CN110331951B - Method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution - Google Patents
Method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution Download PDFInfo
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- CN110331951B CN110331951B CN201910575964.1A CN201910575964A CN110331951B CN 110331951 B CN110331951 B CN 110331951B CN 201910575964 A CN201910575964 A CN 201910575964A CN 110331951 B CN110331951 B CN 110331951B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/067—Separating gases from drilling fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/068—Arrangements for treating drilling fluids outside the borehole using chemical treatment
Abstract
The invention discloses a method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution, which comprises the following steps: a. taking a circulating tank on site, adding clear water, adding 30-50% of basic zinc carbonate and 1.5% of pH regulator by mass percent, and measuring the pH value of the solution to be more than or equal to 11 to obtain water-soluble glue solution; b. and (2) selecting a circulating tank on site, adding base oil which is equivalent to 80% of the volume of the tank body and is used by the site oil-based drilling fluid by mass percent, reserving 20% of space for adding the following treating agent, and ensuring that the space for full stirring is reserved. Adding 3% of emulsifier, 3% of wetting agent and 3% of filtrate reducer into base oil to obtain an oil-based glue solution; c. and injecting the water-soluble glue solution into the oil-based drilling fluid which is used on site, simultaneously supplementing the oil-based glue solution, and ensuring that 4 parts of the oil-based glue solution are supplemented every time 1 part of the water-soluble glue solution is supplemented. The method can effectively remove the hydrogen sulfide dissolved in the oil-based drilling fluid, is convenient for on-site configuration, is easy to operate and has good removal effect.
Description
Technical Field
The invention relates to the technical field of removing hydrogen sulfide in drilling fluid in the petroleum and natural gas drilling industry.
Background
During drilling, hydrogen sulfide (H) is sometimes encountered2S) polluting the drilling fluid. H2S is primarily from sulfur-bearing formations and may also be produced by the decomposition of certain sulfonated organic treatments and lignosulfonates at high downhole temperatures. Hydrogen sulfide is a fatal highly toxic gas, and a small amount of high-concentration hydrogen sulfide inhaled by a human body can be fatal in a short time. Therefore, effective removal of hydrogen sulfide from drilling fluids is a significant task that is not negligible in safe drilling operations. Meanwhile, the hydrogen sulfide causes great economic loss to the damage of hydrogen embrittlement and metal deterioration of the high-strength drilling tool in the well drilling and completion process.
Over the years, researchers at home and abroad carry out a great deal of research on the problem of removing hydrogen sulfide, and at present, methods for removing hydrogen sulfide are many and mainly comprise a dry method, a wet method and a biological method, but the methods mainly aim at water-based drilling fluid. For example, chinese patent publication No. CN108194041A, published as 2018, 6 and 22 discloses a method for removing hydrogen sulfide gas in drilling, which relates to the field of underbalanced drilling operation of sulfur-containing oil and gas wells, and comprises the following steps: in the closed underbalance construction, drilling fluid containing hydrogen sulfide and rock debris enters a closed vibrating screen through a liquid inlet, the drilling fluid passes through a vibrating screen, the rock debris and the drilling fluid are separated by the screen, the rock debris falls to a spiral debris removal mechanism, and the rock debris is sent out of the closed vibrating screen through the spiral debris removal mechanism; the drilling fluid is filtered by the screen mesh and enters a liquid storage tank below the screen mesh, and is pumped into a circulating tank through a liquid pump; the vacuum pump is always started, and the pumped gas is conveyed to a gas outlet of the separator for treatment; the drilling fluid contains hydrogen sulfide gas which is vibrated and volatilized by the vibrating screen, and the hydrogen sulfide gas is monitored by the hydrogen sulfide probe, and the desulfurizing agent is sprayed on the vibrating screen by the desulfurizing agent spraying port to further remove the hydrogen sulfide attached to the surfaces of the drilling fluid and rock debris.
It is generally considered that hydrogen sulfide is not dissolved in the oil-based drilling fluid, and oil covering on the metal surface can play a role of a protective film, but in the actual drilling process using the oil-based drilling fluid, due to the high content of hydrogen sulfide, under the simultaneous action of bottom hole pressure and temperature, hydrogen sulfide can still be dissolved in the oil-based drilling fluid, such as: a large amount of hydrogen sulfide is detected in the oil-based drilling fluid used in wells in Chongqing areas, and the content of the hydrogen sulfide reaches 2000 ppm. Existing methods for removing hydrogen sulfide have not been suitable for oil based drilling fluids.
Disclosure of Invention
The invention aims to provide a method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution, aiming at overcoming the defects and shortcomings of the prior art.
The invention is realized by adopting the following technical scheme:
the method for removing hydrogen sulfide in the oil-based drilling fluid by using the basic zinc carbonate aqueous solution is characterized by comprising the following steps of:
a. selecting a circulating tank on site, adding clear water, adding 30-50% of basic zinc carbonate (the higher the concentration is, the better the hydrogen sulfide removal effect is, but the basic zinc carbonate contains 20% of carbonate by mass fraction, and the carbonate can be combined with calcium ions in the drilling fluid to generate precipitate, so that the drilling fluid generates slight flocculation, and indoor experiments prove that the drilling fluid loses fluidity and is not easy to adjust after the addition of the basic zinc carbonate exceeds 50%, so that the recommended addition is up to 50%), adding 1.5% of pH regulator (aiming at ensuring that the pH value of a drilling fluid system is about 11 to achieve the basic requirement of maintaining the colloidal stability of the drilling fluid), fully stirring until the basic zinc carbonate is completely dissolved in the clear water, measuring that the pH value of the solution is more than or equal to 11, if the pH value is less than 11, continuing to supplement the pH regulator until the requirement of the pH value is met, the obtained solution is water-soluble glue solution to be used in the next step;
b. and (2) selecting a circulating tank on site, adding base oil which is equivalent to 80% of the volume of the tank body and is used by the site oil-based drilling fluid by mass percent, reserving 20% of space for adding the following treating agent, and ensuring that the space for full stirring is reserved. Adding 3% of emulsifier, 3% of wetting agent and 3% of filtrate reducer (the proportion is the fixed addition proportion of the formula of the on-site oil-based drilling fluid) used by the formula of the on-site oil-based drilling fluid into base oil, fully stirring the mixture until the mixture is completely dissolved, and obtaining a solution which is an oil-based glue solution to be used in the next step;
c. injecting the prepared water-soluble glue solution into the oil-based drilling fluid which is used on site, simultaneously supplementing the oil-based glue solution prepared on site, and ensuring that 4 parts of oil-based glue solution is supplemented every time 1 part of water-soluble glue solution is supplemented (by the method, the oil-water ratio of the oil-based drilling fluid on site can be ensured to be 80:20, and the oil-based drilling fluid on site is not greatly influenced after the oil-based glue solution is added), so that the hydrogen sulfide in the oil-based drilling fluid can be removed.
The pH regulator is quicklime.
The emulsifier is amide ester.
The wetting agent is lecithin.
The fluid loss additive is sulfonated resin.
The base oil is white oil or diesel oil.
Compared with the prior art, the invention has the following beneficial effects:
1. in the invention, a process method formed by three steps of abc is adopted, the method for removing hydrogen sulfide in the oil-based drilling fluid by using the basic zinc carbonate aqueous solution is innovatively provided, the hydrogen sulfide dissolved in the oil-based drilling fluid can be effectively removed, the field configuration is convenient, the operation is easy, and the removing effect is good.
2. In the invention, the best technical effect is obtained by the setting mode that the addition amount of the basic zinc carbonate is 30-50 percent and the pH value of the solution is more than or equal to 11 according to experimental data.
3. According to the invention, the ratio of the water-soluble glue solution to the oil-based glue solution is 1:4 (the ratio can ensure that the oil-water ratio of the on-site oil-based drilling fluid is 80:20, and the oil-based drilling fluid does not have great influence on the on-site oil-based drilling fluid after being added), 3% of emulsifier, 3% of wetting agent and 3% of filtrate reducer which are used in the on-site oil-based drilling fluid formula are added into the base oil, and the optimal technical effect is obtained by the set mode according to experimental data.
Detailed Description
Example 1
The invention discloses a method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution, which comprises the following steps:
a. selecting a circulating tank on site, adding clear water, adding 30% of basic zinc carbonate (the higher the concentration is, the better the hydrogen sulfide removal effect is, but the basic zinc carbonate contains 20% of carbonate in mass fraction, and the carbonate can be combined with calcium ions in the drilling fluid to generate precipitate, so that the drilling fluid generates slight flocculation, and indoor experiments prove that the drilling fluid loses fluidity after the addition of the basic zinc carbonate exceeds 50%, and the basic zinc carbonate is not easy to adjust, so the recommended addition is up to 50%), adding 1.5% of pH regulator (aiming at ensuring that the pH of a drilling fluid system is about 11 and the basic requirement of maintaining the colloidal stability of the drilling fluid) and fully stirring the basic zinc carbonate to be dissolved in the clear water, and measuring that the pH value of the solution is more than or equal to 11, if the pH value is less than 11, continuously supplementing the pH regulator until the pH value requirement is met, wherein the obtained solution is a water-soluble glue solution to be used in the next step;
b. and (2) selecting a circulating tank on site, adding base oil which is equivalent to 80% of the volume of the tank body and is used by the site oil-based drilling fluid by mass percent, reserving 20% of space for adding the following treating agent, and ensuring that the space for full stirring is reserved. Adding 3% of emulsifier, 3% of wetting agent and 3% of filtrate reducer (the proportion is the fixed addition proportion of the formula of the on-site oil-based drilling fluid) used by the formula of the on-site oil-based drilling fluid into base oil, fully stirring the mixture until the mixture is completely dissolved, and obtaining a solution which is an oil-based glue solution to be used in the next step;
c. injecting the prepared water-soluble glue solution into the oil-based drilling fluid which is used on site, simultaneously supplementing the oil-based glue solution prepared on site, and ensuring that 4 parts of the oil-based glue solution is supplemented every time 1 part of the water-soluble glue solution is supplemented, so that the hydrogen sulfide in the oil-based drilling fluid can be removed.
Example 2
The embodiment provides a method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution. H in oil-based drilling fluid is removed by mainly relying on water-soluble sulfur removal agent basic zinc carbonate through the following method2And (4) S gas.
Select an 8m in the field3-15m3The method comprises the following steps of circulating a tank, emptying and cleaning, adding 80% of clear water, adding 50% of water-soluble desulfurizing agent (basic zinc carbonate) and 1.5% of pH regulator (quicklime) into the clear water, fully stirring until the clear water is completely dissolved in the clear water, testing the pH value of the solution to be more than or equal to 11 through a pH test paper, and if the tested pH value is less than 11, supplementing 0.5% of pH regulator (quicklime) until the requirement of the pH value is met, wherein the solution is water-soluble glue solution to be used next step.
2. Selecting a volume of 40m in situ3-50m3The circulation tank is emptied, cleaned and taken out, 80% of base oil (white oil, diesel oil and the like) used by the field oil-based drilling fluid is added, 3% of emulsifier, 3% of wetting agent and 3% of filtrate reducer used by the field oil-based drilling fluid formula are added into the base oil, and the mixture is fully stirred to be completely dissolved, wherein the solution is oil-based glue solution to be used in the next step.
3. Slowly injecting the prepared water-soluble glue solution into the oil-based drilling fluid which is used on site, simultaneously supplementing the oil-based glue solution prepared on site, and ensuring that 1 part of water-soluble glue solution is supplemented and 4 parts of oil-based glue solution are supplemented.
The emulsifier is amide ester.
The wetting agent is lecithin.
The fluid loss additive is sulfonated resin.
The base oil is white oil or diesel oil.
Example 3
According to the invention, the ratio of the water-soluble glue solution to the oil-based glue solution is 1:4 (the ratio can ensure that the oil-water ratio of the on-site oil-based drilling fluid is 80:20, and the oil-based drilling fluid does not have great influence on the on-site oil-based drilling fluid after being added), 3% of emulsifier, 3% of wetting agent and 3% of filtrate reducer which are used in the on-site oil-based drilling fluid formula are added into the base oil, and the optimal technical effect is achieved by the set mode according to the supplement of experimental data.
Indoor experiments prove that: the addition amount of the basic zinc carbonate is preferably 30 to 50 percent. The data are shown in the following table:
indoor experiments prove that: the ratio of the water-soluble glue solution to the oil-based glue solution is 1:4 (the oil-water ratio is 80: 20), and the rheological property of the oil-based drilling fluid added on site can not be influenced. The data are shown in the following table:
Claims (6)
1. the method for removing hydrogen sulfide in the oil-based drilling fluid by using the basic zinc carbonate aqueous solution is characterized by comprising the following steps of:
a. selecting a circulating tank on site, adding clear water, adding 30-50% of basic zinc carbonate equivalent to the clear water by mass percent, adding 1.5% of pH regulator, fully stirring until the basic zinc carbonate is completely dissolved in the clear water, measuring the pH value of the solution to be more than or equal to 11, if the pH value is less than 11, continuously supplementing the pH regulator until the requirement of the pH value is met, and obtaining a solution which is a water-soluble glue solution to be used in the next step;
b. selecting a circulating tank on site, adding base oil which is equivalent to 80% of the volume of the tank body and is used by the on-site oil-based drilling fluid in volume percentage, adding 3% of emulsifier, 3% of wetting agent and 3% of filtrate reducer which are used by the on-site oil-based drilling fluid formula into the base oil, fully stirring the mixture until the mixture is completely dissolved, and taking the obtained solution as oil-based glue solution to be used in the next step;
c. injecting the prepared water-soluble glue solution into the oil-based drilling fluid which is used on site, simultaneously supplementing the oil-based glue solution prepared on site, and ensuring that 4 parts of the oil-based glue solution is supplemented every time 1 part of the water-soluble glue solution is supplemented, so that the hydrogen sulfide in the oil-based drilling fluid can be removed.
2. The method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution according to claim 1, wherein the method comprises the following steps: the pH regulator is quicklime.
3. The method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution according to claim 1, wherein the method comprises the following steps: the emulsifier is amide ester.
4. The method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution according to claim 1, wherein the method comprises the following steps: the wetting agent is lecithin.
5. The method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution according to claim 1, wherein the method comprises the following steps: the fluid loss additive is sulfonated resin.
6. The method for removing hydrogen sulfide in oil-based drilling fluid by using basic zinc carbonate aqueous solution according to claim 1, wherein the method comprises the following steps: the base oil is white oil or diesel oil.
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