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A technology of plugging agent and activator, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of easy channeling, contamination of drilling fluid, poor adhesion, etc. , high-strength effect
Inactive Publication Date: 2016-02-24
BC P INC CHINA NAT PETROLEUM CORP +1
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[0006] The purpose of the present invention is to provide a curable pressure-bearing plugging agent for oil field drilling. The plugging agent has a simple preparation process, has the characteristics of low-temperature cementation and high-temperature curing, is easy to reside in the leakage channel, and has high curing strength, which can improve The pressure bearing capacity of the fractured formation can effectively seal the leaky layer, and overcome the shortcomings of conventional plugging agents such as difficulty in staying, easy to channel and mix, poor cohesiveness, and polluted drilling fluid
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Embodiment 1
[0023] Pressure-bearing plugging agent formula: 22mL of sodium silicate solution with a concentration of 36% and a modulus of 3.3, 5.73g of sodium hydroxide dry powder, 18mL of clear water, 50g of metakaolin, 0.01g of modified polypropylene fiber, and 1g of 80-100 mesh mica flakes , 100~200 mesh walnut shell 2g, 800 mesh calcium carbonate 5g, curing temperature 60°C.
[0024] Specific preparation process:
[0025] (1) Mix sodium silicate solution, sodium hydroxide and water, stir for 30 minutes, and prepare a sodium silicate solution with a concentration of 20% and a modulus of 1.0;
[0026] (2) Weigh metakaolin, mix it into the above solution, and stir for 20 minutes;
[0027] (3) Add the filling material while stirring. There is no special regulation for the order of addition. After all the addition is completed, stir for 10 minutes;
[0028] (4) Put it in a constant temperature and humidity box for curing, monitor the initial and final setting time of the slurry, and meas...
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Abstract
The invention discloses a pressure bearing and leakage blocking agent, which solves the problems of difficult retention, easy mixing, poor caking property and pollution of a drilling fluid of the routine leakage blocking agents. The pressure bearing and leakage blocking agent comprises the following components: an amorphous form aluminosilicate curing agent, an activator, a retarder and an inertia filling material; a ratio of components is calculated according to a following mode: modulus is 1.0-1.4, the activator with mass concentration being 10-20% is taken as a liquid phase, a mass ratio (water cement ratio) of the liquid phase to the curing agent is 0.8-1.2; the addition of the retarder accounts for 0-1% of total amount of the above slurry. The pressure bearing and leakage blocking agent has the advantages of adjustable solidification time, high solidification intensity, large bearing, is not restricted by a leakage channel, so that effective plugging is formed to a leakage layer.
Description
technical field [0001] The invention relates to a plugging agent for petroleum drilling, in particular to a solidified pressure-bearing plugging agent. Background technique [0002] The leakage problem of drilling working fluid is more common in the drilling process, especially with the continuous deepening of oilfield exploration and development, the malignant leakage problems such as deep fractures and karst caves need to be solved urgently. Leakage agents and slag-based plugging agents have problems such as poor environmental adaptability and high temperature failure. [0003] During the application of the composite plugging agent, it is necessary to accurately predict the shape and size of the leaking layer in order to optimize the particle size of the plugging agent. However, during the construction process, it is difficult for technicians to judge the real situation downhole. The success rate is greatly reduced. [0004] Cement plugging has the advantages of fast spe...
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