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Temporary plugging workover fluid and preparation method thereof

A technology of workover fluid and expansion inhibitor, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve the problem of high water-absorbing resin expansion multiple, small temporary plugging layer pressure bearing capacity, and low temporary plugging success rate and other problems, to achieve the effects of easy degradation, improved pressure bearing capacity, and good pressure bearing capacity

Active Publication Date: 2020-07-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The water-absorbing resin has a large water-absorbing expansion multiple, and its strength decreases after water-absorbing expansion. The pressure-bearing capacity of the temporary plugging layer is small, the adaptable range is small, and the success rate of temporary plugging is low.

Method used

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  • Temporary plugging workover fluid and preparation method thereof
  • Temporary plugging workover fluid and preparation method thereof
  • Temporary plugging workover fluid and preparation method thereof

Examples

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preparation example Construction

[0048] In the preparation process of the flour balls, the amount of water added can be 30% to 35% of the weight of the wheat flour, so that the flour and the floating pearls can be mixed evenly and have plasticity.

[0049] In the preparation process of resin balls, the addition amount of isopropanol and silane coupling agent can be 20% to 25% and 2% to 3% of the weight of petroleum resin respectively. As an interface modifier, it can make the petroleum resin and the float more easily bonded together.

[0050] It should be noted that, in the embodiment of the present invention, the floating ball has a hollow structure, and the prepared flour balls and resin balls are also hollow structures, which makes the flour balls and resin balls have lower densities.

[0051] The diameter of the polyvinyl alcohol fiber can be 0.01 mm, 0.02 mm, 0.03 mm, etc., and the length can be 3 mm, 4 mm, 5 mm, etc.

[0052] Wherein, the water absorption ratio of the resin ball in the embodiment of th...

Embodiment 1

[0083]This embodiment provides a temporary plugging and workover fluid, which is prepared by the following method: add 95.87 parts by weight of tap water to the stirring tank, and slowly add 0.10 parts by weight of hydroxysulfite to the stirring tank through the feeding funnel under the stirring state. An aqueous solution of ethyl diphosphonic acid tetrasodium salt and amino trimethylene phosphonic acid pentasodium salt was stirred for 45 minutes. Wherein, the total mass percentage of tetrasodium salt of hydroxyethylene diphosphonic acid and pentasodium salt of aminotrimethylene phosphonic acid is 28%, tetrasodium salt of hydroxyethylene diphosphonic acid and pentasodium salt of aminotrimethylene phosphonic acid The mass ratio is 1:0.8. Under stirring conditions, 0.29 parts by weight of biopolymers with a molecular weight of 2 million to 6 million were added to the stirring tank, stirred for 2.2 hours, and the dynamic shear force of the mixed fluid was measured as 2 Pa by usin...

Embodiment 2

[0087] This embodiment provides a temporary plugging and workover fluid, which is prepared by the following method: add 92.99 parts by weight of tap water to the stirring tank, and slowly add 0.4 parts by weight of hydroxysulfite to the stirring tank through the feeding funnel under the stirring state. An aqueous solution of ethyl diphosphonic acid tetrasodium salt and amino trimethylene phosphonic acid pentasodium salt was stirred for 50 min. Wherein, the total mass percentage of hydroxyethylene diphosphonic acid tetrasodium salt and aminotrimethylene phosphonic acid pentasodium salt is 30%, hydroxyethylene diphosphonic acid tetrasodium salt and aminotrimethylene phosphonic acid pentasodium salt The mass ratio is 1:1.2. Under stirring conditions, add 0.4 parts by weight of a biopolymer with a molecular weight of 2 million to 6 million into the stirring tank, stir for 2.5 hours, and measure the dynamic shear force of the mixed fluid with a Marsh funnel for drilling fluid to be...

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Abstract

The invention discloses a temporary plugging workover fluid and a preparation method thereof, and belongs to the field of oilfield chemistry. The temporary plugging workover fluid comprises, based onthe total weight being 100 parts, 0.96-2.7 parts of flour balls, 0.48-1.35 parts of resin balls, 1.92-4.5 parts of an expansion inhibitor, 0.29-0.45 parts of a suspending agent, 0.19-0.27 parts of a fiber synergist, 0.10-0.41 parts of a scale inhibitor, 0.19-0.32 parts of a degradation agent and the balance of water. The flour balls are prepared by mixing wheat flour and floating beads in a mass ratio of 6: 4 to 7: 3, adding water, and performing mixing, extruding, cutting, forming and drying. The density of the flour balls is 0.97-1.02 g / cm<3>, and the particle size of the flour balls is 2-4mm. The resin balls are prepared by mixing petroleum resin and floating beads in a mass ratio of 7: 3 to 8: 3, adding isopropanol and a silane coupling agent, and performing mixing, extruding, cutting,forming and drying. The density of the resin balls is 0.97-1.02 g / cm<3>, and the particle size of the resin balls is 3-5mm. The fiber synergist is polyvinyl alcohol fiber, the diameter of the polyvinyl alcohol fiber is 0.01-0.03mm, and the length of the polyvinyl alcohol fiber is 3-5mm. The temporary plugging workover fluid can form a temporary plugging layer which is compact in structure and excellent in mechanical strength and pressure bearing capacity, and does not damage a reservoir.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a temporary plugging workover fluid and a preparation method thereof. Background technique [0002] The leakage of workover fluid into the formation (referred to as lost circulation) not only affects the normal production of the oil well, but also pollutes the reservoir, resulting in the loss of oil and gas production and economic loss to the oil field. The causes of lost circulation include: high reservoir permeability, loose rock cementation, and large pressure difference between the reservoir and the working fluid. In workover operations, the use of temporary plugging and workover fluid can form a temporary plugging layer in the reservoir to prevent lost circulation. [0003] Currently used temporary plugging and workover fluids include superabsorbent resin and water, which can form stagnant gel clusters in the reservoir, accumulate in the reservoir and block the pore throat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/514C09K8/5083C09K2208/18
Inventor 樊松林杨晓春董军郭元庆王小芳尹瑞新赵俊峰辉建超李秀丽
Owner PETROCHINA CO LTD
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