CN103194189A - Drilling fluid capable of protecting coal bed methane reservoir - Google Patents
Drilling fluid capable of protecting coal bed methane reservoir Download PDFInfo
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- CN103194189A CN103194189A CN2013101239462A CN201310123946A CN103194189A CN 103194189 A CN103194189 A CN 103194189A CN 2013101239462 A CN2013101239462 A CN 2013101239462A CN 201310123946 A CN201310123946 A CN 201310123946A CN 103194189 A CN103194189 A CN 103194189A
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Abstract
The invention discloses a drilling fluid capable of protecting a coal bed methane reservoir. The drilling fluid comprises the following ingredients in percentage by weight: 100 parts of fresh water, 0.1-0.3 part of pH value modifier, 0.5-10 parts of water-sensitivity inhibitor, and 0.1-1 part of waterproof blocking agent. For the drilling fluid, the density is 1.01-1.08g/cm<3>, the pH value ranges 8 to 10, the expansion rate reduction ratio is greater than or equal to 60%, the contact angle reduction rate is greater than or equal to 50%, the hygroscopic-state recovery rate of the core permeability is greater than or equal to 85%, the dry-state recovery rate is greater than or equal to 95%, the coal powder landberra volume reduction rate is greater than or equal to 15%, clay-free phase does not exist, the damage to the coal bed methane reservoir caused by same-phase invasion can be furthest reduced, the hydration of the clay mineral in coal petrography can be effectively prevented, water blocking is reduced, the coal bed methane can be forced to be desorbed from the surface of the coal petrography, the coal bed methane reservoir can be effectively protected, the stability of the coal bed well wall can be retained, the practicability is strong, and the stronger popularization and application values can be achieved.
Description
Technical field
The invention belongs to oil and gas drilled hole liquid technical field, relate in particular to a kind of drilling fluid of protecting coalbed methane reservoir.
Background technology
Coal-seam gas is the unconventional gas resources that the storage formula is conigenous in a kind of coal seam itself certainly, and main component is methane.China's coal bed gas resource amount is about 36.81 trillion m
3, be 3 times of the U.S., suitable with land conventional gas stock number, strengthen the dynamics to the cbm exploration exploitation in recent years, but also do not formed technical scale and commercial value, run into many technical barriers, the reservoir protection problem is exactly one of them.Coal-seam gas reservoir and conventional sandstone, carbonate reservoir have very big difference, it has high absorbability, low-permeability, and characteristic such as fragmentation easily by compression,, these characteristics have determined the coal seam is subjected in the coal-seam gas drilling process injury much larger than conventional reservoir, and coalbed methane reservoir injury directly have influence on coal-seam gas desorb, diffusion, migration and the later stage row adopt, therefore, coalbed methane reservoir injury problem merits special attention.
Drilling fluid directly contacts with reservoir, and the injury situation complexity to coalbed methane reservoir causes mainly contains: (1) drilling fluid is adsorbed by coal petrography or absorbs, and causes the coal petrography permeability plugging; (2) solid phase particles stops up the filling of crack passage in the drilling fluid; (3) the polymer class drilling fluid is invaded the coal seam, because of the adsorption of high molecular polymer, causes that clay flocculating stops up, and the carboxyl hydration causes the clay swelling obstruction, thereby reduces the coal seam rate of permeation; (4) drilling fluid and local water effect produce solid precipitation, cause pore channel to stop up.
Because the singularity of coalbed methane reservoir, conventional gas and oil are hidden the drilling fluid of probing use and are not suitable for this reservoir.Partial Jobs person and technical specialist recommend to use clear water to carry out the coalbed methane reservoir drilling well at present; but further empty interior experimental study and rig-site utilization show; owing to contain a small amount of clay mineral or thin seam and mud shale alternating layers in the coal seam; clear water can cause water sensitivity infringement and hole instability; China's coalbed methane reservoir rate of permeation is generally little in addition, and the infringement of water lock is comparatively serious, therefore; shortage can effectively be protected coalbed methane reservoir at present, can keep the drilling fluid of coal seam wellbore stability again.
Summary of the invention
The invention provides a kind of drilling fluid of protecting coalbed methane reservoir; be intended to solve at present in the coalbed methane reservoir drilling process; now more serious to the infringement of coalbed methane reservoir with drilling fluid; reduced the rate of permeation of reservoir; make the deficiency of desorption of coal-seam gas, fail to protect coalbed methane reservoir effectively and keep the problem of coal seam borehole wall stability.
The object of the present invention is to provide a kind of drilling fluid of protecting coalbed methane reservoir; this drilling fluid comprises the material of following mass percent: fresh water: 100 parts; pH value conditioning agent: 0.1～0.3 part, the water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part.
Further, in sodium-chlor, described fresh water is that salinity is lower than 1.0% natural fresh water;
Described pH regulator agent is mineral alkali, adopts highly basic or strong base-weak acid salt;
Described water sensitivity inhibitor is inorganic salt, adopts monovalent salt or divalent salts;
Described Waterproof lock agent is formulated by polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and polyether diamine.
Further, described pH regulator agent is sodium hydroxide, potassium hydroxide, yellow soda ash, sodium bicarbonate or the mixture that is made of sodium hydroxide, potassium hydroxide, yellow soda ash, sodium bicarbonate.
Further, described water sensitivity inhibitor is sodium-chlor, Repone K, calcium chloride, magnesium chloride or the mixture that is made of sodium-chlor, Repone K, calcium chloride, magnesium chloride.
Further, polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and the polyether diamine mass ratio when preparation is 1～3 in the described Waterproof lock agent: 5: 4～2.
Further, the density 1.01～1.08g/cm of this drilling fluid
3, pH value 8～10, rate of expansion reduced rate 〉=60%, contact angle reduced rate 〉=50%, recovery rate under the core permeability hygrometric state 〉=85%, recovery rate under the dry state 〉=95%, coal dust Lan Shi volume reduced rate 〉=15%.
Further, the application method of the drilling fluid of this protection coalbed methane reservoir in the coalbed methane reservoir drilling process is:
Wait to drill the coalbed methane reservoir cap rock, when entering coalbed methane reservoir, join slurry fresh water to what fluid-containing pot injected that aequum do not have the phase of being stained with;
With pH value conditioning agent, water sensitivity inhibitor and Waterproof lock agent be sequentially added into join the slurry fresh water in, be stirred well to dissolving, carry out drilling operation;
Regulation and control mud pump duty and pump pressure in the operation process satisfy and carry under the ickings condition, and the control discharge capacity shows that pump pressure is at Schwellenwert.
Further, the drilling fluid coal-seam gas adsorption-desorption device for evaluating performance of described protection coalbed methane reservoir comprises: methane gas jar, first surge tank, first tensimeter, gasing tank, second surge tank, second tensimeter, adsorption tanks, water-bath, vacuum pump, the 3rd tensimeter;
Described methane gas jar is installed in the left side of described water-bath, described first surge tank connects described methane gas jar, described first tensimeter is installed in described first surge tank, institute reaches gasing tank and connects described first surge tank, described second surge tank connects described first surge tank and adsorption tanks, described second tensimeter is installed in described second surge tank, described vacuum pump connects described second surge tank, described the 3rd tensimeter is installed in described vacuum pump, and described gasing tank and adsorption tanks are set in the described water-bath.
The drilling fluid of protection coalbed methane reservoir provided by the invention, this drilling fluid comprises the material of following mass percent: fresh water: 100 parts, pH value conditioning agent: 0.1～0.3 part, the water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part; This drilling fluid density 1.01～1.08g/cm
3PH value 8～10; rate of expansion reduced rate 〉=60%; contact angle reduced rate 〉=50%; recovery rate under recovery rate under the core permeability hygrometric state 〉=85%, the dry state 〉=95%; coal dust Lan Shi volume reduced rate 〉=15%; no clay phase; can reduce solid phase to greatest extent and invade the coalbed methane reservoir infringement that causes, effectively prevent coal petrography CLAY MINERALS AND THEIR SIGNIFICANCE aquation, reduce the water lock and promote that coal-seam gas is attached at the coal petrography surface desorption; protected coalbed methane reservoir effectively; and kept the stability of the coal seam borehole wall, and practical, have stronger popularization and using value.
Description of drawings
Fig. 1 is the realization flow figure of the application method of drilling fluid in the coalbed methane reservoir drilling process of the protection coalbed methane reservoir that provides of the embodiment of the invention;
Fig. 2 is the structural representation of the coal-seam gas adsorption-desorption device for evaluating performance that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further described in detail.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in and limit invention.
The object of the present invention is to provide a kind of drilling fluid of protecting coalbed methane reservoir; this drilling fluid comprises the material of following mass percent: fresh water: 100 parts; pH value conditioning agent: 0.1～0.3 part, the water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part.
In embodiments of the present invention, described fresh water is that salinity is lower than 1.0% natural fresh water;
The pH regulator agent is mineral alkali, adopts highly basic or strong base-weak acid salt;
The water sensitivity inhibitor is inorganic salt, adopts monovalent salt or divalent salts;
The Waterproof lock agent is formulated by polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and polyether diamine.
In embodiments of the present invention, the pH regulator agent is sodium hydroxide, potassium hydroxide, yellow soda ash, sodium bicarbonate or the mixture that is made of sodium hydroxide, potassium hydroxide, yellow soda ash, sodium bicarbonate.
In embodiments of the present invention, the water sensitivity inhibitor is sodium-chlor, Repone K, calcium chloride, magnesium chloride or the mixture that is made of sodium-chlor, Repone K, calcium chloride, magnesium chloride.
In embodiments of the present invention, polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and the polyether diamine mass ratio when preparation is 1～3 in the Waterproof lock agent: 5: 4～2.
In embodiments of the present invention, the density 1.01～1.08g/cm of this drilling fluid
3, pH value 8～10, rate of expansion reduced rate 〉=60%, contact angle reduced rate 〉=50%, recovery rate under the core permeability hygrometric state 〉=85%, recovery rate under the dry state 〉=95%, coal dust Lan Shi volume reduced rate 〉=15%.
In embodiments of the present invention, the application method of the drilling fluid of this protection coalbed methane reservoir in the coalbed methane reservoir drilling process is:
Wait to drill the coalbed methane reservoir cap rock, when entering coalbed methane reservoir, join slurry fresh water to what fluid-containing pot injected that aequum do not have a clay phase;
With pH value conditioning agent, water sensitivity inhibitor and Waterproof lock agent be sequentially added into join the slurry fresh water in, be stirred well to dissolving, carry out drilling operation;
Regulation and control mud pump duty and pump pressure in the operation process satisfy and carry under the ickings condition, and control discharge capacity and pump pressure are at Schwellenwert.
In embodiments of the present invention, the drilling fluid coal-seam gas adsorption-desorption device for evaluating performance of protection coalbed methane reservoir comprises: methane gas jar, first surge tank, first tensimeter, gasing tank, second surge tank, second tensimeter, adsorption tanks, water-bath, vacuum pump, the 3rd tensimeter;
The methane gas jar is installed in the left side of water-bath, first surge tank connects the methane gas jar, first tensimeter is installed in first surge tank, gasing tank connects first surge tank, second surge tank connects first surge tank and adsorption tanks, and second tensimeter is installed in second surge tank, and vacuum pump connects second surge tank, the 3rd tensimeter is installed in vacuum pump, and gasing tank and adsorption tanks are set in the water-bath.
Fig. 1 shows the realization flow of the application method of drilling fluid in the coalbed methane reservoir drilling process of the protection coalbed methane reservoir that the embodiment of the invention provides.
In embodiments of the present invention, the application method of the drilling fluid of this protection coalbed methane reservoir in the coalbed methane reservoir drilling process is:
In step S101, wait to drill the coalbed methane reservoir cap rock, when entering coalbed methane reservoir, join slurry fresh water to what fluid-containing pot injected that aequum do not have a clay phase;
In step S102, with pH value conditioning agent, water sensitivity inhibitor and Waterproof lock agent be sequentially added into join the slurry fresh water in, be stirred well to dissolving, carry out drilling operation;
In step S103, regulation and control mud pump duty and pump pressure in the operation process satisfy and carry under the ickings condition, and control discharge capacity and pump pressure are at Schwellenwert.
Below in conjunction with drawings and the specific embodiments application principle of the present invention is further described.
The objective of the invention is in the present coalbed methane reservoir drilling process; now more serious to the infringement of coalbed methane reservoir with drilling fluid; reduce the rate of permeation of reservoir and had influence on the deficiency of the desorption of coal-seam gas; a kind of drilling fluid of protecting coalbed methane reservoir is provided, solves the formation damage problem in the coalbed methane reservoir drilling process.
The object of the present invention is achieved like this: the drilling fluid of protection coalbed methane reservoir is formulated by fresh water, pH value conditioning agent, water sensitivity inhibitor and Waterproof lock agent;
According to concrete preferred embodiment of the present invention, fresh water is that salinity (in sodium-chlor) is lower than 1.0% natural fresh water in the coal-seam gas protection drilling fluid among the present invention, or treated fresh water; The pH regulator agent is mineral alkali, can be highly basic or strong base-weak acid salt; The water sensitivity inhibitor is inorganic salt, can be monovalent salt or divalent salts; The Waterproof lock agent formulated by non-ionic water-soluble surfactant polyoxyethylene alkyl phenol ether, polyoxyethylene octyl phenol ether and polyether diamine.
According to concrete preferred embodiment of the present invention, in coal-seam gas among the present invention protection drilling fluid, the pH regulator agent is sodium hydroxide, potassium hydroxide, yellow soda ash, sodium bicarbonate or the mixture that is made of sodium hydroxide, potassium hydroxide, yellow soda ash, sodium bicarbonate; The water sensitivity inhibitor is sodium-chlor, Repone K, calcium chloride, magnesium chloride or the mixture that is made of sodium-chlor, Repone K, calcium chloride, magnesium chloride; In the Waterproof lock agent, polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and polyether diamine are the non-ionic water-soluble tensio-active agent.
According to concrete preferred embodiment of the present invention, in the coal-seam gas protection drilling fluid among the present invention, in the Waterproof lock agent, polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and the polyether diamine mass ratio when preparation is 1～3: 5: 4～2.
According to concrete preferred embodiment of the present invention, in the coal-seam gas protection drilling fluid among the present invention, the pH regulator agent is mainly used in adjusting the pH of drilling fluid; make drilling fluid be in 8-0; be conducive to Waterproof lock agent dissolving, reduce the water sensitivity inhibitor to the corrosion of drilling tool, eliminate the tamper in the coalbed methane reservoir.
According to concrete preferred embodiment of the present invention; in the coal-seam gas protection drilling fluid among the present invention; the water sensitivity inhibitor is mainly used in preventing a small amount of clay mineral aquation in the reservoir; simultaneously because the activity difference can also make coalbed methane reservoir " be full of cracks " go out microfissure; be conducive to improve reservoir permeability; water sensitivity inhibitor among the present invention is selected inorganic salt for use, can be as organic polymer the long-term coal petrography internal pore surface that is adsorbed on, stop up the coal-bed methane seepage passage and influence the coal-seam gas desorption.
According to concrete preferred embodiment of the present invention; in the coal-seam gas protection drilling fluid among the present invention; the Waterproof lock agent is mainly used in reducing the infringement that coalbed methane reservoir water causes; it is little to have consumption; the characteristics that action effect is good; simultaneously can also promote coal-seam gas attached from the coal petrography surface desorption; Waterproof lock agent in this invention is at the organic surface of coal petrography; and the characteristics that wetting ability is weak; develop by preferred surfactant kind and optimization proportioning; the Waterproof lock agent is adsorbed on the coal petrography surface by non-polar end; surface hydrophilicity is strengthened, thereby reduction water lock and coal-seam gas are in the adsorptive capacity on coal petrography surface.
According to concrete preferred embodiment of the present invention; coal-seam gas protection drilling fluid among the present invention; in water base in the drilling fluid; pH regulator agent dosage is 0.1g～0.3g/100g water in this drilling fluid; water sensitivity inhibitor dosage is 0.5g～10g/100g water, and Waterproof lock agent dosage is 0.1g～1g/100g water.
According to the drilling fluid of protection coalbed methane reservoir of the present invention, density 1.01～1.08g/cm
3, pH value 8～10, rate of expansion reduced rate 〉=60%, contact angle reduced rate 〉=50%, recovery rate under recovery rate under the core permeability hygrometric state 〉=85%, the dry state 〉=95%, coal dust Lan Shi volume reduced rate 〉=15%.
In the drilling fluid of protection coalbed methane reservoir of the present invention, each constitutive material is commercially available acquisition all, can select the general industry product for use.
The application art of drilling fluid in the coalbed methane reservoir drilling well of the protection coalbed methane reservoir that the present invention also provides.
The drilling fluid of protection coalbed methane reservoir is application art in the coalbed methane reservoir drilling well at the scene: wait to drill the coalbed methane reservoir cap rock, when entering coalbed methane reservoir; join slurry fresh water to what fluid-containing pot injected that aequum do not have a clay phase; again pH value conditioning agent, water sensitivity inhibitor and Waterproof lock agent are sequentially added into and join in the pulp-water; be stirred well to dissolving, carry out drilling operation.Regulation and control mud pump duty and pump pressure in the operation process satisfy and carry under the ickings condition, control discharge capacity and pump pressure at Schwellenwert,
The drilling fluid of this protection coalbed methane reservoir provided by the invention is the drilling fluid that a kind of novel no clay is protected coalbed methane reservoir mutually, prepares simply, with low cost, and suitable coalbed methane reservoir creeps into.On performance, coalbed methane reservoir drilling fluid provided by the invention had both satisfied the drilling engineering needs, the advantage that has the protection coalbed methane reservoir again: because no clay phase (having inherited the advantage of clear water) can reduce solid phase to greatest extent and invade the coalbed methane reservoir infringement that causes; Effectively prevent coal petrography CLAY MINERALS AND THEIR SIGNIFICANCE aquation, even increase permeability of coal seam; Reduce the water lock and promote that coal-seam gas is attached at the coal petrography surface desorption.In use, the invention process does not need formulated equipment, can be used for coal-seam gas straight well, orientation well and horizontal well.
Embodiment: the experimental technique that adopts in the following specific embodiment is ordinary method if no special instructions.
Used material, reagent etc. if no special instructions, all can obtain from commercial channels in the following specific embodiment.
Sodium hydroxide, potassium hydroxide are bought in joining emerging economy and trade company limited Jinan century in the pH regulator agent in the following specific embodiment of the present invention, and yellow soda ash, sodium bicarbonate are bought letter chemical industry company limited in Jinan.
Sodium-chlor, Repone K, calcium chloride, magnesium chloride are all bought the chemical industry company limited of prosperous Tontru in Jinan in the water sensitivity inhibitor in the following specific embodiment of the present invention.
Polyxyethylated alkylphenol is purchased in Linyi letter and is contained chemical industry company limited in the Waterproof lock agent in the following specific embodiment of the present invention, polyoxyethylene octyl phenol ether is purchased in sea, Zibo outstanding chemical industry company limited, and polyether diamine is that patent of invention (CN102433110A) is at the conversion product of Shandong big Creative Technology Ltd. of Dongying stone.
1, the preparation of the drilling fluid of protection coalbed methane reservoir among the present invention:
Example 1: the preparation of the drilling fluid of protection coalbed methane reservoir
Prescription 1: fresh water 400mL, yellow soda ash 0.60g, sodium hydroxide 0.40g, water sensitivity inhibitor (sodium-chlor) 12.00, Waterproof lock agent 1.20g (polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and the polyether diamine mass ratio when preparation is 3: 5: 2).
Form according to prescription 1, under low speed (600rpm) agitation condition, in fresh water, add yellow soda ash, sodium hydroxide, water sensitivity inhibitor, Waterproof lock agent successively, namely get the drilling fluid of protection coalbed methane reservoir, be designated as the 1# drilling fluid.
Example 2: the preparation of the drilling fluid of protection coalbed methane reservoir
Prescription 2: fresh water 400mL, yellow soda ash 0.60g, sodium hydroxide 0.40g, water sensitivity inhibitor (sodium-chlor and calcium chloride mass ratio are 6: 1) 14.00g, Waterproof lock agent 1.20g (polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and the polyether diamine mass ratio when preparation is 2: 5: 3).
Form according to prescription 2, under low speed (600rpm) agitation condition, in fresh water, add yellow soda ash, sodium hydroxide, water sensitivity inhibitor, Waterproof lock agent successively, namely get the drilling fluid of protection coalbed methane reservoir, be designated as the 2# drilling fluid.
Example 3: the preparation of the drilling fluid of protection coalbed methane reservoir
Prescription 3: fresh water 400mL, yellow soda ash 0.60g, potassium hydroxide 0.40g, water sensitivity inhibitor (Repone K and calcium chloride mass ratio are 6: 1) 14.00g, Waterproof lock agent 1.20g (polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and the polyether diamine mass ratio when preparation is 1: 5: 4).
Form according to prescription 3, under low speed (600rpm) agitation condition, in fresh water, add yellow soda ash, potassium hydroxide, water sensitivity inhibitor, Waterproof lock agent successively, namely get the drilling fluid of protection coalbed methane reservoir, be designated as the 3# drilling fluid.
2, the performance of the drilling fluid of the protection coalbed methane reservoir of the present invention of the above-mentioned preparation of test, concrete operations and testing method are as follows:
2.1 density measurement
With range at 0.96g/cm
3-2.00g/cm
3The drilling fluid liquidensitometer, the density of testing the drilling fluid of above-mentioned preparation protection coalbed methane reservoir.
2.2pH value test
Use pH meter, test the pH value of the drilling fluid of above-mentioned preparation protection coalbed methane reservoir.
2.3 the water sensitivity inhibition is estimated
With reference to national standard " water-base drilling fluid On-Site Test Procedure (GB/T16783-1997) "; utilize JHTP novel intelligent dilatometer; tested the rate of expansion of rock core in the drilling fluid of above-mentioned preparation protection coalbed methane reservoir of 100 order coal dusts compacting; and do blank assay with clear water, calculate the rate of expansion reduced rate.
2.4 contact angle test
Employing stops the method for dripping, and utilizes the SL200B type contact angle tester of U.S. Ke Nuo Industrial Co., Ltd, has tested the wettability of coal petrography rock core to the drilling fluid of above-mentioned preparation protection coalbed methane reservoir, and does blank assay with normal saline solution, calculates the contact angle reduced rate.Probe temperature: 20 ℃.
2.5 coal petrography rock core perm-plug method recovery value is measured
Carry out according to oil and Gas Industry standard SY/T6540-2002 " damage of drilling fluid and completion fluid oil reservoir indoor evaluation method ", the multifunctional oil gas layer protection evaluating apparatus of the dynamo-electric head factory of use Petroleum Univ. (East China) has been estimated under hygrometric state and dry state condition and has been protected the drilling fluid of coalbed methane reservoir to the reservoir protection effect of coal petrography rock core among the present invention.
2.6 to the influence of methane in the attached characteristic of coal petrography surface desorption
Experimental principle: under steady temperature, corresponding certain sorbent material pressure, solid surface can only adsorb a certain amount of gas.By measuring corresponding adsorptive capacity under a series of relative pressures, obtain adsorption isothermal line.Coal is explained the available Lan Miuer of the absorption of methane (Langmuir) equation:
V＝V
L·P/(P+P
L) (1)
Formula: V is the methane adsorptive capacity, cm
3/ g; V
LBe Lan Shi volume, cm
3/ g; P is gaseous tension MPa; P
LBe Lan Shi pressure, MPa.
The maximal absorptive capacity of Lan Shi volume characterization coal wherein, Lan Shi pressure is half subpoint on the isothermal adsorption curve of Lan Shi volume, represent the precipitous degree of isothermal adsorption curve, the little isothermal adsorption curve of its numerical value is then steep, otherwise it is then mild, but determined the space of blowdown rate and step-down, and the complexity of step-down and recoverability.
According to above-mentioned principle, design, processed coal-seam gas adsorption-desorption characteristics evaluating apparatus, as shown in Figure 2.Coal-seam gas adsorption-desorption device for evaluating performance comprises: methane gas jar, first surge tank, first tensimeter, gasing tank, second surge tank, second tensimeter, adsorption tanks, water-bath, vacuum pump, the 3rd tensimeter; The methane gas jar is installed in the left side of water-bath, first surge tank connects the methane gas jar, first tensimeter is installed in first surge tank, gasing tank connects first surge tank, second surge tank connects first surge tank and adsorption tanks, and second tensimeter is installed in second surge tank, and vacuum pump connects second surge tank, the 3rd tensimeter is installed in vacuum pump, and gasing tank and adsorption tanks are set in the water-bath.Select basin, Qinshui, Shanxi coal sample for use, be crushed to the 60-80 order, adopt drilling fluid that this device estimated protection coalbed methane reservoir among the present invention to the influence of methane in the attached characteristic of coal petrography surface desorption, do blank assay with distilled water, calculate mountain Lan Shi volume reduced rate.
Adopt the performance of 2.1～2.6 couples of 1# of the present invention, 2#, 3# drilling fluid to test, the gained result is referring to table 1～3:
Table 1 1# coalbed methane reservoir protection testing performance of drilling fluid result
| Project | Index | Test value |
| Density, g/cm 3 | 1.01～1.08 | 1.02 |
| The pH value | 8～10 | 8.76 |
| The rate of expansion reduced rate, % | ≥60 | 65.81 |
| The contact angle reduced rate, % | ≥50 | 63.22 |
| Recovery of core permeability under the hygrometric state, % | ≥85 | 88.34 |
| Recovery of core permeability under the dry state, % | ≥95 | 97.46 |
| Lan Shi volume reduced rate, % | ≥15 | 18.17 |
Table 2 2# coalbed methane reservoir protection testing performance of drilling fluid result
| Project | Index | Test value |
| Density, g/cm 3 | 1.01～1.08 | 1.02 |
| The pH value | 8～10 | 8.53 |
| The rate of expansion reduced rate, % | ≥60 | 70.22 |
| The contact angle reduced rate, % | ≥50 | 71.54 |
| Recovery of core permeability under the hygrometric state, % | ≥85 | 91.55 |
| Recovery of core permeability under the dry state, % | ≥95 | 98.72 |
| Lan Shi volume reduced rate, % | ≥15 | 20.38 |
Table 3 3# coalbed methane reservoir protection testing performance of drilling fluid result
| Project | Index | Test value |
| Density, g/cm 3 | 1.01～1.08 | 1.02 |
| The pH value | 8～10 | 8.51 |
| The rate of expansion reduced rate, % | ≥60 | 69.56 |
| The contact angle reduced rate, % | ≥50 | 76.14 |
| Recovery of core permeability under the hygrometric state, % | ≥85 | 93.41 |
| Recovery of core permeability under the dry state, % | ≥95 | 101.29 |
| Lan Shi volume reduced rate, % | ≥15 | 23.74 |
Find out that from above test result every performance index of coalbed methane reservoir protection drilling fluid all reach design requirements among the present invention.
The drilling fluid of the protection coalbed methane reservoir that the embodiment of the invention provides, this drilling fluid comprises the material of following mass percent: fresh water: 100 parts, pH value conditioning agent: 0.1～0.3 part, the water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part; This drilling fluid density 1.01～1.08g/cm
3PH value 8～10; rate of expansion reduced rate 〉=60%; contact angle reduced rate 〉=50%; recovery rate under recovery rate under the core permeability hygrometric state 〉=85%, the dry state 〉=95%; coal dust Lan Shi volume reduced rate 〉=15%; no clay phase; can reduce solid phase to greatest extent and invade the coalbed methane reservoir infringement that causes, effectively prevent coal petrography CLAY MINERALS AND THEIR SIGNIFICANCE aquation, reduce the water lock and promote that coal-seam gas is attached at the coal petrography surface desorption; protected coalbed methane reservoir effectively; and kept the stability of the coal seam borehole wall, and practical, have stronger popularization and should be worth.
Below only be preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a drilling fluid of protecting coalbed methane reservoir is characterized in that, this drilling fluid comprises the material of following mass percent: fresh water: 100 parts, and pH value conditioning agent: 0.1～0.3 part, the water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part.
2. the drilling fluid of protection coalbed methane reservoir as claimed in claim 1 is characterized in that, described fresh water is that salinity is lower than 1.0% natural fresh water;
Described pH regulator agent is mineral alkali, adopts highly basic or strong base-weak acid salt;
Described water sensitivity inhibitor is inorganic salt, adopts monovalent salt or divalent salts;
Described Waterproof lock agent is formulated by polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and polyether diamine.
3. the drilling fluid of protection coalbed methane reservoir as claimed in claim 2 is characterized in that, described pH regulator agent is sodium hydroxide, potassium hydroxide, yellow soda ash, sodium bicarbonate or the mixture that is made of sodium hydroxide, potassium hydroxide, yellow soda ash, sodium bicarbonate.
4. the drilling fluid of protection coalbed methane reservoir as claimed in claim 2 is characterized in that, described water sensitivity inhibitor is sodium-chlor, Repone K, calcium chloride, magnesium chloride or the mixture that is made of sodium-chlor, Repone K, calcium chloride, magnesium chloride.
5. the drilling fluid of protection coalbed methane reservoir as claimed in claim 2 is characterized in that, polyxyethylated alkylphenol, polyoxyethylene octyl phenol ether and the polyether diamine mass ratio when preparation is 1～3 in the described Waterproof lock agent: 5: 4～2.
6. the drilling fluid of protection coalbed methane reservoir as claimed in claim 1 is characterized in that, the density 1.01～1.08g/cm of this drilling fluid
3, pH value 8～10, rate of expansion reduced rate 〉=60%, contact angle reduced rate 〉=50%, recovery rate under the core permeability hygrometric state 〉=85%, recovery rate under the dry state 〉=95%, coal dust Lan Shi volume reduced rate 〉=15%.
7. the drilling fluid of protection coalbed methane reservoir as claimed in claim 1 is characterized in that, the application method of the drilling fluid of this protection coalbed methane reservoir in the coalbed methane reservoir drilling process is:
Wait to drill the coalbed methane reservoir cap rock, when entering coalbed methane reservoir, join slurry fresh water to what fluid-containing pot injected that aequum do not have a clay phase;
With pH value conditioning agent, water sensitivity inhibitor and Waterproof lock agent be sequentially added into join the slurry fresh water in, be stirred well to dissolving, carry out drilling operation;
Regulation and control mud pump duty and pump pressure in the operation process satisfy and carry under the ickings condition, and control discharge capacity and pump pressure are at Schwellenwert.
8. the drilling fluid of protection coalbed methane reservoir as claimed in claim 1, it is characterized in that the drilling fluid coal-seam gas adsorption-desorption device for evaluating performance of described protection coalbed methane reservoir comprises: methane gas jar, first surge tank, first tensimeter, gasing tank, second surge tank, second tensimeter, adsorption tanks, water-bath, vacuum pump, the 3rd tensimeter;
Described methane gas jar is installed in the left side of described water-bath, described first surge tank connects described methane gas jar, described first tensimeter is installed in described first surge tank, described gasing tank connects described first surge tank, described second surge tank connects described first surge tank and adsorption tanks, described second tensimeter is installed in described second surge tank, described vacuum pump connects described second surge tank, described the 3rd tensimeter is installed in described vacuum pump, and described gasing tank and adsorption tanks are set in the described water-bath.
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