Filtercake removal using exothermic in-situ nitrogen-producing reactants
a technology of reactants and filtercakes, which is applied in the direction of fluid removal, chemistry apparatus and processes, and well accessories, etc., can solve the problems of pipe sticking, other drilling problems, and compromise of reservoir productivity, so as to reduce the viscosity of oil, reduce the hydrostatic pressure of the oil column, and enhance the mobility
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example 1
[0041]In order to assess the efficacy of the method of the present invention on a laboratory scale, a High Pressure (HP) / High Temperature (HT) Fluid Loss Test was conducted. The conditions and results are set forth below:
High Pressure / High Temperature Fluid Loss Test
[0042]A standard HP / HT filter press was used to perform tests under static conditions. Several HP / HT fluid loss tests were conducted to build-up the filter cake under static conditions using lab mud samples. The generated filtercake was then treated in accordance with the process of the present invention, Nitrogen / Heat Generation System (N / HGS), along with other additives. The test procedure employed is described below:[0043]1. Saturate the (10 μm) disc in (44 g of NaCl+336.7 ml H2O) NaCl completion brine.
[0044]2. Load the disc in the fluid loss cell.
[0045]3. Fill the cell with 350 ml filtered brine solution.[0046]4. Place the cell in heating jacket and allow 20 minutes to reach 160° F. (71° C.).
[0047]5. Pressurize the c...
example 2
Thermodynamics Determination of N / HGS:
[0064]The test procedure used to determine N / HGS thermodynamic was as follows:[0065]1. Place 64 ml (30 ml of NaNO2 and 30 ml of NH4Cl) in a 1000 ml beaker.[0066]2. Add 36 ml SGN Reagent B to the beaker.[0067]3. Stir gently using a magnetic stirrer for one (1) minute[0068]4. Record temperature[0069]5. Add 0.5 ml of acetic acid to the beaker to start the reaction[0070]6. Record the temperature at 30 second intervals until reaction is completed[0071]7. Repeat experiment to eliminate errors.
[0072]The same testing procedure that was used in Example 1 with the HP / HT filter press was used to generate the temperature and pressure profiles shown in FIGS. 4 and 5. The results obtained show that significant heat generation and nitrogen production which was observed as pressure increased is associated with the exothermic reaction of the N / HGS components.
example 3
[0073]This example is representative of the process of the present invention.
[0074]Employing the apparatus depicted in FIG. 1, Pill A, whose composition is set forth in Table 1 below, is injected into the coiled tubing and Pill B, whose composition is identified in Table 1 below, is injected into the production tubing. Pill A is injected at twice the rate of Pill B. The term “pill” as used here means batch or mixture.
TABLE 1General formulation of N / HGSComponentCompositionConcentrationPill ANaNO2 + 15 vol % Acetic Acid66.67 vol %Pill BNH4Cl33.33 vol %
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