CN115216280B - Drilling fluid suitable for high-salt high-pressure stratum and preparation method thereof - Google Patents
Drilling fluid suitable for high-salt high-pressure stratum and preparation method thereof Download PDFInfo
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- CN115216280B CN115216280B CN202211012227.9A CN202211012227A CN115216280B CN 115216280 B CN115216280 B CN 115216280B CN 202211012227 A CN202211012227 A CN 202211012227A CN 115216280 B CN115216280 B CN 115216280B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention belongs to the technical field of drilling, and particularly relates to drilling fluid suitable for high-salt high-pressure stratum and a preparation method thereof. The drilling fluid comprises the following components in parts by weight: 1000 parts of water, 3 parts of bentonite, 0.2-0.4 part of filtrate reducer A, 0.2-0.5 part of filtrate reducer B, 0.5-1 part of anti-collapse plugging agent, 0.1-0.3 part of tackifier, 0.15-0.2 part of inhibitor, 0.2 part of lubricant, 0.2 part of NaOH and 20-27 parts of weighting agent. The drilling fluid has good performance and is suitable for construction drilling of high-salt high-pressure stratum.
Description
Technical Field
The invention belongs to the technical field of drilling, and particularly relates to drilling fluid suitable for high-salt high-pressure stratum and a preparation method thereof.
Background
The salt paste layer of China is widely distributed in North China, xinjiang, qinghai, chongqing, jiang Han, changqing and other areas. The salt paste layer of the Qidamu basin is buried deeply and has larger thickness, engineering accidents such as drilling sticking, hole collapse and the like are easily caused by plastic peristalsis of the salt rock layer in the geological drilling process, irregular well holes are formed, the quality of the well holes is influenced, and high technical difficulty and safety risk are brought to drilling operation. The drilling fluid is easy to be polluted when drilling into rock salt stratum, so that the drilling fluid loses viscosity and shear force, and normal operation cannot be maintained. Therefore, the safe and smooth construction of the rock salt stratum in the construction drilling of the stone beach area of the firewood basin is the biggest difficult problem in the area, and the design and maintenance of the drilling fluid system and the stability of the drilling fluid are one of key technologies of the construction drilling of the rock salt stratum.
In 2021, the unit of me constructs 4 holes in the area of the stone beach of the chaida basin, which amounts to 2437.87m. The construction process is common rotary drilling. Wherein the drilling holes ZKLH12-1 and ZKLH19-1 in the last half year are lack of construction experience due to lack of relevant geological data, and accidents in the holes of different degrees occur in the two holes. When the ZKLH19-1 is drilled to 472m, small-scale blowout occurs when the drilling meets shallow gas, the drilling continues to be performed until 510 m after the drilling is normal, and finally the drilling is stopped when the pressure in the drilling is higher and the construction risk is too high; when the ZKLH12-1 hole is constructed to 597m, a drill rod breaking accident occurs, the hole is moved for re-construction after 3 days of salvaging without fruits, the drill rod breaking accident occurs again when the new hole site is constructed to 695m, the hole is constructed for 51 days in a cumulative way, and the scrapped workload is 597m. Logging data indicated that both borehole apertures were enlarged to varying degrees, with the ZKLH12-1 borehole aperture enlargement rate reaching 145.34%. The two holes are connected to generate hole accidents, so that serious economic loss is brought to units, the geological prospecting progress is influenced, and a targeted drilling fluid research test is developed for the region.
The analysis shows that the prior use of the 'double-protection' mud in the stone ring beach area has the following problems: the analysis shows that the prior use of the 'double-protection' mud in the stone ring beach area has the following problems: the stratum has higher salinity, the drilling fluid is easy to invade by the salinity in the stratum, and the drilling fluid is layered and loses viscosity.
Disclosure of Invention
In order to solve the technical problems, the invention provides drilling fluid suitable for high-salt high-pressure stratum, which comprises the following components in parts by weight:
1000 parts of water, 3 parts of bentonite, 0.2-0.4 part of filtrate reducer A, 0.2-0.5 part of filtrate reducer B, 0.5-1 part of anti-collapse plugging agent and 0.1-0.3 part of tackifier;
the filtrate reducer A is acid-soluble polymer JT-I and acts as filtrate reducer and salt resistance;
the filtrate reducer B is hydrolyzed polyacrylonitrile ammonium salt HPAN and has the functions of reducing filtrate loss, reducing viscosity and resisting salt;
the anti-collapse plugging agent is water-dispersible emulsified asphalt powder GFT, and has the effects of plugging, reducing permeability and softening and bonding;
the tackifier is an anti-salt copolymer GTQ, and has the effects of improving viscosity and shear force, resisting salt and inhibiting clay hydration;
the weighting agent is barite powder.
Further, the drilling fluid also comprises 0.15-0.2 part of inhibitor, wherein the inhibitor is potassium polyacrylate K-PAM, and has the functions of inhibiting the dispersion of shale and drill cuttings and is used for shearing dilution and collapse flocculation prevention of a polymer system.
Further, the drilling fluid also comprises 0.2 part of lubricant, wherein the lubricant is grease graphite HX-B.
Further, the drilling fluid also comprises 20-27 parts of weighting agent, wherein the weighting agent is barite powder.
Further, the drilling fluid also comprises 0.2 part of NaOH.
A preparation method of drilling fluid suitable for high-salt high-pressure stratum comprises the following steps:
s1, mixing water and bentonite, preparing bentonite slurry, uniformly stirring, and standing for 20-24 hours;
s2, stirring bentonite slurry at a rotating speed of 8000-9000r/min, sequentially and slowly adding a filtrate reducer A, a filtrate reducer B, an anti-collapse plugging agent, a tackifier, an inhibitor, a lubricant and a weighting agent in the stirring process, and finally adding NaOH, and stirring for 10-15min.
Compared with the prior art, the invention has the following beneficial effects:
1) The drilling fluid has good wall building and protecting performance. The flushing fluid has lower filtration loss, so that the influence of hydration on the rock salt stratum is reduced; meanwhile, the wall of the hole is reinforced by stronger plugging and bonding effects, thin and compact mud skin is formed on the wall of the hole, and the stable wall of the hole can be effectively protected.
2) Has good rheological property, prevents scaling on the inner wall of a drill rod, and excessive pumping pressure and exciting pressure of the drill rod.
3) Has good lubricating performance. The adhesive coefficient is small, the friction resistance can be effectively reduced, the rotation resistance is reduced, the sticking of drilling tools is prevented, the consumption of power and materials is reduced, and the service life of drilling tools is prolonged.
4) Has good performance of carrying rock powder, cleaning hole bottoms and cooling drill bits.
5) The anti-salt-invasion capability is provided, and the invasion of rock salt stratum to drilling fluid is reduced to the greatest extent.
6) The drilling fluid has enough specific gravity, can balance shallow air pressure, and avoids drill sticking accidents caused by the overflow of air pressure and the damage of the well wall in the hole, and the falling of the unstable stratum at the upper part.
Detailed Description
The present invention will be described in detail with reference to specific examples, but should not be construed as being limited thereto. Unless otherwise indicated, the technical means used in the following examples are conventional means well known to those skilled in the art, and the materials, reagents, etc. used in the following examples are commercially available unless otherwise indicated.
The following examples relate to materials:
the filtrate reducer A is acid-soluble polymer JT-I;
the filtrate reducer B is hydrolyzed polyacrylonitrile ammonium salt HPAN;
the collapse preventing plugging agent is water dispersed emulsified asphalt powder GFT;
the tackifier is an anti-salt copolymer GTQ;
the inhibitor is potassium polyacrylate K-PAM;
the lubricant is grease graphite HX-B;
the weighting agent is barite powder.
Example 1
A drilling fluid suitable for use in high-salinity and high-pressure formations, comprising the following components:
1000kg of water, 3kg of bentonite, 0.2kg of filtrate reducer A, 0.2kg of filtrate reducer B, 0.5kg of anti-collapse plugging agent, 0.1kg of tackifier, 0.15kg of inhibitor, 0.2kg of lubricant, 0.2kg of NaOH and 20kg of weighting agent.
The preparation method of the drilling fluid comprises the following steps:
s1, mixing water and bentonite to prepare bentonite slurry, fully and uniformly stirring, and standing for 24 hours;
s2, stirring bentonite slurry at a high speed of 9000r/min, sequentially and slowly adding the filtrate reducer A, the filtrate reducer B, the collapse preventing plugging agent, the tackifier, the inhibitor, the lubricant and the weighting agent in the stirring process, and finally adding NaOH and stirring for 15min.
Example 2
A drilling fluid suitable for use in high-salinity and high-pressure formations, comprising the following components:
1000kg of water, 3kg of bentonite, 0.3kg of filtrate reducer A, 0.4kg of filtrate reducer B, 0.8kg of anti-collapse plugging agent, 0.2kg of tackifier, 0.18kg of inhibitor, 0.2kg of lubricant, 0.2kg of NaOH and 25kg of weighting agent.
The drilling fluid was prepared in the same manner as in example 1.
Example 3
A drilling fluid suitable for use in high-salinity and high-pressure formations, comprising the following components:
1000kg of water, 3kg of bentonite, 0.4kg of filtrate reducer A, 0.5kg of filtrate reducer B, 1kg of anti-collapse plugging agent, 0.3kg of tackifier, 0.2kg of inhibitor, 0.2kg of lubricant, 0.2kg of NaOH and 27kg of weighting agent.
The drilling fluid was prepared in the same manner as in example 1.
The properties of the drilling fluids prepared in examples 1-3 above were measured according to conventional methods and the results are shown in Table 1.
Table 1 performance parameters of drilling fluids prepared in examples 1-3
The apparent viscosity of the prepared drilling fluid is controlled to be 19 mPas, the plastic viscosity is 16 mPas, the dynamic shear force is 3.06Pa, the dynamic plastic ratio is 0.19 Pa/mPas, and the density is 1.20-1.25 g/cm 3 ，PH8～10。
Application example 1
The two holes ZKLH8-1 and ZKLH2-1 in the stone beach area of the Qidamu basin in the embodiment 2 of the invention are subjected to field test application, the two-hole core sampling rate reaches about 90%, the test drilling fluid obtains good application effect, and no hole accidents occur.
1. Two ZKLH19-1 and ZKLH12-1 are drilled in the first half year of 2021 in the stone ring beach area, 4 holes are drilled in other units in the vicinity of 3km, and the platform month efficiency is relatively low. Holes are drilled in the region for 2 times in the next half year 2021, and the efficiency of the platform month is obviously improved. The efficiency of ZKLH8-1 holes per month reaches 1262.86 m/month, the efficiency of ZKLH2-1 holes per month reaches 1638.82 m/month, the construction efficiency is improved by about 146%, and specific data are shown in Table 2.
Table 2 list of drilling efficiency for stone ring beach drilling
2. Well quality enhancement
The hole diameter of the full hole is overlarge due to the defect of preparation of drilling fluid, the hole wall is not protected, the water consumption of 600 meters of work load is up to 400, and the hole diameter expansion rate reaches 126.59% -145.34%. After the drilling fluid is improved, the construction is completed by only 40 parts of water, the expansion rate of the ZKLH8-1 hole diameter is 24.3%, and the expansion rate of the ZKLH2-1 hole diameter is 14.5%.
3. Cost reduction of slurry materials
And (3) carrying out data statistics on the consumption mud materials of two drilling fluid systems, and analyzing the single-hole running cost condition. The data show that the drilling fluid is more selected from high molecular polymer mud materials after improvement, the drilling fluid is not easy to be polluted by stratum, and compared with the prior drilling fluid system single hole, the drilling fluid system single hole can save half of mud materials and water cost.
It should be noted that, when the claims refer to numerical ranges, it should be understood that two endpoints of each numerical range and any numerical value between the two endpoints are optional, and the present invention describes the preferred embodiments for preventing redundancy.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (2)
1. The drilling fluid suitable for the high-salt high-pressure stratum is characterized by being prepared from the following components in parts by weight:
1000 parts of water, 3 parts of bentonite, 0.3 part of filtrate reducer A, 0.4 part of filtrate reducer B, 0.8 part of anti-collapse plugging agent, 0.2 part of tackifier, 0.18 part of inhibitor, 0.2 part of lubricant, 25 parts of weighting agent and 0.2 part of NaOH;
the filtrate reducer A is an acid-soluble polymer JT-I;
the filtrate reducer B is hydrolyzed polyacrylonitrile ammonium salt HPAN;
the collapse prevention plugging agent is water-dispersible emulsified asphalt powder GFT;
the tackifier is an anti-salt copolymer GTQ;
the inhibitor is potassium polyacrylate K-PAM;
the lubricant is grease graphite HX-B;
the weighting agent is barite powder.
2. A method of preparing a drilling fluid suitable for use in a high-salinity, high-pressure formation of claim 1, comprising the steps of:
s1, mixing water and bentonite, preparing bentonite slurry, uniformly stirring, and standing for 20-24 hours;
s2, stirring bentonite slurry at a rotating speed of 8000-9000r/min, sequentially and slowly adding a filtrate reducer A, a filtrate reducer B, an anti-collapse plugging agent, a tackifier, an inhibitor, a lubricant and a weighting agent in the stirring process, and finally adding NaOH, and stirring for 10-15min.
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| CN114456780A (en) * | 2020-11-10 | 2022-05-10 | 中国石油化工股份有限公司 | High-temperature high-density anti-sloughing drilling fluid composition, drilling fluid thereof, preparation method and application |
| CN114605972A (en) * | 2020-12-07 | 2022-06-10 | 中国石油化工股份有限公司 | Strong-plugging anti-sloughing drilling fluid for stratum in broken zone and preparation method and application thereof |
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| EP1431368A1 (en) * | 2002-12-18 | 2004-06-23 | Eliokem | Fluid loss reducer for high temperature high pressure water-based mud application |
| CN102604604B (en) * | 2012-02-06 | 2014-01-29 | 北京探矿工程研究所 | Drilling fluid material and preparation and application thereof |
| CN106639933B (en) * | 2016-08-31 | 2019-04-19 | 中国石油集团渤海钻探工程有限公司 | The processing method of the height drilling fluid of block containing saline bed |
| CN106958422A (en) * | 2017-04-14 | 2017-07-18 | 河南省煤田地质局队 | A kind of drill bit and boring method of sylvite ore drilling operation |
| CN108774504B (en) * | 2018-08-07 | 2021-06-18 | 中国石油天然气集团有限公司 | Water-based drilling fluid suitable for salt-gypsum layer and preparation method thereof |
| CN110938415B (en) * | 2019-12-02 | 2021-10-19 | 西南石油大学 | Micro-nano plugging anti-collapse drilling fluid and preparation method and application thereof |
| CN112322261A (en) * | 2020-12-16 | 2021-02-05 | 新疆华油能源工程服务有限公司 | Strong-inhibition non-permeable anti-sloughing drilling fluid and preparation method thereof |
| CN114045158B (en) * | 2022-01-14 | 2022-03-18 | 北京培康佳业技术发展有限公司 | Organic salt drilling fluid resistant to temperature of 250 ℃ and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114456780A (en) * | 2020-11-10 | 2022-05-10 | 中国石油化工股份有限公司 | High-temperature high-density anti-sloughing drilling fluid composition, drilling fluid thereof, preparation method and application |
| CN114605972A (en) * | 2020-12-07 | 2022-06-10 | 中国石油化工股份有限公司 | Strong-plugging anti-sloughing drilling fluid for stratum in broken zone and preparation method and application thereof |
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