CN100435903C - Bubbling degasifying apparatus for removing trace low-carbon components in polyether polyol - Google Patents

Abstract

The invention relates to a bubbling degassing device for removing trace low-carbon components in polyether polyols. The degassing device includes a cylinder body, an upper head, a lower head, a jacket and an inert gas bubbling device , the cylinder and the upper head are connected by flanges, and welded with the lower head, the jacket is arranged on the periphery of the cylinder and the lower head, and the bubbling device consists of an air inlet pipe, a bubbling The air inlet pipe is formed by the ring pipe, and the air inlet pipe is connected to the bubble ring pipe at the bottom, and the bubble ring pipe is provided with bubble holes. With the device of the present invention, the trace amount of C ₁ -C ₇ low-carbon components in polyether polyols can be reduced to below 100 μL/L, the fluorescence level is less than 4, the degassing efficiency is greatly improved, and it can fully meet the requirements of drilling lubricants. Require.

Description

Bubble type degassing device for removing trace low-carbon components in polyether polyols

technical field

The invention relates to chemical equipment, in particular to a bubbling degassing device for removing trace low-carbon components in polyether polyols.

Background technique

With the rapid development of modern drilling technology and the continuous improvement of environmental protection requirements, drilling fluid technology is facing severe challenges. During the use of traditional water-based drilling fluids in horizontal wells, directional wells and highly deviated wells, in order to solve the friction between the well wall and the drilling tool, and between the drilling tool and the drilling tool, as well as reduce the sticking of the mud cake and other problems , It is often necessary to add oil lubricants to the drilling fluid. Due to the biological toxicity and fluorescence of oil lubricants, it interferes with geological logging and is not conducive to the discovery of oil and gas layers. The discharge of waste drilling cuttings and drilling fluids causes serious pollution to the environment, especially in oceans, inland lakes and environmentally sensitive areas. The coordinated development of drilling fluid technology and environmental protection is even more important in oil exploration and development. On the basis of extensive evaluation of the environmental protection characteristics of existing polymer drilling fluids, it is necessary to introduce polyether polyol compounds that meet environmental requirements instead of oil lubricants, and to establish an environmentally acceptable polyether polyol water-based drilling fluid system.

With the increasing number of horizontal wells, directional wells and highly deviated wells, in the oil drilling process, it is often necessary to use a large amount of drilling fluid lubricants to reduce the friction between the well wall and the drilling tool, and between the drilling tool and the casing , reduce downhole complex situations, and increase drilling speed. In recent years, great progress has been made in the research of drilling fluid lubricants. Relevant researchers have developed a new type of polyether polyol lubricant, but the polyether polyol lubricant still has the following problems during use: With the polyether polyol The addition of alcohol lubricants is likely to have an adverse effect on the performance of the drilling fluid. The gas chromatographic analysis results of the oil top of the drilling fluid system show that the analysis results of C ₁ -C ₇ low-carbon components are greatly increased, which interferes with geological logging.

Contents of the invention

The object of the present invention is to provide a bubbling degassing device for removing trace low-carbon components in polyether polyols in order to overcome the above-mentioned defects in the prior art.

The purpose of the present invention can be achieved through the following technical solutions:

A bubbling degassing device for removing trace low-carbon components in polyether polyols, the degassing device includes a cylinder, an upper head, a lower head, a jacket, the cylinder and the upper seal The head is connected by flange and welded with the lower head. The jacket is arranged on the periphery of the cylinder and the lower head. It is characterized in that: the degassing device also includes an inert gas bubbling device, and the bubbling device consists of Composed of an air inlet pipe and a bubbling ring pipe, the air inlet pipe enters from the upper head, and its bottom is connected with the bubbling ring pipe, and the bubbling ring pipe is provided with bubbling holes.

The air inlet pipe is arranged parallel to the axis of the cylinder, and the bubbler ring is arranged perpendicular to the axis of the cylinder.

The bubble holes are distributed inside and outside the lower part of the bubble ring tube.

The inner bubbling holes and two adjacent outer bubbling holes are arranged in a triangle, and the included angle α is 5°-175°.

The inner bubbling holes and the adjacent two outer bubbling holes are arranged in a triangle, and the included angle α is preferably 110°-130°.

The inner bubbling holes and the two adjacent outer bubbling holes are arranged radially in a non-planar fan shape along the cross-section of the ring tube, and the included angle β is 5°-175°.

The inner bubbling holes and the two adjacent outer bubbling holes are arranged in a non-planar fan shape along the radial direction of the cross section of the ring tube, and the included angle β is preferably 80°-100°.

The diameter of the bubble hole is 1-50 mm.

The diameter of the bubble holes is preferably 2-8mm.

The ratio of the diameter of the bubbling ring tube to the inner diameter of the cylinder is d/D=0.1-1.

The ratio of the diameter of the bubbling ring tube to the inner diameter of the cylinder is preferably d/D=0.3-0.7.

The inert gas is selected from one of nitrogen, carbon dioxide or helium.

The inert gas is preferably nitrogen.

The detection method of C ₁ -C ₇ low carbon components and fluorescence in polyether polyol is as follows:

The fluorescence of 2% polyether polyol lubricant aqueous solution was measured by YZ-1 petroleum fluorescence analyzer.

According to the Petroleum and Natural Gas Industry Standard of the People's Republic of China SY 5259-91 "Gas Chromatographic Analysis Method for Light Hydrocarbons in Debris Tank Top Gas", the light hydrocarbon samples naturally desorbed from the material are separated in the chromatographic column and detected by a hydrogen flame detector , after data processing, the content of each component of C ₁ -C ₇ light hydrocarbons is obtained.

The total content of each component of C ₁ -C ₇ light hydrocarbons in general drilling fluid lubricants is less than 100 μL/L; the fluorescence level of general drilling fluid lubricants is less than the standard of grade 4.

The test results show that, with the device of the present invention, the trace C ₁ -C ₇ low-carbon components in the polyether polyol can be reduced to less than 100 μL/L, the fluorescence level is lower than the standard of level 4, and the degassing efficiency is greatly improved. Can meet the requirements of drilling lubricants.

Description of drawings

Fig. 1 is the structural representation of bubble type degassing device of the present invention;

Fig. 2 is a schematic diagram of direction A of Fig. 1;

Fig. 3 is a B-B sectional view of Fig. 2 .

Detailed ways

The present invention will be further described below in conjunction with specific comparative examples and examples.

The raw material polyether polyol material that comparative example and embodiment adopts, according to People's Republic of China petroleum and natural gas industry standard SY 5259-91 " gas chromatographic analysis method of light hydrocarbon in cuttings tank top gas ", the light hydrocarbon test that material naturally desorbs The sample is separated in a chromatographic column, detected by a hydrogen flame detector, and the content of each component of C ₁ to C ₇ light hydrocarbons is obtained after data processing.

Test results: methane 32.35 μL/L, ethane 52.28 μL/L, propane 87764.09 μL/L, isobutane 25.03 μL/L, n-butane 18.14 μL/L, isopentane 14.76 μL/L, n-pentane 23.68 μL/L, the total amount is 87930.33μL/L. The fluorescence of 2% polyether polyol lubricant aqueous solution was measured by YZ-1 petroleum fluorescence analyzer, and the fluorescence level was 2.

Comparative example 1

This comparative example is an example of not feeding inert gas to remove trace low-carbon components in polyether polyol. The process steps of this example are as follows: the polyether polyol material is pumped into the degassing device, the vacuum system is opened, and the temperature is controlled at 110 °C, the pressure is 0.02Mpa, and the time is 6 hours, to remove trace C ₁ -C ₇ components in the material, then cool down to 40 °C, and discharge the material for packaging. According to the Petroleum and Natural Gas Industry Standard of the People's Republic of China SY 5259-91 "Gas Chromatographic Analysis Method for Light Hydrocarbons in Debris Tank Top Gas", the light hydrocarbon samples naturally desorbed from the material are separated in the chromatographic column and detected by a hydrogen flame detector , the content of each component of C ₁ -C ₇ light hydrocarbons can be obtained after data processing.

Test results: methane 18.52 μL/L, ethane 52.45 μL/L, propane 48368.28 μL/L, others were not detected, the total amount was 48439.25 μL/L. The fluorescence of 2% polyether polyol lubricant aqueous solution was measured by YZ-1 petroleum fluorescence analyzer, and the fluorescence level was 6.

Comparative example 2

This comparative example is an example in which an inert gas is directly fed into the feed port of the degasser to remove trace low-carbon components in the polyether polyol. The process steps of this example are as follows: the polyether polyol material is pumped into the degasser, Introduce nitrogen with a purity of 99.99% into the degassing device system, turn on the vacuum system, control the temperature at 100°C, the pressure is 0.04Mpa, the time is 4 hours, the inert gas flow rate is 12 kg/hour, and the trace amount of nitrogen in the material is removed. C ₁ ~ C ₇ components, then lower the temperature to 40°C, and pack them out. According to the Petroleum and Natural Gas Industry Standard of the People's Republic of China SY 5259-91 "Gas Chromatographic Analysis Method for Light Hydrocarbons in Debris Tank Top Gas", the light hydrocarbon samples naturally desorbed from the material are separated in the chromatographic column and detected by a hydrogen flame detector , the content of each component of C ₁ -C ₇ light hydrocarbons can be obtained after data processing.

Test results: methane 22.48 μL/L, ethane 21.43 μL/L, propane 19287.23 μL/L, others were not detected, the total amount was 19331.14 μL/L. The fluorescence of 2% polyether polyol lubricant aqueous solution was measured by YZ-1 petroleum fluorescence analyzer, and the fluorescence level was 4.

Example

This embodiment is an example of using the bubbling degassing device of the present invention to remove trace low-carbon components in polyether polyols.

As shown in Figures 1 to 3, a bubbling degassing device for removing trace low-carbon components in polyether polyols, the degassing device includes a cylinder 1, an upper head 2, and a lower head 3 , a jacket 4, an inert gas bubbling device 5, the cylinder 1 is connected to the upper head 2 through a flange 6, and welded to the lower head 3, and the jacket 4 is arranged on the cylinder 1 and the lower The periphery of the head 3, the inert gas bubbling device 5 is composed of an air inlet pipe 51 and a bubbling ring pipe 52, the air inlet pipe 51 is connected to the bubbling ring pipe 52 from the upper head. And communicated, the bubble ring 52 is provided with a bubble hole 521 .

The air inlet pipe 51 is arranged parallel to the cylinder axis, and the bubbling ring pipe 52 is arranged perpendicular to the cylinder axis. The bubble holes 521 are distributed inside and outside the lower part of the bubble ring tube 52 . The inner bubbling holes and two adjacent outer bubbling holes are arranged in a triangle, and the included angle α is 120°. The inner bubbling holes and the two adjacent outer bubbling holes are arranged radially in a non-planar fan shape along the cross-section of the ring tube, and the included angle β is 90°. The ratio of the diameter of the bubbling ring tube to the inner diameter of the cylinder is d/D=0.5. The inert gas is helium.

The process steps of this embodiment are as follows: the polyether polyol material is pumped into the degasser, an inert gas with a purity of 99.99% is introduced into the degasser system, the inert gas component is nitrogen, the vacuum system is turned on, and the temperature is controlled At 120°C, the pressure is 0.03Mpa, the time is 1.5 hours, the inert gas flow rate is 6 kg/hour, and the trace C ₁ -C ₇ components in the material are removed, and then the temperature is lowered to 40°C, and the material is packaged. According to the Petroleum and Natural Gas Industry Standard of the People's Republic of China SY5259-91 "Gas Chromatographic Analysis Method for Light Hydrocarbons in Debris Tank Top Gas", the light hydrocarbon samples naturally desorbed from the material are separated in the chromatographic column and detected by a hydrogen flame detector. After data processing, the content of each component of C1-C7 light hydrocarbons is obtained. Test results: Propane 37.63 μL/L, others were not detected, the total amount was 37.63 μL/L. The fluorescence of 2% polyether polyol lubricant aqueous solution was measured by YZ-1 petroleum fluorescence analyzer, and the fluorescence level was 2.

It can be seen that, using the bubbling degassing device of the present invention, the trace amount of C ₁ -C ₇ low-carbon components in polyether polyols can be reduced to 37.63 μL/L, the fluorescence level is only 2, and the degassing efficiency Greatly improved, fully able to meet the requirements of drilling fluid lubricants.

Claims (2)

1. bubbling degasifying apparatus that is used for removing the PPG trace low-carbon components, this degasser comprises cylindrical shell, upper cover, low head, chuck, described cylindrical shell is connected by flange with upper cover, adopt welding with low head, described chuck is located at the periphery of cylindrical shell and low head, it is characterized in that: this degasser also comprises the inert gas bubbling device, this bubbling device is made up of air inlet pipe, bubbling endless tube, described air inlet pipe is fed by the upper cover place, its bottom is connected with the bubbling endless tube, and described bubbling endless tube is provided with the bubbling hole;

Described bubbling pore size distribution is in the lower inside and the outside of bubbling endless tube;

The bubbling hole in the inboard bubbling hole and the two adjacent outsides is triangularly arranged, and is that the angle α on summit is 110 °～130 ° with the bubbling hole of inboard wherein;

Described bubbling bore dia is 1～50mm;

Described bubbling endless tube diameter is d/D=0.3～0.7 with the ratio of cylinder internal diameter;

Described inert gas is selected from a kind of in nitrogen, carbon dioxide or the helium;

Described low-carbon components is C ₁-C ₇Low-carbon components.

2. the bubbling degasifying apparatus that is used for removing the PPG trace low-carbon components according to claim 1 is characterized in that: described bubbling bore dia is 2～8mm.

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