Solid-phase-free clean low-damage well killing fluid and preparation method thereof

A technology without solid phase and killing fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems such as the large influence of brine density and the large filtration loss of brine killing fluid, and achieve good fluidity , adjustable density, to meet the effect of on-site construction requirements

Inactive Publication Date: 2021-02-19
蒲城驭腾新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the brine kill fluid has a large amount of filtration loss, no suspen

Method used

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  • Solid-phase-free clean low-damage well killing fluid and preparation method thereof
  • Solid-phase-free clean low-damage well killing fluid and preparation method thereof
  • Solid-phase-free clean low-damage well killing fluid and preparation method thereof

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preparation example Construction

[0031] A method for preparing a solid-free clean low-damage well killing fluid, comprising the following steps:

[0032] Add the weighting agent into the water, stir evenly to prepare well killing fluid preparation fluid, add viscosifier, fluid loss reducer, inorganic salt crystallization inhibitor, clay stabilizer in sequence, after stirring evenly, you can get clean low damage pressure without solid phase well fluid.

Embodiment 1

[0049] During the workover process, the filtrate in the killing fluid may enter the oil and gas layers and cause certain damage to the oil layer. In order to evaluate the damage degree of the solid-free clean and low-damage killing fluid to the formation, the core flow experiment was used to select Comparative experiments were conducted on cores with different high and low permeability to investigate the degree of damage caused by the killing fluid to the cores, and the results are shown in the table below.

[0050] Tackifier 20g, fluid loss reducer sulfomethyl phenolic resin SMP6g, inorganic salt crystallization inhibitor 1g, weighting agent 200g (water-soluble organic acid salt sodium formate and CaCl The mass ratio is 1:3), clay stabilizer 10g, water It is 763g. After mixing and stirring at room temperature for 30 minutes, a solid-free, clean and low-damage killing fluid can be obtained. Do the killing fluid to pollute the core, the results are shown in Table 1.

[0051] ...

Embodiment 2

[0055]Configure solid-free clean killing fluid: viscosifier (weak gel formed by chromium acetate and partially hydrolyzed polyacrylamide cross-linking agent) 2.0%, fluid loss reducer (sulfomethyl phenolic resin SMP) 0.6%, Inorganic salt crystallization inhibitor 0.1%, weighting agent (the mass ratio of water-soluble organic acid salt sodium formate to CaCl2 is 1:2) 30%, clay stabilizer 1%, and the balance is water, and the pollution test of well killing fluid on core is done. The results are shown in Table 2.

[0056] Table 2 Experimental data of killing fluid on core contamination

[0057]

[0058]

[0059] From Table 2, it can be found that the low-damage killing fluid with no solid phase cleaning in the ring has a good effect of protecting the oil layer, has good compatibility with the formation, and can meet the requirements of on-site construction with low damage and no pollution. Its popularization and application has extensive economic and social benefits.

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Abstract

The invention discloses a solid-phase-free clean low-damage well killing fluid and a preparation method thereof. The solid-phase-free clean low-damage well killing fluid comprises 1.5%-2.5% of a tackifier, 0.8%-1.2% of a filtrate reducer, 0.05%-0.2% of an inorganic salt crystallization inhibitor, 8%-30% of a weighting agent, 0.5%-2% of a clay stabilizer and the balance of water. The well killing fluid is used for well drilling, well repairing and other well killing operation in downhole operation, and is good in compatibility with strata, low in damage, free of pollution, adjustable in densityand good in mobility.

Description

technical field [0001] The invention belongs to the field of well-killing fluid for downhole operations in oil fields, and in particular relates to a solid-phase-free, clean and low-damage well-killing fluid and a preparation method thereof. Background technique [0002] After the oil and gas well enters the late stage of development, the energy of the formation continues to decay. When the oil and gas well is abnormal or shut down, it is necessary to carry out workover, replace or optimize the production string, and restore the oil and gas well to production. When doing workover operations on production wells, it is usually necessary to fill the wellbore with killing fluid, and use the hydrostatic liquid column pressure generated by the killing fluid to prevent formation fluid from flowing into the wellbore, so as to avoid occurrence of wellbore or blowout, and to help support the tubing Pipe strings prevent the well wall from collapsing and ensure the safety of workover co...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/588C09K8/52
CPCC09K8/52C09K8/58C09K8/588C09K2208/12C09K2208/28C09K2208/34
Inventor 陈力群
Owner 蒲城驭腾新材料科技有限公司
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