Plugging agent system for permanently plugging multilayer low-pressure large-tunnel oil reservoir and technology using the same

A process technology, permanent technology, applied in the direction of sealing/isolation, drilling composition, wellbore/well components, etc., it can solve the problems of multiple intervals, high construction cost, and failure to meet the needs of oilfield development, etc.

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the characteristics and plugging difficulties of this type of oil reservoir are as follows: first, there are many intervals, large spans, and large differences between layers;
[0004] At present, conventional methods are used to block such oil layers, and the plugging can only be successful after repeated plugging (average 5 times, up to 7 times), the construction period is long (167 days), and the construction cost is high (1 million yuan), which cannot meet the needs of oil field development. needs

Method used

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  • Plugging agent system for permanently plugging multilayer low-pressure large-tunnel oil reservoir and technology using the same
  • Plugging agent system for permanently plugging multilayer low-pressure large-tunnel oil reservoir and technology using the same
  • Plugging agent system for permanently plugging multilayer low-pressure large-tunnel oil reservoir and technology using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Example 1: Shuang406 well plugging

[0086] 1. Basic situation: The well requires plugging of the 1615.0-1687.0m well section (8 intervals), with a span of 72m and a water absorption of 0.8m under 5MPa pump pressure 3 / min, the formation pressure is 10.73MPa, the total pressure drop is 5.26MPa, and the pressure maintenance level is 67.0%. The physical properties are detailed in Table 1 below.

[0087] Table 1 Physical properties of the plugging target formation in Well Shuang406

[0088]

[0089] 2. Implementation status:

[0090] 1. See the following table 2 for the formula of pre-blocking agent:

[0091] Table 2 Pre-blocking slug formula and dosage schedule

[0092]

[0093] 2. The amount of coagulant and isolated water:

[0094] Calcium chloride solution with a specific gravity of 1.3 30m 3 , isolated from clean water 5m 3 ;

[0095] 3. Dosage of plugging agent and replacement water:

[0096] Grade G medium-resistant oil well cement slurry with a specif...

Embodiment 2

[0108] Example 2: Plugging with new T4-2122

[0109] 1. Basic situation: The well requires plugging of the 942.2-959.6m well section (5 intervals), the formation pressure is 8.39MPa, and the water absorption is 460L / min under the pump pressure of 10MPa. The physical properties are shown in Table 3 below:

[0110] Physical property data of plugging target formation in Well Xin T4-2122 under Table 3

[0111]

[0112] 2. Implementation status:

[0113] 1. See the following table 4 for the formula of pre-blocking agent:

[0114] Table 4 Pre-blocking slug formula and dosage schedule

[0115]

[0116] 2. The amount of coagulant and isolated water:

[0117] Calcium chloride solution with a specific gravity of 1.3 30m 3 , isolated from clean water 5m 3 ;

[0118] 3. Dosage of plugging agent and replacement water:

[0119] YH-02 channeling and leakage plugging agent with a specific gravity of 1.55-1.6 30m 3 (blocking radius 2m), replace clean water 15.9m 3 , The formulat...

Embodiment 3

[0133] Example 3: Lower T3-212 plugging

[0134]1. Basic overview:

[0135] The well is due to H2Ⅰ3 3-4.5.6 There are large pores in the lower layer, which lead to steam channeling from the Lower T4-2114 Well which is 101m away from the southwest and the Lower T4-2116 Well which is 56m away from the northwest. In order to ensure the steam injection effect of the Lower T4-2114 and Lower T4-2116 wells, Request to block T3-212H2Ⅰ3 3-4.5.6 layer. In the preliminary extrusion test, the maximum pressure is 4.5MPa, and the water absorption is 520L / min. The physical properties are shown in Table 6 below:

[0136] Table 6 Physical properties of the plugging target layer in Well T3-212

[0137]

[0138] 2. Implementation status:

[0139] 1. The formula of pre-blocking agent is shown in the following table 7:

[0140] Table 7 Pre-blocking slug formula and dosage schedule

[0141]

[0142] 2. Coagulant and isolated water:

[0143] Calcium chloride solution with a specific gr...

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Abstract

The invention discloses a plugging agent system for permanently plugging a multilayer low-pressure large-tunnel oil reservoir and a technology using the same, and belongs to the technical field of oil field exploitation. The plugging agent system is a pre-plugging agent-plugging agent combined plugging system. The pre-plugging agent is used for pre-plugging a desired layer so that a liquid absorption section in an oil reservoir vertical direction is improved, a high permeability zone on the plane is plugged and it is guaranteed that the later plugging agent uniformly enters into all oil reservoirs. Through matching with a coagulation accelerator, the plugging agent squeezed into the oil reservoir is fast thickened, is fast stacked and stayed around a shaft and is cured to effectively plug the oil reservoir. Through the pre-plugging-coagulation accelerator coagulating-plugging agent sweeping plugging technology, the technical problem of a low success rate of multilayer low-pressure large-tunnel oil reservoir plugging is solved and the plugging process is finished by one step. Compared with the sectionalized plugging technology, the technology provided by the invention can effectively reduce plugging frequency and greatly reduce a construction cost.

Description

technical field [0001] The invention specifically relates to a plugging agent system and technology for permanently plugging multi-layer low-pressure large-pore oil layers, and belongs to the technical field of oil field exploitation. Background technique [0002] The oilfield has entered the later stage of development. Due to the impact of long-term scouring by injected water and measures such as oil layer reformation, some cements and rock skeletons in the oil layer are dissolved, and interstitial materials are washed away, making the pore characteristics move toward large pores, coarse channels, high The direction of sorting changes, eventually leading to the formation of large pores in the oil layer. When multiple oil layers are exploited in a set of strata, due to the serious shortage of the formation and the aggravation of the difference between layers, it will lead to the formation of multi-layer low-pressure large-pore oil layers. [0003] In the process of oilfield...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46C09K8/42E21B33/13
CPCC09K8/426C09K8/46E21B33/13
Inventor 秦世群桑涛王艳丽倪明镜胡士章
Owner CHINA PETROLEUM & CHEM CORP
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