Pressure response type consolidation plugging agent as well as preparation method and application thereof

A kind of lost circulation agent and pressure technology, applied in the field of lost circulation agent, can solve the problems of insufficient adaptability of fractured leakage layers, low pressure bearing capacity, low leakage blocking success rate, etc., to achieve rapid response to environmental pressure changes, reduce drilling Cost, effect of safe and fast drilling

Active Publication Date: 2022-06-03
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

[0005] To sum up, most of the existing plugging materials have insufficient adaptability to fractured leakage layers, low pressure bearing capacity, low plugging success rate, and poor reproducibility in field use.

Method used

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  • Pressure response type consolidation plugging agent as well as preparation method and application thereof
  • Pressure response type consolidation plugging agent as well as preparation method and application thereof
  • Pressure response type consolidation plugging agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The present embodiment provides a leakage blocking agent, and the preparation method of the leakage blocking agent is as follows:

[0044] 1. Add 130g / L of anhydrous calcium sulfoaluminate to the calcium sulfate aqueous solution with a mass concentration of 3% and then add 30ml / L of 99.5% absolute ethanol, react in a constant temperature water bath at 60°C for 30 minutes to obtain pretreatment Anhydrous calcium sulfoaluminate;

[0045] 2. Preprocess the dicalcium silicate according to the method and parameters of step 1 to obtain pretreated dicalcium silicate;

[0046] 3. In parts by weight, combine 15 parts of pretreated anhydrous calcium sulfoaluminate (200 mesh), 15 parts of pretreated dicalcium silicate, 30 parts of diatomaceous earth, 30 parts of ceramic fibers, 4 parts of polymer Acrylamide, 1 part of polyvinyl butyral, and 3 parts of sodium pyrophosphate are mixed in a mixer, then add water and stir evenly, then add 0.1 part of ferric chloride, and stir and reac...

Embodiment 2

[0048] The present embodiment provides a leakage blocking agent, and the preparation method of the leakage blocking agent is as follows:

[0049] 1, calcium sulfoaluminate and nano calcium carbonate are respectively pretreated according to the method of step 1 in embodiment 1;

[0050] 2. In parts by weight, 10 parts of pretreated anhydrous calcium sulfoaluminate (200 mesh), 20 parts of pretreated nano calcium carbonate, 40 parts of ultrafine perlite (particle size less than 100 μm), 40 parts of Ceramic fiber, 2 parts of magnesium aluminum silicate, 1.2 parts of polyvinyl butyral, and 3 parts of sodium pyrophosphate are mixed in a mixer, then add water and stir evenly, then add 0.18 parts of ferric chloride, and stir at room temperature for 1 hour. Formulated to obtain a density of 1.60g / cm 3 The leakage plugging slurry is in the form of an aqueous solution of a leakage plugging agent.

Embodiment 3

[0052] The present embodiment provides a leakage blocking agent, and the preparation method of the leakage blocking agent is as follows:

[0053] 1. Calcium sulfoaluminate and dicalcium silicate are respectively pretreated according to the method of step 1 in Example 1;

[0054] 2. In parts by weight, combine 10 parts of pretreated anhydrous calcium sulfoaluminate (200 mesh), 20 parts of pretreated dicalcium silicate, 40 parts of diatomaceous earth, 30 parts of ceramic fibers, 3 parts of polymer Acrylamide, 1.8 parts of polyvinyl butyral, and 5 parts of boric acid are mixed in a mixer, then add water and stir evenly, then add 0.3 parts of ferric chloride, and stir and react at room temperature for 1 hour to obtain a density of 1.85g / cm 3 The leakage plugging slurry is in the form of an aqueous solution of a leakage plugging agent.

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Abstract

The invention provides a pressure response type consolidation plugging agent as well as a preparation method and application thereof. The plugging agent comprises a curing agent, a filter aid, a suspending agent, a flexibilizer, a retarder and an activator. The invention also provides a preparation method of the plugging agent, which comprises the following steps: mixing the curing agent with the filter aid, the suspending agent, the flexibilizer and the retarder, and adding the activator to obtain the plugging agent. The invention also provides application of the plugging agent in leakage treatment of carbonate oil and gas reservoirs. The plugging agent can quickly respond to the change of environmental pressure to realize pressure-controlled consolidation; the plugging pressure bearing capacity can reach 20 MPa or above under the condition of 180 DEG C, the pressure bearing capacity of a formed acid-soluble consolidation slug can reach 10 MPa or above at the temperature of 200 DEG C and is stabilized for 15 d or above, the adaptive crack width reaches 10 mm, the acid solubility reaches 93% or above, reservoir cracks and holes under a complex pressure system can be effectively plugged, and the plugging agent is suitable for rapid leakage treatment of ultra-deep complex carbonate oil and gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of lost circulation agents used in oil or natural gas drilling, in particular to a pressure-responsive consolidated lost circulation agent and a preparation method and application thereof. Background technique [0002] With the continuous development of oil and gas exploration and development into deep and ultra-deep layers, drilling engineering is faced with more severe geological conditions and many technical bottlenecks, especially the loss of circulation in carbonate reservoirs under complex pressure systems has become the most important drilling technology. The primary engineering technical problem. Ultra-deep carbonate reservoirs have complex reservoir types, well-developed natural fractures, strong reservoir heterogeneity, complex formation pressure system, narrow safety density window, frequent lost circulation, loss of a large amount of non-productive time, and serious consequences. Economic losses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C04B28/06
CPCC09K8/426C04B28/065C09K2208/10C09K2208/08C04B2111/00724C04B7/00C04B14/08C04B14/4656C04B24/2652C04B24/2635C04B22/16C04B22/12C04B12/00C04B14/18C04B22/00C04B22/0093Y02W30/91
Inventor 李龙冯杰
Owner BC P INC CHINA NAT PETROLEUM CORP
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