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A kind of oil well water blocking agent and preparation method thereof

A water plugging agent and oil well technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problem that the compressive strength of the plugging agent and the setting time cannot meet the requirements at the same time, and achieve good delay and prolongation of the reaction time. Effective period of water blocking and strong controllability

Active Publication Date: 2022-04-08
DAQING PETROLEUM ADMINISTRATION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a water plugging agent for oil wells and its preparation method, which solves the problem that the compressive strength and setting time of existing plugging agents cannot meet the requirements at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Water blocking agent formula: it is composed of the following components according to the mass percentage

[0035] Cement (particle size 15μm) 3%, sodium aluminosilicate 18%, initiator sodium metaaluminate 1.2%, regulator sodium lignosulfonate 1.5%, enhancer amino-modified silica 10%, clear water 66.3%.

[0036] (2) Preparation process: add enhancer amino-modified silica to clean water, stir and dissolve for 15 minutes, then continue to add initiator sodium metaaluminate and regulator sodium lignosulfonate, stir and dissolve for 20 minutes, and finally add cement and silicon After the sodium aluminate, continue to stir for 30 minutes, and wait until it is dissolved and dispersed evenly to obtain the oil well water shutoff agent of this embodiment.

Embodiment 2

[0038] (1) Water blocking agent formula: it is composed of the following components according to the mass percentage

[0039] Cement (particle size 5μm) 5%, sodium aluminosilicate 15%, initiator sodium metaaluminate 2%, regulator sodium lignosulfonate 3%, enhancer amino-modified silica 7%, clear water 68%.

[0040] (2) The preparation process is the same as that in Example 1.

Embodiment 3

[0042] (1) Water blocking agent formula: it is composed of the following components according to the mass percentage

[0043] Cement (particle size 10μm) 3.5%, sodium aluminosilicate 20%, initiator sodium metaaluminate 1.0%, regulator sodium lignosulfonate 2%, enhancer amino-modified silica 5%, clear water 68.5%.

[0044] (2) The preparation process is the same as that in Example 1.

[0045] Verification example

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Abstract

The invention discloses an oil well water shutoff agent and a preparation method thereof. The oil well water shutoff agent includes cement, aluminosilicate, initiator, regulator, reinforcing agent and water; the metaaluminate is metaaluminum sodium lignosulfonate, the lignosulfonate is sodium lignosulfonate, the modified silica is amino-modified silica, and the particle diameter of the cement is not more than 20 μm; The problem that the coagulation time cannot meet the requirements at the same time.

Description

technical field [0001] The invention relates to a water shutoff agent used in the field of oilfield chemistry, in particular to a water shutoff agent for oil production wells. Background technique [0002] Plugging control technology has always been an important technology for improving oil recovery in various oilfields. Currently, commonly used polyacrylamide gel plugging agents and ultra-fine cement plugging agents have their own adaptability weaknesses, resulting in low success rates of water plugging in oil wells and increased production. Small amplitude and short validity period. [0003] Among them, the polyacrylamide jelly-type plugging agent can preferentially enter the formation with high water saturation, adsorb on the rock surface, and the unadsorbed part extends in the water to reduce the permeability of the formation to water. Its setting time is 2h to 72h, but The compressive strength does not exceed 0.8Mpa, which is relatively weak. [0004] Ultra-fine cemen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C09K8/506
CPCC04B28/00C09K8/506C04B14/04C04B22/08C04B24/18C04B22/06
Inventor 徐方俊李晓东殷柱王康红李延庆张光禹
Owner DAQING PETROLEUM ADMINISTRATION
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