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Novel biological inhibitor for inhibiting activity of sulfate reducing bacteria in oil well and use method thereof

A technology of biological inhibitors and bacterial activity, which is applied in the direction of earthwork drilling and production, wellbore/well parts, etc., can solve the problems of pipe wall corrosion, accelerate oil wells, etc., and achieve the effect of improving removal rate and saving production cost

Active Publication Date: 2013-05-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, some work has been carried out on the SRB biological control technology for surface systems and water injection systems, mainly using nitrate as the activator to activate denitrifying bacteria in the environmental medium, but for oil wells in high temperature environments, the presence of a certain amount of nitrate will accelerate Oil well pipe wall corrosion

Method used

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  • Novel biological inhibitor for inhibiting activity of sulfate reducing bacteria in oil well and use method thereof
  • Novel biological inhibitor for inhibiting activity of sulfate reducing bacteria in oil well and use method thereof
  • Novel biological inhibitor for inhibiting activity of sulfate reducing bacteria in oil well and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Example 1 (indoor corrosion evaluation test)

[0014] In this test, the new inhibitor used is composed of 100 parts of sodium nitrite, 5-10 parts of sodium nitrate, 0.1-0.5 parts of sodium molybdate, and 0.1-0.5 parts of copper nitrate according to the ratio of parts by mass; The agent consists of 100 parts of sodium nitrate, 5-10 parts of sodium nitrite, 0.1-0.5 parts of sodium molybdate, and 0.1-0.5 parts of copper nitrate; and 100 mg / L of fungicide LC is added to each liter of oilfield produced water -3. Bactericide KD-24, traditional inhibitors and new inhibitors were placed in 250mL anaerobic bottles at 65°C for 14 days, and the measured static corrosion rates were shown in Table 1; among them, bactericide LC-3 and bactericide KD -24 is a fungicide commonly used in oil wells in Jiangsu Oilfield; H88-39, H88-21, H88-7 and H88-31 are water samples produced by 4 oil wells in Block Huang 88 of the No. 2 Trial Production Plant of Jiangsu Oilfield. Comparing the experim...

Embodiment 2

[0017] Example 2 (indoor suppression of SRB effect)

[0018] In this embodiment, the novel inhibitor used consists of 100 parts by mass of sodium nitrite, 5-10 parts of sodium nitrate, 0.1-0.5 parts of sodium molybdate, and 0.1-0.5 parts of copper nitrate. Add 100mg / L of the new inhibitor to each liter of oil well produced water, and culture it statically at 65°C, measure the amount of SRB and sulfide content in oil well produced water in different time periods, as shown figure 1 shown. The oil well produced water comes from Well Huang 88-39 in Block Huang 88 of the Second Factory of Jiangsu Oilfield. Depend on figure 1 It can be seen that the new inhibitor can effectively inhibit the activity of SRB, and the removal rate of sulfide can reach more than 98%. The sodium molybdate and copper nitrate in the inhibitor can promote the rapid growth of endogenous denitrifying bacteria to a certain extent. It shows that the inhibitor has good performance of inhibiting SRB and elimin...

Embodiment 3

[0019] Embodiment 3 (on-site application)

[0020] In this embodiment, the novel inhibitor used is composed of 100 parts by mass of sodium nitrite, 6-8 parts of sodium nitrate, 0.3-0.5 part of sodium molybdate, and 0.3-0.5 part of copper nitrate. Select the target well Huang 88-39 to carry out the field test. according to figure 2 Select the dosing method for the target well: continuous dripping through the casing. The casing continuous dripping method needs to be equipped with a 300L gravity automatic dripping dosing tank. According to the fluid production and water content of the oil well, the dosing cycle is 7 days, and the ratio of sodium nitrite to the total mass of sulfide in the produced water is 3:1. Calculate the dosage of sodium nitrite (the sulfide content of Well Huang 88-39 is 86.4mg / L), and add the inhibitor mother liquor. It can be seen from Table 2 that by continuously adding inhibitors, the growth of endogenous denitrifying bacteria in the oil well is stim...

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Abstract

The invention discloses a novel biological inhibitor for inhibiting activity of sulfate reducing bacteria in an oil well and a use method thereof in the field of production of an oil field. The inhibitor comprises the following components in parts by weight: 100 parts of sodium nitrite, 5-10 parts of sodium nitrate, 0.1-0.5 parts of sodium molybdate and 0.1-0.5 parts of cupric nitrate. The use method comprises the following steps of: (1) determining the concentration contents of SO4<2-> and S<2-> in produced water of the oil field; (2) converting dosage of the inhibitor; (3) preparing an inhibitor mother liquid described in claim 1 according to the dosage of sodium nitrite; and (4) adding the inhibitor mother liquid obtained in the step (3) into the shaft through a sleeve in an adding mode by the sleeve of the oil field. The corrosion rate of the produced water is lowered by using the inhibitor, and the production cost is reduced. Growth of source denitrifying bacteria in the well is activated, so that fast grow of SRB (Sulfate Reducing Bacteria) is effectively inhibited. The inhibitor can be used for inhibiting the activity of sulfate reducing bacteria in the oil well.

Description

technical field [0001] The invention relates to an oilfield safe production injection system, in particular to a biological inhibitor. Background technique [0002] Sulfate-reducing bacteria (SRB) and sulfides widely present in oilfield injection systems have caused serious damage and losses, causing a series of problems such as corrosion, perforation, leakage, scaling, blockage, pump inspection, spontaneous combustion and explosion of storage tanks, etc. , Seriously affecting the normal production and operation of the oil field. The method of controlling SRB and sulfide in the oil field mainly adopts chemical and physical methods, which have the disadvantages of high cost, easy to produce drug-resistant bacteria, easy to produce secondary pollution, and treat the symptoms but not the root cause. [0003] In recent years, research on the use of microorganisms to inhibit or eliminate SRB corrosion has received widespread attention. This technology is a new oilfield SRB corro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54E21B41/02
Inventor 吴伟林王彪孟章进杨海滨杨帆雷世华
Owner CHINA PETROLEUM & CHEM CORP
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