Device and method for simulating hydrate decomposition induced by invasion of drilling fluid into reservoir

A technology of drilling fluid invasion and hydrate decomposition, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., and can solve the problems that cannot be obtained through quantitative analysis

Pending Publication Date: 2021-01-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to weaken the hydrate decomposition caused by drilling fluid invasion, low-temperature drilling fluid system is usually used in the process of hydrate drilling, but the existing research has not quantitatively analyzed the drilling fluid invasion temperature, drilling fluid invasion amount an

Method used

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  • Device and method for simulating hydrate decomposition induced by invasion of drilling fluid into reservoir
  • Device and method for simulating hydrate decomposition induced by invasion of drilling fluid into reservoir

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Embodiment 1

[0057] Such as figure 1 with figure 2 As shown, the experimental device for simulating drilling fluid intrusion into the reservoir to induce hydrate decomposition described in the embodiment of the present invention includes a high-pressure reactor 34 for the reaction between drilling fluid and natural gas to form hydrate, and a temperature environment for simulating the hydrate reservoir. Constant temperature fluid circulation pump 23, fully transparent water bath 36 and coolant circulation pump 35 provide high and low temperature constant temperature air bath box 21 simulating drilling fluid temperature environment, as well as drilling fluid invasion system, gas control system, back pressure unloading system and data Acquisition system, wherein: the autoclave 34 is placed in the fully transparent water bath 36, and the first (two) transparent windows 32 are installed on both sides of the autoclave 34, wherein the first transparent window is the main observation window, and ...

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Abstract

The invention provides a device and a method for simulating hydrate decomposition induced by invasion of drilling fluid into a reservoir. The device comprises a high-pressure reaction kettle (34), a high-low-temperature water bath temperature control system (102), a high-low-temperature constant-temperature air bath box (21), a drilling fluid pumping system (104), a gas control system (105), a back-pressure unloading system (106) and a data acquisition system (107), wherein the reaction kettle is arranged in the high-low-temperature constant-temperature air bath box, a reaction temperature ofthe reaction kettle and a gas temperature in the gas control system are respectively controlled by the high-low-temperature water bath temperature control system, and the drilling fluid pumping systemis connected to the reaction kettle through a pipeline, the back-pressure unloading system and the gas control system communicate with the interior of the reaction kettle through pipelines and air inlet/outlet holes (10) formed in the upper part of the reaction kettle, and the back-pressure unloading system is used for separately controlling the pressure balance of the reaction kettle, the gas control system and the outside.

Description

technical field [0001] The invention relates to the field of natural gas exploration and development, in particular, the invention relates to a device and method for simulating drilling fluid intrusion into a reservoir to induce hydrate decomposition. Background technique [0002] Natural gas hydrate is an ice-like crystalline compound formed by water molecules and hydrocarbon gas molecules under low temperature and high pressure conditions. It is also called "combustible ice" or "solid gas". It has the characteristics of high energy density, wide distribution, and large reserves. , is a new and alternative energy source with great potential. [0003] Gas hydrates are widely distributed in permafrost and ocean areas, and the stored natural gas far exceeds the known natural gas reserves. Exploration and development of natural gas hydrates is inseparable from drilling, and in order to ensure that hydrates in the reservoir will not decompose in large quantities during drilling...

Claims

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Application Information

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IPC IPC(8): E21B43/01E21B47/00E21B47/06E21B47/10E21B47/07
CPCE21B43/01E21B47/00E21B47/06E21B47/10
Inventor 王韧孙慧翠徐显广王建华张志磊赖晓晴张玮
Owner BC P INC CHINA NAT PETROLEUM CORP
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