CN115926762A - Drilling fluid for nuclear magnetic logging while drilling and use method and application thereof - Google Patents
Drilling fluid for nuclear magnetic logging while drilling and use method and application thereof Download PDFInfo
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- CN115926762A CN115926762A CN202211475675.2A CN202211475675A CN115926762A CN 115926762 A CN115926762 A CN 115926762A CN 202211475675 A CN202211475675 A CN 202211475675A CN 115926762 A CN115926762 A CN 115926762A
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Abstract
The invention provides a nuclear magnetic logging while drilling fluid and a use method and application thereof. The drilling fluid comprises, by weight, 90-100 parts of water, 1-2 parts of sodium bentonite, 0.2-0.6 part of pH regulator, 0.2-0.3 part of tackifier, 1-7 parts of filtrate reducer, 0.2-0.3 part of coating inhibitor, 5-15 parts of inorganic salt inhibitor, 2-7 parts of polymer inhibitor, 1-7 parts of anti-collapse plugging agent, 1.5-2 parts of nano plugging agent, 2-4 parts of toughening modifier and weighting agent; the inorganic salt inhibitor comprises a combination of sodium chloride and potassium chloride; the polymer inhibitor comprises a polyamine inhibitor. According to the nuclear magnetic logging while drilling fluid provided by the invention, the specific proportion of the inorganic salt inhibitor and the polymer inhibitor is formed, and the drilling fluid is matched with other components, so that the stability of a well wall can be effectively maintained, the resistivity of a drilling fluid system is improved, and the accuracy of nuclear magnetic logging is improved.
Description
Technical Field
The invention belongs to the technical field of drilling fluid, and particularly relates to a nuclear magnetic logging while drilling fluid as well as a using method and application thereof.
Background
With the development of deep ancient and near oil fields in sea areas increasing, the nuclear magnetic resonance logging while drilling and high-salinity drilling fluid are necessary for the fine development of exploration operations. In the process of drilling permeable or micro-fractured stratum and coal bed, complex conditions such as instability of well wall and the like are easy to occur. At the present stage, the formula of the drilling fluid is often optimized on the premise of ensuring the stability of a well wall, and the system has higher chlorine concentration. In the process of on-site nuclear magnetic logging while drilling operation, the problem of reduction of signal-to-noise ratio can be caused by the high-salinity slurry, and the high accuracy of the logging data is challenged.
For example, CN112048289A discloses a high salinity water-based drilling fluid and a preparation method thereof. The high-salinity water-based drilling fluid comprises the following raw material components in parts by weight: 4-6 parts of organic bentonite; 2-4 parts of modified asphalt; 0.8-1.5 parts of salt-resistant copolymer; 0.5-1.5 parts of hydrolyzed polyacrylonitrile potassium salt; 2-3 parts of sulfonated lignite resin; 1-4 parts of a plugging agent while drilling; 0.2-0.5 part of coating agent; 0.5-1 part of defoaming agent; 0.3-0.5 part of sodium carbonate; 0.8 to 1 portion of sodium hydroxide and 95 to 105 portions of brine. The high-salinity water-based drilling fluid provided by the invention has the advantages of good colloid stability, strong salt erosion resistance, strong inhibition, good rheological property, excellent capability of suspending and carrying rock powder, and capability of meeting construction requirements. However, the concentration of the chloride ions in the drilling fluid is high, and the accuracy of nuclear magnetic logging is affected.
The nuclear magnetic resonance logging is to detect the fluid information in the stratum by adjusting the working frequency of the instrument and utilizing the physical phenomenon that hydrogen nuclei in the stratum can resonate in an external magnetic field and relax. Logging is carried out in the drilling fluid, the operation can be completed only when the working of an instrument reaches the specified transmitting power, and the requirement on the resistivity of the drilling fluid is met (the minimum resistivity of the drilling fluid is 0.02 omega-m). The nuclear magnetic resonance logging while drilling can detect the stratum before the filtrate of the drilling fluid invades, the recorded data is closer to the original stratum information, the evaluation accuracy is higher, and the field engineering requirement of the nuclear magnetic resonance logging while drilling is difficult to meet in a complex condition by a mode of filling the sealing slurry into the open hole section at the present stage.
Therefore, the development of a drilling fluid which can effectively maintain the stability of the well wall, has low resistivity and improves the nuclear magnetic logging accuracy is an urgent problem to be solved in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a nuclear magnetic logging while drilling fluid and a use method and application thereof. According to the nuclear magnetic logging while drilling fluid, the inorganic salt inhibitor is reduced, meanwhile, the specific proportion of the inorganic salt inhibitor and the polymer inhibitor in a specific combination is formed, and the use of other components is matched, so that the resistivity of the nuclear magnetic logging while drilling fluid is favorably improved and the data determination accuracy of the nuclear magnetic logging while drilling tool is improved on the premise that the stability of a well wall is ensured and mudstone and coal bed collapse is avoided. Meanwhile, the lubricating and drag reducing agent has better lubricating and drag reducing effects and can effectively reduce friction resistance; and the preparation method is simple, easy to operate and suitable for production.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a nuclear magnetic logging while drilling fluid which comprises, by weight, 90-100 parts of water, 1-2 parts of sodium bentonite, 0.2-0.6 part of pH regulator, 0.2-0.3 part of tackifier, 1-7 parts of filtrate reducer, 0.2-0.3 part of coating inhibitor, 5-15 parts of inorganic salt inhibitor, 2-7 parts of polymer inhibitor, 1-7 parts of anti-collapse plugging agent, 1.5-2 parts of nano plugging agent, 2-4 parts of mud cake toughening modifier and weighting agent; the inorganic salt inhibitor comprises a combination of sodium chloride and potassium chloride; the polymer inhibitor comprises a polyamine inhibitor.
According to the invention, the polyamine inhibitor is adsorbed between clay layers or on the surface with negative electricity through electrostatic interaction, so that the hydration dispersion and expansion of shale can be effectively inhibited, and the integrity of drill cuttings is kept; by reducing the dosage of the inorganic salt inhibitor and increasing the dosage of the polyamine inhibitor, the inorganic salt inhibitor and the polyamine inhibitor which are combined in a specific ratio are compounded, and meanwhile, the other components are used in a matched manner, so that the resistivity of a drilling fluid system is improved on the premise that the drilling fluid achieves the performance of a drilling fluid with high mineralization degree, and the accuracy of nuclear magnetic logging is improved; the drilling fluid has moderate viscosity and shearing force, low filtration loss, high rock debris rolling recovery rate, good performance of inhibiting hydration expansion and dispersion of rock samples and good stability of a well wall.
Preferably, the drilling fluid for nuclear magnetic logging while drilling comprises 90 to 100 parts of water by weight, such as 91 parts, 92 parts, 93 parts, 94 parts, 95 parts, 96 parts, 97 parts, 98 parts, 99 parts and the like.
Preferably, the drilling nuclear magnetic logging drilling fluid comprises 1-2 parts of sodium bentonite, for example, 1.1 part, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts and the like.
Preferably, the while-drilling nuclear magnetic logging drilling fluid comprises 0.2-0.6 parts of pH regulator, such as 0.25 part, 0.3 part, 0.35 part, 0.4 part, 0.45 part, 0.5 part, 0.55 part and the like.
Preferably, the nuclear magnetic logging while drilling fluid comprises 0.2 to 0.3 parts of tackifier, such as 0.21 part, 0.22 part, 0.23 part, 0.24 part, 0.25 part, 0.26 part, 0.27 part, 0.28 part, 0.29 part and the like.
Preferably, the drilling-while-drilling nuclear magnetic logging drilling fluid comprises 1-7 parts of fluid loss additive by weight, such as 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts, 5 parts, 5.2 parts, 5.4 parts, 5.6 parts, 5.8 parts, 6 parts, 6.4 parts, 6.8 parts and the like.
Preferably, the nuclear magnetic logging while drilling fluid comprises 0.2 to 0.3 parts of coating inhibitor, such as 0.21 part, 0.22 part, 0.23 part, 0.24 part, 0.25 part, 0.26 part, 0.27 part, 0.28 part, 0.29 part and the like.
Preferably, the nuclear magnetic logging while drilling fluid comprises 5 to 15 parts of inorganic salt inhibitor, for example, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, 10 parts, 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, 14.5 parts and the like.
Preferably, the nuclear magnetic logging while drilling fluid comprises 2 to 7 parts by weight of the polymer inhibitor, such as 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.4 parts, 4.8 parts, 5 parts, 5.4 parts, 5.8 parts, 6.2 parts, 6.6 parts and the like.
Preferably, the nuclear magnetic logging while drilling fluid comprises 1-7 parts by weight of the anti-collapse plugging agent, such as 1.2 parts, 1.6 parts, 2 parts, 2.4 parts, 2.6 parts, 3 parts, 3.2 parts, 3.6 parts, 4 parts, 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts, 5 parts, 5.2 parts, 5.4 parts, 5.6 parts, 5.8 parts, 6 parts, 6.2 parts, 6.4 parts, 6.6 parts, 6.8 parts and the like.
Preferably, the while-drilling nuclear magnetic logging drilling fluid comprises 1.5-2 parts of the nano plugging agent by weight, such as 1.51 parts, 1.52 parts, 1.53 parts, 1.54 parts, 1.56 parts, 1.58 parts, 1.6 parts, 1.62 parts, 1.64 parts, 1.66 parts, 1.68 parts, 1.7 parts, 1.72 parts, 1.74 parts, 1.76 parts, 1.78 parts, 1.8 parts, 1.82 parts, 1.84 parts, 1.86 parts, 1.88 parts, 1.9 parts, 1.92 parts, 1.94 parts, 1.96 parts, 1.98 parts and the like.
Preferably, the drilling nuclear magnetic logging drilling fluid comprises 2 to 4 parts of mud cake toughening modifier, such as 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3 parts, 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts, 3.5 parts, 3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts and the like.
The mass ratio of the inorganic salt inhibitor to the polymer inhibitor is preferably (4-6): 1, wherein the specific values in (4-6) can be, for example, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, and the like.
In the invention, when the inorganic salt inhibitor/polymer inhibitor is high, namely the dosage of the polymer inhibitor is too small, the resistivity of the drilling fluid is high, and the logging requirement is difficult to meet; when the amount of the polymer inhibitor is too high, the properties of the drilling fluid are not obviously changed, and the problem of high cost is caused.
Preferably, the mass ratio of potassium chloride to sodium chloride is (0.5-1): 1, wherein specific values in (0.5-1) may be, for example, 0.52, 0.54, 0.56, 0.58, 0.6, 0.62, 0.64, 0.66, 0.68, 0.7, 0.72, 0.74, 0.76, 0.78, 0.8, 0.82, 0.84, 0.86, 0.88, 0.9, 0.92, 0.94, 0.96, 0.98, and the like.
Preferably, the pH adjusting agent comprises sodium hydroxide and/or sodium carbonate.
Preferably, the viscosifier comprises a polyanionic cellulose.
In the invention, the polyanionic cellulose comprises high-viscosity polyanionic cellulose, so that the filtration loss of the water-based drilling fluid can be effectively reduced, and the viscosity of the drilling fluid can be improved.
Preferably, the fluid loss additive comprises a sulfonated phenolic resin and/or a lignite resin.
Preferably, the coating inhibitor comprises polyacrylamide.
The number average molecular weight of the polyacrylamide is preferably not less than 600 ten thousand, and may be, for example, 620 ten thousand, 640 ten thousand, 660 ten thousand, 680 ten thousand, 700 ten thousand, 720 ten thousand, 740 ten thousand, 760 ten thousand, 780 ten thousand, 800 ten thousand, 820 ten thousand, 840 ten thousand, 860 ten thousand, 880 ten thousand, 900 ten thousand, or the like.
In the invention, the polyacrylamide is partially hydrolyzed polyacrylamide.
Preferably, the anti-collapse blocking agent comprises sulfonated asphalt and/or synthetic resin.
Preferably, the nano blocking agent comprises polymeric microspheres and/or modified silica.
Preferably, the while-drilling nuclear magnetic logging drilling fluid further comprises 3-5 parts by weight of an acid-soluble temporary plugging agent, such as 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4 parts, 4.2 parts, 4.4 parts, 4.6 parts, 4.8 parts and the like.
Preferably, the acid-soluble temporary plugging agent comprises a combination of an acid-soluble temporary plugging agent A, an acid-soluble temporary plugging agent B and an acid-soluble temporary plugging agent C.
Preferably, the particle size of the acid-soluble temporary plugging agent a is 100 to 300 meshes (for example, 120 meshes, 140 meshes, 160 meshes, 180 meshes, 200 meshes, 220 meshes, 240 meshes, 260 meshes, 280 meshes and the like are possible), the particle size of the acid-soluble temporary plugging agent B is 300 to 400 meshes (for example, 310 meshes, 320 meshes, 330 meshes, 340 meshes, 350 meshes, 360 meshes, 370 meshes, 380 meshes, 390 meshes and the like are possible), and the particle size of the acid-soluble temporary plugging agent C is 1000 to 2000 meshes (for example, 1100 meshes, 1200 meshes, 1300 meshes, 1400 meshes, 1500 meshes, 1600 meshes, 1700 meshes, 1800 meshes, 1900 meshes and the like are possible).
Preferably, the acid-soluble temporary plugging agent includes 5 to 15% of acid-soluble temporary plugging agent a (for example, may be 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, etc.), 1 to 10% of acid-soluble temporary plugging agent B (for example, may be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, etc.), and 80 to 90% of acid-soluble temporary plugging agent C (for example, may be 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, etc.), in terms of mass percentage.
Preferably, the mud cake toughening modifier comprises an asphalt resin blocking agent.
In the invention, the mud cake toughening modifier can stabilize the well wall by reducing the filtration loss and the mud cake permeability.
Preferably, the weighting agent comprises barite.
Preferably, the weighting agent is used in an amount such that the density of the system is 1.3 to 1.35g/cm -3 For example, it may be 1.31g/cm -3 、1.32g/cm -3 、1.33g/cm -3 、1.34g/cm -3 And the like.
Preferably, the while-drilling nuclear magnetic logging drilling fluid further comprises 0.1-0.2 parts of flow pattern modifier, such as 0.12 part, 0.14 part, 0.16 part, 0.18 part and the like.
Preferably, the flow pattern modifier comprises xanthan gum.
Preferably, the while-drilling nuclear magnetic logging drilling fluid further comprises 1-1.5 parts by weight of an anti-balling lubricant, such as 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts and the like.
In the invention, the anti-balling lubricant is a surfactant mixture, can prevent the adsorption of a drilling solid phase on a drill bit, enables the drill bit to continuously contact a new stratum and prevents balling, thereby improving the drilling speed.
In the invention, the preparation method of the while-drilling nuclear magnetic logging drilling fluid comprises the following steps:
mixing water, sodium bentonite, a pH regulator, a tackifier, a filtrate reducer, a coating inhibitor, an inorganic salt inhibitor, a polymer inhibitor, an anti-collapse plugging agent, a nano plugging agent, a mud cake toughening modifier and a weighting agent to obtain the while-drilling nuclear magnetic logging drilling fluid.
Preferably, the blended material further comprises at least one of a flow pattern modifier, an acid soluble temporary plugging agent, or an anti-balling lubricant.
Preferably, the rotation speed of the mixing is 10000-15000 rpm, such as 11000rpm, 12000rpm, 13000rpm, 14000rpm and the like.
In a second aspect, the invention provides a method for using the while-drilling nuclear magnetic logging drilling fluid according to the first aspect, wherein the method for using the while-drilling nuclear magnetic logging drilling fluid comprises the following steps:
in the drilling process, the nuclear magnetic logging while drilling fluid and the new slurry are prepared into a new drilling fluid for use.
<xnotran> , , 90 ～ 100 ( 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 ), pH 0.2 ～ 0.6 ( 0.25 , 0.3 , 0.35 , 0.4 , 0.45 , 0.5 , 0.55 ), 0.2 ～ 0.3 ( 0.21 , 0.22 , 0.23 , 0.24 , 0.25 , 0.26 , 0.27 , 0.28 , 0.29 ), 1 ～ 7 ( 1.2 , 1.4 , 1.6 , 1.8 , 2 , 2.2 , 2.4 , 2.6 , 2.8 , 3 , 3.2 , 3.4 , 3.6 , 3.8 , 4 , 4.2 , 4.4 , 4.6 , 4.8 , 5 , 5.2 , 5.4 , 5.6 , 5.8 , 6 , 6.4 , 6.8 ), 0.2 ～ 0.3 ( 0.21 , 0.22 , 0.23 , 0.24 , 0.25 , 0.26 , 0.27 , 0.28 , 0.29 ), 2 ～ 3 ( 2.1 , 2.2 , 2.3 , 2.4 , 2.5 , 2.6 , 2.7 , 2.8 , 2.9 ), 1 ～ 7 ( 1.5 , 2 , 2.5 , 3 , 3.5 , 4.2 , 4.4 , 4.6 , 4.8 , 5 , 5.2 , 5.4 , 5.6 , 5.8 , 6 , 6.2 , 6.4 , 6.6 , 6.8 ), 1.5 ～ 2 ( 1.51 , 1.52 , 1.53 , 1.54 , 1.56 , 1.58 , 1.6 , 1.62 , 1.64 , 1.66 , 1.68 , 1.7 , 1.72 , 1.74 , 1.76 , 1.78 , 1.8 , 1.82 , 1.84 , 1.86 , 1.88 , 1.9 , 1.92 , 1.94 , 1.96 , </xnotran> 1.98 parts, etc.), 2 to 4 parts of mud cake toughening modifier (for example, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 2.7 parts, 2.8 parts, 2.9 parts, 3 parts, 3.1 parts, 3.2 parts, 3.3 parts, 3.4 parts, 3.5 parts, 3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts, etc.), 0.1 to 0.2 part of flow pattern modifier (for example, 0.12 part, 0.14 part, 0.9 part, etc.), 2 to 4 parts of mud cake toughening modifier (for example, 2.1 parts, 2.2 parts, 2.3 parts, 3.4 parts, 3.5 parts, 3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts, etc.), 0.1 to 0.2 part of flow pattern modifier (for example, 0.12 parts, 0.14 part, 2 parts, 3.9 parts, etc.),0.16 parts, 0.18 parts, etc.) and weighting agents; the dosage of the weighting agent ensures that the density of the system is 1.3-1.35 g/cm -3 (it may be, for example, 1.31g/cm -3 、1.32g/cm -3 、1.33g/cm -3 、1.34g/cm -3 Etc.).
Preferably, the mass ratio of the drilling fluid to the new slurry is (75-85) - (15-25), wherein the specific values in (75-85) can be, for example, 76, 77, 78, 79, 80, 81, 82, 83, 84 and the like; specific values in (15 to 25) may be, for example, 16, 17, 18, 19, 20, 21, 22, 23, 24, etc., and more preferably (80 to 85) to (20 to 25).
Preferably, the drilling process further comprises the step of supplementing water.
In the application method of the drilling fluid for nuclear magnetic logging while drilling, the content of chloride ions in a drilling fluid system is strictly controlled. The glue solution is prepared by fresh water, and the content of chloride ions is measured during the logging while drilling and is adjusted at any time. Free water is properly supplemented, so that the phenomenon that the concentration of chloride ions is increased due to the fact that the free water is volatilized at high temperature of the drilling fluid is prevented. And monitoring the resistivity during drilling, if the resistivity of the drilling fluid during drilling can not meet the requirement of nuclear magnetic logging while drilling, and optimizing the resistivity to meet the requirement by adopting a mode of replacing the well slurry with new slurry (without adding potassium chloride or sodium chloride) after drilling to the completion of drilling.
In a third aspect, the invention provides a nuclear magnetic logging while drilling fluid according to the first aspect and/or a use method according to the second aspect, for use in drilling a collapsible formation.
The numerical ranges set forth herein include not only the points recited above, but also any points between the numerical ranges not recited above, and are not exhaustive of the particular points included in the ranges for reasons of brevity and clarity.
Compared with the prior art, the invention has the beneficial effects that:
according to the nuclear magnetic logging while drilling fluid provided by the invention, the dosage of the inorganic salt inhibitor is reduced, the dosage of the polyamine inhibitor is increased, the inorganic salt inhibitor and the polyamine inhibitor which are specially combined are compounded in a specific proportion, and meanwhile, the other components are used in a matched manner, so that the resistivity of a drilling fluid system is improved on the premise that the performance of the high-salinity drilling fluid system is not damaged, and the accuracy of nuclear magnetic logging is improved; the problem of poor nuclear magnetic logging accuracy caused by reduction of the signal-to-noise ratio due to adoption of the high-salinity drilling fluid is solved; the drilling fluid is moderate in viscosity and shearing force, low in filtration loss, high in rock debris rolling recovery rate, good in inhibition of hydration expansion of rock samples and good in dispersing performance, and can well stabilize a well wall; and the preparation process is simple and can be produced and applied.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
In the present invention, the materials used in all examples and comparative examples are as follows:
potassium chloride: purchased from medium sea oil energy logistics, ltd;
sodium chloride: purchased from chemical Co., ltd, chikan south, zhanjiang city;
sodium bentonite: purchased from Weifang Weihua New Material science and technology Limited;
sodium carbonate: purchased from satell chemical products sales ltd, tianjin;
sodium hydroxide: purchased from chemical Co., ltd, chikan south, zhanjiang city;
high viscosity polyanionic cellulose: purchased from Zhonghai oilfield services, inc., under the product number PF-PAC HV;
sulfonated phenolic resin: purchased from Zhonghai oilfield services, inc., cat # PF-SMP HT;
lignite resin: purchased from Zhonghai oilfield services, inc., cat # PF-SPNH HT;
polyacrylamide: purchased from Zhonghai oilfield services, inc., cat # PF-PLH;
polyamine inhibitors: purchased from Zhonghai oilfield services, inc., cat # PF-UHIB;
xanthan gum: purchased from Zhonghai oilfield services, inc., cat # PF-XC;
sulfonated asphalt: purchased from Zhonghai oilfield services, inc., cat # PF-FT-1;
nano plugging agent: purchased from Zhonghai oilfield services, inc., cat # PF-Nseal;
asphalt resin blocking agent: purchased from Zhonghai oilfield services, inc., cat # PF-NRL;
anti-balling lubricant: purchased from Zhonghai oilfield services, inc., under the product number PF-HLUB;
barite: purchased from maozuo building materials ltd, lingshou county;
acid soluble temporary plugging agent: a combination of calcium carbonate having a particle size of 200 mesh (11%), 325 mesh (5%) and 1500 mesh (84%) was composed.
Example 1
The embodiment provides a nuclear magnetic logging while drilling fluid which comprises, by weight, 100 parts of water, 0.4 part of sodium hydroxide, 0.2 part of sodium carbonate, 1 part of sodium bentonite, 0.2 part of high-viscosity polyanionic cellulose, 5 parts of potassium chloride, 8 parts of sodium chloride, 3 parts of sulfonated phenolic resin, 3 parts of lignite resin, 0.3 part of polyacrylamide, 3 parts of polyamine inhibitor, 1.5 parts of anti-balling lubricant, 1.5 parts of sulfonated asphalt, 2 parts of nano plugging agent, 3 parts of asphalt resin plugging agent, 0.1 part of xanthan gum and barite; the barite is used in an amount such that the density of the system is 1.35g/cm -3 。
The embodiment provides a preparation method of the while-drilling nuclear magnetic logging drilling fluid, which specifically comprises the following steps:
according to the formula amount, under the condition that the rotating speed is 11000rpm, sodium hydroxide, sodium carbonate, sodium bentonite, potassium chloride, sodium chloride, high-viscosity polyanionic cellulose, sulfonated phenolic resin, lignite resin, xanthan gum, polyacrylamide, polyamine inhibitor, sulfonated asphalt, anti-balling lubricant, nano plugging agent and asphalt resin plugging agent are sequentially added into a drilling fluid slurry cup, and the density of a weighting system of barite for drilling fluid is 1.35g/cm 3 And fully stirring to obtain the while-drilling nuclear magnetic logging drilling fluid.
Example 2
The embodiment provides a nuclear magnetic logging while drilling fluid which comprises, by weight, 100 parts of water, 0.3 part of sodium hydroxide, 0.2 part of sodium carbonate, 2 parts of sodium bentonite, 0.25 part of high-viscosity polyanionic cellulose, 5 parts of potassium chloride, 6 parts of sodium chloride, 2 parts of sulfonated phenolic resin, 2 parts of lignite resin, 0.25 part of polyacrylamide, 2.7 parts of polyamine inhibitor, 1 part of anti-balling lubricant, 2 parts of sulfonated asphalt, 1.5 parts of nano plugging agent, 4 parts of asphalt resin plugging agent, 0.15 part of xanthan gum and barite; the barite is used in an amount such that the density of the system is 1.32g/cm -3 。
The embodiment provides a preparation method of the while-drilling nuclear magnetic logging drilling fluid, and the specific steps are the same as those in the embodiment 1.
Example 3
The embodiment provides a nuclear magnetic logging while drilling fluid which comprises, by weight, 100 parts of water, 0.2 part of sodium hydroxide, 0.2 part of sodium carbonate, 1.5 parts of sodium bentonite, 0.3 part of high-viscosity polyanionic cellulose, 4 parts of potassium chloride, 6 parts of sodium chloride, 3 parts of sulfonated phenolic resin, 4 parts of lignite resin, 0.2 part of polyacrylamide, 2.5 parts of polyamine inhibitor, 1 part of anti-balling lubricant, 1 part of sulfonated asphalt, 2 parts of nano plugging agent, 2 parts of asphalt resin plugging agent, 0.2 part of xanthan gum and barite; the barite is used in an amount such that the density of the system is 1.35g/cm -3 。
The embodiment provides a preparation method of the while-drilling nuclear magnetic logging drilling fluid, and the specific steps are the same as those in the embodiment 1.
Example 4
The embodiment provides a while-drilling nuclear magnetic logging drilling fluid which comprises, by weight, 100 parts of water, 0.4 part of sodium hydroxide, 0.2 part of sodium carbonate, 1 part of sodium bentonite, 0.2 part of high-viscosity polyanionic cellulose, 5 parts of potassium chloride, 7 parts of sodium chloride, 3 parts of sulfonated phenolic resin, 3 parts of lignite resin, 0.3 part of polyacrylamide, 2.5 parts of polyamine inhibitor, 1.5 parts of anti-balling lubricant, 1.5 parts of sulfonated asphalt, 2 parts of nano plugging agent, 4 parts of acid soluble temporary plugging agent, 3 parts of asphalt resin plugging agent, 3 parts of xanthan gum0.1 part of glue and barite; the barite is used in an amount to give a system density of 1.35g/cm -3 。
The embodiment provides a preparation method of the while-drilling nuclear magnetic logging drilling fluid, and the specific steps are the same as those in the embodiment 1.
Example 5
The implementation provides a nuclear magnetic logging while drilling fluid, which is different from the embodiment 1 only in that the total amount of the inorganic salt inhibitor and the polymer inhibitor is unchanged, the mass ratio of potassium chloride to sodium chloride is unchanged, the mass ratio of the inorganic salt inhibitor to the polymer inhibitor is 3.
Example 6
The implementation provides a nuclear magnetic logging while drilling fluid, which is different from the embodiment 1 only in that the total amount of the inorganic salt inhibitor and the polymer inhibitor is unchanged, the mass ratio of potassium chloride to sodium chloride is unchanged, the mass ratio of the inorganic salt inhibitor to the polymer inhibitor is 6.2.
Example 7
The implementation provides a nuclear magnetic logging while drilling fluid, which is different from the embodiment 1 only in that the total amount of the inorganic salt inhibitor is unchanged, the mass ratio of potassium chloride to sodium chloride is 1.2.
Example 8
The implementation provides a nuclear magnetic logging while drilling fluid, which is different from the embodiment 1 only in that the total amount of the inorganic salt inhibitor is unchanged, the mass ratio of potassium chloride to sodium chloride is 0.4.
Example 9
The implementation provides a nuclear magnetic logging while drilling fluid, which is different from the embodiment 4 only in that the acid-soluble temporary plugging agent is replaced by 200-mesh calcium carbonate with the same amount, and other components, the amount and the preparation method are the same as those in the embodiment 4.
Comparative example 1
Comparison of booksThe drilling fluid comprises, by weight, 100 parts of water, 0.4 part of sodium hydroxide, 0.2 part of sodium carbonate, 1 part of sodium bentonite, 0.1 part of high-viscosity polyanionic cellulose, 8 parts of potassium chloride, 12 parts of sodium chloride, 3 parts of sulfonated phenolic resin, 3 parts of lignite resin, 0.3 part of polyacrylamide, 1.5 parts of polyamine inhibitor, 1.5 parts of anti-balling lubricant, 1.5 parts of sulfonated asphalt, 2 parts of nano plugging agent, 3 parts of asphalt resin plugging agent, 0.1 part of xanthan gum and barite; the barite is used in an amount such that the density of the system is 1.35g/cm -3 。
The comparative example provides a preparation method of the high-temperature high-pressure water-based drilling fluid, which specifically comprises the following steps:
according to the formula amount, under the condition of the rotating speed of 11000rpm, sodium hydroxide, sodium carbonate, sodium bentonite, high-viscosity polyanionic cellulose, sulfonated phenolic resin, lignite resin, xanthan gum, polyacrylamide, polyamine inhibitor, sulfonated asphalt, anti-balling lubricant, nano plugging agent and asphalt resin plugging agent are added into a slurry cup of the drilling fluid in sequence, and the density of a barite weighting system for the drilling fluid is 1.35g/cm 3 And fully stirring to obtain the high-temperature high-pressure water-based drilling fluid.
Comparative example 2
The comparative example provides a nuclear magnetic logging while drilling fluid which differs from comparative example 1 only in that the nuclear magnetic logging while drilling fluid does not contain polyamine inhibitor, and other components, the amount and the preparation method are the same as those of comparative example 1.
Comparative example 3
This comparative example provides a nuclear magnetic logging while drilling fluid which differs from example 1 only in that the polyamine inhibitor was replaced with a polymeric alcohol (Jiangyu JY-009), and the other components, amounts, and preparation methods were the same as example 1.
Comparative example 4
The comparison example provides a nuclear magnetic logging while drilling fluid which is different from the drilling fluid in the example 1 only in that the mass ratio of potassium chloride to sodium chloride is unchanged, the content of the inorganic salt inhibitor is 4 parts, the content of the polyamine inhibitor is 12 parts, and other components, the using amount and the preparation method are the same as those in the example 1.
Performance testing
After the nuclear magnetic logging while drilling fluids provided in examples 1 to 9 and comparative examples 1 to 4 are fully sheared, the rheological property, the filtration loss, the rock debris rolling recovery rate and the drilling fluid resistivity of the drilling fluid before aging and after aging (at 130 ℃ for 16 hours) are tested, wherein the resistivity in table 1 is measured at normal temperature, and the resistivity in table 3 is the drilling fluid resistivity in a 130 ℃ downhole environment.
Specific test results are shown in table 1 (before aging), table 2 (after aging), and table 3 (drilling fluid resistivity in a 130 ℃ downhole environment):
TABLE 1 drilling fluid Performance of each formulation before aging
TABLE 2 drilling fluid Properties of each formulation after aging at 130 deg.C for 16h
TABLE 3 drilling fluid resistivity for each formulation at 130 deg.C
| Cl - (ppm) | Resistivity (omega. M) | |
| Example 1 | 72000 | 0.0203 |
| Example 2 | 70500 | 0.0211 |
| Example 3 | 71000 | 0.0206 |
| Example 4 | 71500 | 0.0208 |
| Example 5 | 73500 | 0.0192 |
| Example 6 | 78000 | 0.0175 |
| Example 7 | 76000 | 0.0183 |
| Example 8 | 75000 | 0.0189 |
| Example 9 | 72000 | 0.0203 |
| Comparative example 1 | 105000 | 0.0145 |
| Comparative example 2 | 81000 | 0.0166 |
| Comparative example 3 | 78500 | 0.0171 |
| Comparative example 4 | 66000 | 0.0213 |
As can be seen from tables 1, 2 and 3, the nuclear magnetic logging while drilling fluid provided by the invention can improve the resistivity of a drilling fluid system on the premise of not damaging the performance of a high salinity drilling fluid system by reducing the dosage of an inorganic salt inhibitor and increasing the dosage of a polyamine inhibitor, compounding the inorganic salt inhibitor and the polyamine inhibitor in a specific ratio by adopting a specific combination, and meanwhile, matching the use of other components, so as to improve the nuclear magnetic logging accuracy; the problem of poor nuclear magnetic logging accuracy caused by the reduction of the signal-to-noise ratio caused by the adoption of the high-salinity drilling fluid is solved; the drilling fluid is moderate in viscosity and shearing force, low in filtration loss, high in rock debris rolling recovery rate, good in inhibition of hydration expansion of rock samples and good in dispersing performance, and can well stabilize a well wall; and the preparation process is simple and can be produced and applied.
From examples 1 and 5 to 8, it is understood that the drilling fluid performance is poor when the mass ratio of the inorganic salt inhibitor to the polymer inhibitor is not within a specific range or the mass ratio of potassium chloride to sodium chloride is not within a specific range.
It can be seen from the above examples 1 and comparative examples that when the amount of the inorganic salt inhibitor is not specifically selected and mixed with the polymer inhibitor or no polyamine inhibitor, the drilling fluid performance is poor, and when the amount of the polyamine inhibitor is too high, the cost is high.
The invention provides a using method of the while-drilling nuclear magnetic logging drilling fluid, which comprises the following steps: during logging while drilling, monitoring the content of chloride ions in a drilling fluid system and the resistivity of the drilling fluid system, and properly supplementing water to prevent the drilling fluid from volatilizing free water at high temperature to cause the concentration of the chloride ions to be increased; and adding the prepared new slurry into a drilling fluid system, and optimizing the resistivity to meet the requirement in a mode of replacing well slurry by the new slurry.
The formula of the new slurry comprises, by weight, 100 parts of water, 0.4 part of sodium hydroxide, 0.2 part of sodium carbonate, 0.2 part of high-viscosity polyanionic cellulose, 3 parts of sulfonated phenolic resin, 3 parts of lignite resin, 0.3 part of polyacrylamide, 3 parts of polyamine inhibitor, 1.5 parts of sulfonated asphalt, 2 parts of nano plugging agent, 3 parts of asphalt resin plugging agent, 0.1 part of xanthan gum and barite; the barite is used in an amount such that the density of the system is 1.35g/cm -3 。
The nuclear magnetic logging while drilling fluid provided in example 1 and the new slurry are respectively prepared into a new drilling fluid according to the mass ratio of 82 (N-1), 80 (N-2) and 75 (N-3), and the rheological property, the filtration loss property, the rock debris rolling recovery rate and the drilling fluid resistivity of a downhole environment at 130 ℃ after 16h of aging of the drilling fluid are tested.
The specific test results are shown in table 4 (at 130 ℃, after 16h aging) and table 5 (drilling fluid resistivity in a downhole environment at 130 ℃):
TABLE 4
TABLE 5
As can be seen from tables 4 and 5, in the drilling fluid field use process, by replacing the well slurry with the new slurry, the viscosity and the shearing force of the drilling fluid system can be ensured to be moderate, the filtration loss is low, the rock debris rolling recovery rate is high, the well wall can be effectively stabilized, the resistivity of the drilling fluid system can be improved, the accuracy of nuclear magnetic logging drilling can be ensured, and when the content of the new slurry is more than or equal to 20%, the resistivity is more than or equal to 0.022 omega m, so that the field work requirement can be better met.
In conclusion, the nuclear magnetic logging while drilling fluid provided by the invention is beneficial to improving the resistivity of the nuclear magnetic logging while drilling fluid and improving the accuracy of data determination of the nuclear magnetic logging while drilling tool on the premise of ensuring the stability of a well wall and avoiding mudstone and coal bed collapse by reducing the inorganic salt inhibitor, forming a specific ratio of the inorganic salt inhibitor and the polymer inhibitor in a specific combination and matching with other components. Meanwhile, the lubricating and drag reducing agent has better lubricating and drag reducing effects and can effectively reduce friction resistance; and the preparation method is simple, easy to operate and suitable for production.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The nuclear magnetic logging while drilling fluid is characterized by comprising, by weight, 90-100 parts of water, 1-2 parts of sodium bentonite, 0.2-0.6 part of pH regulator, 0.2-0.3 part of tackifier, 1-7 parts of filtrate reducer, 0.2-0.3 part of coating inhibitor, 5-15 parts of inorganic salt inhibitor, 2-7 parts of polymer inhibitor, 1-7 parts of anti-collapse plugging agent, 1.5-2 parts of nano plugging agent, 2-4 parts of mud cake toughening modifier and weighting agent;
the inorganic salt inhibitor comprises a combination of sodium chloride and potassium chloride;
the polymer inhibitor comprises a polyamine inhibitor.
2. The nuclear magnetic logging while drilling fluid as claimed in claim 1, wherein the mass ratio of the inorganic salt inhibitor to the polymer inhibitor is (4-6) to 1;
preferably, the mass ratio of the potassium chloride to the sodium chloride is (0.5-1): 1.
3. The nuclear magnetic logging while drilling fluid of claim 1 or 2, wherein the pH modifier comprises sodium hydroxide and/or sodium carbonate;
preferably, the viscosifier comprises a polyanionic cellulose;
preferably, the fluid loss additive comprises a sulfonated phenolic resin and/or a lignite resin.
4. The nuclear magnetic logging while drilling fluid as claimed in any one of claims 1 to 3, wherein the coating inhibitor comprises polyacrylamide;
preferably, the number average molecular weight of the polyacrylamide is more than or equal to 600 ten thousand.
5. The nuclear magnetic logging while drilling fluid according to any one of claims 1 to 4, wherein the anti-collapse plugging agent comprises sulfonated asphalt and/or synthetic resin;
preferably, the nano plugging agent comprises polymer microspheres and/or modified silica;
preferably, the while-drilling nuclear magnetic logging drilling fluid further comprises 3-5 parts by weight of an acid-soluble temporary plugging agent;
preferably, the acid-soluble temporary plugging agent comprises a combination of acid-soluble temporary plugging agent a, acid-soluble temporary plugging agent B and acid-soluble temporary plugging agent C;
preferably, the particle size of the acid-soluble temporary plugging agent A is 100-300 meshes, the particle size of the acid-soluble temporary plugging agent B is 300-400 meshes, and the particle size of the acid-soluble temporary plugging agent C is 1000-2000 meshes;
preferably, the acid-soluble temporary plugging agent comprises, by mass, 5-15% of acid-soluble temporary plugging agent A, 1-10% of acid-soluble temporary plugging agent B and 80-90% of acid-soluble temporary plugging agent C.
6. The nuclear magnetic logging while drilling fluid as claimed in any one of claims 1 to 5, wherein the mud cake toughening modifier comprises an asphalt resin plugging agent;
preferably, the weighting agent comprises barite;
preferably, the weighting agent is used in an amount such that the density of the system is 1.3 to 1.35g/cm -3 。
7. The while-drilling nuclear magnetic logging drilling fluid according to any one of claims 1 to 6, wherein the while-drilling nuclear magnetic logging drilling fluid further comprises 0.1 to 0.2 parts by weight of a flow pattern modifier;
preferably, the flow pattern modifier comprises xanthan gum;
preferably, the while-drilling nuclear magnetic logging drilling fluid further comprises 1-1.5 parts of an anti-balling lubricant in parts by weight.
8. The use method of the nuclear magnetic logging while drilling fluid according to any one of claims 1 to 7, wherein the use method comprises the following steps:
during drilling, the nuclear magnetic logging while drilling fluid as claimed in any one of claims 1 to 7 is prepared into a new drilling fluid with new slurry for use.
9. The use method of claim 8, wherein the new slurry comprises, by weight, 90 to 100 parts of water, 0.2 to 0.6 part of pH regulator, 0.2 to 0.3 part of tackifier, 1 to 7 parts of filtrate reducer, 0.2 to 0.3 part of coating inhibitor, 2 to 3 parts of polymer inhibitor, 1 to 7 parts of anti-collapse plugging agent, 1.5 to 2 parts of nano plugging agent, 2 to 4 parts of mud cake toughening modifier, 0.1 to 0.2 part of flow pattern regulator and weighting agent;
the dosage of the weighting agent ensures that the density of the system is 1.3-1.35 g/cm -3 ；
Preferably, the mass ratio of the while-drilling nuclear magnetic logging drilling fluid to the new slurry is (75-85) to (15-25), and further preferably (80-85) to (20-25);
preferably, the drilling process further comprises the step of supplementing water.
10. Use of a nuclear magnetic logging while drilling fluid according to any one of claims 1 to 7 and/or a method of use according to claim 8 in drilling a collapsible formation.
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