SU1209604A1 - Invert emulsion for killing wells - Google Patents

Description

FIELD OF THE INVENTION The invention relates to the oil and gas industry in particular to liquids used in well plugging.

The purpose of the invention is to increase the aggregative stability, increase the processing efficiency of the downhole zone of the reservoir, and also reduce material costs.

The addition of vat residue production of high molecular weight amines provides an increase in the aggregative stability of the system in a temperature range of 20–95 s and an increase in dissolving capacity with respect to asphalt-resin and paraffin deposition, which allows it to be used simultaneously to kill wells and hot) and for treatment in the downhole zone of the reservoir during the underground repair of wells.

The bottoms residue from the production of high molecular weight amines - Cso is a waste and is a solid of a light brown color, m.p. 58-66; dissolved in a hydrocarbon medium and having the following composition, wt.%;

Hydrocarbons 33,, 9 Primary amines 23.7-24.9 Secondary amines 39,, 9 Oxidized petrolatum is an oxidation product of a mixture of paraffins and ceresins and contains high molecular weight fatty acids (acid number 60-70 mg KOH per 1 g of the product).

To prepare the emulsion, a mixture of oil and distillate, a broad fraction of light hydrocarbons produced in oil treatment plants, is used as an oil product. Calcium chloride solution with a density of 1180 kg / m is taken as saline water,

Invert emulsions are prepared as follows.

In the petroleum product oil and distillate in the 1: 1 ratio, with stirring, a successively specified amount of oxidized petrolatum and the bottoms of high molecular weight amine production are introduced. Then, saline water is gradually added and vigorously mixed; the emulsions are sewn until a constant

the values of the voltage electro-breakdown (electrostability), which characterizes the aggregate stability of the emulsion.

Under laboratory conditions, c -ai-emulsion tests are carried out at various ratios of components for the evaluation of technological parameters: aggregative stability,

bone static stress and dissolving capacity with respect to asphalt-resinous and paraffin deposits. Aggregative stability is assessed by the electrical stability parameter (B) on an IGER-1 instrument, viscosity (s) on the instrument, static shear stress ( mgs / cm) on the SNS-2 device. The dissolving ability of emulsions is estimated

Next: A sample of deposits extracted directly from the well, in the form of a tablet with a thickness of 5 mm, is dipped into hermetically sealed vessels with the same amount of emulsion and through one and

Two days determine the percentage dissolution of deposits by the difference in mass before and after soaking them in the emulsion. The ratio of the mass of sediment to volume

the emulsion is the same and is 1:25. For comparison, a known emulsion is tested, the mixture being taken as the dispersion medium. oil and distillate, as dispersed. phases - chloride solution.

 / L

calcium density of 1180 kg / m. In addition, the proposed and known emulsions are tested for resistance to elevated temperatures.

The emulsion compositions and test results are shown in Table 1 and 2. As follows from the data in Table 1,

The optimum concentration of the bottom residue is 1.5-3.0% by volume. At a concentration below 1.5 vol.%, A decrease in electro-stability and a dissolving ability is observed,

and at a concentration of 3.0 v%,%; no improvement in parameters. From the data table. 1 also follows,. that the addition of vat residue production of high molecular amines

provides for the increase of

the stability of the proposed emulsion is 2.4–2.6 times and the decrease of the dissolving ability by 4 times in one

day and 2.6 times in two days compared with the known. From the data - Table. 2, it is clear that the emulsion is known.

Distil t

Oxidized Petrolatum

VAT residue

Calcium chloride solution (kg / m) 46.6 270

Oil Distil t

Oxidized Petrolatum

VAT residue

Calcium chloride solution (d-1180 kg / m) 17 370

Oil Distil t

Oxidized Petrolatum

VAT residue

Solution

calcium chloride (d- 1180 6 380

Oil Distil t

Oxidized Petrolatum

The si is completely destroyed at 70 ° C, and the proposal remains stable at.

Table 1

160

22 28

60

72

120

24 28

80

90

180

34 LO

.82

93

VAT residue

3.0

Calcium Chloride Solution (kg / m) 64.5 390

210

25

25

2.0

3.1

44.9 360 180

Known

Oil

Distil t

Oxidized Petrolatum

Emultal

70

150

420

Continued table.

36

42

80

90

36

40

80

90

26.0 28.0

21

35

Known

Oil

Distil t

Oxidized Petrolatum

Emultal

Chloride solution

calcium (180 kg / m)

Offered

Oil Distil t

Oxidized petrol vag residue

Calcium Chloride Solution (180 kg / m)

Compiled by V. Voriskin Editor N. Jazola Tehred O. Niece Corrector D. Zimokosov

Order 451/29 Circulation 644 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5

Branch PSh1 Patent, Uzhgorod, st. Project, 4

table 2

150 130 80

Destruction

Claims (1)

INVERT EMULSION FOR KILLING WELLS, containing oil product, oxidized petrolatum and mineralized water, distinguishing with what, for the purpose; to increase aggregate stability, increase the efficiency of processing the bottom-hole zone of the formation, as well as reduce material costs, it additionally contains the bottom residue of the production of high molecular weight amines C _p -C _go , having the following composition, May. / !: Hydrocarbons 33.4-36.9 Primary amines 23.7-24.9 Secondary amines 39.2-42.9 in the following ratio of ingredients, vol.%: Oil Distillate Mineralized water Oxidized Petrolatum ‘ VAT residue production of high molecular weight amines Cu — Cr ₀ 1.5-3.0 ,,,, 1209604>