Lost circulation material for malignant loss and preparation method

A plugging agent and vicious technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficult to condense and solidify, difficult for plugging materials to stay near the entrance of the leakage layer, and large leakage volume, etc., to achieve durable The effect of strong temperature resistance to salinity, excellent shear thinning performance, and strong anti-washing thinning ability

Inactive Publication Date: 2012-06-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The plugging of malignant leakage is very difficult. The technical difficulties of plugging of malignant leakage include the following two aspects: (1) The plugging agent is easily washed away by water. Generally, there is water (or mud) in formation fractures and caves, and the plugging fluid is generally Water base, when the two come into contact with each other, they will naturally mix, and the plugging agent will inevitably be diluted, which will make the plugging slurry less viscous and easier to flow away, and it will be more difficult for the plugging material to accumulate near the entrance of the leaky layer; After diluting, it is difficult to coagulate and solidify, or the co

Method used

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  • Lost circulation material for malignant loss and preparation method
  • Lost circulation material for malignant loss and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: the preparation method of this leakage stoppage agent:

[0011] First recrystallize acrylamide and sodium dodecylbenzenesulfonate with acetone, and recrystallize hexadecyldimethylallyl ammonium chloride with ethyl acetate; first add the recrystallized After 10 grams of hexadecyldimethylallyl ammonium chloride, 17 grams of acrylamide and 9 grams of sodium styrene sulfate, dissolve completely with 160 grams of fresh water, and adjust the pH value of the system to 6.5 with NaOH solution; Introduce nitrogen into the container for 30 minutes, add 0.2 g of initiator potassium persulfate / sodium bisulfite, continue to ventilate nitrogen for 10 minutes, seal it, place it in an incubator at a constant temperature of 40°C, and react for 24 hours; take it out and cool it to room temperature, and precipitate with acetone , repeatedly washed with acetone solution for 3 times, crushed into fine particles, then soaked in acetone for one day, and dried in vacuum at 40°C to...

Embodiment 2

[0012] Example 2: The degree of flushing of the plugging agent is measured by the sieve method, and the experiment proves that the invention has good anti-flushing ability

[0013] Table 1 Test results of anti-flushing ability of this lost circulation plugging agent

[0014]

[0015] It is measured by diluting degree of the plugging agent at different temperatures and different concentrations. It is found that the plugging agent with a concentration of 1% still has a strong anti-flushing ability at high temperature.

Embodiment 3

[0016] Embodiment 3: The present invention has a good retention capacity and can effectively reside near the entrance of the leakage layer of large cracks;

[0017] The retention capacity is to evaluate the network retention performance of the plugging agent in the formation;

[0018] The measurement method is: pour the prepared plugging agent into a core holder equipped with a simulated large crack (the width of the simulated crack is 3 mm), and place a layer of 10-mesh screen on the lower end of the steel cylinder (to simulate a large leak). Put the core holder into a high-temperature oven, increase the ring pressure to 3MPa, turn on the advection pump, simulate the on-site congestion conditions, displace 10ml (1PV) of clean water, and measure the displacement pump pressure and the filtrate volume at the outlet

[0019] Table 2 The results of the residence ability test

[0020]

[0021] It can be seen from the experimental data that after the lost circulation plugging ag...

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PUM

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Abstract

The invention relates to a lost circulation material for effectively plugging fractured and crushed stratum malignant loss in the drilling process and a preparation method. The invention adopts the technical scheme that a raw material for preparing the lost circulation material comprises the following components: 8 to 12 grams of hexadecyl dimethyl allyl ammonium chloride, 16 to 18 grams of acrylamide, 6 to 12 grams of styrene sodium sulfate, 0.2 to 0.4 gram of sodium dodecyl benzene sulfonate, 0.2 to 0.4 gram of potassium persulfate/sodium bisulfite, 16 to 20 grams of bentonite clay, and 239 to 279 grams of fresh water. The preparation method of the lost circulation material comprises the following steps of: firstly, dissolving recrystallized hexadecyl dimethyl allyl ammonium chloride, acrylamide and styrene sodium sulfate in the water; filling N2, adding an initiator and performing the reaction for 24 hours; precipitating, soaking and drying by using acetone so as to obtain white copolymer; and adding sodium dodecyl benzene sulfonate and bentonite clay into the copolymer and the water to obtain the lost circulation material. The lost circulation material can be used for plugging a leakage zone, has strong crushing resistance and strong temperature resistance and mineralization resistance degree and is suitable to be used for carrying out plugging on a big crack in the drilling process.

Description

technical field [0001] The invention relates to a plugging agent and a preparation method for effectively plugging the malignant leakage of fractured and fragmented formations during the drilling process. Background technique [0002] In recent years, the problem of lost circulation in oil and gas deep well drilling in western my country and northeastern Sichuan has become very prominent. The main characteristics are deep wells, piedmont structures, high and steep structures, containing hydrogen sulfide, and lost circulation is common. In eastern Sichuan, especially in the past 10 years, extensive oil and gas exploration and drilling have been carried out in high and steep structures, remote areas, and high mountain areas. According to statistics in recent years, almost every well drilled has different degrees of lost circulation; among them, general lost circulation accounts for more than 50%, and the success rate of one-time plugging is more than 70%; serious lost circulat...

Claims

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Application Information

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IPC IPC(8): C09K8/42C08F220/56C08F226/02C08F212/14
Inventor 白杨谭晓华刘建仪张广东王平全胡亚琴李丽
Owner SOUTHWEST PETROLEUM UNIV
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