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Plugging agent and preparation method thereof

A technology of plugging agent and proppant, applied in the field of drilling, can solve the problems of blockage, inability to produce oil and gas, oil and gas production reduction, etc., and achieve the effect of good plugging effect, easy solidification, and high pressure bearing capacity.

Active Publication Date: 2017-07-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a plugging agent and a preparation method thereof to solve the problem that the current bridging type plugging agent will cause permanent damage to the lost section of the oil reservoir, thereby reducing the production of oil and gas, or even completely blocking the pores of oil and gas, resulting in the inability to recover oil and gas. question

Method used

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  • Plugging agent and preparation method thereof

Examples

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preparation example Construction

[0030] Based on the lost circulation agent provided in the embodiment of the present invention, the present invention also provides a preparation method of the lost circulation agent. Please refer to the attached figure 1 , the preparation method comprises the following steps:

[0031] S101. Take 5-45 parts by mass of the porous substance, place it in a stirrer, and start stirring.

[0032] S102. Take 5-35 parts by mass of the proppant and put it in the mixer.

[0033] S103. Take 10-25 parts by mass of the coagulant and place it in a stirrer.

[0034] S104. Take 5-30 parts by mass of the special fiber and place it in a blender until the mixture is evenly stirred.

[0035] For the beneficial effects of the leak-stopping agent obtained through the preparation method provided in the embodiment of the present invention, please refer to the description of the corresponding part above, and details will not be repeated here. It should be noted that steps S101-S104 can be performe...

Embodiment 1

[0037] Please refer to the attached figure 2 , figure 2 It is a schematic flow chart of the preparation method of the lost circulation agent provided in Example 1 of the present invention. figure 2 The process shown includes:

[0038] S201. Put 10 parts by mass of shell powder and 20 parts by mass of slag powder into the mixer, and start stirring.

[0039] S202. Put 15 parts by mass of limestone powder into the mixer.

[0040] S203. Put 10 parts by mass of potassium persulfate into the mixer.

[0041] S204. Take 5 parts by mass of acrylic fibers and put them into the agitator, and the agitator stops working after stirring the above mixture evenly.

[0042] The plugging agent prepared in Example 1 of the present invention includes: 10 parts by mass of shell powder, 20 parts by mass of slag powder, 15 parts by mass of limestone powder, 10 parts by mass of potassium persulfate, and 5 parts by mass of acrylic fiber.

Embodiment 2

[0044] Please refer to the attached image 3 , image 3 It is a schematic flow chart of the method for preparing the lost circulation agent provided in Example 2 of the present invention. image 3 The process shown includes:

[0045] S301. Put 10 parts by mass of diatomite and 25 parts by mass of slag powder into the mixer, and start stirring.

[0046] S302. Take 10 parts by mass of kaolin and put it into the mixer.

[0047] S303. Put 10 parts by mass of potassium persulfate into the mixer.

[0048] S304. Take 5 parts by mass of plant fibers and put them into the agitator, and the agitator works until the mixture is uniform.

[0049] The lost circulation agent obtained by the preparation method provided in Example 2 of the present invention includes: 10 parts by mass of diatomite, 25 parts by mass of slag powder, 10 parts by mass of kaolin, 10 parts by mass of potassium persulfate, and 5 parts by mass of plant fiber .

[0050] The performance index of the leakage plugging ...

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Abstract

The invention relates to the technical field of well drilling, and discloses a plugging agent and a preparation method thereof. The plugging agent comprises, by mass, 5-45 parts of a porous substance, 5-35 parts of a proppant, 10-25 parts of a coagulant, and 5-30 parts of special fiber. The plugging agent provided by the invention does not cause permanent damage to a leakage loss section of an oil reservoir. When filter cake formed by the plugging agent is dissolved by using acid, oil and gas pores can be reopened, such that a problem of oil and gas production reduction can be avoided, and further a problem of oil and gas recovery failure caused by completely blocked oil and gas pores can be avoided. Also, under the effect of geotemperature, the filter cake formed by the plugging agent provided by the invention can be gradually solidified. As a result of tests, compared with a bridging type plugging agent, the plugging agent provided by the invention has the advantages of faster solidification, higher pressure bearing capacity, and thus better plugging effect.

Description

technical field [0001] The invention relates to the technical field of drilling, more specifically, to a lost circulation agent, and also relates to a preparation method of the lost circulation agent. Background technique [0002] Lost circulation is a common problem in the drilling process, which is extremely harmful to drilling operations. In order to block the leaking layer, the plugging agent forms a barrier in the leaking channel that is closer to the wellbore, and is used to block the leaking channel. At present, the more common plugging agents are bridging plugging agents, such as mica, sawdust, rice husk, vermiculite, rubber powder, etc. In the process of plugging, particles of different particle sizes are gradually blocked in oil-gas gaps of different widths to achieve the purpose of plugging. However, most of the plugging agents are not acid-soluble, not oil-soluble, and will not degrade. Obviously, this lost circulation agent will cause permanent damage to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42
CPCC09K8/426C09K2208/04C09K2208/08
Inventor 彭春耀郑斌华桂友张振华曹晓晖关忠良
Owner BC P INC CHINA NAT PETROLEUM CORP
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