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Reinforced anti-swelling efficient sand-carrying fluid for sand prevention and yield increase measures of sensitive oil and gas reservoirs

A technology for oil and gas reservoirs and sand-carrying fluids, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of formation pollution of sensitive oil reservoirs, swelling of clay minerals, etc., to solve large-scale pollution and controllable filtration loss , Improve the effect of the transformation effect

Pending Publication Date: 2022-01-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide an enhanced anti-swelling and high-efficiency sand-carrying fluid for sand control in sensitive heavy oil reservoirs, which solves the problem of large-scale pollution and triggering of sand-carrying fluids used in the sand control construction process of the prior art to sensitive reservoir formations. Clay Mineral Swelling Problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] S1, preparation of quaternary ammonium viscoelastic surfactant: at 100×10 3 Add 20 tons of erucic acid and 30 tons of N,N-dimethyl-1,3-propanediamine to L xylene solvent and mix them, add 0.2 tons of fluoboric acid as a catalyst, and perform a condensation reaction at 130 degrees Celsius for 6 Hour, obtain betaine viscoelastic surfactant.

[0032] S2. Prepare enhanced anti-expansion and high-efficiency sand-carrying fluid 500×10 3 L: take the viscoelastic surfactant prepared in step S1 25×10 3 L, concentration is 2% sodium chloride solution 5×10 3 L, concentration is 3% HD-1 hydration retarder 25×10 3 L, the clay stabilizer (K-2 and HBD-911 mass ratio is 1:1) 15 * 10 that concentration is 3wt% 3 L in a container, add water to the container to 500×10 3 L, stir evenly to obtain enhanced anti-swelling and high-efficiency sand-carrying fluid.

[0033] Project case: Well No. 1 in Jinjia Oilfield, using the enhanced anti-swelling and high-efficiency sand-carrying fluid ...

Embodiment 2

[0036] The viscoelastic surfactant prepared in step S1 in Example 1 was used. Take viscoelastic surfactant 1×10 3 L, concentration is 2wt% sodium acetate solution 1.5 * 10 3 L. HD-1 hydration delay agent with a concentration of 3% 1×10 3 L, a clay stabilizer with a concentration of 3wt% (K-2 and HBD-911 mass ratio is 2:3) 2 × 10 3 L is placed in a container, and water is added to the container to 100×10 3 L, stir evenly to obtain enhanced anti-swelling and high-efficiency sand-carrying fluid.

[0037] Project case: Well No. 2 in Jinjia Oilfield, using the enhanced anti-swelling and high-efficiency sand-carrying fluid of this embodiment for sand control construction, pumping enhanced anti-swelling and high-efficiency sand-carrying fluid 100×10 3 L, 0.425~0.85mm ceramsite sand 14m 3 , the sand ratio is 5% to 50%, the construction pressure is 5 to 17.16MPa, and the displacement is 1.5 to 2.5m 3 / min, the average daily liquid at the initial stage of sand control well opening...

Embodiment 3

[0040] The viscoelastic surfactant prepared in step S1 in Example 1 was used. Take viscoelastic surfactant 2.5×10 3 L, concentration are 2wt% sodium chloride solution 3.4 * 10 3 L, concentration is 3% HD-1 hydration retarder 1.7×10 3 L, a clay stabilizer with a concentration of 3wt% (the mass ratio of K-2 and HBD-911 is 1:1) 4×10 3 L is placed in a container, add water to the container to 170×10 3 L, stir evenly to obtain enhanced anti-swelling and high-efficiency sand-carrying fluid.

[0041] Project case: Well No. 3 in Jinjia Oilfield, using the enhanced anti-swelling and high-efficiency sand-carrying fluid of this embodiment for sand control construction, pumping enhanced anti-swelling and high-efficiency sand-carrying fluid 170×10 3 L, 0.425~0.85mm quartz sand 15m 3 , the sand ratio is 5% to 25%, the construction pressure is 5 to 14MPa, and the displacement is 2.6m 3 / min, the average daily liquid at the initial stage of sand control well opening was 23.1t / d, the dai...

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Abstract

The invention relates to the field of oilfield exploitation, in particular to enhanced anti-swelling efficient sand-carrying fluid for sand prevention and yield increase measures of sensitive oil and gas reservoirs. The enhanced anti-swelling efficient sand-carrying fluid comprises the following components in percentage by volume: 0.5%-1.5% of a viscoelastic surfactant, 1%-0.5% of inorganic salt, 0.5%-1.5% of a hydration retarder, 2%-3% of a clay stabilizer and the balance of water. The enhanced anti-swelling efficient sand-carrying fluidcan play a role of prepad fluid and also can play a role of fracturing fluid, has the characteristics of temperature resistance, shearing resistance, low friction resistance, easiness in sand carrying, good gel breaking property, no damage to strata and the like, improves the transformation effect of the fracturing sand-prevention measure to the greatest extent, and can solve the problem that sand-carrying fluid used in the current fracturing and sand prevention construction process causes large-range pollution to a super-sensitive oil and gas reservoir stratum.

Description

technical field [0001] The invention relates to the field of oil field exploitation, in particular to an enhanced anti-swelling and high-efficiency sand-carrying fluid used for sand control and production increase measures in sensitive oil and gas reservoirs. Background technique [0002] Sand control is an important technical means to ensure the effective development of sand-producing oil and gas wells. In sensitive heavy oil reservoirs, the sand-carrying agent into the well can easily cause the clay minerals in the formation to expand and reduce the permeability. The high pressure is transmitted to the formation, and then carries the proppant into the fracture and supports the fracture after the fracture is closed, finally forming a high conductivity oil and gas seepage channel in the propped fracture. [0003] Most of the currently used sand-carrying fluids are water-based polymer sand-carrying fluids. For example, the Chinese invention patent CN104088616B discloses a coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/575C09K8/60C09K8/68
CPCC09K8/575C09K8/68C09K8/602C09K2208/30C09K2208/12C09K2208/26
Inventor 王伟琳朱建军穆晓东徐岩光卢小娟张晓刘亚洁秦磊磊郑凯周慧洁
Owner CHINA PETROLEUM & CHEM CORP
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