SU1058994A1 - Non-clay drilling mud for injecting into wells - Google Patents

Abstract

GRAIN FREE DRILLING SOLUTION FOR FINISHING WELLS, containing potassium-containing titanium and magnesium production waste, caustic soda, condensed sulphite-alcohol bard, carboxymethylcellulose, flotation reagent and water, as well as the same body, heart, heart, heart, heart, heart, heart, body volume, heart volume, reagent grade, caustic soda at the stage of calling the inflow of formation fluid, it additionally contains orthophosphoric acid and soda ash, and as a flotation reagent - T-80 flotation reagent with the following ratio of ingredients, wt.%: Potassium waste titanium-magnesium 18.35-21,24 production 0.18-0.21 Caustic soda Condensed sulfite-alcohol 2.45-2.83 bard Carboxymethylcell (O 0.24-0.28 lulose OD2-OD4 Flotoreagent T- 80 Orthophosphoric acid 1,02-3,06 Calcined 1,41-3,06 soda Remaining Water: l X: about 4; ib

Description

The invention relates to the drilling of wells, in particular to non-clay drilling muds, intended for the completion of oil and gas wells in fields, the cuts of which are composed mainly of strong, dense rocks with small layers of clay, argillite and siltstone.)

A well-known distribution of oil flow during well drilling, containing process water, hydrochloric acid and chalky pulp. When these components are mixed, a large amount of coal-j acid gas (foam) is formed, capable of creating a depression in the oil reservoir and causing an influx of reservoir fluid. Yes 1 .

However, this solution has low foaming properties. The resulting foam is characterized by a short lifetime and, as a result, cannot create a deep depression in the reservoir and thereby cause an influx of oil in one go, therefore the treatment with this solution has to be repeated several times.

The closest technical solution to the invention is a clay-free well completion drilling mud containing potassium-containing titanium-magnesium production waste, caustic soda, condensed sulphite-alcohol bard, Kap6o-ipsyl cellulose, flotation reagent and water. The known clayless drilling solution for well completion contains the following substances, wt%:

Potassium containing waste 1

titanium magnesium

production 6,12-23,73

Caustic soda 0.17-0.23

Condensed

sulfite alcohol

bard (KSSB-2) 1,45-3,16

Carboxymethylcellulose (KShch-600) 0,17-0,39

Flotation agent (T-66) 0,26-0,39

WaterEverything

Known drilling mud may also contain up to 0.14 wt.% Polyacrylamide. The following operations are performed on a known clayless drilling mud — when completing the well: opening the reservoir with drilling; cnycki casing in well flushing; casing cementing; well perforation. Moreover, all of these operations are performed on this drilling mud without a single, even partial replacement of it from the wellbore 2

However, the known non-gelling mud of the indicated composition cannot be used to call for the inflow of formation fluid (the last operation at completion of the well).

as it has no foaming properties, i, e. This solution is not able to create a depression on the reservoir and thereby cause an influx of formation fluid. 5 The purpose of the invention is to impart foaming properties to a non-clay drilling mud for well completion at the stage of call for the flow of formation fluid. .

0 The goal is achieved by the fact that a clay-free drilling completion drilling fluid containing potassium-containing titanium-magnesium production is caustic

e soda, condensed sulphite-alcohol bard, carboxymethyl cellulose, flotation reagent and water, additionally contains orthophosphoric acid and soda ash, and as a flotation reagent - flotation reagent T-80

0 at the right: to what the ratio of ingredients, wt.%:

Potassium-containing titanium-magnesium waste

5 production 3.35-21.24 Caustic soda 0.18-0.21 Condensed sulphite-alcohol

bard 2.45-2.83

0 Carboxymethylcellulose0, 24-0.28

Flotation reagent T-80 0.12-0.14 orthophosphorus

acid1.02-3.06

Soda Ash 1,41-3,06

WaterEverything

The appearance of high foaming properties of the proposed solution seems to be due to the peculiarities of the synergistic stabilization

products of the interaction of orthophosphoric acid and soda ash in the presence of other ingredients of the drilling fluid at the specified ratio

PRI me R. During laboratory tests, the limiting and optimal concentrations of the components and the properties of the resulting foam are determined. In carrying out the above tests, a clay-free BUROW solution of the following chemical sc1 is used; ava, wt.%:

Potassium-containing titanium-magnesium waste

production (potassium chloride electrolyte) 23,73 Caustic soda 0,23 Condensed sul0 fit-alcohol bard

(KSSB-2) 3.16

Carboxymethylcellulose (CMC-600) 0.31

Flotation reagent T-80 0.26 5 WaterErestal This non-clayey bourbwaise solution is characterized by the following physicochemical indicators:. Density, kg / m x 10 1.17 Conventional viscosity (), с5 Filtration index by VM-6 for 30 min, PH7.0 The specified non-clay drilling mud is prepared as follows. First, a saturated (30%) aqueous solution of potassium-containing waste (potassium chloride electrolyte HKE) is prepared. Then it is treated with a 40% aqueous solution of caustic soda in an amount of 0.3 ness.% (Calculated on dry product). The resulting mixture was stirred for 15 minutes and then stabilized by injecting KBSB-2 in the form of a 25% aqueous solution in an amount of 4.0% by weight (on a dry product) and CMC-BOO in an amount of 0.4 weight. % (on dry product) in the form of a 5% aqueous solution. For the purpose of defoaming, the solution is treated with flotation reagent in an amount of 0.28% by weight. After a little mixing, the solution is ready. Use also a solution of orthophos 4 ornogo acid () 77,4% concentration density of 1.6 g / cm mark B 2nd grade, GOST 10678-76} soda ash () 20% concentration - a white solid crystalline substance 1st grade, GOST 5100-73. Tests to determine the performance of foam properties are as follows. 100 ml of the specified non-clay drilling mud is poured into a 1000 ml measuring cylinder and orthophosphoric acid is added to it, and then a solution of soda ash. When two last substances are mixed with each other, the reaction occurs: 2H, jPO4 + Na2CO. + HjO + CO Due to the formation of carbon dioxide, as well as the presence of surface-active substances (CMC and CSSC) in a clay-free drilling mud, the latter is turned into foam. In each experiment using the well-known method, the following parameters of the foam properties are determined: the multiplicity, density and time of release of 50% of the foaming liquid. Data on properties with different ratios of ingredients are given in Table. one.

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about um From tab. 1 shows that clay-free drilling mud with the content of ingredients in it, wt.%: Potassium-containing waste of titanium-magnesium 18.35-21,24 Production 0.18-0.21 Caustic soda Condensed sulfite-alcohol bard {KSSB-2) 2 , 45-2.83 Carboxylmethylcellulose (CMC-600) 0.24-0.28 Flotation agent (T-80) 0.12-0.14 Orthophosphoric 1.02-3.06 Acid 1.41-3.06 Calcined soda § The rest. at the stage of calling for the inflow of formation fluid, it has high foaming conditions. Preposition Chlorkalium-electrolyte - waste of titanium-magnesium production 20,52 Caustic soda Condensed sulfite-alcohol bard. Carboxymethylcellulose Flotation Reagent Orthophosphoric Acid Calcined 2.05 soda Remaining Water Notified l Saline acid (23% conc.) 52.17 Chalk pulp (technical water + calcium carbonate) (p 1370 kg / m3) 47.83 Known 2 Chlorine - electrolyte - waste of titanium-magnesium production 20.52 CaVtic soda 0.21 Condensed sulfite-alcohol bard2.74 Carboxymethylcellulose0,27 Flotation reagent 0.14 Hydrochloric acid (23%) 1.02 Chalk (CaCO2) 2.05 Water Remaining properties: the foam formed when all the ingredients are mixed is characterized by high cr activity (5-10) and long release of 50% foaming liquid (28-180 min). Under laboratory conditions, comparative tests are carried out to determine the foaming properties of the foam properties of the proposed non-clay drilling mud, known Cl} drilling mud (by adding hydrochloric acid and chalky slurry to ordinary water-free mud) and drilling mud obtained by mixing the known 2j clayless mud, hydrochloric acid and chalk. The data obtained are given in Rabl. 2. T a b e c i a 2

The data table. 1 and 2 show that the foam obtained at the stage of calling the inflow of formation fluid from the new non-clay drilling mud is characterized by high multiplicity (5-10) and high stability (28-180 min), while the known foam l obtained from technical water, hydrochloric acid and chalky pulp, does not possess such properties at all, despite the fact that hydrochloric acid and pulp are introduced into. significantly larger quantities than orthophosphoric acid and calcium soda in the proposed drilling mud.

In addition, the foaming properties of a known 2j clayless drilling mud, obtained by mixing a known drilling fluid with hydrochloric acid and chalk, are also very small: the foam multiplicity is only 3.5, and the foam lifetime is only 8 minutes.

Due to the high conversion properties of the proposed clayless drilling mud, under production conditions, the inflow of formation fluid will be guaranteed to be called during one treatment, while known foams require processing several times and additional aeration using a compressor to cause the formation fluid to flow.

During the course of laboratory tests, “the possibility of translating the vsnennogo proposed without clay

drilling mud (foam) back into the drilling fluid. To do this, you need to use the following reagents, flotation reagent (T-80), caustic soda, condensed sulfite-alcohol GapKy (КССБ-2) and carboxymethylcellulose (CMC-VOO).

The characteristics of these reagents: Flotation T-80 - light brown, easily mobile, oily liquid, TU 38-10-3429-80 ..

Caustic soda (VaOH) is a whitish solid crystalline mixture TU 6-18-45-74.

Conded sulfite-alcohol bard (KSeB-2) - brown powder "TU 39-095-75.

Carboxymethylcellulose (CMC-600} white or slightly creamy fiber-like substance, GOST 5588-70. Data on the properties of the recovered from the pgna beregliistoy drilling mud, as well as the consumption of reagents that can turn this foam back into the drilling fluid, are given in tabl .. 3.

Table. 3 show that the foam, which, when introduced into the well-known non-earthen drilling mud of orthophosphoric acid and calcium soda, can be turned back into the drilling fluid, if into this foam, based on 1 weight by weight, foamed non-clay mud, 0.00017 -0,00051 weight.h. flotation reagent T-80; 0.0017-0.0051 weight.h. caustic soda; 0.0085-0.0427 weight.h. condensed sulfite-alcohol bards KSSB-2 and 0,000840, 0043 weight.h. carboxymethylcellulose CMC-Bor.

During laboratory tests, the possibility of multiple use of the solution reversed from the foam for subsequent drilling was revealed. For this, orthophosphoric acid and soda ash are added to a known non-clay drilling mud and foam is obtained with certain properties. And when receiving foam to 1 weight.h. a known 2j non-clay drilling mud is added or 0.021 in..h. orthophosphoric

acids and 0,020 weight.h. soda ash, which, in terms of weight percent, corresponds to a content in the proposed solution of 1.02 wt.%) and 2.05 wt.%

(table. 1, experience 13) or 0,043 weight.h. and 0.043 jec.ch. that in terms of weight percent corresponds to the content in the new drilling mud 3.06 wt.% H.jPO4 and 3.06

wt.% NajiCO (table. 1, experiment 17)

Then this foam is again converted into a solution suitable for subsequent drilling using T-80 flotation reagent, caustic soda, KSSB-2 and CMC-600.

Then, this solution is again transformed into a foam, which is again converted into a solution, and this transformation is carried out three times, and in each experiment, indicators of the properties of the foam and the mud obtained from the foam are determined.

Data on the properties of the foam and drilling mud during their transformation into each other are given in Table. four.

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l (The result, shown in Table 4, shows that the price of an outdated scraper after a call for inflow of sludge fluids can be repeatedly converted into the drilling fluid and vice versa, and the indicators of the properties of both the foam and the drilling fluid meet the requirements 6 ypoai # {worked to preserve its original quality, despite the fact that the drilling mud was converted into foam and vice versa. During laboratory tests it was found that it was, oh, as a result of hydrochloric acid injection into the known 2 clay-free Burrva solution can not Translated back into the drilling fluid, as hydrochloric acid, will give rise to a significant deterioration in the properties of a mud-free drilling fluid. Under field conditions, the foam produced with hydrochloric acid is thrown onto the surface and severely pollutes the environment. Without a clay drilling well completion system, at present, it hasn’t been used / because it doesn’t have an ooo & In the domestic practice of drilling of wells, a solution has been widely used for inducing inflow of a reservoir fluid at the end of a squash based on MPE, aerated by air (base object). When aerating the solution, a foam is obtained which creates a depression on the formation, which contributes to the induction of the influx of formation fluid. The technical and economic advantage of the proposed drilling fluid completion solution compared with the base object is that the foaming properties at the call flow stage of the proposed solution are much higher than the foaming properties of the known solution, namely: the multiplicity, the foam is higher than 2 times, and the lifetime is 4-5 times longer. Due to this advantage, the proposed drilling fluid allows one to carry out the call for oil flow in one treatment, while using a known mud, several treatments should be carried out (from 3 to 5 or more Treatments) in order to achieve a positive result. This will reduce material and labor costs by 40%. In addition, the proposed drilling fluid, after calling the inflow of formation fluid, can be reused for subsequent drilling by adding flotation reagent (T-80), caustic soda (NaOH), KCSB-2 and CMC-600, while C from the Known Mortar, is ejected from the well directly onto the surface of the ground, contaminating the surrounding area and interfering with the work of the crew. The proposed non-clay drilling mud, at the stage of calling for the inflow of the platinum fluid, is in the form of foam, all of which is again converted into drilling mud, suitable for subsequent drilling. This prevents contamination of the terrain and at the same time reduces material costs due to reuse for drilling the same material.

Claims (1)

A CLAY-FREE DRILLING DRILL FOR COMPLETING WELLS containing potassium-containing waste of titanium-magnesium production, caustic soda, condensed sulphite-distillery stillage, carboxymethyl cellulose, flotation agent and water, characterized in that, in order to impart properties to the formation, the foam is injected with a foam additionally contains phosphoric acid and soda ash, and as a flotoreagent - flotation reagent T-80 in the following ratio of ingredients, wt.%: Potassium-containing waste of titanium-magnesium production Caustic soda Condensed sulphite-alcohol barda Carboxymethyl cellulose Flotoreagent T-80 Phosphoric acid Calcined soda Water 18.35-21.24 0.18-0.21 g