CN-117404070-B - Method, device and equipment for judging connectivity of single vertical well and horizontal well in well group

CN117404070BCN 117404070 BCN117404070 BCN 117404070BCN-117404070-B

Abstract

The invention discloses a method, a device and equipment for judging connectivity of a single vertical well and a horizontal well in a well group. And determining the communication coefficient between the single vertical well and the horizontal well in the well group by determining weights corresponding to the response degrees of the underground temperature, the daily liquid yield and the wellhead oil pressure of the horizontal well in the well group and acquiring the underground temperature, the daily liquid yield and the wellhead oil pressure change range of the single vertical well in the well group before and after well shut-in of the single vertical well, and accurately determining the connectivity between each single vertical well and the horizontal well in the well group by using the communication coefficient. In addition, the method is further provided for carrying out intensity division on the connectivity between the single vertical well and the horizontal well according to the communication coefficient, and a connectivity improvement measure for the strong communication and the connectivity-free single vertical well and the horizontal well is made, so that a relatively balanced communication relationship is established between a plurality of vertical wells and the horizontal well, the purposes of balanced displacement and oil drainage are achieved, and good injection and production effects and excellent economic benefits of well groups are ensured.

Inventors

ZHANG LIWEI
GUO WENXUAN
CHEN SEN
YOU HONGJUAN
PAN JINGJUN
LI JIE
ZHENG AIPING
HUANG YONG
XIANG HONG
LIU HUAN

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20220708

Claims (16)

1. A method for determining connectivity of a single vertical well and a horizontal well in a well group, the method comprising: determining weights corresponding to the response degrees of three parameters of the downhole temperature, the daily liquid yield and the wellhead oil pressure of the horizontal well in the well group production process; Acquiring the underground temperature, daily liquid production and wellhead oil pressure change range of the horizontal well before and after the shut-in of a single vertical well in the well group; Determining a communication coefficient between the single vertical well and the horizontal well according to weights corresponding to the response degrees of the underground temperature, the daily liquid yield and the wellhead oil pressure of the horizontal well in the well group production process and the obtained change range of the underground temperature, the daily liquid yield and the wellhead oil pressure of the horizontal well before and after the single vertical well is shut in; The method comprises the steps of determining a communication coefficient between a single vertical well and the horizontal well according to the weight corresponding to the response degree of the underground temperature, daily liquid yield and wellhead oil pressure of the horizontal well in the well group production process and the obtained change range of the underground temperature, daily liquid yield and wellhead oil pressure of the horizontal well before and after well closing of the single vertical well, wherein the communication coefficient is determined by the following formula: ; Wherein C is a communication coefficient between a single vertical well and a horizontal well, alpha is a weight corresponding to the downhole temperature response degree of the horizontal well, beta is a weight corresponding to the daily fluid production amount of the horizontal well, gamma is a weight corresponding to the wellhead oil pressure of the horizontal well, T 1 is the downhole temperature of the horizontal well before the single vertical well is shut in, T 0 is the downhole temperature of the horizontal well after the single vertical well is shut in, Q 1 is the daily fluid production amount of the horizontal well before the single vertical well is shut in, Q 0 is the daily fluid production amount of the horizontal well after the single vertical well is shut in, P 1 is the wellhead oil pressure of the horizontal well before the single vertical well is shut in, and P 0 is the wellhead oil pressure of the horizontal well after the single vertical well is shut in; And judging the connectivity of the single vertical well and the horizontal well in the well group according to the determined communication coefficient between the single vertical well and the horizontal well.
2. The method for determining connectivity between a single vertical well and a horizontal well in a well group according to claim 1, wherein determining connectivity between a single vertical well and a horizontal well in a well group according to the determined connectivity coefficient between the single vertical well and the horizontal well specifically comprises: The larger the communication coefficient between the determined single vertical well and the horizontal well is, the stronger the connectivity between the single vertical well and the horizontal well is.
3. The method for determining connectivity between a single vertical well and a horizontal well in a well group according to claim 1, wherein, The well group is a multi-vertical well-single horizontal well group.
4. The method for determining connectivity between a single vertical well and a horizontal well in a well group according to claim 1, wherein the step of obtaining the downhole temperature, daily liquid production and wellhead oil pressure variation range of the horizontal well before and after well shut-in of the single vertical well in the well group comprises the steps of: Selecting a plurality of vertical wells in the well group, and continuously injecting steam for 5-10 days at the same time; Sequentially closing single vertical wells one by one from the selected multiple vertical wells in a direction from the toe of the horizontal well to the heel of the horizontal well, and collecting three production parameters of liquid production, downhole temperature and wellhead oil pressure of each single vertical well before and after well closing, wherein the liquid production is carried out on the horizontal well before well closing and within 5-10 days of well closing; And determining the underground temperature, daily liquid production and wellhead oil pressure change range of the horizontal well before and after the single vertical well is shut in according to the collected three production parameters of liquid production, underground temperature and wellhead oil pressure of the horizontal well before and after the well is shut in and within 5-10 days of well shut-in.
5. The method for determining connectivity between a single vertical well and a horizontal well in a well group according to claim 4, wherein selecting a plurality of vertical wells in the well group to simultaneously and continuously inject steam for 5-10 days comprises: And (3) selecting a plurality of vertical wells at the two sides of the horizontal well in a crossing way and simultaneously continuously injecting steam for 5-10 days, wherein two vertical wells adjacent to the horizontal well in the vertical direction along the horizontal well direction are not existed in the plurality of vertical wells selected in the crossing way.
6. The method for determining connectivity between a single vertical well and a horizontal well in a well group according to claim 5, wherein selecting a plurality of vertical wells in the well group to simultaneously and continuously inject steam for 5-10 days comprises: And selecting the rest of the plurality of vertical wells which are arranged in a crossing way from two sides of the horizontal well, and simultaneously injecting steam continuously for 5-10 days, wherein two vertical wells which are adjacent to each other in the horizontal well direction and the vertical direction of the horizontal well do not exist in the rest of the plurality of vertical wells which are arranged in a crossing way.
7. The method for determining connectivity of a single vertical well and a horizontal well in a well group according to claim 1, wherein the method further comprises: And carrying out three-level intensity division on connectivity between the single vertical well and the horizontal well according to the determined communication coefficient between the single vertical well and the horizontal well, wherein the three-level intensity division comprises the following steps: When 0< connectivity coefficient <1/3C, dividing into no connectivity; When the communication coefficient is less than or equal to 1/3 and less than or equal to 2/3C, medium communication is divided; when 2/3C < connectivity coefficient is less than or equal to C, the strong connectivity is divided.
8. The method of determining single vertical and horizontal well connectivity in a well group of claim 7, wherein the method further comprises: According to the intensity dividing result, making connectivity improvement measures for the strong communication and the single vertical well without communication and the horizontal well, wherein, The improvement measure between the single vertical well and the horizontal well which are strongly communicated is to develop a plugging measure; an improvement measure between a single vertical well and a horizontal well without communication is to develop reservoir transformation; Re-determining the connectivity strength grade between the single vertical well and the horizontal well for the single vertical well subjected to the connectivity improvement measure until the single vertical well is moderately communicated with the horizontal well; the re-determining the connectivity strength level between the single vertical well and the horizontal well comprises the steps of: Closing all single vertical wells except for the connectivity improvement measures; injecting steam into the single vertical well after the connectivity improvement measure for 5-10 days, and closing the well; determining the communication coefficient of the single vertical well after the connectivity improvement measure; and redetermining the connectivity strength grade between the single vertical well and the horizontal well according to the communication coefficient.
9. A single vertical well and horizontal well connectivity determination apparatus in a well group, the apparatus comprising: The first determining unit is used for determining weights corresponding to the response degrees of the underground temperature, the daily liquid production amount and the wellhead oil pressure of the horizontal well in the well group production process; The acquisition unit is used for acquiring the underground temperature, daily liquid production and wellhead oil pressure change range of the horizontal well before and after the single vertical well in the well group is shut in; The second determining unit is used for determining a communication coefficient between the single vertical well and the horizontal well according to weights corresponding to the response degrees of the underground temperature, the daily liquid yield and the wellhead oil pressure of the horizontal well in the well group production process and the obtained change ranges of the underground temperature, the daily liquid yield and the wellhead oil pressure of the horizontal well before and after the single vertical well is shut in; The second determining unit determines a communication coefficient between the single vertical well and the horizontal well according to weights corresponding to response degrees of three parameters of the underground temperature, the daily liquid yield and the wellhead oil pressure of the horizontal well in the well group production process and obtained change ranges of the underground temperature, the daily liquid yield and the wellhead oil pressure of the horizontal well before and after well closing of the single vertical well, and the communication coefficient between the single vertical well and the horizontal well is determined according to the following formula: ; Wherein C is a communication coefficient between a single vertical well and a horizontal well, alpha is a weight corresponding to the downhole temperature response degree of the horizontal well, beta is a weight corresponding to the daily fluid production of the horizontal well, gamma is a weight corresponding to the wellhead oil pressure of the horizontal well, T 1 is the downhole temperature of the horizontal well before the single vertical well is shut in, T 0 is the downhole temperature of the horizontal well after the single vertical well is shut in, Q 1 is the daily fluid production of the horizontal well before the single vertical well is shut in, Q 0 is the daily fluid production of the horizontal well after the single vertical well is shut in, P 1 is the wellhead oil pressure of the horizontal well before the single vertical well is shut in, and P 0 is the wellhead oil pressure of the horizontal well after the single vertical well is shut in; And the judging unit is used for judging the connectivity between the single vertical well and the horizontal well in the well group according to the determined communication coefficient between the single vertical well and the horizontal well.
10. The device for determining connectivity between a single vertical well and a horizontal well in a well group according to claim 9, wherein the determining unit determines the connectivity between the single vertical well and the horizontal well in the well group specifically as: The larger the communication coefficient between the determined single vertical well and the horizontal well is, the stronger the connectivity between the single vertical well and the horizontal well is.
11. The apparatus for determining connectivity between a single vertical well and a horizontal well in a well group as claimed in claim 9, wherein, The well group is a multi-vertical well-single horizontal well group.
12. The single vertical well and horizontal well connectivity determination apparatus in a well group according to claim 9, wherein the acquisition unit acquires a downhole temperature, a daily liquid production amount, and a wellhead oil pressure variation range of the horizontal well before and after the single vertical well in the well group is shut in, comprising the steps of: Selecting a plurality of vertical wells in the well group, and continuously injecting steam for 5-10 days at the same time; Sequentially closing single vertical wells one by one from the selected multiple vertical wells in a direction from the toe of the horizontal well to the heel of the horizontal well, and collecting three production parameters of liquid production, downhole temperature and wellhead oil pressure of each single vertical well before and after well closing, wherein the liquid production is carried out on the horizontal well before well closing and within 5-10 days of well closing; And determining the underground temperature, daily liquid production and wellhead oil pressure change range of the horizontal well before and after the single vertical well is shut in according to the collected three production parameters of liquid production, underground temperature and wellhead oil pressure of the horizontal well before and after the well is shut in and within 5-10 days of well shut-in.
13. The single vertical well and horizontal well connectivity determination apparatus in a well group according to claim 12, wherein the selecting, by the obtaining unit, a plurality of vertical wells in the well group to simultaneously and continuously inject steam for 5-10 days comprises: And (3) selecting a plurality of vertical wells at the two sides of the horizontal well in a crossing way and simultaneously continuously injecting steam for 5-10 days, wherein two vertical wells adjacent to the horizontal well in the vertical direction along the horizontal well direction are not existed in the plurality of vertical wells selected in the crossing way.
14. The single vertical well and horizontal well connectivity determination apparatus in a well group according to claim 13, wherein the selecting, by the obtaining unit, a plurality of vertical wells in the well group to simultaneously and continuously inject steam for 5-10 days comprises: And selecting the rest of the plurality of vertical wells which are arranged in a crossing way from two sides of the horizontal well, and simultaneously injecting steam continuously for 5-10 days, wherein two vertical wells which are adjacent to each other in the horizontal well direction and the vertical direction of the horizontal well do not exist in the rest of the plurality of vertical wells which are arranged in a crossing way.
15. The single vertical well and horizontal well connectivity determination apparatus in a well group of claim 9, wherein the apparatus further comprises: the intensity dividing unit is used for carrying out three-level intensity division on the connectivity between the single vertical well and the horizontal well according to the determined communication coefficient between the single vertical well and the horizontal well, wherein the three-level intensity division comprises no communication when the communication coefficient is 0< 1/3C, medium communication when the communication coefficient is less than or equal to 1/3C and less than or equal to 2/3C, and strong communication when the communication coefficient is less than or equal to 2/3C; The intensity dividing unit is also used for making connectivity improvement measures for the single vertical well and the horizontal well which are in strong communication and are not in communication according to the intensity dividing result, and redefining the connectivity intensity level between the single vertical well and the horizontal well for the single vertical well after the connectivity improvement measures until the single vertical well and the horizontal well are in medium communication.
16. A connectivity judging device for a single vertical well and a horizontal well in a well group comprises a processor and a memory, wherein, The memory is used for storing machine executable instructions; the processor is configured to read and execute the machine executable instructions stored in the memory to implement the method according to any one of claims 1 to 8.

Description

Method, device and equipment for judging connectivity of single vertical well and horizontal well in well group Technical Field The invention relates to the technical field of heavy oil reservoir exploitation, in particular to a method, a device and equipment for judging connectivity of a single vertical well and a horizontal well in a well group. Background The Chinese thickened oil resources are rich and mainly distributed in the fields of Xinjiang, liaohe, victory and the like, the main body adopts a steam huff-puff mode for development, the overall extraction degree is low, the ordinary thickened oil and extra-super thickened oil development of the Xinjiang oilfield is taken as an example, the yield in the later stage of steam huff-puff is fast in decrease, the water content is high, the oil-gas ratio is low, the extraction degree is only 20-30%, the residual resource amount is large, and the final recovery ratio is improved by exploring and taking over the development technology. In recent years, oil fields such as Xinjiang and Liaohe are encrypted among straight wells of original steam, so that a vertical well-horizontal well combined flooding development (VHSD) technology is formed to take over and develop a thick oil aged oil reservoir, the VHSD development process is divided into two stages of a huff preheating stage and a flooding and flooding compound stage, the straight wells and the horizontal wells are huff and puff simultaneously, steam sweep radius is gradually enlarged, after the preheating is established and communicated, the method is transferred into a flooding and flooding compound development mode of steam injection of a plurality of straight wells and oil extraction of the horizontal wells, and by the method, residual oil among wells can be effectively used, so that the recovery ratio is further greatly improved. The VHSD succession development test is started in a thick oil old region in 2015 of Xinjiang oil field, hundreds of wells are accumulatively implemented at present, because of the problems of old region interval layer spreading, steam channeling channel development, low formation pressure coefficient and the like, the connectivity establishment difference in the huff-puff preheating stage is large, the vertical well-horizontal well injection and production correspondence relationship is poor during the transfer-drive-release composite development, strong communication is formed by partial steam channeling of the wells, the communication is not established in one injection, steam is not injected in part of the wells, the technical key of VHSD development is to establish the balanced communication relationship of a plurality of vertical well-1 horizontal wells to form an effective displacement and oil release mode, and therefore, the method is an important basis for scientifically judging the thermal connectivity and the communication strength between a plurality of VHSD vertical wells and the horizontal well injection and production wells, and obtaining the balanced development of a drive-release composite development effect of a VHSD steam cavity. The relevant research on VHSD vertical well-horizontal well connectivity at the present stage mainly depends on a numerical simulation method by searching scientific and technological literature and patents published at home and abroad, steam sweep radius of the vertical well and horizontal well throughput process is simulated by considering reservoir basic physical properties (porosity, permeability and residual oil saturation) and development history data, and when crude oil has fluidity under the temperature field condition between the vertical well and the horizontal well, connectivity is considered to be established, and at present, xinjiang oil fields usually take 2-3 rounds of huff and puff, namely, the oil is transferred into the steam injection stage of the vertical well and the drainage oil extraction stage of the horizontal well, but the connectivity of each vertical well and the horizontal well is greatly influenced by factors such as high permeability channeling channels caused by reservoir heterogeneity and early steam huff, so the connectivity judgment result obtained by the numerical modeling method is low in reliability and seriously deviates from the field reality. For example, reasonable rotation and driving time determined by VHSD numerical simulation of nine 8 areas of Xinjiang oil fields is 2-3 cycles of simultaneous throughput of a vertical well and a horizontal well, and in the actual production process of the site, rotation and driving are combined after 3 cycles of simultaneous throughput of the vertical well and the horizontal well, so that the production shows serious steam channeling of part of well groups, namely, one injection is just channeling, and part of well group production is not responded, and steam is not injected in an invalid way, thereby seriously affecting the development effect and econo