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Method for treatment of hydrogen sulfide in oil well

A technology for hydrogen sulfide and oil wells, which is applied in chemical instruments and methods, earthwork drilling, wellbore flushing, etc. It can solve problems such as high sulfate ion content, abnormal production of oil wells, and safety issues, so as to improve water injection effect and control Effective, simple method

Active Publication Date: 2017-07-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the development of water flooding reservoirs, part of the injected clear water has a high content of sulfate ions. When the formation temperature is 50-60°C, the temperature and pressure are suitable for the growth of sulfate-reducing bacteria. Under pressure conditions, rapid growth and reproduction, under the growth and metabolism of sulfate-reducing bacteria, ferrous sulfide scale is formed and hydrogen sulfide gas is produced. When the hydrogen sulfide content exceeds a certain value, there will be safety hazards, which will cause the oil well to fail to produce normally

Method used

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  • Method for treatment of hydrogen sulfide in oil well
  • Method for treatment of hydrogen sulfide in oil well
  • Method for treatment of hydrogen sulfide in oil well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 Control the method that hydrogen sulfide content exceeds the standard in the oil well

[0024] First determine the cause of hydrogen sulfide generation, and then formulate hydrogen sulfide treatment methods, as follows:

[0025] 1. Laboratory analysis of block core, oil-water mineral composition and injected water

[0026] Through the analysis of the sulfur content of the sulfur-containing minerals in the core of the block, the analysis of the sulfur content of the oil and water produced in the formation, and the analysis of the sulfate ion in the injected water, the cause of the hydrogen sulfide generation is determined.

[0027] (1) Sulfur content analysis of block core sulfur-bearing minerals

[0028] In order to know whether the stratum of the block contains the parent rock material that forms hydrogen sulfide gas, the core of the block was taken for X-ray diffraction whole-rock analysis (Table 2), and the mineral identification was carried out. The re...

example 1

[0071] Example 1 Hydrogen sulfide treatment and effect in Well WBC74-X13 of Dongsheng Company

[0072] (1) Construction background

[0073] Well WBC74-X13 has a single well controlled reserve of 150,000 tons. It was put into production in February 2009, with an initial daily liquid of 1.0 tons and a water cut of 20%. Well Shouchang 74-Gengeng 14 water injection has achieved obvious effects (since October 2010), the whole well accumulated 2670 tons of oil and 3212 cubic meters of water. On September 10, 2012, the hydrogen sulfide exceeded the standard to 1300PPm, and the well was sealed and closed on November 10, 2012. Before closing the well, the daily liquid was 9.0 tons, the daily oil was 4.2 tons, and the water cut was 53%.

[0074] (2) Construction purpose

[0075] Utilize formation hydrogen sulfide treatment technology to treat excess hydrogen sulfide, restore production, and ultimately increase oil recovery.

[0076] (3) Construction effect

[0077] The well was tre...

Embodiment 2

[0078] Embodiment 2 A kind of method of controlling hydrogen sulfide in oil well

[0079] Proceed as follows:

[0080] (1) Lower hydrogen sulfide treatment process pipe string: the lower pen tip at the bottom of the pipe string, and the upper part is connected to N80 flat oil pipe, so that the pen tip is located in the middle of the oil layer to be treated;

[0081] (2) Wash the well with sodium hydroxide solution first, and then wash the well with water; the amount of liquid used is 2 times the volume of the wellbore; the pH value of the liquid returned from the well washing at the end of the well washing is 7.0; the concentration of the sodium hydroxide solution is hydrogen sulfide 2.5 times the gas concentration, and not less than 25kg / 10m 3 ;

[0082] (3) Extrude with water, calculate the water absorption index at 18MPa, and test the normal injection amount of the agent during construction;

[0083] (4) Squeeze injection of sulfate-reducing bacteria inhibitor solution, ...

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Abstract

The invention discloses a method for treatment of hydrogen sulfide in an oil well. The method comprises the following steps that (1) a hydrogen sulfide treatment technological pipe column is placed down; (2) a sodium hydroxide solution is used for well washing firstly, and then water is used for well washing; (3) a water reagent is used, and the water absorbing index is figured out under the pressure intensity of 18 MPa; (4) a sulfate reducing bacterium inhibitor solution is injected in a squeezed mode, water is injected for substituting, and the treatment radius of the oil well is 2-4 m; (5) a tetrakis hydroxymethyl phosphonium sulfate (THPS) bactericide solution is injected in a squeezed mode, and water is injected for substituting; and (6) the well is closed to conduct reaction for 10 days, and the well is opened to conduct normal production. According to the method for treatment of the hydrogen sulfide in the oil well, hydrogen sulfide gas and ferrous sulfide scale can be effectively eliminated, growth of sulfate reducing bacteria in a stratum can be effectively inhibited, and thus the oil can recover normal production; and the blank that due to water injection, the hydrogen sulfide content of the stratum exceeds the standard, and treatment is conducted is filled up, and the method has the advantages of being simple, high in operability, effective, practical and the like.

Description

technical field [0001] The invention relates to a method for treating hydrogen sulfide in oil wells, which can reduce the content of hydrogen sulfide in oil wells and improve the effect of water injection, and can be used for treating excessive hydrogen sulfide content in oil wells, belonging to the technical field of oilfield development. Background technique [0002] During the development of water flooding reservoirs, part of the injected clear water contains high sulfate ion content. When the formation temperature is 50-60°C, the temperature and pressure are suitable for the growth of sulfate-reducing bacteria. After the bacteria enter the formation with the injected water, Under pressure conditions, rapid growth and reproduction, under the growth and metabolism of sulfate-reducing bacteria, ferrous sulfide scale is formed and hydrogen sulfide gas is produced. When the hydrogen sulfide content exceeds a certain value, there is a safety hazard, which will cause the oil wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B41/02E21B21/00E21B47/00E21B49/00C09K8/54
CPCC09K8/54C09K2208/20C09K2208/32E21B21/00E21B41/02E21B47/00E21B49/00
Inventor 朱建军宗可玲陈晓雯李祥同任延霞陈存利秦磊磊张鑫王艺森栾雅珺牛琳李震王翠郑凯齐鲁明
Owner CHINA PETROLEUM & CHEM CORP
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