SU1514757A1 - Method of treating clay-base drilling mud - Google Patents

Description

The invention relates Durenia wells. The goal is to maintain the fluidity of the solution under conditions of high temperature and pressure while simultaneously ensuring low values of the surface tension of the filtrate. The method consists in the introduction of pre-mixed water-repellent silicone fluid (NGL) and rosin-extraction polymer (CEP) into the drilling fluid. The mixture consists of 1 wt.h. NGL and 0.7-2 wt.h. CEP. The last one is Suboy complicated

mixture, the main components of which

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swarms are oxidized polyterpenic hydrocarbons and resin acids Λ mol.m. 256-302. A mixture of NGL and CEP is introduced into the solution in the amount of 12.5 - V

15.0 g per 1 liter of solution. 1 tab.

The invention relates to the drilling of oil and gas wells.

The purpose of the invention is to maintain the fluidity of the solution under conditions of high temperature and pressure while ensuring low values of the surface tension of the filtrate.

The method consists in the introduction of pre-mixed hydrophobic silicone fluid (NGL) and rosin-extraction polymer (CEP) into the drilling fluid. The mixture consists of 1 wt.h. NGL and 0.7-2 wt.h. CEP. It is introduced into the solution in the amount of 12.5-15.0 g per 1 liter of solution.

CEP are a complex mixture, the main components of which are oxidized polyterpene hydrocarbons and resin acids mol.m. 256-302. Preparation of a mixture of NGL and CEP for the treatment of solutions consists in the mechanical mixing of the component prior to introduction (into the drilling mud).

Example 1. In a glass with a capacity of 50 ml, 7.5 g of NGL-10 are weighed, 5 g of the cap are added thereto, the mixture is stirred for 15 minutes on a magnetic stirrer, and then 1 liter of bentonite suspension of 1.13 g / cm ³

1514757 A1

3

'1 5 14757 glass with a capacity

Example 2. In

51) mp is weighed by 5 1 'NGL-10, 10 g of cap is added to the same, the mixture is stirred for 15 min on a magnetic stirrer, and then used for processing 1 liter of bentonite suspension?

The table shows the results of the study of methods of processing mud drilling mud. Solutions are tested under normal conditions and on a UIV-2 device at 150 ° C and a pressure drop of 3 MPa. The fluidity of the solution is estimated by the magnitude of the conditional viscosity.

From the analysis of the data given in the table, it follows that this method (experiments 2 and 4) provides, under conditions of high temperature and pressure, acceptable values of the conditional viscosity of the 20 solution. Processing the solution in a known manner (experiments 1 and 3) leads to its thickening to a non-flowing state. Processing the solution with a mixture of these reagents with extreme values of their ratio does not allow to achieve the goal.

In experiment 6, the ratio of NGL-10: CEP is 2: 1. With this mixture composition, the drilling fluid has an increased surface tension of the filtrate. ·

When the ratio of NGL-10: CEP = 1: 2.3 (experiment 8), the solution has a higher filtration rate.

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Thus, the proposed method allows to obtain drilling solutions at high temperature and pressure! with acceptable technological properties and low values of the surface tension of the filtrate. The specified qualities of solutions predetermine the efficiency of use in the field of new practice.

Claims (1)

Claim The method of treating clay buro15 vogo solution by introducing into it a hydrophobic silicone fluid and a rosin-extraction polymer, characterized in that, in order to preserve the fluidity of the solution under conditions of high temperature and pressure while ensuring low values of surface tension of the filtrate, before introducing into the drilling the solution of hydrophore sizing silicone fluid and the rosin-extraction polymer are premixed in a ratio of 0.7-2.0 wt.h. rosin-extraction polymer to 1 part by weight of 30 hydrophobic silicone fluid, and the mixture is introduced in an amount of 12.5-15.0 g per 1 l of solution. The ratio of re- Input method Total reagent consumption, g on 1 l of solution Mud parameters Studies at 150 * C agents, parts by weight reagents Conditional elm- Water loss, cm ³ Thickness peel, static shear stress, DPA ph The volume of filtrate, cm ⁵ Surface tension, Mime Conditional viscosity, with bone, with mm 1 minute 10 min one NGL-10 cap one 2 Separated 15 Not flowing 7.0 '.five 195 200 9.25 66 52.68 Not flowing 2 NGL-10 one Mixture 12.5 38 8.2 2 129 156 9.52 46.5 · 51.79 40 .3 cap NGL-10 2 1.5 Separated 15 85 7.4 1.2 1 VO 200 9.70 62.0 56,64 Not flowing four cap ckzh-yu one 1.5 Mixture 15 32 7.0 1.2 1.5 14 2 9.82 40.4 52.30 38 five cap NGL-10 one 2 Separated 15 80 7.0 1.5 168 195 10.05 74 59.3 5 Not flowing s cap NGL-10 one 2 Mixture 15 28 6.8 15 , 06 ,thirty 10.25 36.4 59, 5 60 7 cap NGL-10 one one Separated 15 Not flowing 7.4 2.0 "200 > 200 8.68 72.2 50.86 Not flowing eight cap ckzh-yu 2.3 one Mixture 15 58 8.2 2.0 62 , 95 9.04 56,4 50, 14 64 cap 2,3