Process for performing well completion by utilizing biological completion fluid

A completion fluid and process technology, applied in wellbore/well parts, cleaning tools, production fluids, etc., can solve the problem that the reservoir cannot be further improved, it is difficult to remove pore solid phase plugging, and oil flow is difficult to remove deep damage, etc. problem, to achieve the effect of good protection, easy operation and good rock wettability

Inactive Publication Date: 2011-01-12
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these completion fluid systems can achieve low damage to the reservoir through a lot of work, and the technical parameters meet the requirements of reservoir protection, but it cannot relieve and overcome the original damage of the reservoir: such as various macromolecular treatment agents in the Adsorption, retention and accumulation in the reservoir; incompatibility between various operating fluids and formation water; incompatibility between various operating fluids and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment includes the following steps:

[0031] Step 1: Prepare biological enzyme and water according to the mass ratio to prepare a 10% biological enzyme aqueous solution. The biological enzyme is composed of 10 parts of protease, 15 parts of hemicellulase, 30 parts of NOWEE compound enzyme, and 10 parts of trehalolipid Mixed with 35 parts of BOVEE bioactive substances;

[0032] Step 2: prepare a 7.5% biological acid aqueous solution according to the mass ratio of biological acid and water, and the biological acid is an acid extracted by a biological process, such as fruit acid produced by fermentation;

[0033] Step 3: After perforation, use the lower tubing with a high-pressure water jet device to squeeze the biological enzyme aqueous solution and the biological acid aqueous solution into the well sequentially or after mixing. The total volume of the two liquids is calculated according to the following formula:

[0034] In the formula: V——total dosage, m 3 ;...

Embodiment 2

[0042] This embodiment includes the following steps:

[0043] Step 1: Prepare biological enzyme and water according to the mass ratio to prepare a 5% biological enzyme aqueous solution. The biological enzyme is composed of 20 parts of protease, 25 parts of hemicellulase, 20 parts of NOWEE compound enzyme, and 5 parts of trehalolipid Mixed with 30 parts of BOVEE bioactive substances;

[0044] Step 2: prepare a 10% biological acid aqueous solution according to the mass ratio of biological acid and water, and the biological acid is an acid extracted by a biological process, such as fruit acid produced by fermentation;

[0045] Step 3: After perforation, use the lower tubing with a high-pressure water jet device to squeeze the biological enzyme aqueous solution and the biological acid aqueous solution into the well sequentially or after mixing. The total volume of the two liquids is calculated according to the following formula:

[0046] In the formula: V——total dosage, m 3 ;

...

Embodiment 3

[0054] This embodiment includes the following steps:

[0055] Step 1: Prepare biological enzyme and water according to the mass ratio to prepare a 2% biological enzyme aqueous solution. The biological enzyme is composed of 30 parts of protease, 35 parts of hemicellulase, 10 parts of NOWEE compound enzyme, and 10 parts of trehalolipid Mixed with 15 parts of BOVEE bioactive substances;

[0056] Step 2: prepare a 15% biological acid aqueous solution according to the mass ratio of biological acid and water, and the biological acid is an acid extracted by a biological process, such as fruit acid produced by fermentation;

[0057] Step 3: After perforation, use the lower tubing with a high-pressure water jet device to squeeze the biological enzyme aqueous solution and the biological acid aqueous solution into the well sequentially or after mixing. The total volume of the two liquids is calculated according to the following formula:

[0058] In the formula: V——total dosage, m 3 ;

...

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Abstract

The invention discloses a process for performing well completion by utilizing biological completion fluid, which comprises the following steps of: preparing biological enzyme aqueous solution; preparing biological acid aqueous solution; sequentially squeezing or mixing and squeezing the biological enzyme aqueous solution and the biological acid aqueous solution into a well by using a tubing high-pressure water jet device after perforation; and finally closing the well for 24 to 72 hours, washing boreholes after pressure diffusion, and performing a cyclic filling and sand prevention process. As de-plugging and scale formation prevention are combined and physical measures and chemical measures are combined, the process has the advantage of fulfilling the aims of effectively improving the permeability around the well, the production efficiency of an oil well, the yield and the recovery ratio at the premise of protecting oil pools.

Description

technical field [0001] The invention relates to a well completion process in oilfield development, in particular to a well completion process using biological well completion fluid. Background technique [0002] According to the connection between the production layer and the wellbore and the structure of the bottom hole, the completion methods can be divided into: open hole completion, perforation completion, liner completion, gravel packing completion, etc. Damage and the constraints of the formation itself have caused many production wells to fail to achieve the expected results. In addition to drilling factors, many times it is because the completion of wells is not done in a suitable way, resulting in low production efficiency and very uneconomical, and some wells even become dead wells due to pollution. [0003] The current water-based completion fluids are mainly solid-free clean brine completion fluids and solid-free polymer glues. The main components are water-solu...

Claims

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Application Information

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IPC IPC(8): E21B37/06E21B43/22
Inventor 屈展盖海防
Owner XI'AN PETROLEUM UNIVERSITY
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