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CN-122012047-A - Temperature response cementing and plugging composition for well drilling pressure-bearing plugging and preparation and use methods thereof

CN122012047ACN 122012047 ACN122012047 ACN 122012047ACN-122012047-A

Abstract

The invention relates to a temperature response cementing plugging composition for well drilling pressure-bearing plugging, and a preparation method and a use method thereof, wherein the plugging composition utilizes the temperature response polymer sensitivity to temperature and oil/water resistance, enhances the retention capacity of plugging particles in cracks, and in addition, the particle size distribution range of plugging particles is optimized, so that the plugging effect is further improved, the existing cementing plugging material can effectively plug 3mm cracks at 150 ℃, the pressure bearing of 9.8 MPa is plugged, the highest pressure bearing of the consolidation plugging material is 14MPa, and compared with the existing plugging material, the plugging composition can effectively plug 5mm cracks at 60-100 ℃, and the highest pressure bearing of 28MPa, has the characteristics of higher pressure bearing capacity and wider plugging crack range, so that the problem of drilling fluid leakage can be better solved.

Inventors

  • YAN JING
  • WU HAN
  • QI YUE
  • SONG TAO
  • ZHANG YANG
  • ZHANG KUN
  • YU XINGDONG
  • JIA XINPENG
  • SUN WENRUI
  • Pang Haixu

Assignees

  • 大庆钻探工程有限公司
  • 中国石油天然气集团有限公司

Dates

Publication Date
20260512
Application Date
20241031

Claims (12)

  1. 1.A temperature responsive cement plugging composition for pressure bearing plugging of a well comprising: plugging particles and temperature responsive polymers; after lost circulation, before the response temperature, the polymer bridges in the leakage channel, and after the response temperature is reached, the polymer changes into a liquid state and is used for adhering the plugging particles together so as to plug the leakage channel; the response temperature corresponds to a bottom hole temperature.
  2. 2. The temperature responsive cementing and plugging composition for well drilling pressure bearing plugging of claim 1 wherein: the temperature responsive polymer is a thermoplastic, rubber or thermoplastic elastomer.
  3. 3. The temperature responsive cementing and plugging composition for well drilling pressure bearing plugging of claim 2 wherein: the thermoplastic plastic is selected from one or more of ethylene-vinyl acetate copolymer, polyethylene, polypropylene, polyurethane, polyamide and polyacrylamide.
  4. 4. The temperature responsive cementing and plugging composition for well drilling pressure bearing plugging of claim 2 wherein: The thermoplastic elastomer is selected from one or more of thermoplastic polyurethane elastomer, styrene slug thermoplastic elastomer, thermoplastic polyester elastomer and thermoplastic polyolefin elastomer.
  5. 5. The temperature responsive cementing and plugging composition for well drilling pressure bearing plugging of claim 2 wherein: The rubber is nitrile rubber and organic silicon rubber.
  6. 6. A temperature responsive cement plugging composition for well drilling pressure plugging according to any one of claims 1-5 wherein: The plugging particles comprise particles with the particle size of W being more than or equal to d >2/3W, wherein the particle size is more than or equal to d >2/3W, the particle size is more than or equal to 10%, the particle size is more than or equal to 2/3W, the particle size is more than or equal to d > 1/3W, the particle size is more than or equal to 65%, the particle size is less than or equal to d <1/3W, the particle size is more than or equal to 25%, and the particle size is more than or equal to the filling particle, wherein W is the width of a leakage channel.
  7. 7. The temperature responsive cementing and plugging composition for well drilling pressure bearing plugging of claim 6 wherein: The particle size distribution of the plugging particles meets the requirement that W is more than or equal to D 90 ≥2/3W,D 25 is more than or equal to 1/3W.
  8. 8. The temperature responsive cementing and plugging composition for well drilling pressure bearing plugging of claim 7 wherein: the plugging particles comprise walnut shells, vermiculite, mica, graphite, superfine calcium carbonate and polyurethane foam.
  9. 9. The temperature responsive cementing composition for well drilling pressure plugging of claim 8 wherein: the particle size of the walnut shells, the vermiculite and the mica is 2-40 meshes, the particle size of the graphite and the superfine calcium carbonate is 400-800 meshes and 800-1250 meshes, and the volume of the polyurethane foam is 0.25-0.5mmx0.25-0.5mmm.
  10. 10. A method of preparing a temperature responsive cementitious plugging composition for pressure bearing plugging of a well as defined in any one of claims 1-9 comprising: And uniformly mixing the plugging particles with the temperature-responsive polymer to obtain the plugging composition.
  11. 11. A method of using the temperature responsive cement plugging composition for pressure bearing plugging of a well as defined in any one of claims 1-9, comprising: selecting a temperature responsive polymer based on the bottom hole temperature and the oiliness or water-based property of the drilling fluid system; and selecting plugging particles according to the width of the leakage channel.
  12. 12. The method of using a temperature responsive cementing and plugging composition for pressure bearing plugging of a well according to claim 11 wherein: The oil-based drilling fluid system with the bottom hole temperature of above 60 ℃ selects the temperature response polymer to be ethylene-vinyl acetate copolymer, the water-based drilling fluid system with the temperature response polymer of 80-100 ℃ to be ethylene-vinyl acetate copolymer, and the water-based drilling fluid system with the temperature of above 100 ℃ to be thermoplastic elastomer.

Description

Temperature response cementing and plugging composition for well drilling pressure-bearing plugging and preparation and use methods thereof Technical Field The present disclosure relates to the technical field of petroleum drilling engineering, and in particular to a drilling pressure-bearing plugging material. Background The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. Lost circulation is a phenomenon that drilling fluid leaks into a drilled stratum in a large amount in the drilling construction process, and is one of the most common and difficult-to-handle complex accidents of drilling engineering of complex stratum. The problems of serious leakage, leakage and overflow of the same layer, leakage and return loss and the like often occur in a crack development stratum, a broken stratum, a stratum with a narrow or negative safety density window and the like. The measure adopted when the leakage occurs is that firstly, the displacement is reduced to observe the leakage speed, then the leakage modes such as the leakage while drilling, the static leakage, the solidification leakage and the like are selected according to the leakage condition, and the leakage amount of the drilling fluid is reduced until the drilling fluid stops leaking. Typically, while drilling lost circulation is used to treat low and medium lost circulation, and static lost circulation and curing lost circulation is used to treat medium lost circulation, severe lost circulation, and lost circulation. The static plugging particles are used for plugging the stratum which is sensitive to stratum pressure such as cracking or fragility, and the plugging effect is influenced by factors such as bridging material grading, bridging slurry concentration, extrusion-replacement pressure during construction and the like, so that the problems of 'sealing a door', unstable plugging, repeated leakage and the like are easily caused, and the plugging efficiency is influenced. The safety risk of the solidification plugging construction is high, and the solidification plugging construction is easy to be polluted or diluted by high-mineralization stratum water, so that the retention capacity is poor. It should be noted that the information disclosed in the foregoing background section is only for enhancing understanding of the background of the present disclosure, and thus may contain information that does not constitute prior art. Disclosure of Invention In view of the above, the disclosure provides a temperature response cementing and plugging composition for well drilling pressure-bearing plugging, and a preparation method and a use method thereof, which solve the problems that the stationary plugging particles for severe leakage and lost-back leakage are influenced by multiple factors and have plugging failure, and the curing plugging has high construction safety risk. The invention relates to a temperature response cementing plugging composition for well drilling pressure-bearing plugging, which comprises the following technical conception: The composition consists of plugging particles and temperature response adhesive materials, wherein the plugging particles comprise walnut shells, vermiculite, mica, graphite, calcium carbonate and polyurethane foam, different mesh numbers are selected according to the opening degree of cracks, the walnut shells, the vermiculite, the mica, the graphite, the calcium carbonate and the polyurethane foam are utilized to bridge, clamp throats, fill and tie the joints in leakage channels to suspend and reside in the leakage channels to form a compact plugging layer, after the leakage occurs, the adhesive materials have the bridging function before the temperature response, the adhesive materials play a role after the temperature response, and are in an adhesive state, and are adhered with the walnut shells, the vermiculite, the mica, the polyurethane foam, the graphite and the calcium carbonate, so that the plugging particles are retained, the plugging effect of the plugging layer is improved, and the occurrence of 'door sealing', unstable plugging and repeated leakage accidents is avoided. Based on the technical conception of the invention, in order to achieve the aim of the invention, the temperature response cementing and plugging composition for well drilling pressure bearing and plugging comprises: plugging particles and temperature responsive polymers; after lost circulation, before the response temperature, the polymer bridges in the leakage channel, and after the response temperature is reached, the polymer changes into a liquid state and is used for adhering the plugging particles together so as to plug the leakage channel; the response temperature corresponds to a bottom hole temperature. In the present disclosure and possible embodiments, the temperature responsive polymer is a thermoplastic, rubber, or thermoplastic elastomer.