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Plugging agent and preparation method and application thereof

A plugging agent and enhancer technology, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of unsatisfactory plugging effect, unstable bridging structure, plugging and pressure bearing for many times Poor capacity and other problems, to achieve the effect of controllable thickening time, good salt resistance, and safe construction

Inactive Publication Date: 2020-07-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Among these plugging agents, the fiber material is paper scrap fiber or asbestos fiber, polypropylene fiber, fruit shell, rubber and other bridging materials. Since there is no good material to enrich and compact after bridging, this bridging structure is extremely unstable. , will disintegrate with formation pressure fluctuations, resulting in unsatisfactory plugging effects and poor plugging pressure bearing capacity

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  • Plugging agent and preparation method and application thereof
  • Plugging agent and preparation method and application thereof
  • Plugging agent and preparation method and application thereof

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preparation example Construction

[0055] The present invention also provides a method for preparing any of the above described leakage stoppage agents, comprising the following steps:

[0056] 1) After mixing the phosphate cement and the reinforcing agent, adding water, stirring evenly to obtain an intermediate solution;

[0057] 2) Add the admixture to the intermediate solution and stir evenly to obtain the plugging agent.

[0058] The selection and consumption of all raw materials in the preparation method are the same as those described in the above-mentioned plugging agent.

[0059] In step 1), the phosphate cement is calcined at 1450° C. from polyphosphate, limestone and magnesium oxide.

[0060] The reinforcing agent is prepared by uniformly mixing 10-20 parts of fiber, 20-25 parts of rubber powder, 30-35 parts of aluminum oxide, 15-25 parts of phosphogypsum powder and 15-25 parts of micro silicon.

[0061] In step 2), the selection of the type and dosage of the admixture is related to the target densi...

Embodiment 1

[0067] The lost circulation agent of the present embodiment comprises following components:

[0068] 65 parts of phosphate cement;

[0069] 35 boosters;

[0070] 2 parts fluid loss reducer;

[0071] 1 part retarder;

[0072] 0.5 parts of defoamer;

[0073] 79 parts water.

[0074] Among them, phosphate cement is calcined at 1450°C by polyphosphate, limestone and magnesium oxide.

[0075] Each booster contains the following ingredients:

[0076] 3 parts polypropylene fiber (2-5mm);

[0077] 7 parts brucite fiber (1-2mm);

[0078] 3 parts coir (2-5mm);

[0079] 22 parts of rubber powder (8-10 mesh);

[0080] 30 parts of aluminum oxide (2500 mesh);

[0081] 15 parts of phosphogypsum powder (1000-1200 mesh);

[0082] 20 parts micro silicon (2000 mesh).

[0083] The leak-stopping agent of the present embodiment is prepared according to the following method:

[0084] 1. After mixing phosphate cement and reinforcing agent, add water and stir evenly to obtain an intermedi...

Embodiment 2

[0088] The lost circulation agent of the present embodiment comprises following components:

[0089] 70 parts of phosphate cement;

[0090] 30 boosters;

[0091] 1 part drag reducer;

[0092] 0.5 parts of defoamer;

[0093] 66.6 parts barite;

[0094] 55 parts water.

[0095] Among them, phosphate cement is calcined at 1450°C by polyphosphate, limestone and magnesium oxide.

[0096] Each booster contains the following ingredients:

[0097] 3 parts polypropylene fiber (2-5mm);

[0098] 7 parts brucite fiber (1-2mm);

[0099] 3 parts coir (2-5mm);

[0100] 22 parts of rubber powder (8-10 mesh);

[0101] 30 parts of aluminum oxide (2500 mesh);

[0102] 15 parts of phosphogypsum powder (1000-1200 mesh);

[0103] 20 parts micro silicon (2000 mesh).

[0104] The leak-stopping agent of the present embodiment is prepared according to the following method:

[0105] 1. After mixing phosphate cement and reinforcing agent, add water and stir evenly to obtain an intermediate s...

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Abstract

The invention provides a plugging agent and a preparation method and application thereof. The plugging agent comprises the following components in parts by mass: 65-75 parts of phosphate cement, 25-35parts of a reinforcing agent, 1.5-10 parts of an additive and 50-80 parts of water, wherein the phosphate cement is formed by calcining polyphosphate, limestone and magnesium oxide at 1450 DEG C; thereinforcing agent is prepared from the following components in parts by mass: 10 to 20 parts of fiber, 20 to 25 parts of rubber powder, 30 to 35 parts of aluminum oxide, 15 to 25 parts of phosphogypsum powder and 15 to 25 parts of micro-silicon. The plugging agent can quickly form an interpenetrating network structure, is effectively retained in a plugging layer, forms an effective solidified body with high compressive strength, slight expansion and long period at the plugging layer position, and particularly has good plugging capacity for an overflow and leakage coexisting stratum of a high-pressure salt water layer of a salt paste layer.

Description

technical field [0001] The invention relates to a plugging agent, a preparation method and application thereof, and belongs to the technical field of petroleum exploitation. Background technique [0002] Lost circulation and well overflow are the most common complex phenomena in the process of petroleum exploration and development, especially when drilling into high-pressure saline formations in salt-gypsum formations. Among them, if the high-density drilling hydraulic pressure leaks out of the weak formation in the open-hole section, the high-pressure brine layer in the salt-gypsum layer is on the upper part of the lost zone, which may cause the phenomenon of "overflow and lower leakage"; when the high-pressure brine layer in the salt-gypsum layer is under the lost zone, It may cause the phenomenon of "upper leakage and lower overflow", so it is very easy to form an extremely complicated phenomenon of coexistence of overflow and leakage during the drilling process. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/467E21B33/13
CPCC09K8/426C09K8/467E21B33/13
Inventor 朱金智张震尹达周志世张绍俊晏智航任玲玲陆海瑛罗威吴晓花
Owner PETROCHINA CO LTD