RU1790592C - Compound for bath setting when releasing drill pipes seized in boreholes - Google Patents

Abstract

The composition has lower surface tension values and zero CHS values, i.e. significantly higher lubricating properties due to the content of DEMAN - modified monoethanolamine polymethyl methacrylate (0.5 - 1.0 wt.%) monoethanolamine (0.6 - 1.2 wt.%), tall oil (2.8 - 5 , 6 wt.%), Amifole - a mixture of ammonium salts, phosphorous, nitrilotrimethylphosphonic and methyliminodimethylphosphonic acids (0.1-0.6 wt.%) And water (ost.). 1 tab.

Description

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The invention relates to the oil and gas industry and can be used to release pipes stuck in a well.

A bath composition is known which is used to release pipes that have been caught in a well, and containing, in wt%: CMC 3-4, surfactant OP-10 1-3, and an aqueous solution of potassium acetate - the rest.

A disadvantage of the known solution is the low efficiency of the release of stuck pipes due to the presence of a low-effective surfactant and mineral salts in the bath.

The closest to the claimed decision on the technical nature and the achieved effect is a composition for installing bathtubs containing, wt.%: Surfactant OP-10 2-3, polyacrylamide 1-2, caustic soda 1-2 and an aqueous solution of ammonium nitrate 94 -95.

A disadvantage of the known solution is its low efficiency associated with

the presence of mineral salts and an ineffective surfactant, giving it low lubricating properties and the inability to reduce surface tension to 20 days / cm and lower.

The purpose of the invention is to increase the efficiency of the release of stuck pipes by increasing the lubricating properties and lowering the surface tension of the composition.

This goal is achieved in that the composition for installing bathtubs when releasing the pipes stuck in the well, containing acrylic polymer, a surfactant, a salt additive and water, as an acrylic polymer contains daman - a modified monoethanolamine polymethylmethacrylate as a surfactant - a mixture of monoethanolamine and tall oil, as a salt additive - amiphol - a mixture of ammonium salts of salt, phosphorous, nitrilotrimethylphosphonic and methyliminodimethylphosphonic acid | Oh Oh

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lots in the following ratio of components, wt.%:

Daman - modified with monoethanolamine polymethyl methacrylate 0.5-1.0 Monoethanolamine 0.6-1.2 Tall oil 2.8-5.6 Amifol - a mixture of ammonium salts of salt, phosphorous, nitrilotrimethylphosphonic and methyliminodimethylphosphonic acids 0.1-0.6 Water Other The essence of the invention is as follows. A bath is installed at the pipe sticking point, the composition of which includes the following components: an acrylic polymer modified with monoethanolamine; Surfactant, which includes monoethanolamine; salt supplement - amifol is a mixture of ammonium salts of mineral and organic acids. The selection of reagents containing amino derivatives gives the following effect: the adsorption and proppant action of the reagents increases (PA Rebinder effect), as if cleaving clay particles, which caused sticking. This mechanism of action - release of the stuck pipe is caused by such properties of the composition as lubricants and the ability to reduce interfacial tension. In the composition of the invention, amine derivatives are reagents that increase the lubricating and surface-active properties. The composition was therefore selected in such a way that, with the minimum required amount of components, the amino derivatives are included in all reagents indicated in the invention.

Daman - modified monoethanolamine polymethyl methacrylate is produced by the Dzerzhinsky Production Association Plexiglass in the form of a 30% aqueous concentrate. By its properties, the reagent used in the work corresponded to the requirements of TU 6-01-873-86.

Tall oil met the requirements of OST 13184-83E, monoethanolamine TU 6-02-915-79, amifol TU 6-09-20-157-89.

The technology for preparing the composition consists in dissolving the components in water in the required amount. Then the bath is installed at the sticking point, at a certain pressure and temperature, the pipe release force is determined. Example 1. Prepare 1.5 l of a composition containing 0.5% (7.5 g of deman, 25 ml of an aqueous concentrate of a standard product) deman, 2.8% (42 g; 46.8 ml) of tall oil, 0, 6% (9 g, 9.2 ml) of monoethanolamine, 0.1% (1.5 g; 5 g of concentrate) amifole and the rest is water. The prepared composition in the form of a bath is installed at the place of accumulated sticking with a clay crust and incubated for 30 minutes at 150 ° C and 15.0 MPa. The tube release force is then determined. It is equal to 96 kG.

Example 2. A bath composition is prepared containing 1.5% of deman (12 g; 40 ml of concentrate) in a volume of 1.5 l; 1.0% monoethanolamine (15 g; 14.7 ml); 4.65% tall oil (69.75 g; 77.7 ml); 0.4% amifol (6 g; 20 g of concentrate) and the rest is water. The composition has a pH of 14, a surface tension of 10.7 days / cm, SNS O / O dPa. Then the bath is installed in place of the accumulated sticking of the pipe with a clay crust and incubated for 30 min at 150 ° C and the addition of 15 MPa. The tube release force is determined. It is equal to 67 kgf.

Example 3. 1.5 L of a composition containing 1% deman (15 g; 50 g of concentrate) was prepared; 1.2% monoethanolamine (18 g; 17.6 ml); 5.58% tall oil (83.7 g; 93.2 ml); 0.6% amifol (9 g; 30 g of concentrate) and the rest of the water. The composition has a surface tension of 8.3 days / cm, SNA O / O dPa, pH 14. The bath is installed for 30 minutes in place of the stuck accumulated by the clay crust and maintained at 150 ° C and a pressure of 15.0 MPa. The tube release force is then determined. It is equal to 50 kG.

Other examples are given in the table.

From their consideration it is clear that the proposed composition is more effective than the known one, since it requires less conditions for the release of the stuck pipe. Moreover, the proposed composition has lower surface tension values and zero SNA values, i.e. significantly higher lubricating properties; optimal concentrations of reagents in the proposed composition are the following, wt.%:

Daman0.5-1.0 Amifol 0.1-0.6 Monoethanolamine 0.6-1.2 Tall oil 2.8-5.6 Water Remaining At concentrations below the lower limit, the pipe release force is almost the same as that of composition of the prototype. At concentrations above maximum, there is almost no improvement in formulation quality.

The proposed composition was tested in 6 wells in the north of the Tyumen region.

Claims (1)

The time of elimination of the stick was reduced to 1 hour. In addition, the composition of the Formula of the invention A composition for installing bathtubs during the release of pipes stuck in the well, containing acrylic polymer, a surfactant, a salt additive and water, characterized in that, in order to increase the efficiency of releasing the stuck pipes by increasing the lubricating properties and lowering the surface tension of the composition It contains, as an acrylic polymer, deman - polymethylmethacrylate modified with monoethanolamine, as a surfactant - a mixture of monosetanolamine and tall oil, as salt howl additives - amifol - ammoniySostavy blend and properties of the developed solutions for the installation of baths It has high anticorrosive properties. salts of hydrochloric, phosphorimetricphosphonic and methylimonyl background acid with the following components, wt.%: Daman - modified with monoethanolamine polymethylmethacrylate Monoethanolamine Tall oil Amifol - a mixture of ammonium salts of hydrochloric, phosphorous, nitrilotrimethylphosphonic and methylimonodimethylodiophosphonic acid