SU1076434A1 - Method for utilizing waste water-based drilling muds - Google Patents

Description

O) 4 00 4 :: The invention relates to the oil industry, in particular, to methods of utilizing waste water-based drilling fluids and can be used in the construction of wells. . There is a known method of utilization of drilling fluids by thermal dewatering and subsequent disposal. The disadvantage of this method is that it requires the use of special high-performance burners. The closest in technical essence to the present invention is a method of utilization of waste water based mud solutions, which prevents solidification of the drilling fluid by introducing carbamide resin and hardener into it and subsequent disposal of the hardened material in soil G2. A disadvantage of the known method is that the soil surface is disturbed in the burial site of the cured material. The purpose of the invention is to increase the efficiency of the method of disposal by preserving the fertility of the soil at the disposal site of the cured material and imparting to the soil its nutritional agrochemical properties. The goal is achieved by the fact that in the method of disposal of waste drilling fluids on a water basis, including the curing of the drilling fluid by the introduction of urea resin and hardener into it and the subsequent burial of the hardened material in the soil, a double superphosphate is used as a hardener with a 1: 1 ratio of carbamide resin with a total amount of from 5 to 25 wt.% of cured drilling mud. Example 1. In the spent drilling mud (OBR) with a density of 1.88-10 kg / m3, pH 8.35, consisting of a solid phase in an amount of 63% containing,%: ut desicant 44.22; clay 18.18; water 32.7; oil 4.3; and characterized by a chemical oxygen consumption indicator (COD of drilling mud filtrate / equal to 15.51 kg, with constant stirring, urea resin in an amount of 5 wt.% relative masses OBR and then double super phosphate in an amount of 5 wt.% relative to OBR masses. After 2 days of hardening, the erosion strength value reaches 0.43 MPa, oil products after holding the cured sample in water for 2, 7 and 14 days are absent; .COD extractable water after 7 days 1.42 kg Oz, / m3. Example 2. In the spent drilling mud op (OVR) with a density of 1.07–10 kg / m and a pH of 9.3, consisting of a solid phase in the amount of 11.32 wt.%, containing,%: clay 11.25, ut desired 0.07 / water 8 , 37; oil 10,31, as well as characterized by chemical oxygen consumption (COD) of the filtrate of this solution, equal to 3.95 kg, with constant stirring, urea resin is introduced in an amount of 20 wt.% Relative to the mass of the switch-over material, and then double the amount of 20 wt.% relative to the mass OBR. After 17 days of hardening, the compressive strength reaches a value of 0.56 MPa, oil products after holding the cured sample in water for 2 days are absent; COD extraction water after 2 days 2.1 kg. Example 3. In the spent drilling mud (OBR) with a density of 1.88-103 kg / m3, pH 8.35, consisting of a solid phase in an amount of 63 wt.% Containing,%; ut jelly 44,22; clay 18.18, - water 32.7, oil 4.3, and also characterized by the chemical consumption of oxygen by the filtrate OBR equal to 15.51 kg 02 / m, with constant stirring, urea resin in an amount of 25 wt.% relative mass OBR, and then double superphosphate in the amount of 25 wt.% relative to the mass OBR. After 17 days of hardening, the compressive strength index reaches 0.51 MPa; oil products after the cured sample is kept in water for 2.7 and 14 days are absent, - COD of extraction water after 7 days has an indicator of 2.08 kg O2 / m. Example 4. In the spent drilling fluid containing,%: water 43,34, solid phase - 44,12 (of which ut preferred 6.31, clay 37.81), oil and oil products 12.53, density 1.36 - Yu kg / m3, pH 8.55, COD of the filtrate 20.59 kg / mg; with constant stirring, carbamide resin and double superphosphate are introduced in an amount in the range of 5-25 wt.%. After 2 days, the cured material is characterized by an indicator of compressive strength, much higher than the value of 0.1 MPa, necessary for the development of the bearing capacity of the soil. In tab. Figure 1 shows the results of testing samples of cured material of various periods of hardening and storage in water.

Table 1

From the data of Table 1 it follows that the aqueous medium has practically no effect on the strength properties of the solidified masses, regardless of the curing period and the time of exposure to the aqueous medium.

The proposed method of disposal of waste drilling muds.

The content of oil and petroleum products (NP), kg / m3

bakes the neutralization and neutralization of the main contaminant components contained in the OBR by binding them in the structure of the curable mass, as evidenced by the test results given in

tab. 2,

table 2

Content of DOUBLE superphosphate (, DPF j in terms of the active element (PO | - 1 kg / m

Ye data in the table. 2 that even with the minimum amount of curing composition injected, the most toxic and contaminating compound for the natural environment — oil — is not detected in extraction solution. At the same time, PO | ions appear in a significant amount in the extractant, which indicates that the double superphosphate used, which serves as a hardener, gives even more nutritional qualities to the cured

Continued table. 2 1.38 1.43 1.79

to the masses. In practice, the ingestion of double superphosphate as a nutrient into the soil will be achieved by leaching it from

hardened material soil moisture.

The results of the tests suggest that the use of this method will improve the quality of disposal of waste drilling muds and ensure the preservation of the natural environment. 2.78 4.0 8.13 12.31 3.10 5.08 9.13 18.00 4.05 6.63 10.74 23.00

Claims (1)

(57) METHOD FOR DISPOSAL OF WASTE DRILLED DRILLING SOLUTIONS ON A WATER BASIS, including curing the drilling fluid by introducing urea resin and hardener into it and subsequent burial of the cured material, characterized in that, in order to increase the efficiency of the disposal method by preserving the fertility of the soil in the burial material and giving the latter nutritional agrochemical properties, double superphosphate, taken in the ratio with urea resin 1: 1 with a total the amount of 5-25 wt.% relative to the weight of the cured drilling fluid.