CN115746802A - Drilling and grinding fluid for long horizontal section well and preparation and application methods thereof - Google Patents
Drilling and grinding fluid for long horizontal section well and preparation and application methods thereof Download PDFInfo
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Abstract
The invention relates to the technical field of drilling and grinding fluid in oil and gas field development, in particular to drilling and grinding fluid for a long horizontal section well and a preparation and use method thereof, wherein the drilling and grinding fluid is prepared by mixing the following substances in percentage by weight: 50-60% of base oil, 15-18% of anionic surfactant, 15-20% of nonionic surfactant, 0.01-0.05% of thickening agent, 3-5% of corrosion inhibitor, 1-3% of pH regulator and the balance of water; the drilling and grinding fluid can obviously reduce the frictional resistance between a drilling and grinding pipe column and a shaft and between a drill bit and a drilling and grinding object, and improve the running efficiency and the drilling and grinding power of the pipe column in a horizontal section; in the construction process, drilling and grinding fluid is diluted into aqueous solution with the mass concentration of 1-2% for use, the diluent is pumped into a drilling and grinding pipe column from a ground pump set and flows out through a drill bit water hole, chippings carried by the drilling and grinding fluid return from an annulus between a shaft and a drill rod, and the returned fluid is recycled after simple sedimentation and filtration; the drilling and grinding fluid has the advantages of low cost, wide application range, low corrosivity and convenient field use and preparation.
Description
Technical Field
The invention relates to the technical field of drilling and grinding fluid in oil and gas field development, in particular to drilling and grinding fluid for a long horizontal section well and a preparation and use method thereof.
Background
In the development of oil and gas fields, the synchronous transformation of reservoirs at different positions can be realized by multi-layer and multi-section fracturing, and the efficiency is high while the single-well oil and gas productivity is improved. In the fracturing of multilayer multistage, need to use the bridging plug to separate the back in proper order and follow supreme fracturing transformation down in the interval, need to bore down and grind the bridging plug after treating that all intervals construction is accomplished to get through the exploitation of well realization oil, gas. Compared with a vertical well, the bridge plug drilling and grinding in a horizontal well is difficult to implement, particularly in a horizontal well with an ultra-long horizontal section (> 3000 m). This is because the frictional resistance between the horizontal section and the wellbore of the drilling and grinding pipe string is greater than the gravity of the pipe string in the vertical section, so that the pipe string and the drilling tool are difficult to reach the position of the bridge plug for operation. The longer the horizontal section, the greater the frictional resistance, and the more difficult the drilling and grinding pipe column footage. The conventional fracturing fluid is low-concentration fracturing fluid such as guanidine glue solution, slickwater and the like, the viscosity of the fracturing fluid can carry fragments after drilling out of a bridge plug drilling and grinding fluid well barrel, but the lubricating effect of the fracturing fluid on a drilling and grinding pipe column is limited (the friction coefficient is greater than 0.2), and the construction requirement of an ultra-long horizontal section well is difficult to meet. Therefore, it is necessary to provide a special drilling fluid for improving the bridge plug drilling efficiency of a long horizontal section well.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides the drilling and grinding fluid for the long horizontal section well and the preparation and use methods thereof, particularly the drilling and grinding fluid has the capability of carrying debris to return out of a shaft, and meanwhile, the frictional resistance between a drilling and grinding pipe column and the shaft and between a drill bit and a drilling and grinding object can be obviously reduced, and the running efficiency and the drilling and grinding power of the pipe column in the horizontal section are improved.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
the drilling and grinding fluid for the long horizontal section well is prepared by mixing the following substances in percentage by weight:
base oil: 50-60 percent;
anionic surfactant: 15 to 18 percent;
nonionic surfactant: 15 to 20 percent;
thickening agent: 0.01 to 0.05 percent;
corrosion inhibitor: 3 to 5 percent;
pH regulator: 1 to 3 percent;
water: and the balance.
Further, the base oil is one of 60N, 100N and 150N.
Further, the anionic surfactant is one or a mixture of more of petroleum sodium sulfonate, ammonium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium hexadecyl benzene sulfonate.
Further, the nonionic surfactant is one of nonylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.
Furthermore, the nonylphenol polyoxyethylene ether is NP-4 or NP-7, and the fatty alcohol polyoxyethylene ether is AEO-3 or AEO-5.
Further, the thickening agent is one of guanidine gum powder, hydroxypropyl guanidine gum, polyacrylamide and polyacrylamide potassium salt.
Furthermore, the molecular weight of the polyacrylamide is 500-1000 ten thousand.
Furthermore, the corrosion inhibitor is one or a compound of morpholine and manchini alkali HJF-94; the pH regulator is diethanolamine.
A preparation method of the drilling and grinding fluid for the long horizontal segment well is used for preparing the drilling and grinding fluid for the long horizontal segment well, and comprises the following steps:
respectively weighing the base oil, the anionic surfactant, the nonionic surfactant, the thickening agent and the corrosion inhibitor according to the weight percentage of the formula, uniformly stirring, heating to 60-80 ℃, then adding water with the formula amount, continuously stirring for 50-70min, finally adjusting the pH value of the system to 7-9 by adopting a pH regulator, and cooling to room temperature to obtain the brown oily drilling and grinding fluid.
A use method of the drilling and grinding fluid for the long horizontal segment well comprises any one of the drilling and grinding fluids, wherein the drilling and grinding fluid is diluted into a drilling and grinding dilution water solution with the mass concentration of 1-2% for use, and the specific use method comprises the following steps: in the construction process, drilling and grinding dilution water solution is pumped into a drilling and grinding pipe column from a ground pump set and flows out through a drill bit water hole, the drilling and grinding dilution water solution carries debris to return from an annular space between a shaft and a drill rod after drilling and grinding, and the return liquid is simply settled and filtered for recycling.
The invention has the beneficial effects that:
compared with the prior art, the base oil is emulsified and dispersed in water to play a role in lubricating and reducing resistance by compounding the anionic surfactant and the nonionic surfactant. The thickening agent is used for improving the viscosity of a system, plays a role in carrying chips to be discharged back out of a shaft, and has a function of reducing the self friction of liquid. The corrosion inhibitor is used for reducing the corrosion of liquid to a drilling and grinding pipe column and a shaft. The pH regulator is used for preventing the thickener from hydrolysis and has an antiseptic effect.
According to the drilling and grinding fluid for the long horizontal section well and the preparation and use methods thereof, disclosed by the invention, the diluted aqueous solution of the drilling and grinding fluid is used in drilling and grinding construction, so that the frictional resistance between a drilling and grinding pipe column and the inner wall of a shaft can be effectively reduced, and the running and plugging efficiency of the drilling and grinding pipe column is improved. In addition, the drilling and grinding fluid has the advantages of low cost, wide application range, low corrosivity, convenience in field preparation and the like.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a graph of coefficient of friction versus time for 1%, 1.5% and 2% drill mill dilute aqueous solutions of the present invention.
FIG. 2 is a diagram of cement debris returned from a gas well constructed by using a diluted aqueous solution of the drilling fluid of the present invention.
Detailed Description
It should be noted that, in the embodiments of the present invention, the manchiny base HJF-94 is a manchiny base corrosion inhibitor HJF-94 (manufacturer: china oil and gas products, ltd.).
The present invention provides a long horizontal section well drilling fluid and a method for preparing and using the same, which are described in detail below by way of several specific examples.
Example 1:
the drilling and grinding fluid for the long horizontal section well is prepared by mixing the following substances in percentage by weight:
base oil: 50-60 percent;
anionic surfactant: 15 to 18 percent;
nonionic surfactant: 15 to 20 percent;
thickening agent: 0.01 to 0.05 percent;
corrosion inhibitor: 3 to 5 percent;
pH regulator: 1 to 3 percent;
water: and (4) the balance.
The anionic surfactant and the nonionic surfactant emulsify and disperse the base oil in water to play a role in lubricating and reducing resistance, the thickener is used for improving the viscosity of a system, the corrosion inhibitor is used for reducing the corrosion of liquid to a pipe column and a shaft, and the pH regulator is used for preventing the hydrolysis of the thickener and preventing corrosion.
Further, the base oil is one of 60N, 100N and 150N.
Further, the anionic surfactant is one or a mixture of more of petroleum sodium sulfonate, ammonium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium hexadecyl benzene sulfonate.
Further, the nonionic surfactant is one of nonylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.
Further, the nonylphenol polyoxyethylene ether is NP-4 or NP-7, and the fatty alcohol polyoxyethylene ether is AEO-3 or AEO-5.
Further, the thickening agent is one of guanidine gum powder, hydroxypropyl guanidine gum, polyacrylamide and polyacrylamide potassium salt.
Furthermore, the molecular weight of the polyacrylamide is 500-1000 ten thousand, and the polyacrylamide with the molecular weight is suitable for preparing the drilling and grinding fluid with the formula amount in the invention, wherein the polyacrylamide with the molecular weight has the best effect of improving the viscosity of the system.
Furthermore, the corrosion inhibitor is one or a compound of morpholine and manchini alkali HJF-94; the pH regulator is diethanolamine.
A preparation method of the drilling and grinding fluid for the long horizontal segment well is used for preparing any one of the drilling and grinding fluids for the long horizontal segment well, and comprises the following steps:
respectively weighing the base oil, the anionic surfactant, the nonionic surfactant, the thickening agent and the corrosion inhibitor according to the weight percentage of the formula, uniformly stirring, heating to 60-80 ℃, then adding the water with the formula amount, continuously stirring for 50-70min, finally adjusting the pH value of the system to 7-9 by adopting the pH regulator, and cooling to room temperature to obtain the brown oily drilling and grinding fluid.
The following is further illustrated by way of practical examples:
the heating temperature in the preparation methods in the following examples is 70 ℃, and the stirring time is 60min for stirring.
Example 2:
the drilling and grinding fluid for the long horizontal section well is prepared by mixing the following substances in percentage by weight:
base oil: 50 percent;
anionic surfactant: 15 percent;
nonionic surfactant: 18 percent;
thickening agent: 0.01 percent;
corrosion inhibitor: 3 percent;
pH regulator: 2 percent;
water: and (4) the balance.
A preparation method of the drilling and grinding fluid for the long horizontal section well is used for preparing the drilling and grinding fluid for the long horizontal section well, and comprises the following steps:
respectively weighing 50% of base oil according to the weight percentage of the formula, wherein the base oil is 60N;
15% of anionic surfactant, wherein the anionic surfactant is petroleum sodium sulfonate;
18% of nonionic surfactant, wherein the nonionic surfactant is fatty alcohol-polyoxyethylene ether, specifically AEO-3;
0.01% of thickening agent, wherein the thickening agent is polyacrylamide (with the molecular weight of 500-1000 ten thousand);
3% of corrosion inhibitor, wherein the corrosion inhibitor is morpholine;
mixing, heating to 70 ℃ after uniformly stirring, adding the balance of water, continuously stirring for 60min, finally adjusting the pH value of the system to 7.5 by adopting a 2% pH regulator, and cooling to room temperature to obtain a tan oily drilling fluid, wherein the pH regulator in the embodiment is diethanol amine.
Example 3:
the drilling and grinding fluid for the long horizontal section well is prepared by mixing the following substances in percentage by weight:
base oil: 55 percent;
anionic surfactant: 15 percent;
nonionic surfactant: 20 percent;
thickening agent: 0.01 percent;
corrosion inhibitor: 5 percent;
pH regulator: 1.5 percent;
water: and (4) the balance.
A preparation method of the drilling and grinding fluid for the long horizontal section well is used for preparing the drilling and grinding fluid for the long horizontal section well, and comprises the following steps:
respectively weighing 55% of base oil according to the weight percentage of the formula, wherein the base oil is 60N;
15% of anionic surfactant, wherein the anionic surfactant is sodium dodecyl sulfate;
20% of a nonionic surfactant, wherein the nonionic surfactant is fatty alcohol-polyoxyethylene ether, specifically AEO-5;
0.01% of thickening agent, wherein the thickening agent is polyacrylamide (with the molecular weight of 500-1000 ten thousand);
5% of corrosion inhibitor, wherein the corrosion inhibitor is morpholine;
mixing, heating to 70 ℃ after uniformly stirring, adding the balance of water, continuously stirring for 60min, finally adjusting the pH value of the system to 7 by adopting 1.5% of pH regulator, and cooling to room temperature to obtain a dark brown oily drilling and grinding fluid, wherein the pH regulator in the embodiment is diethanol amine.
Example 4:
the drilling and grinding fluid for the long horizontal section well is prepared by mixing the following substances in percentage by weight:
base oil: 55 percent;
anionic surfactant: 18 percent;
nonionic surfactant: 20 percent;
thickening agent: 0.03 percent;
corrosion inhibitor: 3 percent;
pH regulator: 2 percent;
water: and (4) the balance.
A preparation method of the drilling and grinding fluid for the long horizontal section well is used for preparing the drilling and grinding fluid for the long horizontal section well, and comprises the following steps:
respectively weighing 55% of base oil according to the weight percentage of the formula, wherein the base oil is 150N;
18% of an anionic surfactant, wherein the anionic surfactant is sodium dodecyl sulfate;
20% of a nonionic surfactant, wherein the nonionic surfactant is nonylphenol polyoxyethylene ether, and is specifically NP-4;
0.03% of a thickening agent, wherein the thickening agent is guanidine gum powder;
3% of corrosion inhibitor, wherein the corrosion inhibitor is Schinifedipine HJF-94;
mixing, heating to 70 ℃ after uniformly stirring, adding the balance of water, continuously stirring for 60min, finally adjusting the pH value of the system to 7.8 by adopting a 2% pH regulator, and cooling to room temperature to obtain a tan oily drilling fluid, wherein the pH regulator in the embodiment is diethanol amine.
Example 5:
the drilling and grinding fluid for the long horizontal section well is prepared by mixing the following substances in percentage by weight:
base oil: 55 percent;
anionic surfactant: 18 percent;
nonionic surfactant: 15 percent;
thickening agent: 0.03 percent;
corrosion inhibitor: 4 percent;
pH regulator: 3 percent;
water: and (4) the balance.
A preparation method of the drilling and grinding fluid for the long horizontal section well is used for preparing the drilling and grinding fluid for the long horizontal section well, and comprises the following steps:
respectively weighing 55% of base oil according to the weight percentage of the formula, wherein the base oil is 60N;
18% of anionic surfactant, wherein the anionic surfactant is a mixture of sodium petroleum sulfonate and sodium dodecyl sulfate;
15% of nonionic surfactant, wherein the nonionic surfactant is fatty alcohol-polyoxyethylene ether, specifically AEO-3;
0.03% of thickening agent, wherein the thickening agent is hydroxypropyl guar gum;
4% of corrosion inhibitor, wherein the corrosion inhibitor is Mannich bases HJF-94;
mixing, heating to 70 ℃ after uniformly stirring, adding the balance of water, continuously stirring for 60min, finally adjusting the pH value of the system to 8.5 by using a 3% pH regulator, and cooling to room temperature to obtain a tan oily drilling fluid, wherein the pH regulator in the embodiment is diethanolamine.
Example 6:
a use method of the drilling and grinding fluid for the long horizontal segment well comprises the drilling and grinding fluid for the long horizontal segment well, which is diluted into a drilling and grinding dilution water solution with the mass concentration of 1-2% for use, and specifically comprises the following steps: in the construction process, drilling and grinding dilution water solution is pumped into a drilling and grinding pipe column from a ground pump set and flows out through a drill bit water hole, the drilling and grinding dilution water solution carries debris to return from an annular space between a shaft and a drill rod after drilling and grinding, and the return liquid is simply settled and filtered for recycling.
The water diluent of the drilling and grinding fluid is used in drilling and grinding construction, so that the frictional resistance between the drilling and grinding pipe column and the inner wall of a shaft can be effectively reduced, and the running and drilling and plugging efficiency of the drilling and grinding pipe column is improved.
The drilling fluid prepared in example 3 was subjected to the following laboratory tests.
The friction coefficient-time curves of drilling and grinding dilution water solutions with mass concentrations of 1%, 1.5% and 2% are shown in figure 1, the average friction coefficients in the test time are respectively 0.161,0.158 and 0.152, and are reduced by more than 20% compared with the existing drilling and grinding fluid, which indicates that the drilling and grinding fluid has better lubrication and resistance reduction effects.
The drilling fluid prepared in example 3 below was subjected to field testing.
The test was conducted on a horizontal well of natural gas, drilled at a depth of 3942m and a horizontal length of 1256m, requiring a removal operation of the residual cement plug in the wellbore to restore the wellbore.
Preparing drilling and grinding diluent with mass concentration of 1% 30m on site 3 And (3) matching with 2-inch coiled tubing for construction. Taking the drilling and grinding construction of sections 3315-3490m as an example: the average drilling and grinding speed is 30m/h, the suspended weight is 5.4kN, the discharge capacity is 480L/min, the pump pressure is 22.0MPa, and the drilling pressure is 20-40KN. Well head returnThe cement chips carried by the drilling fluid are shown in figure 2, which shows that the drilling fluid has good chip carrying capacity and meets the requirements of site construction.
The long-horizontal-section well drilling and grinding fluid is used in the form of a diluted aqueous solution, and the mass concentration of the drilling and grinding fluid is 1-2%. In the construction process, diluent is pumped into the drilling and grinding pipe column from a ground pump set and flows out through a drill bit water hole, the drilling and grinding liquid carries debris to return from an annulus between a shaft and a drill rod, and the return liquid can be recycled after simple sedimentation and filtration. The drilling and grinding diluent used in the drilling and grinding construction of the long horizontal section well can effectively reduce the frictional resistance between the drilling and grinding pipe column and the inner wall of the shaft, and improve the running and plugging efficiency of the drilling and grinding pipe column. In addition, the drilling and grinding fluid has the advantages of low cost, wide application range, low corrosivity and convenient field preparation.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention, and the present invention is within the scope of protection of the technology.
Technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Claims (10)
1. The utility model provides a long horizontal segment well drilling grinding fluid which characterized by: the paint is prepared by mixing the following substances in percentage by weight:
base oil: 50-60 percent;
anionic surfactant: 15 to 18 percent;
nonionic surfactant: 15 to 20 percent;
thickening agent: 0.01 to 0.05 percent;
corrosion inhibitor: 3 to 5 percent;
pH regulator: 1 to 3 percent;
water: and (4) the balance.
2. The drilling and grinding fluid for the long horizontal segment well as claimed in claim 1, which is characterized in that: the base oil is one of 60N, 100N and 150N.
3. The drilling and grinding fluid for the long horizontal segment well as claimed in claim 1, which is characterized in that: the anionic surfactant is one or a mixture of more of petroleum sodium sulfonate, ammonium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium hexadecyl benzene sulfonate.
4. The long horizontal segment well drilling and grinding fluid as claimed in claim 1, wherein: the nonionic surfactant is one of nonylphenol polyoxyethylene ether and fatty alcohol polyoxyethylene ether.
5. The long horizontal segment well drilling fluid as claimed in claim 4, wherein: the polyoxyethylene nonyl phenyl ether is NP-4 or NP-7, and the polyoxyethylene fatty alcohol is AEO-3 or AEO-5.
6. The drilling and grinding fluid for the long horizontal segment well as claimed in claim 1, which is characterized in that: the thickening agent is one of guanidine gum powder, hydroxypropyl guanidine gum, polyacrylamide and polyacrylamide sylvite.
7. The long horizontal segment well drilling fluid as claimed in claim 6, wherein: the molecular weight of the polyacrylamide is 500-1000 ten thousand.
8. The drilling and grinding fluid for the long horizontal segment well as claimed in claim 1, which is characterized in that: the corrosion inhibitor is one or a compound of morpholine and Mannich bases HJF-94; the pH regulator is diethanolamine.
9. A method for preparing a long-horizontal-section well drilling fluid, which is used for preparing the long-horizontal-section well drilling fluid as claimed in any one of claims 1 to 8, and is characterized in that: the method comprises the following steps:
respectively weighing the base oil, the anionic surfactant, the nonionic surfactant, the thickening agent and the corrosion inhibitor according to the weight percentage of the formula, uniformly stirring, heating to 60-80 ℃, then adding water with the formula amount, continuously stirring for 50-70min, finally adjusting the pH value of the system to 7-9 by adopting a pH regulator, and cooling to room temperature to obtain the brown oily drilling and grinding fluid.
10. A method for using a long-horizontal well drilling fluid, comprising the long-horizontal well drilling fluid according to any one of claims 1 to 8, wherein: the drilling and grinding fluid is diluted into a drilling and grinding dilution water solution with the mass concentration of 1-2% for use, and the specific use method comprises the following steps: in the construction process, drilling and grinding dilution water solution is pumped into a drilling and grinding pipe column from a ground pump set and flows out through a drill bit water hole, the drilling and grinding dilution water solution carries debris to return from an annular space between a shaft and a drill rod after drilling and grinding, and the return liquid is simply settled and filtered for recycling.
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| CN202111241700.6A CN115746802A (en) | 2021-10-25 | 2021-10-25 | Drilling and grinding fluid for long horizontal section well and preparation and application methods thereof |
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| CN202111241700.6A CN115746802A (en) | 2021-10-25 | 2021-10-25 | Drilling and grinding fluid for long horizontal section well and preparation and application methods thereof |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108843973A (en) * | 2018-05-31 | 2018-11-20 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of coiled tubing friction reducer and preparation method and application |
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- 2021-10-25 CN CN202111241700.6A patent/CN115746802A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843973A (en) * | 2018-05-31 | 2018-11-20 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | A kind of coiled tubing friction reducer and preparation method and application |
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