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Application of sodium silicate aqueous solution in the middle and late stages of oilfield production

A sodium silicate aqueous solution and oilfield technology, which is applied to drilling compositions, wellbore/well parts, earthwork drilling and production, etc., can solve the problems of plugging agent leakage and achieve the effect of solving plugging agent leakage

Active Publication Date: 2016-01-20
XINJIANG KARAMAY CAIFENG IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an aqueous solution of sodium silicate in the late stage of oil field production, which can effectively and thoroughly solve the problem of plugging agent leakage, and ensure that the water injection well can perform normal profile control, water plugging, and plugging operations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example

[0014] On July 21, 2005, at the T2K1 layer in Block 82 of the Second Oil Production Plant, well 258 was treated outside the pipe (plugging operation), and the operation continued until December 12, when the well was put into production. Five operations were carried out, four of which were times invalid.

[0015] 1. The positive extrusion density is 1.8 g / cm 3 12 meters of grout 3 , After shutting down the well and waiting for condensing for 48 hours, the pressure test was 3MPa, but the pressure did not rise, which was unqualified.

[0016] 2. The positive extrusion density is 1.8 g / cm 3 12 meters of grout 3 , After shutting down the well and waiting for condensing for 48 hours, the pressure test was 3MPa, but the pressure did not rise, which was unqualified.

[0017] 3. The positive extrusion density is 1.8 g / cm 3 18 meters of grout 3 , After shutting down the well and waiting for condensing for 48 hours, the pressure test was 3MPa, but the pressure did not rise, which w...

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PUM

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Abstract

The invention discloses the application of sodium silicate aqueous solution in the middle and late stages of oil field production. Before profile control, water plugging and leakage plugging are carried out on oil-water wells, sodium silicate with a volume percentage of 25%-100% is squeezed into the well first. Aqueous solution 1-50 m3, after being squeezed into the spacer liquid 2-5 m3 of clean water, then squeezed into 10-20 m3 of cement slurry with 8≤PH≤9 and density of 1.4-1.8 g / cm3, and then normalized After squeezing 1-50 m3 of clean water into the replacement fluid, the process of profile control, water plugging and leak plugging can be carried out normally without waiting for coagulation, so as to block the cracks and large pores in the formation first, and then proceed to the next step. It can effectively and thoroughly solve the problem of plugging agent leakage, and ensure that water injection wells can perform normal profile control, water plugging, and leak plugging operations.

Description

technical field [0001] The invention relates to a method for profile control, water plugging and leakage plugging of water injection wells mainly used in the middle and late stage of oil field production, that is, the application of sodium silicate aqueous solution in the middle and late stage of oil field production. Background technique [0002] In the middle and late stages of oil field production, we often encounter: 1. The water injection profile of the water injection well is not uniform during the water injection work, and fingering often occurs, which affects the oil displacement effect. Therefore, it is necessary to adjust the water injection profile, that is, profile control. 2. When the oil well is producing crude oil normally, the water content in the crude oil is generally very low at the initial stage, but in the middle and late stages, some oil production wells have a water content of 100%, and the rise of the water content affects the crude oil production, so ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/12C09K8/467
Inventor 尚义刚马剑张治豪向文军宋刚
Owner XINJIANG KARAMAY CAIFENG IND