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Acid-salt solid-phase-free medium-density workover fluid and preparation method thereof

A preparation method, solid phase-free technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of scaling damage, high pressure of Banqiao water injection well, difficult operation, etc. Good shale expansion and the effect of meeting environmental protection requirements

Active Publication Date: 2015-12-23
BC P INC CHINA NAT PETROLEUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Applied to high temperature and severe water sensitive formations, there are disadvantages such as poor environmental protection performance and poor system stability
[0006] At present, there are many problems in the workover process: such as the formation damage caused by the common use of brine to suppress wells, and the difficulty in operation of Banqiao water injection wells due to high pressure, etc., high temperature and high pressure in the deep layers of the divergence wells require high-density workover fluids to protect oil layers to solve on-site problems. homework problem
At present, 1.4g / cm is generally used for medium and high pressure wells 3 Liquid calcium medium-density workover hydraulic wells are not only prone to crystallization and instability, but also incompatibility with formation water, causing scale damage to the formation and resulting in production reduction

Method used

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  • Acid-salt solid-phase-free medium-density workover fluid and preparation method thereof
  • Acid-salt solid-phase-free medium-density workover fluid and preparation method thereof
  • Acid-salt solid-phase-free medium-density workover fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a beaker with a volume of 500 ml, measure 40.2 parts of clear water with a graduated cylinder as the base liquid, first add 0.175 parts of sodium dodecylbenzenesulfonate, and stir at a high speed for 5 minutes, for example, at a rate of 3000 rpm; Slowly and evenly add 0.4 parts of corrosion inhibitor, and stir for 5 minutes at high speed, for example, at a rate of 3000 rpm; finally add 58 parts of sodium dihydrogen phosphate, and mix well to prepare the finished product.

[0023] The main component of the low-cost acid salt-free medium-density workover fluid of the present invention is sodium dihydrogen phosphate, which has good solubility and a density of up to 1.40g / cm 3 See Table 1; it has good stability, and its temperature resistance can reach 160°C, see Table 2; it does not contain solid phase components, does not contain divalent ions such as calcium and magnesium, and has strong characteristics of inhibiting shale expansion. The reduction rate is greater than...

Embodiment 2

[0034] In a beaker with a volume of 500 ml, measure 42 parts of clear water with a graduated cylinder as the base liquid, first add 0.05 part of sodium dodecylbenzenesulfonate, stir at high speed for 5 minutes, for example, stir at a rate of 3000 rpm; Slowly and evenly add 0.5 parts of corrosion inhibitor, stir at high speed for 5 minutes, for example, at a rate of 3000 rpm; finally add 60.2 parts of sodium dihydrogen phosphate, and mix well to prepare the finished product.

[0035] The density of the low-cost acid salt-free medium-density workover fluid of the present invention can reach 1.39g / cm 3 , with formate-free solid-phase workover fluid good reservoir protection performance, compared with the same density formate system, the cost is reduced by more than 20%.

[0036] Table 5 Cost comparison of low-cost acid salt of the present invention without solid phase medium density workover fluid

[0037]

Embodiment 3

[0039] In a beaker with a volume of 500 ml, measure 39 parts of clear water with a graduated cylinder as the base liquid, first add 0.3 part of sodium dodecylbenzenesulfonate, stir at high speed for 5 minutes, for example, stir at a speed of 3000 rpm; Then slowly and evenly add 0.3 parts of corrosion inhibitor, stir at high speed for 5 minutes, for example, stir at a rate of 3000 rpm; finally add 56 parts of sodium dihydrogen phosphate, and mix well to prepare the finished product with a density of 1.41g / cm 3 , which will not be repeated here.

[0040] Compared with liquid calcium, brine, mud, and formate salt solid-free high-density workover fluids in the prior art, the low-cost acid salt solid-free medium-density workover fluid technology provided by the embodiment of the present invention has the following advantages :

[0041] 1. The performance of the low-cost acid salt-free medium-density workover fluid in the present invention is stable, and the density can reach 1.40g...

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Abstract

The invention discloses an acid-salt solid-phase-free medium-density workover fluid and a preparation method thereof. The acid-salt solid-phase-free medium-density workover fluid comprises the following components in parts by weight: 39-42 parts of clear water, 56-60.2 parts of sodium dihydrogen phosphate, 0.05-0.3 part of sodium dodecyl benzene sulfonate and 0.3-0.5 part of corrosion inhibitor. The low-cost acid-salt solid-phase-free medium-density workover fluid has stable performance, the density can reach 1.40 g / cm<3>, and the temperature resistance can reach 160 DEG C. The low-cost acid-salt solid-phase-free medium-density workover fluid (with the density of 1.4 g / cm<3>) is free of any solid-phase component, and thus, has the advantage of no solid phase; and compared with the formate solid-phase-free workover fluid system with the same density, the cost is lowered by 20% or above.

Description

technical field [0001] The invention relates to the technical field of petroleum acquisition, in particular to an acid salt-free medium-density workover fluid and a preparation method thereof. Background technique [0002] Medium-density workover fluids are mainly used in medium-high pressure oil and gas well workover operations to balance formation pressure and protect oil and gas layers. At present, the medium and high density workover fluids used at home and abroad are mainly divided into three systems, the high density mud system, the density can reach 2.6g / cm 3 Above; no solid phase brine system, the density can reach up to 2.30g / cm 3 ; High-density water-in-oil workover fluid, density 1.40-2.0g / cm 3 . [0003] The high-density mud system mainly relies on the suspension capacity of clay, adding calcium carbonate powder, iron ore powder, barite powder, etc. to increase the density, and maintaining its rheological properties by adding other treatment agents. It has th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52C09K8/506
CPCC09K8/506C09K8/52C09K2208/32
Inventor 董军周宝义王晓东张栋李新建谢朝钢赵涛柴希军
Owner BC P INC CHINA NAT PETROLEUM CORP
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