SU1470934A1 - Buffer fluid for separating hydrocarbon-base drilling mud and aqueous plugging composition - Google Patents

Abstract

The invention relates to the construction of oil and gas wells. The goal is to increase the separation capacity of the fluid by increasing the sedimentation stability of the buffer fluid while reducing the consumption of diesel fuel and reducing the time it takes to prepare it. The liquid contains the following ingredients in their ratio, wt.%: Diesel fuel 8.7-14.0, a mixture of petroleum waste containing oil and diesel fuel, 12.2-30.0 - waste of benzene production, - alkaline waters of benzene distillation or condensed sulfite-alcohol bard 0.8-1.0, betonitovy clay 2.0-7.0, water 2.0-8.0, the rest barite. Waste production of benzene is used as an emulsifier. The liquid is prepared by sequential mixing and continuous mixing of the ingredients contained in it. 3 Table 3. 0

Description

one

The invention relates to the construction of oil and gas wells, in particular, to buffer liquids used in fixing wells drilled with hydrocarbon-based drilling fluids, and with water-based cement slurries.

The purpose of the invention is to increase the separating ability of the buffer fluid due to the increase in its sedimentation stability while reducing the consumption of diesel fuel and reducing the time for its preparation.

Buffer fluid for separating hydrocarbon-based mud and cement slurry. On

water-based contains diesel fuel, a mixture of petroleum waste (CHO) containing oil and diesel fuel, water, bentonite clay, barite and as an emulsifier waste production of benzene - alkaline waters of benzene rectification (SCHVRB) or condensed sulfite-alcohol bard (KSSB) the following ratio of ingredients, wt.%:

about co °

00

SSS

Diesel fuel

SHVRV

or kssb-2

Bentonite clay

Water

12.20-30.00 8.7-14.0 2.0-2.8. 0.8-1.0 2.0-7.0 2.0-8.0

Barite (1 step

AtoN is a KpyriHOTOHHiUKHbrii oil waste stream, which is discharged from tankers into sediment on oil depots. The use of this waste as part of a buffer fluid allows the consumption of diesel fuel to be reduced.

The SNO includes oil, fuel oil, bitumen, diesel fuel, water and

mechanical impurities. The waste is a homogeneous dark-colored liquid with a conditional viscosity of 630 s at 25-26 ° C.

1CVRB - waste production of benzene, scrubbing during alkali washing in benzene rectification workshops. The SCRB includes fatty acid salt salts, sodium sulfate, caustic sodium, and water. The studies of SHRB showed that their chemical composition is almost the same, since the technologists of the preparation of the benzene – toluene – xylene fraction, which resulted in the crawling of the waste of SHVRB, are identical at all to chemical plant ah. The components which are a part of SHVBB possess surface-active properties, SCHRB can be used for preparation of buffer liquids containing calcium ions, barium and magnesium, as at interaction with these ions, SCHRB does not lose surface-active properties. In addition, the caustic soda in the SCRB composition creates in the buffer liquid pH 9.2-i1.8, which facilitates the emulsification process, provides the buffer liquid more highly dispersive, and consequently, higher sedimentation stability.

  Table 1 shows the compositions of the buffer liquids under study; 2 - data illustrating the dependence of the conventional viscosity and the character of the dispersion medium on the quantitative content of the buffer liquid ingredients, in table. 3 - data illustrating the strength of the cement contact with the metal surface of the casing.

Buffer fluids, the composition of which is within the indicated limits, are compatible with drilling and cement slurries. Mixing these buffer liquids in a 1: 1 ratio with drilling and cement slurries does not lead to sushi, and there is a significant increase in the viscosity of the mixtures, which is indicative of.

with

YU

15 20 25 30 .es 40

.g

50

five

their good section is the ability.

Studies of the adhesion strength of cement stone to a metal surface after it was treated with buffer liquid layers were carried out according to the following procedure. A metal steel ring with a standard lateral surface area is installed in a vertical tube on an installation for studying the processes of gravitational replacement of buffer liquids. Then, the buffer fluid under test is passed through the ring, which is forced through, with a cement mortar to remove residual buffer solution from the annulus. After that, the ring is taken out, filled in with a suitable solution (, 5) and left at rest for 48 hours to form a cement stone at normal atmospheric pressure. After the cement stone has been formed, the ring is placed under the press and the force required to force the cement stone out of the ring is recorded.

I

Knowing the geometric dimensions of the ring and the expended force of extrusion of the cement stone, determine the stress of separation of the cement stone from the metal surface. It was found that the buffer liquid has almost no negative effect.

Example. In 220 g of CHO (22%) with continuous stirring, 104 g (10.4%) of diesel fuel are introduced, and then 20 g (2%) of the emulsifier containing 0.4% of dry fuel is added to the mixture, 30 ml of water (3%), 30 g of bentonite (3%) and emulsified for 10-12 minutes, after which the emulsion is thinned with barite, injected in an amount of 596 g (59.6%) and emulsified for 10 - 12 min. Until a homogeneous dark brown liquid is obtained. After the end of emulsification, 1000 g of buffer liquid is obtained.

Formula aiz gain

Buffer fluid for separating hydrocarbon-based drilling mud and water-based cement slurry, including diesel, emulsifier, water and barite,

51

characterized by the fact that, in order to split its capacity by increasing the sedimentary stability of the buffer liquid while reducing the consumption of diesel fuel and reducing the time of its preparation, it additionally contains a mixture of oil - waste and diesel oil topdiro, and bentonitor clay, and as a wastewater, benzene production waste - alkaline waters of benzene distillation; uti condensed sulfite-alcohol bard in the following ratio of ingredients, wt.%:

Diesel fuel

Oil Waste Blend Containing Oil and Diesel

Waste from the production of benzene alkaline waters of benzene rectification or condensed sulfite-alcohol bard

Bentonite clay

Water

Barite

3 4 5 6 7 8

Table j

h

Table 2

97 94 85 93 71 82 90 68

Table 3

Variants of the compositions with the ratio of ingredients,%

Pure metal ring without buffer fluid Known for:

Diesel fuel27,03

Emulsifier OP-40,28

Water26,86

Barite45,83

Buffer fluid:

Oil Waste Blend 27

Diesel fuel13

Emulsifier SCHVRB2

Water2

Bentonite5.

Barite66,3

Buffer fluid

Oil Waste Mix 30

Diesel fuel 11g.

KSSB emulsifier .0,8 Water-8

Bentonite3

Barite47.2

The shear strength of a cement stone with a metal surface after two days of hardening of the cement stone. Pa-10

Claims (1)

Claim "Buffer fluid of the day of separation of the hydrocarbon-based drilling fluid and the water-based cement slurry, including diesel fuel, emulsifier, water and barite,” 5 1470934 characterized in that, in order to increase its separating ability by increasing the sedimentation stability of buffer fluid _g while reducing diesel fuel consumption and reducing the time of its preparation, it additionally contains a mixture of petroleum waste containing oil and diesel 10 topro , and bentonite clay, and the quality of the emulsifier is a waste of benzene production - alkaline waters of benzene rectification go condensed sulphite-alcohol vinasse with the following ¹⁵ ratio of ingredients, wt.%: Diesel fuel 8.7-14.0 A mixture of petroleum waste dov containing oil and diesel fuel 12.2-30.0 Production waste benzene - alkaline river waters benzene or condensed sul fitno - alcohol about in barda 0.8-1.0 Bentonite clay 2.0-7.0 Water 2.0-8.0 Barite Rest T a b l i c g 1 SOS- tav Oil waste mixture Diesel fuel ShchV? B KSSB Water Bentonite Barite 1 16.0 8.7 2.0 - 20 5,0 66.3 2 22.0 10,4 2.0 - 2.0 2.0 60.6 3 23.5 11.2 2.0 - 4.0 7.0 52.3 4 30,0 11.0 2,8 - 8.0 7.0 42.8 5 27.0 13.0 2.0 —- 4.0 s oh 51 6 ’ 14.0 14.0 - 0.8 3.0 2.0 66,2 7 22.0 10,4 - 1,0 2.0 s oh 59.4 8 30,0 11.0 - 0.8 8.0 3.0 47.2 Table 2 Composition Density, g / cm ³ Conditional viscosity at 26 ° C, s 1 2.01 97 , 2 1.83 94 3 1.70 85 4 1,50 93 5 1,56 71 6 1.88 82 7 1 1.76 90 8 1,59 68 Table 3 Formulation options with the ratio of ingredients,% The shear strength of the cement stone with the metal surface after two days of hardening of the cement stone, Pa-10 ⁵ Pure metal ring tso without buffer fluid 19.3-21.0 Famous: 19.8-21.6 Diesel fuel 27.03 Emulsifier OP-4 0.28 Water 26.86 Barite 45.83 - Buffer fluid: 20,2-21,8 A mixture of oil waste 27 Diesel fuel thirteen Emulsifier ЩВРБ 2 Water 2 Bentonite 5 Barite 66.3 - Buffer fluid 19,4-21,7 A mixture of oil waste thirty Diesel fuel eleven, Emulsifier KSSB · 0.8 Water '- - 8 Bentonite 3 Barite 47.2 - Compiled by L. Bestuzhev Editor And, Mountain Tehred M. Didyk Corrector S. Shekmar Order 1566/37 Circulation 514 Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035, Moscow, Zh-35, Raushskaya nab., D. 4/5 Production and Publishing Plant Patent, Uzhgorod, st. Gagarina, 101