Fracture blocking agent used for drilling fluid and preparation method thereof

A plugging agent and drilling fluid technology, applied in the field of fracture plugging agent for drilling fluid and its preparation, can solve the problems of low plugging strength, short plugging time, easy damage to production layers, etc., and achieve significant economic benefits , Good use effect, significant effect of plugging

Inactive Publication Date: 2017-08-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional plugging materials can form plugging layers in fractures, but there are negative effects such as low plugging strength, short plugging time, easy damage to production layers, and impact on production after production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] A method for preparing a crack plugging agent for drilling fluids, comprising: firstly mixing a surfactant into calcium carbonate, controlling the mixing speed of the surfactant during the mixing process, and mixing uniformly; then mixing sepiolite, acid-soluble fiber and Inorganic salt, stir until evenly mixed.

[0031] When said surfactant is mixed in calcium carbonate, when selecting more than two kinds of surfactants for use, the selected surfactants will be mixed in calcium carbonate respectively and the amount of surfactant mixed in is controlled respectively in the mixing process of each surfactant. speed, and mix well.

[0032] Embodiments of the present invention are as follows:

Embodiment 1

[0034] In this embodiment, the plugging agent for drilling fluid includes the following components:

[0035] 35 parts by weight of meerschaum;

[0036] 20 parts by weight of acid-soluble fiber;

[0037] 36 parts by weight of calcium carbonate;

[0038] 3 parts by weight of sodium chloride;

[0039] Potassium chloride 2 parts by weight;

[0040] SP-80 2 parts by weight;

[0041] Polyethylene glycol 2 parts by weight.

[0042] Its preparation method and steps are as follows:

[0043] Mix SP-80 into calcium carbonate, control the mixing speed of SP-80 during the mixing process, and mix well.

[0044] Mix the polyethylene glycol into the above mixture, control the mixing speed of the polyethylene glycol during the mixing process, and mix evenly.

[0045] The sepiolite, acid-soluble fiber, sodium chloride and potassium chloride are mixed in sequence, and stirred until the mixture is evenly mixed to obtain the fracture plugging agent for drilling fluid.

[0046] This embodim...

Embodiment 2

[0048] In this embodiment, the plugging agent for drilling fluid includes the following components:

[0049] 31 parts by weight of meerschaum;

[0050] 25 parts by weight of acid-soluble fiber;

[0051] 35 parts by weight of calcium carbonate;

[0052] 8 parts by weight of sodium chloride;

[0053] Tween20 1 part by weight.

[0054] Its preparation method and steps are as follows:

[0055] Mix Tween20 into calcium carbonate, control the mixing speed of Tween20 during the mixing process, and mix evenly.

[0056] The sepiolite, acid-soluble fiber and sodium chloride are mixed in sequence, and stirred until the mixture is uniform, and the fracture plugging agent for drilling fluid is obtained.

[0057] The plugging agent in this example is tested indoors using the DL-A high temperature and high pressure plugging simulation experimental device. The plugging agent is added in an amount of 5% in the drilling fluid, and the pressure bearing capacity reaches 11.4MPa at a temperatur...

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Abstract

The invention discloses a fracture blocking agent used for a drilling fluid and a preparation method thereof. The fracture blocking agent is added in the drilling fluid, a stratum fracture can be effectively blocked when well leakage occurs, and well wall stability and oil layer protective effect of a fractured formation are improved. The fracture blocking agent used for the drilling fluid is composed of the following components in parts by weight: 31-35 parts of sepiolite, 20-25 parts of acid soluble fibers, 29-36 parts of calcium carbonate, 5-8 parts of inorganic salt and 1-4 parts of a surfactant, wherein the total parts by weight of the blocking agent is 100 parts. The preparation method comprises the following steps: firstly mixing the surfactant into calcium carbonate, controlling mixing-in speed of the surfactant in a mixing process, uniformly mixing, then sequentially mixing in the sepiolite, acid soluble fibers and inorganic salt, and stirring until the added components are uniformly mixed, so that the fracture blocking agent used for the drilling fluid is obtained. The fracture blocking agent disclosed by the invention has the advantages that materials can be easily selected, cost is low, preparation technology is simple, manufacturing cost is effectively reduced, leaking can be rapidly stopped and leaking stoppage effect is obvious.

Description

technical field [0001] The invention relates to an additive in drilling fluid in petroleum industry, in particular to a crack plugging agent for drilling fluid and a preparation method thereof. Adding the plugging agent in the drilling fluid can effectively plug formation fractures when lost circulation occurs, and improve the wellbore stability and oil layer protection effect of fractured formations. Background technique [0002] Among the various complex situations encountered in drilling operations, lost circulation is one of the most serious problems affecting the safety of drilling operations. If it is not handled properly, it will seriously restrict the benefits of exploration and development. According to statistics, more than half of the world's oil and gas production currently comes from natural fractured oil and gas reservoirs, and fractured oil and gas reservoirs will be one of the main directions for increasing oil and gas reserves and production in the future....

Claims

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Application Information

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IPC IPC(8): C09K8/03
CPCC09K8/03C09K2208/08
Inventor 侯业贵戴荣东田启忠于少卿陈丽媛王锴王健惠伟蒲业
Owner CHINA PETROLEUM & CHEM CORP
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