CN103194189B - A kind of drilling fluid protecting coalbed methane reservoir - Google Patents
A kind of drilling fluid protecting coalbed methane reservoir Download PDFInfo
- Publication number
- CN103194189B CN103194189B CN201310123946.2A CN201310123946A CN103194189B CN 103194189 B CN103194189 B CN 103194189B CN 201310123946 A CN201310123946 A CN 201310123946A CN 103194189 B CN103194189 B CN 103194189B
- Authority
- CN
- China
- Prior art keywords
- drilling fluid
- coalbed methane
- methane reservoir
- water
- reservoir
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Earth Drilling (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a kind of drilling fluid protecting coalbed methane reservoir, this drilling fluid comprises the material of following masses percentage ratio: fresh water: 100 parts, pH value regulator: 0.1～0.3 part, water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part；This drilling fluid density 1.01～1.08g/cm3PH value 8～10; expansion rate reduction rate >=60%; contact angle reduction rate >=50%; recovery rate >=95% under recovery rate >=85%, dry state under core permeability hygrometric state; coal dust Lan Shi volume reduction rate >=15%; free clay phase; homophase can be reduced to greatest extent and invade the coalbed methane reservoir infringement caused, effectively prevent coal petrography CLAY MINERALS AND THEIR SIGNIFICANCE aquation, reduce water lock and promote that coal bed gas is attached from coal petrography surface desorption; it is effectively protected coalbed methane reservoir; and maintain the stability of the coal seam borehole wall, and practical, there is stronger popularization and using value.
Description
Technical field
The invention belongs to oil and gas drilling liquid technology field, particularly relate to a kind of drilling fluid protecting coalbed methane reservoir.
Background technology
Coal bed gas is the unconventional gas resource that storage formula is conigenous in a kind of coal seam itself certainly, and main component is methane.China's Coal bed gas project is about 36.81 trillion m3, it is 3 times of the U.S., suitable with land conventional gas stock number, increase the dynamics to CBM exploration and development in recent years, but commercial scale and commercial value were had not yet been formed, encounter many technical barriers, reservoir protection problem is exactly one of them.Coalbed gas reservoirs and conventional sandstone, carbonate reservoir have very big difference, it has high adsorption, hypotonicity, and easily the most by compression, the characteristic such as broken, these characteristics determine coal seam injuries during CBM Drilling and are much larger than conventional reservoir, and coalbed methane reservoir injury directly influences the desorbing of coal bed gas, spreads, migrates and later stage mining, therefore, coalbed methane reservoir injury problem merits special attention.
Drilling fluid directly contacts with reservoir, and the injury situation causing coalbed methane reservoir is complicated, mainly has: (1) drilling fluid is adsorbed by coal petrography or absorbs, and causes Permeability Oe Coal And Porous Rock And Fractured Rock to decline；(2) in drilling fluid, the filling of crack passage is blocked by solid phase particles；(3) polymerization species mud filtrate invasion coal seam, because of the adsorption of high molecular polymer, causes clay flocculating to block, and carboxyl hydration causes clay swell to block, thus reduces coal seam permeability；(4) drilling fluid produces solid precipitation with formation water effect, causes pore channel to block.
Due to the particularity of coalbed methane reservoir, the drilling fluid that the probing of conventional oil gas reservoir uses is not suitable for this reservoir.Partial Jobs person and technical specialist recommend clear water and carry out coalbed methane reservoir drilling well at present; but experimentation and on-the-spot application show in the most empty; owing to coal seam being contained a small amount of clay mineral or girdle and mud shale alternating layers; clear water can cause water sensitivity infringement and hole instability; in addition China's coalbed methane reservoir permeability is the least, and Water-blocking damage is more serious, therefore; lack at present and can effectively protect coalbed methane reservoir, the drilling fluid of coal seam wellbore stability can be kept again.
Summary of the invention
The invention provides a kind of drilling fluid protecting coalbed methane reservoir; aim to solve the problem that at present in coalbed methane reservoir drilling process; now more serious to the infringement of coalbed methane reservoir with drilling fluid; reduce the permeability of reservoir; make the deficiency of the desorption of coal bed gas, the problem failing effectively to protect coalbed methane reservoir and keep coal seam borehole wall stability.
It is an object of the invention to provide a kind of drilling fluid protecting coalbed methane reservoir, this drilling fluid comprises the material of following masses percentage ratio: fresh water: 100 parts, pH value regulator: 0.1～0.3 part, water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part.
Further, in terms of sodium chloride, described fresh water is the natural fresh water that salinity is less than 1.0%；
Described pH adjusting agent is inorganic base, uses highly basic or strong base-weak acid salt；
Described water sensitivity inhibitor is inorganic salt, uses monovalent salt or divalent salts；
Described Waterproof lock agent is formulated by polyoxyethylated alkyl phenol, polyoxethylene octylphenyl phenol ether and polyether diamine.
Further, described pH adjusting agent is sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate or the mixture being made up of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate.
Further, described water sensitivity inhibitor is sodium chloride, potassium chloride, calcium chloride, magnesium chloride or the mixture being made up of sodium chloride, potassium chloride, calcium chloride, magnesium chloride.
Further, in described Waterproof lock agent, polyoxyethylated alkyl phenol, polyoxethylene octylphenyl phenol ether and the polyether diamine mass ratio when preparation is 1～3: 5: 4～2.
Further, the density 1.01～1.08g/cm of this drilling fluid3, pH value 8～10, expansion rate reduction rate >=60%, contact angle reduction rate >=50%, recovery rate >=85% under core permeability hygrometric state, recovery rate >=95% under dry state, coal dust Lan Shi volume reduction rate >=15%.
Further, the drilling fluid of this protection coalbed methane reservoir application process in coalbed methane reservoir drilling process is:
In time drilling coalbed methane reservoir cap rock, enter coalbed methane reservoir, inject aequum without being stained with the fresh water with slurry of phase to fluid-containing pot；
PH value regulator, water sensitivity inhibitor and Waterproof lock agent are sequentially added in fresh water with slurry, are stirred well to dissolve, carry out drillng operation；
Operation process regulates and controls mud pump delivery and pump pressure, meets under the conditions of carrying ickings, control discharge capacity and show that pump pressure is at minimum.
Further, the drilling fluid coal bed gas adsorption-desorption device for evaluating performance of described protection coalbed methane reservoir includes: methane gas tank, the first surge tank, the first Pressure gauge, gasing tank, the second surge tank, the second Pressure gauge, adsorption tanks, water-bath, vacuum pump, the 3rd Pressure gauge；
Described methane gas tank is arranged on the left side of described water-bath, described first surge tank connects described methane gas tank, described first Pressure gauge is arranged on described first surge tank, reached gasing tank connects described first surge tank, described second surge tank connects described first surge tank and adsorption tanks, described second Pressure gauge is arranged on described second surge tank, described vacuum pump connects described second surge tank, described 3rd Pressure gauge is arranged on described vacuum pump, arranges described gasing tank and adsorption tanks in described water-bath.
The drilling fluid of the protection coalbed methane reservoir that the present invention provides, this drilling fluid comprises the material of following masses percentage ratio: fresh water: 100 parts, pH value regulator: 0.1～0.3 part, water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part；This drilling fluid density 1.01～1.08g/cm3PH value 8～10; expansion rate reduction rate >=60%; contact angle reduction rate >=50%; recovery rate >=95% under recovery rate >=85%, dry state under core permeability hygrometric state; coal dust Lan Shi volume reduction rate >=15%; free clay phase; the coalbed methane reservoir infringement that solid invasion causes can be reduced to greatest extent, effectively prevent coal petrography CLAY MINERALS AND THEIR SIGNIFICANCE aquation, reduce water lock and promote that coal bed gas is attached at coal petrography surface desorption; it is effectively protected coalbed methane reservoir; and maintain the stability of the coal seam borehole wall, and practical, there is stronger popularization and using value.
Accompanying drawing explanation
Fig. 1 is the flowchart of the drilling fluid of the protection coalbed methane reservoir that the embodiment of the present invention provides application process in coalbed methane reservoir drilling process；
Fig. 2 is the structural representation of the coal bed gas adsorption-desorption device for evaluating performance that the embodiment of the present invention provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to limit invention.
It is an object of the invention to provide a kind of drilling fluid protecting coalbed methane reservoir, this drilling fluid comprises the material of following masses percentage ratio: fresh water: 100 parts, pH value regulator: 0.1～0.3 part, water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part.
In embodiments of the present invention, described fresh water is the natural fresh water that salinity is less than 1.0%；
PH adjusting agent is inorganic base, uses highly basic or strong base-weak acid salt；
Water sensitivity inhibitor is inorganic salt, uses monovalent salt or divalent salts；
Waterproof lock agent is formulated by polyoxyethylated alkyl phenol, polyoxethylene octylphenyl phenol ether and polyether diamine.
In embodiments of the present invention, pH adjusting agent is sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate or the mixture being made up of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate.
In embodiments of the present invention, water sensitivity inhibitor is sodium chloride, potassium chloride, calcium chloride, magnesium chloride or the mixture being made up of sodium chloride, potassium chloride, calcium chloride, magnesium chloride.
In embodiments of the present invention, in Waterproof lock agent, polyoxyethylated alkyl phenol, polyoxethylene octylphenyl phenol ether and the polyether diamine mass ratio when preparation is 1～3: 5: 4～2.
In embodiments of the present invention, the density 1.01～1.08g/cm of this drilling fluid3, pH value 8～10, expansion rate reduction rate >=60%, contact angle reduction rate >=50%, recovery rate >=85% under core permeability hygrometric state, recovery rate >=95% under dry state, coal dust Lan Shi volume reduction rate >=15%.
In embodiments of the present invention, the drilling fluid of this protection coalbed methane reservoir application process in coalbed methane reservoir drilling process is:
In time drilling coalbed methane reservoir cap rock, enter coalbed methane reservoir, inject the fresh water with slurry of aequum free clay phase to fluid-containing pot；
PH value regulator, water sensitivity inhibitor and Waterproof lock agent are sequentially added in fresh water with slurry, are stirred well to dissolve, carry out drillng operation；
Operation process regulates and controls mud pump delivery and pump pressure, meets under the conditions of carrying ickings, control discharge capacity and pump pressure at minimum.
In embodiments of the present invention, the drilling fluid coal bed gas adsorption-desorption device for evaluating performance of protection coalbed methane reservoir includes: methane gas tank, the first surge tank, the first Pressure gauge, gasing tank, the second surge tank, the second Pressure gauge, adsorption tanks, water-bath, vacuum pump, the 3rd Pressure gauge；
Methane gas tank is arranged on the left side of water-bath, first surge tank connects methane gas tank, first Pressure gauge is arranged on the first surge tank, gasing tank connects the first surge tank, second surge tank connects the first surge tank and adsorption tanks, and the second Pressure gauge is arranged on the second surge tank, and vacuum pump connects the second surge tank, 3rd Pressure gauge is arranged on vacuum pump, arranges gasing tank and adsorption tanks in water-bath.
What Fig. 1 showed the drilling fluid of the protection coalbed methane reservoir that the embodiment of the present invention provides application process in coalbed methane reservoir drilling process realizes flow process.
In embodiments of the present invention, the drilling fluid of this protection coalbed methane reservoir application process in coalbed methane reservoir drilling process is:
In step S101, in time drilling coalbed methane reservoir cap rock, enter coalbed methane reservoir, inject the fresh water with slurry of aequum free clay phase to fluid-containing pot；
In step s 102, pH value regulator, water sensitivity inhibitor and Waterproof lock agent are sequentially added in fresh water with slurry, are stirred well to dissolve, carry out drillng operation；
In step s 103, operation process regulates and controls mud pump delivery and pump pressure, meet under the conditions of carrying ickings, control discharge capacity and pump pressure at minimum.
Below in conjunction with the accompanying drawings and the application principle of the present invention is further described by specific embodiment.
It is an object of the invention to in current coalbed methane reservoir drilling process; now more serious to the infringement of coalbed methane reservoir with drilling fluid; the permeability reducing reservoir the deficiency of the desorption having influence on coal bed gas; a kind of drilling fluid protecting coalbed methane reservoir is provided, solves the formation damage problem in 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 regulator, water sensitivity inhibitor and Waterproof lock agent；
According to the concrete preferred embodiment of the present invention, in the coal bed gas protection drilling fluid in the present invention, fresh water is the salinity (in terms of the sodium chloride) natural fresh water less than 1.0%, or treated fresh water；PH adjusting agent is inorganic base, can be highly basic or strong base-weak acid salt；Water sensitivity inhibitor is inorganic salt, can be monovalent salt or divalent salts；Waterproof lock agent formulated by non-ionic water-soluble surfactant polyoxyethylene alkyl phenol ether, polyoxethylene octylphenyl phenol ether and polyether diamine.
According to the concrete preferred embodiment of the present invention, in the coal bed gas protection drilling fluid in the present invention, pH adjusting agent is sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate or the mixture being made up of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate；Water sensitivity inhibitor is sodium chloride, potassium chloride, calcium chloride, magnesium chloride or the mixture being made up of sodium chloride, potassium chloride, calcium chloride, magnesium chloride；In Waterproof lock agent, polyoxyethylated alkyl phenol, polyoxethylene octylphenyl phenol ether and polyether diamine are non-ionic water-soluble surfactant.
According to the concrete preferred embodiment of the present invention, in the coal bed gas protection drilling fluid in the present invention, in Waterproof lock agent, polyoxyethylated alkyl phenol, polyoxethylene octylphenyl phenol ether and the polyether diamine mass ratio when preparation is 1～3: 5: 4～2.
According to the concrete preferred embodiment of the present invention, in the coal bed gas protection drilling fluid in the present invention, pH adjusting agent is mainly used in adjusting the pH of drilling fluid; drilling fluid is made to be in 8-0; be conducive to Waterproof lock agent to dissolve, reduce the corrosion to drilling tool of the water sensitivity inhibitor, eliminate the tamper in coalbed methane reservoir.
Concrete preferred embodiment according to the present invention; in coal bed gas protection drilling fluid in the present invention; water sensitivity inhibitor is mainly used in preventing a small amount of clay mineral aquation in reservoir; simultaneously because activity difference can also make coalbed methane reservoir " chap " goes out microfissure; be conducive to improving reservoir permeability; water sensitivity inhibitor in the present invention selects inorganic salt, at coal petrography internal pore surface, will not block coal-bed methane seepage passage and affect coal bed gas desorption by Long-Term Sorption as organic polymer.
Concrete preferred embodiment according to the present invention, in coal bed gas protection drilling fluid in the present invention, Waterproof lock agent is mainly used in reducing the infringement that coalbed methane reservoir water is caused, there is consumption little, the feature that action effect is good, can also promote that coal bed gas is attached from coal petrography surface desorption simultaneously, Waterproof lock agent in this invention is for coal petrography organic matter surface, and the feature that hydrophilic is weak, developed by preferred surfactant kind and proportion optimizing, Waterproof lock agent is adsorbed on coal petrography surface by non-polar end, surface hydrophilicity is made to strengthen, thus reduce water lock and the coal bed gas adsorbance on coal petrography surface.
Concrete preferred embodiment according to the present invention; coal bed gas protection drilling fluid in the present invention, in terms of water base in drilling fluid, in this drilling fluid, pH adjusting agent dosage is 0.1g～0.3g/100g water; water sensitivity inhibitor dosage is 0.5g～10g/100g water, and Waterproof lock agent dosage is 0.1g～1g/100g water.
The drilling fluid of the protection coalbed methane reservoir according to the present invention, density 1.01～1.08g/cm3, pH value 8～10, expansion rate reduction rate >=60%, contact angle reduction rate >=50%, recovery rate >=95% under recovery rate >=85%, dry state under core permeability hygrometric state, coal dust Lan Shi volume reduction rate >=15%.
In the drilling fluid of the protection coalbed methane reservoir of the present invention, each constitutive material is the most commercially available, can be selected for general industrial products.
The drilling fluid of the protection coalbed methane reservoir that present invention also offers technique for applying in coalbed methane reservoir drilling well.
Technique for applying in the drilling fluid coalbed methane reservoir drilling well at the scene of protection coalbed methane reservoir: in time drilling coalbed methane reservoir cap rock, enter coalbed methane reservoir; the fresh water with slurry of aequum free clay phase is injected to fluid-containing pot; again pH value regulator, water sensitivity inhibitor and Waterproof lock agent are sequentially added in water with slurry; it is stirred well to dissolve, carries out drillng operation.Operation process regulates and controls mud pump delivery and pump pressure, meets under the conditions of carrying ickings, control discharge capacity and be pumped at minimum,
The drilling fluid of the protection coalbed methane reservoir that this present invention provides is the drilling fluid of a kind of novel free clay phase protection coalbed methane reservoir, prepares simple, with low cost, and applicable coalbed methane reservoir creeps into.In performance; the coalbed methane reservoir drilling fluid that the present invention provides both had met drilling engineering needs; there is again the advantage of protection coalbed methane reservoir: due to free clay phase (advantage inheriting clear water), the coalbed methane reservoir infringement that solid invasion causes can be reduced to greatest extent；Effectively prevent coal petrography CLAY MINERALS AND THEIR SIGNIFICANCE aquation, even increase the permeability of coalbed methane reservoir；Reduce water lock and promote that coal bed gas is attached at coal petrography surface desorption.In use, the present invention implements to need not formulated equipment, can be used for coal bed gas straight well, directional well and horizontal well.
Detailed description of the invention: the experimental technique employed in following specific embodiment if no special instructions, is conventional method.
Material used in following specific embodiment, reagent etc., if no special instructions, the most commercially obtain.
In pH adjusting agent in the following specific embodiment of the present invention, sodium hydroxide, potassium hydroxide are bought in Jinan century Lian Xing Trade Co., Ltd., and sodium carbonate, sodium bicarbonate are bought in Jinan Zhong Xin Chemical Co., Ltd..
In water sensitivity inhibitor in the following specific embodiment of the present invention, sodium chloride, potassium chloride, calcium chloride, magnesium chloride all buy the Chemical Co., Ltd. of prosperous Tontru in Jinan.
In Waterproof lock agent in the following specific embodiment of the present invention, polyoxyethylated alkyl phenol is purchased from Linyi Hong Sheng Chemical Co., Ltd., polyoxethylene octylphenyl phenol ether is purchased from Zibo Hai Jie Chemical Co., Ltd., and polyether diamine is patent of invention (CN102433110A) at the conversion product of Shandong region Shi great Creative Technology Ltd..
1, the present invention protect the preparation of the drilling fluid of coalbed methane reservoir:
Example 1: the preparation of the drilling fluid of protection coalbed methane reservoir
Formula 1: fresh water 400mL, sodium carbonate 0.60g, sodium hydroxide 0.40g, water sensitivity inhibitor (sodium chloride) 12.00, Waterproof lock agent 1.20g (polyoxyethylated alkyl phenol, polyoxethylene octylphenyl phenol ether and the polyether diamine mass ratio when preparation is 3: 5: 2).
Form according to formula 1, under low speed (600rpm) stirring condition, in fresh water, be sequentially added into sodium carbonate, sodium hydroxide, water sensitivity inhibitor, Waterproof lock agent, the drilling fluid of coalbed methane reservoir must be protected, be designated as 1# drilling fluid.
Example 2: the preparation of the drilling fluid of protection coalbed methane reservoir
Formula 2: fresh water 400mL, sodium carbonate 0.60g, sodium hydroxide 0.40g, water sensitivity inhibitor (sodium chloride and calcium chloride mass ratio are 6: 1) 14.00g, Waterproof lock agent 1.20g (polyoxyethylated alkyl phenol, polyoxethylene octylphenyl phenol ether and the polyether diamine mass ratio when preparation is 2: 5: 3).
Form according to formula 2, under low speed (600rpm) stirring condition, in fresh water, be sequentially added into sodium carbonate, sodium hydroxide, water sensitivity inhibitor, Waterproof lock agent, the drilling fluid of coalbed methane reservoir must be protected, be designated as 2# drilling fluid.
Example 3: the preparation of the drilling fluid of protection coalbed methane reservoir
Formula 3: fresh water 400mL, sodium carbonate 0.60g, potassium hydroxide 0.40g, water sensitivity inhibitor (potassium chloride and calcium chloride mass ratio are 6: 1) 14.00g, Waterproof lock agent 1.20g (polyoxyethylated alkyl phenol, polyoxethylene octylphenyl phenol ether and the polyether diamine mass ratio when preparation is 1: 5: 4).
Form according to formula 3, under low speed (600rpm) stirring condition, in fresh water, be sequentially added into sodium carbonate, potassium hydroxide, water sensitivity inhibitor, Waterproof lock agent, the drilling fluid of coalbed methane reservoir must be protected, be designated as 3# drilling fluid.
2, testing the performance of the drilling fluid of the protection coalbed methane reservoir of the present invention of above-mentioned preparation, concrete operations and method of testing are as follows:
2.1 density measurement
With range at 0.96g/cm3-2.00g/cm3Drilling fluid fluid density meter, test the density of drilling fluid of above-mentioned preparation protection coalbed methane reservoir.
2.2pH value is tested
With pH meter, test the pH value of the drilling fluid of above-mentioned preparation protection coalbed methane reservoir.
2.3 water sensitivity inhibitions are evaluated
With reference to national standard " water-base drilling fluid On-Site Test Procedure (GB/T16783-1997) "; utilize JHTP novel intelligent dilatometer; tested 100 mesh coal dusts compacting rock core above-mentioned preparation protection coalbed methane reservoir drilling fluid in expansion rate; and do blank experiment with clear water, calculate expansion rate reduction rate.
2.4 contact angle tests
Use sessile drop method, utilize the SL200B type contact angle tester of Ke Nuo Industrial Co., Ltd of the U.S., test the coal rock core wettability to the drilling fluid of above-mentioned preparation protection coalbed methane reservoir, and do blank experiment with normal saline solution, calculate contact angle reduction rate.Test temperature: 20 DEG C.
2.5 coal rock core perm-plug method recovery values measure
Perform according to oil and gas industry standard SY/T6540-2002 " damage of drilling fluid and completion fluid oil reservoir indoor evaluation method ", use the Multifunctional oil gas-bearing formation protection evaluating apparatus of Petroleum Univ.'s electromechanics head factory to have rated the drilling fluid protecting coalbed methane reservoir in the present invention reservoir protection effect to coal rock core under hygrometric state and dry conditions.
2.6 on methane in the impact of the attached characteristic of coal petrography surface desorption
Experimental principle: at a constant temperature, corresponding certain adsorbent pressure, the surface of solids can only adsorb a certain amount of gas.By measuring corresponding adsorbance under a series of relative pressures, obtain adsorption isotherm.The absorption of methane be can use Lan Miaoer (Langmuir) equation to state by coal:
V=VL·P/(P+PL)(1)
Formula: V is methane adsorption amount, cm3/g；VLFor Lan Shi volume, cm3/g；P is gas pressure MPa；PLFor Lan Shi pressure, MPa.
The wherein maximal absorptive capacity of Lan Shi volume characterization coal, Lan Shi pressure is the half of Lan Shi volume subpoint on adsorption isothermal curve, represent the steep of adsorption isothermal curve, the little adsorption isothermal curve of its numerical value is the steepest, otherwise it is the mildest, determine pressure decay rate and can the space of blood pressure lowering, and the complexity of blood pressure lowering and workability.
According to above-mentioned principle, design, machined coal bed gas adsorption-desorption characteristics evaluating apparatus, as shown in Figure 2.Coal bed gas adsorption-desorption device for evaluating performance includes: methane gas tank, the first surge tank, the first Pressure gauge, gasing tank, the second surge tank, the second Pressure gauge, adsorption tanks, water-bath, vacuum pump, the 3rd Pressure gauge；Methane gas tank is arranged on the left side of water-bath, first surge tank connects methane gas tank, first Pressure gauge is arranged on the first surge tank, gasing tank connects the first surge tank, second surge tank connects the first surge tank and adsorption tanks, and the second Pressure gauge is arranged on the second surge tank, and vacuum pump connects the second surge tank, 3rd Pressure gauge is arranged on vacuum pump, arranges gasing tank and adsorption tanks in water-bath.Select Qinshui Basin In Shanxi Province coal sample, be crushed to 60-80 mesh, use this device to have rated in the present invention to protect the drilling fluid of coalbed methane reservoir on methane in the impact of the attached characteristic of coal petrography surface desorption, do blank experiment with distilled water, calculate mountain Lan Shi volume reduction rate.
The performance of 1#, 2#, 3# drilling fluid using 2.1～2.6 couples of present invention is tested, and acquired results sees table 1～3:
Table 11# coalbed gas reservoir protection testing performance of drilling fluid result
| Project | Index | Test value |
| Density, g/cm3 | 1.01～1.08 | 1.02 |
| PH value | 8～10 | 8.76 |
| Expansion rate reduction rate, % | ≥60 | 65.81 |
| Contact angle reduction rate, % | ≥50 | 63.22 |
| Recovery of core permeability under hygrometric state, % | ≥85 | 88.34 |
| Recovery of core permeability under dry state, % | ≥95 | 97.46 |
| Lan Shi volume reduction rate, % | ≥15 | 18.17 |
Table 22# coalbed gas reservoir protection testing performance of drilling fluid result
| Project | Index | Test value |
| Density, g/cm3 | 1.01～1.08 | 1.02 |
| PH value | 8～10 | 8.53 |
| Expansion rate reduction rate, % | ≥60 | 70.22 |
| Contact angle reduction rate, % | ≥50 | 71.54 |
| Recovery of core permeability under hygrometric state, % | ≥85 | 91.55 |
| Recovery of core permeability under dry state, % | ≥95 | 98.72 |
| Lan Shi volume reduction rate, % | ≥15 | 20.38 |
Table 33# coalbed gas reservoir protection testing performance of drilling fluid result
| Project | Index | Test value |
| Density, g/cm3 | 1.01～1.08 | 1.02 |
| PH value | 8～10 | 8.51 |
| Expansion rate reduction rate, % | ≥60 | 69.56 |
| Contact angle reduction rate, % | ≥50 | 76.14 |
| Recovery of core permeability under hygrometric state, % | ≥85 | 93.41 |
| Recovery of core permeability under dry state, % | ≥95 | 101.29 |
| Lan Shi volume reduction rate, % | ≥15 | 23.74 |
Finding out from above test result, in the present invention, the property indices of coalbed gas reservoir protection drilling fluid all reaches to design requirement.
The drilling fluid of the protection coalbed methane reservoir that the embodiment of the present invention provides, this drilling fluid comprises the material of following masses percentage ratio: fresh water: 100 parts, pH value regulator: 0.1～0.3 part, water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part；This drilling fluid density 1.01～1.08g/cm3PH value 8～10; expansion rate reduction rate >=60%; contact angle reduction rate >=50%; recovery rate >=95% under recovery rate >=85%, dry state under core permeability hygrometric state; coal dust Lan Shi volume reduction rate >=15%; free clay phase; the coalbed methane reservoir infringement that solid invasion causes can be reduced to greatest extent, effectively prevent coal petrography CLAY MINERALS AND THEIR SIGNIFICANCE aquation, reduce water lock and promote that coal bed gas is attached at coal petrography surface desorption; it is effectively protected coalbed methane reservoir; and maintain the stability of the coal seam borehole wall, and practical, there is stronger popularization and should be worth.
These are only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included within the scope of the present invention.
Claims (1)
1. the drilling fluid protecting coalbed methane reservoir, it is characterised in that this drilling fluid is made up of following number material: fresh water: 100 parts, pH value regulator: 0.1～0.3 part, water sensitivity inhibitor: 0.5～10 part, Waterproof lock agent: 0.1～1 part；
Described fresh water is the natural fresh water that salinity is less than 1.0%；
Described Waterproof lock agent is formulated by polyoxyethylated alkyl phenol, polyoxethylene octylphenyl phenol ether and polyether diamine, and mass ratio during preparation is 1～3: 5: 4～2；
Described pH value regulator is sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate or the mixture being made up of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate；
Described water sensitivity inhibitor is sodium chloride, potassium chloride, calcium chloride, magnesium chloride or the mixture being made up of sodium chloride, potassium chloride, calcium chloride, magnesium chloride；
The density 1.01～1.08g/cm of this drilling fluid3, pH value 8～10, expansion rate reduction rate >=60%, contact angle reduction rate >=50%, recovery rate >=85% under core permeability hygrometric state, recovery rate >=95% under dry state, coal dust Lan Shi volume reduction rate >=15%；
The drilling fluid of this protection coalbed methane reservoir application process in coalbed methane reservoir drilling process is:
In time drilling coalbed methane reservoir cap rock, enter coalbed methane reservoir, inject the fresh water with slurry of aequum free clay phase to fluid-containing pot；
PH value regulator, water sensitivity inhibitor and Waterproof lock agent are sequentially added in fresh water with slurry, are stirred well to dissolve, carry out drillng operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310123946.2A CN103194189B (en) | 2013-04-11 | 2013-04-11 | A kind of drilling fluid protecting coalbed methane reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310123946.2A CN103194189B (en) | 2013-04-11 | 2013-04-11 | A kind of drilling fluid protecting coalbed methane reservoir |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103194189A CN103194189A (en) | 2013-07-10 |
| CN103194189B true CN103194189B (en) | 2016-08-03 |
Family
ID=48717012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310123946.2A Expired - Fee Related CN103194189B (en) | 2013-04-11 | 2013-04-11 | A kind of drilling fluid protecting coalbed methane reservoir |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103194189B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103788933A (en) * | 2014-01-21 | 2014-05-14 | 中国海洋石油总公司 | Coalbed methane (CBM) horizontal well drilling fluid |
| CN104912533B (en) * | 2015-04-20 | 2017-10-24 | 河南理工大学 | A kind of coal seam reservoirs water blocking damage control method |
| CN108918327B (en) * | 2018-06-13 | 2021-09-17 | 中联煤层气有限责任公司 | Novel method for optimizing drilling fluid treatment agent for coal seam characteristics |
| CN109135689A (en) * | 2018-10-19 | 2019-01-04 | 中国石油集团渤海钻探工程有限公司 | Completion fluid pH buffer and preparation method thereof |
| CN112255159B (en) * | 2020-10-10 | 2021-08-10 | 西南石油大学 | Comprehensive evaluation method for hydration capacity of heterogeneous shale reservoir |
| CN115477930B (en) * | 2021-05-31 | 2023-06-30 | 中国石油天然气集团有限公司 | PH stabilizer for drilling fluid and application method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1566255A (en) * | 2003-07-03 | 2005-01-19 | 新疆石油管理局钻井工艺研究院 | Water-based non-clay drilling fluid having strong inhibition |
| CN102020980A (en) * | 2009-09-16 | 2011-04-20 | 中国海洋石油总公司 | Composition used for preventing formation water lock and application thereof |
| CN102127402A (en) * | 2010-12-15 | 2011-07-20 | 中国海洋石油总公司 | High-temperature-resistant clay-phase-free hypotonic reservoir stratum drilling fluid |
| CN102329608A (en) * | 2011-07-25 | 2012-01-25 | 天津科技大学 | Microemulsion for improving core wettability |
| CN102373034A (en) * | 2010-08-10 | 2012-03-14 | 中国石油化工集团公司 | Novel drilling fluid for low permeability gas reservoir and production method thereof |
| CN102536222A (en) * | 2012-01-09 | 2012-07-04 | 中国石油天然气集团公司 | Analog evaluation device for evaluating damage of coalbed methane reservoir polluted by external fluid |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6831042B2 (en) * | 2002-06-17 | 2004-12-14 | Nalco Company | Use of anionic dispersion polymers as viscosity modifiers in aqueous drilling fluids |
-
2013
- 2013-04-11 CN CN201310123946.2A patent/CN103194189B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1566255A (en) * | 2003-07-03 | 2005-01-19 | 新疆石油管理局钻井工艺研究院 | Water-based non-clay drilling fluid having strong inhibition |
| CN102020980A (en) * | 2009-09-16 | 2011-04-20 | 中国海洋石油总公司 | Composition used for preventing formation water lock and application thereof |
| CN102373034A (en) * | 2010-08-10 | 2012-03-14 | 中国石油化工集团公司 | Novel drilling fluid for low permeability gas reservoir and production method thereof |
| CN102127402A (en) * | 2010-12-15 | 2011-07-20 | 中国海洋石油总公司 | High-temperature-resistant clay-phase-free hypotonic reservoir stratum drilling fluid |
| CN102329608A (en) * | 2011-07-25 | 2012-01-25 | 天津科技大学 | Microemulsion for improving core wettability |
| CN102536222A (en) * | 2012-01-09 | 2012-07-04 | 中国石油天然气集团公司 | Analog evaluation device for evaluating damage of coalbed methane reservoir polluted by external fluid |
Non-Patent Citations (2)
| Title |
|---|
| 煤层气储层损害机理与保护钻井液的研究;黄维安等;《煤炭学报》;20121031;第37卷(第10期);第1717-1721页 * |
| 防塌与保护气层的钻井液技术;王富华等;《石油钻探技术》;20060930;第34卷(第05期);第39-43页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103194189A (en) | 2013-07-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103194189B (en) | A kind of drilling fluid protecting coalbed methane reservoir | |
| Huang et al. | Damage mechanism and protection measures of a coalbed methane reservoir in the Zhengzhuang block | |
| CN101429424A (en) | Di-kalium ion-polymer drilling fluid with strong rejection capability | |
| CN104357031A (en) | Silicate-cation alkyl glucoside drilling fluid and preparation method thereof | |
| Dawei et al. | Laboratory research on degradable drilling-in fluid for complex structure wells in coalbed methane reservoirs | |
| CN108774504B (en) | Water-based drilling fluid suitable for salt-gypsum layer and preparation method thereof | |
| Ge et al. | Effect of fines migration and mineral reactions on CO2-water drainage relative permeability | |
| CN104987856B (en) | Offshore drilling fluid pressurization sealing agent and its application process | |
| CN112300764A (en) | Foam formula for safe drilling of water-sensitive stratum and preparation method | |
| Jia et al. | The potential study of ultra-high density heteropolysate solid free brine as well completion fluid for deep reservoir development | |
| CN113122192A (en) | Techniques for controlling slurry properties | |
| CN101649192B (en) | Recycled solidfree micro-foam drilling fluid or completion fluid | |
| Ma et al. | Reservoir stimulation technologies for natural gas hydrate: Research progress, challenges, and perspectives | |
| CN101144009A (en) | Biology modified silicate drilling fluid system | |
| CN101638576B (en) | Shielding and temporary plugging gelling agent for drilling fluid and production method and use method thereof | |
| Elsharafi et al. | Gel Pack-A Novel Concept to Optimize Preformed Particle Gels (PPGs) Conformance Control Treatment Design” | |
| Li et al. | STUDY ON SENSITIVITY OF LOW-PERMEABILITY RESERVOIRS OF WUQI OILFIELD CHANG 6. | |
| CN104293327A (en) | Novel drilling fluid for exploring oil shale | |
| CN105295873B (en) | A kind of water-base drilling fluid inhibitor and water-base drilling fluid and its application | |
| Jie | Performance evaluation and field application of new water-based drilling fluid system in protecting shale gas reservoir | |
| Zhong et al. | Improving the wellbore stability while drilling long open hole shale intervals in tahe oil field | |
| Li et al. | Smart plugging and low-damage foam drilling fluid technology for CBM drilling | |
| CN107366519B (en) | A kind of fine profile control method of chemistry | |
| CN105062435B (en) | Coal bed gas horizontal well small molecule drilling fluid | |
| CN100500795C (en) | Gas well completion fluid for well drilling in oil field |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: China Petroleum University (East China) Document name: Notification of Passing Preliminary Examination of the Application for Invention |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhong Hanyi Inventor after: Qiu Zhengsong Inventor after: Ma Yongle Inventor after: Huang Weian Inventor after: Jiang Lin Inventor after: Cao Jie Inventor after: Bai Xuefei Inventor before: The inventor has waived the right to be mentioned Inventor before: Qiu Zhengsong Inventor before: Ma Yongle Inventor before: Zhong Hanyi Inventor before: Jiang Lin Inventor before: Cao Jie Inventor before: Bai Xuefei |
|
| COR | Change of bibliographic data | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160803 Termination date: 20170411 |