample
Amount.
The present invention provides one kind for the preferred new method of additive for drilling fluid used in coalbed coring, is located by obtaining by pre-
The coal dust sample of reason is adsorbed to above-mentioned by pretreated coal dust sample using the Deal With Drilling Fluid agent solution prepared in advance
Processing, dries and obtains the coal dust sample quality after adsorption treatment, is carried out using water flooding to the coal dust sample after adsorption treatment
Desorption processing dries and obtains desorption treated coal dust sample quality, further, according to above-mentioned pretreated pulverized coal sample quality
The quality and additive for drilling fluid quality of amount, the coal dust sample quality after adsorption treatment, desorption treated coal dust sample,
Additive for drilling fluid is obtained in coal petrography adsorption rate and additive for drilling fluid in coal petrography surface desorption rate, realizes quantitative comparison
Adsorptivity and being desorbed property of the additive for drilling fluid on coal petrography surface, and then additive for drilling fluid in recovery process is drilled for coal bed gas
It is preferred that and coal seam reservoirs protecting effect offer Appreciation gist.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the process provided by the invention for the preferred new method embodiment one of additive for drilling fluid used in coalbed coring
Schematic diagram；
Fig. 2 is the process provided by the invention for the preferred new method embodiment two of additive for drilling fluid used in coalbed coring
Schematic diagram.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is the present invention
A part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Fig. 1 is the process provided by the invention for the preferred new method embodiment one of additive for drilling fluid used in coalbed coring
Schematic diagram, as shown in Figure 1, the method for the present embodiment may include：
S101, it obtains and passes through pretreated coal dust sample, and be filled in adsorption column.
It being capable of preferably simulated formation coal petrography apparent gap by pretreated coal dust sample, wherein above-mentioned pretreated
Coal dust sample quality is N grams, and N is greater than 0.
S102, above-mentioned pretreated coal dust sample is carried out at absorption using the Deal With Drilling Fluid agent solution prepared in advance
Reason, the coal dust sample quality after obtaining adsorption treatment.
Specifically, the additive for drilling fluid for being configured to meet preset concentration requirement using S grams of additive for drilling fluid in advance is molten
Liquid, and the pretreated coal dust sample got in S101 is adsorbed using the Deal With Drilling Fluid agent solution prepared in advance
Processing makes to adsorb the Deal With Drilling Fluid agent molecule in Deal With Drilling Fluid agent solution by pretreated coal dust sample, carry out later
Drying, to obtain the coal dust sample after adsorption treatment, wherein the coal dust sample quality after adsorption treatment is M grams, and M is greater than 0.
Wherein, additive for drilling fluid is generally high molecular polymer, such as the polymer drilling well used in drilling process
The coating inhibitor of liquid is high molecular polymer.
S103, desorption processing is carried out to the coal dust sample after the adsorption treatment using water flooding, dries and obtains desorption
Treated coal dust sample quality.
Wherein, there are many modes for obtaining water flooding, and subsurface formations water can be directly acquired during drilling, can also be with
Simulated formation aqueous solution identical with leading ion ingredient in true water flooding is prepared, it is right before configuring simulated formation aqueous solution
The carry out constituent analysis of water flooding, the method for constituent analysis with it is similar in the prior art, the present invention to obtain water flooding mode
Without limitation.
Further, desorption processing is carried out to the coal dust sample after above-mentioned adsorption treatment using water flooding, is dried later,
To obtain desorption treated coal dust sample, wherein treated that coal dust sample quality is L grams for desorption, and L is greater than 0.
S104, according to after above-mentioned pretreated coal dust sample quality, adsorption treatment coal dust sample quality, desorption processing after
Coal dust sample quality and additive for drilling fluid quality, obtain additive for drilling fluid in coal petrography adsorption rate and drilling fluid
Inorganic agent is in coal petrography surface desorption rate.
Wherein, M grams of coal dust sample quality after N grams of pretreated quality of pc, adsorption treatment, desorption treated coal dust
L grams of sample quality and S grams of additive for drilling fluid quality used, according to the matter of the coal dust sample after different disposal
Amount obtains desorption rate of the additive for drilling fluid in coal petrography adsorption rate and additive for drilling fluid on coal petrography surface.
S105, existed according to a variety of additive for drilling fluid in coal petrography adsorption rate and a variety of additive for drilling fluid
Coal petrography surface desorption rate carries out the additive for drilling fluid preferred.
Specifically, according to different additive for drilling fluid in coal petrography adsorption rate and different additive for drilling fluid in coal petrography
Surface desorption rate, preferably adsorption rate are smaller, and the biggish additive for drilling fluid of desorption rate is as optimal additive for drilling fluid.
It is provided in this embodiment to be directed to the preferred new method of additive for drilling fluid used in coalbed coring, by obtaining by pre- place
The coal dust sample of reason is adsorbed to above-mentioned by pretreated coal dust sample using the Deal With Drilling Fluid agent solution prepared in advance
Processing, dries and obtains the coal dust sample quality after adsorption treatment, is carried out using water flooding to the coal dust sample after adsorption treatment
Desorption processing dries and obtains desorption treated coal dust sample quality, further, according to above-mentioned pretreated pulverized coal sample quality
Amount, the coal dust sample quality after adsorption treatment, desorption treated coal dust sample quality and additive for drilling fluid quality, obtain
Additive for drilling fluid, in coal petrography surface desorption rate, realizes quantitative comparison drilling well in coal petrography adsorption rate and additive for drilling fluid
Adsorptivity and being desorbed property of the inorganic agent on coal petrography surface in liquid, and then preferably mentioned for additive for drilling fluid in coal bed gas drilling process
For Appreciation gist.
Fig. 2 is the process provided by the invention for the preferred new method embodiment two of additive for drilling fluid used in coalbed coring
Schematic diagram, as shown in Fig. 2, the method for the present embodiment may include：
S201, the coal petrography sample for obtaining coal seam reservoirs, by coal petrography sample comminution, sieve takes the coal petrography sample of 80-100 mesh, will
The coal petrography sample of above-mentioned 80-100 mesh impregnates preset duration in water flooding, the coal petrography sample after impregnating is obtained, by the leaching
Coal petrography sample after bubble carries out drying and processing under the first preset condition, and is cooled to room temperature, and obtains the pretreated coal dust
Sample, and the pretreated coal dust sample is filled in adsorption column.
A kind of optionally implementation, take coal seam reservoirs rock core or on return landwaste as coal petrography sample, coal petrography sample is carried out
It crushes, and sub-sieve is carried out to smashed coal dust sample using the sieve of 80-100 sieve mesh under U.S.'s taylor criteria, obtain and meet
The coal petrography sample of 80-100 mesh.
It should be noted that the sieve of selection 80-100 sieve mesh handles smashed coal petrography sample, it is to obtain
The suitable coal petrography sample of granular size is got, if coal petrography sample particle is larger, the surface area for absorption is smaller, to polyphosphazene polymer
Absorption and the desorption phenomenon for closing object are unobvious, if coal petrography sample particle is smaller, when carrying out adsorption treatment and desorption is handled, and drilling well
Liquid processing agent solution and water flooding are not easy to pass through from adsorption column, can not be truly reflected Deal With Drilling Fluid agent molecule in coal petrography table
The adsorptivity and desorption property in face.It is of course also possible to the sieve of other suitable grit numbers is selected to be screened according to the actual situation,
Which is not limited by the present invention.
Further, the coal petrography sample of 80-100 mesh is placed in water flooding and is impregnated 7 days, to simulate underground condition pair
Coal petrography sample surfaces are soaked, and then impregnate 7 days coal petrography samples in water flooding to above-mentioned under the conditions of 105 DEG C ± 5 DEG C
Drying 24 hours, and be cooled to room temperature, to obtain pretreated coal dust sample, and pretreated coal dust sample is filled in absorption
In column.Wherein, above-mentioned pretreated coal dust sample quality is N grams, and N is greater than 0.
That is directly N grams of pretreatment coal dust sample can be filled in adsorption column.
Another implementation of choosing can obtain absorption before pretreated coal dust sample is filled in adsorption column
The actual mass of column, after pretreated coal dust sample is filled in adsorption column, acquisition is filled with pretreated coal dust sample
Adsorption column quality, the actual mass of adsorption column is subtracted by being filled with the quality of adsorption column of pretreated coal dust sample,
Obtain the quality of pretreated coal dust sample.
Due to execute load operation during can be lossy, thus the absorption to additive for drilling fluid on coal petrography surface
Property had an impact with the evaluation result of desorption property, pretreated coal dust sample quality is obtained using aforesaid way, number can be reduced
According to error, keep evaluation result more accurate.
S202, make the Deal With Drilling Fluid agent solution by described pretreated to Deal With Drilling Fluid agent solution pressurization
Coal dust sample, and the Deal With Drilling Fluid agent solution in drainage voids, obtain the Deal With Drilling Fluid agent solution and pass through absorption
Coal dust sample after column；By the Deal With Drilling Fluid agent solution by the coal dust sample after adsorption column under the second preset condition into
Row drying and processing, and be cooled to room temperature, the coal dust sample quality after obtaining the adsorption treatment.
Specifically, it pressurizes to Deal With Drilling Fluid agent solution, Deal With Drilling Fluid agent solution is made all to pass through pretreated coal dust
Sample, pretreated coal dust sample adsorb the high molecular polymer in Deal With Drilling Fluid agent solution, the above-mentioned brill in drainage voids
Well liquid handles agent solution, it is ensured that Deal With Drilling Fluid agent solution does not remain in corresponding system, to obtain Deal With Drilling Fluid
Agent solution passes through the coal dust sample after adsorption column.
Deal With Drilling Fluid agent solution is subjected to drying and processing by the coal dust sample after adsorption column under the second preset condition,
A kind of optionally implementation, the pulverized coal sample after 105 DEG C of ± 5 DEG C of conditions pass through adsorption column to above-mentioned Deal With Drilling Fluid agent solution
Product are dried 24 hours, are then cooled to room temperature, the coal dust sample after obtaining adsorption treatment.
Pretreated coal dust sample quality is obtained in the mode and S201 of coal dust sample quality after obtaining adsorption treatment
Mode is identical, obtains the quality for being filled with the adsorption column of the coal dust sample after adsorption treatment first, then by being filled with absorption
The quality of the adsorption column of treated coal dust sample subtracts the mode of the actual mass of adsorption column, the coal dust after obtaining adsorption treatment
Sample quality, wherein the coal dust sample quality after adsorption treatment is M grams, and M is greater than 0.
It should be noted that the mode of the coal dust sample quality after adsorption treatment is obtained in the present embodiment, without that will adsorb
Treated coal dust sample reduces operating procedure, after improving from taking out and being refilled by adsorption column in adsorption column
Accuracy of the follow-up hole liquid inorganic agent in the adsorptivity and desorption property calculated result on coal petrography surface.
S203, make the water flooding by the coal dust sample after the adsorption treatment to water flooding pressurization, and drain
The water flooding in gap obtains the water flooding and passes through the coal dust sample after adsorption column；The water flooding is passed through into absorption
Coal dust sample after column carries out drying and processing under third preset condition, and is cooled to room temperature, and obtaining the desorption, treated
Coal dust sample quality.
Specifically, it pressurizes to water flooding, the coal dust sample after making water flooding all pass through adsorption treatment, and drainage voids
In above-mentioned water flooding, it is ensured that water flooding does not remain in corresponding system, to obtain water flooding by after adsorption column
Coal dust sample.
Water flooding is subjected to drying and processing by the coal dust sample after adsorption column under third preset condition, it is optionally a kind of
Implementation, the coal dust sample after 105 DEG C of ± 5 DEG C of conditions pass through adsorption column to above-mentioned water flooding is dried 24 hours, then cold
But to room temperature, desorption is obtained treated coal dust sample.
It obtains in the mode and S202 of desorption treated coal dust sample quality and obtains the pulverized coal sample quality after adsorption treatment
The mode of amount is identical, the quality for being filled with the adsorption column of desorption treated coal dust sample is obtained first, then by being filled with
The quality of the adsorption column of desorption treated coal dust sample subtracts the mode of the actual mass of adsorption column, and obtaining desorption, treated
Coal dust sample quality, wherein desorption treated coal dust sample quality is L grams, and L is greater than 0.
It should be noted that the mode of desorption treated coal dust sample quality is obtained in the present embodiment, without that will be desorbed
Treated, and coal dust sample takes out from adsorption column, reduces operating procedure, improves subsequent well liquid inorganic agent in coal petrography table
The accuracy of the adsorptivity and desorption property calculated result in face.
S204, according to the coal dust sample quality, described de- after the pretreated coal dust sample quality, the adsorption treatment
The quality and the additive for drilling fluid quality of attached treated coal dust sample obtain additive for drilling fluid on coal petrography surface
Adsorption rate and additive for drilling fluid are in coal petrography surface desorption rate.
Optionally in a kind of implementation, additive for drilling fluid is in coal petrography adsorption rateWherein, N table
Show that the pretreated coal dust sample quality, M indicate that the coal dust sample quality after the adsorption treatment, S indicate the inorganic agent
Quality；
After desorption processing, additive for drilling fluid is in coal petrography surface desorption rateWherein, N indicates the pre- place
The coal dust sample quality of reason, M indicate the coal dust sample quality after the adsorption treatment, and L indicates the desorption treated coal dust
The quality of sample.
Additive for drilling fluid can be obtained in the absorption property and desorption performance on coal petrography surface by the calculating of above-mentioned 2 formula.
It should be noted that can also be by other calculation methods, after pretreated coal dust sample quality, adsorption treatment
Coal dust sample quality, desorption treated coal dust sample quality and the acquisition of additive for drilling fluid quality be able to reflect drilling well
Other characteristic parameters of liquid inorganic agent in coal petrography adsorption and desorption property.
It should be noted that coal dust sample quality after the pretreated coal dust sample quality of above-mentioned acquisition, adsorption treatment,
When the quality of desorption treated coal dust sample, the quality of adsorption column can also be set as unknown number, for example, it is assumed that adsorption column
Quality is Q, and Q is greater than 0.According to basic mathematical knowledge, pretreated coal dust sample quality is equal to and is filled with pretreated coal
Powder sample quality, which subtracts the coal dust sample quality after the quality of adsorption column, adsorption treatment and is equal to, is filled with the coal dust after adsorption treatment
Sample quality subtracts the quality of adsorption column, desorption treated coal dust sample quality is equal to and is filled with desorption treated pulverized coal sample
Quality subtracts the quality of adsorption column, substitutes into two formula in step S204, and carries out to two calculation formula in S204
Simplify it is found that the quality of adsorption column can also calculate additive for drilling fluid in coal petrography according to above-mentioned two formula when being unknown number
The desorption rate of the adsorption rate on surface and additive for drilling fluid on coal petrography surface.
It is assumed to be unknown number according to the actual mass of adsorption column or by the quality of adsorption column, to obtain pretreated coal
Coal dust sample quality after powder sample quality, adsorption treatment, desorption treated coal dust sample quality, can be selected according to demand
It selects, which is not limited by the present invention.
S205, existed according to a variety of additive for drilling fluid in coal petrography adsorption rate and a variety of additive for drilling fluid
Coal petrography surface desorption rate carries out the additive for drilling fluid preferred.
Specifically, according to different additive for drilling fluid in coal petrography adsorption rate and different additive for drilling fluid in coal petrography
Surface desorption rate, preferably adsorption rate are smaller, and the biggish additive for drilling fluid of desorption rate is as optimal additive for drilling fluid.
It is provided in this embodiment to be directed to the preferred new method of additive for drilling fluid used in coalbed coring, pass through and obtains coal seam reservoirs
Coal petrography sample, by the coal petrography sample comminution, sieve takes the coal petrography sample for meeting 80-100 mesh, by the coal of above-mentioned 80-100 mesh
Rock sample product impregnate preset duration in water flooding, obtain the coal petrography sample after impregnating, by the coal petrography sample after the immersion the
Drying and processing is carried out under one preset condition, and is cooled to room temperature, and obtains the pretreated coal dust sample, and be filled in adsorption column
In, then, so that the Deal With Drilling Fluid agent solution is passed through the pretreated coal dust sample to the pressurization of Deal With Drilling Fluid agent solution,
And the Deal With Drilling Fluid agent solution in drainage voids, it obtains Deal With Drilling Fluid agent solution and passes through the coal dust sample after adsorption column, it will
The Deal With Drilling Fluid agent solution carries out drying and processing by the coal dust sample after adsorption column under the second preset condition, and cooling
To room temperature, coal dust sample quality after obtaining the adsorption treatment makes the water flooding pass through the absorption to water flooding pressurization
Treated coal dust sample, and the water flooding in drainage voids, obtain water flooding by the coal dust sample after adsorption column, will
The water flooding carries out drying and processing by the coal dust sample after adsorption column under third preset condition, and is cooled to room temperature, and obtains
Desorption treated the coal dust sample quality is taken, after the pretreated coal dust sample quality, the adsorption treatment
The quality and additive for drilling fluid quality of coal dust sample quality, desorption treated the coal dust sample, obtain at drilling fluid
Agent is managed in coal petrography adsorption rate and additive for drilling fluid in coal petrography surface desorption rate.By selecting the suitable coal dust of granular size
Sample, and being calculated according to above-mentioned formula, quantitatively reflect additive for drilling fluid in the absorption property and desorption performance on coal petrography surface,
And then can determine the influence that additive for drilling fluid generates coal petrography performance, to drill drilling fluid in recovery process for coal bed gas
Inorganic agent preferably provides data support and coal seam reservoirs protecting effect provides Appreciation gist.
Below with a specific embodiment to provided by the invention preferably new square for additive for drilling fluid used in coalbed coring
Method is described in detail.
The present embodiment is mainly used for preferred natural polymer fluid loss additive WNP-2 and carboxymethyl starch CMS., specifically include
Following steps：
Firstly, obtaining the coal petrography sample in the coal seam Seam Gas In East Yunnan And West Guizhou field courtyard block 8#, coal petrography sample is crushed,
Sieve takes the coal petrography sample for meeting 80-100 mesh, the coal petrography sample of 80-100 mesh is impregnated 7 days in water flooding, after immersion
Coal petrography sample dried 24 hours under the conditions of 105 DEG C ± 5 DEG C, the pre- place that obtains pretreated coal dust sample, and will acquire
The coal dust sample of reason is filled in adsorption column.Wherein, the adsorption column quality for being filled with pretreated coal dust sample is 135.6571
Gram.
Then, it pressurizes to natural polymer fluid loss additive WNP-2 solution, makes natural polymer fluid loss additive WNP-2 solution
Natural polymer fluid loss additive WNP-2 solution into adsorption column, and in drainage voids, natural polymer fluid loss additive WNP-
When 2 solution pass through adsorption column, the pretreated coal dust sample absorption natural polymer fluid loss additive molecule placed in adsorption column, it
It is dried 24 hours under the conditions of 105 DEG C ± 5 DEG C afterwards, to get the coal dust sample after adsorption treatment, wherein be filled with absorption
The adsorption column quality of treated coal dust sample is 135.8026 grams.
It should be noted that the natural polymer fluid loss additive WNP-2 solution prepared in advance is by 500 milliliters of water, 10 grams
Natural polymer fluid loss additive WNP-2 is configured to the natural polymer fluid loss additive WNP-2 solution that concentration is 2%.
Further, the water flooding to 500 milliliters is pressurizeed, and enters water flooding in adsorption column, and the ground in drainage voids
Layer water, when water flooding passes through adsorption column, water flooding carries out sufficient desorption processing, Zhi Hou to the coal dust sample after adsorption treatment
It is dried 24 hours under the conditions of 105 DEG C ± 5 DEG C, to get desorption treated coal dust sample, wherein be filled with desorption processing
The adsorption column quality of coal dust sample afterwards is 135.7877 grams.
Wherein it is possible to assume that the quality of adsorption column is unknown number Q, Q is greater than 0, then N=135.6571-Q, M=
135.8026-Q L=135.7877-Q, S=10.0.
Optionally in another implementation, before pretreated coal dust sample can be loaded in adsorption column, obtains and inhale
The actual mass of attached column.It is subtracted after performing above-mentioned steps by being filled with the adsorption column quality of pretreated coal dust sample
The quality of adsorption column obtains pretreated coal dust sample quality, correspondingly, by being filled with the coal dust sample after adsorption treatment
The quality that adsorption column quality subtracts adsorption column obtains the coal dust sample quality after adsorption treatment, and by being filled with desorption, treated
The quality that the adsorption column quality of coal dust sample subtracts adsorption column obtains desorption treated coal dust sample quality.
Further, natural polymer fluid loss additive WNP-2 is obtained in coal petrography sample surfaces according to following two formula
The desorption rate of adsorption rate and natural polymer fluid loss additive WNP-2 in coal petrography sample surfaces.
Specifically, adsorption rate of the natural polymer fluid loss additive WNP-2 in coal petrography sample surfacesWherein, N
Indicate that pretreated coal dust sample quality, M indicate that the coal dust sample quality after adsorption treatment, S indicate natural polymer filtrate reducing
Agent WNP-2 mass.
Desorption rate of the natural polymer fluid loss additive WNP-2 in coal petrography sample surfacesWherein, N indicates pre-
The coal dust sample quality of processing, M indicate that the coal dust sample quality after adsorption treatment, L indicate desorption treated pulverized coal sample quality
Amount.
Natural polymer fluid loss additive WNP-2 is substituted for carboxymethyl starch CMS, and is repeated the above steps, carboxylic first is obtained
Base starch CMS coal petrography surface adsorption rate and carboxymethyl starch CMS coal petrography surface desorption rate.It is obtained according to above-mentioned steps
To following as a result, as shown in table 1：
Wherein, adsorption rate refers to natural polymer fluid loss additive WNP-2 or carboxymethyl starch CMS on coal petrography surface in table 1
Adsorption rate, desorption rate refers to natural polymer fluid loss additive WNP-2 or carboxymethyl starch CMS in the desorption rate on coal petrography surface.
As can be seen from the above data, natural polymer fluid loss additive WNP-2 is larger in coal petrography surface excess, desorption rate
It is smaller, and adsorbance of the carboxymethyl starch CMS on coal petrography surface is smaller, desorption rate is larger, accordingly, it is preferred that carboxymethyl starch
CMS can reduce additive for drilling fluid in the absorption on coal petrography surface as fluid loss additive.
Claims (8)
1. one kind is for the preferred new method of additive for drilling fluid used in coalbed coring, which is characterized in that including：
It obtains and passes through pretreated coal dust sample, and be filled in adsorption column, wherein the pretreated coal dust sample quality is
N grams；
Adsorption treatment is carried out to the pretreated coal dust sample using the Deal With Drilling Fluid agent solution prepared in advance, dries and obtains
Coal dust sample quality after taking adsorption treatment, wherein the additive for drilling fluid quality in the Deal With Drilling Fluid agent solution is S
Gram, the coal dust sample quality after the adsorption treatment is M grams；
Desorption processing is carried out to the coal dust sample after the adsorption treatment using water flooding, dry and obtains desorption treated coal
Powder sample quality, wherein desorption treated the coal dust sample quality is L grams；
After being handled according to coal dust sample quality, the desorption after the pretreated coal dust sample quality, the adsorption treatment
Coal dust sample quality and the additive for drilling fluid quality, obtain the additive for drilling fluid in coal petrography adsorption rate
With the additive for drilling fluid in coal petrography surface desorption rate, wherein N, S, M, L are all larger than 0；
According to a variety of additive for drilling fluid in coal petrography adsorption rate and a variety of additive for drilling fluid on coal petrography surface
Desorption rate carries out the additive for drilling fluid preferred.
2. the method according to claim 1, wherein the acquisition pass through pretreated coal dust sample, including：
The coal petrography sample for obtaining coal seam reservoirs, by the coal petrography sample comminution, sieve takes the coal petrography sample of 80-100 mesh；
The coal petrography sample of the 80-100 mesh is impregnated into preset duration in the water flooding, obtains the coal petrography sample after impregnating
Product；
Coal petrography sample after the immersion is subjected to drying and processing under the first preset condition, and is cooled to room temperature, described in acquisition
Pretreated coal dust sample.
3. according to the method described in claim 2, it is characterized in that, the coal petrography sample by after the immersion is preset first
Under the conditions of carry out drying and processing, including：
The coal petrography sample after the immersion is dried 24 hours under the conditions of 105 DEG C ± 5 DEG C.
4. according to the method described in claim 3, it is characterized in that, described using the Deal With Drilling Fluid agent solution pair prepared in advance
The pretreated coal dust sample carries out adsorption treatment, dries and obtain the coal dust sample quality after adsorption treatment, including：
It pressurizes to the Deal With Drilling Fluid agent solution, the Deal With Drilling Fluid agent solution is made to pass through the pretreated pulverized coal sample
Product, and the Deal With Drilling Fluid agent solution in drainage voids obtain the Deal With Drilling Fluid agent solution and pass through the adsorption column
Coal dust sample afterwards；
The Deal With Drilling Fluid agent solution is dried under the second preset condition by the coal dust sample after the adsorption column
Processing, and be cooled to room temperature, the coal dust sample quality after obtaining the adsorption treatment.
5. according to the method described in claim 4, it is characterized in that, the Deal With Drilling Fluid agent solution is passed through the adsorption column
Coal dust sample afterwards carries out drying and processing under the second preset condition, including：
Coal dust sample drying 24 after 105 DEG C of ± 5 DEG C of conditions pass through the adsorption column to the Deal With Drilling Fluid agent solution is small
When.
6. according to the method described in claim 5, it is characterized in that, it is described using water flooding to the coal dust after the adsorption treatment
Sample carries out desorption processing, dries and obtain desorption treated coal dust sample quality, including：
It pressurizes to the water flooding, makes the water flooding by the coal dust sample after the adsorption treatment, and in drainage voids
The water flooding obtains the water flooding and passes through the coal dust sample after the adsorption column；
The water flooding is subjected to drying and processing by the coal dust sample after the adsorption column under third preset condition, and cooling
To room temperature, the desorption is obtained treated coal dust sample quality.
7. according to the method described in claim 6, it is characterized in that, described pass through the coal after the adsorption column for the water flooding
Powder sample carries out drying and processing under third preset condition, including：
Coal dust sample after 105 DEG C of ± 5 DEG C of conditions pass through the adsorption column to the water flooding is dried 24 hours.
8. method according to claim 1-7, which is characterized in that according to the pretreated pulverized coal sample quality
At amount, the coal dust sample quality after the adsorption treatment, the desorption treated coal dust sample quality and the drilling fluid
Agent quality is managed, obtains the additive for drilling fluid in coal petrography adsorption rate and the additive for drilling fluid in coal petrography surface desorption
Rate, including：
The additive for drilling fluid is in coal petrography adsorption rateWherein, N indicates the pretreated coal dust sample
Quality, M indicate that the coal dust sample quality after the adsorption treatment, S indicate the additive for drilling fluid quality；
The additive for drilling fluid is in coal petrography surface desorption rateWherein, N indicates the pretreated coal dust sample
Quality, M indicate the coal dust sample quality after the adsorption treatment, and L indicates the desorption treated the quality of coal dust sample.
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