CN104483455A - Drilling fluid protecting coal seam capacity experimental evaluation method - Google Patents
Drilling fluid protecting coal seam capacity experimental evaluation method Download PDFInfo
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Abstract
A drilling fluid protecting coal seam capacity experimental evaluation method comprises a coal seam gas desorption capacity recovering experimental evaluation method, a permeability recovering experimental evaluation method and a drilling fluid protecting coal seam capacity judging method. According to the method, the protecting capacity on a coal seam from drilling fluid can be effectively evaluated, the fact that after the drilling fluid enters the coal seam, the reservoir in-situ seepage capacity and desorption capacity can be well kept, coal seam gas damage is avoided, and coal seam gas exploration and development comprehensive benefits are improved.
Description
Technical field
The present invention relates to a kind of evaluation method of drilling fluid coal seam protective capability in drilling process, be applicable to evaluate the coalbed drilling fluids such as straight well, horizontal well, multi-branched horizontal well and U-shaped well to the protective capability in coal seam.
Background technology
Coal-seam gas is a kind of unconventional resource gas, coexists with the form of free state and ADSORPTION STATE, and this just proposes challenge to the evaluation method of the protection of appraisal drilling liquid in the past reservoir ability and index.Protection coal seam must be protected the percolation ability in coal seam and coal-seam gas desorption ability; because only have desorption ability protected; later stage just has coal-seam gas endlessly can for exploitation; and the reservoir of appraisal drilling liquid protection in the past ability all only considers the percolation ability of its protection reservoir; therefore classic method can not effective evaluation drilling fluid to the protective capability of coal-seam gas, must improvement and bring new ideas be carried out.
Summary of the invention
The object of the invention is to the deficiency overcoming above-mentioned existing evaluation method, there is provided a kind of practical can the better method of appraisal drilling liquid protection coal seam ability and index, the following outstanding advantages of the method tool: (1) experimental technique can the percolation ability in appraisal drilling liquid protection coal seam and desorption ability; (2) experimental technique is simple, practical, effective.
The technical scheme that the present invention solves the problems of the technologies described above employing is: a kind of drilling fluid protecting coal seam capacity experimental evaluation method; comprise coal-seam gas desorption ability and recover experimental evaluation method, resume permeability experimental evaluation method and drilling fluid protecting coal seam ability decision method, wherein:
coal-seam gas desorption ability recovers experimental evaluation method and comprises the steps:
A) coal sample prepares: choose coal grain between 60 ~ 80 mesh sieves, loads in sample pot, and by canned full compacting during tinning, weighing and recording loads sample pot coal grain quality, coal sample adds a cover absorbent cotton, sealed sample tank;
B) coal sample vacuum outgas: open constant temperature system, vacuum pump, setting constant temperature system temperature is 60 ± 1 DEG C, opens
Sample pot valve, carries out vacuum outgas to coal sample, until pressure sensor monitoring pressure display-0.1MPa reaches 2 hours, stops degassed;
C) coal sample adsorbed methane: after degassed end, adjustment constant temperature system temperature is experimental temperature; Open high pressure methane gas cylinder valve and gas injection tank valve, high pressure methane gas cylinder is communicated with gas injection tank, buffering enters the gaseous tension of sample pot, treats that gas injection tank gaseous tension is 1.0 ~ 1.4 times of sample pot coal sample Ideal adsorption equalized pressure, closes high pressure methane gas cylinder valve; Open the valve connecting sample pot and gas injection tank, by gas injection tank, sample pot is inflated, until reach adsorption equilibrium state;
D) coal sample pollutes front desorption behavior mensuration:
D1) from sample is filled with, fast take out sample and to soak in clear water 0.5 ~ 1 minute;
D2) take out sample, again insert in sample filling, pitch prill clear water, closes pitch prill valve;
D3) get out Chronograph, vacuum sampler and desorption instrument, measure and record temperature and air pressure, respectively vacuum sampler and desorption instrument being connected, then close the valve between sample pot and gasing tank;
D4) first open the valve connecting vacuum sampler, make the free methane in sample pot be introduced into vacuum sampler, when the force value of sample pot is zero, close rapidly the valve connecting vacuum sampler, open the valve connecting desorption instrument, open starter gear; Now, instrument automatically reads and records methane desorption quantity Qoi and corresponding time toi; The methane desorption quantity increment recorded when adjacent writing time is less than 2%, closes all appts;
E) coal sample pollutes rear desorption behavior mensuration:
Repeat step a) ~ c), from sample is filled with, fast take out sample and in drilling fluid after immersing degraded 0.5 ~ 1 minute, then according to steps d 2) ~ d4), obtain twi writing time polluting rear methane desorption quantity Qwi and correspondence;
F) methane desorption quantity is than the mensuration of Jxi:
In formula (1):
Qoi: coal sample pollutes front methane desorption quantity, and unit is ml/g;
Qwi: coal sample pollutes rear methane desorption quantity, and unit is ml/g;
resume permeability experimental evaluation method comprises the steps:
A) coal sample original permeability measures:
Choose the coal stem 1 piece with relative two end faces, two end faces are denoted as A, B respectively, vacuumize more than 8 hours, then use the saturated coal stem of 3%KCl solution; Then High Temperature High Pressure unblocking instrument is adopted, under confined pressure 3 ~ 5MPa condition, use 3%KCl solution, flow within the scope of pressure at 0.3 ~ 3MPa, the permeability that KCl solution flows into from A end face, B end face flows out survey coal sample is made respectively with multiple spot pressure forward, maximal value is called pollutes front coal sample original permeability Koi, and the stream pressure Poi that record is corresponding;
B) coal sample pollutes rear permeability determination:
B1) drilling fluid contamination coal sample end face: adopt High Temperature High Pressure de-plugging to evaluate instrument, at confined pressure 5MPa, under flowing pressure 3.5MPa, with the tangential cyclic polluting of drilling fluid above-mentioned coal stem B end face 1 hour;
B2) degraded coal sample end face drilling fluid: keep confined pressure constant, coal sample is airtight in High Temperature High Pressure de-plugging evaluation instrument to be deposited to drilling fluid degradation rate >=85%;
B3) the rear permeability of pollution is measured: under confined pressure 3 ~ 5MPa condition, use 3%KCl solution, flow within the scope of pressure at 0.3 ~ 3MPa, the permeability that KCl solution flows into from A end face, B end face flows out survey coal sample is made respectively with multiple spot pressure forward, maximal value is called pollutes rear coal sample permeability Kfi, and the stream pressure Pfi that record is corresponding;
C) mensuration of permeability resume figure Sti:
In formula (2):
Koi: coal sample original permeability before polluting, unit is millidarcy;
Kfi: coal sample permeability after polluting, unit is millidarcy;
drilling fluid protecting coal seam ability decision method:
When Jxi≤30% and/or Sti≤30%, it is poor that coal seam protected effect is judged to be; When 30% < Jxi≤50% and Sti > 30%, or 30% < Sti≤50% and Jxi > 30% time, coal seam protected effect is judged to be poor; When 50% < Jxi≤70% and Sti > 50%, or 50% < Sti≤70% and Jxi > 50% time, coal seam protected effect is judged to be generally; When 70% < Jxi≤85% and Sti > 70%, or 70% < Sti≤85% and Jxi > 70% time, coal seam protected effect is judged to be better; As Jxi > 85% and Sti > 85% time, coal seam protected effect is judged to be fabulous.
In resume permeability experimental evaluation method, step a) and step b3) in stream pressure adopt following spot pressure respectively: 0.3MPa, 0.5MPa, 1MPa, 1.5MPa, 2MPa, 2.5MPa, 3MPa.
Above Judging index shows; drilling fluid protecting coal seam ability Judging index adopts just low just not high principle; namely when desorption quantity is than when belonging to same level with permeability resume figure index, coal seam protected effect just can be judged to be this level, otherwise protected effect presses low level judgement.Such as, when behind drilling fluid contamination coal seam, methane desorption quantity is all greater than 85 than Jxi and coal seam permeability recovery value Sti, then judge that drilling fluid protecting coal seam effect is as fabulous; When behind drilling fluid contamination coal seam, methane desorption quantity is than Jxi > 85, and permeability resume figure Sti≤30, then judge that drilling fluid protecting coal seam effect is as difference.
The invention has the beneficial effects as follows that appraisal drilling liquid is to the protective capability in coal seam effectively, after guaranteeing that drilling fluid enters coal seam
Reservoir original place percolation ability and desorption ability can be kept preferably, avoid coal-seam gas to damage, improve CBM exploration and development comprehensive benefit.
Embodiment
Embodiment:
A kind of drilling fluid protecting coal seam provided by the invention capacity experimental evaluation method; comprise coal-seam gas desorption ability and recover experimental evaluation method, resume permeability experimental evaluation method and drilling fluid protecting coal seam ability decision method; coal-seam gas desorption ability recovers experimental evaluation, wherein:
coal-seam gas desorption ability recovers experimental evaluation method and comprises the steps:
A) coal sample prepares: choose coal grain between 60 ~ 80 mesh sieves, loads in sample pot, by canned full compacting during tinning, claims
Recuperation is 20g to loading sample pot coal grain quality, coal sample adds a cover absorbent cotton, sealed sample tank;
B) coal sample vacuum outgas: open constant temperature system, vacuum pump, setting constant temperature system temperature is 60 ± 1 DEG C, opens sample
Product tank valve, carries out vacuum outgas to coal sample, until pressure sensor monitoring pressure display-0.1MPa reaches 2 hours, stops degassed;
C) coal sample adsorbed methane: after degassed end, adjustment constant temperature system temperature is experimental temperature; Open high pressure methane gas cylinder
Valve and gas injection tank valve, make high pressure methane gas cylinder be communicated with gas injection tank, and buffering enters the gaseous tension of sample pot, when gas injection tank gaseous tension is 1.2 times of sample pot coal sample Ideal adsorption equalized pressure, closes high pressure methane gas cylinder valve; Open the valve connecting sample pot and gas injection tank, by gas injection tank, sample pot is inflated, until reach adsorption equilibrium state;
D) coal sample pollutes front desorption behavior mensuration:
D1) from sample is filled with, fast take out sample and to soak in clear water 0.5 minute;
D2) take out sample, again insert in sample filling, pitch prill clear water, closes pitch prill valve;
D3) get out Chronograph, vacuum sampler and desorption instrument, measure and record temperature and air pressure, respectively by vacuum
Sampler and desorption instrument connect, and then close the valve between sample pot and gasing tank;
D4) first open the valve connecting vacuum sampler, make the free methane in sample pot be introduced into vacuum sampler, when
When the force value of sample pot is zero, close rapidly the valve connecting vacuum sampler, open the valve connecting desorption instrument, open
Open starter gear; Now, instrument automatically reads and records methane desorption quantity Qoi and corresponding time toi; When adjacent note
The methane desorption quantity increment that records of record time is less than 2%(when recording 120 minutes, the first that adjacent writing time records
Alkane desorption quantity increment is less than 2%, and now rock sample unit desorption of methane tolerance is 17.05ml/g), close all appts,
E) coal sample pollutes rear desorption behavior mensuration:
Repeat step a) ~ c), from sample is filled with, fast take out sample and in drilling fluid after immersing degraded 0.5 minute,
Then according to steps d 2) ~ d4), obtain twi writing time polluting rear methane desorption quantity Qwi and correspondence; Record 120
Minute time, the methane desorption quantity increment recorded adjacent writing time is less than 2%, now rock sample unit desorption of methane tolerance
For 16.35ml/g, close all appts,
F) methane desorption quantity is than the mensuration of Jxi:
Calculate Jxi by formula (1) to obtain: 16.35 ÷ 17.05 × 100%=95.9%, illustrate that this drilling fluid can be protected preferably
The desorption ability in coal seam.
resume permeability experimental evaluation method comprises the steps:
A) coal sample original permeability measures: choose the coal stem 1 piece with relative two end faces, two end faces are denoted as A, B respectively, vacuumize 10 hours, then use the saturated coal stem of 3%KCl solution.Then High Temperature High Pressure unblocking instrument is adopted, under confined pressure 3MPa condition, use 3%KCl solution, flow within the scope of pressure at 0.3 ~ 3MPa, respectively with following spot pressure: 0.3MPa, 0.5MPa, 1MPa, 1.5MPa, 2MPa, 2.5MPa, 3MPa forward makes the permeability that KCl solution flows into from A end face, the outflow of B end face records coal sample, maximal value is 0.024 millidarcy, for polluting front coal sample original permeability Koi
, corresponding stream pressure Poi is 0.3MPa;
B) coal sample pollutes rear permeability determination:
B1) drilling fluid contamination coal sample end face: adopt High Temperature High Pressure de-plugging to evaluate instrument, at confined pressure 5MPa, stream pressure 3.5MPa
Under, with the tangential cyclic polluting of drilling fluid above-mentioned coal heart B end face 1 hour;
B2) degraded coal sample end face drilling fluid: keep confined pressure constant, coal sample evaluates airtight in instrument depositing in High Temperature High Pressure de-plugging
85% is reached to drilling fluid degradation rate;
B3) permeability after measuring pollution: under confined pressure 3MPa condition, use 3%KCl solution, in 0.3 ~ 3MPa stream pressure
In scope, respectively with following spot pressure: 0.3MPa, 0.5MPa, 1MPa, 1.5MPa, 2MPa, 2.5MPa, 3MPa
Forward makes the permeability that KCl solution flows into from A end face, the outflow of B end face records coal sample, and maximal value is 0.022 millidarcy
, for polluting rear coal sample permeability Kfi, corresponding stream pressure Pfi is 1.5 MPa.
C) mensuration of permeability resume figure Sti:
Calculate Sti by formula (2) to obtain: 0.022 ÷ 0.024 × 100%=91.7%, illustrates that this drilling fluid can protect the percolation ability in coal seam preferably.
drilling fluid protecting coal seam ability judges:
By above 2 experiments, show that Jxi and Sti is all greater than 85%, in conjunction with drilling fluid protecting coal seam ability Judging index, show that this drilling fluid is fabulous to the protected effect in coal seam.
Claims (2)
1. a drilling fluid protecting coal seam capacity experimental evaluation method, is characterized in that, comprises coal-seam gas desorption ability and recovers experimental evaluation method, resume permeability experimental evaluation method and drilling fluid protecting coal seam ability decision method, wherein:
coal-seam gas desorption ability recovers experimental evaluation method and comprises the steps:
A) coal sample prepares: choose coal grain between 60 ~ 80 mesh sieves, loads in sample pot, and by canned full compacting during tinning, weighing and recording loads sample pot coal grain quality, coal sample adds a cover absorbent cotton, sealed sample tank;
B) coal sample vacuum outgas: open constant temperature system, vacuum pump, setting constant temperature system temperature is 60 ± 1 DEG C, opens
Sample pot valve, carries out vacuum outgas to coal sample, until pressure sensor monitoring pressure display-0.1MPa reaches 2 hours, stops degassed;
C) coal sample adsorbed methane: after degassed end, adjustment constant temperature system temperature is experimental temperature; Open high pressure methane gas cylinder valve and gas injection tank valve, high pressure methane gas cylinder is communicated with gas injection tank, buffering enters the gaseous tension of sample pot, treats that gas injection tank gaseous tension is 1.0 ~ 1.4 times of sample pot coal sample Ideal adsorption equalized pressure, closes high pressure methane gas cylinder valve; Open the valve connecting sample pot and gas injection tank, by gas injection tank, sample pot is inflated, until reach adsorption equilibrium state;
D) coal sample pollutes front desorption behavior mensuration:
D1) from sample is filled with, fast take out sample and to soak in clear water 0.5 ~ 1 minute;
D2) take out sample, again insert in sample filling, pitch prill clear water, closes pitch prill valve;
D3) get out Chronograph, vacuum sampler and desorption instrument, measure and record temperature and air pressure, respectively vacuum sampler and desorption instrument being connected, then close the valve between sample pot and gasing tank;
D4) first open the valve connecting vacuum sampler, make the free methane in sample pot be introduced into vacuum sampler, when the force value of sample pot is zero, close rapidly the valve connecting vacuum sampler, open the valve connecting desorption instrument, open starter gear; Now, instrument automatically reads and records methane desorption quantity Qoi and corresponding time toi; The methane desorption quantity increment recorded when adjacent writing time is less than 2%, closes all appts;
E) coal sample pollutes rear desorption behavior mensuration:
Repeat step a) ~ c), from sample is filled with, fast take out sample and in drilling fluid after immersing degraded 0.5 ~ 1 minute, then according to steps d 2) ~ d4), obtain twi writing time polluting rear methane desorption quantity Qwi and correspondence;
F) methane desorption quantity is than the mensuration of Jxi:
In formula (1):
Qoi: coal sample pollutes front methane desorption quantity, and unit is ml/g;
Qwi: coal sample pollutes rear methane desorption quantity, and unit is ml/g;
resume permeability experimental evaluation method comprises the steps:
A) coal sample original permeability measures:
Choose the coal stem 1 piece with relative two end faces, two end faces are denoted as A, B respectively, vacuumize more than 8 hours, then use the saturated coal stem of 3%KCl solution; Then High Temperature High Pressure unblocking instrument is adopted, under confined pressure 3 ~ 5MPa condition, use 3%KCl solution, flow within the scope of pressure at 0.3 ~ 3MPa, the permeability that KCl solution flows into from A end face, B end face flows out survey coal sample is made respectively with multiple spot pressure forward, maximal value is called pollutes front coal sample original permeability Koi, and the stream pressure Poi that record is corresponding;
B) coal sample pollutes rear permeability determination:
B1) drilling fluid contamination coal sample end face: adopt High Temperature High Pressure de-plugging to evaluate instrument, at confined pressure 5MPa, under flowing pressure 3.5MPa, with the tangential cyclic polluting of drilling fluid above-mentioned coal stem B end face 1 hour;
B2) degraded coal sample end face drilling fluid: keep confined pressure constant, coal sample is airtight in High Temperature High Pressure de-plugging evaluation instrument to be deposited to drilling fluid degradation rate >=85%;
B3) the rear permeability of pollution is measured: under confined pressure 3 ~ 5MPa condition, use 3%KCl solution, flow within the scope of pressure at 0.3 ~ 3MPa, the permeability that KCl solution flows into from A end face, B end face flows out survey coal sample is made respectively with multiple spot pressure forward, maximal value is called pollutes rear coal sample permeability Kfi, and the stream pressure Pfi that record is corresponding;
C) mensuration of permeability resume figure Sti:
In formula (2):
Koi: coal sample original permeability before polluting, unit is millidarcy;
Kfi: coal sample permeability after polluting, unit is millidarcy;
drilling fluid protecting coal seam ability decision method:
When Jxi≤30% and/or Sti≤30%, it is poor that coal seam protected effect is judged to be; When 30% < Jxi≤50% and Sti > 30%, or 30% < Sti≤50% and Jxi > 30% time, coal seam protected effect is judged to be poor; When 50% < Jxi≤70% and Sti > 50%, or 50% < Sti≤70% and Jxi > 50% time, coal seam protected effect is judged to be generally; When 70% < Jxi≤85% and Sti > 70%, or 70% < Sti≤85% and Jxi > 70% time, coal seam protected effect is judged to be better; As Jxi > 85% and Sti > 85% time, coal seam protected effect is judged to be fabulous.
2. a kind of drilling fluid protecting coal seam according to claim 1 capacity experimental evaluation method; it is characterized in that; in resume permeability experimental evaluation method, step a) and step b3) in stream pressure adopt following spot pressure respectively: 0.3MPa, 0.5MPa, 1MPa, 1.5MPa, 2MPa, 2.5MPa, 3MPa.
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| CN108918327A (en) * | 2018-06-13 | 2018-11-30 | 中联煤层气有限责任公司 | For the preferred new method of additive for drilling fluid used in coalbed coring |
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Application publication date: 20150401 |