While-drilling barrel rock debris and gas logging sample collecting device

Abstract

The invention discloses a while-drilling barrel rock debris and gas logging sample collecting device. The while-drilling barrel rock debris and gas logging sample collecting device comprises a liquid-sand separation system, a rock debris collecting system and a gas logging sample collecting system. The liquid-sand separation system is used for separating while-drilling well drilling fluid into drilling fluid liquid and rock debris and respectively conveying the drilling fluid liquid and the rock debris to the gas logging sample collection system and the rock debris collection system, and rock debris samples are collected through the rock debris collection system; the gas logging sample collection system comprises a quantitative metering mechanism and a degassing mechanism, and the quantitative metering mechanism quantitatively conveys the drilling fluid to the degassing mechanism; the degassing mechanism comprises a heating mechanism and a vacuum stirring degassing mechanism, and the drilling fluid is degassed through the heating mechanism and the vacuum stirring degassing mechanism to obtain the gas logging sample; the problems that an electric degasser cannot conduct quantitative degassing, oil gas in the C6-C8 range in mud cannot be removed, and the timeliness of manual rock debris collection is poor are effectively solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of oil and gas well logging, and in particular to a rock cuttings and gas logging sample collection device for well logging. Background Art

[0002] Mud logging technology is a technology that directly obtains first-hand physical objects, data, images and other information at the drilling site and provides integrated geological engineering information services. With the vigorous development of unconventional oil and gas reservoirs such as shale oil and gas and tight oil and gas, higher technical requirements are placed on on-site mud logging technology.

[0003] Currently, gas sampling for mud logging involves degassing the mud by stirring it with an electric degasser. The degassing gas is then collected using a vacuum system and transported to an integrated mud logger for chromatographic monitoring. This problem is that only the C1-C5 hydrocarbon gas fraction in the mud is degassed, while components such as C6-C8 are not. Consequently, the mud logging conclusions miss important reservoir information. Furthermore, because the mud degassing process cannot achieve quantitative degassing, the integrated mud logger cannot perform quantitative analysis. Mud logging requires manual sampling of rock cuttings through the vibrating screen's sand outlet. This sampling process requires constant movement up and down the drilling fluid tank, which is dangerous and labor-intensive. Furthermore, manual sampling is time-consuming and inefficient. Furthermore, the electric degasser is typically installed at the drilling fluid outlet, requiring manual adjustment when the return flow rate of drilling fluid changes, which is time-consuming and labor-intensive. Summary of the Invention

[0004] In view of this, the present disclosure provides a device for collecting rock cuttings and gas logging samples while drilling, which solves the problems of electric degassers being unable to degas quantitatively, oil and gas in the C6-C8 range in mud being unable to be removed, and poor timeliness of manual rock cutting collection.

[0005] To solve the above technical problems, the present disclosure provides a technical solution, wherein the drilling wellbore cuttings and gas logging sample collection device comprises: Liquid sand separation system, rock cuttings collection system and gas logging sample collection system; The liquid sand separation system separates the drilling fluid into drilling fluid and rock cuttings, and transports the drilling fluid to the gas sampling collection system and the rock cutting collection system respectively, and the rock cuttings collection system collects rock cuttings samples; The gas testing sample collection system includes a quantitative metering mechanism and a degassing mechanism, wherein the quantitative metering mechanism quantitatively delivers the drilling fluid to the degassing mechanism; The degassing mechanism includes a heating mechanism and a vacuum stirring degassing mechanism, and the drilling fluid is degassed by the heating mechanism and the vacuum stirring degassing mechanism to obtain the gas testing sample.

[0006] In the present disclosure and possible embodiments, the liquid sand separation system includes: An inlet pump and a cyclone desander; the inlet pump pumps the drilling fluid while drilling the wellbore to the cyclone desander, and the cyclone desander centrifugally separates the drilling fluid while drilling the wellbore into the drilling fluid liquid and the rock cuttings.

[0007] In the present disclosure and possible embodiments, the quantitative metering mechanism includes: Dosing pump and pressure regulating system; The liquid outlet of the cyclone desander is connected to the metering pump and the pressure regulating system through pipelines; the pressure regulating system includes a pressure regulating valve and an outlet pump connected in series.

[0008] In the present disclosure and possible embodiments, the heating mechanism includes: A heater is provided, wherein the metering pump pipeline is connected to the heater.

[0009] In the present disclosure and possible embodiments, the vacuum stirring and degassing mechanism includes: A stirring degasser and a vacuum pump; the stirring degasser is connected to the heater and the vacuum pump through pipelines respectively; A gas sampling port is provided on the vacuum pump pipeline, and the gas sampling port pipeline is connected to a comprehensive mud logging instrument.

[0010] In the present disclosure and possible embodiments, the agitator degasser pipeline is connected to a drilling fluid buffer tank, and the drilling fluid buffer tank pipeline is connected to the outlet pump.

[0011] In the present disclosure and possible embodiments, the rock cuttings collection system includes: The rotating sand disc is provided with a sand container, and the sand discharge port of the cyclone desander corresponds to the sand container.

[0012] In the present disclosure and possible embodiments, a liquid outlet is provided at the bottom of the sand container, a liquid container is arranged below the sand container, and a pipeline of the liquid container is connected to the outlet pump.

[0013] The present disclosure has the following beneficial effects: The disclosed device for collecting wellbore cuttings and gas logging samples while drilling enables the complete separation of most C1-C8 hydrocarbon gases from the drilling fluid through the triple effects of stirring, vacuum, and heating, thereby significantly improving the sensitivity and accuracy of gas logging. Furthermore, quantitative metering of the drilling fluid by a metering pump enables quantitative degassing of the drilling fluid and quantitative collection by the integrated mud logger. The combined effects of these two aspects effectively improve the sensitivity, accuracy, and authenticity of gas logging. Furthermore, the device system can operate automatically and continuously, effectively resolving issues such as the poor timeliness of manual cuttings collection and reducing the safety risks and labor intensity of on-site mud logging and sand bailing personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which: Figure 1 Schematic diagram of a device for collecting wellbore cuttings and gas logging samples while drilling according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0015] The present disclosure is described below based on embodiments, but it is worth noting that the present disclosure is not limited to these embodiments. In the detailed description of the present disclosure below, some specific details are described in detail. However, for the parts not described in detail, those skilled in the art can also fully understand the present disclosure.

[0016] At the same time, unless the context clearly requires otherwise, words such as "include", "comprising" and the like throughout the specification and claims should be interpreted as inclusive rather than exclusive or exhaustive; that is, as "including but not limited to".

[0017] The design concept of the drilling wellbore cuttings and gas logging sample collection device of the present invention is: The device is equipped with a liquid sand separation system, a rock cuttings collection system and a gas logging sample collection system. The liquid sand separation system uses centrifugal force to centrifugally separate the drilling fluid while drilling the wellbore into drilling fluid liquid without rock cuttings and rock cuttings.

[0018] The drilling fluid, free of cuttings, enters the gas sampling system, which uses a metering pump to quantitatively meter and heat the drilling fluid. The heated drilling fluid is then degassed through agitation and simultaneously pumped under negative pressure. This triple effect of heating, negative pressure, and agitation fully removes C1-C8 hydrocarbons from the drilling fluid. The gas removed from the drilling fluid is then pumped by a vacuum pump and fed into the integrated mud logger as a gas sampling sample for chromatographic analysis. Meanwhile, the centrifuged cuttings enter the cuttings collection system, where sand samples are collected.

[0019] Therefore, the collection device of the present invention can collect rock cutting samples and gas logging samples at the same time. Because the drilling fluid has been heated and vacuumed, hydrocarbons in the C6 to C8 range in the drilling fluid that are in a liquid state can also be fully removed. In addition, the quantitative measurement of the drilling fluid by the quantitative pump realizes quantitative degassing of the drilling fluid and quantitative collection of the integrated mud logging instrument. Through the combined effect of the above two aspects, the sensitivity, accuracy and authenticity of the gas logging are greatly increased, thereby improving the probability of discovering oil and gas reservoirs.

[0020] Based on the above technical concept, the present disclosure provides specific technical solutions through embodiments. Figure 1Schematic diagram of the device for collecting rock cuttings and gas logging samples while drilling according to the embodiment of the present disclosure; Figure 1 As shown: the drilling wellbore cuttings and gas logging sample collection device includes an inlet pump 1, a cyclone desander 2, a dosing pump 3, a heater 4, a stirring degasser 5, a gas sampling port 6, a vacuum pump 7, a drilling fluid buffer tank 8, an outlet pump 9, a rotating sand tray 10 and a pressure regulating valve 11; wherein, the inlet pump 1 pipeline is connected to the cyclone desander 2, and the liquid outlet of the cyclone desander 2 is respectively connected to the dosing pump 3 and the pressure regulating system through pipelines, and the pressure regulating system consists of a pressure regulating valve 11 and an outlet pump 9 connected in series; the outlet pipeline of the dosing pump 3 is connected to the heater 4, and the heater 4 The outlet pipeline is connected to the stirring degasser 5, the stirring degasser 5 pipeline is connected to the vacuum pump 7, the vacuum pump 7 pipeline is provided with a gas sampling port 6, and the gas sampling port 6 pipeline is connected to the integrated logging instrument; the stirring degasser 5 is also connected to the drilling fluid buffer tank 8 by a pipeline, and the drilling fluid buffer tank 8 pipeline is connected to the outlet pump 9; the sand outlet of the cyclone desander 2 corresponds to the sand container of the rotating sand tray 10, the bottom of the sand container is provided with a liquid outlet, and a liquid container is arranged below the sand container. The liquid container pipeline is connected to the outlet pump 9, and the outlet pipeline of the outlet pump 9 is the drilling fluid outlet.

[0021] For the drilling wellbore rock cuttings and gas logging sample collection device of the present invention, the inlet pump 1 and the cyclone desander 2 constitute the liquid sand separation system; the dosing pump 3, the heater 4, the stirring degasser 5, the gas sampling port 6, the vacuum pump 7, the drilling fluid buffer tank 8, the outlet pump 9 and the pressure regulating valve 11 constitute the gas logging sample collection system; the outlet pump 9 and the rotating sand disc 10 constitute the rock cuttings collection system.

[0022] Specifically, the acquisition device and its workflow of this embodiment are described in detail. Figure 1 As shown, in the liquid sand separation system, the inlet pump 1 collects and pumps the drilling fluid from the wellbore between the wellhead and the shaker inlet to pressurize the wellbore, so that the drilling fluid from the wellbore enters the cyclone desander 2 at high speed.

[0023] exist Figure 1 The drilling fluid entering the cyclone desander 2 at high speed rotates at a high speed on the conical inner wall of the cyclone desander 2. Since the density of the drilling fluid and the cuttings in the drilling fluid are different, the centrifugal force generated by the rotation of the cyclone desander 2 separates the drilling fluid from the cuttings. The separated cuttings fall into the rotating sand tray 10 of the cuttings collection system through the sand discharge port at the bottom. The drilling fluid without cuttings after separation is discharged from the liquid outlet at the top to the gas logging sample collection system.

[0024] exist Figure 1In the figure, the rotating sand tray 10 is a circular rotating mechanism with several circular holes distributed around the circumference, such as 4 circular holes. The circular holes are used to place sand baskets. The sand baskets are placed just below the sand discharge port of the cyclone desander 2 by rotation. The sampling personnel take rock cuttings samples from the rotating sand tray 10. Part of the drilling fluid that falls with the rock cuttings passes through the mesh of the sand basket of the rotating sand tray 10 into the container below and is then pumped away by the outlet pump 9.

[0025] exist Figure 1 In the process, a portion of the drilling fluid discharged from the outlet of the cyclone desander 2 enters the metering pump 3, while the remaining portion flows through the pressure regulating valve 11 and the outlet pump 9 and returns to the drilling fluid outlet. The pressure regulating valve 11 maintains the internal pressure of the pipeline, ensuring the inlet drilling pressure of the metering pump 3. After being pressurized by the metering pump 3, the drilling fluid enters the heater 4 for heating to 80°C. At 80°C, hydrocarbons in the C6-C8 range in the drilling fluid can be converted from liquid to gas. The heated drilling fluid then enters the vacuum agitation degassing mechanism connected by a pipeline from the vacuum pump 7 to the agitation degasser 5.

[0026] exist Figure 1 In the embodiment, the top of the agitator degasser 5 is equipped with an electric motor to drive the agitator for agitation and degassing. The internal pressure of the agitator degasser 5 decreases under the action of the vacuum pump 7, and the internal pressure is less than atmospheric pressure. The combined effects of heating and negative pressure allow for a more thorough volatilization and separation of hydrocarbons from the drilling fluid than with existing electric degassers. Furthermore, since the drilling fluid is sampled by the dosing pump 3, the flow rate background value is fixed, thus achieving the purpose of quantitative degassing. Simultaneously, the vacuum pump 7 draws gas from the top of the agitator degasser 5 and delivers it to the integrated mud logger through the gas sampling port 6 for chromatographic monitoring. Furthermore, if the drilling fluid exceeds a certain height in the agitator degasser 5, it will automatically flow into the drilling fluid buffer tank 8 and be discharged to the drilling fluid outlet through the outlet pump 9.

[0027] It can be seen from the description of the working process of the above device that the device system operates automatically and continuously, and cooperates with the production of produced fluid in the wellbore while drilling. Preferably, the rotating sand disc 10 can be matched with the drilling fluid production time through the logging well depth tracking system, so that the rock cuttings sample and the well depth are kept in one-to-one correspondence, and the precise correspondence between the precise sample and the well depth is achieved, thereby effectively solving the problem of poor timeliness of manual collection of rock cuttings, and can effectively reduce the safety risks and labor intensity of on-site logging and sand dredging personnel.

[0028] In addition, in order to standardize management and facilitate work, the above-mentioned system can be designed to be installed in a positive pressure explosion-proof box to form a skid-mounted mechanism, thereby facilitating logging work at different wellheads; the box can be customized according to on-site needs, and a constant temperature and lighting system can be installed in the box, and the box is equipped with a sampling window.

[0029] The above-described embodiments are merely examples of implementation methods of the present disclosure, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art may make various modifications, equivalent substitutions, and improvements without departing from the scope of the present disclosure, and these modifications are all within the scope of protection of the present disclosure. Therefore, the scope of protection of the present invention shall be based on the appended claims.

Claims

1. A device for collecting rock cuttings and gas logging samples while drilling, characterized in that: include: Liquid sand separation system, rock cuttings collection system and gas logging sample collection system; The liquid sand separation system separates the drilling fluid into drilling fluid and rock cuttings, and transports the drilling fluid to the gas sampling collection system and the rock cutting collection system respectively, and the rock cuttings collection system collects rock cuttings samples; The gas testing sample collection system includes a quantitative metering mechanism and a degassing mechanism, wherein the quantitative metering mechanism quantitatively delivers the drilling fluid to the degassing mechanism; The degassing mechanism includes a heating mechanism and a vacuum stirring degassing mechanism, and the drilling fluid is degassed by the heating mechanism and the vacuum stirring degassing mechanism to obtain the gas testing sample.

2. The collection device according to claim 1, characterized in that: The liquid sand separation system comprises: An inlet pump (1) and a cyclone desander (2); the inlet pump (1) pumps the drilling fluid of the wellbore being drilled to the cyclone desander (2), and the cyclone desander (2) centrifugally separates the drilling fluid of the wellbore being drilled into the drilling fluid liquid and the rock cuttings.

3. The collection device according to claim 2, characterized in that: The quantitative metering mechanism includes: Dosing pump (3) and pressure regulating system; The liquid outlet of the cyclone desander (2) is connected to the metering pump (3) and the pressure regulating system via pipelines; the pressure regulating system comprises a pressure regulating valve (11) and an outlet pump (9) connected in series.

4. The collection device according to claim 3, characterized in that: The heating mechanism comprises: A heater (4) is provided, wherein the metering pump (3) is connected to the heater (4) via a pipeline.

5. The collection device according to claim 4, characterized in that: The vacuum stirring and degassing mechanism comprises: A stirring degasser (5) and a vacuum pump (7); the stirring degasser (5) is connected to the heater (4) and the vacuum pump (7) through pipelines respectively; A gas sampling port (6) is provided on the vacuum pump (7) pipeline, and the gas sampling port (6) pipeline is connected to a comprehensive mud logging instrument.

6. The collection device according to claim 5, characterized in that: The pipeline of the stirring degasser (5) is connected to the drilling fluid buffer tank (8), and the pipeline of the drilling fluid buffer tank (8) is connected to the outlet pump (9).

7. The collection device according to claim 6, characterized in that: The rock cuttings collection system comprises: A rotating sand disc (10) is provided with a sand container, and a sand discharge port of the cyclone desander (2) corresponds to the sand container.

8. The collection device according to claim 6, characterized in that: A liquid outlet is provided at the bottom of the sand container, a liquid container is arranged below the sand container, and a pipeline of the liquid container is connected to the outlet pump (9).

Images