Methods of neutralization of hydrogen sulfide in the well

 

(57) Abstract:

The invention relates to the oil industry and can be used in the extraction of crude oil containing hydrogen sulphide. The method includes the preparation of the composition of the catalyst of hydrogen sulfide and feed it into the well. When working wells Bush song mixed with products from one of the active wells Bush and served in the annulus of the remaining wells of the Bush in a quantity sufficient to neutralize the existing production wells quantities of hydrogen sulfide. The song served with the possibility of a chemical reaction between the catalyst and the hydrogen sulfide contained in the production wells Bush. The invention allows to reduce costs for the neutralization of hydrogen sulfide and increase process reliability. 1 Il.

The invention relates to the field of the oil industry and can be used in the extraction of oils containing hydrogen sulfide.

Production of crude oil containing hydrogen sulphide, is associated with problems of protection of the equipment against corrosion, protect the health of personnel and the environment.

Known methods of neutralization of hydrogen sulfide in the preparation of PTA fields with the use of ammonia. Sat. proceedings of Bashneft. , vol. 72, Ufa. 1985, 128 S.). In the crude oil gathering system served water solution of ammonia in composition with the scale inhibitor of the HMB-1 and the tests confirmed the possibility of purification oil in the dehydration process from hydrogen sulfide. But the production from the wells consists of oil, water and gas. The hydrogen sulfide contained in each of the components of production wells: oil, water and gas. Supply of neutralizer of hydrogen sulfide in the system, where components of this product are well separated, it is not possible to effectively neutralize the hydrogen sulfide contained in each component.

A device for dosing of the reagent in the oil well (patent RF N 2127799, MKI E 21 B 37/06, publ. 20.03.98), according to which the reagent, including neutralizer sulfide, supplied directly to the borehole bottom, where all the components of the production wells are in the uniformly mixed state, respectively introduce the reagent directly brought to any component of the production wells. A disadvantage of this device is that this device is required for each well, in addition, the dispenser is in the well, which complicates the installation and operation of the equipment.

Most BL/14, C 09 K 7/00, publ. 23.02.89), which is that in borehole down a second production string and the catalyst is injected into the annular space between the casing and technological columns. The Shoe additional technological columns of the mixing phase of the drilling fluid with the catalyst of hydrogen sulfide and increases the efficiency of neutralization of hydrogen sulfide. However, this method is not efficient enough to neutralize the hydrogen sulfide in the production of oil wells, consisting of three components: oil, gas and water.

The objective of the proposed technical solution is the reduction of costs for neutralization of hydrogen sulfide, the improvement of process reliability in comparison with the known patent.

This objective is achieved in that in the method of neutralization of hydrogen sulfide in the well, including the preparation of the composition of the catalyst of hydrogen sulfide and feed it into the well, according to the invention the composition is mixed with products from one of the active wells Bush and served in the annulus of the remaining wells of the Bush.

Additional mixing of the composition of the catalyst of hydrogen sulfide - water plants is good contact of the composition with the well production and a more complete neutralization of hydrogen sulfide.

The feed mixture composition of the catalyst of hydrogen sulfide in the well annulus to neutralize the hydrogen sulfide simultaneously in all components of the production wells prior to their separation into oil, water and gas.

The proposed method can be implemented with the system shown in the drawing.

The installation includes the following units and equipment: wells 1, United in the hive, the process unit 2 group measuring unit, the device 3 for the dosage of the composition of the catalyst of hydrogen sulfide, the mixing device 4, a flow line of wells 5, a collecting reservoir 6, flow line 7, line 6, the collector 9 for injection products in the annular space of wells, the check valve 10, the valve 11 to 16 pipelines. The drawing shows only three wells and one well cluster can be more than ten. All wells Bush are connected in a similar manner as shown in the drawing.

The method is implemented as follows.

Production wells 1 through flow lines 5 wells enters the process unit 2 group measuring unit, further production wells in precast collector 6 is directed to the point of oil, water and gas.

When applying neutralizer of hydrogen sulfide in the mixture with the products of a single hole in the annulus of the other wells is rinsed with sulfurous gas in the upper part of the annulus, then the mixture passes the layer of oil cha is mixed with the products in the annulus of the well and will neutralize the hydrogen sulfide, in gas, oil and water. Thus, the annulus of the well serves as a device, where the most efficient way there is a chemical reaction between the catalyst and the hydrogen sulfide in the production wells. If in the annulus chemical reaction is not completed, it continues when lifting products for pump-compressor pipe and then into a collecting reservoir. This pump provides additional mixing of the neutralizer sulphide production wells, the acceleration and completion of the chemical reaction.

Technological tying wells, the presence of valves 11-16 and check valves 10 allow for neutralization of hydrogen sulfide in the production wells as at an operating condition, and at the stop of the individual wells.

The mixer 4 can be used in any type of mixer - hydrodynamic, mechanical, etc. is the best mixture alternating magnetic field of low frequency. In addition to the effect of mixing appear additional very beneficial effects on the magnetization of the fluid, for example, is greatly reduced corrosivity of produced water extracted from the reservoir allows to accelerate the supplied contact of catalyst with hydrogen sulfide, contained in the production wells and accordingly provide a more complete neutralization of hydrogen sulfide.

The proposed scheme allows the supply of neutralizer at one point to cover all wells of one of the Bush and to neutralize the hydrogen sulfide with minimal cost.

The use of wells as a system, which is the neutralization of hydrogen sulfide, greatly simplifies and reduces the cost of the process compared to using for this purpose ground vehicles. This contributes to the fact that the bottom hole is at the point of sampling production pump deep main part of the gas dissolved in the liquid, and the water and oil emulsion, i.e., the process of neutralization of hydrogen sulfide in all three components of the production wells is at the same time.

Neutralization of hydrogen sulfide in the well eliminates contamination (poisoning) of the air in the oil, starting from the wellhead, which cannot be avoided by the neutralization of hydrogen sulfide in ground vehicles.

However, due to the neutralization of hydrogen sulfide, from the well bottom is reached corrosion protection of all equipment systems, oil production, including underground equipment swainsoni costs and improve reliability of the process of neutralization of hydrogen sulfide, contained in the production wells: oil, gas, and water.

Methods of neutralization of hydrogen sulfide in the well, including the preparation of the composition of the catalyst of hydrogen sulfide and feed it into the well, wherein when operating wells Bush song mixed with products from one of the active wells Bush and served in the annulus of the remaining wells of the Bush in a quantity sufficient to neutralize the existing production wells quantities of hydrogen sulfide with the possibility of a chemical reaction between the catalyst and the hydrogen sulfide contained in the production wells of the Bush, to provide protection against corrosion of all equipment systems, oil production, including underground equipment wells, starting with their slaughter.

 

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