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Temporary plugging object and temporary plugging object dispenser

A dispenser and core technology, which is applied to drilling compositions, chemical instruments and methods, wellbore/well components, etc., can solve the problems of low plugging success rate, production shutdown, large injection volume, etc., and meet the plugging requirements The effect of process technology requirements

Active Publication Date: 2020-11-10
北京斯迪莱铂油气技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional methods use chemical gel and / or solid plugging materials, which have a low plugging success rate and short effective time after general injection
In another field, during the long-term development of the oilfield, the tubing and casing are corroded, squeezed and deformed by the pressure in the reservoir, and the tubing and casing walls are damaged, resulting in low production efficiency or shutdown, and pressure caused by leaks in the later workover process. For problems such as well fluid loss, liquid chemical plugging agents are routinely used, with large injection volume, low compressive strength, and poor plugging effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Preparation of knot temporary plug

[0066] The wall thickness L of the simulated wellbore is 70 mm, the diameter r of the simulated plugged perforation is 30 mm, and the depth n of the core of the temporary plugging material embedded in the perforation is 5 mm. The maximum cross-sectional diameter R of the inner core of the temporary blockage is 30mm.

[0067] The acrylic cloth-like braid with a length of 10 cm and a width of 5 cm is used to make a spherical knot inner core with a diameter of 30 mm by cross-knotting.

[0068] After mixing 54g of 400-500 mesh nano-silica powder and 6g of 10wt% polyvinyl alcohol aqueous solution and stirring evenly, manually wrapping the outside of the inner core of the knot, then filling it into a spherical mold with an inner diameter of 5cm, and compacting it at 90 ℃ drying for 2 hours to obtain a semi-finished temporary plug wrapped with a wrapping layer.

[0069] After taking out the semi-finished temporary blockage, spray ammonium...

Embodiment 2

[0071] Preparation of knot temporary plug

[0072] The wall thickness L of the simulated wellbore is 70 mm, the diameter r of the simulated plugged perforation is 30 mm, and the depth n of the core of the temporary plugging material embedded in the perforation is 7 mm. According to the formula R=(L-n) / L*r, the maximum cross-sectional diameter of the inner core of the temporary blockage is R=27mm.

[0073] The acrylic fibers with a length of 20 m and an average diameter of 0.06 cm are used to make a spherical knot core with a diameter of 27 mm by cross-knotting.

[0074] After mixing 76g of 300-400 mesh nano-silica powder and 4g of 5% polyvinyl alcohol aqueous solution and stirring evenly, manually wrapping the outer core of the knot, then filling it into a spherical mold with an inner diameter of 5cm, compacting and forming it at 90 ℃ drying for 2 hours to obtain a semi-finished temporary plug wrapped with a wrapping layer.

[0075] After taking out the semi-finished tempora...

Embodiment 3

[0077] Preparation of knot temporary plug

[0078] The wall thickness L of the simulated wellbore is 50 mm, the diameter r of the simulated plugged perforation is 20 mm, and the depth n of the core of the temporary plugging material embedded in the perforation is 10 mm. According to the formula R=(L-n) / L*r, the maximum cross-sectional diameter of the inner core of the temporary blockage is R=16mm.

[0079] Spandex fibers with a length of 50 m and an average diameter of 0.03 cm were used to make a spherical knot core with a diameter of 16 mm by cross-knotting.

[0080] Use 95g of ultra-fine calcium chloride powder of 300-500 mesh and 5g of aqueous solution containing 1% polyvinyl alcohol to stir evenly, then wrap it manually outside the inner core of the knot, then fill it into a spherical mold with an inner diameter of 5cm, compact it and place it at 90°C Dry for 2 hours to obtain a semi-finished temporary plug wrapped with a wrapping layer.

[0081] After taking out the sem...

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Abstract

The invention provides an oil-gas well temporary plugging object and a temporary plugging object dispenser. The invention sequentially comprises a first inner core, a wrapping layer and a first surface waterproof layer from inside to outside, the first inner core is a rope knot, the first inner core is made of a soluble material and / or a degradable material, and the wrapping layer is made of a first filler and an optional first adhesive.

Description

technical field [0001] The invention provides an oil and gas well temporary blocking object and a temporary blocking object dispenser. Background technique [0002] Oil and gas well vertical well delamination, horizontal well segmentation, temporary plugging and repeated fracturing of old wells, plugging during drilling and leakage points during long-term production of oil and casing are common temporary plugging technology requirements in the oilfield development process, especially At present, plugging perforation holes to achieve layered or staged fracturing, temporary plugging technology has been widely used. Throwing temporary plugging balls are used, and the perforation holes are washed and polished by fracturing sand, resulting in hole diameter expansion and deformation. It is difficult for temporary plugging balls to effectively block irregular holes. , resulting in segmental or delamination failure, it is difficult to ensure the implementation of delamination or se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/516C09K8/50E21B33/12E21B23/00
CPCC09K8/516C09K8/50E21B33/1208E21B23/00
Inventor 程兴生张大年李永平任孝柯
Owner 北京斯迪莱铂油气技术有限公司
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