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Negative pressure well fluid for oil well repairing operation and its prepn

A technology of killing fluid and negative pressure well, applied in drilling equipment and other directions, can solve problems such as formation damage, environmental and formation pollution, clay swelling, etc., and achieve the effects of preventing low water loss, overcoming leakage, and being easy to prepare.

Inactive Publication Date: 2004-09-08
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above known technologies provide a good method for preparing high specific gravity well killing fluid, but the hydrolysis of methylene polyacrylamide and polyacrylamide with carboxyl groups will easily cause clay swelling, which will cause certain damage to the formation, and chromium as cross-linked The joint agent also has certain pollution to the environment and formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Negative pressure well well killing fluid and preparation method thereof for oilfield workover operations

[0027] Group ratio

[0028] PF-C cationic polyelectrolyte 30

[0029] (produced by Shandong Rising Biochemical Co., Ltd.)

[0030] Coconut Diethanolamide 62

[0031] Sodium dodecylbenzene sulfate 2.5

[0032] Polyquaternium 5.5

[0033] The above-mentioned PF-C cationic polyelectrolyte is a light yellow viscous cationic polyelectrolyte with a 10% content of cationization degree of 3 and a molecular weight of 2.8 million produced by Shandong Rising Biochemical Co., Ltd. which is commercially available.

[0034] The above-mentioned coconut oil diethanolamide is prepared as follows: in parts by weight, add 43 parts of coconut oil and 60 parts of diethanolamine into the kettle, heat up to 100°C under stirring, add 0.5 parts of KOH, and continue to heat up to 130°C ℃, under nitrogen protection, react for 2 hours, the prod...

Embodiment 2

[0037] Embodiment 2: As described in Embodiment 1, the difference is that the kill fluid composition is as follows, by weight:

[0038] Group ratio

[0039] PF-C cationic polyelectrolyte 40

[0040] (produced by Shandong Rising Biochemical Co., Ltd.)

[0041] Coconut Diethanolamide 55

[0042] Sodium cetylbenzene sulfate 1.8

[0043] Polyquaternium 3.2

Embodiment 3

[0044] Embodiment 3: As described in Embodiment 1, the difference is that the kill fluid composition is as follows, by weight:

[0045] Group ratio

[0046] PF-C cationic polyelectrolyte 50

[0047](produced by Shandong Rising Biochemical Co., Ltd.)

[0048] Coconut Diethanolamide 48

[0049] Sodium cetylbenzene sulfate 2

[0050] Polyquaternium 0

[0051] Indicator name

indicators

Viscosity(20℃)mPaS

Solid content%

PH value

Exterior

Density g / cm 3

120-135

2.70+0.10

10-11

light yellow translucent

0.95-1.05

[0052] project

indicators

1

2

Density g / cm 3

1.190

1.42

Water loss at room temperature (%)ml / 30min

5.8

5.9

High temperature water loss (%)ml / 30min

(curing at 80°C for more than 100h)

18.0

18.5

[0053] Reagent

Before pollution

Rea...

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Abstract

The present invention is negative pressure well control fluid for oil well repairing operation with less damage and belongs to the field of oil field chemical technology. The well control fluid consists of cationic polyelectrolyte 30-50 weight portions, cocoanut oil diethanolamide 40-62 weight portions, sodium alkylbenzenesulfate 1.5-2.5 weight portions and polyquaternary ammonium 0-5.5 weight portions, which are added successively and mixed to obtain the well control fluid product. The well control fluid of the present invention has certain viscosity, produces stable foam during pumping, becomes dilute under shearing condition, and is easy to prepare, high in heat resistance and low in cost.

Description

(1) Technical field [0001] The invention relates to a low-damage negative pressure well killing fluid for well workover operations in oilfields, and belongs to the technical field of oilfield chemicals. (2) Background technology [0002] In oil production and workover operations, the choice of killing fluid is one of the most important keys to improve pump efficiency, increase crude oil production, and improve operation success rate. If the killing fluid is not selected properly, the formation will often be blocked, resulting in no obvious increase in crude oil production after well completion and workover, and even serious damage to the formation. At present, the commonly used kill fluid mainly prepared with hydroxymethyl cellulose and methylene polyacrylamide has the disadvantages of difficulty in preparation, high water loss, can cause formation swelling, and cause great damage to the formation. Chinese patent application 85108040 discloses a "method for preparing solid ...

Claims

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Application Information

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Inventor 辛寅昌徐俊侯尔群安骏
Owner SHANDONG NORMAL UNIV
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