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Multi-stage blocking pressure-bearing plugging agent

A technology of plugging agent and plugging agent, which is applied in the field of multi-stage plugging and pressure-bearing plugging agent, which can solve the problems of inability to optimize and determine the formula of plugging agent, increase the uncertainty of successful construction, and reduce the success rate of plugging , to achieve the effects of wide applicability of plugging, shortening drilling time, improving plugging ability and pressure stabilizing ability

Active Publication Date: 2014-10-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bridging plugging is characterized by low cost and wide application, but its plugging success rate is low. The reason is that the bridging plugging material does not match the size and shape of the cracks in the leakage layer during the plugging process. If the particles of the plugging material are slightly larger than the pores of the leakage layer If the cracks or the shape of the cracks do not match the pores of the leakage layer, the plugging material will not easily enter the cracks, and will form accumulations on the surface of the leakage layer, but will not penetrate into the leakage layer
Therefore, in drilling engineering, because the fracture width and pore size of the lost formation cannot be accurately grasped, the formulation of the plugging agent cannot be optimized and determined, which increases the uncertainty of successful construction, reduces the success rate of plugging, and increases the drilling cycle , increased labor intensity

Method used

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  • Multi-stage blocking pressure-bearing plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Plugging agent 1: limestone particles 8-15 mesh 5%, 20-40 mesh 8%, 60-70 mesh 5%, bagasse 8%, polyacrylamide gel particles 8%, nut shell 5-8 mesh 6% , 10% of 10-20 mesh, 30% of plugging agent, 10% of mica powder of 5-7 mesh, 10% of 8-12 mesh, wherein the weight ratio of plugging agent components is: sulfonated asphalt 15%, lignin fiber 25%, superfine calcium carbonate 40%, lignite resin 20%.

[0023] Plugging slurry formula: 2000mL 8wt% sodium soil mud + 15wt% plugging agent 1;

[0024] The pressure bearing capacity of the plugging agent in this embodiment is: 7MPa (maximum pressure of the instrument) for a 2mm×1mm wedge-shaped seam mold.

Embodiment 2

[0026] Plugging agent 2: limestone particles 8-15 mesh 8%, 20-40 mesh 9%, 60-70 mesh 8%, bagasse 10%, polyacrylamide gel particles 10%, nut shell 5-7 mesh 10% , 9-12 mesh 5%, plugging agent 25%, mica powder 5-8 mesh 10%, 10-20 mesh 5%, wherein the weight ratio of plugging agent components is: sulfonated asphalt 25%, lignin fiber 20%, superfine calcium carbonate 40%, lignite resin 15%.

[0027] Plugging slurry formula: 2000mL 8wt% sodium soil mud + 15wt% plugging agent 2; the pressure bearing capacity of the plugging agent in this example: 7MPa for a 3mm×2mm wedge-shaped seam mold.

Embodiment 3

[0029] Plugging agent 3: limestone particles 8-15 mesh 10%, 20-40 mesh 10%, 60-70 mesh 10%, bagasse 10%, polyacrylamide gel particles 10%, nut shell 5-8 mesh 5% , 10-20 mesh 5%, plugging agent 20%, mica powder 5-7 mesh 15%, 8-12 mesh 5%, wherein the weight ratio of plugging agent components is: sulfonated asphalt 25%, lignin fiber 35%, superfine calcium carbonate 20%, lignite resin 20%.

[0030] Plugging slurry formula: 2000mL 8wt% sodium soil mud + 20wt% plugging agent 3;

[0031] The pressure bearing capacity of the plugging agent in this embodiment: 7MPa for a 4mm×3mm wedge-shaped seam mold.

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Abstract

The invention relates to a multi-stage blocking pressure-bearing plugging agent which can be applied to drilling construction of weak pressure-bearing zones of oil and gas fields. The plugging agent comprises the following components in percentage by weight: 18-30% of limestone particle, 8-10% of bagasse, 8-10% of delayed expanding gel granule, 10-20% of nutshell, 20-30% of blocking agent and 15-25% of mica powder, wherein the raw materials are uniformly mixed to prepare the multi-stage blocking pressure-bearing plugging agent. Rigid materials, plant fibers, expandable materials and adhesive materials of different particle grades are mixed according to a certain ratio to prepare the granular, fiber, flaky and expandable plugging material for solving the technical problems of seams, cracks and interlayer fault loss, the once success rate of plugging is high, and the pressure-bearing capability of stratum is effectively improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploration and drilling plugging, in particular to a multi-stage pressure-bearing plugging agent for malignant leakage, which can be used for drilling construction in weak pressure-bearing blocks of oil and gas fields. Background technique [0002] With the further deepening of oil and gas exploration and development, more and more drilling work has been done in strata with complex structures, bottom layers with developed fractures, and strata with narrow or negative safety density windows. When drilling in these strata with low pressure bearing capacity, downhole accidents such as lost circulation often occur , which has a huge impact on subsequent cementing operations. At present, the common method of plugging is mainly bridging plugging. Bridging plugging is characterized by low cost and wide application, but its plugging success rate is low. The reason is that the bridging plugging mater...

Claims

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Application Information

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IPC IPC(8): C09K8/42
CPCC09K8/426
Inventor 侯士立黄达全王伟忠田增艳刘光艳李广环张爱顺王磊磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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